Enable object body and metadata encryption

Adds encryption middlewares.

All object servers and proxy servers should be upgraded before
introducing encryption middleware.

Encryption middleware should be first introduced with the
encryption middleware disable_encryption option set to True.
Once all proxies have encryption middleware installed this
option may be set to False (the default).

Increases constraints.py:MAX_HEADER_COUNT by 4 to allow for
headers generated by encryption-related middleware.

Co-Authored-By: Tim Burke <tim.burke@gmail.com>
Co-Authored-By: Christian Cachin <cca@zurich.ibm.com>
Co-Authored-By: Mahati Chamarthy <mahati.chamarthy@gmail.com>
Co-Authored-By: Peter Chng <pchng@ca.ibm.com>
Co-Authored-By: Alistair Coles <alistair.coles@hpe.com>
Co-Authored-By: Jonathan Hinson <jlhinson@us.ibm.com>
Co-Authored-By: Hamdi Roumani <roumani@ca.ibm.com>

UpgradeImpact

Change-Id: Ie6db22697ceb1021baaa6bddcf8e41ae3acb5376

doc/source/middleware.rst

@@ -96,6 +96,15 @@ DLO support centers around a user specified filter that matches
 segments and concatenates them together in object listing order. Please see
 the DLO docs for :ref:`dlo-doc` further details.
 
+.. _encryption:
+
+Encryption
+==========
+
+.. automodule:: swift.common.middleware.crypto
+    :members:
+    :show-inheritance:
+
 .. _formpost:
 
 FormPost
@@ -108,7 +117,7 @@ FormPost
 .. _gatekeeper:
 
 GateKeeper
-=============
+==========
 
 .. automodule:: swift.common.middleware.gatekeeper
     :members:
@@ -123,6 +132,13 @@ Healthcheck
     :members:
     :show-inheritance:
 
+Keymaster
+=========
+
+.. automodule:: swift.common.middleware.crypto.keymaster
+    :members:
+    :show-inheritance:
+
 .. _keystoneauth:
 
 KeystoneAuth

etc/proxy-server.conf-sample

@@ -79,7 +79,7 @@ bind_port = 8080
 [pipeline:main]
 # This sample pipeline uses tempauth and is used for SAIO dev work and
 # testing. See below for a pipeline using keystone.
-pipeline = catch_errors gatekeeper healthcheck proxy-logging cache container_sync bulk tempurl ratelimit tempauth copy container-quotas account-quotas slo dlo versioned_writes proxy-logging proxy-server
+pipeline = catch_errors gatekeeper healthcheck proxy-logging cache container_sync bulk tempurl ratelimit tempauth copy container-quotas account-quotas slo dlo versioned_writes keymaster encryption proxy-logging proxy-server
 
 # The following pipeline shows keystone integration. Comment out the one
 # above and uncomment this one. Additional steps for integrating keystone are
@@ -765,3 +765,33 @@ use = egg:swift#copy
 # When object_post_as_copy is set to True, a POST request will be transformed
 # into a COPY request where source and destination objects are the same.
 # object_post_as_copy = true
+
+# Note: To enable encryption, add the following 2 dependent pieces of crypto
+# middleware to the proxy-server pipeline. They should be to the right of all
+# other middleware apart from the final proxy-logging middleware, and in the
+# order shown in this example:
+# <other middleware> keymaster encryption proxy-logging proxy-server
+[filter:keymaster]
+use = egg:swift#keymaster
+
+# Sets the root secret from which encryption keys are derived. This must be set
+# before first use to a value that is a base64 encoding of at least 32 bytes.
+# The security of all encrypted data critically depends on this key, therefore
+# it should be set to a high-entropy value. For example, a suitable value may
+# be obtained by base-64 encoding a 32 byte (or longer) value generated by a
+# cryptographically secure random number generator. Changing the root secret is
+# likely to result in data loss.
+# TODO - STOP SETTING THIS DEFAULT! This is only here while work
+# continues on the feature/crypto branch.  Later, this will be added
+# to the devstack proxy-config so that gate tests can pass.
+# base64 encoding of "dontEverUseThisIn_PRODUCTION_xxxxxxxxxxxxxxx"
+encryption_root_secret = ZG9udEV2ZXJVc2VUaGlzSW5fUFJPRFVDVElPTl94eHh4eHh4eHh4eHh4eHg=
+
+[filter:encryption]
+use = egg:swift#encryption
+
+# By default all PUT or POST'ed object data and/or metadata will be encrypted.
+# Encryption of new data and/or metadata may be disabled by setting
+# disable_encryption to True. However, all encryption middleware should remain
+# in the pipeline in order for existing encrypted data to be read.
+# disable_encryption = False

etc/swift.conf-sample

@@ -136,9 +136,10 @@ aliases = yellow, orange
 
 
 # By default the maximum number of allowed headers depends on the number of max
-# allowed metadata settings plus a default value of 32 for regular http
-# headers.  If for some reason this is not enough (custom middleware for
-# example) it can be increased with the extra_header_count constraint.
+# allowed metadata settings plus a default value of 36 for swift internally
+# generated headers and regular http headers.  If for some reason this is not
+# enough (custom middleware for example) it can be increased with the
+# extra_header_count constraint.
 
 #extra_header_count = 0
 

other-requirements.txt

@@ -13,3 +13,5 @@ python-dev [platform:dpkg]
 python-devel [platform:rpm]
 rsync
 xfsprogs
+libssl-dev [platform:dpkg]
+openssl-devel [platform:rpm]

requirements.txt

@@ -11,3 +11,4 @@ pastedeploy>=1.3.3
 six>=1.9.0
 xattr>=0.4
 PyECLib>=1.2.0                          # BSD
+cryptography>=1.0,!=1.3.0               # BSD/Apache-2.0

setup.cfg

@@ -97,6 +97,8 @@ paste.filter_factory =
     xprofile = swift.common.middleware.xprofile:filter_factory
     versioned_writes = swift.common.middleware.versioned_writes:filter_factory
     copy = swift.common.middleware.copy:filter_factory
+    keymaster = swift.common.middleware.crypto.keymaster:filter_factory
+    encryption = swift.common.middleware.crypto:filter_factory
 
 [build_sphinx]
 all_files = 1

swift/common/constraints.py

@@ -110,10 +110,11 @@ FORMAT2CONTENT_TYPE = {'plain': 'text/plain', 'json': 'application/json',
 
 
 # By default the maximum number of allowed headers depends on the number of max
-# allowed metadata settings plus a default value of 32 for regular http
-# headers.  If for some reason this is not enough (custom middleware for
-# example) it can be increased with the extra_header_count constraint.
-MAX_HEADER_COUNT = MAX_META_COUNT + 32 + max(EXTRA_HEADER_COUNT, 0)
+# allowed metadata settings plus a default value of 36 for swift internally
+# generated headers and regular http headers.  If for some reason this is not
+# enough (custom middleware for example) it can be increased with the
+# extra_header_count constraint.
+MAX_HEADER_COUNT = MAX_META_COUNT + 36 + max(EXTRA_HEADER_COUNT, 0)
 
 
 def check_metadata(req, target_type):

swift/common/exceptions.py

@@ -207,6 +207,10 @@ class APIVersionError(SwiftException):
     pass
 
 
+class EncryptionException(SwiftException):
+    pass
+
+
 class ClientException(Exception):
 
     def __init__(self, msg, http_scheme='', http_host='', http_port='',

swift/common/middleware/crypto/__init__.py

@@ -0,0 +1,34 @@
+# Copyright (c) 2016 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+Implements middleware for object encryption which comprises an instance of a
+Decrypter combined with an instance of an Encrypter.
+"""
+from swift.common.middleware.crypto.decrypter import Decrypter
+from swift.common.middleware.crypto.encrypter import Encrypter
+
+from swift.common.utils import config_true_value, register_swift_info
+
+
+def filter_factory(global_conf, **local_conf):
+    """Provides a factory function for loading encryption middleware."""
+    conf = global_conf.copy()
+    conf.update(local_conf)
+    enabled = not config_true_value(conf.get('disable_encryption', 'false'))
+    register_swift_info('encryption', admin=True, enabled=enabled)
+
+    def encryption_filter(app):
+        return Decrypter(Encrypter(app, conf), conf)
+    return encryption_filter

swift/common/middleware/crypto/crypto_utils.py

@@ -0,0 +1,283 @@
+# Copyright (c) 2015-2016 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import base64
+import binascii
+import collections
+import json
+import os
+
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
+import six
+from six.moves.urllib import parse as urlparse
+
+from swift import gettext_ as _
+from swift.common.exceptions import EncryptionException
+from swift.common.swob import HTTPInternalServerError
+from swift.common.utils import get_logger
+from swift.common.wsgi import WSGIContext
+
+CRYPTO_KEY_CALLBACK = 'swift.callback.fetch_crypto_keys'
+
+
+class Crypto(object):
+    """
+    Used by middleware: Calls cryptography library
+    """
+    cipher = 'AES_CTR_256'
+    # AES will accept several key sizes - we are using 256 bits i.e. 32 bytes
+    key_length = 32
+    iv_length = algorithms.AES.block_size / 8
+
+    def __init__(self, conf=None):
+        self.logger = get_logger(conf, log_route="crypto")
+        # memoize backend to avoid repeated iteration over entry points
+        self.backend = default_backend()
+
+    def create_encryption_ctxt(self, key, iv):
+        """
+        Creates a crypto context for encrypting
+
+        :param key: 256-bit key
+        :param iv: 128-bit iv or nonce used for encryption
+        :raises: ValueError on invalid key or iv
+        :returns: an instance of an encryptor
+        """
+        self.check_key(key)
+        engine = Cipher(algorithms.AES(key), modes.CTR(iv),
+                        backend=self.backend)
+        return engine.encryptor()
+
+    def create_decryption_ctxt(self, key, iv, offset):
+        """
+        Creates a crypto context for decrypting
+
+        :param key: 256-bit key
+        :param iv: 128-bit iv or nonce used for decryption
+        :param offset: offset into the message; used for range reads
+        :returns: an instance of a decryptor
+        """
+        self.check_key(key)
+        if offset < 0:
+            raise ValueError('Offset must not be negative')
+        if offset:
+            # Adjust IV so that it is correct for decryption at offset.
+            # The CTR mode offset is incremented for every AES block and taken
+            # modulo 2^128.
+            offset_blocks, offset_in_block = divmod(offset, self.iv_length)
+            ivl = long(binascii.hexlify(iv), 16) + offset_blocks
+            ivl %= 1 << algorithms.AES.block_size
+            iv = str(bytearray.fromhex(format(
+                ivl, '0%dx' % (2 * self.iv_length))))
+        else:
+            offset_in_block = 0
+
+        engine = Cipher(algorithms.AES(key), modes.CTR(iv),
+                        backend=self.backend)
+        dec = engine.decryptor()
+        # Adjust decryption boundary within current AES block
+        dec.update('*' * offset_in_block)
+        return dec
+
+    def create_iv(self):
+        return os.urandom(self.iv_length)
+
+    def create_crypto_meta(self):
+        # create a set of parameters
+        return {'iv': self.create_iv(), 'cipher': self.cipher}
+
+    def check_crypto_meta(self, meta):
+        """
+        Check that crypto meta dict has valid items.
+
+        :param meta: a dict
+        :raises EncryptionException: if an error is found in the crypto meta
+        """
+        try:
+            if meta['cipher'] != self.cipher:
+                raise EncryptionException('Bad crypto meta: Cipher must be %s'
+                                          % self.cipher)
+            if len(meta['iv']) != self.iv_length:
+                raise EncryptionException(
+                    'Bad crypto meta: IV must be length %s bytes'
+                    % self.iv_length)
+        except KeyError as err:
+            raise EncryptionException(
+                'Bad crypto meta: Missing %s' % err)
+
+    def create_random_key(self):
+        # helper method to create random key of correct length
+        return os.urandom(self.key_length)
+
+    def wrap_key(self, wrapping_key, key_to_wrap):
+        # we don't use an RFC 3394 key wrap algorithm such as cryptography's
+        # aes_wrap_key because it's slower and we have iv material readily
+        # available so don't need a deterministic algorithm
+        iv = self.create_iv()
+        encryptor = Cipher(algorithms.AES(wrapping_key), modes.CTR(iv),
+                           backend=self.backend).encryptor()
+        return {'key': encryptor.update(key_to_wrap), 'iv': iv}
+
+    def unwrap_key(self, wrapping_key, context):
+        # unwrap a key from dict of form returned by wrap_key
+        # check the key length early - unwrapping won't change the length
+        self.check_key(context['key'])
+        decryptor = Cipher(algorithms.AES(wrapping_key),
+                           modes.CTR(context['iv']),
+                           backend=self.backend).decryptor()
+        return decryptor.update(context['key'])
+
+    def check_key(self, key):
+        if len(key) != self.key_length:
+            raise ValueError("Key must be length %s bytes" % self.key_length)
+
+
+class CryptoWSGIContext(WSGIContext):
+    """
+    Base class for contexts used by crypto middlewares.
+    """
+    def __init__(self, crypto_app, server_type, logger):
+        super(CryptoWSGIContext, self).__init__(crypto_app.app)
+        self.crypto = crypto_app.crypto
+        self.logger = logger
+        self.server_type = server_type
+
+    def get_keys(self, env, required=None):
+        # Get the key(s) from the keymaster
+        required = required if required is not None else [self.server_type]
+        try:
+            fetch_crypto_keys = env[CRYPTO_KEY_CALLBACK]
+        except KeyError:
+            self.logger.exception(_('ERROR get_keys() missing callback'))
+            raise HTTPInternalServerError(
+                "Unable to retrieve encryption keys.")
+
+        try:
+            keys = fetch_crypto_keys()
+        except Exception as err:  # noqa
+            self.logger.exception(_(
+                'ERROR get_keys(): from callback: %s') % err)
+            raise HTTPInternalServerError(
+                "Unable to retrieve encryption keys.")
+
+        for name in required:
+            try:
+                key = keys[name]
+                self.crypto.check_key(key)
+                continue
+            except KeyError:
+                self.logger.exception(_("Missing key for %r") % name)
+            except TypeError:
+                self.logger.exception(_("Did not get a keys dict"))
+            except ValueError as e:
+                # don't include the key in any messages!
+                self.logger.exception(_("Bad key for %(name)r: %(err)s") %
+                                      {'name': name, 'err': e})
+            raise HTTPInternalServerError(
+                "Unable to retrieve encryption keys.")
+
+        return keys
+
+
+def dump_crypto_meta(crypto_meta):
+    """
+    Serialize crypto meta to a form suitable for including in a header value.
+
+    The crypto-meta is serialized as a json object. The iv and key values are
+    random bytes and as a result need to be base64 encoded before sending over
+    the wire. Base64 encoding returns a bytes object in py3, to future proof
+    the code, decode this data to produce a string, which is what the
+    json.dumps function expects.
+
+    :param crypto_meta: a dict containing crypto meta items
+    :returns: a string serialization of a crypto meta dict
+    """
+    def b64_encode_meta(crypto_meta):
+        return {
+            name: (base64.b64encode(value).decode() if name in ('iv', 'key')
+                   else b64_encode_meta(value) if isinstance(value, dict)
+                   else value)
+            for name, value in crypto_meta.items()}
+
+    # use sort_keys=True to make serialized form predictable for testing
+    return urlparse.quote_plus(
+        json.dumps(b64_encode_meta(crypto_meta), sort_keys=True))
+
+
+def load_crypto_meta(value):
+    """
+    Build the crypto_meta from the json object.
+
+    Note that json.loads always produces unicode strings, to ensure the
+    resultant crypto_meta matches the original object cast all key and value
+    data to a str except the key and iv which are base64 decoded. This will
+    work in py3 as well where all strings are unicode implying the cast is
+    effectively a no-op.
+
+    :param value: a string serialization of a crypto meta dict
+    :returns: a dict containing crypto meta items
+    :raises EncryptionException: if an error occurs while parsing the
+                                 crypto meta
+    """
+    def b64_decode_meta(crypto_meta):
+        return {
+            str(name): (base64.b64decode(val) if name in ('iv', 'key')
+                        else b64_decode_meta(val) if isinstance(val, dict)
+                        else val.encode('utf8'))
+            for name, val in crypto_meta.items()}
+
+    try:
+        if not isinstance(value, six.string_types):
+            raise ValueError('crypto meta not a string')
+        val = json.loads(urlparse.unquote_plus(value))
+        if not isinstance(val, collections.Mapping):
+            raise ValueError('crypto meta not a Mapping')
+        return b64_decode_meta(val)
+    except (KeyError, ValueError, TypeError) as err:
+        msg = 'Bad crypto meta %r: %s' % (value, err)
+        raise EncryptionException(msg)
+
+
+def append_crypto_meta(value, crypto_meta):
+    """
+    Serialize and append crypto metadata to an encrypted value.
+
+    :param value: value to which serialized crypto meta will be appended.
+    :param crypto_meta: a dict of crypto meta
+    :return: a string of the form <value>; swift_meta=<serialized crypto meta>
+    """
+    return '%s; swift_meta=%s' % (value, dump_crypto_meta(crypto_meta))
+
+
+def extract_crypto_meta(value):
+    """
+    Extract and deserialize any crypto meta from the end of a value.
+
+    :param value: string that may have crypto meta at end
+    :return: a tuple of the form:
+            (<value without crypto meta>, <deserialized crypto meta> or None)
+    """
+    crypto_meta = None
+    # we only attempt to extract crypto meta from values that we know were
+    # encrypted and base64-encoded, or from etag values, so it's safe to split
+    # on ';' even if it turns out that the value was an unencrypted etag
+    parts = value.split(';')
+    if len(parts) == 2:
+        value, param = parts
+        crypto_meta_tag = 'swift_meta='
+        if param.strip().startswith(crypto_meta_tag):
+            param = param.strip()[len(crypto_meta_tag):]
+            crypto_meta = load_crypto_meta(param)
+    return value, crypto_meta

