DiffusionServeController.php
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Created: Sat, Jan 11, 00:01

DiffusionServeController.php
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	<?php

	final class DiffusionServeController extends DiffusionController {

	public static function isVCSRequest(AphrontRequest $request) {
	if (!self::getCallsign($request)) {
	return null;
	}

	$content_type = $request->getHTTPHeader('Content-Type');
	$user_agent = idx($_SERVER, 'HTTP_USER_AGENT');

	$vcs = null;
	if ($request->getExists('service')) {
	$service = $request->getStr('service');
	// We get this initially for `info/refs`.
	// Git also gives us a User-Agent like "git/1.8.2.3".
	$vcs = PhabricatorRepositoryType::REPOSITORY_TYPE_GIT;
	} else if (strncmp($user_agent, 'git/', 4) === 0) {
	$vcs = PhabricatorRepositoryType::REPOSITORY_TYPE_GIT;
	} else if ($content_type == 'application/x-git-upload-pack-request') {
	// We get this for `git-upload-pack`.
	$vcs = PhabricatorRepositoryType::REPOSITORY_TYPE_GIT;
	} else if ($content_type == 'application/x-git-receive-pack-request') {
	// We get this for `git-receive-pack`.
	$vcs = PhabricatorRepositoryType::REPOSITORY_TYPE_GIT;
	} else if ($request->getExists('cmd')) {
	// Mercurial also sends an Accept header like
	// "application/mercurial-0.1", and a User-Agent like
	// "mercurial/proto-1.0".
	$vcs = PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL;
	} else {
	// Subversion also sends an initial OPTIONS request (vs GET/POST), and
	// has a User-Agent like "SVN/1.8.3 (x86_64-apple-darwin11.4.2)
	// serf/1.3.2".
	$dav = $request->getHTTPHeader('DAV');
	$dav = new PhutilURI($dav);
	if ($dav->getDomain() === 'subversion.tigris.org') {
	$vcs = PhabricatorRepositoryType::REPOSITORY_TYPE_SVN;
	}
	}

	return $vcs;
	}

	private static function getCallsign(AphrontRequest $request) {
	$uri = $request->getRequestURI();

	$regex = '@^/diffusion/(?P<callsign>[A-Z]+)(/\|$)@';
	$matches = null;
	if (!preg_match($regex, (string)$uri, $matches)) {
	return null;
	}

	return $matches['callsign'];
	}

	public function processRequest() {
	$request = $this->getRequest();
	$callsign = self::getCallsign($request);

	// If authentication credentials have been provided, try to find a user
	// that actually matches those credentials.
	if (isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) {
	$username = $_SERVER['PHP_AUTH_USER'];
	$password = new PhutilOpaqueEnvelope($_SERVER['PHP_AUTH_PW']);

	$viewer = $this->authenticateHTTPRepositoryUser($username, $password);
	if (!$viewer) {
	return new PhabricatorVCSResponse(
	403,
	pht('Invalid credentials.'));
	}
	} else {
	// User hasn't provided credentials, which means we count them as
	// being "not logged in".
	$viewer = new PhabricatorUser();
	}

	$allow_public = PhabricatorEnv::getEnvConfig('policy.allow-public');
	$allow_auth = PhabricatorEnv::getEnvConfig('diffusion.allow-http-auth');
	if (!$allow_public) {
	if (!$viewer->isLoggedIn()) {
	if ($allow_auth) {
	return new PhabricatorVCSResponse(
	401,
	pht('You must log in to access repositories.'));
	} else {
	return new PhabricatorVCSResponse(
	403,
	pht('Public and authenticated HTTP access are both forbidden.'));
	}
	}
	}

	try {
	$repository = id(new PhabricatorRepositoryQuery())
	->setViewer($viewer)
	->withCallsigns(array($callsign))
	->executeOne();
	if (!$repository) {
	return new PhabricatorVCSResponse(
	404,
	pht('No such repository exists.'));
	}
	} catch (PhabricatorPolicyException $ex) {
	if ($viewer->isLoggedIn()) {
	return new PhabricatorVCSResponse(
	403,
	pht('You do not have permission to access this repository.'));
	} else {
	if ($allow_auth) {
	return new PhabricatorVCSResponse(
	401,
	pht('You must log in to access this repository.'));
	} else {
	return new PhabricatorVCSResponse(
	403,
	pht(
	'This repository requires authentication, which is forbidden '.
	'over HTTP.'));
	}
	}
	}

	if (!$repository->isTracked()) {
	return new PhabricatorVCSResponse(
	403,
	pht('This repository is inactive.'));
	}

