XOOPS /
XoopsCore25
| Total Complexity | 88 |
| Total Lines | 584 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
Complex classes like JWT often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use JWT, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 26 | class JWT |
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| 27 | { |
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| 28 | const ASN1_INTEGER = 0x02; |
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| 29 | const ASN1_SEQUENCE = 0x10; |
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| 30 | const ASN1_BIT_STRING = 0x03; |
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| 31 | |||
| 32 | /** |
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| 33 | * When checking nbf, iat or expiration times, |
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| 34 | * we want to provide some extra leeway time to |
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| 35 | * account for clock skew. |
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| 36 | */ |
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| 37 | public static $leeway = 0; |
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| 38 | |||
| 39 | /** |
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| 40 | * Allow the current timestamp to be specified. |
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| 41 | * Useful for fixing a value within unit testing. |
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| 42 | * |
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| 43 | * Will default to PHP time() value if null. |
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| 44 | */ |
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| 45 | public static $timestamp = null; |
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| 46 | |||
| 47 | public static $supported_algs = array( |
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| 48 | 'ES384' => array('openssl', 'SHA384'), |
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| 49 | 'ES256' => array('openssl', 'SHA256'), |
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| 50 | 'HS256' => array('hash_hmac', 'SHA256'), |
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| 51 | 'HS384' => array('hash_hmac', 'SHA384'), |
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| 52 | 'HS512' => array('hash_hmac', 'SHA512'), |
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| 53 | 'RS256' => array('openssl', 'SHA256'), |
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| 54 | 'RS384' => array('openssl', 'SHA384'), |
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| 55 | 'RS512' => array('openssl', 'SHA512'), |
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| 56 | 'EdDSA' => array('sodium_crypto', 'EdDSA'), |
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| 57 | ); |
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| 58 | |||
| 59 | /** |
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| 60 | * Decodes a JWT string into a PHP object. |
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| 61 | * |
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| 62 | * @param string $jwt The JWT |
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| 63 | * @param Key|array<Key>|mixed $keyOrKeyArray The Key or array of Key objects. |
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|
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| 64 | * If the algorithm used is asymmetric, this is the public key |
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| 65 | * Each Key object contains an algorithm and matching key. |
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| 66 | * Supported algorithms are 'ES384','ES256', 'HS256', 'HS384', |
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| 67 | * 'HS512', 'RS256', 'RS384', and 'RS512' |
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| 68 | * @param array $allowed_algs [DEPRECATED] List of supported verification algorithms. Only |
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| 69 | * should be used for backwards compatibility. |
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| 70 | * |
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| 71 | * @return object The JWT's payload as a PHP object |
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| 72 | * |
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| 73 | * @throws InvalidArgumentException Provided JWT was empty |
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| 74 | * @throws UnexpectedValueException Provided JWT was invalid |
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| 75 | * @throws SignatureInvalidException Provided JWT was invalid because the signature verification failed |
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| 76 | * @throws BeforeValidException Provided JWT is trying to be used before it's eligible as defined by 'nbf' |
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| 77 | * @throws BeforeValidException Provided JWT is trying to be used before it's been created as defined by 'iat' |
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| 78 | * @throws ExpiredException Provided JWT has since expired, as defined by the 'exp' claim |
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| 79 | * |
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| 80 | * @uses jsonDecode |
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| 81 | * @uses urlsafeB64Decode |
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| 82 | */ |
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| 83 | public static function decode($jwt, $keyOrKeyArray, array $allowed_algs = array()) |
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| 84 | { |
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| 85 | $timestamp = \is_null(static::$timestamp) ? \time() : static::$timestamp; |
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| 86 | |||
| 87 | if (empty($keyOrKeyArray)) { |
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| 88 | throw new InvalidArgumentException('Key may not be empty'); |
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| 89 | } |
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| 90 | $tks = \explode('.', $jwt); |
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| 91 | if (\count($tks) != 3) { |
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| 92 | throw new UnexpectedValueException('Wrong number of segments'); |
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| 93 | } |
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| 94 | list($headb64, $bodyb64, $cryptob64) = $tks; |
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| 95 | if (null === ($header = static::jsonDecode(static::urlsafeB64Decode($headb64)))) { |
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| 96 | throw new UnexpectedValueException('Invalid header encoding'); |
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| 97 | } |
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| 98 | if (null === $payload = static::jsonDecode(static::urlsafeB64Decode($bodyb64))) { |
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| 99 | throw new UnexpectedValueException('Invalid claims encoding'); |
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| 100 | } |
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| 101 | if (false === ($sig = static::urlsafeB64Decode($cryptob64))) { |
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| 102 | throw new UnexpectedValueException('Invalid signature encoding'); |