swift/common/middleware/crypto/decrypter.py

@@ -0,0 +1,449 @@
+# Copyright (c) 2015-2016 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import base64
+import json
+import xml.etree.cElementTree as ElementTree
+
+from swift import gettext_ as _
+from swift.common.http import is_success
+from swift.common.middleware.crypto.crypto_utils import CryptoWSGIContext, \
+    load_crypto_meta, extract_crypto_meta, Crypto
+from swift.common.exceptions import EncryptionException
+from swift.common.request_helpers import get_object_transient_sysmeta, \
+    get_listing_content_type, get_sys_meta_prefix, get_user_meta_prefix
+from swift.common.swob import Request, HTTPException, HTTPInternalServerError
+from swift.common.utils import get_logger, config_true_value, \
+    parse_content_range, closing_if_possible, parse_content_type, \
+    FileLikeIter, multipart_byteranges_to_document_iters
+
+DECRYPT_CHUNK_SIZE = 65536
+
+
+def purge_crypto_sysmeta_headers(headers):
+    return [h for h in headers if not
+            h[0].lower().startswith(
+                (get_object_transient_sysmeta('crypto-'),
+                 get_sys_meta_prefix('object') + 'crypto-'))]
+
+
+class BaseDecrypterContext(CryptoWSGIContext):
+    def get_crypto_meta(self, header_name):
+        """
+        Extract a crypto_meta dict from a header.
+
+        :param header_name: name of header that may have crypto_meta
+        :return: A dict containing crypto_meta items
+        :raises EncryptionException: if an error occurs while parsing the
+                                     crypto meta
+        """
+        crypto_meta_json = self._response_header_value(header_name)
+
+        if crypto_meta_json is None:
+            return None
+        crypto_meta = load_crypto_meta(crypto_meta_json)
+        self.crypto.check_crypto_meta(crypto_meta)
+        return crypto_meta
+
+    def get_unwrapped_key(self, crypto_meta, wrapping_key):
+        """
+        Get a wrapped key from crypto-meta and unwrap it using the provided
+        wrapping key.
+
+        :param crypto_meta: a dict of crypto-meta
+        :param wrapping_key: key to be used to decrypt the wrapped key
+        :return: an unwrapped key
+        :raises EncryptionException: if the crypto-meta has no wrapped key or
+                                     the unwrapped key is invalid
+        """
+        try:
+            return self.crypto.unwrap_key(wrapping_key,
+                                          crypto_meta['body_key'])
+        except KeyError as err:
+            err = 'Missing %s' % err
+        except ValueError as err:
+            pass
+        msg = 'Error decrypting %s' % self.server_type
+        self.logger.error(_('%(msg)s: %(err)s') % {'msg': msg, 'err': err})
+        raise HTTPInternalServerError(body=msg, content_type='text/plain')
+
+    def decrypt_value_with_meta(self, value, key, required=False):
+        """
+        Base64-decode and decrypt a value if crypto meta can be extracted from
+        the value itself, otherwise return the value unmodified.
+
+        A value should either be a string that does not contain the ';'
+        character or should be of the form:
+
+            <base64-encoded ciphertext>;swift_meta=<crypto meta>
+
+        :param value: value to decrypt
+        :param key: crypto key to use
+        :param required: if True then the value is required to be decrypted
+                         and an EncryptionException will be raised if the
+                         header cannot be decrypted due to missing crypto meta.
+        :returns: decrypted value if crypto meta is found, otherwise the
+                  unmodified value
+        :raises EncryptionException: if an error occurs while parsing crypto
+                                     meta or if the header value was required
+                                     to be decrypted but crypto meta was not
+                                     found.
+        """
+        value, crypto_meta = extract_crypto_meta(value)
+        if crypto_meta:
+            self.crypto.check_crypto_meta(crypto_meta)
+            value = self.decrypt_value(value, key, crypto_meta)
+        elif required:
+            raise EncryptionException(
+                "Missing crypto meta in value %s" % value)
+        return value
+
+    def decrypt_value(self, value, key, crypto_meta):
+        """
+        Base64-decode and decrypt a value using the crypto_meta provided.
+
+        :param value: a base64-encoded value to decrypt
+        :param key: crypto key to use
+        :param crypto_meta: a crypto-meta dict of form returned by
+            :py:func:`~swift.common.middleware.crypto.Crypto.get_crypto_meta`
+        :returns: decrypted value
+        """
+        if not value:
+            return ''
+        crypto_ctxt = self.crypto.create_decryption_ctxt(
+            key, crypto_meta['iv'], 0)
+        return crypto_ctxt.update(base64.b64decode(value))
+
+    def get_decryption_keys(self, req):
+        """
+        Determine if a response should be decrypted, and if so then fetch keys.
+
+        :param req: a Request object
+        :returns: a dict of decryption keys
+        """
+        if config_true_value(req.environ.get('swift.crypto.override')):
+            self.logger.debug('No decryption is necessary because of override')
+            return None
+
+        return self.get_keys(req.environ)
+
+
+class DecrypterObjContext(BaseDecrypterContext):
+    def __init__(self, decrypter, logger):
+        super(DecrypterObjContext, self).__init__(decrypter, 'object', logger)
+
+    def _decrypt_header(self, header, value, key, required=False):
+        """
+        Attempt to decrypt a header value that may be encrypted.
+
+        :param header: the header name
+        :param value: the header value
+        :param key: decryption key
+        :param required: if True then the header is required to be decrypted
+                         and an HTTPInternalServerError will be raised if the
+                         header cannot be decrypted due to missing crypto meta.
+        :return: decrypted value or the original value if it was not encrypted.
+        :raises HTTPInternalServerError: if an error occurred during decryption
+                                         or if the header value was required to
+                                         be decrypted but crypto meta was not
+                                         found.
+        """
+        try:
+            return self.decrypt_value_with_meta(value, key, required)
+        except EncryptionException as e:
+            msg = "Error decrypting header"
+            self.logger.error(_("%(msg)s %(hdr)s: %(e)s") %
+                              {'msg': msg, 'hdr': header, 'e': e})
+            raise HTTPInternalServerError(body=msg, content_type='text/plain')
+
+    def decrypt_user_metadata(self, keys):
+        prefix = get_object_transient_sysmeta('crypto-meta-')
+        prefix_len = len(prefix)
+        new_prefix = get_user_meta_prefix(self.server_type).title()
+        result = []
+        for name, val in self._response_headers:
+            if name.lower().startswith(prefix) and val:
+                short_name = name[prefix_len:]
+                decrypted_value = self._decrypt_header(
+                    name, val, keys[self.server_type], required=True)
+                result.append((new_prefix + short_name, decrypted_value))
+        return result
+
+    def decrypt_resp_headers(self, keys):
+        """
+        Find encrypted headers and replace with the decrypted versions.
+
+        :param keys: a dict of decryption keys.
+        :return: A list of headers with any encrypted headers replaced by their
+                 decrypted values.
+        :raises HTTPInternalServerError: if any error occurs while decrypting
+                                         headers
+        """
+        mod_hdr_pairs = []
+
+        # Decrypt plaintext etag and place in Etag header for client response
+        etag_header = 'X-Object-Sysmeta-Crypto-Etag'
+        encrypted_etag = self._response_header_value(etag_header)
+        if encrypted_etag:
+            decrypted_etag = self._decrypt_header(
+                etag_header, encrypted_etag, keys['object'], required=True)
+            mod_hdr_pairs.append(('Etag', decrypted_etag))
+
+        etag_header = 'X-Object-Sysmeta-Container-Update-Override-Etag'
+        encrypted_etag = self._response_header_value(etag_header)
+        if encrypted_etag:
+            decrypted_etag = self._decrypt_header(
+                etag_header, encrypted_etag, keys['container'])
+            mod_hdr_pairs.append((etag_header, decrypted_etag))
+
+        # Decrypt all user metadata. Encrypted user metadata values are stored
+        # in the x-object-transient-sysmeta-crypto-meta- namespace. Those are
+        # decrypted and moved back to the x-object-meta- namespace. Prior to
+        # decryption, the response should have no x-object-meta- headers, but
+        # if it does then they will be overwritten by any decrypted headers
+        # that map to the same x-object-meta- header names i.e. decrypted
+        # headers win over unexpected, unencrypted headers.
+        mod_hdr_pairs.extend(self.decrypt_user_metadata(keys))
+
+        mod_hdr_names = {h.lower() for h, v in mod_hdr_pairs}
+        mod_hdr_pairs.extend([(h, v) for h, v in self._response_headers
+                              if h.lower() not in mod_hdr_names])
+        return mod_hdr_pairs
+
+    def multipart_response_iter(self, resp, boundary, body_key, crypto_meta):
+        """
+        Decrypts a multipart mime doc response body.
+
+        :param resp: application response
+        :param boundary: multipart boundary string
+        :param keys: a dict of decryption keys.
+        :param crypto_meta: crypto_meta for the response body
+        :return: generator for decrypted response body
+        """
+        with closing_if_possible(resp):
+            parts_iter = multipart_byteranges_to_document_iters(
+                FileLikeIter(resp), boundary)
+            for first_byte, last_byte, length, headers, body in parts_iter:
+                yield "--" + boundary + "\r\n"
+
+                for header_pair in headers:
+                    yield "%s: %s\r\n" % header_pair
+
+                yield "\r\n"
+
+                decrypt_ctxt = self.crypto.create_decryption_ctxt(
+                    body_key, crypto_meta['iv'], first_byte)
+                for chunk in iter(lambda: body.read(DECRYPT_CHUNK_SIZE), ''):
+                    yield decrypt_ctxt.update(chunk)
+
+                yield "\r\n"
+
+            yield "--" + boundary + "--"
+
+    def response_iter(self, resp, body_key, crypto_meta, offset):
+        """
+        Decrypts a response body.
+
+        :param resp: application response
+        :param keys: a dict of decryption keys.
+        :param crypto_meta: crypto_meta for the response body
+        :param offset: offset into object content at which response body starts
+        :return: generator for decrypted response body
+        """
+        decrypt_ctxt = self.crypto.create_decryption_ctxt(
+            body_key, crypto_meta['iv'], offset)
+        with closing_if_possible(resp):
+            for chunk in resp:
+                yield decrypt_ctxt.update(chunk)
+
+    def handle_get(self, req, start_response):
+        app_resp = self._app_call(req.environ)
+
+        keys = self.get_decryption_keys(req)
+        if keys is None:
+            # skip decryption
+            start_response(self._response_status, self._response_headers,
+                           self._response_exc_info)
+            return app_resp
+
+        mod_resp_headers = self.decrypt_resp_headers(keys)
+
+        crypto_meta = None
+        if is_success(self._get_status_int()):
+            try:
+                crypto_meta = self.get_crypto_meta(
+                    'X-Object-Sysmeta-Crypto-Body-Meta')
+            except EncryptionException as err:
+                msg = 'Error decrypting object'
+                self.logger.error(_('%(msg)s: %(err)s') %
+                                  {'msg': msg, 'err': err})
+                raise HTTPInternalServerError(
+                    body=msg, content_type='text/plain')
+
+        if crypto_meta:
+            # 2xx response and encrypted body
+            body_key = self.get_unwrapped_key(crypto_meta, keys['object'])
+            content_type, content_type_attrs = parse_content_type(
+                self._response_header_value('Content-Type'))
+
+            if (self._get_status_int() == 206 and
+                    content_type == 'multipart/byteranges'):
+                boundary = dict(content_type_attrs)["boundary"]
+                resp_iter = self.multipart_response_iter(
+                    app_resp, boundary, body_key, crypto_meta)
+            else:
+                offset = 0
+                content_range = self._response_header_value('Content-Range')
+                if content_range:
+                    # Determine offset within the whole object if ranged GET
+                    offset, end, total = parse_content_range(content_range)
+                resp_iter = self.response_iter(
+                    app_resp, body_key, crypto_meta, offset)
+        else:
+            # don't decrypt body of unencrypted or non-2xx responses
+            resp_iter = app_resp
+
+        mod_resp_headers = purge_crypto_sysmeta_headers(mod_resp_headers)
+        start_response(self._response_status, mod_resp_headers,
+                       self._response_exc_info)
+
+        return resp_iter
+
+    def handle_head(self, req, start_response):
+        app_resp = self._app_call(req.environ)
+
+        keys = self.get_decryption_keys(req)
+
+        if keys is None:
+            # skip decryption
+            start_response(self._response_status, self._response_headers,
+                           self._response_exc_info)
+        else:
+            mod_resp_headers = self.decrypt_resp_headers(keys)
+            mod_resp_headers = purge_crypto_sysmeta_headers(mod_resp_headers)
+            start_response(self._response_status, mod_resp_headers,
+                           self._response_exc_info)
+
+        return app_resp
+
+
+class DecrypterContContext(BaseDecrypterContext):
+    def __init__(self, decrypter, logger):
+        super(DecrypterContContext, self).__init__(
+            decrypter, 'container', logger)
+
+    def handle_get(self, req, start_response):
+        app_resp = self._app_call(req.environ)
+
+        if is_success(self._get_status_int()):
+            # only decrypt body of 2xx responses
+            out_content_type = get_listing_content_type(req)
+            if out_content_type == 'application/json':
+                handler = self.process_json_resp
+                keys = self.get_decryption_keys(req)
+            elif out_content_type.endswith('/xml'):
+                handler = self.process_xml_resp
+                keys = self.get_decryption_keys(req)
+            else:
+                handler = keys = None
+
+            if handler and keys:
+                try:
+                    app_resp = handler(keys['container'], app_resp)
+                except EncryptionException as err:
+                    msg = "Error decrypting container listing"
+                    self.logger.error(_('%(msg)s: %(err)s') %
+                                      {'msg': msg, 'err': err})
+                    raise HTTPInternalServerError(
+                        body=msg, content_type='text/plain')
+
+        start_response(self._response_status,
+                       self._response_headers,
+                       self._response_exc_info)
+
+        return app_resp
+
+    def update_content_length(self, new_total_len):
+        self._response_headers = [
+            (h, v) for h, v in self._response_headers
+            if h.lower() != 'content-length']
+        self._response_headers.append(('Content-Length', str(new_total_len)))
+
+    def process_json_resp(self, key, resp_iter):
+        """
+        Parses json body listing and decrypt encrypted entries. Updates
+        Content-Length header with new body length and return a body iter.
+        """
+        with closing_if_possible(resp_iter):
+            resp_body = ''.join(resp_iter)
+        body_json = json.loads(resp_body)
+        new_body = json.dumps([self.decrypt_obj_dict(obj_dict, key)
+                               for obj_dict in body_json])
+        self.update_content_length(len(new_body))
+        return [new_body]
+
+    def decrypt_obj_dict(self, obj_dict, key):
+        ciphertext = obj_dict['hash']
+        obj_dict['hash'] = self.decrypt_value_with_meta(ciphertext, key)
+        return obj_dict
+
+    def process_xml_resp(self, key, resp_iter):
+        """
+        Parses xml body listing and decrypt encrypted entries. Updates
+        Content-Length header with new body length and return a body iter.
+        """
+        with closing_if_possible(resp_iter):
+            resp_body = ''.join(resp_iter)
+        tree = ElementTree.fromstring(resp_body)
+        for elem in tree.iter('hash'):
+            ciphertext = elem.text.encode('utf8')
+            plain = self.decrypt_value_with_meta(ciphertext, key)
+            elem.text = plain.decode('utf8')
+        new_body = ElementTree.tostring(tree, encoding='UTF-8').replace(
+            "<?xml version='1.0' encoding='UTF-8'?>",
+            '<?xml version="1.0" encoding="UTF-8"?>', 1)
+        self.update_content_length(len(new_body))
+        return [new_body]
+
+
+class Decrypter(object):
+    """Middleware for decrypting data and user metadata."""
+
+    def __init__(self, app, conf):
+        self.app = app
+        self.logger = get_logger(conf, log_route="decrypter")
+        self.crypto = Crypto(conf)
+
+    def __call__(self, env, start_response):
+        req = Request(env)
+        try:
+            parts = req.split_path(3, 4, True)
+        except ValueError:
+            return self.app(env, start_response)
+
+        if parts[3] and req.method == 'GET':
+            handler = DecrypterObjContext(self, self.logger).handle_get
+        elif parts[3] and req.method == 'HEAD':
+            handler = DecrypterObjContext(self, self.logger).handle_head
+        elif parts[2] and req.method == 'GET':
+            handler = DecrypterContContext(self, self.logger).handle_get
+        else:
+            # url and/or request verb is not handled by decrypter
+            return self.app(env, start_response)
+
+        try:
+            return handler(req, start_response)
+        except HTTPException as err_resp:
+            return err_resp(env, start_response)

