6df278bea8
Summary: Fixes T12397. Ref T13164. See PHI801. Several installs have hit various use cases where the path on disk where Phabricator lives changes at runtime. Currently, `bin/ssh-auth` caches a flat file which includes the path to `bin/ssh-exec`, so this may fall out of date if `phabricator/` moves. These use cases have varying strengths of legitimacy, but "we're migrating to a new set of hosts and the pool is half old machines and half new machines" seems reasonably compelling and not a problem entirely of one's own making. Test Plan: - Compared output on `master` to output after change, found them byte-for-byte identical. - Moved `phabricator/` to `phabricator2/`, ran `bin/ssh-auth`, got updated output. - Added a new SSH key, saw it appear in the output. - Grepped for `AUTHFILE_CACHEKEY` (no hits). - Dropped the cache, verified that the file regenerates cleanly. Reviewers: amckinley Reviewed By: amckinley Maniphest Tasks: T13164, T12397 Differential Revision: https://secure.phabricator.com/D19568
123 lines
3.1 KiB
PHP
Executable File
123 lines
3.1 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 $root.'/scripts/init/init-script.php';
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// NOTE: We are caching a datastructure rather than the flat key file because
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// the path on disk to "ssh-exec" is arbitrarily mutable at runtime. See T12397.
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$cache = PhabricatorCaches::getMutableCache();
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$authstruct_key = PhabricatorAuthSSHKeyQuery::AUTHSTRUCT_CACHEKEY;
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$authstruct_raw = $cache->getKey($authstruct_key);
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$authstruct = null;
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if (strlen($authstruct_raw)) {
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try {
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$authstruct = phutil_json_decode($authstruct_raw);
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} catch (Exception $ex) {
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// Ignore any issues with the cached data; we'll just rebuild the
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// structure below.
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}
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}
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if ($authstruct === null) {
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$keys = id(new PhabricatorAuthSSHKeyQuery())
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->setViewer(PhabricatorUser::getOmnipotentUser())
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->withIsActive(true)
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->execute();
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if (!$keys) {
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echo pht('No keys found.')."\n";
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exit(1);
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}
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$key_list = array();
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foreach ($keys as $ssh_key) {
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$key_argv = array();
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$object = $ssh_key->getObject();
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if ($object instanceof PhabricatorUser) {
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$key_argv[] = '--phabricator-ssh-user';
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$key_argv[] = $object->getUsername();
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} else if ($object instanceof AlmanacDevice) {
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if (!$ssh_key->getIsTrusted()) {
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// If this key is not a trusted device key, don't allow SSH
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// authentication.
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continue;
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}
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$key_argv[] = '--phabricator-ssh-device';
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$key_argv[] = $object->getName();
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} else {
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// We don't know what sort of key this is; don't permit SSH auth.
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continue;
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}
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$key_argv[] = '--phabricator-ssh-key';
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$key_argv[] = $ssh_key->getID();
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// Strip out newlines and other nonsense from the key type and key body.
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$type = $ssh_key->getKeyType();
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$type = preg_replace('@[\x00-\x20]+@', '', $type);
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if (!strlen($type)) {
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continue;
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}
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$key = $ssh_key->getKeyBody();
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$key = preg_replace('@[\x00-\x20]+@', '', $key);
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if (!strlen($key)) {
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continue;
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}
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$key_list[] = array(
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'argv' => $key_argv,
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'type' => $type,
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'key' => $key,
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);
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}
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$authstruct = array(
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'keys' => $key_list,
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);
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$authstruct_raw = phutil_json_encode($authstruct);
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$ttl = phutil_units('24 hours in seconds');
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$cache->setKey($authstruct_key, $authstruct_raw, $ttl);
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}
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$bin = $root.'/bin/ssh-exec';
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$instance = PhabricatorEnv::getEnvConfig('cluster.instance');
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$lines = array();
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foreach ($authstruct['keys'] as $key_struct) {
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$key_argv = $key_struct['argv'];
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$key = $key_struct['key'];
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$type = $key_struct['type'];
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$cmd = csprintf('%s %Ls', $bin, $key_argv);
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if (strlen($instance)) {
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$cmd = csprintf('PHABRICATOR_INSTANCE=%s %C', $instance, $cmd);
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}
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// This is additional escaping for the SSH 'command="..."' string.
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$cmd = addcslashes($cmd, '"\\');
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$options = array(
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'command="'.$cmd.'"',
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'no-port-forwarding',
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'no-X11-forwarding',
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'no-agent-forwarding',
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'no-pty',
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);
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$options = implode(',', $options);
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$lines[] = $options.' '.$type.' '.$key."\n";
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}
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$authfile = implode('', $lines);
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echo $authfile;
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exit(0);
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