Handshake::hello() - Code Metrics - Inspection of "Add framed queries & refactoring operations" - tbolier/php-rethink-ql - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#18)

by Marc

created 2018-02-07 14:15 UTC

Handshake::hello() C

↳ Parent: Handshake

Complexity

Conditions	7
Paths	13

Size

Total Lines	35
Code Lines	20

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	19
CRAP Score	7

Importance

Changes

Metric	Value
cc	7
eloc	20
nc	13
nop	1
dl	0
loc	35
ccs	19
cts	19
cp	1
crap	7
rs	6.7272
c	0
b	0
f	0

<?php
declare(strict_types=1);

/**
 * @license http://www.apache.org/licenses/ Apache License 2.0
 * @license https://github.com/danielmewes/php-rql Apache License 2.0
 * @Author Daniel Mewes https://github.com/danielmewes
 * @Author Timon Bolier https://github.com/tbolier
 *
 * The Handshake class contains parts of code copied from the original PHP-RQL library under the Apache License 2.0:
 * @see https://github.com/danielmewes/php-rql/blob/master/rdb/Handshake.php
 *
 * Stating the following changes have been done to the parts of the code copied in the Handshake Class:
 * - Amendments to code styles and control structures.
 * - Abstraction of code to new methods to improve readability.
 * - Removed obsolete code.
 */

namespace TBolier\RethinkQL\Connection\Socket;

use Psr\Http\Message\StreamInterface;

class Handshake implements HandshakeInterface
{
    /**
     * @var string
     */
    private $username;

    /**
     * @var string
     */
    private $password;

    /**
     * @var string
     */
    private $protocolVersion = 0;

    /**
     * @var int
     */
    private $state;

    /**
     * @var string
     */
    private $myR;

    /**
     * @var string
     */
    private $clientFirstMessage;

    /**
     * @var string
     */
    private $serverSignature;

    /**
     * @var int
     */
    private $version;

    /**
     * @param string $username
     * @param string $password
     * @param int $version
     */
    public function __construct(string $username, string $password, int $version)
    {
        $this->username = $username;
        $this->password = $password;
        $this->state = 0;
        $this->version = $version;
    }

    /**
     * @inheritdoc
     * @throws \RuntimeException
     * @throws Exception
     */
    public function hello(StreamInterface $stream): void
    {
        try {
            $handshakeResponse = null;
            while (true) {
                if (!$stream->isWritable()) {
                    throw new Exception('Not connected');
                }

                $this->checkResponse($handshakeResponse);

                try {
                    $msg = $this->nextMessage($handshakeResponse);
                } catch (Exception $e) {
                    $stream->close();
                    throw $e;
                }

                if ($msg === 'successful') {
                    break;
                }

                if ($msg !== '') {
                    $stream->write($msg);
                }

                // Read null-terminated response
                $handshakeResponse = $stream->getContents();
            }
        } catch (Exception $e) {
            $stream->close();
            throw $e;
        }

    }

    /**
     * @param $response
     * @return string
     * @throws Exception
     */
    private function nextMessage(string $response = null): ?string
    {
        switch ($this->state) {
            case 0:
switch ($expr) {
    case "A": { //wrong
        doSomething();
        break;
    }
    case "B"; //wrong
        doSomething();
        break;
    case "C": //right
        doSomething();
        break;
}
                return $this->createHandshakeMessage($response);
            case 1:
                return $this->verifyProtocol($response);
            case 2:
                return $this->createAuthenticationMessage($response);
            case 3:
                return $this->verifyAuthentication($response);
            default:
                throw new Exception('Illegal handshake state');
        }
    }

    /**
     * @param string $password
     * @param string $salt
     * @param int $iterations
     * @return string
     */
    private function pkbdf2Hmac(string $password, string $salt, int $iterations): string
    {
        $t = hash_hmac('sha256', $salt . "\x00\x00\x00\x01", $password, true);
        $u = $t;
        for ($i = 0; $i < $iterations - 1; ++$i) {
            $t = hash_hmac('sha256', $t, $password, true);
            $u ^= $t;
        }

        return $u;
    }

    /**
     * @param null|string $response
     * @return string
     */
    private function createHandshakeMessage(?string $response): string
    {
        $response === null or die('Illegal handshake state');

        $this->myR = base64_encode(openssl_random_pseudo_bytes(18));
        $this->clientFirstMessage = 'n=' . $this->username . ',r=' . $this->myR;

        $binaryVersion = pack('V', $this->version);

