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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | */ |
| 20 | |
| 21 | namespace MediaWiki\Shell; |
| 22 | |
| 23 | use Exception; |
| 24 | use MediaWiki\ShellDisabledError; |
| 25 | use Profiler; |
| 26 | use Psr\Log\LoggerInterface; |
| 27 | use Psr\Log\NullLogger; |
| 28 | use Shellbox\Command\UnboxedCommand; |
| 29 | use Shellbox\Command\UnboxedExecutor; |
| 30 | use Shellbox\Command\UnboxedResult; |
| 31 | use Wikimedia\ScopedCallback; |
| 32 | |
| 33 | /** |
| 34 | * Class used for executing shell commands |
| 35 | * |
| 36 | * @since 1.30 |
| 37 | */ |
| 38 | class Command extends UnboxedCommand { |
| 39 | private bool $everExecuted = false; |
| 40 | |
| 41 | /** @var string */ |
| 42 | private $method; |
| 43 | |
| 44 | protected LoggerInterface $logger; |
| 45 | |
| 46 | /** |
| 47 | * Don't call directly, instead use Shell::command() |
| 48 | * |
| 49 | * @param UnboxedExecutor $executor |
| 50 | * @throws ShellDisabledError |
| 51 | */ |
| 52 | public function __construct( UnboxedExecutor $executor ) { |
| 53 | if ( Shell::isDisabled() ) { |
| 54 | throw new ShellDisabledError(); |
| 55 | } |
| 56 | parent::__construct( $executor ); |
| 57 | $this->setLogger( new NullLogger() ); |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Makes sure the programmer didn't forget to execute the command after all |
| 62 | */ |
| 63 | public function __destruct() { |
| 64 | if ( !$this->everExecuted ) { |
| 65 | $context = [ 'command' => $this->getCommandString() ]; |
| 66 | $message = __CLASS__ . " was instantiated, but execute() was never called."; |
| 67 | if ( $this->method ) { |
| 68 | $message .= ' Calling method: {method}.'; |
| 69 | $context['method'] = $this->method; |
| 70 | } |
| 71 | $message .= ' Command: {command}'; |
| 72 | $this->logger->warning( $message, $context ); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * @param LoggerInterface $logger |
| 78 | */ |
| 79 | public function setLogger( LoggerInterface $logger ) { |
| 80 | $this->logger = $logger; |
| 81 | if ( $this->executor ) { |
| 82 | $this->executor->setLogger( $logger ); |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Sets execution limits |
| 88 | * |
| 89 | * @param array $limits Associative array of limits. Keys (all optional): |
| 90 | * filesize (for ulimit -f), memory, time, walltime. |
| 91 | * @return $this |
| 92 | */ |
| 93 | public function limits( array $limits ): Command { |
| 94 | if ( !isset( $limits['walltime'] ) && isset( $limits['time'] ) ) { |
| 95 | // Emulate the behavior of old wfShellExec() where walltime fell back on time |
| 96 | // if the latter was overridden and the former wasn't |
| 97 | $limits['walltime'] = $limits['time']; |
| 98 | } |
| 99 | if ( isset( $limits['filesize'] ) ) { |
| 100 | $this->fileSizeLimit( $limits['filesize'] * 1024 ); |
| 101 | } |
| 102 | if ( isset( $limits['memory'] ) ) { |
| 103 | $this->memoryLimit( $limits['memory'] * 1024 ); |
| 104 | } |
| 105 | if ( isset( $limits['time'] ) ) { |
| 106 | $this->cpuTimeLimit( $limits['time'] ); |
| 107 | } |
| 108 | if ( isset( $limits['walltime'] ) ) { |
| 109 | $this->wallTimeLimit( $limits['walltime'] ); |
| 110 | } |
| 111 | |
| 112 | return $this; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Sets calling function for profiler. By default, the caller for execute() will be used. |
| 117 | * |
| 118 | * @param string $method |
| 119 | * @return $this |
| 120 | */ |
| 121 | public function profileMethod( string $method ): Command { |
| 122 | $this->method = $method; |
| 123 | |
| 124 | return $this; |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Sends the provided input to the command. Defaults to an empty string. |
