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| 1 | <?php |
| 2 | namespace Ably; |
| 3 | |
| 4 | use Ably\AblyRest; |
| 5 | use Ably\Log; |
| 6 | use Ably\Models\AuthOptions; |
| 7 | use Ably\Models\ClientOptions; |
| 8 | use Ably\Models\TokenDetails; |
| 9 | use Ably\Models\TokenParams; |
| 10 | use Ably\Models\TokenRequest; |
| 11 | use Ably\Exceptions\AblyException; |
| 12 | |
| 13 | /** |
| 14 | * Provides authentification methods for AblyRest instances |
| 15 | * @property-read string|null $clientId ClientId currently in use. Null if not authenticated yet or when using anonymous auth. |
| 16 | */ |
| 17 | class Auth { |
| 18 | protected $defaultAuthOptions; |
| 19 | protected $defaultTokenParams; |
| 20 | protected $defaultAuthorizeAuthOptions = []; |
| 21 | protected $defaultAuthorizeTokenParams = []; |
| 22 | protected $basicAuth; |
| 23 | protected $tokenDetails; |
| 24 | protected $ably; |
| 25 | const TOKEN_EXPIRY_MARGIN = 15000; // a token is considered expired a bit earlier to prevent race conditions |
| 26 | |
| 27 | public function __construct( AblyRest $ably, ClientOptions $options ) { |
| 28 | $this->defaultAuthOptions = new AuthOptions($options); |
| 29 | $this->defaultTokenParams = $options->defaultTokenParams; |
| 30 | $this->ably = $ably; |
| 31 | |
| 32 | if ( empty( $this->defaultAuthOptions->useTokenAuth ) && $this->defaultAuthOptions->key && empty( $this->defaultAuthOptions->clientId ) ) { |
| 33 | $this->basicAuth = true; |
| 34 | Log::d( 'Auth: anonymous, using basic auth' ); |
| 35 | |
| 36 | if ( !$options->tls ) { |
| 37 | log::e( 'Auth: trying to use basic key auth over insecure connection' ); |
| 38 | throw new AblyException ( 'Trying to use basic key auth over insecure connection', 40103, 401 ); |
| 39 | } |
| 40 | return; |
| 41 | } |
| 42 | |
| 43 | $this->basicAuth = false; |
| 44 | |
| 45 | if(!empty( $this->defaultAuthOptions->authCallback )) { |
| 46 | Log::d( 'Auth: using token auth with authCallback' ); |
| 47 | } else if(!empty( $this->defaultAuthOptions->authUrl )) { |
| 48 | Log::d( 'Auth: using token auth with authUrl' ); |
| 49 | } else if(!empty( $this->defaultAuthOptions->key )) { |
| 50 | Log::d( 'Auth: using token auth with client-side signing' ); |
| 51 | } else if(!empty( $this->defaultAuthOptions->tokenDetails )) { |
| 52 | Log::d( 'Auth: using token auth with supplied token only' ); |
| 53 | } else { |
| 54 | Log::e( 'Auth: no authentication parameters supplied' ); |
| 55 | throw new AblyException ( 'No authentication parameters supplied', 40103, 401 ); |
| 56 | } |
| 57 | |
| 58 | $this->tokenDetails = $this->defaultAuthOptions->tokenDetails; |
| 59 | |
| 60 | if ( $this->defaultAuthOptions->clientId == '*' ) { |
| 61 | throw new AblyException ( 'Instantiating AblyRest with a wildcard clientId (`*`) not allowed.', 40003, 400 ); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Magic getter for the $clientId property |
| 67 | */ |
| 68 | public function __get( $name ) { |
| 69 | if ($name == 'clientId') { |
| 70 | if ( empty( $this->tokenDetails ) ) { |
| 71 | if ( !empty( $this->defaultAuthOptions->clientId ) ) { |
| 72 | return $this->defaultAuthOptions->clientId; |
| 73 | } |
| 74 | } else { |
| 75 | return $this->tokenDetails->clientId; |
| 76 | } |
| 77 | |
| 78 | return null; |
| 79 | } |
| 80 | |
| 81 | throw new AblyException( 'Undefined property: '.__CLASS__.'::'.$name ); |
| 82 | } |
| 83 | |
| 84 | public function isUsingBasicAuth() { |
| 85 | return $this->basicAuth; |
| 86 | } |
| 87 | |
| 88 | |
| 89 | public function authorizeInternal( $tokenParams = [], $authOptions = [], $force = true ) { |
| 90 | |
| 91 | if ( !empty( $tokenParams ) ) { |
| 92 | $tokenParamsCopy = $tokenParams; |
| 93 | if ( isset( $tokenParamsCopy['timestamp'] ) ) unset( $tokenParamsCopy['timestamp'] ); |
| 94 | |
| 95 | $this->defaultAuthorizeTokenParams = array_merge( $this->defaultAuthorizeTokenParams, $tokenParamsCopy ); |
| 96 | } |
| 97 | if ( !empty( $authOptions ) ) { |
| 98 | $authOptionsCopy = $authOptions; |