swift/common/middleware/crypto/encrypter.py

@@ -0,0 +1,369 @@
+# Copyright (c) 2015-2016 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import base64
+import hashlib
+import hmac
+from contextlib import contextmanager
+
+from swift.common.constraints import check_metadata
+from swift.common.http import is_success
+from swift.common.middleware.crypto.crypto_utils import CryptoWSGIContext, \
+    dump_crypto_meta, append_crypto_meta, Crypto
+from swift.common.request_helpers import get_object_transient_sysmeta, \
+    strip_user_meta_prefix, is_user_meta, update_etag_is_at_header
+from swift.common.swob import Request, Match, HTTPException, \
+    HTTPUnprocessableEntity
+from swift.common.utils import get_logger, config_true_value
+
+
+def encrypt_header_val(crypto, value, key):
+    """
+    Encrypt a header value using the supplied key.
+
+    :param crypto: a Crypto instance
+    :param value: value to encrypt
+    :param key: crypto key to use
+    :returns: a tuple of (encrypted value, crypto_meta) where crypto_meta is a
+        dict of form returned by
+        :py:func:`~swift.common.middleware.crypto.Crypto.get_crypto_meta`
+    """
+    if not value:
+        return '', None
+
+    crypto_meta = crypto.create_crypto_meta()
+    crypto_ctxt = crypto.create_encryption_ctxt(key, crypto_meta['iv'])
+    enc_val = base64.b64encode(crypto_ctxt.update(value))
+    return enc_val, crypto_meta
+
+
+def _hmac_etag(key, etag):
+    """
+    Compute an HMAC-SHA256 using given key and etag.
+
+    :param key: The starting key for the hash.
+    :param etag: The etag to hash.
+    :returns: a Base64-encoded representation of the HMAC
+    """
+    result = hmac.new(key, etag, digestmod=hashlib.sha256).digest()
+    return base64.b64encode(result).decode()
+
+
+class EncInputWrapper(object):
+    """File-like object to be swapped in for wsgi.input."""
+    def __init__(self, crypto, keys, req, logger):
+        self.env = req.environ
+        self.wsgi_input = req.environ['wsgi.input']
+        self.path = req.path
+        self.crypto = crypto
+        self.body_crypto_ctxt = None
+        self.keys = keys
+        self.plaintext_md5 = None
+        self.ciphertext_md5 = None
+        self.logger = logger
+        self.install_footers_callback(req)
+
+    def _init_encryption_context(self):
+        # do this once when body is first read
+        if self.body_crypto_ctxt is None:
+            self.body_crypto_meta = self.crypto.create_crypto_meta()
+            body_key = self.crypto.create_random_key()
+            # wrap the body key with object key
+            self.body_crypto_meta['body_key'] = self.crypto.wrap_key(
+                self.keys['object'], body_key)
+            self.body_crypto_meta['key_id'] = self.keys['id']
+            self.body_crypto_ctxt = self.crypto.create_encryption_ctxt(
+                body_key, self.body_crypto_meta.get('iv'))
+            self.plaintext_md5 = hashlib.md5()
+            self.ciphertext_md5 = hashlib.md5()
+
+    def install_footers_callback(self, req):
+        # the proxy controller will call back for footer metadata after
+        # body has been sent
+        inner_callback = req.environ.get('swift.callback.update_footers')
+        # remove any Etag from headers, it won't be valid for ciphertext and
+        # we'll send the ciphertext Etag later in footer metadata
+        client_etag = req.headers.pop('etag', None)
+        container_listing_etag_header = req.headers.get(
+            'X-Object-Sysmeta-Container-Update-Override-Etag')
+
+        def footers_callback(footers):
+            if inner_callback:
+                # pass on footers dict to any other callback that was
+                # registered before this one. It may override any footers that
+                # were set.
+                inner_callback(footers)
+
+            plaintext_etag = None
+            if self.body_crypto_ctxt:
+                plaintext_etag = self.plaintext_md5.hexdigest()
+                # If client (or other middleware) supplied etag, then validate
+                # against plaintext etag
+                etag_to_check = footers.get('Etag') or client_etag
+                if (etag_to_check is not None and
+                        plaintext_etag != etag_to_check):
+                    raise HTTPUnprocessableEntity(request=Request(self.env))
+
+                # override any previous notion of etag with the ciphertext etag
+                footers['Etag'] = self.ciphertext_md5.hexdigest()
+
+                # Encrypt the plaintext etag using the object key and persist
+                # as sysmeta along with the crypto parameters that were used.
+                encrypted_etag, etag_crypto_meta = encrypt_header_val(
+                    self.crypto, plaintext_etag, self.keys['object'])
+                footers['X-Object-Sysmeta-Crypto-Etag'] = \
+                    append_crypto_meta(encrypted_etag, etag_crypto_meta)
+                footers['X-Object-Sysmeta-Crypto-Body-Meta'] = \
+                    dump_crypto_meta(self.body_crypto_meta)
+
+                # Also add an HMAC of the etag for use when evaluating
+                # conditional requests
+                footers['X-Object-Sysmeta-Crypto-Etag-Mac'] = _hmac_etag(
+                    self.keys['object'], plaintext_etag)
+            else:
+                # No data was read from body, nothing was encrypted, so don't
+                # set any crypto sysmeta for the body, but do re-instate any
+                # etag provided in inbound request if other middleware has not
+                # already set a value.
+                if client_etag is not None:
+                    footers.setdefault('Etag', client_etag)
+
+            # When deciding on the etag that should appear in container
+            # listings, look for:
+            #   * override in the footer, otherwise
+            #   * override in the header, and finally
+            #   * MD5 of the plaintext received
+            # This may be None if no override was set and no data was read
+            container_listing_etag = footers.get(
+                'X-Object-Sysmeta-Container-Update-Override-Etag',
+                container_listing_etag_header) or plaintext_etag
+
+            if container_listing_etag is not None:
+                # Encrypt the container-listing etag using the container key
+                # and a random IV, and use it to override the container update
+                # value, with the crypto parameters appended. We use the
+                # container key here so that only that key is required to
+                # decrypt all etag values in a container listing when handling
+                # a container GET request.
+                val, crypto_meta = encrypt_header_val(
+                    self.crypto, container_listing_etag,
+                    self.keys['container'])
+                crypto_meta['key_id'] = self.keys['id']
+                footers['X-Object-Sysmeta-Container-Update-Override-Etag'] = \
+                    append_crypto_meta(val, crypto_meta)
+            # else: no override was set and no data was read
+
+        req.environ['swift.callback.update_footers'] = footers_callback
+
+    def read(self, *args, **kwargs):
+        return self.readChunk(self.wsgi_input.read, *args, **kwargs)
+
+    def readline(self, *args, **kwargs):
+        return self.readChunk(self.wsgi_input.readline, *args, **kwargs)
+
+    def readChunk(self, read_method, *args, **kwargs):
+        chunk = read_method(*args, **kwargs)
+
+        if chunk:
+            self._init_encryption_context()
+            self.plaintext_md5.update(chunk)
+            # Encrypt one chunk at a time
+            ciphertext = self.body_crypto_ctxt.update(chunk)
+            self.ciphertext_md5.update(ciphertext)
+            return ciphertext
+
+        return chunk
+
+
+class EncrypterObjContext(CryptoWSGIContext):
+    def __init__(self, encrypter, logger):
+        super(EncrypterObjContext, self).__init__(
+            encrypter, 'object', logger)
+
+    def _check_headers(self, req):
+        # Check the user-metadata length before encrypting and encoding
+        error_response = check_metadata(req, self.server_type)
+        if error_response:
+            raise error_response
+
+    def encrypt_user_metadata(self, req, keys):
+        """
+        Encrypt user-metadata header values. Replace each x-object-meta-<key>
+        user metadata header with a corresponding
+        x-object-transient-sysmeta-crypto-meta-<key> header which has the
+        crypto metadata required to decrypt appended to the encrypted value.
+
+        :param req: a swob Request
+        :param keys: a dict of encryption keys
+        """
+        prefix = get_object_transient_sysmeta('crypto-meta-')
+        user_meta_headers = [h for h in req.headers.items() if
+                             is_user_meta(self.server_type, h[0]) and h[1]]
+        crypto_meta = None
+        for name, val in user_meta_headers:
+            short_name = strip_user_meta_prefix(self.server_type, name)
+            new_name = prefix + short_name
+            enc_val, crypto_meta = encrypt_header_val(
+                self.crypto, val, keys[self.server_type])
+            req.headers[new_name] = append_crypto_meta(enc_val, crypto_meta)
+            req.headers.pop(name)
+        # store a single copy of the crypto meta items that are common to all
+        # encrypted user metadata independently of any such meta that is stored
+        # with the object body because it might change on a POST. This is done
+        # for future-proofing - the meta stored here is not currently used
+        # during decryption.
+        if crypto_meta:
+            meta = dump_crypto_meta({'cipher': crypto_meta['cipher'],
+                                     'key_id': keys['id']})
+            req.headers[get_object_transient_sysmeta('crypto-meta')] = meta
+
+    def handle_put(self, req, start_response):
+        self._check_headers(req)
+        keys = self.get_keys(req.environ, required=['object', 'container'])
+        self.encrypt_user_metadata(req, keys)
+
+        enc_input_proxy = EncInputWrapper(self.crypto, keys, req, self.logger)
+        req.environ['wsgi.input'] = enc_input_proxy
+
+        resp = self._app_call(req.environ)
+
+        # If an etag is in the response headers and a plaintext etag was
+        # calculated, then overwrite the response value with the plaintext etag
+        # provided it matches the ciphertext etag. If it does not match then do
+        # not overwrite and allow the response value to return to client.
+        mod_resp_headers = self._response_headers
+        if (is_success(self._get_status_int()) and
+                enc_input_proxy.plaintext_md5):
+            plaintext_etag = enc_input_proxy.plaintext_md5.hexdigest()
+            ciphertext_etag = enc_input_proxy.ciphertext_md5.hexdigest()
+            mod_resp_headers = [
+                (h, v if (h.lower() != 'etag' or
+                          v.strip('"') != ciphertext_etag)
+                    else plaintext_etag)
+                for h, v in mod_resp_headers]
+
+        start_response(self._response_status, mod_resp_headers,
+                       self._response_exc_info)
+        return resp
+
+    def handle_post(self, req, start_response):
+        """
+        Encrypt the new object headers with a new iv and the current crypto.
+        Note that an object may have encrypted headers while the body may
+        remain unencrypted.
+        """
+        self._check_headers(req)
+        keys = self.get_keys(req.environ)
+        self.encrypt_user_metadata(req, keys)
+
+        resp = self._app_call(req.environ)
+        start_response(self._response_status, self._response_headers,
+                       self._response_exc_info)
+        return resp
+
+    @contextmanager
+    def _mask_conditional_etags(self, req, header_name):
+        """
+        Calculate HMACs of etags in header value and append to existing list.
+        The HMACs are calculated in the same way as was done for the object
+        plaintext etag to generate the value of
+        X-Object-Sysmeta-Crypto-Etag-Mac when the object was PUT. The object
+        server can therefore use these HMACs to evaluate conditional requests.
+
+        The existing etag values are left in the list of values to match in
+        case the object was not encrypted when it was PUT. It is unlikely that
+        a masked etag value would collide with an unmasked value.
+
+        :param req: an instance of swob.Request
+        :param header_name: name of header that has etags to mask
+        :return: True if any etags were masked, False otherwise
+        """
+        masked = False
+        old_etags = req.headers.get(header_name)
+        if old_etags:
+            keys = self.get_keys(req.environ)
+            new_etags = []
+            for etag in Match(old_etags).tags:
+                if etag == '*':
+                    new_etags.append(etag)
+                    continue
+                masked_etag = _hmac_etag(keys['object'], etag)
+                new_etags.extend(('"%s"' % etag, '"%s"' % masked_etag))
+                masked = True
+
+            req.headers[header_name] = ', '.join(new_etags)
+
+        try:
+            yield masked
+        finally:
+            if old_etags:
+                req.headers[header_name] = old_etags
+
+    def handle_get_or_head(self, req, start_response):
+        with self._mask_conditional_etags(req, 'If-Match') as masked1:
+            with self._mask_conditional_etags(req, 'If-None-Match') as masked2:
+                if masked1 or masked2:
+                    update_etag_is_at_header(
+                        req, 'X-Object-Sysmeta-Crypto-Etag-Mac')
+                resp = self._app_call(req.environ)
+                start_response(self._response_status, self._response_headers,
+                               self._response_exc_info)
+        return resp
+
+
+class Encrypter(object):
+    """Middleware for encrypting data and user metadata.
+
+    By default all PUT or POST'ed object data and/or metadata will be
+    encrypted. Encryption of new data and/or metadata may be disabled by
+    setting the ``disable_encryption`` option to True. However, this middleware
+    should remain in the pipeline in order for existing encrypted data to be
+    read.
+    """
+
+    def __init__(self, app, conf):
+        self.app = app
+        self.logger = get_logger(conf, log_route="encrypter")
+        self.crypto = Crypto(conf)
+        self.disable_encryption = config_true_value(
+            conf.get('disable_encryption', 'false'))
+
+    def __call__(self, env, start_response):
+        # If override is set in env, then just pass along
+        if config_true_value(env.get('swift.crypto.override')):
+            return self.app(env, start_response)
+
+        req = Request(env)
+
+        if self.disable_encryption and req.method in ('PUT', 'POST'):
+            return self.app(env, start_response)
+        try:
+            req.split_path(4, 4, True)
+        except ValueError:
+            return self.app(env, start_response)
+
+        if req.method in ('GET', 'HEAD'):
+            handler = EncrypterObjContext(self, self.logger).handle_get_or_head
+        elif req.method == 'PUT':
+            handler = EncrypterObjContext(self, self.logger).handle_put
+        elif req.method == 'POST':
+            handler = EncrypterObjContext(self, self.logger).handle_post
+        else:
+            # anything else
+            return self.app(env, start_response)
+
+        try:
+            return handler(req, start_response)
+        except HTTPException as err_resp:
+            return err_resp(env, start_response)

swift/common/middleware/crypto/keymaster.py

@@ -0,0 +1,153 @@
+# Copyright (c) 2015 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import base64
+import hashlib
+import hmac
+import os
+
+from swift.common.middleware.crypto.crypto_utils import CRYPTO_KEY_CALLBACK
+from swift.common.swob import Request, HTTPException
+from swift.common.wsgi import WSGIContext
+
+
+class KeyMasterContext(WSGIContext):
+    """
+    The simple scheme for key derivation is as follows: every path is
+    associated with a key, where the key is derived from the path itself in a
+    deterministic fashion such that the key does not need to be stored.
+    Specifically, the key for any path is an HMAC of a root key and the path
+    itself, calculated using an SHA256 hash function::
+
+      <path_key> = HMAC_SHA256(<root_secret>, <path>)
+    """
+    def __init__(self, keymaster, account, container, obj):
+        """
+        :param keymaster: a Keymaster instance
+        :param account: account name
+        :param container: container name
+        :param obj: object name
+        """
+        super(KeyMasterContext, self).__init__(keymaster.app)
+        self.keymaster = keymaster
+        self.account = account
+        self.container = container
+        self.obj = obj
+        self._keys = None
+
+    def fetch_crypto_keys(self, *args, **kwargs):
+        """
+        Setup container and object keys based on the request path.
+
+        Keys are derived from request path. The 'id' entry in the results dict
+        includes the part of the path used to derive keys. Other keymaster
+        implementations may use a different strategy to generate keys and may
+        include a different type of 'id', so callers should treat the 'id' as
+        opaque keymaster-specific data.
+
+        :returns: A dict containing encryption keys for 'object' and
+                  'container' and a key 'id'.
+        """
+        if self._keys:
+            return self._keys
+
+        self._keys = {}
+        account_path = os.path.join(os.sep, self.account)
+
+        if self.container:
+            path = os.path.join(account_path, self.container)
+            self._keys['container'] = self.keymaster.create_key(path)
+
+            if self.obj:
+                path = os.path.join(path, self.obj)
+                self._keys['object'] = self.keymaster.create_key(path)
+
+            # For future-proofing include a keymaster version number and the
+            # path used to derive keys in the 'id' entry of the results. The
+            # encrypter will persist this as part of the crypto-meta for
+            # encrypted data and metadata. If we ever change the way keys are
+            # generated then the decrypter could pass the persisted 'id' value
+            # when it calls fetch_crypto_keys to inform the keymaster as to how
+            # that particular data or metadata had its keys generated.
+            # Currently we have no need to do that, so we are simply persisting
+            # this information for future use.
+            self._keys['id'] = {'v': '1', 'path': path}
+
+        return self._keys
+
+    def handle_request(self, req, start_response):
+        req.environ[CRYPTO_KEY_CALLBACK] = self.fetch_crypto_keys
+        resp = self._app_call(req.environ)
+        start_response(self._response_status, self._response_headers,
+                       self._response_exc_info)
+        return resp
+
+
+class KeyMaster(object):
+    """Middleware for providing encryption keys.
+
+    The middleware requires its ``encryption_root_secret`` option to be set.
+    This is the root secret from which encryption keys are derived. This must
+    be set before first use to a value that is a base64 encoding of at least 32
+    bytes. The security of all encrypted data critically depends on this key,
+    therefore it should be set to a high-entropy value. For example, a suitable
+    value may be obtained by base-64 encoding a 32 byte (or longer) value
+    generated by a cryptographically secure random number generator. Changing
+    the root secret is likely to result in data loss.
+    """
+
+    def __init__(self, app, conf):
+        self.app = app
+        self.root_secret = conf.get('encryption_root_secret')
+        try:
+            self.root_secret = base64.b64decode(self.root_secret)
+            if len(self.root_secret) < 32:
+                raise ValueError
+        except (TypeError, ValueError):
+            raise ValueError(
+                'encryption_root_secret option in proxy-server.conf must be '
+                'a base64 encoding of at least 32 raw bytes')
+
+    def __call__(self, env, start_response):
+        req = Request(env)
+
+        try:
+            parts = req.split_path(2, 4, True)
+        except ValueError:
+            return self.app(env, start_response)
+
+        if req.method in ('PUT', 'POST', 'GET', 'HEAD'):
+            # handle only those request methods that may require keys
+            km_context = KeyMasterContext(self, *parts[1:])
+            try:
+                return km_context.handle_request(req, start_response)
+            except HTTPException as err_resp:
+                return err_resp(env, start_response)
+
+        # anything else
+        return self.app(env, start_response)
+
+    def create_key(self, key_id):
+        return hmac.new(self.root_secret, key_id,
+                        digestmod=hashlib.sha256).digest()
+
+
+def filter_factory(global_conf, **local_conf):
+    conf = global_conf.copy()
+    conf.update(local_conf)
+
+    def keymaster_filter(app):
+        return KeyMaster(app, conf)
+
+    return keymaster_filter

swift/common/swob.py

@@ -1419,6 +1419,7 @@ HTTPOk = status_map[200]
 HTTPCreated = status_map[201]
 HTTPAccepted = status_map[202]
 HTTPNoContent = status_map[204]
+HTTPPartialContent = status_map[206]
 HTTPMovedPermanently = status_map[301]
 HTTPFound = status_map[302]
 HTTPSeeOther = status_map[303]

test/functional/__init__.py

@@ -361,6 +361,12 @@ def in_process_setup(the_object_server=object_server):
         'allow_account_management': 'true',
         'account_autocreate': 'true',
         'allow_versions': 'True',
+        # TODO - Remove encryption_root_secret - this is only necessary while
+        # encryption middleware is in the default proxy pipeline in
+        # proxy-server.conf-sample
+        # base64 encoding of "dontEverUseThisIn_PRODUCTION_xxxxxxxxxxxxxxx"
+        'encryption_root_secret':
+            'ZG9udEV2ZXJVc2VUaGlzSW5fUFJPRFVDVElPTl94eHh4eHh4eHh4eHh4eHg=',
         # Below are values used by the functional test framework, as well as
         # by the various in-process swift servers
         'auth_host': '127.0.0.1',

test/probe/test_empty_device_handoff.py

@@ -73,6 +73,13 @@ class TestEmptyDevice(ReplProbeTest):
             raise Exception('Object GET did not return VERIFY, instead it '
                             'returned: %s' % repr(odata))
 
+        # Stash the on disk data from a primary for future comparison with the
+        # handoff - this may not equal 'VERIFY' if for example the proxy has
+        # crypto enabled
+        direct_get_data = direct_client.direct_get_object(
+            onodes[1], opart, self.account, container, obj, headers={
+                'X-Backend-Storage-Policy-Index': self.policy.idx})[-1]
+
         # Kill other two container/obj primary servers
         #  to ensure GET handoff works
         for node in onodes[1:]:
@@ -95,9 +102,7 @@ class TestEmptyDevice(ReplProbeTest):
         odata = direct_client.direct_get_object(
             another_onode, opart, self.account, container, obj,
             headers={'X-Backend-Storage-Policy-Index': self.policy.idx})[-1]
-        if odata != 'VERIFY':
-            raise Exception('Direct object GET did not return VERIFY, instead '
-                            'it returned: %s' % repr(odata))
+        self.assertEqual(direct_get_data, odata)
 
         # Assert container listing (via proxy and directly) has container/obj
         objs = [o['name'] for o in
@@ -155,9 +160,7 @@ class TestEmptyDevice(ReplProbeTest):
         odata = direct_client.direct_get_object(
             onode, opart, self.account, container, obj, headers={
                 'X-Backend-Storage-Policy-Index': self.policy.idx})[-1]
-        if odata != 'VERIFY':
-            raise Exception('Direct object GET did not return VERIFY, instead '
-                            'it returned: %s' % repr(odata))
+        self.assertEqual(direct_get_data, odata)
 
         # Assert the handoff server no longer has container/obj
         try:

test/probe/test_object_failures.py

@@ -77,6 +77,12 @@ class TestObjectFailures(ReplProbeTest):
         obj = 'object-%s' % uuid4()
         onode, opart, data_file = self._setup_data_file(container, obj,
                                                         'VERIFY')
+        # Stash the on disk data for future comparison - this may not equal
+        # 'VERIFY' if for example the proxy has crypto enabled
+        backend_data = direct_client.direct_get_object(
+            onode, opart, self.account, container, obj, headers={
+                'X-Backend-Storage-Policy-Index': self.policy.idx})[-1]
+
         metadata = read_metadata(data_file)
         metadata['ETag'] = 'badetag'
         write_metadata(data_file, metadata)
@@ -84,7 +90,7 @@ class TestObjectFailures(ReplProbeTest):
         odata = direct_client.direct_get_object(
             onode, opart, self.account, container, obj, headers={
                 'X-Backend-Storage-Policy-Index': self.policy.idx})[-1]
-        self.assertEqual(odata, 'VERIFY')
+        self.assertEqual(odata, backend_data)
         try:
             direct_client.direct_get_object(
                 onode, opart, self.account, container, obj, headers={
@@ -98,14 +104,19 @@ class TestObjectFailures(ReplProbeTest):
         obj = 'object-range-%s' % uuid4()
         onode, opart, data_file = self._setup_data_file(container, obj,
                                                         'RANGE')
+        # Stash the on disk data for future comparison - this may not equal
+        # 'VERIFY' if for example the proxy has crypto enabled
+        backend_data = direct_client.direct_get_object(
+            onode, opart, self.account, container, obj, headers={
+                'X-Backend-Storage-Policy-Index': self.policy.idx})[-1]
 
         metadata = read_metadata(data_file)
         metadata['ETag'] = 'badetag'
         write_metadata(data_file, metadata)
         base_headers = {'X-Backend-Storage-Policy-Index': self.policy.idx}
-        for header, result in [({'Range': 'bytes=0-2'}, 'RAN'),
-                               ({'Range': 'bytes=1-11'}, 'ANGE'),
-                               ({'Range': 'bytes=0-11'}, 'RANGE')]:
+        for header, result in [({'Range': 'bytes=0-2'}, backend_data[0:3]),
+                               ({'Range': 'bytes=1-11'}, backend_data[1:]),
+                               ({'Range': 'bytes=0-11'}, backend_data)]:
             req_headers = base_headers.copy()
             req_headers.update(header)
             odata = direct_client.direct_get_object(

test/probe/test_object_handoff.py

@@ -55,6 +55,13 @@ class TestObjectHandoff(ReplProbeTest):
             raise Exception('Object GET did not return VERIFY, instead it '
                             'returned: %s' % repr(odata))
 