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| 103 | } |
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| 104 | if (empty($header->alg)) { |
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| 105 | throw new UnexpectedValueException('Empty algorithm'); |
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| 106 | } |
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| 107 | if (empty(static::$supported_algs[$header->alg])) { |
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| 108 | throw new UnexpectedValueException('Algorithm not supported'); |
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| 109 | } |
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| 110 | |||
| 111 | list($keyMaterial, $algorithm) = self::getKeyMaterialAndAlgorithm( |
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| 112 | $keyOrKeyArray, |
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| 113 | empty($header->kid) ? null : $header->kid |
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| 114 | ); |
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| 115 | |||
| 116 | if (empty($algorithm)) { |
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| 117 | // Use deprecated "allowed_algs" to determine if the algorithm is supported. |
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| 118 | // This opens up the possibility of an attack in some implementations. |
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| 119 | // @see https://github.com/firebase/php-jwt/issues/351 |
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| 120 | if (!\in_array($header->alg, $allowed_algs)) { |
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| 121 | throw new UnexpectedValueException('Algorithm not allowed'); |
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| 122 | } |
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| 123 | } else { |
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| 124 | // Check the algorithm |
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| 125 | if (!self::constantTimeEquals($algorithm, $header->alg)) { |
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| 126 | // See issue #351 |
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| 127 | throw new UnexpectedValueException('Incorrect key for this algorithm'); |
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| 128 | } |
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| 129 | } |
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| 130 | if ($header->alg === 'ES256' || $header->alg === 'ES384') { |
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| 131 | // OpenSSL expects an ASN.1 DER sequence for ES256/ES384 signatures |
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| 132 | $sig = self::signatureToDER($sig); |
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| 133 | } |
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| 134 | |||
| 135 | if (!static::verify("$headb64.$bodyb64", $sig, $keyMaterial, $header->alg)) { |
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| 136 | throw new SignatureInvalidException('Signature verification failed'); |
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| 137 | } |
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| 138 | |||
| 139 | // Check the nbf if it is defined. This is the time that the |
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| 140 | // token can actually be used. If it's not yet that time, abort. |
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| 141 | if (isset($payload->nbf) && $payload->nbf > ($timestamp + static::$leeway)) { |
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| 142 | throw new BeforeValidException( |
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| 143 | 'Cannot handle token prior to ' . \date(DateTime::ISO8601, $payload->nbf) |
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| 144 | ); |
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| 145 | } |
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| 146 | |||
| 147 | // Check that this token has been created before 'now'. This prevents |
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| 148 | // using tokens that have been created for later use (and haven't |
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| 149 | // correctly used the nbf claim). |
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| 150 | if (isset($payload->iat) && $payload->iat > ($timestamp + static::$leeway)) { |
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| 151 | throw new BeforeValidException( |
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| 152 | 'Cannot handle token prior to ' . \date(DateTime::ISO8601, $payload->iat) |
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| 153 | ); |
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| 154 | } |
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| 155 | |||
| 156 | // Check if this token has expired. |
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| 157 | if (isset($payload->exp) && ($timestamp - static::$leeway) >= $payload->exp) { |
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| 158 | throw new ExpiredException('Expired token'); |
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| 159 | } |
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| 160 | |||
| 161 | return $payload; |
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| 162 | } |
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| 163 | |||
| 164 | /** |
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| 165 | * Converts and signs a PHP object or array into a JWT string. |
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| 166 | * |
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| 167 | * @param object|array $payload PHP object or array |
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| 168 | * @param string|resource $key The secret key. |
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| 169 | * If the algorithm used is asymmetric, this is the private key |
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| 170 | * @param string $alg The signing algorithm. |
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| 171 | * Supported algorithms are 'ES384','ES256', 'HS256', 'HS384', |
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| 172 | * 'HS512', 'RS256', 'RS384', and 'RS512' |
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| 173 | * @param mixed $keyId |
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| 174 | * @param array $head An array with header elements to attach |
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| 175 | * |
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| 176 | * @return string A signed JWT |
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| 177 | * |
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| 178 | * @uses jsonEncode |
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| 179 | * @uses urlsafeB64Encode |
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| 180 | */ |
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| 181 | public static function encode($payload, $key, $alg = 'HS256', $keyId = null, $head = null) |
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| 182 | { |
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| 183 | $header = array('typ' => 'JWT', 'alg' => $alg); |
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| 184 | if ($keyId !== null) { |
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| 185 | $header['kid'] = $keyId; |
