OATH_OCRAParser::parseOCRASuite() - Code Metrics - Inspection of "Build tool maintenance: enable php-scrutinizer-run..." - Tiqr/tiqr-server-libphp - Measure and Improve Code Quality continuously with Scrutinizer

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by Pieter van der

created 2022-02-04 14:47 UTC

OATH_OCRAParser::parseOCRASuite() D

↳ Parent: OATH_OCRAParser

Complexity

Conditions	38
Paths	43

Size

Total Lines	133
Code Lines	92

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	92
c	0
b	0
f	0
dl	0
loc	133
rs	4.1666
cc	38
nc	43
nop	1

How to fix Long Method Complexity

<?php

class OATH_OCRAParser {

	private $key = NULL;


	private $OCRASuite = NULL;

	private $OCRAVersion = NULL;

	private $CryptoFunctionType = NULL;
	private $CryptoFunctionHash = NULL;
	private $CryptoFunctionHashLength = NULL;
	private $CryptoFunctionTruncation = NULL;

	private $C = FALSE;
	private $Q = FALSE;
	private $QType = 'N';
	private $QLength = 8;

	private $P = FALSE;
	private $PType = 'SHA1';
	private $PLength = 20;

	private $S = FALSE;
	private $SLength = 64;

	private $T = FALSE;
	private $TLength = 60; // 1M
	private $TPeriods = array('H' => 3600, 'M' => 60, 'S' => 1);

	private $supportedHashFunctions = array('SHA1' => 20, 'SHA256' => 32, 'SHA512' => 64);


	public function __construct($ocraSuite) {
		$this->parseOCRASuite($ocraSuite);
	}

	/**
	 * Inspired by https://github.com/bdauvergne/python-oath
	 */
	private function parseOCRASuite($ocraSuite) {
		if (!is_string($ocraSuite)) {
			throw new Exception('OCRASuite not in string format: ' . var_export($ocraSuite, TRUE));
		}

		$ocraSuite = strtoupper($ocraSuite);
		$this->OCRASuite = $ocraSuite;

		$s = explode(':', $ocraSuite);
		if (count($s) != 3) {
			throw new Exception('Invalid OCRASuite format: ' . var_export($ocraSuite, TRUE));
		}

		$algo = explode('-', $s[0]);
		if (count($algo) != 2) {
			throw new Exception('Invalid OCRA version: ' . var_export($s[0], TRUE));
		}

		if ($algo[0] !== 'OCRA') {
			throw new Exception('Unsupported OCRA algorithm: ' . var_export($algo[0], TRUE));
		}

		if ($algo[1] !== '1') {
			throw new Exception('Unsupported OCRA version: ' . var_export($algo[1], TRUE));
		}
		$this->OCRAVersion = $algo[1];

		$cf = explode('-', $s[1]);
		if (count($cf) != 3) {
			throw new Exception('Invalid OCRA suite crypto function: ' . var_export($s[1], TRUE));
		}

		if ($cf[0] !== 'HOTP') {
			throw new Exception('Unsupported OCRA suite crypto function: ' . var_export($cf[0], TRUE));
		}
		$this->CryptoFunctionType = $cf[0];

		if (!array_key_exists($cf[1], $this->supportedHashFunctions)) {
			throw new Exception('Unsupported hash function in OCRA suite crypto function: ' . var_export($cf[1], TRUE));
		}
		$this->CryptoFunctionHash = $cf[1];
		$this->CryptoFunctionHashLength = $this->supportedHashFunctions[$cf[1]];

		if (!preg_match('/^\d+$/', $cf[2]) || (($cf[2] < 4 || $cf[2] > 10) && $cf[2] != 0)) {
			throw new Exception('Invalid OCRA suite crypto function truncation length: ' . var_export($cf[2], TRUE));
		}
		$this->CryptoFunctionTruncation = intval($cf[2]);

		$di = explode('-', $s[2]);
		if (count($cf) == 0) {
			throw new Exception('Invalid OCRA suite data input: ' . var_export($s[2], TRUE));
		}