+        # Stash the on disk data from a primary for future comparison with the
+        # handoff - this may not equal 'VERIFY' if for example the proxy has
+        # crypto enabled
+        direct_get_data = direct_client.direct_get_object(
+            onodes[1], opart, self.account, container, obj, headers={
+                'X-Backend-Storage-Policy-Index': self.policy.idx})[-1]
+
         # Kill other two container/obj primary servers
         #   to ensure GET handoff works
         for node in onodes[1:]:
@@ -76,9 +83,7 @@ class TestObjectHandoff(ReplProbeTest):
         odata = direct_client.direct_get_object(
             another_onode, opart, self.account, container, obj, headers={
                 'X-Backend-Storage-Policy-Index': self.policy.idx})[-1]
-        if odata != 'VERIFY':
-            raise Exception('Direct object GET did not return VERIFY, instead '
-                            'it returned: %s' % repr(odata))
+        self.assertEqual(direct_get_data, odata)
 
         # drop a tempfile in the handoff's datadir, like it might have
         # had if there was an rsync failure while it was previously a
@@ -143,9 +148,7 @@ class TestObjectHandoff(ReplProbeTest):
         odata = direct_client.direct_get_object(
             onode, opart, self.account, container, obj, headers={
                 'X-Backend-Storage-Policy-Index': self.policy.idx})[-1]
-        if odata != 'VERIFY':
-            raise Exception('Direct object GET did not return VERIFY, instead '
-                            'it returned: %s' % repr(odata))
+        self.assertEqual(direct_get_data, odata)
 
         # and that it does *not* have a temporary rsync dropping!
         found_data_filename = False
@@ -273,6 +276,14 @@ class TestECObjectHandoffOverwrite(ECProbeTest):
         # shutdown one of the primary data nodes
         failed_primary = random.choice(onodes)
         failed_primary_device_path = self.device_dir('object', failed_primary)
+        # first read its ec etag value for future reference - this may not
+        # equal old_contents.etag if for example the proxy has crypto enabled
+        req_headers = {'X-Backend-Storage-Policy-Index': int(self.policy)}
+        headers = direct_client.direct_head_object(
+            failed_primary, opart, self.account, container_name,
+            object_name, headers=req_headers)
+        old_backend_etag = headers['X-Object-Sysmeta-EC-Etag']
+
         self.kill_drive(failed_primary_device_path)
 
         # overwrite our object with some new data
@@ -290,13 +301,18 @@ class TestECObjectHandoffOverwrite(ECProbeTest):
             failed_primary, opart, self.account, container_name,
             object_name, headers=req_headers)
         self.assertEqual(headers['X-Object-Sysmeta-EC-Etag'],
-                         old_contents.etag)
+                         old_backend_etag)
 
         # we have 1 primary with wrong old etag, and we should have 5 with
         # new etag plus a handoff with the new etag, so killing 2 other
         # primaries forces proxy to try to GET from all primaries plus handoff.
         other_nodes = [n for n in onodes if n != failed_primary]
         random.shuffle(other_nodes)
+        # grab the value of the new content's ec etag for future reference
+        headers = direct_client.direct_head_object(
+            other_nodes[0], opart, self.account, container_name,
+            object_name, headers=req_headers)
+        new_backend_etag = headers['X-Object-Sysmeta-EC-Etag']
         for node in other_nodes[:2]:
             self.kill_drive(self.device_dir('object', node))
 
@@ -314,8 +330,8 @@ class TestECObjectHandoffOverwrite(ECProbeTest):
                 continue
             found_frags[headers['X-Object-Sysmeta-EC-Etag']] += 1
         self.assertEqual(found_frags, {
-            new_contents.etag: 4,  # this should be enough to rebuild!
-            old_contents.etag: 1,
+            new_backend_etag: 4,  # this should be enough to rebuild!
+            old_backend_etag: 1,
         })
 
         # clear node error limiting

test/unit/common/middleware/crypto/crypto_helpers.py

@@ -0,0 +1,54 @@
+# Copyright (c) 2015-2016 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import base64
+import hashlib
+
+from swift.common.middleware.crypto.crypto_utils import Crypto
+
+
+def fetch_crypto_keys():
+    return {'account': 'This is an account key 012345678',
+            'container': 'This is a container key 01234567',
+            'object': 'This is an object key 0123456789',
+            'id': {'v': 'fake', 'path': '/a/c/fake'}}
+
+
+def md5hex(s):
+    return hashlib.md5(s).hexdigest()
+
+
+def encrypt(val, key=None, iv=None, ctxt=None):
+    if ctxt is None:
+        ctxt = Crypto({}).create_encryption_ctxt(key, iv)
+    enc_val = ctxt.update(val)
+    return enc_val
+
+
+def decrypt(key, iv, enc_val):
+    dec_ctxt = Crypto({}).create_decryption_ctxt(key, iv, 0)
+    dec_val = dec_ctxt.update(enc_val)
+    return dec_val
+
+
+FAKE_IV = "This is an IV123"
+# do not use this example encryption_root_secret in production, use a randomly
+# generated value with high entropy
+TEST_KEYMASTER_CONF = {'encryption_root_secret': base64.b64encode(b'x' * 32)}
+
+
+def fake_get_crypto_meta(**kwargs):
+    meta = {'iv': FAKE_IV, 'cipher': Crypto.cipher}
+    meta.update(kwargs)
+    return meta

test/unit/common/middleware/crypto/test_crypto.py

@@ -0,0 +1,39 @@
+# Copyright (c) 2016 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import unittest
+
+from swift.common import utils
+from swift.common.middleware import crypto
+
+
+class TestCrypto(unittest.TestCase):
+    def test_filter_factory(self):
+        factory = crypto.filter_factory({})
+        self.assertTrue(callable(factory))
+        self.assertIsInstance(factory({}), crypto.decrypter.Decrypter)
+        self.assertIsInstance(factory({}).app, crypto.encrypter.Encrypter)
+        self.assertIn('encryption', utils._swift_admin_info)
+        self.assertDictEqual(
+            {'enabled': True}, utils._swift_admin_info['encryption'])
+        self.assertNotIn('encryption', utils._swift_info)
+
+        factory = crypto.filter_factory({'disable_encryption': True})
+        self.assertTrue(callable(factory))
+        self.assertIsInstance(factory({}), crypto.decrypter.Decrypter)
+        self.assertIsInstance(factory({}).app, crypto.encrypter.Encrypter)
+        self.assertIn('encryption', utils._swift_admin_info)
+        self.assertDictEqual(
+            {'enabled': False}, utils._swift_admin_info['encryption'])
+        self.assertNotIn('encryption', utils._swift_info)

test/unit/common/middleware/crypto/test_crypto_utils.py

@@ -0,0 +1,495 @@
+# Copyright (c) 2015-2016 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import os
+import unittest
+
+import mock
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
+
+from swift.common.exceptions import EncryptionException
+from swift.common.middleware.crypto import crypto_utils
+from swift.common.middleware.crypto.crypto_utils import (
+    CRYPTO_KEY_CALLBACK, Crypto, CryptoWSGIContext)
+from swift.common.swob import HTTPException
+from test.unit import FakeLogger
+from test.unit.common.middleware.crypto.crypto_helpers import fetch_crypto_keys
+
+
+class TestCryptoWsgiContext(unittest.TestCase):
+    def setUp(self):
+        class FakeFilter(object):
+            app = None
+            crypto = Crypto({})
+
+        self.fake_logger = FakeLogger()
+        self.crypto_context = CryptoWSGIContext(
+            FakeFilter(), 'object', self.fake_logger)
+
+    def test_get_keys(self):
+        # ok
+        env = {CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        keys = self.crypto_context.get_keys(env)
+        self.assertDictEqual(fetch_crypto_keys(), keys)
+
+        # only default required keys are checked
+        subset_keys = {'object': fetch_crypto_keys()['object']}
+        env = {CRYPTO_KEY_CALLBACK: lambda: subset_keys}
+        keys = self.crypto_context.get_keys(env)
+        self.assertDictEqual(subset_keys, keys)
+
+        # only specified required keys are checked
+        subset_keys = {'container': fetch_crypto_keys()['container']}
+        env = {CRYPTO_KEY_CALLBACK: lambda: subset_keys}
+        keys = self.crypto_context.get_keys(env, required=['container'])
+        self.assertDictEqual(subset_keys, keys)
+
+        subset_keys = {'object': fetch_crypto_keys()['object'],
+                       'container': fetch_crypto_keys()['container']}
+        env = {CRYPTO_KEY_CALLBACK: lambda: subset_keys}
+        keys = self.crypto_context.get_keys(
+            env, required=['object', 'container'])
+        self.assertDictEqual(subset_keys, keys)
+
+    def test_get_keys_missing_callback(self):
+        with self.assertRaises(HTTPException) as cm:
+            self.crypto_context.get_keys({})
+        self.assertIn('500 Internal Error', cm.exception.message)
+        self.assertIn('missing callback',
+                      self.fake_logger.get_lines_for_level('error')[0])
+        self.assertIn('Unable to retrieve encryption keys.', cm.exception.body)
+
+    def test_get_keys_callback_exception(self):
+        def callback():
+            raise Exception('boom')
+        with self.assertRaises(HTTPException) as cm:
+            self.crypto_context.get_keys({CRYPTO_KEY_CALLBACK: callback})
+        self.assertIn('500 Internal Error', cm.exception.message)
+        self.assertIn('from callback: boom',
+                      self.fake_logger.get_lines_for_level('error')[0])
+        self.assertIn('Unable to retrieve encryption keys.', cm.exception.body)
+
+    def test_get_keys_missing_key_for_default_required_list(self):
+        bad_keys = dict(fetch_crypto_keys())
+        bad_keys.pop('object')
+        with self.assertRaises(HTTPException) as cm:
+            self.crypto_context.get_keys(
+                {CRYPTO_KEY_CALLBACK: lambda: bad_keys})
+        self.assertIn('500 Internal Error', cm.exception.message)
+        self.assertIn("Missing key for 'object'",
+                      self.fake_logger.get_lines_for_level('error')[0])
+        self.assertIn('Unable to retrieve encryption keys.', cm.exception.body)
+
+    def test_get_keys_missing_object_key_for_specified_required_list(self):
+        bad_keys = dict(fetch_crypto_keys())
+        bad_keys.pop('object')
+        with self.assertRaises(HTTPException) as cm:
+            self.crypto_context.get_keys(
+                {CRYPTO_KEY_CALLBACK: lambda: bad_keys},
+                required=['object', 'container'])
+        self.assertIn('500 Internal Error', cm.exception.message)
+        self.assertIn("Missing key for 'object'",
+                      self.fake_logger.get_lines_for_level('error')[0])
+        self.assertIn('Unable to retrieve encryption keys.', cm.exception.body)
+
+    def test_get_keys_missing_container_key_for_specified_required_list(self):
+        bad_keys = dict(fetch_crypto_keys())
+        bad_keys.pop('container')
+        with self.assertRaises(HTTPException) as cm:
+            self.crypto_context.get_keys(
+                {CRYPTO_KEY_CALLBACK: lambda: bad_keys},
+                required=['object', 'container'])
+        self.assertIn('500 Internal Error', cm.exception.message)
+        self.assertIn("Missing key for 'container'",
+                      self.fake_logger.get_lines_for_level('error')[0])
+        self.assertIn('Unable to retrieve encryption keys.', cm.exception.body)
+
+    def test_bad_object_key_for_default_required_list(self):
+        bad_keys = dict(fetch_crypto_keys())
+        bad_keys['object'] = 'the minor key'
+        with self.assertRaises(HTTPException) as cm:
+            self.crypto_context.get_keys(
+                {CRYPTO_KEY_CALLBACK: lambda: bad_keys})
+        self.assertIn('500 Internal Error', cm.exception.message)
+        self.assertIn("Bad key for 'object'",
+                      self.fake_logger.get_lines_for_level('error')[0])
+        self.assertIn('Unable to retrieve encryption keys.', cm.exception.body)
+
+    def test_bad_container_key_for_default_required_list(self):
+        bad_keys = dict(fetch_crypto_keys())
+        bad_keys['container'] = 'the major key'
+        with self.assertRaises(HTTPException) as cm:
+            self.crypto_context.get_keys(
+                {CRYPTO_KEY_CALLBACK: lambda: bad_keys},
+                required=['object', 'container'])
+        self.assertIn('500 Internal Error', cm.exception.message)
+        self.assertIn("Bad key for 'container'",
+                      self.fake_logger.get_lines_for_level('error')[0])
+        self.assertIn('Unable to retrieve encryption keys.', cm.exception.body)
+
+    def test_get_keys_not_a_dict(self):
+        with self.assertRaises(HTTPException) as cm:
+            self.crypto_context.get_keys(
+                {CRYPTO_KEY_CALLBACK: lambda: ['key', 'quay', 'qui']})
+        self.assertIn('500 Internal Error', cm.exception.message)
+        self.assertIn("Did not get a keys dict",
+                      self.fake_logger.get_lines_for_level('error')[0])
+        self.assertIn('Unable to retrieve encryption keys.', cm.exception.body)
+
+
+class TestModuleMethods(unittest.TestCase):
+    meta = {'iv': '0123456789abcdef', 'cipher': 'AES_CTR_256'}
+    serialized_meta = '%7B%22cipher%22%3A+%22AES_CTR_256%22%2C+%22' \
+                      'iv%22%3A+%22MDEyMzQ1Njc4OWFiY2RlZg%3D%3D%22%7D'
+
+    meta_with_key = {'iv': '0123456789abcdef', 'cipher': 'AES_CTR_256',
+                     'body_key': {'key': 'fedcba9876543210fedcba9876543210',
+                                  'iv': 'fedcba9876543210'}}
+    serialized_meta_with_key = '%7B%22body_key%22%3A+%7B%22iv%22%3A+%22ZmVkY' \
+                               '2JhOTg3NjU0MzIxMA%3D%3D%22%2C+%22key%22%3A+%' \
+                               '22ZmVkY2JhOTg3NjU0MzIxMGZlZGNiYTk4NzY1NDMyMT' \
+                               'A%3D%22%7D%2C+%22cipher%22%3A+%22AES_CTR_256' \
+                               '%22%2C+%22iv%22%3A+%22MDEyMzQ1Njc4OWFiY2RlZg' \
+                               '%3D%3D%22%7D'
+
+    def test_dump_crypto_meta(self):
+        actual = crypto_utils.dump_crypto_meta(self.meta)
+        self.assertEqual(self.serialized_meta, actual)
+
+        actual = crypto_utils.dump_crypto_meta(self.meta_with_key)
+        self.assertEqual(self.serialized_meta_with_key, actual)
+
+    def test_load_crypto_meta(self):
+        actual = crypto_utils.load_crypto_meta(self.serialized_meta)
+        self.assertEqual(self.meta, actual)
+
+        actual = crypto_utils.load_crypto_meta(self.serialized_meta_with_key)
+        self.assertEqual(self.meta_with_key, actual)
+
+        def assert_raises(value, message):
+            with self.assertRaises(EncryptionException) as cm:
+                crypto_utils.load_crypto_meta(value)
+            self.assertIn('Bad crypto meta %r' % value, cm.exception.message)
+            self.assertIn(message, cm.exception.message)
+
+        assert_raises(None, 'crypto meta not a string')
+        assert_raises(99, 'crypto meta not a string')
+        assert_raises('', 'No JSON object could be decoded')
+        assert_raises('abc', 'No JSON object could be decoded')
+        assert_raises('[]', 'crypto meta not a Mapping')
+        assert_raises('{"iv": "abcdef"}', 'Incorrect padding')
+        assert_raises('{"iv": []}', 'must be string or buffer')
+        assert_raises('{"iv": {}}', 'must be string or buffer')
+        assert_raises('{"iv": 99}', 'must be string or buffer')
+        assert_raises('{"key": "abcdef"}', 'Incorrect padding')
+        assert_raises('{"key": []}', 'must be string or buffer')
+        assert_raises('{"key": {}}', 'must be string or buffer')
+        assert_raises('{"key": 99}', 'must be string or buffer')
+        assert_raises('{"body_key": {"iv": "abcdef"}}', 'Incorrect padding')
+        assert_raises('{"body_key": {"iv": []}}', 'must be string or buffer')
+        assert_raises('{"body_key": {"iv": {}}}', 'must be string or buffer')
+        assert_raises('{"body_key": {"iv": 99}}', 'must be string or buffer')
+        assert_raises('{"body_key": {"key": "abcdef"}}', 'Incorrect padding')
+        assert_raises('{"body_key": {"key": []}}', 'must be string or buffer')
+        assert_raises('{"body_key": {"key": {}}}', 'must be string or buffer')
+        assert_raises('{"body_key": {"key": 99}}', 'must be string or buffer')
+
+    def test_dump_then_load_crypto_meta(self):
+        actual = crypto_utils.load_crypto_meta(
+            crypto_utils.dump_crypto_meta(self.meta))
+        self.assertEqual(self.meta, actual)
+
+        actual = crypto_utils.load_crypto_meta(
+            crypto_utils.dump_crypto_meta(self.meta_with_key))
+        self.assertEqual(self.meta_with_key, actual)
+
+    def test_append_crypto_meta(self):
+        actual = crypto_utils.append_crypto_meta('abc', self.meta)
+        expected = 'abc; swift_meta=%s' % self.serialized_meta
+        self.assertEqual(actual, expected)
+
+        actual = crypto_utils.append_crypto_meta('abc', self.meta_with_key)
+        expected = 'abc; swift_meta=%s' % self.serialized_meta_with_key
+        self.assertEqual(actual, expected)
+
+    def test_extract_crypto_meta(self):
+        val, meta = crypto_utils.extract_crypto_meta(
+            'abc; swift_meta=%s' % self.serialized_meta)
+        self.assertEqual('abc', val)
+        self.assertDictEqual(self.meta, meta)
+
+        val, meta = crypto_utils.extract_crypto_meta(
+            'abc; swift_meta=%s' % self.serialized_meta_with_key)
+        self.assertEqual('abc', val)
+        self.assertDictEqual(self.meta_with_key, meta)
+
+        val, meta = crypto_utils.extract_crypto_meta('abc')
+        self.assertEqual('abc', val)
+        self.assertIsNone(meta)
+
+        # other param names will be ignored
+        val, meta = crypto_utils.extract_crypto_meta('abc; foo=bar')
+        self.assertEqual('abc', val)
+        self.assertIsNone(meta)
+
+    def test_append_then_extract_crypto_meta(self):
+        val = 'abc'
+        actual = crypto_utils.extract_crypto_meta(
+            crypto_utils.append_crypto_meta(val, self.meta))
+        self.assertEqual((val, self.meta), actual)
+
+
+class TestCrypto(unittest.TestCase):
+
+    def setUp(self):
+        self.crypto = Crypto({})
+
+    def test_create_encryption_context(self):
+        value = 'encrypt me' * 100  # more than one cipher block
+        key = os.urandom(32)
+        iv = os.urandom(16)
+        ctxt = self.crypto.create_encryption_ctxt(key, iv)
+        expected = Cipher(
+            algorithms.AES(key), modes.CTR(iv),
+            backend=default_backend()).encryptor().update(value)
+        self.assertEqual(expected, ctxt.update(value))
+
+        for bad_iv in ('a little too long', 'too short'):
+            self.assertRaises(
+                ValueError, self.crypto.create_encryption_ctxt, key, bad_iv)
+
+        for bad_key in ('objKey', 'a' * 31, 'a' * 33, 'a' * 16, 'a' * 24):
+            self.assertRaises(
+                ValueError, self.crypto.create_encryption_ctxt, bad_key, iv)
+
+    def test_create_decryption_context(self):
+        value = 'decrypt me' * 100  # more than one cipher block
+        key = os.urandom(32)
+        iv = os.urandom(16)
+        ctxt = self.crypto.create_decryption_ctxt(key, iv, 0)
+        expected = Cipher(
+            algorithms.AES(key), modes.CTR(iv),
+            backend=default_backend()).decryptor().update(value)
+        self.assertEqual(expected, ctxt.update(value))
+
+        for bad_iv in ('a little too long', 'too short'):
+            self.assertRaises(
+                ValueError, self.crypto.create_decryption_ctxt, key, bad_iv, 0)
+
+        for bad_key in ('objKey', 'a' * 31, 'a' * 33, 'a' * 16, 'a' * 24):
+            self.assertRaises(
+                ValueError, self.crypto.create_decryption_ctxt, bad_key, iv, 0)
+
+        with self.assertRaises(ValueError) as cm:
+            self.crypto.create_decryption_ctxt(key, iv, -1)
+        self.assertEqual("Offset must not be negative", cm.exception.message)
+
+    def test_enc_dec_small_chunks(self):
+        self.enc_dec_chunks(['encrypt me', 'because I', 'am sensitive'])
+
+    def test_enc_dec_large_chunks(self):
+        self.enc_dec_chunks([os.urandom(65536), os.urandom(65536)])
+
+    def enc_dec_chunks(self, chunks):
+        key = 'objL7wjV6L79Sfs4y7dy41273l0k6Wki'
+        iv = self.crypto.create_iv()
+        enc_ctxt = self.crypto.create_encryption_ctxt(key, iv)
+        enc_val = [enc_ctxt.update(chunk) for chunk in chunks]
+        self.assertTrue(''.join(enc_val) != chunks)
+        dec_ctxt = self.crypto.create_decryption_ctxt(key, iv, 0)
+        dec_val = [dec_ctxt.update(chunk) for chunk in enc_val]
+        self.assertEqual(''.join(chunks), ''.join(dec_val),
+                         'Expected value {%s} but got {%s}' %
+                         (''.join(chunks), ''.join(dec_val)))
+
+    def test_decrypt_range(self):
+        chunks = ['0123456789abcdef', 'ghijklmnopqrstuv']
+        key = 'objL7wjV6L79Sfs4y7dy41273l0k6Wki'
+        iv = self.crypto.create_iv()
+        enc_ctxt = self.crypto.create_encryption_ctxt(key, iv)
+        enc_val = [enc_ctxt.update(chunk) for chunk in chunks]
+        self.assertTrue(''.join(enc_val) != chunks)
+
+        # Simulate a ranged GET from byte 19 to 32 : 'jklmnopqrstuv'
+        dec_ctxt = self.crypto.create_decryption_ctxt(key, iv, 19)
+        ranged_chunks = [enc_val[1][3:]]
+        dec_val = [dec_ctxt.update(chunk) for chunk in ranged_chunks]
+        self.assertEqual('jklmnopqrstuv', ''.join(dec_val),
+                         'Expected value {%s} but got {%s}' %
+                         ('jklmnopqrstuv', ''.join(dec_val)))
+
+    def test_create_decryption_context_non_zero_offset(self):
+        # Verify that iv increments for each 16 bytes of offset.
+        # For a ranged GET we pass a non-zero offset so that the decrypter
+        # counter is incremented to the correct value to start decrypting at
+        # that offset into the object body. The counter should increment by one
+        # from the starting IV value for every 16 bytes offset into the object
+        # body, until it reaches 2^128 -1 when it should wrap to zero. We check
+        # that is happening by verifying a decrypted value using various
+        # offsets.
+        key = 'objL7wjV6L79Sfs4y7dy41273l0k6Wki'
+
+        def do_test():
+            for offset, exp_iv in mappings.items():
+                dec_ctxt = self.crypto.create_decryption_ctxt(key, iv, offset)
+                offset_in_block = offset % 16
+                cipher = Cipher(algorithms.AES(key),
+                                modes.CTR(exp_iv),
+                                backend=default_backend())
+                expected = cipher.decryptor().update(
+                    'p' * offset_in_block + 'ciphertext')
+                actual = dec_ctxt.update('ciphertext')
+                expected = expected[offset % 16:]
+                self.assertEqual(expected, actual,
+                                 'Expected %r but got %r, iv=%s and offset=%s'
+                                 % (expected, actual, iv, offset))
+
+        iv = '0000000010000000'
+        mappings = {
+            2: '0000000010000000',
+            16: '0000000010000001',
+            19: '0000000010000001',
+            48: '0000000010000003',
+            1024: '000000001000000p',
+            5119: '000000001000001o'
+        }
+        do_test()
+
+        # choose max iv value and test that it wraps to zero
+        iv = chr(0xff) * 16
+        mappings = {
+            2: iv,
+            16: str(bytearray.fromhex('00' * 16)),  # iv wraps to 0
+            19: str(bytearray.fromhex('00' * 16)),
+            48: str(bytearray.fromhex('00' * 15 + '02')),
+            1024: str(bytearray.fromhex('00' * 15 + '3f')),
+            5119: str(bytearray.fromhex('00' * 14 + '013E'))
+        }
+        do_test()
+
+        iv = chr(0x0) * 16
+        mappings = {
+            2: iv,
+            16: str(bytearray.fromhex('00' * 15 + '01')),
+            19: str(bytearray.fromhex('00' * 15 + '01')),
+            48: str(bytearray.fromhex('00' * 15 + '03')),
+            1024: str(bytearray.fromhex('00' * 15 + '40')),
+            5119: str(bytearray.fromhex('00' * 14 + '013F'))
+        }
+        do_test()
+
+        iv = chr(0x0) * 8 + chr(0xff) * 8
+        mappings = {
+            2: iv,
+            16: str(bytearray.fromhex('00' * 7 + '01' + '00' * 8)),
+            19: str(bytearray.fromhex('00' * 7 + '01' + '00' * 8)),
+            48: str(bytearray.fromhex('00' * 7 + '01' + '00' * 7 + '02')),
+            1024: str(bytearray.fromhex('00' * 7 + '01' + '00' * 7 + '3F')),
+            5119: str(bytearray.fromhex('00' * 7 + '01' + '00' * 6 + '013E'))
+        }
+        do_test()
+
+    def test_check_key(self):
+        for key in ('objKey', 'a' * 31, 'a' * 33, 'a' * 16, 'a' * 24):
+            with self.assertRaises(ValueError) as cm:
+                self.crypto.check_key(key)
+            self.assertEqual("Key must be length 32 bytes",
+                             cm.exception.message)
+
+    def test_check_crypto_meta(self):
+        meta = {'cipher': 'AES_CTR_256'}
+        with self.assertRaises(EncryptionException) as cm:
+            self.crypto.check_crypto_meta(meta)
+        self.assertEqual("Bad crypto meta: Missing 'iv'",
+                         cm.exception.message)
+
+        for bad_iv in ('a little too long', 'too short'):
+            meta['iv'] = bad_iv
+            with self.assertRaises(EncryptionException) as cm:
+                self.crypto.check_crypto_meta(meta)
+            self.assertEqual("Bad crypto meta: IV must be length 16 bytes",
+                             cm.exception.message)
+
+        meta = {'iv': os.urandom(16)}
+        with self.assertRaises(EncryptionException) as cm:
+            self.crypto.check_crypto_meta(meta)
+        self.assertEqual("Bad crypto meta: Missing 'cipher'",
+                         cm.exception.message)
+
+        meta['cipher'] = 'Mystery cipher'
+        with self.assertRaises(EncryptionException) as cm:
+            self.crypto.check_crypto_meta(meta)
+        self.assertEqual("Bad crypto meta: Cipher must be AES_CTR_256",
+                         cm.exception.message)
+
+    def test_create_iv(self):
+        self.assertEqual(16, len(self.crypto.create_iv()))
+        # crude check that we get back different values on each call
+        self.assertNotEqual(self.crypto.create_iv(), self.crypto.create_iv())
+
+    def test_get_crypto_meta(self):
+        meta = self.crypto.create_crypto_meta()
+        self.assertIsInstance(meta, dict)
+        # this is deliberately brittle so that if new items are added then the
+        # test will need to be updated
+        self.assertEqual(2, len(meta))
+        self.assertIn('iv', meta)
+        self.assertEqual(16, len(meta['iv']))
+        self.assertIn('cipher', meta)
+        self.assertEqual('AES_CTR_256', meta['cipher'])
+        self.crypto.check_crypto_meta(meta)  # sanity check
+        meta2 = self.crypto.create_crypto_meta()
+        self.assertNotEqual(meta['iv'], meta2['iv'])  # crude sanity check
+
+    def test_create_random_key(self):
+        # crude check that we get unique keys on each call
+        keys = set()
+        for i in range(10):
+            key = self.crypto.create_random_key()
+            self.assertEqual(32, len(key))
+            keys.add(key)
+        self.assertEqual(10, len(keys))
+
+    def test_wrap_unwrap_key(self):
+        wrapping_key = os.urandom(32)
+        key_to_wrap = os.urandom(32)
+        iv = os.urandom(16)
+        with mock.patch(
+                'swift.common.middleware.crypto.crypto_utils.Crypto.create_iv',
+                return_value=iv):
+            wrapped = self.crypto.wrap_key(wrapping_key, key_to_wrap)
+        cipher = Cipher(algorithms.AES(wrapping_key), modes.CTR(iv),
+                        backend=default_backend())
+        expected = {'key': cipher.encryptor().update(key_to_wrap),
+                    'iv': iv}
+        self.assertEqual(expected, wrapped)
+
+        unwrapped = self.crypto.unwrap_key(wrapping_key, wrapped)
+        self.assertEqual(key_to_wrap, unwrapped)
+
+    def test_unwrap_bad_key(self):
+        # verify that ValueError is raised if unwrapped key is invalid
+        wrapping_key = os.urandom(32)
+        for length in (0, 16, 24, 31, 33):
+            key_to_wrap = os.urandom(length)
+            wrapped = self.crypto.wrap_key(wrapping_key, key_to_wrap)
+            with self.assertRaises(ValueError) as cm:
+                self.crypto.unwrap_key(wrapping_key, wrapped)
+            self.assertEqual(
+                cm.exception.message, 'Key must be length 32 bytes')
+
+
+if __name__ == '__main__':
+    unittest.main()