        $this->state = 1;

        return
            $binaryVersion
            . json_encode(
                [
                    'protocol_version' => $this->protocolVersion,
                    'authentication_method' => 'SCRAM-SHA-256',
                    'authentication' => 'n,,' . $this->clientFirstMessage,
                ]
            )
            . \chr(0);
    }

    /**
     * @param null|string $response
     * @return string
     * @throws Exception
     */
    private function verifyProtocol(?string $response): string
    {
        if (strpos($response, 'ERROR') === 0) {
            throw new Exception(
                'Received an unexpected reply. You may be attempting to connect to '
                . 'a RethinkDB server that is too old for this driver. The minimum '
                . 'supported server version is 2.3.0.'
            );
        }

        $json = json_decode($response, true);
        if ($json['success'] === false) {
            throw new Exception('Handshake failed: ' . $json["error"]);
        }
        if ($this->protocolVersion > $json['max_protocol_version']
            || $this->protocolVersion < $json['min_protocol_version']) {
            throw new Exception('Unsupported protocol version.');
        }

        $this->state = 2;

        return '';
    }

    /**
     * @param $response
     * @return null|string
     * @throws Exception
     */
    private function createAuthenticationMessage($response): string
    {
        $json = json_decode($response, true);
        if ($json['success'] === false) {
            throw new Exception('Handshake failed: ' . $json['error']);
        }
        $serverFirstMessage = $json['authentication'];
        $authentication = [];
        foreach (explode(',', $json['authentication']) as $var) {
            $pair = explode('=', $var);
            $authentication[$pair[0]] = $pair[1];
        }
        $serverR = $authentication['r'];
        if (strpos($serverR, $this->myR) !== 0) {
            throw new Exception('Invalid nonce from server.');
        }
        $salt = base64_decode($authentication['s']);
        $iterations = (int)$authentication['i'];

        $clientFinalMessageWithoutProof = 'c=biws,r=' . $serverR;
        $saltedPassword = $this->pkbdf2Hmac($this->password, $salt, $iterations);
        $clientKey = hash_hmac('sha256', 'Client Key', $saltedPassword, true);
        $storedKey = hash('sha256', $clientKey, true);

        $authMessage =
            $this->clientFirstMessage . ',' . $serverFirstMessage . ',' . $clientFinalMessageWithoutProof;

        $clientSignature = hash_hmac('sha256', $authMessage, $storedKey, true);

        $clientProof = $clientKey ^ $clientSignature;

        $serverKey = hash_hmac('sha256', 'Server Key', $saltedPassword, true);

        $this->serverSignature = hash_hmac('sha256', $authMessage, $serverKey, true);

        $this->state = 3;

        return
            json_encode(
                [
                    'authentication' => $clientFinalMessageWithoutProof . ',p=' . base64_encode($clientProof),
                ]
            )
            . \chr(0);
    }

    /**
     * @param null|string $response
     * @return string
     * @throws Exception
     */
    private function verifyAuthentication(string $response): string
    {
        $json = json_decode($response, true);
        if ($json['success'] === false) {
            throw new Exception('Handshake failed: ' . $json['error']);
        }
        $authentication = [];
        foreach (explode(',', $json['authentication']) as $var) {
            $pair = explode('=', $var);
            $authentication[$pair[0]] = $pair[1];
        }

        $this->checkSignature(base64_decode($authentication['v']));

        $this->state = 4;

        return 'successful';
    }

    /**
     * @param null|string $handshakeResponse
     */
    private function checkResponse(?string $handshakeResponse)
    {
        if ($handshakeResponse !== null && preg_match('/^ERROR:\s(.+)$/i', $handshakeResponse,
                $errorMatch)) {
            throw new Exception($errorMatch[1]);
        }
    }

    /**
     * @param string $signature
     */
    private function checkSignature(string $signature)
    {
        if (!hash_equals($signature, $this->serverSignature)) {
            throw new Exception('Invalid server signature.');
        }
    }
}