| 99 | |
| 100 | $this->defaultAuthorizeAuthOptions = array_merge( $this->defaultAuthorizeAuthOptions, $authOptionsCopy ); |
| 101 | } |
| 102 | |
| 103 | if ( !$force && !empty( $this->tokenDetails ) ) { |
| 104 | if ( empty( $this->tokenDetails->expires ) ) { |
| 105 | // using cached token |
| 106 | Log::d( 'Auth::authorize: using cached token, unknown expiration time' ); |
| 107 | return $this->tokenDetails; |
| 108 | } else if ( $this->tokenDetails->expires - self::TOKEN_EXPIRY_MARGIN > $this->ably->systemTime() ) { |
| 109 | // using cached token |
| 110 | Log::d( 'Auth::authorize: using cached token, expires on ' . date( 'Y-m-d H:i:s', $this->tokenDetails->expires / 1000 ) ); |
| 111 | return $this->tokenDetails; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | $tokenParamsWithDefaults = array_merge( $this->defaultAuthorizeTokenParams, $tokenParams ); |
| 116 | $authOptionsWithDefaults = array_merge( $this->defaultAuthorizeAuthOptions, $authOptions ); |
| 117 | |
| 118 | Log::d( 'Auth::authorize: requesting new token' ); |
| 119 | $this->tokenDetails = $this->requestToken( $tokenParamsWithDefaults, $authOptionsWithDefaults ); |
| 120 | $this->basicAuth = false; |
| 121 | |
| 122 | return $this->tokenDetails; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Ensures that a valid token is present for the library instance. This will always request a new token. |
| 127 | * In the event that a new token request is made, the specified options are used. |
| 128 | * If not already using token based auth, this will enable it. |
| 129 | * Stores the AuthOptions and TokenParams arguments as defaults for subsequent authorisations. |
| 130 | * @param array|null $tokenParams Requested token parameters |
| 131 | * @param array|null $authOptions Overridable auth options, if you don't wish to use the default ones |
| 132 | * @return \Ably\Models\TokenDetails The new token |
| 133 | */ |
| 134 | public function authorize( $tokenParams = [], $authOptions = [] ) { |
| 135 | return $this->authorizeInternal( $tokenParams, $authOptions ); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * @deprecated 1.0 Please use `authorize` instead |
| 140 | */ |
| 141 | public function authorise( $tokenParams = [], $authOptions = [] ) { |
| 142 | Log::w( 'Auth::authorise is deprecated, please use Auth::authorize instead'); |
| 143 | |
| 144 | return $this->authorizeInternal( $tokenParams, $authOptions ); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Get HTTP headers with authentication data |
| 149 | * Automatically attempts to authorize token requests |
| 150 | * @return Array Array of HTTP headers containing an `Authorization` header |
| 151 | */ |
| 152 | public function getAuthHeaders() { |
| 153 | $headers = []; |
| 154 | if ( $this->isUsingBasicAuth() ) { |
| 155 | $headers[] = 'Authorization: Basic ' . base64_encode( $this->defaultAuthOptions->key ); |
| 156 | } else { |
| 157 | $this->authorizeInternal( [], [], $force = false ); // authorize only if necessary |
| 158 | $headers[] = 'Authorization: Bearer '. base64_encode( $this->tokenDetails->token ); |
| 159 | } |
| 160 | |
| 161 | return $headers; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * @return \Ably\Models\TokenDetails Token currently in use |
| 166 | */ |
| 167 | public function getTokenDetails() { |
| 168 | return $this->tokenDetails; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Request a new token. |
| 173 | * @param array|null $tokenParams Requested token parameters |
| 174 | * @param array|null $authOptions Overridable auth options, if you don't wish to use the default ones |
| 175 | * @param \Ably\Models\ClientOptions|array $options |
| 176 | * @throws \Ably\Exceptions\AblyException |
| 177 | * @return \Ably\Models\TokenDetails The new token |
| 178 | */ |
| 179 | public function requestToken( $tokenParams = [], $authOptions = [] ) { |
| 180 | // token clientId priority: |
| 181 | // $tokenParams->clientId overrides $authOptions->tokenId overrides $this->defaultAuthOptions->clientId overrides $this->defaultTokenParams->clientId |