test/unit/common/middleware/crypto/test_encrypter.py

@@ -0,0 +1,820 @@
+# Copyright (c) 2015-2016 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import base64
+import hashlib
+import hmac
+import json
+import os
+import unittest
+import urllib
+
+import mock
+
+from swift.common.middleware.crypto import encrypter
+from swift.common.middleware.crypto.crypto_utils import (
+    CRYPTO_KEY_CALLBACK, Crypto)
+from swift.common.swob import (
+    Request, HTTPException, HTTPCreated, HTTPAccepted, HTTPOk, HTTPBadRequest)
+from swift.common.utils import FileLikeIter
+
+from test.unit import FakeLogger, EMPTY_ETAG
+from test.unit.common.middleware.crypto.crypto_helpers import (
+    fetch_crypto_keys, md5hex, FAKE_IV, encrypt)
+from test.unit.common.middleware.helpers import FakeSwift, FakeAppThatExcepts
+
+
+@mock.patch('swift.common.middleware.crypto.crypto_utils.Crypto.create_iv',
+            lambda *args: FAKE_IV)
+class TestEncrypter(unittest.TestCase):
+    def setUp(self):
+        self.app = FakeSwift()
+        self.encrypter = encrypter.Encrypter(self.app, {})
+        self.encrypter.logger = FakeLogger()
+
+    def _verify_user_metadata(self, req_hdrs, name, value, key):
+        # verify encrypted version of user metadata
+        self.assertNotIn('X-Object-Meta-' + name, req_hdrs)
+        expected_hdr = 'X-Object-Transient-Sysmeta-Crypto-Meta-' + name
+        self.assertIn(expected_hdr, req_hdrs)
+        enc_val, param = req_hdrs[expected_hdr].split(';')
+        param = param.strip()
+        self.assertTrue(param.startswith('swift_meta='))
+        actual_meta = json.loads(
+            urllib.unquote_plus(param[len('swift_meta='):]))
+        self.assertEqual(Crypto.cipher, actual_meta['cipher'])
+        meta_iv = base64.b64decode(actual_meta['iv'])
+        self.assertEqual(FAKE_IV, meta_iv)
+        self.assertEqual(
+            base64.b64encode(encrypt(value, key, meta_iv)),
+            enc_val)
+        # if there is any encrypted user metadata then this header should exist
+        self.assertIn('X-Object-Transient-Sysmeta-Crypto-Meta', req_hdrs)
+        common_meta = json.loads(urllib.unquote_plus(
+            req_hdrs['X-Object-Transient-Sysmeta-Crypto-Meta']))
+        self.assertDictEqual({'cipher': Crypto.cipher,
+                              'key_id': {'v': 'fake', 'path': '/a/c/fake'}},
+                             common_meta)
+
+    def test_PUT_req(self):
+        body_key = os.urandom(32)
+        object_key = fetch_crypto_keys()['object']
+        plaintext = 'FAKE APP'
+        plaintext_etag = md5hex(plaintext)
+        ciphertext = encrypt(plaintext, body_key, FAKE_IV)
+        ciphertext_etag = md5hex(ciphertext)
+
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        hdrs = {'etag': plaintext_etag,
+                'content-type': 'text/plain',
+                'content-length': str(len(plaintext)),
+                'x-object-meta-etag': 'not to be confused with the Etag!',
+                'x-object-meta-test': 'encrypt me',
+                'x-object-sysmeta-test': 'do not encrypt me'}
+        req = Request.blank(
+            '/v1/a/c/o', environ=env, body=plaintext, headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated, {})
+        with mock.patch(
+            'swift.common.middleware.crypto.crypto_utils.'
+            'Crypto.create_random_key',
+                return_value=body_key):
+            resp = req.get_response(self.encrypter)
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual(plaintext_etag, resp.headers['Etag'])
+
+        # verify metadata items
+        self.assertEqual(1, len(self.app.calls), self.app.calls)
+        self.assertEqual('PUT', self.app.calls[0][0])
+        req_hdrs = self.app.headers[0]
+
+        # verify body crypto meta
+        actual = req_hdrs['X-Object-Sysmeta-Crypto-Body-Meta']
+        actual = json.loads(urllib.unquote_plus(actual))
+        self.assertEqual(Crypto().cipher, actual['cipher'])
+        self.assertEqual(FAKE_IV, base64.b64decode(actual['iv']))
+
+        # verify wrapped body key
+        expected_wrapped_key = encrypt(body_key, object_key, FAKE_IV)
+        self.assertEqual(expected_wrapped_key,
+                         base64.b64decode(actual['body_key']['key']))
+        self.assertEqual(FAKE_IV,
+                         base64.b64decode(actual['body_key']['iv']))
+        self.assertEqual(fetch_crypto_keys()['id'], actual['key_id'])
+
+        # verify etag
+        self.assertEqual(ciphertext_etag, req_hdrs['Etag'])
+
+        encrypted_etag, _junk, etag_meta = \
+            req_hdrs['X-Object-Sysmeta-Crypto-Etag'].partition('; swift_meta=')
+        # verify crypto_meta was appended to this etag
+        self.assertTrue(etag_meta)
+        actual_meta = json.loads(urllib.unquote_plus(etag_meta))
+        self.assertEqual(Crypto().cipher, actual_meta['cipher'])
+
+        # verify encrypted version of plaintext etag
+        actual = base64.b64decode(encrypted_etag)
+        etag_iv = base64.b64decode(actual_meta['iv'])
+        enc_etag = encrypt(plaintext_etag, object_key, etag_iv)
+        self.assertEqual(enc_etag, actual)
+
+        # verify etag MAC for conditional requests
+        actual_hmac = base64.b64decode(
+            req_hdrs['X-Object-Sysmeta-Crypto-Etag-Mac'])
+        self.assertEqual(actual_hmac, hmac.new(
+            object_key, plaintext_etag, hashlib.sha256).digest())
+
+        # verify encrypted etag for container update
+        self.assertIn(
+            'X-Object-Sysmeta-Container-Update-Override-Etag', req_hdrs)
+        parts = req_hdrs[
+            'X-Object-Sysmeta-Container-Update-Override-Etag'].rsplit(';', 1)
+        self.assertEqual(2, len(parts))
+
+        # extract crypto_meta from end of etag for container update
+        param = parts[1].strip()
+        crypto_meta_tag = 'swift_meta='
+        self.assertTrue(param.startswith(crypto_meta_tag), param)
+        actual_meta = json.loads(
+            urllib.unquote_plus(param[len(crypto_meta_tag):]))
+        self.assertEqual(Crypto().cipher, actual_meta['cipher'])
+        self.assertEqual(fetch_crypto_keys()['id'], actual_meta['key_id'])
+
+        cont_key = fetch_crypto_keys()['container']
+        cont_etag_iv = base64.b64decode(actual_meta['iv'])
+        self.assertEqual(FAKE_IV, cont_etag_iv)
+        self.assertEqual(encrypt(plaintext_etag, cont_key, cont_etag_iv),
+                         base64.b64decode(parts[0]))
+
+        # content-type is not encrypted
+        self.assertEqual('text/plain', req_hdrs['Content-Type'])
+
+        # user meta is encrypted
+        self._verify_user_metadata(req_hdrs, 'Test', 'encrypt me', object_key)
+        self._verify_user_metadata(
+            req_hdrs, 'Etag', 'not to be confused with the Etag!', object_key)
+
+        # sysmeta is not encrypted
+        self.assertEqual('do not encrypt me',
+                         req_hdrs['X-Object-Sysmeta-Test'])
+
+        # verify object is encrypted by getting direct from the app
+        get_req = Request.blank('/v1/a/c/o', environ={'REQUEST_METHOD': 'GET'})
+        resp = get_req.get_response(self.app)
+        self.assertEqual(ciphertext, resp.body)
+        self.assertEqual(ciphertext_etag, resp.headers['Etag'])
+
+    def test_PUT_zero_size_object(self):
+        # object body encryption should be skipped for zero sized object body
+        object_key = fetch_crypto_keys()['object']
+        plaintext_etag = EMPTY_ETAG
+
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        hdrs = {'etag': EMPTY_ETAG,
+                'content-type': 'text/plain',
+                'content-length': '0',
+                'x-object-meta-etag': 'not to be confused with the Etag!',
+                'x-object-meta-test': 'encrypt me',
+                'x-object-sysmeta-test': 'do not encrypt me'}
+        req = Request.blank(
+            '/v1/a/c/o', environ=env, body='', headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated, {})
+
+        resp = req.get_response(self.encrypter)
+
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual(plaintext_etag, resp.headers['Etag'])
+        self.assertEqual(1, len(self.app.calls), self.app.calls)
+        self.assertEqual('PUT', self.app.calls[0][0])
+        req_hdrs = self.app.headers[0]
+
+        # verify that there is no body crypto meta
+        self.assertNotIn('X-Object-Sysmeta-Crypto-Meta', req_hdrs)
+        # verify etag is md5 of plaintext
+        self.assertEqual(EMPTY_ETAG, req_hdrs['Etag'])
+        # verify there is no etag crypto meta
+        self.assertNotIn('X-Object-Sysmeta-Crypto-Etag', req_hdrs)
+        # verify there is no container update override for etag
+        self.assertNotIn(
+            'X-Object-Sysmeta-Container-Update-Override-Etag', req_hdrs)
+
+        # user meta is still encrypted
+        self._verify_user_metadata(req_hdrs, 'Test', 'encrypt me', object_key)
+        self._verify_user_metadata(
+            req_hdrs, 'Etag', 'not to be confused with the Etag!', object_key)
+
+        # sysmeta is not encrypted
+        self.assertEqual('do not encrypt me',
+                         req_hdrs['X-Object-Sysmeta-Test'])
+
+        # verify object is empty by getting direct from the app
+        get_req = Request.blank('/v1/a/c/o', environ={'REQUEST_METHOD': 'GET'})
+        resp = get_req.get_response(self.app)
+        self.assertEqual('', resp.body)
+        self.assertEqual(EMPTY_ETAG, resp.headers['Etag'])
+
+    def test_PUT_with_other_footers(self):
+        # verify handling of another middleware's footer callback
+        cont_key = fetch_crypto_keys()['container']
+        body_key = os.urandom(32)
+        object_key = fetch_crypto_keys()['object']
+        plaintext = 'FAKE APP'
+        plaintext_etag = md5hex(plaintext)
+        ciphertext = encrypt(plaintext, body_key, FAKE_IV)
+        ciphertext_etag = md5hex(ciphertext)
+        other_footers = {
+            'Etag': plaintext_etag,
+            'X-Object-Sysmeta-Other': 'other sysmeta',
+            'X-Object-Sysmeta-Container-Update-Override-Size':
+                'other override',
+            'X-Object-Sysmeta-Container-Update-Override-Etag':
+                'final etag'}
+
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys,
+               'swift.callback.update_footers':
+                   lambda footers: footers.update(other_footers)}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(plaintext)),
+                'Etag': 'correct etag is in footers'}
+        req = Request.blank(
+            '/v1/a/c/o', environ=env, body=plaintext, headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated, {})
+
+        with mock.patch(
+            'swift.common.middleware.crypto.crypto_utils.'
+            'Crypto.create_random_key',
+                lambda *args: body_key):
+            resp = req.get_response(self.encrypter)
+
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual(plaintext_etag, resp.headers['Etag'])
+
+        # verify metadata items
+        self.assertEqual(1, len(self.app.calls), self.app.calls)
+        self.assertEqual('PUT', self.app.calls[0][0])
+        req_hdrs = self.app.headers[0]
+
+        # verify that other middleware's footers made it to app, including any
+        # container update overrides but nothing Etag-related
+        other_footers.pop('Etag')
+        other_footers.pop('X-Object-Sysmeta-Container-Update-Override-Etag')
+        for k, v in other_footers.items():
+            self.assertEqual(v, req_hdrs[k])
+
+        # verify encryption footers are ok
+        encrypted_etag, _junk, etag_meta = \
+            req_hdrs['X-Object-Sysmeta-Crypto-Etag'].partition('; swift_meta=')
+        self.assertTrue(etag_meta)
+        actual_meta = json.loads(urllib.unquote_plus(etag_meta))
+        self.assertEqual(Crypto().cipher, actual_meta['cipher'])
+
+        self.assertEqual(ciphertext_etag, req_hdrs['Etag'])
+        actual = base64.b64decode(encrypted_etag)
+        etag_iv = base64.b64decode(actual_meta['iv'])
+        self.assertEqual(encrypt(plaintext_etag, object_key, etag_iv), actual)
+
+        # verify encrypted etag for container update
+        self.assertIn(
+            'X-Object-Sysmeta-Container-Update-Override-Etag', req_hdrs)
+        parts = req_hdrs[
+            'X-Object-Sysmeta-Container-Update-Override-Etag'].rsplit(';', 1)
+        self.assertEqual(2, len(parts))
+
+        # extract crypto_meta from end of etag for container update
+        param = parts[1].strip()
+        crypto_meta_tag = 'swift_meta='
+        self.assertTrue(param.startswith(crypto_meta_tag), param)
+        actual_meta = json.loads(
+            urllib.unquote_plus(param[len(crypto_meta_tag):]))
+        self.assertEqual(Crypto().cipher, actual_meta['cipher'])
+
+        cont_key = fetch_crypto_keys()['container']
+        cont_etag_iv = base64.b64decode(actual_meta['iv'])
+        self.assertEqual(FAKE_IV, cont_etag_iv)
+        self.assertEqual(encrypt('final etag', cont_key, cont_etag_iv),
+                         base64.b64decode(parts[0]))
+
+        # verify body crypto meta
+        actual = req_hdrs['X-Object-Sysmeta-Crypto-Body-Meta']
+        actual = json.loads(urllib.unquote_plus(actual))
+        self.assertEqual(Crypto().cipher, actual['cipher'])
+        self.assertEqual(FAKE_IV, base64.b64decode(actual['iv']))
+
+        # verify wrapped body key
+        expected_wrapped_key = encrypt(body_key, object_key, FAKE_IV)
+        self.assertEqual(expected_wrapped_key,
+                         base64.b64decode(actual['body_key']['key']))
+        self.assertEqual(FAKE_IV,
+                         base64.b64decode(actual['body_key']['iv']))
+        self.assertEqual(fetch_crypto_keys()['id'], actual['key_id'])
+
+    def test_PUT_with_etag_override_in_headers(self):
+        # verify handling of another middleware's
+        # container-update-override-etag in headers
+        plaintext = 'FAKE APP'
+        plaintext_etag = md5hex(plaintext)
+
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(plaintext)),
+                'Etag': plaintext_etag,
+                'X-Object-Sysmeta-Container-Update-Override-Etag':
+                    'final etag'}
+        req = Request.blank(
+            '/v1/a/c/o', environ=env, body=plaintext, headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated, {})
+        resp = req.get_response(self.encrypter)
+
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual(plaintext_etag, resp.headers['Etag'])
+
+        # verify metadata items
+        self.assertEqual(1, len(self.app.calls), self.app.calls)
+        self.assertEqual(('PUT', '/v1/a/c/o'), self.app.calls[0])
+        req_hdrs = self.app.headers[0]
+
+        # verify encrypted etag for container update
+        self.assertIn(
+            'X-Object-Sysmeta-Container-Update-Override-Etag', req_hdrs)
+        parts = req_hdrs[
+            'X-Object-Sysmeta-Container-Update-Override-Etag'].rsplit(';', 1)
+        self.assertEqual(2, len(parts))
+        cont_key = fetch_crypto_keys()['container']
+
+        # extract crypto_meta from end of etag for container update
+        param = parts[1].strip()
+        crypto_meta_tag = 'swift_meta='
+        self.assertTrue(param.startswith(crypto_meta_tag), param)
+        actual_meta = json.loads(
+            urllib.unquote_plus(param[len(crypto_meta_tag):]))
+        self.assertEqual(Crypto().cipher, actual_meta['cipher'])
+        self.assertEqual(fetch_crypto_keys()['id'], actual_meta['key_id'])
+
+        cont_etag_iv = base64.b64decode(actual_meta['iv'])
+        self.assertEqual(FAKE_IV, cont_etag_iv)
+        self.assertEqual(encrypt('final etag', cont_key, cont_etag_iv),
+                         base64.b64decode(parts[0]))
+
+    def test_PUT_with_bad_etag_in_other_footers(self):
+        # verify that etag supplied in footers from other middleware overrides
+        # header etag when validating inbound plaintext etags
+        plaintext = 'FAKE APP'
+        plaintext_etag = md5hex(plaintext)
+        other_footers = {
+            'Etag': 'bad etag',
+            'X-Object-Sysmeta-Other': 'other sysmeta',
+            'X-Object-Sysmeta-Container-Update-Override-Etag':
+                'other override'}
+
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys,
+               'swift.callback.update_footers':
+                   lambda footers: footers.update(other_footers)}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(plaintext)),
+                'Etag': plaintext_etag}
+        req = Request.blank(
+            '/v1/a/c/o', environ=env, body=plaintext, headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated, {})
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('422 Unprocessable Entity', resp.status)
+        self.assertNotIn('Etag', resp.headers)
+
+    def test_PUT_with_bad_etag_in_headers_and_other_footers(self):
+        # verify that etag supplied in headers from other middleware is used if
+        # none is supplied in footers when validating inbound plaintext etags
+        plaintext = 'FAKE APP'
+        other_footers = {
+            'X-Object-Sysmeta-Other': 'other sysmeta',
+            'X-Object-Sysmeta-Container-Update-Override-Etag':
+                'other override'}
+
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys,
+               'swift.callback.update_footers':
+                   lambda footers: footers.update(other_footers)}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(plaintext)),
+                'Etag': 'bad etag'}
+        req = Request.blank(
+            '/v1/a/c/o', environ=env, body=plaintext, headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated, {})
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('422 Unprocessable Entity', resp.status)
+        self.assertNotIn('Etag', resp.headers)
+
+    def test_PUT_nothing_read(self):
+        # simulate an artificial scenario of a downstream filter/app not
