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888b3839e7
Summary: Fixes T2229. This sets the stage for a patch similar to D7417, but for SSH. In particular, SSH 6.2 introduced an `AuthorizedKeysCommand` directive, which lets us do this in a mostly-reasonable way without needing users to patch sshd (if they have a recent enough version, at least). The way the `AuthorizedKeysCommand` works is that it gets run and produces an `authorized_keys`-style file fragment. This isn't ideal, because we have to dump every key into the result, but should be fine for most installs. The earlier patch against `sshd` passes the public key itself, which allows the script to just look up the key. We might use this eventually, since it can scale much better, so I haven't removed it. Generally, auth is split into two scripts now which mostly do the same thing: - `ssh-auth` is the AuthorizedKeysCommand auth, which takes nothing and dumps the whole keyfile. - `ssh-auth-key` is the slightly cleaner and more scalable (but patch-dependent) version, which takes the public key and dumps only matching options. I also reworked the argument parsing to be a bit more sane. Test Plan: This is somewhat-intentionally a bit obtuse since I don't really want anyone using it yet, but basically: - Copy `phabricator-ssh-hook.sh` to somewhere like `/usr/libexec/openssh/`, chown it `root` and chmod it `500`. - This script should probably also do a username check in the future. - Create a copy of `sshd_config` and fix the paths/etc. Point the KeyScript at your copy of the hook. - Start a copy of sshd (6.2 or newer) with `-f <your config file>` and maybe `-d -d -d` to foreground and debug. - Run `ssh -p 2222 localhost` or similar. Specifically, I did this setup and then ran a bunch of commands like: - `ssh host` (denied, no command) - `ssh host ls` (denied, not supported) - `echo '{}' | ssh host conduit conduit.ping` (works) Reviewers: btrahan Reviewed By: btrahan CC: hach-que, aran Maniphest Tasks: T2229, T2230 Differential Revision: https://secure.phabricator.com/D7419
61 lines
1.1 KiB
PHP
Executable file
61 lines
1.1 KiB
PHP
Executable file
#!/usr/bin/env php
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<?php
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$root = dirname(dirname(dirname(__FILE__)));
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require_once $root.'/scripts/__init_script__.php';
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$cert = file_get_contents('php://stdin');
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if (!$cert) {
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exit(1);
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}
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$parts = preg_split('/\s+/', $cert);
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if (count($parts) < 2) {
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exit(1);
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}
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list($type, $body) = $parts;
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$user_dao = new PhabricatorUser();
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$ssh_dao = new PhabricatorUserSSHKey();
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$conn_r = $user_dao->establishConnection('r');
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$row = queryfx_one(
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$conn_r,
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'SELECT userName FROM %T u JOIN %T ssh ON u.phid = ssh.userPHID
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WHERE ssh.keyType = %s AND ssh.keyBody = %s',
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$user_dao->getTableName(),
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$ssh_dao->getTableName(),
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$type,
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$body);
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if (!$row) {
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exit(1);
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}
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$user = idx($row, 'userName');
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if (!$user) {
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exit(1);
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}
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if (!PhabricatorUser::validateUsername($user)) {
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exit(1);
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}
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$bin = $root.'/bin/ssh-exec';
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$cmd = csprintf('%s --phabricator-ssh-user %s', $bin, $user);
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// This is additional escaping for the SSH 'command="..."' string.
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$cmd = addcslashes($cmd, '"\\');
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$options = array(
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'command="'.$cmd.'"',
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'no-port-forwarding',
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'no-X11-forwarding',
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'no-agent-forwarding',
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'no-pty',
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);
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echo implode(',', $options);
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exit(0);
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