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indefero/src/IDF/Plugin/SyncGit/Serve.php

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PHP
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<?php
/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
# ***** BEGIN LICENSE BLOCK *****
# This file is part of InDefero, an open source project management application.
# Copyright (C) 2008 Céondo Ltd and contributors.
#
# InDefero is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# InDefero is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# ***** END LICENSE BLOCK ***** */
/**
* Main application to serve git repositories through a restricted SSH
* access.
*/
class IDF_Plugin_SyncGit_Serve
{
/**
* Regular expression to match the path in the git command.
*/
public $preg = '#^\'/*(?P<path>[a-zA-Z0-9][a-zA-Z0-9@._-]*(/[a-zA-Z0-9][a-zA-Z0-9@._-]*)*)\'$#';
public $commands_readonly = array('git-upload-pack', 'git upload-pack');
public $commands_write = array('git-receive-pack', 'git receive-pack');
/**
* Serve a git request.
*
* @param string Username.
* @param string Command to be run.
*/
public function serve($username, $cmd)
{
if (false !== strpos($cmd, "\n")) {
throw new Exception('Command may not contain newline.');
}
$splitted = preg_split('/\s/', $cmd, 2);
if (count($splitted) != 2) {
throw new Exception('Unknown command denied.');
}
if ($splitted[0] == 'git') {
$sub_splitted = preg_split('/\s/', $splitted[1], 2);
if (count($sub_splitted) != 2) {
throw new Exception('Unknown command denied.');
}
$verb = sprintf('%s %s', $splitted[0], $sub_splitted[0]);
$args = $sub_splitted[1];
} else {
$verb = $splitted[0];
$args = $splitted[1];
}
if (!in_array($verb, $this->commands_write)
and !in_array($verb, $this->commands_readonly)) {
throw new Exception('Unknown command denied.');
}
if (!preg_match($this->preg, $args, $matches)) {
throw new Exception('Arguments to command look dangerous.');
}
$path = $matches['path'];
// Check read/write rights
$new_path = $this->haveAccess($username, $path, 'writable');
if ($new_path == false) {
$new_path = $this->haveAccess($username, $path, 'readonly');
if ($new_path == false) {
throw new Exception('Repository read access denied.');
}
if (in_array($verb, $this->commands_write)) {
throw new Exception('Repository write access denied.');
}
}
list($topdir, $relpath) = $new_path;
$repopath = sprintf('%s.git', $relpath);
$fullpath = $topdir.DIRECTORY_SEPARATOR.$repopath;
if (!file_exists($fullpath)
and in_array($verb, $this->commands_write)) {
// it doesn't exist on the filesystem, but the
// configuration refers to it, we're serving a write
// request, and the user is authorized to do that: create
// the repository on the fly
$p = explode(DIRECTORY_SEPARATOR, $fullpath);
$mpath = implode(DIRECTORY_SEPARATOR, array_slice($p, 0, -1));
mkdir($mpath, 0750, true);
$this->initRepository($fullpath);
$this->setGitExport($relpath, $fullpath);
}
$new_cmd = sprintf("%s '%s'", $verb, $fullpath);
return $new_cmd;
}
/**
* Main function called by the serve script.
*/
public static function main($argv, $env)
{
if (count($argv) != 2) {
self::fatalError('Missing argument USER.');
}
$username = $argv[1];
umask(0022);
if (!isset($env['SSH_ORIGINAL_COMMAND'])) {
self::fatalError('Need SSH_ORIGINAL_COMMAND in environment.');
}
$cmd = $env['SSH_ORIGINAL_COMMAND'];
chdir(Pluf::f('idf_plugin_syncgit_git_home_dir', '/home/git'));
$serve = new IDF_Plugin_SyncGit_Serve();
try {
$new_cmd = $serve->serve($username, $cmd);
} catch (Exception $e) {
self::fatalError($e->getMessage());
}
print $new_cmd;
exit(0);
}
/**
* Control the access rights to the repository.