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| 186 | } |
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| 187 | if (isset($head) && \is_array($head)) { |
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| 188 | $header = \array_merge($head, $header); |
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| 189 | } |
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| 190 | $segments = array(); |
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| 191 | $segments[] = static::urlsafeB64Encode(static::jsonEncode($header)); |
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| 192 | $segments[] = static::urlsafeB64Encode(static::jsonEncode($payload)); |
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| 193 | $signing_input = \implode('.', $segments); |
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| 194 | |||
| 195 | $signature = static::sign($signing_input, $key, $alg); |
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| 196 | $segments[] = static::urlsafeB64Encode($signature); |
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| 197 | |||
| 198 | return \implode('.', $segments); |
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| 199 | } |
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| 200 | |||
| 201 | /** |
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| 202 | * Sign a string with a given key and algorithm. |
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| 203 | * |
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| 204 | * @param string $msg The message to sign |
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| 205 | * @param string|resource $key The secret key |
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| 206 | * @param string $alg The signing algorithm. |
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| 207 | * Supported algorithms are 'ES384','ES256', 'HS256', 'HS384', |
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| 208 | * 'HS512', 'RS256', 'RS384', and 'RS512' |
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| 209 | * |
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| 210 | * @return string An encrypted message |
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| 211 | * |
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| 212 | * @throws DomainException Unsupported algorithm or bad key was specified |
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| 213 | */ |
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| 214 | public static function sign($msg, $key, $alg = 'HS256') |
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| 215 | { |
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| 216 | if (empty(static::$supported_algs[$alg])) { |
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| 217 | throw new DomainException('Algorithm not supported'); |
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| 218 | } |
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| 219 | list($function, $algorithm) = static::$supported_algs[$alg]; |
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| 220 | switch ($function) { |
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| 221 | case 'hash_hmac': |
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| 222 | return \hash_hmac($algorithm, $msg, $key, true); |
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| 223 | case 'openssl': |
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| 224 | $signature = ''; |
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| 225 | $success = \openssl_sign($msg, $signature, $key, $algorithm); |
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| 226 | if (!$success) { |
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| 227 | throw new DomainException("OpenSSL unable to sign data"); |
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| 228 | } |
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| 229 | if ($alg === 'ES256') { |
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| 230 | $signature = self::signatureFromDER($signature, 256); |
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| 231 | } elseif ($alg === 'ES384') { |
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| 232 | $signature = self::signatureFromDER($signature, 384); |
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| 233 | } |
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| 234 | return $signature; |
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| 235 | case 'sodium_crypto': |
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| 236 | if (!function_exists('sodium_crypto_sign_detached')) { |
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| 237 | throw new DomainException('libsodium is not available'); |
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| 238 | } |
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| 239 | try { |
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| 240 | // The last non-empty line is used as the key. |
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| 241 | $lines = array_filter(explode("\n", $key)); |
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| 242 | $key = base64_decode(end($lines)); |
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| 243 | return sodium_crypto_sign_detached($msg, $key); |
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| 244 | } catch (Exception $e) { |
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| 245 | throw new DomainException($e->getMessage(), 0, $e); |
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| 246 | } |
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| 247 | } |
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| 248 | } |
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| 249 | |||
| 250 | /** |
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| 251 | * Verify a signature with the message, key and method. Not all methods |
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| 252 | * are symmetric, so we must have a separate verify and sign method. |
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| 253 | * |
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| 254 | * @param string $msg The original message (header and body) |
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| 255 | * @param string $signature The original signature |
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| 256 | * @param string|resource $key For HS*, a string key works. for RS*, must be a resource of an openssl public key |
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| 257 | * @param string $alg The algorithm |
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| 258 | * |
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| 259 | * @return bool |
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| 260 | * |
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| 261 | * @throws DomainException Invalid Algorithm, bad key, or OpenSSL failure |
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| 262 | */ |
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| 263 | private static function verify($msg, $signature, $key, $alg) |
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| 264 | { |
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| 265 | if (empty(static::$supported_algs[$alg])) { |
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| 266 | throw new DomainException('Algorithm not supported'); |
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| 267 | } |
