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phorge-phorge/src/applications/diffusion/ssh/DiffusionGitUploadPackSSHWorkflow.php

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<?php
final class DiffusionGitUploadPackSSHWorkflow extends DiffusionGitSSHWorkflow {
protected function didConstruct() {
$this->setName('git-upload-pack');
$this->setArguments(
array(
array(
'name' => 'dir',
'wildcard' => true,
),
));
}
protected function executeRepositoryOperations() {
Prepare SSH connections for proxying Summary: Ref T7034. In a cluster environment, when a user connects with a VCS request over SSH (like `git pull`), the receiving server may need to proxy it to a server which can actually satisfy the request. In order to proxy the request, we need to know which repository the user is interested in accessing. Split the SSH workflow into two steps: # First, identify the repository. # Then, execute the operation. In the future, this will allow us to put a possible "proxy the whole thing somewhere else" step in the middle, mirroring the behavior of Conduit. This is trivially easy in `git` and `hg`. Both identify the repository on the commmand line. This is fiendishly complex in `svn`, for the same reasons that hosting SVN was hard in the first place. Specifically: - The client doesn't tell us what it's after. - To get it to tell us, we have to send it a server capabilities string //first//. - We can't just start an `svnserve` process and read the repository out after a little while, because we may need to proxy the request once we figure out the repository. - We can't consume the client protocol frame that tells us what the client wants, because when we start the real server request it won't know what the client is after if it never receives that frame. - On the other hand, we must consume the second copy of the server protocol frame that would be sent to the client, or they'll get two "HELLO" messages and not know what to do. The approach here is straightforward, but the implementation is not trivial. Roughly: - Start `svnserve`, read the "hello" frame from it. - Kill `svnserve`. - Send the "hello" to the client. - Wait for the client to send us "I want repository X". - Save the message it sent us in the "peekBuffer". - Return "this is a request for repository X", so we can proxy it. Then, to continue the request: - Start the real `svnserve`. - Read the "hello" frame from it and throw it away. - Write the data in the "peekBuffer" to it, as though we'd just received it from the client. - State of the world is normal again, so we can continue. Also fixed some other issues: - SVN could choke if `repository.default-local-path` contained extra slashes. - PHP might emit some complaints when executing the commit hook; silence those. Test Plan: Pushed and pulled repositories in SVN, Mercurial and Git. Reviewers: btrahan Reviewed By: btrahan Subscribers: epriestley Maniphest Tasks: T7034 Differential Revision: https://secure.phabricator.com/D11541
2015-01-28 19:18:07 +01:00
$repository = $this->getRepository();
if ($this->shouldProxy()) {
$command = $this->getProxyCommand();
} else {
$command = csprintf('git-upload-pack -- %s', $repository->getLocalPath());
}
Add "phd.user" with `sudo` hooks for SSH/HTTP writes Summary: Ref T2230. When fully set up, we have up to three users who all need to write into the repositories: - The webserver needs to write for HTTP receives. - The SSH user needs to write for SSH receives. - The daemons need to write for "git fetch", "git clone", etc. These three users don't need to be different, but in practice they are often not likely to all be the same user. If for no other reason, making them all the same user requires you to "git clone httpd@host.com", and installs are likely to prefer "git clone git@host.com". Using three different users also allows better privilege separation. Particularly, the daemon user can be the //only// user with write access to the repositories. The webserver and SSH user can accomplish their writes through `sudo`, with a whitelisted set of commands. This means that even if you compromise the `ssh` user, you need to find a way to escallate from there to the daemon user in order to, e.g., write arbitrary stuff into the repository or bypass commit hooks. This lays some of the groundwork for a highly-separated configuration where the SSH and HTTP users have the fewest privileges possible and use `sudo` to interact with repositories. Some future work which might make sense: - Make `bin/phd` respect this (require start as the right user, or as root and drop privileges, if this configuration is set). - Execute all `git/hg/svn` commands via sudo? Users aren't expected to configure this yet so I haven't written any documentation. Test Plan: Added an SSH user ("dweller") and gave it sudo by adding this to `/etc/sudoers`: dweller ALL=(epriestley) SETENV: NOPASSWD: /usr/bin/git-upload-pack, /usr/bin/git-receive-pack Then I ran git pushes and pulls over SSH via "dweller@localhost". They successfully interacted with the repository on disk as the "epriestley" user. Reviewers: btrahan Reviewed By: btrahan CC: aran Maniphest Tasks: T2230 Differential Revision: https://secure.phabricator.com/D7589
2013-11-18 17:58:35 +01:00
$command = PhabricatorDaemon::sudoCommandAsDaemonUser($command);
$future = id(new ExecFuture('%C', $command))
->setEnv($this->getEnvironment());
$err = $this->newPassthruCommand()
->setIOChannel($this->getIOChannel())
->setCommandChannelFromExecFuture($future)
->execute();
if (!$err) {
$this->waitForGitClient();
}
return $err;
}
}