-
Notifications
You must be signed in to change notification settings - Fork 147
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
[ENH] Adding SCRAM-SHA authentication mechanisms to cypht
- Loading branch information
Showing
5 changed files
with
358 additions
and
89 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| <?php | ||
|
|
||
| class ScramAuthenticator { | ||
|
|
||
| private $hashes = array( | ||
| 'sha-1' => 'sha1', | ||
| 'sha1' => 'sha1', | ||
| 'sha-224' => 'sha224', | ||
| 'sha224' => 'sha224', | ||
| 'sha-256' => 'sha256', | ||
| 'sha256' => 'sha256', | ||
| 'sha-384' => 'sha384', | ||
| 'sha384' => 'sha384', | ||
| 'sha-512' => 'sha512', | ||
| 'sha512' => 'sha512' | ||
| ); | ||
|
|
||
| private function getHashAlgorithm($scramAlgorithm) { | ||
| $parts = explode('-', strtolower($scramAlgorithm)); | ||
| return $this->hashes[$parts[1]] ?? 'sha1'; // Default to sha1 if the algorithm is not found | ||
| } | ||
| private function log($message) { | ||
| echo "[DEBUG] " . $message . "\n"; | ||
| } | ||
| public function generateClientProof($username, $password, $salt, $clientNonce, $serverNonce, $algorithm) { | ||
| $iterations = 4096; | ||
| $keyLength = strlen(hash($algorithm, '', true)); // Dynamically determine key length based on algorithm | ||
|
|
||
| $passwordBytes = hash($algorithm, $password, true); | ||
| $saltedPassword = hash_pbkdf2($algorithm, $passwordBytes, $salt, $iterations, $keyLength, true); | ||
| $clientKey = hash_hmac($algorithm, "Client Key", $saltedPassword, true); | ||
| $storedKey = hash($algorithm, $clientKey, true); | ||
| $authMessage = 'n=' . $username . ',r=' . $clientNonce . ',s=' . base64_encode($salt) . ',r=' . $serverNonce; | ||
| $clientSignature = hash_hmac($algorithm, $authMessage, $storedKey, true); | ||
| $clientProof = base64_encode($clientKey ^ $clientSignature); | ||
| $this->log("Client proof generated successfully"); | ||
| return $clientProof; | ||
| } | ||
|
|
||
| public function authenticateScram($scramAlgorithm, $username, $password, $getServerResponse, $sendCommand) { | ||
| $algorithm = $this->getHashAlgorithm($scramAlgorithm); | ||
|
|
||
| // Send initial SCRAM command | ||
| $scramCommand = 'AUTHENTICATE ' . $scramAlgorithm . "\r\n"; | ||
| $sendCommand($scramCommand); | ||
| $response = $getServerResponse(); | ||
| if (!empty($response) && substr($response[0], 0, 2) == '+ ') { | ||
| $this->log("Received server challenge: " . $response[0]); | ||
| // Extract salt and server nonce from the server's challenge | ||
| $serverChallenge = base64_decode(substr($response[0], 2)); | ||
| $parts = explode(',', $serverChallenge); | ||
| $serverNonce = base64_decode(substr($parts[0], strpos($parts[0], "=") + 1)); | ||
| $salt = base64_decode(substr($parts[1], strpos($parts[1], "=") + 1)); | ||
|
|
||
| // Generate client nonce | ||
| $clientNonce = base64_encode(random_bytes(32)); | ||
| $this->log("Generated client nonce: " . $clientNonce); | ||
|
|
||
| // Calculate client proof | ||
| $clientProof = $this->generateClientProof($username, $password, $salt, $clientNonce, $serverNonce, $algorithm); | ||
|
|
||
| // Construct client final message | ||
| $channelBindingData = (stripos($scramAlgorithm, 'plus') !== false) ? 'c=' . base64_encode('tls-unique') . ',' : 'c=biws,'; | ||
| $clientFinalMessage = $channelBindingData . 'r=' . $serverNonce . $clientNonce . ',p=' . $clientProof; | ||
| $clientFinalMessageEncoded = base64_encode($clientFinalMessage); | ||
| $this->log("Sending client final message: " . $clientFinalMessageEncoded); | ||
| // Send client final message to server | ||
| $sendCommand($clientFinalMessageEncoded . "\r\n"); | ||
|
|
||
| // Verify server's response | ||
| $response = $getServerResponse(); | ||
| if (!empty($response) && substr($response[0], 0, 2) == '+ ') { | ||
| $serverFinalMessage = base64_decode(substr($response[0], 2)); | ||
| $parts = explode(',', $serverFinalMessage); | ||
| $serverProof = substr($parts[0], strpos($parts[0], "=") + 1); | ||
|
|
||
| // Generate server key | ||
| $passwordBytes = hash($algorithm, $password, true); | ||
| $saltedPassword = hash_pbkdf2($algorithm, $passwordBytes, $salt, 4096, strlen(hash($algorithm, '', true)), true); | ||
| $serverKey = hash_hmac($algorithm, "Server Key", $saltedPassword, true); | ||
|
|
||
| // Calculate server signature | ||
| $authMessage = 'n=' . $username . ',r=' . $clientNonce . ',s=' . base64_encode($salt) . ',r=' . $serverNonce; | ||
| $serverSignature = base64_encode(hash_hmac($algorithm, $authMessage, $serverKey, true)); | ||
|
|
||
| // Compare server signature with server proof | ||
| if ($serverSignature === $serverProof) { | ||
| $this->log("SCRAM authentication successful"); | ||
| return true; // Authentication successful if they match | ||
| } else { | ||
| $this->log("SCRAM authentication failed: Server signature mismatch"); | ||
| } | ||
| } else { | ||
| $this->log("SCRAM authentication failed: Invalid server final response"); | ||
| } | ||
| } else { | ||
| $this->log("SCRAM authentication failed: Invalid server challenge"); | ||
| } | ||
| return false; // Authentication failed | ||
| } | ||
| } | ||
|
|
||
|
|
||
| ?> |
Oops, something went wrong.