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Merge pull request #13 from okonomiyaki3000/cram-md5

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New AuthType: CRAM-MD5
This commit is contained in:
Marcus Bointon 2012-12-04 01:10:01 -08:00
commit c7ff6fb2a1
1 changed files with 71 additions and 0 deletions
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71
class.smtp.php
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@ -414,10 +414,81 @@ class SMTP {
return false;
}
break;
case 'CRAM-MD5':
// Start authentication
fputs($this->smtp_conn,"AUTH CRAM-MD5" . $this->CRLF);
$rply = $this->get_lines();
$code = substr($rply,0,3);
if($code != 334) {
$this->error =
array("error" => "AUTH not accepted from server",
"smtp_code" => $code,
"smtp_msg" => substr($rply,4));
if($this->do_debug >= 1) {
$this->edebug("SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '<br />');
}
return false;
}
// Get the challenge
$challenge = base64_decode(substr($rply,4));
// Build the response
$response = $username . ' ' . $this->hmac($challenge, $password);
// Send encoded credentials
fputs($this->smtp_conn, base64_encode($response) . $this->CRLF);
$rply = $this->get_lines();
$code = substr($rply,0,3);
if($code != 334) {
$this->error =
array("error" => "Credentials not accepted from server",
"smtp_code" => $code,
"smtp_msg" => substr($rply,4));
if($this->do_debug >= 1) {
$this->edebug("SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '<br />');
}
return false;
}
break;
}
return true;
}
/**
* Works like hash_hmac('md5', $data, $key) in case that function is not available
* @access private
* @return string
*/
private function hmac($data, $key) {
if (function_exists('hash_hmac')) {
return hash_hmac('md5', $data, $key);
}
// The following borrowed from http://php.net/manual/en/function.mhash.php#27225
// RFC 2104 HMAC implementation for php.
// Creates an md5 HMAC.
// Eliminates the need to install mhash to compute a HMAC
// Hacked by Lance Rushing
$b = 64; // byte length for md5
if (strlen($key) > $b) {
$key = pack("H*",md5($key));
}
$key = str_pad($key, $b, chr(0x00));
$ipad = str_pad('', $b, chr(0x36));
$opad = str_pad('', $b, chr(0x5c));
$k_ipad = $key ^ $ipad ;
$k_opad = $key ^ $opad;
return md5($k_opad . pack("H*",md5($k_ipad . $data)));
}
/**
* Returns true if connected to a server otherwise false
* @access public