	$is_push = !$this->isReadOnlyRequest($repository);

	switch ($repository->getServeOverHTTP()) {
	case PhabricatorRepository::SERVE_READONLY:
	if ($is_push) {
	return new PhabricatorVCSResponse(
	403,
	pht('This repository is read-only over HTTP.'));
	}
	break;
	case PhabricatorRepository::SERVE_READWRITE:
	if ($is_push) {
	$can_push = PhabricatorPolicyFilter::hasCapability(
	$viewer,
	$repository,
	DiffusionCapabilityPush::CAPABILITY);
	if (!$can_push) {
	if ($viewer->isLoggedIn()) {
	return new PhabricatorVCSResponse(
	403,
	pht('You do not have permission to push to this repository.'));
	} else {
	if ($allow_auth) {
	return new PhabricatorVCSResponse(
	401,
	pht('You must log in to push to this repository.'));
	} else {
	return new PhabricatorVCSResponse(
	403,
	pht(
	'Pushing to this repository requires authentication, '.
	'which is forbidden over HTTP.'));
	}
	}
	}
	}
	break;
	case PhabricatorRepository::SERVE_OFF:
	default:
	return new PhabricatorVCSResponse(
	403,
	pht('This repository is not available over HTTP.'));
	}

	$vcs_type = $repository->getVersionControlSystem();
	$req_type = $this->isVCSRequest($request);

	if ($vcs_type != $req_type) {
	switch ($req_type) {
	case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
	$result = new PhabricatorVCSResponse(
	500,
	pht('This is not a Git repository.'));
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
	$result = new PhabricatorVCSResponse(
	500,
	pht('This is not a Mercurial repository.'));
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
	$result = new PhabricatorVCSResponse(
	500,
	pht('This is not a Subversion repository.'));
	break;
	default:
	$result = new PhabricatorVCSResponse(
	500,
	pht('Unknown request type.'));
	break;
	}
	} else {
	switch ($vcs_type) {
	case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
	$result = $this->serveGitRequest($repository, $viewer);
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
	$result = $this->serveMercurialRequest($repository, $viewer);
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
	$result = new PhabricatorVCSResponse(
	500,
	pht(
	'Phabricator does not support HTTP access to Subversion '.
	'repositories.'));
	break;
	default:
	$result = new PhabricatorVCSResponse(
	500,
	pht('Unknown version control system.'));
	break;
	}
	}

	$code = $result->getHTTPResponseCode();

	if ($is_push && ($code == 200)) {
	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	$repository->writeStatusMessage(
	PhabricatorRepositoryStatusMessage::TYPE_NEEDS_UPDATE,
	PhabricatorRepositoryStatusMessage::CODE_OKAY);
	unset($unguarded);
	}

	return $result;
	}

	private function isReadOnlyRequest(
	PhabricatorRepository $repository) {
	$request = $this->getRequest();
	$method = $_SERVER['REQUEST_METHOD'];

	// TODO: This implementation is safe by default, but very incomplete.

	switch ($repository->getVersionControlSystem()) {
	case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
	$service = $request->getStr('service');
	$path = $this->getRequestDirectoryPath($repository);
	// NOTE: Service names are the reverse of what you might expect, as they
	// are from the point of view of the server. The main read service is
	// "git-upload-pack", and the main write service is "git-receive-pack".

	if ($method == 'GET' &&
	$path == '/info/refs' &&
	$service == 'git-upload-pack') {
	return true;
	}

	if ($path == '/git-upload-pack') {
	return true;
	}

	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
	$cmd = $request->getStr('cmd');
	if ($cmd == 'batch') {
	$cmds = idx($this->getMercurialArguments(), 'cmds');
	return DiffusionMercurialWireProtocol::isReadOnlyBatchCommand($cmds);
	}
	return DiffusionMercurialWireProtocol::isReadOnlyCommand($cmd);
	case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
	break;
	}

	return false;
	}

	/**
	* @phutil-external-symbol class PhabricatorStartup
	*/
	private function serveGitRequest(
	PhabricatorRepository $repository,
	PhabricatorUser $viewer) {
	$request = $this->getRequest();

	$request_path = $this->getRequestDirectoryPath($repository);
	$repository_root = $repository->getLocalPath();

	// Rebuild the query string to strip `__magic__` parameters and prevent
	// issues where we might interpret inputs like "service=read&service=write"
	// differently than the server does and pass it an unsafe command.

	// NOTE: This does not use getPassthroughRequestParameters() because
	// that code is HTTP-method agnostic and will encode POST data.

