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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\SecurePoll\User; |
| 4 | |
| 5 | use MediaWiki\Context\RequestContext; |
| 6 | use MediaWiki\Extension\SecurePoll\Entities\Election; |
| 7 | use MediaWiki\MediaWikiServices; |
| 8 | use MediaWiki\Status\Status; |
| 9 | |
| 10 | /** |
| 11 | * Class for guest login from one MW instance running SecurePoll to another. |
| 12 | */ |
| 13 | class RemoteMWAuth extends Auth { |
| 14 | /** @inheritDoc */ |
| 15 | public static function getCreateDescriptors() { |
| 16 | return [ |
| 17 | 'script-path' => [ |
| 18 | 'label-message' => 'securepoll-create-label-remote_mw_script_path', |
| 19 | 'type' => 'url', |
| 20 | 'required' => true, |
| 21 | 'SecurePoll_type' => 'property', |
| 22 | ], |
| 23 | ]; |
| 24 | } |
| 25 | |
| 26 | /** |
| 27 | * Create a voter on a direct request from a remote site. |
| 28 | * @param Election $election |
| 29 | * @return Status |
| 30 | */ |
| 31 | public function requestLogin( $election ) { |
| 32 | // This is a global exception we may want to let it pass. |
| 33 | // Even though $wgConf is an instance of MediaWiki\Config\SiteConfiguration, |
| 34 | // it’s not exposed as a service, so accessing it via |
| 35 | // `MediaWikiServices::getInstance()->getService( 'SiteConfiguration' )` is |
| 36 | // not possible. |
| 37 | global $wgConf; |
| 38 | $request = RequestContext::getMain()->getRequest(); |
| 39 | |
| 40 | $urlParamNames = [ |
| 41 | 'id', |
| 42 | 'token', |
| 43 | 'wiki', |
| 44 | 'site', |
| 45 | 'lang', |
| 46 | 'domain' |
| 47 | ]; |
| 48 | $vars = []; |
| 49 | $params = []; |
| 50 | foreach ( $urlParamNames as $name ) { |
| 51 | $value = $request->getVal( $name ); |
| 52 | if ( !preg_match( '/^[\w.-]*$/', (string)$value ) ) { |
| 53 | wfDebug( __METHOD__ . " Invalid parameter: $name" ); |
| 54 | return Status::newFatal( 'securepoll-remote-auth-error' ); |
| 55 | } |
| 56 | $params[$name] = $value; |
| 57 | $vars["\$$name"] = $value; |
| 58 | } |
| 59 | |
| 60 | $wgConf->loadFullData(); |
| 61 | |
| 62 | // Get the site and language from $wgConf, if necessary. |
| 63 | if ( !isset( $params['site'] ) || !isset( $params['lang'] ) ) { |
| 64 | // @phan-suppress-next-line PhanTypeMismatchArgumentNullable |
| 65 | [ $site, $lang ] = $wgConf->siteFromDB( $params['wiki'] ); |
| 66 | if ( !isset( $params['site'] ) ) { |
| 67 | $params['site'] = $site; |
| 68 | $vars['$site'] = $site; |
| 69 | } |
| 70 | if ( !isset( $params['lang'] ) ) { |
| 71 | $params['lang'] = $lang; |
| 72 | $vars['$lang'] = $lang; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | // In some cases it doesn't matter what we pass for $suffix. When it |
| 77 | // does, the correct value is $params['site'] unless there is a string |
| 78 | // back-mapping for it in $wgConf->suffixes. |
| 79 | $suffixes = array_flip( $wgConf->suffixes ); |
| 80 | $suffix = isset( $suffixes[$params['site']] ) && is_string( |
| 81 | $suffixes[$params['site']] |
| 82 | ) ? $suffixes[$params['site']] : $params['site']; |
| 83 | |
| 84 | $server = $wgConf->get( 'wgServer', $params['wiki'], $suffix, $params ); |
| 85 | $params['wgServer'] = $server; |
| 86 | $vars["\$wgServer"] = $server; |
| 87 | |
| 88 | $url = $election->getProperty( 'remote-mw-script-path' ); |
| 89 | $url = strtr( $url, $vars ); |
| 90 | if ( substr( $url, -1 ) != '/' ) { |
| 91 | $url .= '/'; |
| 92 | } |
| 93 | $url .= 'api.php'; |
| 94 | |
| 95 | $options = [ |
| 96 | // Use the default SSL certificate file |
| 97 | // Necessary on some versions of cURL, others do this by default |
| 98 | CURLOPT_CAINFO => '/etc/ssl/certs/ca-certificates.crt', |
| 99 | 'timeout' => 20, |
| 100 | 'postData' => [ |
| 101 | 'action' => 'securepollauth', |
| 102 | 'id' => $params['id'], |
| 103 | 'format' => 'json', |
| 104 | 'token' => $params['token'], |
| 105 | ], |
| 106 | ]; |
| 107 | |
| 108 | $response = MediaWikiServices::getInstance()->getHttpRequestFactory() |
| 109 | ->post( $url, $options, __METHOD__ ); |
| 110 | |
| 111 | if ( !$response ) { |
| 112 | return Status::newFatal( 'securepoll-remote-auth-error' ); |
| 113 | } |
| 114 | |
| 115 | /** @var array|null $json */ |
| 116 | $json = json_decode( $response, true ); |
| 117 | if ( $json === null ) { |
| 118 | return Status::newFatal( 'securepoll-remote-parse-error' ); |
| 119 | } |
| 120 | |
| 121 | if ( isset( $json['error'] ) ) { |
| 122 | return Status::newFatal( $json['error']['code'] ); |
| 123 | } |
| 124 | |
| 125 | $params = $json['securepollauth']; |
| 126 | $params['type'] = 'remote-mw'; |
| 127 | $params['electionId'] = $election->getId(); |
| 128 | |
| 129 | $qualStatus = $election->getQualifiedStatus( $params ); |
| 130 | if ( !$qualStatus->isOK() ) { |
| 131 | return $qualStatus; |
| 132 | } |
| 133 | |
| 134 | return Status::newGood( $this->getVoter( $params ) ); |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Apply a one-way hash function to a string. |
| 139 | * |
| 140 | * The aim is to encode a user's login token so that it can be transmitted to the |
| 141 | * voting server without giving the voting server any special rights on the wiki |
| 142 | * (apart from the ability to verify the user). We truncate the hash at 26 |
| 143 | * hexadecimal digits, to provide 24 bits less information than original token. |
| 144 | * This makes discovery of the token difficult even if the hash function is |
| 145 | * completely broken. |
| 146 | * @param string $token |
| 147 | * @return string |
| 148 | */ |
| 149 | public static function encodeToken( $token ) { |
| 150 | return substr( sha1( __CLASS__ . '-' . $token ), 0, 26 ); |
| 151 | } |
| 152 | } |