1		<?php
2		declare(strict_types=1);
3
4		/**
5		* @license http://www.apache.org/licenses/ Apache License 2.0
6		* @license https://github.com/danielmewes/php-rql Apache License 2.0
7		* @Author Daniel Mewes https://github.com/danielmewes
8		* @Author Timon Bolier https://github.com/tbolier
9		*
10		* The Handshake class contains parts of code copied from the original PHP-RQL library under the Apache License 2.0:
11		* @see https://github.com/danielmewes/php-rql/blob/master/rdb/Handshake.php
12		*
13		* Stating the following changes have been done to the parts of the code copied in the Handshake Class:
14		* - Amendments to code styles and control structures.
15		* - Abstraction of code to new methods to improve readability.
16		* - Removed obsolete code.
17		*/
18
19		namespace TBolier\RethinkQL\Connection\Socket;
20
21		use Psr\Http\Message\StreamInterface;
22
23		class Handshake implements HandshakeInterface
24		{
25		/**
26		* @var string
27		*/
28		private $username;
29
30		/**
31		* @var string
32		*/
33		private $password;
34
35		/**
36		* @var string
37		*/
38		private $protocolVersion = 0;
39
40		/**
41		* @var int
42		*/
43		private $state;
44
45		/**
46		* @var string
47		*/
48		private $myR;
49
50		/**
51		* @var string
52		*/
53		private $clientFirstMessage;
54
55		/**
56		* @var string
57		*/
58		private $serverSignature;
59
60		/**
61		* @var int
62		*/
63		private $version;
64
65		/**
66		* @param string $username
67		* @param string $password
68		* @param int $version
69		*/
70	21	public function __construct(string $username, string $password, int $version)
71		{
72	21	$this->username = $username;
73	21	$this->password = $password;
74	21	$this->state = 0;
75	21	$this->version = $version;
76	21	}
77
78		/**
79		* @inheritdoc
80		* @throws \RuntimeException
81		* @throws Exception
82		*/
83	19	public function hello(StreamInterface $stream): void
84		{
85		try {
86	19	$handshakeResponse = null;
87	19	while (true) {
88	19	if (!$stream->isWritable()) {
89	1	throw new Exception('Not connected');
90		}
91
92	18	$this->checkResponse($handshakeResponse);
93
94		try {
95	18	$msg = $this->nextMessage($handshakeResponse);
96	2	} catch (Exception $e) {
97	2	$stream->close();
98	2	throw $e;
99		}
100
101	18	if ($msg === 'successful') {
102	14	break;
103		}
104
105	18	if ($msg !== '') {
106	18	$stream->write($msg);
107		}
108
109		// Read null-terminated response
110	18	$handshakeResponse = $stream->getContents();
111		}
112	5	} catch (Exception $e) {
113	5	$stream->close();
114	5	throw $e;
115		}
116
117	14	}
118
119		/**
120		* @param $response
121		* @return string
122		* @throws Exception
123		*/
124	18	private function nextMessage(string $response = null): ?string
125		{
126	18	switch ($this->state) {
127	18	case 0:
		0 ignored issues – show Coding Style introduced 2018-01-22 13:12 UTC by Report Bug Copy Issue Report `case` statements should be defined using a colon. As per the PSR-2 coding standard, case statements should not be wrapped in curly braces. There is no need for braces, since each case is terminated by the next `break`. There is also the option to use a semicolon instead of a colon, this is discouraged because many programmers do not even know it works and the colon is universal between programming languages. switch ($expr) { case "A": { //wrong doSomething(); break; } case "B"; //wrong doSomething(); break; case "C": //right doSomething(); break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
128	18	return $this->createHandshakeMessage($response);
129	16	case 1:
130	16	return $this->verifyProtocol($response);
131	14	case 2:
132	14	return $this->createAuthenticationMessage($response);
133	14	case 3:
134	14	return $this->verifyAuthentication($response);
135		default:
136		throw new Exception('Illegal handshake state');
137		}
138		}
139
140		/**
141		* @param string $password
142		* @param string $salt
143		* @param int $iterations
144		* @return string
145		*/
146	14	private function pkbdf2Hmac(string $password, string $salt, int $iterations): string
147		{
148	14	$t = hash_hmac('sha256', $salt . "\x00\x00\x00\x01", $password, true);
149	14	$u = $t;
150	14	for ($i = 0; $i < $iterations - 1; ++$i) {
151		$t = hash_hmac('sha256', $t, $password, true);
152		$u ^= $t;
153		}
154
155	14	return $u;
156		}
157
158		/**
159		* @param null\|string $response
160		* @return string
161		*/
162	18	private function createHandshakeMessage(?string $response): string
163		{
164	18	$response === null or die('Illegal handshake state');
165
