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[mediawiki.git] / includes / user / PasswordReset.php

<?php
/**
 * User password reset helper for MediaWiki.
 *
 * 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
 */

use MediaWiki\Auth\AuthManager;
use MediaWiki\Auth\TemporaryPasswordAuthenticationRequest;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerInterface;
use MediaWiki\Logger\LoggerFactory;

/**
 * Helper class for the password reset functionality shared by the web UI and the API.
 *
 * Requires the TemporaryPasswordPrimaryAuthenticationProvider and the
 * EmailNotificationSecondaryAuthenticationProvider (or something providing equivalent
 * functionality) to be enabled.
 */
class PasswordReset implements LoggerAwareInterface {
        /** @var Config */
        protected $config;

        /** @var AuthManager */
        protected $authManager;

        /** @var LoggerInterface */
        protected $logger;

        /**
         * In-process cache for isAllowed lookups, by username.
         * Contains a StatusValue object
         * @var HashBagOStuff
         */
        private $permissionCache;

        public function __construct( Config $config, AuthManager $authManager ) {
                $this->config = $config;
                $this->authManager = $authManager;
                $this->permissionCache = new HashBagOStuff( [ 'maxKeys' => 1 ] );
                $this->logger = LoggerFactory::getInstance( 'authentication' );
        }

        /**
         * Set the logger instance to use.
         *
         * @param LoggerInterface $logger
         * @since 1.29
         */
        public function setLogger( LoggerInterface $logger ) {
                $this->logger = $logger;
        }

        /**
         * Check if a given user has permission to use this functionality.
         * @param User $user
         * @param bool $displayPassword If set, also check whether the user is allowed to reset the
         *   password of another user and see the temporary password.
         * @since 1.29 Second argument for displayPassword removed.
         * @return StatusValue
         */
        public function isAllowed( User $user ) {
                $status = $this->permissionCache->get( $user->getName() );
                if ( !$status ) {
                        $resetRoutes = $this->config->get( 'PasswordResetRoutes' );
                        $status = StatusValue::newGood();

                        if ( !is_array( $resetRoutes ) ||
                                 !in_array( true, array_values( $resetRoutes ), true )
                        ) {
                                // Maybe password resets are disabled, or there are no allowable routes
                                $status = StatusValue::newFatal( 'passwordreset-disabled' );
                        } elseif (
                                ( $providerStatus = $this->authManager->allowsAuthenticationDataChange(
                                        new TemporaryPasswordAuthenticationRequest(), false ) )
                                && !$providerStatus->isGood()
                        ) {
                                // Maybe the external auth plugin won't allow local password changes
                                $status = StatusValue::newFatal( 'resetpass_forbidden-reason',
                                        $providerStatus->getMessage() );
                        } elseif ( !$this->config->get( 'EnableEmail' ) ) {
                                // Maybe email features have been disabled
                                $status = StatusValue::newFatal( 'passwordreset-emaildisabled' );
                        } elseif ( !$user->isAllowed( 'editmyprivateinfo' ) ) {
                                // Maybe not all users have permission to change private data
                                $status = StatusValue::newFatal( 'badaccess' );
                        } elseif ( $user->isBlocked() ) {
                                // Maybe the user is blocked (check this here rather than relying on the parent
                                // method as we have a more specific error message to use here
                                $status = StatusValue::newFatal( 'blocked-mailpassword' );
                        }

                        $this->permissionCache->set( $user->getName(), $status );
                }

                return $status;
        }

        /**
         * Do a password reset. Authorization is the caller's responsibility.
         *
         * Process the form.  At this point we know that the user passes all the criteria in
         * userCanExecute(), and if the data array contains 'Username', etc, then Username
         * resets are allowed.
         *
         * @since 1.29 Fourth argument for displayPassword removed.
         * @param User $performingUser The user that does the password reset
         * @param string $username The user whose password is reset
         * @param string $email Alternative way to specify the user
         * @return StatusValue Will contain the passwords as a username => password array if the
         *   $displayPassword flag was set
         * @throws LogicException When the user is not allowed to perform the action
         * @throws MWException On unexpected DB errors
         */
        public function execute(
                User $performingUser, $username = null, $email = null
        ) {
                if ( !$this->isAllowed( $performingUser )->isGood() ) {
                        throw new LogicException( 'User ' . $performingUser->getName()
                                . ' is not allowed to reset passwords' );
                }