		$data_input = array();
		foreach($di as $elem) {
			$letter = $elem[0];
			if (array_key_exists($letter, $data_input)) {
				throw new Exception('Duplicate field in OCRA suite data input: ' . var_export($elem, TRUE));
			}
			$data_input[$letter] = 1;

			if ($letter === 'C' && strlen($elem) == 1) {
				$this->C = TRUE;
			} elseif ($letter === 'Q') {
				if (strlen($elem) == 1) {
					$this->Q = TRUE;
				} elseif (preg_match('/^Q([AHN])(\d+)$/', $elem, $match)) {
					$q_len = intval($match[2]);
					if ($q_len < 4 || $q_len > 64) {
						throw new Exception('Invalid OCRA suite data input question length: ' . var_export($q_len, TRUE));
					}
					$this->Q = TRUE;
					$this->QType = $match[1];
					$this->QLength = $q_len;
				} else {
					throw new Exception('Invalid OCRA suite data input question: ' . var_export($elem, TRUE));
				}
			} elseif ($letter === 'P') {
				if (strlen($elem) == 1) {
					$this->P = TRUE;
				} else {
					$p_algo = substr($elem, 1);
					if (!array_key_exists($p_algo, $this->supportedHashFunctions)) {
						throw new Exception('Unsupported OCRA suite PIN hash function: ' . var_export($elem, TRUE));
					}
					$this->P = TRUE;
					$this->PType = $p_algo;
					$this->PLength = $this->supportedHashFunctions[$p_algo];
				}
			} elseif ($letter === 'S') {
				if (strlen($elem) == 1) {
					$this->S = TRUE;
				} elseif (preg_match('/^S(\d+)$/', $elem, $match)) {
					$s_len = intval($match[1]);
					if ($s_len <= 0 || $s_len > 512) {
						throw new Exception('Invalid OCRA suite data input session information length: ' . var_export($s_len, TRUE));
					}

					$this->S = TRUE;
					$this->SLength = $s_len;
				} else {
					throw new Exception('Invalid OCRA suite data input session information length: ' . var_export($elem, TRUE));
				}
			} elseif ($letter === 'T') {
				if (strlen($elem) == 1) {
					$this->T = TRUE;
				} elseif (preg_match('/^T(\d+[HMS])+$/', $elem)) {
					preg_match_all('/(\d+)([HMS])/', $elem, $match);

					if (count($match[1]) !== count(array_unique($match[2]))) {
						throw new Exception('Duplicate definitions in OCRA suite data input timestamp: ' . var_export($elem, TRUE));
					}

					$length = 0;
					for ($i = 0; $i < count($match[1]); $i++) {
for ($i=0; $i<count($array); $i++) { // calls count() on each iteration
}

// Better
for ($i=0, $c=count($array); $i<$c; $i++) { // calls count() just once
}
						$length += intval($match[1][$i]) * $this->TPeriods[$match[2][$i]];
					}
					if ($length <= 0) {
						throw new Exception('Invalid OCRA suite data input timestamp: ' . var_export($elem, TRUE));
					}

					$this->T = TRUE;
					$this->TLength = $length;
				} else {
					throw new Exception('Invalid OCRA suite data input timestamp: ' . var_export($elem, TRUE));
				}
			} else {
				throw new Exception('Unsupported OCRA suite data input field: ' . var_export($elem, TRUE));
			}
		}

		if (!$this->Q) {
			throw new Exception('OCRA suite data input question not defined: ' . var_export($s[2], TRUE));
		}
	}

	public function generateChallenge() {
		$q_length = $this->QLength;
		$q_type = $this->QType;

		$bytes = self::generateRandomBytes($q_length);

		switch($q_type) {
			case 'A':
				$challenge = base64_encode($bytes);
				$tr = implode("", unpack('H*', $bytes));
				$challenge = rtrim(strtr($challenge, '+/', $tr), '=');
				break;
			case 'H':
				$challenge = implode("", unpack('H*', $bytes));
				break;
			case 'N':
				$challenge = implode("", unpack('N*', $bytes));
				break;
			default:
				throw new Exception('Unsupported OCRASuite challenge type: ' . var_export($q_type, TRUE));
				break;
		}

		$challenge = substr($challenge, 0, $q_length);

		return $challenge;
	}


	public function generateSessionInformation() {
		if (!$this->S) {
			throw new Exception('Session information not defined in OCRASuite: ' . var_export($this->OCRASuite, TRUE));
		}

		$s_length = $this->SLength;
		$bytes = self::generateRandomBytes($s_length);

		// The OCRA spec doesn't specify that the session data should be hexadecimal.
		// However the reference implementation in the RFC does treat it as hex.
		$session = bin2hex($bytes);
		
		$session = substr($session, 0, $s_length);
		
		return $session;
	}

	/**
	 * Borrowed from SimpleSAMLPHP http://simplesamlphp.org/
	 */
	public static function generateRandomBytesMTrand($length) {