+        # actually reading the input stream from encrypter.
+        class NonReadingApp(object):
+            def __call__(self, env, start_response):
+                # note: no read from wsgi.input
+                req = Request(env)
+                env['swift.callback.update_footers'](req.headers)
+                call_headers.append(req.headers)
+                resp = HTTPCreated(req=req, headers={'Etag': 'response etag'})
+                return resp(env, start_response)
+
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': 0,
+                'etag': 'etag from client'}
+        req = Request.blank('/v1/a/c/o', environ=env, body='', headers=hdrs)
+
+        call_headers = []
+        resp = req.get_response(encrypter.Encrypter(NonReadingApp(), {}))
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual('response etag', resp.headers['Etag'])
+        self.assertEqual(1, len(call_headers))
+        self.assertEqual('etag from client', call_headers[0]['etag'])
+        # verify no encryption footers
+        for k in call_headers[0]:
+            self.assertFalse(k.lower().startswith('x-object-sysmeta-crypto-'))
+
+        # check that an upstream footer callback gets called
+        other_footers = {
+            'Etag': 'other etag',
+            'X-Object-Sysmeta-Other': 'other sysmeta',
+            'X-Backend-Container-Update-Override-Etag': 'other override'}
+        env.update({'swift.callback.update_footers':
+                    lambda footers: footers.update(other_footers)})
+        req = Request.blank('/v1/a/c/o', environ=env, body='', headers=hdrs)
+
+        call_headers = []
+        resp = req.get_response(encrypter.Encrypter(NonReadingApp(), {}))
+
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual('response etag', resp.headers['Etag'])
+        self.assertEqual(1, len(call_headers))
+        # verify that other middleware's footers made it to app
+        for k, v in other_footers.items():
+            self.assertEqual(v, call_headers[0][k])
+        # verify no encryption footers
+        for k in call_headers[0]:
+            self.assertFalse(k.lower().startswith('x-object-sysmeta-crypto-'))
+
+    def test_POST_req(self):
+        body = 'FAKE APP'
+        env = {'REQUEST_METHOD': 'POST',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        hdrs = {'x-object-meta-test': 'encrypt me',
+                'x-object-sysmeta-test': 'do not encrypt me'}
+        req = Request.blank('/v1/a/c/o', environ=env, body=body, headers=hdrs)
+        key = fetch_crypto_keys()['object']
+        self.app.register('POST', '/v1/a/c/o', HTTPAccepted, {})
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('202 Accepted', resp.status)
+        self.assertNotIn('Etag', resp.headers)
+
+        # verify metadata items
+        self.assertEqual(1, len(self.app.calls), self.app.calls)
+        self.assertEqual('POST', self.app.calls[0][0])
+        req_hdrs = self.app.headers[0]
+
+        # user meta is encrypted
+        self._verify_user_metadata(req_hdrs, 'Test', 'encrypt me', key)
+
+        # sysmeta is not encrypted
+        self.assertEqual('do not encrypt me',
+                         req_hdrs['X-Object-Sysmeta-Test'])
+
+    def _test_no_user_metadata(self, method):
+        # verify that x-object-transient-sysmeta-crypto-meta is not set when
+        # there is no user metadata
+        env = {'REQUEST_METHOD': method,
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        req = Request.blank('/v1/a/c/o', environ=env, body='body')
+        self.app.register(method, '/v1/a/c/o', HTTPAccepted, {})
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('202 Accepted', resp.status)
+        self.assertEqual(1, len(self.app.calls), self.app.calls)
+        self.assertEqual(method, self.app.calls[0][0])
+        self.assertNotIn('x-object-transient-sysmeta-crypto-meta',
+                         self.app.headers[0])
+
+    def test_PUT_no_user_metadata(self):
+        self._test_no_user_metadata('PUT')
+
+    def test_POST_no_user_metadata(self):
+        self._test_no_user_metadata('POST')
+
+    def _test_if_match(self, method, match_header_name):
+        def do_test(method, plain_etags, expected_plain_etags=None):
+            env = {CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+            match_header_value = ', '.join(plain_etags)
+            req = Request.blank(
+                '/v1/a/c/o', environ=env, method=method,
+                headers={match_header_name: match_header_value})
+            app = FakeSwift()
+            app.register(method, '/v1/a/c/o', HTTPOk, {})
+            resp = req.get_response(encrypter.Encrypter(app, {}))
+            self.assertEqual('200 OK', resp.status)
+
+            self.assertEqual(1, len(app.calls), app.calls)
+            self.assertEqual(method, app.calls[0][0])
+            actual_headers = app.headers[0]
+
+            # verify the alternate etag location has been specified
+            if match_header_value and match_header_value != '*':
+                self.assertIn('X-Backend-Etag-Is-At', actual_headers)
+                self.assertEqual('X-Object-Sysmeta-Crypto-Etag-Mac',
+                                 actual_headers['X-Backend-Etag-Is-At'])
+
+            # verify etags have been supplemented with masked values
+            self.assertIn(match_header_name, actual_headers)
+            actual_etags = set(actual_headers[match_header_name].split(', '))
+            key = fetch_crypto_keys()['object']
+            masked_etags = [
+                '"%s"' % base64.b64encode(hmac.new(
+                    key, etag.strip('"'), hashlib.sha256).digest())
+                for etag in plain_etags if etag not in ('*', '')]
+            expected_etags = set((expected_plain_etags or plain_etags) +
+                                 masked_etags)
+            self.assertEqual(expected_etags, actual_etags)
+            # check that the request environ was returned to original state
+            self.assertEqual(set(plain_etags),
+                             set(req.headers[match_header_name].split(', ')))
+
+        do_test(method, [''])
+        do_test(method, ['"an etag"'])
+        do_test(method, ['"an etag"', '"another_etag"'])
+        do_test(method, ['*'])
+        # rfc2616 does not allow wildcard *and* etag but test it anyway
+        do_test(method, ['*', '"an etag"'])
+        # etags should be quoted but check we can cope if they are not
+        do_test(
+            method, ['*', 'an etag', 'another_etag'],
+            expected_plain_etags=['*', '"an etag"', '"another_etag"'])
+
+    def test_GET_if_match(self):
+        self._test_if_match('GET', 'If-Match')
+
+    def test_HEAD_if_match(self):
+        self._test_if_match('HEAD', 'If-Match')
+
+    def test_GET_if_none_match(self):
+        self._test_if_match('GET', 'If-None-Match')
+
+    def test_HEAD_if_none_match(self):
+        self._test_if_match('HEAD', 'If-None-Match')
+
+    def _test_existing_etag_is_at_header(self, method, match_header_name):
+        # if another middleware has already set X-Backend-Etag-Is-At then
+        # encrypter should not override that value
+        env = {CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        req = Request.blank(
+            '/v1/a/c/o', environ=env, method=method,
+            headers={match_header_name: "an etag",
+                     'X-Backend-Etag-Is-At': 'X-Object-Sysmeta-Other-Etag'})
+        self.app.register(method, '/v1/a/c/o', HTTPOk, {})
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('200 OK', resp.status)
+
+        self.assertEqual(1, len(self.app.calls), self.app.calls)
+        self.assertEqual(method, self.app.calls[0][0])
+        actual_headers = self.app.headers[0]
+        self.assertIn('X-Backend-Etag-Is-At', actual_headers)
+        self.assertEqual(
+            'X-Object-Sysmeta-Other-Etag,X-Object-Sysmeta-Crypto-Etag-Mac',
+            actual_headers['X-Backend-Etag-Is-At'])
+        actual_etags = set(actual_headers[match_header_name].split(', '))
+        self.assertIn('"an etag"', actual_etags)
+
+    def test_GET_if_match_with_existing_etag_is_at_header(self):
+        self._test_existing_etag_is_at_header('GET', 'If-Match')
+
+    def test_HEAD_if_match_with_existing_etag_is_at_header(self):
+        self._test_existing_etag_is_at_header('HEAD', 'If-Match')
+
+    def test_GET_if_none_match_with_existing_etag_is_at_header(self):
+        self._test_existing_etag_is_at_header('GET', 'If-None-Match')
+
+    def test_HEAD_if_none_match_with_existing_etag_is_at_header(self):
+        self._test_existing_etag_is_at_header('HEAD', 'If-None-Match')
+
+    def _test_etag_is_at_not_duplicated(self, method):
+        # verify only one occurrence of X-Object-Sysmeta-Crypto-Etag-Mac in
+        # X-Backend-Etag-Is-At
+        key = fetch_crypto_keys()['object']
+        env = {CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        req = Request.blank(
+            '/v1/a/c/o', environ=env, method=method,
+            headers={'If-Match': '"an etag"',
+                     'If-None-Match': '"another etag"'})
+        self.app.register(method, '/v1/a/c/o', HTTPOk, {})
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('200 OK', resp.status)
+
+        self.assertEqual(1, len(self.app.calls), self.app.calls)
+        self.assertEqual(method, self.app.calls[0][0])
+        actual_headers = self.app.headers[0]
+        self.assertIn('X-Backend-Etag-Is-At', actual_headers)
+        self.assertEqual('X-Object-Sysmeta-Crypto-Etag-Mac',
+                         actual_headers['X-Backend-Etag-Is-At'])
+
+        self.assertIn('"%s"' % base64.b64encode(
+            hmac.new(key, 'an etag', hashlib.sha256).digest()),
+            actual_headers['If-Match'])
+        self.assertIn('"another etag"', actual_headers['If-None-Match'])
+        self.assertIn('"%s"' % base64.b64encode(
+            hmac.new(key, 'another etag', hashlib.sha256).digest()),
+            actual_headers['If-None-Match'])
+
+    def test_GET_etag_is_at_not_duplicated(self):
+        self._test_etag_is_at_not_duplicated('GET')
+
+    def test_HEAD_etag_is_at_not_duplicated(self):
+        self._test_etag_is_at_not_duplicated('HEAD')
+
+    def test_PUT_response_inconsistent_etag_is_not_replaced(self):
+        # if response is success but etag does not match the ciphertext md5
+        # then verify that we do *not* replace it with the plaintext etag
+        body = 'FAKE APP'
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(body))}
+        req = Request.blank('/v1/a/c/o', environ=env, body=body, headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated,
+                          {'Etag': 'not the ciphertext etag'})
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual('not the ciphertext etag', resp.headers['Etag'])
+
+    def test_PUT_multiseg_no_client_etag(self):
+        body_key = os.urandom(32)
+        chunks = ['some', 'chunks', 'of data']
+        body = ''.join(chunks)
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys,
+               'wsgi.input': FileLikeIter(chunks)}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(body))}
+        req = Request.blank('/v1/a/c/o', environ=env, headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated, {})
+
+        with mock.patch(
+            'swift.common.middleware.crypto.crypto_utils.'
+            'Crypto.create_random_key',
+                lambda *args: body_key):
+            resp = req.get_response(self.encrypter)
+
+        self.assertEqual('201 Created', resp.status)
+        # verify object is encrypted by getting direct from the app
+        get_req = Request.blank('/v1/a/c/o', environ={'REQUEST_METHOD': 'GET'})
+        self.assertEqual(encrypt(body, body_key, FAKE_IV),
+                         get_req.get_response(self.app).body)
+
+    def test_PUT_multiseg_good_client_etag(self):
+        body_key = os.urandom(32)
+        chunks = ['some', 'chunks', 'of data']
+        body = ''.join(chunks)
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys,
+               'wsgi.input': FileLikeIter(chunks)}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(body)),
+                'Etag': md5hex(body)}
+        req = Request.blank('/v1/a/c/o', environ=env, headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated, {})
+
+        with mock.patch(
+            'swift.common.middleware.crypto.crypto_utils.'
+            'Crypto.create_random_key',
+                lambda *args: body_key):
+            resp = req.get_response(self.encrypter)
+
+        self.assertEqual('201 Created', resp.status)
+        # verify object is encrypted by getting direct from the app
+        get_req = Request.blank('/v1/a/c/o', environ={'REQUEST_METHOD': 'GET'})
+        self.assertEqual(encrypt(body, body_key, FAKE_IV),
+                         get_req.get_response(self.app).body)
+
+    def test_PUT_multiseg_bad_client_etag(self):
+        chunks = ['some', 'chunks', 'of data']
+        body = ''.join(chunks)
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys,
+               'wsgi.input': FileLikeIter(chunks)}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(body)),
+                'Etag': 'badclientetag'}
+        req = Request.blank('/v1/a/c/o', environ=env, headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated, {})
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('422 Unprocessable Entity', resp.status)
+
+    def test_PUT_missing_key_callback(self):
+        body = 'FAKE APP'
+        env = {'REQUEST_METHOD': 'PUT'}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(body))}
+        req = Request.blank('/v1/a/c/o', environ=env, body=body, headers=hdrs)
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('500 Internal Error', resp.status)
+        self.assertIn('missing callback',
+                      self.encrypter.logger.get_lines_for_level('error')[0])
+        self.assertEqual('Unable to retrieve encryption keys.', resp.body)
+
+    def test_PUT_error_in_key_callback(self):
+        def raise_exc():
+            raise Exception('Testing')
+
+        body = 'FAKE APP'
+        env = {'REQUEST_METHOD': 'PUT',
+               CRYPTO_KEY_CALLBACK: raise_exc}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(body))}
+        req = Request.blank('/v1/a/c/o', environ=env, body=body, headers=hdrs)
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('500 Internal Error', resp.status)
+        self.assertIn('from callback: Testing',
+                      self.encrypter.logger.get_lines_for_level('error')[0])
+        self.assertEqual('Unable to retrieve encryption keys.', resp.body)
+
+    def test_PUT_encryption_override(self):
+        # set crypto override to disable encryption.
+        # simulate another middleware wanting to set footers
+        other_footers = {
+            'Etag': 'other etag',
+            'X-Object-Sysmeta-Other': 'other sysmeta',
+            'X-Object-Sysmeta-Container-Update-Override-Etag':
+                'other override'}
+        body = 'FAKE APP'
+        env = {'REQUEST_METHOD': 'PUT',
+               'swift.crypto.override': True,
+               'swift.callback.update_footers':
+                   lambda footers: footers.update(other_footers)}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(body))}
+        req = Request.blank('/v1/a/c/o', environ=env, body=body, headers=hdrs)
+        self.app.register('PUT', '/v1/a/c/o', HTTPCreated, {})
+        resp = req.get_response(self.encrypter)
+        self.assertEqual('201 Created', resp.status)
+
+        # verify that other middleware's footers made it to app
+        req_hdrs = self.app.headers[0]
+        for k, v in other_footers.items():
+            self.assertEqual(v, req_hdrs[k])
+
+        # verify object is NOT encrypted by getting direct from the app
+        get_req = Request.blank('/v1/a/c/o', environ={'REQUEST_METHOD': 'GET'})
+        self.assertEqual(body, get_req.get_response(self.app).body)
+
+    def _test_constraints_checking(self, method):
+        # verify that the check_metadata function is called on PUT and POST
+        body = 'FAKE APP'
+        env = {'REQUEST_METHOD': method,
+               CRYPTO_KEY_CALLBACK: fetch_crypto_keys}
+        hdrs = {'content-type': 'text/plain',
+                'content-length': str(len(body))}
+        req = Request.blank('/v1/a/c/o', environ=env, body=body, headers=hdrs)
+        mocked_func = 'swift.common.middleware.crypto.encrypter.check_metadata'
+        with mock.patch(mocked_func) as mocked:
+            mocked.side_effect = [HTTPBadRequest('testing')]
+            resp = req.get_response(self.encrypter)
+        self.assertEqual('400 Bad Request', resp.status)
+        self.assertEqual(1, mocked.call_count)
+        mocked.assert_called_once_with(mock.ANY, 'object')
+        self.assertEqual(req.headers,
+                         mocked.call_args_list[0][0][0].headers)
+
+    def test_PUT_constraints_checking(self):
+        self._test_constraints_checking('PUT')
+
+    def test_POST_constraints_checking(self):
+        self._test_constraints_checking('POST')
+
+    def test_config_true_value_on_disable_encryption(self):
+        app = FakeSwift()
+        self.assertFalse(encrypter.Encrypter(app, {}).disable_encryption)
+        for val in ('true', '1', 'yes', 'on', 't', 'y'):
+            app = encrypter.Encrypter(app,
+                                      {'disable_encryption': val})
+            self.assertTrue(app.disable_encryption)
+
+    def test_PUT_app_exception(self):
+        app = encrypter.Encrypter(FakeAppThatExcepts(HTTPException), {})
+        req = Request.blank('/', environ={'REQUEST_METHOD': 'PUT'})
+        with self.assertRaises(HTTPException) as catcher:
+            req.get_response(app)
+        self.assertEqual(FakeAppThatExcepts.MESSAGE, catcher.exception.body)
+
+
+if __name__ == '__main__':
+    unittest.main()