| 182 | $tokenClientId = $this->defaultTokenParams->clientId; |
| 183 | if ( !empty( $this->defaultAuthOptions->clientId ) ) $tokenClientId = $this->defaultAuthOptions->clientId; |
| 184 | // provided authOptions may override clientId, even with a null value |
| 185 | if ( array_key_exists( 'clientId', $authOptions ) ) $tokenClientId = $authOptions['clientId']; |
| 186 | // provided tokenParams may override clientId, even with a null value |
| 187 | if ( array_key_exists( 'clientId', $tokenParams ) ) $tokenClientId = $tokenParams['clientId']; |
| 188 | |
| 189 | // merge provided auth options with defaults |
| 190 | $authOptionsMerged = new AuthOptions( array_merge( $this->defaultAuthOptions->toArray(), $authOptions ) ); |
| 191 | $tokenParamsMerged = new TokenParams( array_merge( $this->defaultTokenParams->toArray(), $tokenParams ) ); |
| 192 | |
| 193 | $tokenParamsMerged->clientId = $tokenClientId; |
| 194 | |
| 195 | // get a signed token request |
| 196 | $signedTokenRequest = null; |
| 197 | if ( !empty( $authOptionsMerged->authCallback ) ) { |
| 198 | Log::d( 'Auth::requestToken:', 'using token auth with auth_callback' ); |
| 199 | |
| 200 | $callback = $authOptionsMerged->authCallback; |
| 201 | $data = $callback($tokenParamsMerged); |
| 202 | |
| 203 | // returned data can be either a signed TokenRequest or TokenDetails or just a token string |
| 204 | if ( is_a( $data, '\Ably\Models\TokenRequest' ) ) { |
| 205 | $signedTokenRequest = $data; |
| 206 | } else if ( is_a( $data, '\Ably\Models\TokenDetails' ) ) { |
| 207 | return $data; |
| 208 | } else if ( is_string( $data ) ) { |
| 209 | return new TokenDetails( $data ); |
| 210 | } else { |
| 211 | Log::e( 'Auth::requestToken:', 'Invalid response from authCallback, expecting signed TokenRequest or TokenDetails or a token string' ); |
| 212 | throw new AblyException( 'Invalid response from authCallback' ); |
| 213 | } |
| 214 | } elseif ( !empty( $authOptionsMerged->authUrl ) ) { |
| 215 | Log::d( 'Auth::requestToken:', 'using token auth with auth_url' ); |
| 216 | |
| 217 | $data = $this->ably->http->request( |
| 218 | $authOptionsMerged->authMethod, |
| 219 | $authOptionsMerged->authUrl, |
| 220 | $authOptionsMerged->authHeaders ? : [], |
| 221 | array_merge( $authOptionsMerged->authParams ? : [], $tokenParamsMerged->toArray() ) |
| 222 | ); |
| 223 | |
| 224 | $data = $data['body']; |
| 225 | |
| 226 | if ( is_string( $data ) ) { |
| 227 | return new TokenDetails( $data ); // assuming it's a token string |
| 228 | } else if ( is_object( $data ) ) { |
| 229 | if ( !empty( $data->issued ) ) { // assuming it's a token |
| 230 | return new TokenDetails( $data ); |
| 231 | } else if ( !empty( $data->mac ) ) { // assuming it's a signed token request |
| 232 | $signedTokenRequest = new TokenRequest( $data ); |
| 233 | } else { |
| 234 | Log::e( 'Auth::requestToken:', 'Invalid response from authURL, expecting JSON representation of signed TokenRequest or TokenDetails' ); |
| 235 | throw new AblyException( 'Invalid response from authURL' ); |
| 236 | } |
| 237 | } else { |
| 238 | Log::e( 'Auth::requestToken:', 'Invalid response from authURL, expecting token string or JSON representation of signed TokenRequest or TokenDetails' ); |
| 239 | throw new AblyException( 'Invalid response from authURL' ); |
| 240 | } |
| 241 | } elseif ( !empty( $authOptionsMerged->key ) ) { |
| 242 | Log::d( 'Auth::requestToken:', 'using token auth with client-side signing' ); |
| 243 | $signedTokenRequest = $this->createTokenRequest( $tokenParams, $authOptions ); |
| 244 | } else { |
| 245 | Log::e( 'Auth::requestToken:', 'Unable to request a Token, auth options don\'t provide means to do so' ); |
| 246 | throw new AblyException( 'Unable to request a Token, auth options don\'t provide means to do so', 40101, 401 ); |
| 247 | } |
| 248 | |
| 249 | // do the request |
| 250 | |
| 251 | $keyName = $signedTokenRequest->keyName; |
| 252 | |
| 253 | if ( empty( $keyName ) ) { |