	$query_data = $_GET;
	foreach ($query_data as $key => $value) {
	if (!strncmp($key, '__', 2)) {
	unset($query_data[$key]);
	}
	}
	$query_string = http_build_query($query_data, '', '&');

	// We're about to wipe out PATH with the rest of the environment, so
	// resolve the binary first.
	$bin = Filesystem::resolveBinary('git-http-backend');
	if (!$bin) {
	throw new Exception('Unable to find `git-http-backend` in PATH!');
	}

	$env = array(
	'REQUEST_METHOD' => $_SERVER['REQUEST_METHOD'],
	'QUERY_STRING' => $query_string,
	'CONTENT_TYPE' => $request->getHTTPHeader('Content-Type'),
	'HTTP_CONTENT_ENCODING' => $request->getHTTPHeader('Content-Encoding'),
	'REMOTE_ADDR' => $_SERVER['REMOTE_ADDR'],
	'GIT_PROJECT_ROOT' => $repository_root,
	'GIT_HTTP_EXPORT_ALL' => '1',
	'PATH_INFO' => $request_path,

	'REMOTE_USER' => $viewer->getUsername(),

	// TODO: Set these correctly.
	// GIT_COMMITTER_NAME
	// GIT_COMMITTER_EMAIL
	) + $this->getCommonEnvironment($viewer);

	$input = PhabricatorStartup::getRawInput();

	$command = csprintf('%s', $bin);
	$command = PhabricatorDaemon::sudoCommandAsDaemonUser($command);

	list($err, $stdout, $stderr) = id(new ExecFuture('%C', $command))
	->setEnv($env, true)
	->write($input)
	->resolve();

	if ($err) {
	if ($this->isValidGitShallowCloneResponse($stdout, $stderr)) {
	// Ignore the error if the response passes this special check for
	// validity.
	$err = 0;
	}
	}

	if ($err) {
	return new PhabricatorVCSResponse(
	500,
	pht('Error %d: %s', $err, $stderr));
	}

	return id(new DiffusionGitResponse())->setGitData($stdout);
	}

	private function getRequestDirectoryPath(PhabricatorRepository $repository) {
	$request = $this->getRequest();
	$request_path = $request->getRequestURI()->getPath();
	$base_path = preg_replace('@^/diffusion/[A-Z]+@', '', $request_path);

	// For Git repositories, strip an optional directory component if it
	// isn't the name of a known Git resource. This allows users to clone
	// repositories as "/diffusion/X/anything.git", for example.
	if ($repository->isGit()) {
	$known = array(
	'info',
	'git-upload-pack',
	'git-receive-pack',
	);

	foreach ($known as $key => $path) {
	$known[$key] = preg_quote($path, '@');
	}

	$known = implode('\|', $known);

	if (preg_match('@^/([^/]+)/('.$known.')(/\|$)@', $base_path)) {
	$base_path = preg_replace('@^/([^/]+)@', '', $base_path);
	}
	}

	return $base_path;
	}

	private function authenticateHTTPRepositoryUser(
	$username,
	PhutilOpaqueEnvelope $password) {

	if (!PhabricatorEnv::getEnvConfig('diffusion.allow-http-auth')) {
	// No HTTP auth permitted.
	return null;
	}

	if (!strlen($username)) {
	// No username.
	return null;
	}

	if (!strlen($password->openEnvelope())) {
	// No password.
	return null;
	}

	$user = id(new PhabricatorPeopleQuery())
	->setViewer(PhabricatorUser::getOmnipotentUser())
	->withUsernames(array($username))
	->executeOne();
	if (!$user) {
	// Username doesn't match anything.
	return null;
	}

	if (!$user->isUserActivated()) {
	// User is not activated.
	return null;
	}

	$password_entry = id(new PhabricatorRepositoryVCSPassword())
	->loadOneWhere('userPHID = %s', $user->getPHID());
	if (!$password_entry) {
	// User doesn't have a password set.
	return null;
	}

	if (!$password_entry->comparePassword($password, $user)) {
	// Password doesn't match.
	return null;
	}

	// If the user's password is stored using a less-than-optimal hash, upgrade
	// them to the strongest available hash.

	$hash_envelope = new PhutilOpaqueEnvelope(
	$password_entry->getPasswordHash());
	if (PhabricatorPasswordHasher::canUpgradeHash($hash_envelope)) {
	$password_entry->setPassword($password, $user);
	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	$password_entry->save();
	unset($unguarded);
	}

	return $user;
	}

	private function serveMercurialRequest(
	PhabricatorRepository $repository,
	PhabricatorUser $viewer) {
	$request = $this->getRequest();

	$bin = Filesystem::resolveBinary('hg');
	if (!$bin) {
	throw new Exception('Unable to find `hg` in PATH!');
	}

	$env = $this->getCommonEnvironment($viewer);
	$input = PhabricatorStartup::getRawInput();

