ssh-auth.php
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	#!/usr/bin/env php
	<?php

	$root = dirname(dirname(dirname(__FILE__)));
	require_once $root.'/scripts/__init_script__.php';

	$cache = PhabricatorCaches::getMutableCache();
	$authfile_key = PhabricatorAuthSSHKeyQuery::AUTHFILE_CACHEKEY;
	$authfile = $cache->getKey($authfile_key);

	if ($authfile === null) {
	$keys = id(new PhabricatorAuthSSHKeyQuery())
	->setViewer(PhabricatorUser::getOmnipotentUser())
	->withIsActive(true)
	->execute();

	if (!$keys) {
	echo pht('No keys found.')."\n";
	exit(1);
	}

	$bin = $root.'/bin/ssh-exec';
	foreach ($keys as $ssh_key) {
	$key_argv = array();
	$object = $ssh_key->getObject();
	if ($object instanceof PhabricatorUser) {
	$key_argv[] = '--phabricator-ssh-user';
	$key_argv[] = $object->getUsername();
	} else if ($object instanceof AlmanacDevice) {
	if (!$ssh_key->getIsTrusted()) {
	// If this key is not a trusted device key, don't allow SSH
	// authentication.
	continue;
	}
	$key_argv[] = '--phabricator-ssh-device';
	$key_argv[] = $object->getName();
	} else {
	// We don't know what sort of key this is; don't permit SSH auth.
	continue;
	}

	$key_argv[] = '--phabricator-ssh-key';
	$key_argv[] = $ssh_key->getID();

	$cmd = csprintf('%s %Ls', $bin, $key_argv);

	$instance = PhabricatorEnv::getEnvConfig('cluster.instance');
	if (strlen($instance)) {
	$cmd = csprintf('PHABRICATOR_INSTANCE=%s %C', $instance, $cmd);
	}

	// This is additional escaping for the SSH 'command="..."' string.
	$cmd = addcslashes($cmd, '"\\');

	// Strip out newlines and other nonsense from the key type and key body.

	$type = $ssh_key->getKeyType();
	$type = preg_replace('@[\x00-\x20]+@', '', $type);
	if (!strlen($type)) {
	continue;
	}

	$key = $ssh_key->getKeyBody();
	$key = preg_replace('@[\x00-\x20]+@', '', $key);
	if (!strlen($key)) {
	continue;
	}

	$options = array(
	'command="'.$cmd.'"',
	'no-port-forwarding',
	'no-X11-forwarding',
	'no-agent-forwarding',
	'no-pty',
	);
	$options = implode(',', $options);

	$lines[] = $options.' '.$type.' '.$key."\n";
	}

	$authfile = implode('', $lines);
	$ttl = phutil_units('24 hours in seconds');
	$cache->setKey($authfile_key, $authfile, $ttl);
	}

	echo $authfile;
	exit(0);

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