| 129 | * If you want to pass stdin through to the command instead, use |
| 130 | * passStdin(). |
| 131 | * |
| 132 | * @param string $inputString |
| 133 | * @return $this |
| 134 | */ |
| 135 | public function input( string $inputString ): Command { |
| 136 | return $this->stdin( $inputString ); |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Set restrictions for this request, overwriting any previously set restrictions. |
| 141 | * |
| 142 | * Add the "no network" restriction: |
| 143 | * @code |
| 144 | * $command->restrict( Shell::RESTRICT_DEFAULT | Shell::NO_NETWORK ); |
| 145 | * @endcode |
| 146 | * |
| 147 | * Allow LocalSettings.php access: |
| 148 | * @code |
| 149 | * $command->restrict( Shell::RESTRICT_DEFAULT & ~Shell::NO_LOCALSETTINGS ); |
| 150 | * @endcode |
| 151 | * |
| 152 | * Disable all restrictions: |
| 153 | * @code |
| 154 | * $command->restrict( Shell::RESTRICT_NONE ); |
| 155 | * @endcode |
| 156 | * |
| 157 | * @deprecated since 1.36 Set the options using their separate accessors |
| 158 | * |
| 159 | * @since 1.31 |
| 160 | * @param int $restrictions |
| 161 | * @return $this |
| 162 | */ |
| 163 | public function restrict( int $restrictions ): Command { |
| 164 | $this->privateUserNamespace( (bool)( $restrictions & Shell::NO_ROOT ) ); |
| 165 | $this->firejailDefaultSeccomp( (bool)( $restrictions & Shell::SECCOMP ) ); |
| 166 | $this->noNewPrivs( (bool)( $restrictions & Shell::SECCOMP ) ); |
| 167 | $this->privateDev( (bool)( $restrictions & Shell::PRIVATE_DEV ) ); |
| 168 | $this->disableNetwork( (bool)( $restrictions & Shell::NO_NETWORK ) ); |
| 169 | if ( $restrictions & Shell::NO_EXECVE ) { |
| 170 | $this->disabledSyscalls( [ 'execve' ] ); |
| 171 | } else { |
| 172 | $this->disabledSyscalls( [] ); |
| 173 | } |
| 174 | if ( $restrictions & Shell::NO_LOCALSETTINGS ) { |
| 175 | $this->disallowedPaths( [ realpath( MW_CONFIG_FILE ) ] ); |
| 176 | } else { |
| 177 | $this->disallowedPaths( [] ); |
| 178 | } |
| 179 | if ( $restrictions === 0 ) { |
| 180 | $this->disableSandbox(); |
| 181 | } |
| 182 | |
| 183 | return $this; |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * If called, only the files/directories that are |
| 188 | * whitelisted will be available to the shell command. |
| 189 | * |
| 190 | * limit.sh will always be whitelisted |
| 191 | * |
| 192 | * @deprecated since 1.36 Use allowPath/disallowPath. Hard |
| 193 | * deprecated in 1.40 and to be removed in 1.41 |
| 194 | * @param string[] $paths |
| 195 | * @return $this |
| 196 | */ |
| 197 | public function whitelistPaths( array $paths ): Command { |
| 198 | wfDeprecated( __METHOD__, '1.36' ); |
| 199 | $this->allowedPaths( array_merge( $this->getAllowedPaths(), $paths ) ); |
| 200 | return $this; |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Executes command. Afterwards, getExitCode() and getOutput() can be used to access execution |
| 205 | * results. |
| 206 | * |
| 207 | * @return UnboxedResult |
| 208 | * @throws Exception |
| 209 | */ |
| 210 | public function execute(): UnboxedResult { |
| 211 | $this->everExecuted = true; |
| 212 | $profileMethod = $this->method ?: wfGetCaller(); |
| 213 | $scoped = Profiler::instance()->scopedProfileIn( __FUNCTION__ . '-' . $profileMethod ); |
| 214 | $result = parent::execute(); |
| 215 | ScopedCallback::consume( $scoped ); |
| 216 | return $result; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Returns the final command line before environment/limiting, etc are applied. |
| 221 | * Use string conversion only for debugging, don't try to pass this to |
| 222 | * some other execution medium. |
| 223 | * |
| 224 | * @return string |
| 225 | */ |
| 226 | public function __toString(): string { |
| 227 | return '#Command: ' . $this->getCommandString(); |
| 228 | } |
| 229 | } |