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Infrastructure Systems

Infrastructure Systems

The OpenStack CI team maintains a number of systems that are critical to the operation of the OpenStack project. At the time of writing, these include:

  • Gerrit (review.openstack.org)
  • Jenkins (jenkins.openstack.org)
  • community.openstack.org

Additionally the team maintains the project sites on Launchpad and GitHub. The following policies have been adopted to ensure the continued and secure operation of the project.

SSH Access

For any of the systems managed by the CI team, the following practices must be observed for SSH access:

  • SSH access is only permitted with SSH public/private key authentication.
  • Users must use a strong passphrase to protect their private key. A passphrase of several words, at least one of which is not in a dictionary is advised, or a random string of at least 16 characters.
  • To mitigate the inconvenience of using a long passphrase, users may want to use an SSH agent so that the passphrase is only requested once per desktop session.
  • Users private keys must never be stored anywhere except their own workstation(s). In particular, they must never be stored on any remote server.
  • If users need to 'hop' from a server or bastion host to another machine, they must not copy a private key to the intermediate machine (see above). Instead SSH agent forwarding may be used. However due to the potential for a compromised intermediate machine to ask the agent to sign requests without the users knowledge, in this case only an SSH agent that interactively prompts the user each time a signing request (ie, ssh-agent, but not gnome-keyring) is received should be used, and the SSH keys should be added with the confirmation constraint ('ssh-add -c').
  • The number of SSH keys that are configured to permit access to OpenStack machines should be kept to a minimum.
  • OpenStack CI machines must use puppet to centrally manage and configure user accounts, and the SSH authorized_keys files from the openstack-ci-puppet repository.
  • SSH keys should be periodically rotated (at least once per year). During rotation, a new key can be added to puppet for a time, and then the old one removed. Be sure to run puppet on the backup servers to make sure they are updated.

Backups

Off-site backups are made to two servers:

  • ci-backup-rs-ord.openstack.org
  • ci-backup-hp-az1.openstack.org

Puppet is used to perform the initial configuration of those machines, but to protect them from unauthorized access in case access to the puppet git repo is compromised, it is not run in agent or in cron mode on them. Instead, it should be manually run when changes are made that should be applied to the backup servers.

To start backing up a server, some commands need to be run manually on both the backup server, and the server to be backed up. On the server to be backed up:

ssh-keygen -t rsa -f /root/.ssh/id_rsa -N ""

And then ''cat /root/.ssh/id_rsa.pub'' for use later.

On the backup servers:

sudo su -
BUPUSER=bup-<short-servername>  # eg, bup-jenkins-dev
useradd -r $BUPUSER -s /bin/bash -m 
cd /home/$BUPUSER
mkdir .ssh
cat >.ssh/authorized_keys

and add this to the authorized_keys file:

command="BUP_DEBUG=0 BUP_FORCE_TTY=3 bup server",no-port-forwarding,no-agent-forwarding,no-X11-forwarding,no-pty <ssh key from earlier>

Switching back to the server to be backed up, run:

ssh $BUPUSER@ci-backup-rs-ord.openstack.org
ssh $BUPUSER@ci-backup-hp-az1.openstack.org

And verify the host key. Add the "backup" class in puppet to the server to be backed up.

GitHub Access

To ensure that code review and testing are not bypassed in the public Git repositories, only Gerrit will be permitted to commit code to OpenStack repositories. Because GitHub always allows project administrators to commit code, accounts that have access to manage the GitHub projects necessarily will have commit access to the repositories. Therefore, to avoid inadvertent commits to the public repositories, unique administrative-only accounts must be used to manage the OpenStack GitHub organization and projects. These accounts will not be used to check out or commit code for any project.

Launchpad Teams

Each OpenStack project should have the following teams on Launchpad:

  • foo -- contributors to project 'foo'
  • foo-core -- core developers
  • foo-bugs -- people interested in receieving bug reports
  • foo-drivers -- people who may approve and target blueprints

The openstack-admins team should be a member of each of those teams.