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<?php /** * This program 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. * * This program 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 Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ namespace MediaWiki\Shell; use Exception; use MediaWiki\ShellDisabledError; use Profiler; use Psr\Log\LoggerInterface; use Psr\Log\NullLogger; use Shellbox\Command\UnboxedCommand; use Shellbox\Command\UnboxedExecutor; use Shellbox\Command\UnboxedResult; use Stringable; use Wikimedia\ScopedCallback; /** * Class used for executing shell commands * * @since 1.30 */ class Command extends UnboxedCommand implements Stringable { private bool $everExecuted = false; /** @var string */ private $method; protected LoggerInterface $logger; /** * Don't call directly, instead use Shell::command() * * @param UnboxedExecutor $executor * @throws ShellDisabledError */ public function __construct( UnboxedExecutor $executor ) { if ( Shell::isDisabled() ) { throw new ShellDisabledError(); } parent::__construct( $executor ); $this->setLogger( new NullLogger() ); } /** * Makes sure the programmer didn't forget to execute the command after all */ public function __destruct() { if ( !$this->everExecuted ) { $context = [ 'command' => $this->getCommandString() ]; $message = __CLASS__ . " was instantiated, but execute() was never called."; if ( $this->method ) { $message .= ' Calling method: {method}.'; $context['method'] = $this->method; } $message .= ' Command: {command}'; $this->logger->warning( $message, $context ); } } /** * @param LoggerInterface $logger */ public function setLogger( LoggerInterface $logger ) { $this->logger = $logger; if ( $this->executor ) { $this->executor->setLogger( $logger ); } } /** * Sets execution limits * * @param array $limits Associative array of limits. Keys (all optional): * filesize (for ulimit -f), memory, time, walltime. * @return $this */ public function limits( array $limits ): Command { if ( !isset( $limits['walltime'] ) && isset( $limits['time'] ) ) { // Emulate the behavior of old wfShellExec() where walltime fell back on time // if the latter was overridden and the former wasn't $limits['walltime'] = $limits['time']; } if ( isset( $limits['filesize'] ) ) { $this->fileSizeLimit( $limits['filesize'] * 1024 ); } if ( isset( $limits['memory'] ) ) { $this->memoryLimit( $limits['memory'] * 1024 ); } if ( isset( $limits['time'] ) ) { $this->cpuTimeLimit( $limits['time'] ); } if ( isset( $limits['walltime'] ) ) { $this->wallTimeLimit( $limits['walltime'] ); } return $this; } /** * Sets calling function for profiler. By default, the caller for execute() will be used. * * @param string $method * @return $this */ public function profileMethod( string $method ): Command { $this->method = $method; return $this; } /** * Sends the provided input to the command. Defaults to an empty string. * If you want to pass stdin through to the command instead, use * passStdin(). * * @param string $inputString * @return $this */ public function input( string $inputString ): Command { return $this->stdin( $inputString ); } /** * Set restrictions for this request, overwriting any previously set restrictions. * * Add the "no network" restriction: * @code * $command->restrict( Shell::RESTRICT_DEFAULT | Shell::NO_NETWORK ); * @endcode * * Allow LocalSettings.php access: * @code * $command->restrict( Shell::RESTRICT_DEFAULT & ~Shell::NO_LOCALSETTINGS ); * @endcode * * Disable all restrictions: * @code * $command->restrict( Shell::RESTRICT_NONE ); * @endcode * * @deprecated since 1.36 Set the options using their separate accessors * * @since 1.31 * @param int $restrictions * @return $this */ public function restrict( int $restrictions ): Command { $this->privateUserNamespace( (bool)( $restrictions & Shell::NO_ROOT ) ); $this->firejailDefaultSeccomp( (bool)( $restrictions & Shell::SECCOMP ) ); $this->noNewPrivs( (bool)( $restrictions & Shell::SECCOMP ) ); $this->privateDev( (bool)( $restrictions & Shell::PRIVATE_DEV ) ); $this->disableNetwork( (bool)( $restrictions & Shell::NO_NETWORK ) ); if ( $restrictions & Shell::NO_EXECVE ) { $this->disabledSyscalls( [ 'execve' ] ); } else { $this->disabledSyscalls( [] ); } if ( $restrictions & Shell::NO_LOCALSETTINGS ) { $this->disallowedPaths( [ realpath( MW_CONFIG_FILE ) ] ); } else { $this->disallowedPaths( [] ); } if ( $restrictions === 0 ) { $this->disableSandbox(); } return $this; } /** * If called, only the files/directories that are * whitelisted will be available to the shell command. * * limit.sh will always be whitelisted * * @deprecated since 1.36 Use allowPath/disallowPath. Hard * deprecated in 1.40 and to be removed in 1.41 * @param string[] $paths * @return $this */ public function whitelistPaths( array $paths ): Command { wfDeprecated( __METHOD__, '1.36' ); $this->allowedPaths( array_merge( $this->getAllowedPaths(), $paths ) ); return $this; } /** * Executes command. Afterwards, getExitCode() and getOutput() can be used to access execution * results. * * @return UnboxedResult * @throws Exception */ public function execute(): UnboxedResult { $this->everExecuted = true; $profileMethod = $this->method ?: wfGetCaller(); $scoped = Profiler::instance()->scopedProfileIn( __FUNCTION__ . '-' . $profileMethod ); $result = parent::execute(); ScopedCallback::consume( $scoped ); return $result; } /** * Returns the final command line before environment/limiting, etc are applied. * Use string conversion only for debugging, don't try to pass this to * some other execution medium. * * @return string */ public function __toString(): string { return '#Command: ' . $this->getCommandString(); } }
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