		/* Use mt_rand to generate $length random bytes. */
		$data = '';
		for($i = 0; $i < $length; $i++) {
			$data .= chr(mt_rand(0, 255));
		}

		return $data;
	}


	/**
	 * Borrowed from SimpleSAMLPHP http://simplesamlphp.org/
	 */
	public static function generateRandomBytes($length, $fallback = TRUE) {
		static $fp = NULL;

		if (function_exists('openssl_random_pseudo_bytes')) {
			return openssl_random_pseudo_bytes($length);
		}

		if($fp === NULL) {
			if (@file_exists('/dev/urandom')) {
				$fp = @fopen('/dev/urandom', 'rb');
			} else {
				$fp = FALSE;
			}
		}

		if($fp !== FALSE) {
			/* Read random bytes from /dev/urandom. */
			$data = fread($fp, $length);
			if($data === FALSE) {
				throw new Exception('Error reading random data.');
			}
			if(strlen($data) != $length) {
				if ($fallback) {
					$data = self::generateRandomBytesMTrand($length);
				} else {
					throw new Exception('Did not get requested number of bytes from random source. Requested (' . $length . ') got (' . strlen($data) . ')');
				}
			}
		} else {
			/* Use mt_rand to generate $length random bytes. */
			$data = self::generateRandomBytesMTrand($length);
		}

		return $data;
	}


	/**
	 * Constant time string comparison, see http://codahale.com/a-lesson-in-timing-attacks/
	 */
	public static function constEqual($s1, $s2) {
		if (strlen($s1) != strlen($s2)) {
			return FALSE;
		}

		$result = TRUE;
		$length = strlen($s1);
		for ($i = 0; $i < $length; $i++) {
			$result &= ($s1[$i] == $s2[$i]);
		}