166	18	$this->myR = base64_encode(openssl_random_pseudo_bytes(18));
167	18	$this->clientFirstMessage = 'n=' . $this->username . ',r=' . $this->myR;
168
169	18	$binaryVersion = pack('V', $this->version);
170
171	18	$this->state = 1;
172
173		return
174		$binaryVersion
175	18	. json_encode(
176		[
177	18	'protocol_version' => $this->protocolVersion,
178	18	'authentication_method' => 'SCRAM-SHA-256',
179	18	'authentication' => 'n,,' . $this->clientFirstMessage,
180		]
181		)
182	18	. \chr(0);
183		}
184
185		/**
186		* @param null\|string $response
187		* @return string
188		* @throws Exception
189		*/
190	16	private function verifyProtocol(?string $response): string
191		{
192	16	if (strpos($response, 'ERROR') === 0) {
193		throw new Exception(
194		'Received an unexpected reply. You may be attempting to connect to '
195		. 'a RethinkDB server that is too old for this driver. The minimum '
196		. 'supported server version is 2.3.0.'
197		);
198		}
199
200	16	$json = json_decode($response, true);
201	16	if ($json['success'] === false) {
202	1	throw new Exception('Handshake failed: ' . $json["error"]);
203		}
204	15	if ($this->protocolVersion > $json['max_protocol_version']
205	15	\|\| $this->protocolVersion < $json['min_protocol_version']) {
206	1	throw new Exception('Unsupported protocol version.');
207		}
208
209	14	$this->state = 2;
210
211	14	return '';
212		}
213
214		/**
215		* @param $response
216		* @return null\|string
217		* @throws Exception
218		*/
219	14	private function createAuthenticationMessage($response): string
220		{
221	14	$json = json_decode($response, true);
222	14	if ($json['success'] === false) {
223		throw new Exception('Handshake failed: ' . $json['error']);
224		}
225	14	$serverFirstMessage = $json['authentication'];
226	14	$authentication = [];
227	14	foreach (explode(',', $json['authentication']) as $var) {
228	14	$pair = explode('=', $var);
229	14	$authentication[$pair[0]] = $pair[1];
230		}
231	14	$serverR = $authentication['r'];
232	14	if (strpos($serverR, $this->myR) !== 0) {
233		throw new Exception('Invalid nonce from server.');
234		}
235	14	$salt = base64_decode($authentication['s']);
236	14	$iterations = (int)$authentication['i'];
237
238	14	$clientFinalMessageWithoutProof = 'c=biws,r=' . $serverR;
239	14	$saltedPassword = $this->pkbdf2Hmac($this->password, $salt, $iterations);
240	14	$clientKey = hash_hmac('sha256', 'Client Key', $saltedPassword, true);
241	14	$storedKey = hash('sha256', $clientKey, true);
242
243		$authMessage =
244	14	$this->clientFirstMessage . ',' . $serverFirstMessage . ',' . $clientFinalMessageWithoutProof;
245
246	14	$clientSignature = hash_hmac('sha256', $authMessage, $storedKey, true);
247
248	14	$clientProof = $clientKey ^ $clientSignature;
249
250	14	$serverKey = hash_hmac('sha256', 'Server Key', $saltedPassword, true);
251
252	14	$this->serverSignature = hash_hmac('sha256', $authMessage, $serverKey, true);
253
254	14	$this->state = 3;
255
256		return
257	14	json_encode(
258		[
259	14	'authentication' => $clientFinalMessageWithoutProof . ',p=' . base64_encode($clientProof),
260		]
261		)
262	14	. \chr(0);
263		}
264
265		/**
266		* @param null\|string $response
267		* @return string
268		* @throws Exception
269		*/
270	14	private function verifyAuthentication(string $response): string
271		{
272	14	$json = json_decode($response, true);
273	14	if ($json['success'] === false) {
274		throw new Exception('Handshake failed: ' . $json['error']);
275		}
276	14	$authentication = [];
277	14	foreach (explode(',', $json['authentication']) as $var) {
278	14	$pair = explode('=', $var);
279	14	$authentication[$pair[0]] = $pair[1];
280		}
281
282	14	$this->checkSignature(base64_decode($authentication['v']));
283
284	14	$this->state = 4;
285
286	14	return 'successful';
287		}
288
289		/**
290		* @param null\|string $handshakeResponse
291		*/
292	18	private function checkResponse(?string $handshakeResponse)
293		{
294	18	if ($handshakeResponse !== null && preg_match('/^ERROR:\s(.+)$/i', $handshakeResponse,
295	18	$errorMatch)) {
296	2	throw new Exception($errorMatch[1]);
297		}
298	18	}
299
300		/**
301		* @param string $signature
302		*/
303	14	private function checkSignature(string $signature)
304		{
305	14	if (!hash_equals($signature, $this->serverSignature)) {
306		throw new Exception('Invalid server signature.');
307		}
308	14	}
309		}
310

tbolier / php-rethink-ql

Pull Request — master (#18)

Handshake::hello() C

Complexity

Size

Duplication

Code Coverage

Importance

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