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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 | <?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; } } |