test/unit/common/middleware/crypto/test_encryption.py

@@ -0,0 +1,631 @@
+# Copyright (c) 2015-2016 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import base64
+import hashlib
+import hmac
+import json
+import unittest
+import uuid
+
+from swift.common import storage_policy, constraints
+from swift.common.middleware import copy
+from swift.common.middleware import crypto
+from swift.common.middleware.crypto import keymaster
+from swift.common.middleware.crypto.crypto_utils import (
+    load_crypto_meta, Crypto)
+from swift.common.ring import Ring
+from swift.common.swob import Request
+from swift.obj import diskfile
+
+from test.unit import FakeLogger
+from test.unit.common.middleware.crypto.crypto_helpers import (
+    md5hex, encrypt, TEST_KEYMASTER_CONF)
+from test.unit.helpers import setup_servers, teardown_servers
+
+
+class TestCryptoPipelineChanges(unittest.TestCase):
+    # Tests the consequences of crypto middleware being in/out of the pipeline
+    # or having encryption disabled for PUT/GET requests on same object. Uses
+    # real backend servers so that the handling of headers and sysmeta is
+    # verified to diskfile and back.
+    _test_context = None
+
+    @classmethod
+    def setUpClass(cls):
+        cls._test_context = setup_servers()
+        cls.proxy_app = cls._test_context["test_servers"][0]
+
+    @classmethod
+    def tearDownClass(cls):
+        if cls._test_context is not None:
+            teardown_servers(cls._test_context)
+            cls._test_context = None
+
+    def setUp(self):
+        self.plaintext = 'unencrypted body content'
+        self.plaintext_etag = md5hex(self.plaintext)
+        self._setup_crypto_app()
+
+    def _setup_crypto_app(self, disable_encryption=False):
+        # Set up a pipeline of crypto middleware ending in the proxy app so
+        # that tests can make requests to either the proxy server directly or
+        # via the crypto middleware. Make a fresh instance for each test to
+        # avoid any state coupling.
+        conf = {'disable_encryption': disable_encryption}
+        self.encryption = crypto.filter_factory(conf)(self.proxy_app)
+        self.km = keymaster.KeyMaster(self.encryption, TEST_KEYMASTER_CONF)
+        self.crypto_app = self.km  # for clarity
+
+    def _create_container(self, app, policy_name='one', container_path=None):
+        if not container_path:
+            # choose new container name so that the policy can be specified
+            self.container_name = uuid.uuid4().hex
+            self.container_path = 'http://foo:8080/v1/a/' + self.container_name
+            self.object_name = 'o'
+            self.object_path = self.container_path + '/' + self.object_name
+            container_path = self.container_path
+        req = Request.blank(
+            container_path, method='PUT',
+            headers={'X-Storage-Policy': policy_name})
+        resp = req.get_response(app)
+        self.assertEqual('201 Created', resp.status)
+        # sanity check
+        req = Request.blank(
+            container_path, method='HEAD',
+            headers={'X-Storage-Policy': policy_name})
+        resp = req.get_response(app)
+        self.assertEqual(policy_name, resp.headers['X-Storage-Policy'])
+
+    def _put_object(self, app, body):
+        req = Request.blank(self.object_path, method='PUT', body=body,
+                            headers={'Content-Type': 'application/test'})
+        resp = req.get_response(app)
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual(self.plaintext_etag, resp.headers['Etag'])
+        return resp
+
+    def _post_object(self, app):
+        req = Request.blank(self.object_path, method='POST',
+                            headers={'Content-Type': 'application/test',
+                                     'X-Object-Meta-Fruit': 'Kiwi'})
+        resp = req.get_response(app)
+        self.assertEqual('202 Accepted', resp.status)
+        return resp
+
+    def _copy_object(self, app, destination):
+        req = Request.blank(self.object_path, method='COPY',
+                            headers={'Destination': destination})
+        resp = req.get_response(app)
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual(self.plaintext_etag, resp.headers['Etag'])
+        return resp
+
+    def _check_GET_and_HEAD(self, app, object_path=None):
+        object_path = object_path or self.object_path
+        req = Request.blank(object_path, method='GET')
+        resp = req.get_response(app)
+        self.assertEqual('200 OK', resp.status)
+        self.assertEqual(self.plaintext, resp.body)
+        self.assertEqual('Kiwi', resp.headers['X-Object-Meta-Fruit'])
+
+        req = Request.blank(object_path, method='HEAD')
+        resp = req.get_response(app)
+        self.assertEqual('200 OK', resp.status)
+        self.assertEqual('', resp.body)
+        self.assertEqual('Kiwi', resp.headers['X-Object-Meta-Fruit'])
+
+    def _check_match_requests(self, method, app, object_path=None):
+        object_path = object_path or self.object_path
+        # verify conditional match requests
+        expected_body = self.plaintext if method == 'GET' else ''
+
+        # If-Match matches
+        req = Request.blank(object_path, method=method,
+                            headers={'If-Match': '"%s"' % self.plaintext_etag})
+        resp = req.get_response(app)
+        self.assertEqual('200 OK', resp.status)
+        self.assertEqual(expected_body, resp.body)
+        self.assertEqual(self.plaintext_etag, resp.headers['Etag'])
+        self.assertEqual('Kiwi', resp.headers['X-Object-Meta-Fruit'])
+
+        # If-Match wildcard
+        req = Request.blank(object_path, method=method,
+                            headers={'If-Match': '*'})
+        resp = req.get_response(app)
+        self.assertEqual('200 OK', resp.status)
+        self.assertEqual(expected_body, resp.body)
+        self.assertEqual(self.plaintext_etag, resp.headers['Etag'])
+        self.assertEqual('Kiwi', resp.headers['X-Object-Meta-Fruit'])
+
+        # If-Match does not match
+        req = Request.blank(object_path, method=method,
+                            headers={'If-Match': '"not the etag"'})
+        resp = req.get_response(app)
+        self.assertEqual('412 Precondition Failed', resp.status)
+        self.assertEqual('', resp.body)
+        self.assertEqual(self.plaintext_etag, resp.headers['Etag'])
+
+        # If-None-Match matches
+        req = Request.blank(
+            object_path, method=method,
+            headers={'If-None-Match': '"%s"' % self.plaintext_etag})
+        resp = req.get_response(app)
+        self.assertEqual('304 Not Modified', resp.status)
+        self.assertEqual('', resp.body)
+        self.assertEqual(self.plaintext_etag, resp.headers['Etag'])
+
+        # If-None-Match wildcard
+        req = Request.blank(object_path, method=method,
+                            headers={'If-None-Match': '*'})
+        resp = req.get_response(app)
+        self.assertEqual('304 Not Modified', resp.status)
+        self.assertEqual('', resp.body)
+        self.assertEqual(self.plaintext_etag, resp.headers['Etag'])
+
+        # If-None-Match does not match
+        req = Request.blank(object_path, method=method,
+                            headers={'If-None-Match': '"not the etag"'})
+        resp = req.get_response(app)
+        self.assertEqual('200 OK', resp.status)
+        self.assertEqual(expected_body, resp.body)
+        self.assertEqual(self.plaintext_etag, resp.headers['Etag'])
+        self.assertEqual('Kiwi', resp.headers['X-Object-Meta-Fruit'])
+
+    def _check_listing(self, app, expect_mismatch=False, container_path=None):
+        container_path = container_path or self.container_path
+        req = Request.blank(
+            container_path, method='GET', query_string='format=json')
+        resp = req.get_response(app)
+        self.assertEqual('200 OK', resp.status)
+        listing = json.loads(resp.body)
+        self.assertEqual(1, len(listing))
+        self.assertEqual(self.object_name, listing[0]['name'])
+        self.assertEqual(len(self.plaintext), listing[0]['bytes'])
+        if expect_mismatch:
+            self.assertNotEqual(self.plaintext_etag, listing[0]['hash'])
+        else:
+            self.assertEqual(self.plaintext_etag, listing[0]['hash'])
+
+    def test_write_with_crypto_and_override_headers(self):
+        self._create_container(self.proxy_app, policy_name='one')
+
+        def verify_overrides():
+            # verify object sysmeta
+            req = Request.blank(
+                self.object_path, method='GET')
+            resp = req.get_response(self.crypto_app)
+            for k, v in overrides.items():
+                self.assertIn(k, resp.headers)
+                self.assertEqual(overrides[k], resp.headers[k])
+
+            # check container listing
+            req = Request.blank(
+                self.container_path, method='GET', query_string='format=json')
+            resp = req.get_response(self.crypto_app)
+            self.assertEqual('200 OK', resp.status)
+            listing = json.loads(resp.body)
+            self.assertEqual(1, len(listing))
+            self.assertEqual('o', listing[0]['name'])
+            self.assertEqual(
+                overrides['x-object-sysmeta-container-update-override-size'],
+                str(listing[0]['bytes']))
+            self.assertEqual(
+                overrides['x-object-sysmeta-container-update-override-etag'],
+                listing[0]['hash'])
+
+        # include overrides in headers
+        overrides = {'x-object-sysmeta-container-update-override-etag': 'foo',
+                     'x-object-sysmeta-container-update-override-size':
+                         str(len(self.plaintext) + 1)}
+        req = Request.blank(self.object_path, method='PUT',
+                            body=self.plaintext, headers=overrides.copy())
+        resp = req.get_response(self.crypto_app)
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual(self.plaintext_etag, resp.headers['Etag'])
+        verify_overrides()
+
+        # include overrides in footers
+        overrides = {'x-object-sysmeta-container-update-override-etag': 'bar',
+                     'x-object-sysmeta-container-update-override-size':
+                         str(len(self.plaintext) + 2)}
+
+        def callback(footers):
+            footers.update(overrides)
+
+        req = Request.blank(
+            self.object_path, method='PUT', body=self.plaintext)
+        req.environ['swift.callback.update_footers'] = callback
+        resp = req.get_response(self.crypto_app)
+        self.assertEqual('201 Created', resp.status)
+        self.assertEqual(self.plaintext_etag, resp.headers['Etag'])
+        verify_overrides()
+
+    def test_write_with_crypto_read_with_crypto(self):
+        self._create_container(self.proxy_app, policy_name='one')
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+        self._check_GET_and_HEAD(self.crypto_app)
+        self._check_match_requests('GET', self.crypto_app)
+        self._check_match_requests('HEAD', self.crypto_app)
+        self._check_listing(self.crypto_app)
+
+    def test_write_with_crypto_read_with_crypto_ec(self):
+        self._create_container(self.proxy_app, policy_name='ec')
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+        self._check_GET_and_HEAD(self.crypto_app)
+        self._check_match_requests('GET', self.crypto_app)
+        self._check_match_requests('HEAD', self.crypto_app)
+        self._check_listing(self.crypto_app)
+
+    def test_put_without_crypto_post_with_crypto_read_with_crypto(self):
+        self._create_container(self.proxy_app, policy_name='one')
+        self._put_object(self.proxy_app, self.plaintext)
+        self._post_object(self.crypto_app)
+        self._check_GET_and_HEAD(self.crypto_app)
+        self._check_match_requests('GET', self.crypto_app)
+        self._check_match_requests('HEAD', self.crypto_app)
+        self._check_listing(self.crypto_app)
+
+    def test_write_without_crypto_read_with_crypto(self):
+        self._create_container(self.proxy_app, policy_name='one')
+        self._put_object(self.proxy_app, self.plaintext)
+        self._post_object(self.proxy_app)
+        self._check_GET_and_HEAD(self.proxy_app)  # sanity check
+        self._check_GET_and_HEAD(self.crypto_app)
+        self._check_match_requests('GET', self.proxy_app)  # sanity check
+        self._check_match_requests('GET', self.crypto_app)
+        self._check_match_requests('HEAD', self.proxy_app)  # sanity check
+        self._check_match_requests('HEAD', self.crypto_app)
+        self._check_listing(self.crypto_app)
+
+    def test_write_without_crypto_read_with_crypto_ec(self):
+        self._create_container(self.proxy_app, policy_name='ec')
+        self._put_object(self.proxy_app, self.plaintext)
+        self._post_object(self.proxy_app)
+        self._check_GET_and_HEAD(self.proxy_app)  # sanity check
+        self._check_GET_and_HEAD(self.crypto_app)
+        self._check_match_requests('GET', self.proxy_app)  # sanity check
+        self._check_match_requests('GET', self.crypto_app)
+        self._check_match_requests('HEAD', self.proxy_app)  # sanity check
+        self._check_match_requests('HEAD', self.crypto_app)
+        self._check_listing(self.crypto_app)
+
+    def _check_GET_and_HEAD_not_decrypted(self, app):
+        req = Request.blank(self.object_path, method='GET')
+        resp = req.get_response(app)
+        self.assertEqual('200 OK', resp.status)
+        self.assertNotEqual(self.plaintext, resp.body)
+        self.assertEqual('%s' % len(self.plaintext),
+                         resp.headers['Content-Length'])
+        self.assertNotEqual('Kiwi', resp.headers['X-Object-Meta-Fruit'])
+
+        req = Request.blank(self.object_path, method='HEAD')
+        resp = req.get_response(app)
+        self.assertEqual('200 OK', resp.status)
+        self.assertEqual('', resp.body)
+        self.assertNotEqual('Kiwi', resp.headers['X-Object-Meta-Fruit'])
+
+    def test_write_with_crypto_read_without_crypto(self):
+        self._create_container(self.proxy_app, policy_name='one')
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+        self._check_GET_and_HEAD(self.crypto_app)  # sanity check
+        # without crypto middleware, GET and HEAD returns ciphertext
+        self._check_GET_and_HEAD_not_decrypted(self.proxy_app)
+        self._check_listing(self.proxy_app, expect_mismatch=True)
+
+    def test_write_with_crypto_read_without_crypto_ec(self):
+        self._create_container(self.proxy_app, policy_name='ec')
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+        self._check_GET_and_HEAD(self.crypto_app)  # sanity check
+        # without crypto middleware, GET and HEAD returns ciphertext
+        self._check_GET_and_HEAD_not_decrypted(self.proxy_app)
+        self._check_listing(self.proxy_app, expect_mismatch=True)
+
+    def test_disable_encryption_config_option(self):
+        # check that on disable_encryption = true, object is not encrypted
+        self._setup_crypto_app(disable_encryption=True)
+        self._create_container(self.proxy_app, policy_name='one')
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+        self._check_GET_and_HEAD(self.crypto_app)
+        # check as if no crypto middleware exists
+        self._check_GET_and_HEAD(self.proxy_app)
+        self._check_match_requests('GET', self.crypto_app)
+        self._check_match_requests('HEAD', self.crypto_app)
+        self._check_match_requests('GET', self.proxy_app)
+        self._check_match_requests('HEAD', self.proxy_app)
+
+    def test_write_with_crypto_read_with_disable_encryption_conf(self):
+        self._create_container(self.proxy_app, policy_name='one')
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+        self._check_GET_and_HEAD(self.crypto_app)  # sanity check
+        # turn on disable_encryption config option
+        self._setup_crypto_app(disable_encryption=True)
+        # GET and HEAD of encrypted objects should still work
+        self._check_GET_and_HEAD(self.crypto_app)
+        self._check_listing(self.crypto_app, expect_mismatch=False)
+        self._check_match_requests('GET', self.crypto_app)
+        self._check_match_requests('HEAD', self.crypto_app)
+
+    def _test_ondisk_data_after_write_with_crypto(self, policy_name):
+        policy = storage_policy.POLICIES.get_by_name(policy_name)
+        self._create_container(self.proxy_app, policy_name=policy_name)
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+
+        # Verify container listing etag is encrypted by direct GET to container
+        # server. We can use any server for all nodes since they all share same
+        # devices dir.
+        cont_server = self._test_context['test_servers'][3]
+        cont_ring = Ring(self._test_context['testdir'], ring_name='container')
+        part, nodes = cont_ring.get_nodes('a', self.container_name)
+        for node in nodes:
+            req = Request.blank('/%s/%s/a/%s'
+                                % (node['device'], part, self.container_name),
+                                method='GET', query_string='format=json')
+            resp = req.get_response(cont_server)
+            listing = json.loads(resp.body)
+            # sanity checks...
+            self.assertEqual(1, len(listing))
+            self.assertEqual('o', listing[0]['name'])
+            self.assertEqual('application/test', listing[0]['content_type'])
+            # verify encrypted etag value
+            parts = listing[0]['hash'].rsplit(';', 1)
+            crypto_meta_param = parts[1].strip()
+            crypto_meta = crypto_meta_param[len('swift_meta='):]
+            listing_etag_iv = load_crypto_meta(crypto_meta)['iv']
+            exp_enc_listing_etag = base64.b64encode(
+                encrypt(self.plaintext_etag,
+                        self.km.create_key('/a/%s' % self.container_name),
+                        listing_etag_iv))
+            self.assertEqual(exp_enc_listing_etag, parts[0])
+
+        # Verify diskfile data and metadata is encrypted
+        ring_object = self.proxy_app.get_object_ring(int(policy))
+        partition, nodes = ring_object.get_nodes('a', self.container_name, 'o')
+        conf = {'devices': self._test_context["testdir"],
+                'mount_check': 'false'}
+        df_mgr = diskfile.DiskFileRouter(conf, FakeLogger())[policy]
+        ondisk_data = []
+        exp_enc_body = None
+        for node_index, node in enumerate(nodes):
+            df = df_mgr.get_diskfile(node['device'], partition,
+                                     'a', self.container_name, 'o',
+                                     policy=policy)
+            with df.open():
+                meta = df.get_metadata()
+                contents = ''.join(df.reader())
+                metadata = dict((k.lower(), v) for k, v in meta.items())
+                # verify on disk data - body
+                body_iv = load_crypto_meta(
+                    metadata['x-object-sysmeta-crypto-body-meta'])['iv']
+                body_key_meta = load_crypto_meta(
+                    metadata['x-object-sysmeta-crypto-body-meta'])['body_key']
+                obj_key = self.km.create_key('/a/%s/o' % self.container_name)
+                body_key = Crypto().unwrap_key(obj_key, body_key_meta)
+                exp_enc_body = encrypt(self.plaintext, body_key, body_iv)
+                ondisk_data.append((node, contents))
+
+                # verify on disk user metadata
+                enc_val, meta = metadata[
+                    'x-object-transient-sysmeta-crypto-meta-fruit'].split(';')
+                meta = meta.strip()[len('swift_meta='):]
+                metadata_iv = load_crypto_meta(meta)['iv']
+                exp_enc_meta = base64.b64encode(encrypt('Kiwi', obj_key,
+                                                        metadata_iv))
+                self.assertEqual(exp_enc_meta, enc_val)
+                self.assertNotIn('x-object-meta-fruit', metadata)
+
+                self.assertIn(
+                    'x-object-transient-sysmeta-crypto-meta', metadata)
+                meta = load_crypto_meta(
+                    metadata['x-object-transient-sysmeta-crypto-meta'])
+                self.assertIn('key_id', meta)
+                self.assertIn('path', meta['key_id'])
+                self.assertEqual(
+                    '/a/%s/%s' % (self.container_name, self.object_name),
+                    meta['key_id']['path'])
+                self.assertIn('v', meta['key_id'])
+                self.assertEqual('1', meta['key_id']['v'])
+                self.assertIn('cipher', meta)
+                self.assertEqual(Crypto.cipher, meta['cipher'])
+
+                # verify etag
+                actual_enc_etag, _junk, actual_etag_meta = metadata[
+                    'x-object-sysmeta-crypto-etag'].partition('; swift_meta=')
+                etag_iv = load_crypto_meta(actual_etag_meta)['iv']
+                exp_enc_etag = base64.b64encode(encrypt(self.plaintext_etag,
+                                                        obj_key, etag_iv))
+                self.assertEqual(exp_enc_etag, actual_enc_etag)
+
+                # verify etag hmac
+                exp_etag_mac = hmac.new(
+                    obj_key, self.plaintext_etag, digestmod=hashlib.sha256)
+                exp_etag_mac = base64.b64encode(exp_etag_mac.digest())
+                self.assertEqual(exp_etag_mac,
+                                 metadata['x-object-sysmeta-crypto-etag-mac'])
+
+                # verify etag override for container updates
+                override = 'x-object-sysmeta-container-update-override-etag'
+                parts = metadata[override].rsplit(';', 1)
+                crypto_meta_param = parts[1].strip()
+                crypto_meta = crypto_meta_param[len('swift_meta='):]
+                listing_etag_iv = load_crypto_meta(crypto_meta)['iv']
+                cont_key = self.km.create_key('/a/%s' % self.container_name)
+                exp_enc_listing_etag = base64.b64encode(
+                    encrypt(self.plaintext_etag, cont_key,
+                            listing_etag_iv))
+                self.assertEqual(exp_enc_listing_etag, parts[0])
+
+        self._check_GET_and_HEAD(self.crypto_app)
+        return exp_enc_body, ondisk_data
+
+    def test_ondisk_data_after_write_with_crypto(self):
+        exp_body, ondisk_data = self._test_ondisk_data_after_write_with_crypto(
+            policy_name='one')
+        for node, body in ondisk_data:
+            self.assertEqual(exp_body, body)
+
+    def test_ondisk_data_after_write_with_crypto_ec(self):
+        exp_body, ondisk_data = self._test_ondisk_data_after_write_with_crypto(
+            policy_name='ec')
+        policy = storage_policy.POLICIES.get_by_name('ec')
+        for frag_selection in (ondisk_data[:2], ondisk_data[1:]):
+            frags = [frag for node, frag in frag_selection]
+            self.assertEqual(exp_body, policy.pyeclib_driver.decode(frags))
+
+    def _test_copy_encrypted_to_encrypted(
+            self, src_policy_name, dest_policy_name):
+        self._create_container(self.proxy_app, policy_name=src_policy_name)
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+
+        copy_crypto_app = copy.ServerSideCopyMiddleware(self.crypto_app, {})
+
+        dest_container = uuid.uuid4().hex
+        dest_container_path = 'http://localhost:8080/v1/a/' + dest_container
+        self._create_container(copy_crypto_app, policy_name=dest_policy_name,
+                               container_path=dest_container_path)
+        dest_obj_path = dest_container_path + '/o'
+        dest = '/%s/%s' % (dest_container, 'o')
+        self._copy_object(copy_crypto_app, dest)
+
+        self._check_GET_and_HEAD(copy_crypto_app, object_path=dest_obj_path)
+        self._check_listing(
+            copy_crypto_app, container_path=dest_container_path)
+        self._check_match_requests(
+            'GET', copy_crypto_app, object_path=dest_obj_path)
+        self._check_match_requests(
+            'HEAD', copy_crypto_app, object_path=dest_obj_path)
+
+    def test_copy_encrypted_to_encrypted(self):
+        self._test_copy_encrypted_to_encrypted('ec', 'ec')
+        self._test_copy_encrypted_to_encrypted('one', 'ec')
+        self._test_copy_encrypted_to_encrypted('ec', 'one')
+        self._test_copy_encrypted_to_encrypted('one', 'one')
+
+    def _test_copy_encrypted_to_unencrypted(
+            self, src_policy_name, dest_policy_name):
+        self._create_container(self.proxy_app, policy_name=src_policy_name)
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+
+        # make a pipeline with encryption disabled, use it to copy object
+        self._setup_crypto_app(disable_encryption=True)
+        copy_app = copy.ServerSideCopyMiddleware(self.crypto_app, {})
+
+        dest_container = uuid.uuid4().hex
+        dest_container_path = 'http://localhost:8080/v1/a/' + dest_container
+        self._create_container(self.crypto_app, policy_name=dest_policy_name,
+                               container_path=dest_container_path)
+        dest_obj_path = dest_container_path + '/o'
+        dest = '/%s/%s' % (dest_container, 'o')
+        self._copy_object(copy_app, dest)
+
+        self._check_GET_and_HEAD(copy_app, object_path=dest_obj_path)
+        self._check_GET_and_HEAD(self.proxy_app, object_path=dest_obj_path)
+        self._check_listing(copy_app, container_path=dest_container_path)
+        self._check_listing(self.proxy_app, container_path=dest_container_path)
+        self._check_match_requests(
+            'GET', self.proxy_app, object_path=dest_obj_path)
+        self._check_match_requests(
+            'HEAD', self.proxy_app, object_path=dest_obj_path)
+
+    def test_copy_encrypted_to_unencrypted(self):
+        self._test_copy_encrypted_to_unencrypted('ec', 'ec')
+        self._test_copy_encrypted_to_unencrypted('one', 'ec')
+        self._test_copy_encrypted_to_unencrypted('ec', 'one')
+        self._test_copy_encrypted_to_unencrypted('one', 'one')
+
+    def _test_copy_unencrypted_to_encrypted(
+            self, src_policy_name, dest_policy_name):
+        self._create_container(self.proxy_app, policy_name=src_policy_name)
+        self._put_object(self.proxy_app, self.plaintext)
+        self._post_object(self.proxy_app)
+
+        copy_crypto_app = copy.ServerSideCopyMiddleware(self.crypto_app, {})
+
+        dest_container = uuid.uuid4().hex
+        dest_container_path = 'http://localhost:8080/v1/a/' + dest_container
+        self._create_container(copy_crypto_app, policy_name=dest_policy_name,
+                               container_path=dest_container_path)
+        dest_obj_path = dest_container_path + '/o'
+        dest = '/%s/%s' % (dest_container, 'o')
+        self._copy_object(copy_crypto_app, dest)
+
+        self._check_GET_and_HEAD(copy_crypto_app, object_path=dest_obj_path)
+        self._check_listing(
+            copy_crypto_app, container_path=dest_container_path)
+        self._check_match_requests(
+            'GET', copy_crypto_app, object_path=dest_obj_path)
+        self._check_match_requests(
+            'HEAD', copy_crypto_app, object_path=dest_obj_path)
+
+    def test_copy_unencrypted_to_encrypted(self):
+        self._test_copy_unencrypted_to_encrypted('ec', 'ec')
+        self._test_copy_unencrypted_to_encrypted('one', 'ec')
+        self._test_copy_unencrypted_to_encrypted('ec', 'one')
+        self._test_copy_unencrypted_to_encrypted('one', 'one')
+
+    def test_crypto_max_length_path(self):
+        # the path is stashed in the key_id in crypto meta; check that a long
+        # path is ok
+        self.container_name = 'c' * constraints.MAX_CONTAINER_NAME_LENGTH
+        self.object_name = 'o' * constraints.MAX_OBJECT_NAME_LENGTH
+        self.container_path = 'http://foo:8080/v1/a/' + self.container_name
+        self.object_path = '%s/%s' % (self.container_path, self.object_name)
+
+        self._create_container(self.proxy_app, policy_name='one',
+                               container_path=self.container_path)
+
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+        self._check_GET_and_HEAD(self.crypto_app)
+        self._check_match_requests('GET', self.crypto_app)
+        self._check_match_requests('HEAD', self.crypto_app)
+        self._check_listing(self.crypto_app)
+
+    def test_crypto_UTF8_path(self):
+        # check that UTF8 path is ok
+        self.container_name = self.object_name = u'\u010brypto'
+        self.container_path = 'http://foo:8080/v1/a/' + self.container_name
+        self.object_path = '%s/%s' % (self.container_path, self.object_name)
+
+        self._create_container(self.proxy_app, policy_name='one',
+                               container_path=self.container_path)
+
+        self._put_object(self.crypto_app, self.plaintext)
+        self._post_object(self.crypto_app)
+        self._check_GET_and_HEAD(self.crypto_app)
+        self._check_match_requests('GET', self.crypto_app)
+        self._check_match_requests('HEAD', self.crypto_app)
+        self._check_listing(self.crypto_app)
+
+
+class TestCryptoPipelineChangesFastPost(TestCryptoPipelineChanges):
+    @classmethod
+    def setUpClass(cls):
+        # set proxy config to use fast post
+        extra_conf = {'object_post_as_copy': 'False'}
+        cls._test_context = setup_servers(extra_conf=extra_conf)
+        cls.proxy_app = cls._test_context["test_servers"][0]
+
+
+if __name__ == '__main__':
+    unittest.main()

