DiffusionServeController.php
2e7f2b735702stable

DiffusionServeController.php
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			<?php

			final class DiffusionServeController extends DiffusionController {

			public function isVCSRequest(AphrontRequest $request) {
			$identifier = $this->getRepositoryIdentifierFromRequest($request);
			if ($identifier === null) {
			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;
			}

			public function handleRequest(AphrontRequest $request) {
			$identifier = $this->getRepositoryIdentifierFromRequest($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)
			->withIdentifiers(array($identifier))
			->executeOne();
			if (!$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,
			$repository,
			DiffusionPushCapability::CAPABILITY);
			if (!$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:
			case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
			$result = $this->serveVCSRequest($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 serveVCSRequest(
			PhabricatorRepository $repository,
			PhabricatorUser $viewer) {

			// If this repository is hosted on a service, we need to proxy the request
			// to a host which can serve it.
			$is_cluster_request = $this->getRequest()->isProxiedClusterRequest();

			$uri = $repository->getAlmanacServiceURI(
			$viewer,
			$is_cluster_request,
			array(
			'http',
			'https',
			));
			if ($uri) {
			$future = $this->getRequest()->newClusterProxyFuture($uri);
			return id(new AphrontHTTPProxyResponse())
			->setHTTPFuture($future);
			}

			// Otherwise, we're going to handle the request locally.

			$vcs_type = $repository->getVersionControlSystem();
			switch ($vcs_type) {
			case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
			$result = $this->serveGitRequest($repository, $viewer);
			break;
			case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
			$result = $this->serveMercurialRequest($repository, $viewer);
			break;
			}

			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(
			pht(
			'Unable to find `%s` in %s!',
			'git-http-backend',
			'$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(
			pht(
			'Unable to find `%s` in %s!',
			'hg',
			'$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", $stdout, 2);
			if ($cmd == 'capabilities') {
			$body = DiffusionMercurialWireProtocol::filterBundle2Capability($body);
			}
			}

			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',
			);
			}

			}

phab/src/applications/diffusion/controller/DiffusionServeController.php2e7f2b735702stable

DiffusionServeController.phpView Options

phab/src/applications/diffusion/controller/DiffusionServeController.php
2e7f2b735702stable

DiffusionServeController.php
View Options