Dimitris Glezos wrote:
Hi all. There is a darkish cloud of security uncertainty in my sky (and Fedora's!), so it's better to discuss this as early as possible to avoid any late notices. I'm working on a web app that will help translation submission by allowing fedora translators (members of cvsl10n group) to commit translations to systems they don't have direct access to. Think: hosted.fpo (svn/hg/git). https://hosted.fedoraproject.org/projects/transifex The idea is that transifex will act as a proxy/mediator for translation commits. A translator will login to the transifex instance running on a host like `translate.fpo`, choose a module, a PO file to upload, and a destination file and click "submit". The system will commit the file for him. Underneath this is achieved by having the VCS admin create a user (eg. fedora-transifex) with a dedicated SSH key, and give it write access to the specific modules accepting translations. The transifex admin will then hook the repo and module up with the system. Each commit will be done by the "fedora-transifex" user, and the actual user's details (name, surname, email, fedora username) will be written in the commit message and Changelog file. Transifex supports filaname filters, so even if a module maintainer can't add ACLs to the repo, he can define them on the transifex side; for example, .*/po/(LINGUAS|Changelog|.*po$). To put things in perspective, if we do this *right*, then *any* remote VCS could be hooked up. In the future, we could add a layer of "approval" before commits, so that the language maintainer (which we probably trust more than a john doe user with cvsl10n access) approves queued messages to be pushed. Or, we could give the option to a dev (for DVCS) to pull instead of the webapp to push. To the implementation details now, transifex will become the client to the remote VCSs. Once the user clicks "submit PO", the webapp should commit (and push). The security question is how do we handle SSH keys? - Where do we store them? Best place would be ~/.ssh/, because not all VCS commands support SSH options to point to a different config file. - Right before running the checkout/pull and checkin/push commands, the environment should be right so that the commands run by the webapp will succeed over SSH. So an option the webapp (just like anyone) will have to "type" the passphrase to unlock the key. Or, use ssh-agent. And probably SELinux. What's the best approach with the minimum compromise risk? - Where are we going to actually store the keys and passphrase? On-disk or in the DB? If we store them encrypted, where do we store the salt? - Do we need a different process running that handles these security requests? Seeking the knowledge and experience of the wise, the humble developer comes to you with seriously cold feet.
I'm surprised no one commented on this, I suspect they didn't read it :) How did your paramiko search go?
-Mike