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| 268 | |||
| 269 | list($function, $algorithm) = static::$supported_algs[$alg]; |
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| 270 | switch ($function) { |
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| 271 | case 'openssl': |
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| 272 | $success = \openssl_verify($msg, $signature, $key, $algorithm); |
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| 273 | if ($success === 1) { |
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| 274 | return true; |
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| 275 | } elseif ($success === 0) { |
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| 276 | return false; |
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| 277 | } |
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| 278 | // returns 1 on success, 0 on failure, -1 on error. |
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| 279 | throw new DomainException( |
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| 280 | 'OpenSSL error: ' . \openssl_error_string() |
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| 281 | ); |
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| 282 | case 'sodium_crypto': |
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| 283 | if (!function_exists('sodium_crypto_sign_verify_detached')) { |
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| 284 | throw new DomainException('libsodium is not available'); |
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| 285 | } |
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| 286 | try { |
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| 287 | // The last non-empty line is used as the key. |
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| 288 | $lines = array_filter(explode("\n", $key)); |
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| 289 | $key = base64_decode(end($lines)); |
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| 290 | return sodium_crypto_sign_verify_detached($signature, $msg, $key); |
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| 291 | } catch (Exception $e) { |
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| 292 | throw new DomainException($e->getMessage(), 0, $e); |
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| 293 | } |
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| 294 | case 'hash_hmac': |
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| 295 | default: |
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| 296 | $hash = \hash_hmac($algorithm, $msg, $key, true); |
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| 297 | return self::constantTimeEquals($signature, $hash); |
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| 298 | } |
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| 299 | } |
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| 300 | |||
| 301 | /** |
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| 302 | * Decode a JSON string into a PHP object. |
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| 303 | * |
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| 304 | * @param string $input JSON string |
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| 305 | * |
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| 306 | * @return object Object representation of JSON string |
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| 307 | * |
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| 308 | * @throws DomainException Provided string was invalid JSON |
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| 309 | */ |
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| 310 | public static function jsonDecode($input) |
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| 311 | { |
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| 312 | if (\version_compare(PHP_VERSION, '5.4.0', '>=') && !(\defined('JSON_C_VERSION') && PHP_INT_SIZE > 4)) { |
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| 313 | /** In PHP >=5.4.0, json_decode() accepts an options parameter, that allows you |
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| 314 | * to specify that large ints (like Steam Transaction IDs) should be treated as |
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| 315 | * strings, rather than the PHP default behaviour of converting them to floats. |
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| 316 | */ |
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| 317 | $obj = \json_decode($input, false, 512, JSON_BIGINT_AS_STRING); |
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| 318 | } else { |
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| 319 | /** Not all servers will support that, however, so for older versions we must |
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| 320 | * manually detect large ints in the JSON string and quote them (thus converting |
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| 321 | *them to strings) before decoding, hence the preg_replace() call. |
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| 322 | */ |
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| 323 | $max_int_length = \strlen((string) PHP_INT_MAX) - 1; |
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| 324 | $json_without_bigints = \preg_replace('/:\s*(-?\d{'.$max_int_length.',})/', ': "$1"', $input); |
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| 325 | $obj = \json_decode($json_without_bigints); |
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| 326 | } |
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| 327 | |||
| 328 | if ($errno = \json_last_error()) { |
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| 329 | static::handleJsonError($errno); |
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| 330 | } elseif ($obj === null && $input !== 'null') { |
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| 331 | throw new DomainException('Null result with non-null input'); |
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| 332 | } |
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| 333 | return $obj; |
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| 334 | } |
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| 335 | |||
| 336 | /** |
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| 337 | * Encode a PHP object into a JSON string. |
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| 338 | * |
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| 339 | * @param object|array $input A PHP object or array |
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| 340 | * |
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| 341 | * @return string JSON representation of the PHP object or array |
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| 342 | * |
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| 343 | * @throws DomainException Provided object could not be encoded to valid JSON |
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| 344 | */ |
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| 345 | public static function jsonEncode($input) |
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| 346 | { |
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| 347 | $json = \json_encode($input); |
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| 348 | if ($errno = \json_last_error()) { |
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| 349 | static::handleJsonError($errno); |
