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DiffusionSSHWorkflow.php
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Sun, Dec 1, 10:42

DiffusionSSHWorkflow.php
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<?php
abstract class DiffusionSSHWorkflow extends PhabricatorSSHWorkflow {
private $args;
private $repository;
private $hasWriteAccess;
private $proxyURI;
private $baseRequestPath;
public function getRepository() {
if (!$this->repository) {
throw new Exception(pht('Repository is not available yet!'));
}
return $this->repository;
}
private function setRepository(PhabricatorRepository $repository) {
$this->repository = $repository;
return $this;
}
public function getArgs() {
return $this->args;
}
public function getEnvironment() {
$env = array(
DiffusionCommitHookEngine::ENV_USER => $this->getUser()->getUsername(),
DiffusionCommitHookEngine::ENV_REMOTE_PROTOCOL => 'ssh',
);
$remote_address = $this->getSSHRemoteAddress();
if ($remote_address !== null) {
$env[DiffusionCommitHookEngine::ENV_REMOTE_ADDRESS] = $remote_address;
}
return $env;
}
/**
* Identify and load the affected repository.
*/
abstract protected function identifyRepository();
abstract protected function executeRepositoryOperations();
protected function getBaseRequestPath() {
return $this->baseRequestPath;
}
protected function writeError($message) {
$this->getErrorChannel()->write($message);
return $this;
}
protected function getCurrentDeviceName() {
$device = AlmanacKeys::getLiveDevice();
if ($device) {
return $device->getName();
}
return php_uname('n');
}
protected function getTargetDeviceName() {
// TODO: This should use the correct device identity.
$uri = new PhutilURI($this->proxyURI);
return $uri->getDomain();
}
protected function shouldProxy() {
return (bool)$this->proxyURI;
}
protected function getProxyCommand() {
$uri = new PhutilURI($this->proxyURI);
$username = AlmanacKeys::getClusterSSHUser();
if ($username === null) {
throw new Exception(
pht(
'Unable to determine the username to connect with when trying '.
'to proxy an SSH request within the Phabricator cluster.'));
}
$port = $uri->getPort();
$host = $uri->getDomain();
$key_path = AlmanacKeys::getKeyPath('device.key');
if (!Filesystem::pathExists($key_path)) {
throw new Exception(
pht(
'Unable to proxy this SSH request within the cluster: this device '.
'is not registered and has a missing device key (expected to '.
'find key at "%s").',
$key_path));
}
$options = array();
$options[] = '-o';
$options[] = 'StrictHostKeyChecking=no';
$options[] = '-o';
$options[] = 'UserKnownHostsFile=/dev/null';
// This is suppressing "added <address> to the list of known hosts"
// messages, which are confusing and irrelevant when they arise from
// proxied requests. It might also be suppressing lots of useful errors,
// of course. Ideally, we would enforce host keys eventually.
$options[] = '-o';
$options[] = 'LogLevel=quiet';
// NOTE: We prefix the command with "@username", which the far end of the
// connection will parse in order to act as the specified user. This
// behavior is only available to cluster requests signed by a trusted
// device key.
return csprintf(
'ssh %Ls -l %s -i %s -p %s %s -- %s %Ls',
$options,
$username,
$key_path,
$port,
$host,
'@'.$this->getUser()->getUsername(),
$this->getOriginalArguments());
}
final public function execute(PhutilArgumentParser $args) {
$this->args = $args;
$viewer = $this->getUser();
$have_diffusion = PhabricatorApplication::isClassInstalledForViewer(
'PhabricatorDiffusionApplication',
$viewer);
if (!$have_diffusion) {
throw new Exception(
pht(
'You do not have permission to access the Diffusion application, '.
'so you can not interact with repositories over SSH.'));
}
$repository = $this->identifyRepository();
$this->setRepository($repository);
$is_cluster_request = $this->getIsClusterRequest();
$uri = $repository->getAlmanacServiceURI(
$viewer,
$is_cluster_request,
array(
'ssh',
));
if ($uri) {
$this->proxyURI = $uri;
}
try {
return $this->executeRepositoryOperations();
} catch (Exception $ex) {
$this->writeError(get_class($ex).': '.$ex->getMessage());
return 1;
}
}
protected function loadRepositoryWithPath($path, $vcs) {
$viewer = $this->getUser();
$info = PhabricatorRepository::parseRepositoryServicePath($path, $vcs);
if ($info === null) {
throw new Exception(
pht(
'Unrecognized repository path "%s". Expected a path like "%s", '.
'"%s", or "%s".',
$path,
'/diffusion/X/',
'/diffusion/123/',
'/source/thaumaturgy.git'));
}
$identifier = $info['identifier'];
$base = $info['base'];
$this->baseRequestPath = $base;
$repository = id(new PhabricatorRepositoryQuery())
->setViewer($viewer)
->withIdentifiers(array($identifier))
->needURIs(true)
->executeOne();
if (!$repository) {
throw new Exception(
pht('No repository "%s" exists!', $identifier));
}
$protocol = PhabricatorRepositoryURI::BUILTIN_PROTOCOL_SSH;
if (!$repository->canServeProtocol($protocol, false)) {
throw new Exception(
pht(
'This repository ("%s") is not available over SSH.',
$repository->getDisplayName()));
}
return $repository;
}
protected function requireWriteAccess($protocol_command = null) {
if ($this->hasWriteAccess === true) {
return;
}
$repository = $this->getRepository();
$viewer = $this->getUser();
if ($viewer->isOmnipotent()) {
throw new Exception(
pht(
'This request is authenticated as a cluster device, but is '.
'performing a write. Writes must be performed with a real '.
'user account.'));
}
$protocol = PhabricatorRepositoryURI::BUILTIN_PROTOCOL_SSH;
if ($repository->canServeProtocol($protocol, true)) {
$can_push = PhabricatorPolicyFilter::hasCapability(
$viewer,
$repository,
DiffusionPushCapability::CAPABILITY);
if (!$can_push) {
throw new Exception(
pht('You do not have permission to push to this repository.'));
}
} else {
if ($protocol_command !== null) {
throw new Exception(
pht(
'This repository is read-only over SSH (tried to execute '.
'protocol command "%s").',
$protocol_command));
} else {
throw new Exception(
pht('This repository is read-only over SSH.'));
}
}
$this->hasWriteAccess = true;
return $this->hasWriteAccess;
}
protected function shouldSkipReadSynchronization() {
$viewer = $this->getUser();
// Currently, the only case where devices interact over SSH without
// assuming user credentials is when synchronizing before a read. These
// synchronizing reads do not themselves need to be synchronized.
if ($viewer->isOmnipotent()) {
return true;
}
return false;
}
protected function newPullEvent() {
$viewer = $this->getViewer();
$repository = $this->getRepository();
$remote_address = $this->getSSHRemoteAddress();
return id(new PhabricatorRepositoryPullEvent())
->setEpoch(PhabricatorTime::getNow())
->setRemoteAddress($remote_address)
->setRemoteProtocol('ssh')
->setPullerPHID($viewer->getPHID())
->setRepositoryPHID($repository->getPHID());
}
}

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