| 254 | throw new AblyException( 'No keyName specified in the TokenRequest' ); |
| 255 | } |
| 256 | |
| 257 | $res = $this->ably->post( |
| 258 | "/keys/{$keyName}/requestToken", |
| 259 | $headers = [], |
| 260 | $params = json_encode( $signedTokenRequest->toArray() ), |
| 261 | $returnHeaders = false, |
| 262 | $authHeaders = false |
| 263 | ); |
| 264 | |
| 265 | if ( empty( $res->token ) ) { // just in case.. an AblyRequestException should be thrown on the previous step with a 4XX error code on failure |
| 266 | throw new AblyException( 'Failed to get a token', 40100, 401 ); |
| 267 | } |
| 268 | |
| 269 | return new TokenDetails( $res ); |
| 270 | } |
| 271 | |
| 272 | /** |
| 273 | * Create a signed token request based on known credentials |
| 274 | * and the given token params. This would typically be used if creating |
| 275 | * signed requests for submission by another client. |
| 276 | * @param \Ably\Models\TokenParams $tokenParams |
| 277 | * @param \Ably\Models\AuthOptions $authOptions |
| 278 | * @return \Ably\Models\TokenRequest A signed token request |
| 279 | */ |
| 280 | public function createTokenRequest( $tokenParams = [], $authOptions = [] ) { |
| 281 | $tokenClientId = $this->defaultTokenParams->clientId; |
| 282 | if ( !empty( $this->defaultAuthOptions->clientId ) ) $tokenClientId = $this->defaultAuthOptions->clientId; |
| 283 | if ( array_key_exists( 'clientId', $authOptions ) ) $tokenClientId = $authOptions['clientId']; |
| 284 | if ( array_key_exists( 'clientId', $tokenParams ) ) $tokenClientId = $tokenParams['clientId']; |
| 285 | |
| 286 | $authOptions = new AuthOptions( array_merge( $this->defaultAuthOptions->toArray(), $authOptions ) ); |
| 287 | $tokenParams = new TokenParams( array_merge( $this->defaultTokenParams->toArray(), $tokenParams ) ); |
| 288 | $tokenParams->clientId = $tokenClientId; |
| 289 | |
| 290 | $keyParts = explode( ':', $authOptions->key ); |
| 291 | |
| 292 | if ( count( $keyParts ) != 2 ) { |
| 293 | Log::e( 'Auth::createTokenRequest', "Can't create signed token request, invalid key specified" ); |
| 294 | throw new AblyException( 'Invalid key specified', 40101, 401 ); |
| 295 | } |
| 296 | |
| 297 | $keyName = $keyParts[0]; |
| 298 | $keySecret = $keyParts[1]; |
| 299 | |
| 300 | $tokenRequest = new TokenRequest( $tokenParams ); |
| 301 | |
| 302 | if ( !empty( $tokenRequest->keyName ) && $tokenRequest->keyName != $keyName ) { |
| 303 | throw new AblyException( 'Incompatible keys specified', 40102, 401 ); |
| 304 | } else { |
| 305 | $tokenRequest->keyName = $keyName; |
| 306 | } |
| 307 | |
| 308 | if ( $authOptions->queryTime ) { |
| 309 | $tokenRequest->timestamp = sprintf ( "%.0f", $this->ably->time() ); |
| 310 | } else if ( empty( $tokenRequest->timestamp ) ) { |
| 311 | $tokenRequest->timestamp = sprintf ( "%.0f", $this->ably->systemTime() ); |
| 312 | } |
| 313 | // note: sprintf converts floating point numbers to plain integers (without scientific notation) |
| 314 | // regardless of the "precision" php.ini setting |
| 315 | |
| 316 | if ( empty( $tokenRequest->clientId ) ) { |
| 317 | $tokenRequest->clientId = $authOptions->clientId; |
| 318 | } |
| 319 | |
| 320 | if ( empty( $tokenRequest->nonce ) ) { |
| 321 | $tokenRequest->nonce = md5( microtime( true ) . mt_rand() ); |
| 322 | } |
| 323 | |
| 324 | $signText = implode( "\n", [ |
| 325 | empty( $tokenRequest->keyName ) ? '' : $tokenRequest->keyName, |
| 326 | empty( $tokenRequest->ttl ) ? '' : $tokenRequest->ttl, |
| 327 | empty( $tokenRequest->capability ) ? '' : $tokenRequest->capability, |
| 328 | empty( $tokenRequest->clientId ) ? '' : $tokenRequest->clientId, |
| 329 | empty( $tokenRequest->timestamp ) ? '' : $tokenRequest->timestamp, |
| 330 | empty( $tokenRequest->nonce ) ? '' : $tokenRequest->nonce, |
| 331 | ] ) . "\n"; |
| 332 | |
| 333 | |
| 334 | if ( empty( $tokenRequest->mac ) ) { |
| 335 | $tokenRequest->mac = base64_encode( hash_hmac( 'sha256', $signText, $keySecret, true ) ); |
| 336 | } |
| 337 | |
| 338 | return $tokenRequest; |
| 339 | } |
| 340 | } |