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| 350 | } elseif ($json === 'null' && $input !== null) { |
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| 351 | throw new DomainException('Null result with non-null input'); |
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| 352 | } |
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| 353 | return $json; |
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| 354 | } |
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| 355 | |||
| 356 | /** |
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| 357 | * Decode a string with URL-safe Base64. |
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| 358 | * |
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| 359 | * @param string $input A Base64 encoded string |
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| 360 | * |
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| 361 | * @return string A decoded string |
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| 362 | */ |
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| 363 | public static function urlsafeB64Decode($input) |
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| 364 | { |
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| 365 | $remainder = \strlen($input) % 4; |
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| 366 | if ($remainder) { |
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| 367 | $padlen = 4 - $remainder; |
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| 368 | $input .= \str_repeat('=', $padlen); |
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| 369 | } |
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| 370 | return \base64_decode(\strtr($input, '-_', '+/')); |
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| 371 | } |
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| 372 | |||
| 373 | /** |
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| 374 | * Encode a string with URL-safe Base64. |
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| 375 | * |
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| 376 | * @param string $input The string you want encoded |
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| 377 | * |
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| 378 | * @return string The base64 encode of what you passed in |
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| 379 | */ |
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| 380 | public static function urlsafeB64Encode($input) |
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| 381 | { |
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| 382 | return \str_replace('=', '', \strtr(\base64_encode($input), '+/', '-_')); |
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| 383 | } |
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| 384 | |||
| 385 | |||
| 386 | /** |
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| 387 | * Determine if an algorithm has been provided for each Key |
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| 388 | * |
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| 389 | * @param Key|array<Key>|mixed $keyOrKeyArray |
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| 390 | * @param string|null $kid |
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| 391 | * |
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| 392 | * @throws UnexpectedValueException |
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| 393 | * |
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| 394 | * @return array containing the keyMaterial and algorithm |
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| 395 | */ |
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| 396 | private static function getKeyMaterialAndAlgorithm($keyOrKeyArray, $kid = null) |
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| 430 | ); |
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| 431 | } |
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| 432 | |||
| 433 | /** |
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| 434 | * @param string $left |
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| 435 | * @param string $right |
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| 436 | * @return bool |
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| 437 | */ |
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| 438 | public static function constantTimeEquals($left, $right) |
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| 439 | { |
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| 440 | if (\function_exists('hash_equals')) { |
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| 441 | return \hash_equals($left, $right); |
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| 442 | } |
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| 443 | $len = \min(static::safeStrlen($left), static::safeStrlen($right)); |
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| 444 | |||
| 445 | $status = 0; |
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| 446 | for ($i = 0; $i < $len; $i++) { |
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| 447 | $status |= (\ord($left[$i]) ^ \ord($right[$i])); |
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| 448 | } |
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| 449 | $status |= (static::safeStrlen($left) ^ static::safeStrlen($right)); |
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| 450 | |||
| 451 | return ($status === 0); |
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| 452 | } |
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| 453 | |||
| 454 | /** |
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| 455 | * Helper method to create a JSON error. |
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| 456 | * |
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| 457 | * @param int $errno An error number from json_last_error() |
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| 458 | * |
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| 459 | * @return void |
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| 460 | */ |
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| 461 | private static function handleJsonError($errno) |
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| 462 | { |
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| 463 | $messages = array( |
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| 464 | JSON_ERROR_DEPTH => 'Maximum stack depth exceeded', |
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| 465 | JSON_ERROR_STATE_MISMATCH => 'Invalid or malformed JSON', |
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| 466 | JSON_ERROR_CTRL_CHAR => 'Unexpected control character found', |
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| 467 | JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON', |
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| 468 | JSON_ERROR_UTF8 => 'Malformed UTF-8 characters' //PHP >= 5.3.3 |
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| 469 | ); |
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| 470 | throw new DomainException( |
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| 471 | isset($messages[$errno]) |
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| 472 | ? $messages[$errno] |
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| 473 | : 'Unknown JSON error: ' . $errno |
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| 474 | ); |
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| 475 | } |