		return (boolean)$result;
	}

}


1			<?php
2
3			class OATH_OCRAParser {
4
5			private $key = NULL;
			0 ignored issues – show introduced 2022-02-04 14:35 UTC by Report Bug Copy Issue Report The private property `$key` is not used, and could be removed. Loading history...
6
7			private $OCRASuite = NULL;
8
9			private $OCRAVersion = NULL;
10
11			private $CryptoFunctionType = NULL;
12			private $CryptoFunctionHash = NULL;
13			private $CryptoFunctionHashLength = NULL;
14			private $CryptoFunctionTruncation = NULL;
15
16			private $C = FALSE;
17			private $Q = FALSE;
18			private $QType = 'N';
19			private $QLength = 8;
20
21			private $P = FALSE;
22			private $PType = 'SHA1';
23			private $PLength = 20;
24
25			private $S = FALSE;
26			private $SLength = 64;
27
28			private $T = FALSE;
29			private $TLength = 60; // 1M
30			private $TPeriods = array('H' => 3600, 'M' => 60, 'S' => 1);
31
32			private $supportedHashFunctions = array('SHA1' => 20, 'SHA256' => 32, 'SHA512' => 64);
33
34
35			public function __construct($ocraSuite) {
36			$this->parseOCRASuite($ocraSuite);
37			}
38
39			/**
40			* Inspired by https://github.com/bdauvergne/python-oath
41			*/
42			private function parseOCRASuite($ocraSuite) {
43			if (!is_string($ocraSuite)) {
44			throw new Exception('OCRASuite not in string format: ' . var_export($ocraSuite, TRUE));
45			}
46
47			$ocraSuite = strtoupper($ocraSuite);
48			$this->OCRASuite = $ocraSuite;
49
50			$s = explode(':', $ocraSuite);
51			if (count($s) != 3) {
52			throw new Exception('Invalid OCRASuite format: ' . var_export($ocraSuite, TRUE));
53			}
54
55			$algo = explode('-', $s[0]);
56			if (count($algo) != 2) {
57			throw new Exception('Invalid OCRA version: ' . var_export($s[0], TRUE));
58			}
59
60			if ($algo[0] !== 'OCRA') {
61			throw new Exception('Unsupported OCRA algorithm: ' . var_export($algo[0], TRUE));
62			}
63
64			if ($algo[1] !== '1') {
65			throw new Exception('Unsupported OCRA version: ' . var_export($algo[1], TRUE));
66			}
67			$this->OCRAVersion = $algo[1];
68
69			$cf = explode('-', $s[1]);
70			if (count($cf) != 3) {
71			throw new Exception('Invalid OCRA suite crypto function: ' . var_export($s[1], TRUE));
72			}
73
74			if ($cf[0] !== 'HOTP') {
75			throw new Exception('Unsupported OCRA suite crypto function: ' . var_export($cf[0], TRUE));
76			}
77			$this->CryptoFunctionType = $cf[0];
78
79			if (!array_key_exists($cf[1], $this->supportedHashFunctions)) {
80			throw new Exception('Unsupported hash function in OCRA suite crypto function: ' . var_export($cf[1], TRUE));
81			}
82			$this->CryptoFunctionHash = $cf[1];
83			$this->CryptoFunctionHashLength = $this->supportedHashFunctions[$cf[1]];
84
85			if (!preg_match('/^\d+$/', $cf[2]) \|\| (($cf[2] < 4 \|\| $cf[2] > 10) && $cf[2] != 0)) {
86			throw new Exception('Invalid OCRA suite crypto function truncation length: ' . var_export($cf[2], TRUE));
87			}
88			$this->CryptoFunctionTruncation = intval($cf[2]);
89
90			$di = explode('-', $s[2]);
91			if (count($cf) == 0) {
92			throw new Exception('Invalid OCRA suite data input: ' . var_export($s[2], TRUE));
93			}
94
95			$data_input = array();
96			foreach($di as $elem) {
97			$letter = $elem[0];
98			if (array_key_exists($letter, $data_input)) {
99			throw new Exception('Duplicate field in OCRA suite data input: ' . var_export($elem, TRUE));
100			}
101			$data_input[$letter] = 1;
102
103			if ($letter === 'C' && strlen($elem) == 1) {
104			$this->C = TRUE;
105			} elseif ($letter === 'Q') {
106			if (strlen($elem) == 1) {
107			$this->Q = TRUE;
108			} elseif (preg_match('/^Q([AHN])(\d+)$/', $elem, $match)) {
109			$q_len = intval($match[2]);
110			if ($q_len < 4 \|\| $q_len > 64) {
111			throw new Exception('Invalid OCRA suite data input question length: ' . var_export($q_len, TRUE));
112			}
113			$this->Q = TRUE;
114			$this->QType = $match[1];
115			$this->QLength = $q_len;
116			} else {
117			throw new Exception('Invalid OCRA suite data input question: ' . var_export($elem, TRUE));
118			}
119			} elseif ($letter === 'P') {
120			if (strlen($elem) == 1) {
121			$this->P = TRUE;
122			} else {
123			$p_algo = substr($elem, 1);
124			if (!array_key_exists($p_algo, $this->supportedHashFunctions)) {
125			throw new Exception('Unsupported OCRA suite PIN hash function: ' . var_export($elem, TRUE));
126			}
127			$this->P = TRUE;
128			$this->PType = $p_algo;
129			$this->PLength = $this->supportedHashFunctions[$p_algo];
130			}
131			} elseif ($letter === 'S') {
132			if (strlen($elem) == 1) {
133			$this->S = TRUE;
134			} elseif (preg_match('/^S(\d+)$/', $elem, $match)) {
135			$s_len = intval($match[1]);
136			if ($s_len <= 0 \|\| $s_len > 512) {
137			throw new Exception('Invalid OCRA suite data input session information length: ' . var_export($s_len, TRUE));
138			}
139
140			$this->S = TRUE;
141			$this->SLength = $s_len;
142			} else {
143			throw new Exception('Invalid OCRA suite data input session information length: ' . var_export($elem, TRUE));
144			}
145			} elseif ($letter === 'T') {
146			if (strlen($elem) == 1) {
147			$this->T = TRUE;