test/unit/common/middleware/crypto/test_keymaster.py

@@ -0,0 +1,163 @@
+# -*- coding: utf-8 -*-
+#  Copyright (c) 2015 OpenStack Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import base64
+import os
+
+import unittest
+
+from swift.common import swob
+from swift.common.middleware.crypto import keymaster
+from swift.common.middleware.crypto.crypto_utils import CRYPTO_KEY_CALLBACK
+from swift.common.swob import Request
+from test.unit.common.middleware.helpers import FakeSwift, FakeAppThatExcepts
+from test.unit.common.middleware.crypto.crypto_helpers import (
+    TEST_KEYMASTER_CONF)
+
+
+def capture_start_response():
+    calls = []
+
+    def start_response(*args):
+        calls.append(args)
+    return start_response, calls
+
+
+class TestKeymaster(unittest.TestCase):
+
+    def setUp(self):
+        super(TestKeymaster, self).setUp()
+        self.swift = FakeSwift()
+        self.app = keymaster.KeyMaster(self.swift, TEST_KEYMASTER_CONF)
+
+    def test_object_path(self):
+        self.verify_keys_for_path(
+            '/a/c/o', expected_keys=('object', 'container'))
+
+    def test_container_path(self):
+        self.verify_keys_for_path(
+            '/a/c', expected_keys=('container',))
+
+    def verify_keys_for_path(self, path, expected_keys):
+        put_keys = None
+        for method, resp_class, status in (
+                ('PUT', swob.HTTPCreated, '201'),
+                ('POST', swob.HTTPAccepted, '202'),
+                ('GET', swob.HTTPOk, '200'),
+                ('HEAD', swob.HTTPNoContent, '204')):
+            resp_headers = {}
+            self.swift.register(
+                method, '/v1' + path, resp_class, resp_headers, '')
+            req = Request.blank(
+                '/v1' + path, environ={'REQUEST_METHOD': method})
+            start_response, calls = capture_start_response()
+            self.app(req.environ, start_response)
+            self.assertEqual(1, len(calls))
+            self.assertTrue(calls[0][0].startswith(status))
+            self.assertNotIn('swift.crypto.override', req.environ)
+            self.assertIn(CRYPTO_KEY_CALLBACK, req.environ,
+                          '%s not set in env' % CRYPTO_KEY_CALLBACK)
+            keys = req.environ.get(CRYPTO_KEY_CALLBACK)()
+            self.assertIn('id', keys)
+            id = keys.pop('id')
+            self.assertEqual(path, id['path'])
+            self.assertEqual('1', id['v'])
+            self.assertListEqual(sorted(expected_keys), sorted(keys.keys()),
+                                 '%s %s got keys %r, but expected %r'
+                                 % (method, path, keys.keys(), expected_keys))
+            if put_keys is not None:
+                # check all key sets were consistent for this path
+                self.assertDictEqual(put_keys, keys)
+            else:
+                put_keys = keys
+        return put_keys
+
+    def test_key_uniqueness(self):
+        # a rudimentary check that different keys are made for different paths
+        ref_path_parts = ('a1', 'c1', 'o1')
+        path = '/' + '/'.join(ref_path_parts)
+        ref_keys = self.verify_keys_for_path(
+            path, expected_keys=('object', 'container'))
+
+        # for same path and for each differing path check that keys are unique
+        # when path to object or container is unique and vice-versa
+        for path_parts in [(a, c, o) for a in ('a1', 'a2')
+                           for c in ('c1', 'c2')
+                           for o in ('o1', 'o2')]:
+            path = '/' + '/'.join(path_parts)
+            keys = self.verify_keys_for_path(
+                path, expected_keys=('object', 'container'))
+            # object keys should only be equal when complete paths are equal
+            self.assertEqual(path_parts == ref_path_parts,
+                             keys['object'] == ref_keys['object'],
+                             'Path %s keys:\n%s\npath %s keys\n%s' %
+                             (ref_path_parts, ref_keys, path_parts, keys))
+            # container keys should only be equal when paths to container are
+            # equal
+            self.assertEqual(path_parts[:2] == ref_path_parts[:2],
+                             keys['container'] == ref_keys['container'],
+                             'Path %s keys:\n%s\npath %s keys\n%s' %
+                             (ref_path_parts, ref_keys, path_parts, keys))
+
+    def test_filter(self):
+        factory = keymaster.filter_factory(TEST_KEYMASTER_CONF)
+        self.assertTrue(callable(factory))
+        self.assertTrue(callable(factory(self.swift)))
+
+    def test_app_exception(self):
+        app = keymaster.KeyMaster(
+            FakeAppThatExcepts(), TEST_KEYMASTER_CONF)
+        req = Request.blank('/', environ={'REQUEST_METHOD': 'PUT'})
+        start_response, _ = capture_start_response()
+        self.assertRaises(Exception, app, req.environ, start_response)
+
+    def test_root_secret(self):
+        for secret in (os.urandom(32), os.urandom(33), os.urandom(50)):
+            encoded_secret = base64.b64encode(secret)
+            try:
+                app = keymaster.KeyMaster(
+                    self.swift, {'encryption_root_secret':
+                                 bytes(encoded_secret)})
+                self.assertEqual(secret, app.root_secret)
+            except AssertionError as err:
+                self.fail(str(err) + ' for secret %s' % secret)
+            try:
+                app = keymaster.KeyMaster(
+                    self.swift, {'encryption_root_secret':
+                                 unicode(encoded_secret)})
+                self.assertEqual(secret, app.root_secret)
+            except AssertionError as err:
+                self.fail(str(err) + ' for secret %s' % secret)
+
+    def test_invalid_root_secret(self):
+        for secret in (bytes(base64.b64encode(os.urandom(31))),  # too short
+                       unicode(base64.b64encode(os.urandom(31))),
+                       u'?' * 44, b'?' * 44,  # not base64
+                       u'a' * 45, b'a' * 45,  # bad padding
+                       99, None):
+            conf = {'encryption_root_secret': secret}
+            try:
+                with self.assertRaises(ValueError) as err:
+                    keymaster.KeyMaster(self.swift, conf)
+                self.assertEqual(
+                    'encryption_root_secret option in proxy-server.conf '
+                    'must be a base64 encoding of at least 32 raw bytes',
+                    err.exception.message)
+            except AssertionError as err:
+                self.fail(str(err) + ' for conf %s' % str(conf))
+
+
+if __name__ == '__main__':
+    unittest.main()