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| 476 | |||
| 477 | /** |
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| 478 | * Get the number of bytes in cryptographic strings. |
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| 479 | * |
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| 480 | * @param string $str |
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| 481 | * |
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| 482 | * @return int |
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| 483 | */ |
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| 484 | private static function safeStrlen($str) |
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| 490 | } |
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| 491 | |||
| 492 | /** |
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| 493 | * Convert an ECDSA signature to an ASN.1 DER sequence |
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| 494 | * |
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| 495 | * @param string $sig The ECDSA signature to convert |
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| 496 | * @return string The encoded DER object |
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| 497 | */ |
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| 498 | private static function signatureToDER($sig) |
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| 499 | { |
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| 500 | // Separate the signature into r-value and s-value |
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| 501 | list($r, $s) = \str_split($sig, (int) (\strlen($sig) / 2)); |
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| 502 | |||
| 503 | // Trim leading zeros |
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| 504 | $r = \ltrim($r, "\x00"); |
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| 505 | $s = \ltrim($s, "\x00"); |
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| 506 | |||
| 507 | // Convert r-value and s-value from unsigned big-endian integers to |
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| 508 | // signed two's complement |
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| 509 | if (\ord($r[0]) > 0x7f) { |
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| 510 | $r = "\x00" . $r; |
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| 511 | } |
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| 512 | if (\ord($s[0]) > 0x7f) { |
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| 513 | $s = "\x00" . $s; |
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| 514 | } |
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| 515 | |||
| 516 | return self::encodeDER( |
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| 517 | self::ASN1_SEQUENCE, |
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| 518 | self::encodeDER(self::ASN1_INTEGER, $r) . |
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| 519 | self::encodeDER(self::ASN1_INTEGER, $s) |
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| 520 | ); |
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| 521 | } |
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| 522 | |||
| 523 | /** |
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| 524 | * Encodes a value into a DER object. |
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| 525 | * |
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| 526 | * @param int $type DER tag |
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| 527 | * @param string $value the value to encode |
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| 528 | * @return string the encoded object |
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| 529 | */ |
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| 530 | private static function encodeDER($type, $value) |
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| 544 | } |
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| 545 | |||
| 546 | /** |
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| 547 | * Encodes signature from a DER object. |
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| 548 | * |
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| 549 | * @param string $der binary signature in DER format |
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| 550 | * @param int $keySize the number of bits in the key |
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| 551 | * @return string the signature |
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| 552 | */ |
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| 553 | private static function signatureFromDER($der, $keySize) |
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| 554 | { |
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| 555 | // OpenSSL returns the ECDSA signatures as a binary ASN.1 DER SEQUENCE |
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| 556 | list($offset, $_) = self::readDER($der); |
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| 557 | list($offset, $r) = self::readDER($der, $offset); |
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| 558 | list($offset, $s) = self::readDER($der, $offset); |
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| 559 | |||
| 560 | // Convert r-value and s-value from signed two's compliment to unsigned |
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| 561 | // big-endian integers |
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| 562 | $r = \ltrim($r, "\x00"); |
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| 563 | $s = \ltrim($s, "\x00"); |
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| 564 | |||
| 565 | // Pad out r and s so that they are $keySize bits long |
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| 566 | $r = \str_pad($r, $keySize / 8, "\x00", STR_PAD_LEFT); |
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| 567 | $s = \str_pad($s, $keySize / 8, "\x00", STR_PAD_LEFT); |
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| 568 | |||
| 569 | return $r . $s; |
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| 570 | } |
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| 571 | |||
| 572 | /** |
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| 573 | * Reads binary DER-encoded data and decodes into a single object |
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| 574 | * |
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| 575 | * @param string $der the binary data in DER format |
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| 576 | * @param int $offset the offset of the data stream containing the object |
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| 577 | * to decode |
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| 578 | * @return array [$offset, $data] the new offset and the decoded object |
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| 579 | */ |
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| 580 | private static function readDER($der, $offset = 0) |
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| 610 | } |
||
| 611 | } |
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| 612 |
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The issue could also be caused by a filter entry in the build configuration. If the path has been excluded in your configuration, e.g.
excluded_paths: ["lib/*"], you can move it to the dependency path list as follows:For further information see https://scrutinizer-ci.com/docs/tools/php/php-scrutinizer/#list-dependency-paths