148			} elseif (preg_match('/^T(\d+[HMS])+$/', $elem)) {
149			preg_match_all('/(\d+)([HMS])/', $elem, $match);
150
151			if (count($match[1]) !== count(array_unique($match[2]))) {
152			throw new Exception('Duplicate definitions in OCRA suite data input timestamp: ' . var_export($elem, TRUE));
153			}
154
155			$length = 0;
156			for ($i = 0; $i < count($match[1]); $i++) {
			0 ignored issues – show Performance Best Practice introduced 2022-02-04 14:35 UTC by Report Bug Copy Issue Report It seems like you are calling the size function `count()` as part of the test condition. You might want to compute the size beforehand, and not on each iteration. If the size of the collection does not change during the iteration, it is generally a good practice to compute it beforehand, and not on each iteration: for ($i=0; $i<count($array); $i++) { // calls count() on each iteration } // Better for ($i=0, $c=count($array); $i<$c; $i++) { // calls count() just once } Loading history...
157			$length += intval($match[1][$i]) * $this->TPeriods[$match[2][$i]];
158			}
159			if ($length <= 0) {
160			throw new Exception('Invalid OCRA suite data input timestamp: ' . var_export($elem, TRUE));
161			}
162
163			$this->T = TRUE;
164			$this->TLength = $length;
165			} else {
166			throw new Exception('Invalid OCRA suite data input timestamp: ' . var_export($elem, TRUE));
167			}
168			} else {
169			throw new Exception('Unsupported OCRA suite data input field: ' . var_export($elem, TRUE));
170			}
171			}
172
173			if (!$this->Q) {
174			throw new Exception('OCRA suite data input question not defined: ' . var_export($s[2], TRUE));
175			}
176			}
177
178			public function generateChallenge() {
179			$q_length = $this->QLength;
180			$q_type = $this->QType;
181
182			$bytes = self::generateRandomBytes($q_length);
183
184			switch($q_type) {
185			case 'A':
186			$challenge = base64_encode($bytes);
187			$tr = implode("", unpack('H*', $bytes));
188			$challenge = rtrim(strtr($challenge, '+/', $tr), '=');
189			break;
190			case 'H':
191			$challenge = implode("", unpack('H*', $bytes));
192			break;
193			case 'N':
194			$challenge = implode("", unpack('N*', $bytes));
195			break;
196			default:
197			throw new Exception('Unsupported OCRASuite challenge type: ' . var_export($q_type, TRUE));
198			break;
199			}
200
201			$challenge = substr($challenge, 0, $q_length);
202
203			return $challenge;
204			}
205
206
207			public function generateSessionInformation() {
208			if (!$this->S) {
209			throw new Exception('Session information not defined in OCRASuite: ' . var_export($this->OCRASuite, TRUE));
210			}
211
212			$s_length = $this->SLength;
213			$bytes = self::generateRandomBytes($s_length);
214
215			// The OCRA spec doesn't specify that the session data should be hexadecimal.
216			// However the reference implementation in the RFC does treat it as hex.
217			$session = bin2hex($bytes);
218
219			$session = substr($session, 0, $s_length);
220
221			return $session;
222			}
223
224			/**
225			* Borrowed from SimpleSAMLPHP http://simplesamlphp.org/
226			*/
227			public static function generateRandomBytesMTrand($length) {
228
229			/* Use mt_rand to generate $length random bytes. */
230			$data = '';
231			for($i = 0; $i < $length; $i++) {
232			$data .= chr(mt_rand(0, 255));
233			}
234
235			return $data;
236			}
237
238
239			/**
240			* Borrowed from SimpleSAMLPHP http://simplesamlphp.org/
241			*/
242			public static function generateRandomBytes($length, $fallback = TRUE) {
243			static $fp = NULL;
244
245			if (function_exists('openssl_random_pseudo_bytes')) {
246			return openssl_random_pseudo_bytes($length);
247			}
248
249			if($fp === NULL) {
250			if (@file_exists('/dev/urandom')) {
251			$fp = @fopen('/dev/urandom', 'rb');
252			} else {
253			$fp = FALSE;
254			}
255			}
256
257			if($fp !== FALSE) {
258			/* Read random bytes from /dev/urandom. */
259			$data = fread($fp, $length);
260			if($data === FALSE) {
261			throw new Exception('Error reading random data.');
262			}
263			if(strlen($data) != $length) {
264			if ($fallback) {
265			$data = self::generateRandomBytesMTrand($length);
266			} else {
267			throw new Exception('Did not get requested number of bytes from random source. Requested (' . $length . ') got (' . strlen($data) . ')');
268			}
269			}
270			} else {
271			/* Use mt_rand to generate $length random bytes. */
272			$data = self::generateRandomBytesMTrand($length);
273			}
274
275			return $data;
276			}
277
278
279			/**
280			* Constant time string comparison, see http://codahale.com/a-lesson-in-timing-attacks/
281			*/
282			public static function constEqual($s1, $s2) {
283			if (strlen($s1) != strlen($s2)) {
284			return FALSE;
285			}
286
287			$result = TRUE;
288			$length = strlen($s1);
289			for ($i = 0; $i < $length; $i++) {
290			$result &= ($s1[$i] == $s2[$i]);
291			}
292
293			return (boolean)$result;
294			}
295
296			}
297

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OATH_OCRAParser::parseOCRASuite() D

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