	$cmd = $request->getStr('cmd');

	$args = $this->getMercurialArguments();
	$args = $this->formatMercurialArguments($cmd, $args);

	if (strlen($input)) {
	$input = strlen($input)."\n".$input."0\n";
	}

	$command = csprintf('%s serve --stdio', $bin);
	$command = PhabricatorDaemon::sudoCommandAsDaemonUser($command);

	list($err, $stdout, $stderr) = id(new ExecFuture('%C', $command))
	->setEnv($env, true)
	->setCWD($repository->getLocalPath())
	->write("{$cmd}\n{$args}{$input}")
	->resolve();

	if ($err) {
	return new PhabricatorVCSResponse(
	500,
	pht('Error %d: %s', $err, $stderr));
	}

	if ($cmd == 'getbundle' \|\|
	$cmd == 'changegroup' \|\|
	$cmd == 'changegroupsubset') {
	// We're not completely sure that "changegroup" and "changegroupsubset"
	// actually work, they're for very old Mercurial.
	$body = gzcompress($stdout);
	} else if ($cmd == 'unbundle') {
	// This includes diagnostic information and anything echoed by commit
	// hooks. We ignore `stdout` since it just has protocol garbage, and
	// substitute `stderr`.
	$body = strlen($stderr)."\n".$stderr;
	} else {
	list($length, $body) = explode("\n", $stdout, 2);
	}

	return id(new DiffusionMercurialResponse())->setContent($body);
	}


	private function getMercurialArguments() {
	// Mercurial sends arguments in HTTP headers. "Why?", you might wonder,
	// "Why would you do this?".

	$args_raw = array();
	for ($ii = 1;; $ii++) {
	$header = 'HTTP_X_HGARG_'.$ii;
	if (!array_key_exists($header, $_SERVER)) {
	break;
	}
	$args_raw[] = $_SERVER[$header];
	}
	$args_raw = implode('', $args_raw);

	return id(new PhutilQueryStringParser())
	->parseQueryString($args_raw);
	}

	private function formatMercurialArguments($command, array $arguments) {
	$spec = DiffusionMercurialWireProtocol::getCommandArgs($command);

	$out = array();

	// Mercurial takes normal arguments like this:
	//
	// name <length(value)>
	// value

	$has_star = false;
	foreach ($spec as $arg_key) {
	if ($arg_key == '*') {
	$has_star = true;
	continue;
	}
	if (isset($arguments[$arg_key])) {
	$value = $arguments[$arg_key];
	$size = strlen($value);
	$out[] = "{$arg_key} {$size}\n{$value}";
	unset($arguments[$arg_key]);
	}
	}

	if ($has_star) {

	// Mercurial takes arguments for variable argument lists roughly like
	// this:
	//
	// * <count(args)>
	// argname1 <length(argvalue1)>
	// argvalue1
	// argname2 <length(argvalue2)>
	// argvalue2

	$count = count($arguments);

	$out[] = "* {$count}\n";

	foreach ($arguments as $key => $value) {
	if (in_array($key, $spec)) {
	// We already added this argument above, so skip it.
	continue;
	}
	$size = strlen($value);
	$out[] = "{$key} {$size}\n{$value}";
	}
	}

	return implode('', $out);
	}

	private function isValidGitShallowCloneResponse($stdout, $stderr) {
	// If you execute `git clone --depth N ...`, git sends a request which
	// `git-http-backend` responds to by emitting valid output and then exiting
	// with a failure code and an error message. If we ignore this error,
	// everything works.

	// This is a pretty funky fix: it would be nice to more precisely detect
	// that a request is a `--depth N` clone request, but we don't have any code
	// to decode protocol frames yet. Instead, look for reasonable evidence
	// in the error and output that we're looking at a `--depth` clone.

	// For evidence this isn't completely crazy, see:
	// https://github.com/schacon/grack/pull/7

	$stdout_regexp = '(^Content-Type: application/x-git-upload-pack-result)m';
	$stderr_regexp = '(The remote end hung up unexpectedly)';

	$has_pack = preg_match($stdout_regexp, $stdout);
	$is_hangup = preg_match($stderr_regexp, $stderr);

	return $has_pack && $is_hangup;
	}

	private function getCommonEnvironment(PhabricatorUser $viewer) {
	$remote_addr = $this->getRequest()->getRemoteAddr();

	return array(
	DiffusionCommitHookEngine::ENV_USER => $viewer->getUsername(),
	DiffusionCommitHookEngine::ENV_REMOTE_ADDRESS => $remote_addr,
	DiffusionCommitHookEngine::ENV_REMOTE_PROTOCOL => 'http',
	);
	}

	}

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