*
* @param string Username
* @param string Path including the possible .git
* @param string Type of access. 'readonly' or ('writable')
* @return mixed False or array(base_git_reps, relative path to repo)
*/
public function haveAccess($username, $path, $mode='writable')
{
if ('.git' == substr($path, -4)) {
$path = substr($path, 0, -4);
}
$sql = new Pluf_SQL('shortname=%s', array($path));
$projects = Pluf::factory('IDF_Project')->getList(array('filter'=>$sql->gen()));
if ($projects->count() != 1) {
return false;
}
$project = $projects[0];
$conf = new IDF_Conf();
$conf->setProject($project);
$scm = $conf->getVal('scm', 'git');
if ($scm != 'git') {
return false;
}
$sql = new Pluf_SQL('login=%s', array($username));
$users = Pluf::factory('Pluf_User')->getList(array('filter'=>$sql->gen()));
if ($users->count() != 1 or !$users[0]->active) {
return false;
}
$user = $users[0];
$request = new StdClass();
$request->user = $user;
$request->conf = $conf;
$request->project = $project;
if (true === IDF_Precondition::accessTabGeneric($request, 'source_access_rights')) {
if ($mode == 'readonly') {
return array(Pluf::f('idf_plugin_syncgit_base_repositories', '/home/git/repositories'),
$project->shortname);
}
if (true === IDF_Precondition::projectMemberOrOwner($request)) {
return array(Pluf::f('idf_plugin_syncgit_base_repositories', '/home/git/repositories'),
$project->shortname);
}
}
return false;
}
/**
* Die on a message on stderr.
*
* @param string Message
*/
public static function fatalError($mess)
{
fwrite(STDERR, $mess."\n");
exit(1);
}
/**
* Init a new empty bare repository.
*
* @param string Full path to the repository
*/
public function initRepository($fullpath)
{
mkdir($fullpath, 0750, true);
exec(sprintf(Pluf::f('idf_exec_cmd_prefix', '').
Pluf::f('git_path', 'git').' --git-dir=%s init', escapeshellarg($fullpath)),
$out, $res);
if ($res != 0) {
throw new Exception(sprintf('Init repository error, exit status %d.', $res));
}
}
/**
* Set the git export value.
*
* @param string Relative path of the repository (not .git)
* @param string Full path of the repository with .git
*/
public function setGitExport($relpath, $fullpath)
{
$sql = new Pluf_SQL('shortname=%s', array($relpath));
$projects = Pluf::factory('IDF_Project')->getList(array('filter'=>$sql->gen()));
if ($projects->count() != 1) {
return $this->gitExportDeny($fullpath);
}
$project = $projects[0];
$conf = new IDF_Conf();
$conf->setProject($project);
$scm = $conf->getVal('scm', 'git');
if ($scm == 'git' and !file_exists($fullpath)) {
$this->initRepository($fullpath);
}
if ($scm != 'git' or $project->private) {
return $this->gitExportDeny($fullpath);
}
if ('all' == $conf->getVal('source_access_rights', 'all')) {
return $this->gitExportAllow($fullpath);
}
return $this->gitExportDeny($fullpath);
}
/**
* Remove the export flag.
*
* @param string Full path to the repository
*/
public function gitExportDeny($fullpath)
{
if (!file_exists($fullpath)) {
return; // Not created yet.
}
@unlink($fullpath.DIRECTORY_SEPARATOR.'git-daemon-export-ok');
if (file_exists($fullpath.DIRECTORY_SEPARATOR.'git-daemon-export-ok')) {
throw new Exception('Cannot remove git-daemon-export-ok file.');
}
return true;
}
/**
* Set the export flag.
*
* @param string Full path to the repository
*/
public function gitExportAllow($fullpath)
{
if (!file_exists($fullpath)) {
return; // Not created yet.
}
touch($fullpath.DIRECTORY_SEPARATOR.'git-daemon-export-ok');
if (!file_exists($fullpath.DIRECTORY_SEPARATOR.'git-daemon-export-ok')) {
throw new Exception('Cannot create git-daemon-export-ok file.');
}
return true;
}
}
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