                $resetRoutes = $this->config->get( 'PasswordResetRoutes' )
                        + [ 'username' => false, 'email' => false ];
                if ( $resetRoutes['username'] && $username ) {
                        $method = 'username';
                        $users = [ User::newFromName( $username ) ];
                        $email = null;
                } elseif ( $resetRoutes['email'] && $email ) {
                        if ( !Sanitizer::validateEmail( $email ) ) {
                                return StatusValue::newFatal( 'passwordreset-invalidemail' );
                        }
                        $method = 'email';
                        $users = $this->getUsersByEmail( $email );
                        $username = null;
                } else {
                        // The user didn't supply any data
                        return StatusValue::newFatal( 'passwordreset-nodata' );
                }

                // Check for hooks (captcha etc), and allow them to modify the users list
                $error = [];
                $data = [
                        'Username' => $username,
                        'Email' => $email,
                ];
                if ( !Hooks::run( 'SpecialPasswordResetOnSubmit', [ &$users, $data, &$error ] ) ) {
                        return StatusValue::newFatal( Message::newFromSpecifier( $error ) );
                }

                if ( !$users ) {
                        if ( $method === 'email' ) {
                                // Don't reveal whether or not an email address is in use
                                return StatusValue::newGood( [] );
                        } else {
                                return StatusValue::newFatal( 'noname' );
                        }
                }

                $firstUser = $users[0];

                if ( !$firstUser instanceof User || !$firstUser->getId() ) {
                        // Don't parse username as wikitext (bug 65501)
                        return StatusValue::newFatal( wfMessage( 'nosuchuser', wfEscapeWikiText( $username ) ) );
                }

                // Check against the rate limiter
                if ( $performingUser->pingLimiter( 'mailpassword' ) ) {
                        return StatusValue::newFatal( 'actionthrottledtext' );
                }

                // All the users will have the same email address
                if ( !$firstUser->getEmail() ) {
                        // This won't be reachable from the email route, so safe to expose the username
                        return StatusValue::newFatal( wfMessage( 'noemail',
                                wfEscapeWikiText( $firstUser->getName() ) ) );
                }

                // We need to have a valid IP address for the hook, but per bug 18347, we should
                // send the user's name if they're logged in.
                $ip = $performingUser->getRequest()->getIP();
                if ( !$ip ) {
                        return StatusValue::newFatal( 'badipaddress' );
                }

                Hooks::run( 'User::mailPasswordInternal', [ &$performingUser, &$ip, &$firstUser ] );

                $result = StatusValue::newGood();
                $reqs = [];
                foreach ( $users as $user ) {
                        $req = TemporaryPasswordAuthenticationRequest::newRandom();
                        $req->username = $user->getName();
                        $req->mailpassword = true;
                        $req->caller = $performingUser->getName();
                        $status = $this->authManager->allowsAuthenticationDataChange( $req, true );
                        if ( $status->isGood() && $status->getValue() !== 'ignored' ) {
                                $reqs[] = $req;
                        } elseif ( $result->isGood() ) {
                                // only record the first error, to avoid exposing the number of users having the
                                // same email address
                                if ( $status->getValue() === 'ignored' ) {
                                        $status = StatusValue::newFatal( 'passwordreset-ignored' );
                                }
                                $result->merge( $status );
                        }
                }

                $logContext = [
                        'requestingIp' => $ip,
                        'requestingUser' => $performingUser->getName(),
                        'targetUsername' => $username,
                        'targetEmail' => $email,
                        'actualUser' => $firstUser->getName(),
                ];

                if ( !$result->isGood() ) {
                        $this->logger->info(
                                "{requestingUser} attempted password reset of {actualUser} but failed",
                                $logContext + [ 'errors' => $result->getErrors() ]
                        );
                        return $result;
                }

                $passwords = [];
                foreach ( $reqs as $req ) {
                        $this->authManager->changeAuthenticationData( $req );
                }

                $this->logger->info(
                        "{requestingUser} did password reset of {actualUser}",
                        $logContext
                );

                return StatusValue::newGood( $passwords );
        }

        /**
         * @param string $email
         * @return User[]
         * @throws MWException On unexpected database errors
         */
        protected function getUsersByEmail( $email ) {
                $res = wfGetDB( DB_REPLICA )->select(
                        'user',
                        User::selectFields(),
                        [ 'user_email' => $email ],
                        __METHOD__
                );

                if ( !$res ) {
                        // Some sort of database error, probably unreachable
                        throw new MWException( 'Unknown database error in ' . __METHOD__ );
                }

                $users = [];
                foreach ( $res as $row ) {
                        $users[] = User::newFromRow( $row );
                }
                return $users;
        }
}