Authorization::getTimeDrift() - Code Metrics - ncryptf/ncryptf-php - Measure and Improve Code Quality continuously with Scrutinizer

Authorization::getTimeDrift() A
last analyzed 2022-11-30 23:22 UTC

↳ Parent: Authorization

Complexity

Conditions	2
Paths	2

Size

Total Lines	12
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes	2
Bugs	0	Features	0

Metric	Value
eloc	7
c	2
b	0
f	0
dl	0
loc	12
rs	10
cc	2
nc	2
nop	1

<?php declare(strict_types=1);

namespace ncryptf;

use DateTime;
use ncryptf\Signature;
use ncryptf\Token;

final class Authorization
{
    /**
     * The HMAC info parameter. Overwrite this class and redeclare to change.
     */
    const AUTH_INFO = 'HMAC|AuthenticationKey';

    /**
     * The HMAC algorithm. Overwrite this class and redeclare to change.
     */
    const HMAC_ALGO = 'sha256';

    /**
     * Token object containing the access token and initial key material
     *
     * @var Token
     */
    private $token;

    /**
     * 32 byte salt array
     *
     * @var string
     */
    private $salt;

    /**
     * RFC1123 representation of the date
     *
     * @var string
     */
    private $date;

    /**
     * The generated signature
     *
     * @var string
     */
    private $signature;

    /**
     * 32 byte HMAC
     *
     * @var string
     */
    private $hmac;

    /**
     * The header version to generate
     *
     * @var integer
     */
    private $version = 2;

    /**
     * Calculates the authorization header information
     *
     * @param string $httpMethod    The HTTP method
     * @param string $uri           The full URI with query string parameters
     * @param Token $token          A token object containing the ikm, access token, and other authentication attributes
     * @param DateTime $date        The date
     * @param array|string $payload Array representation of the payload
     * @param integer $version      The authorization version, by default this is 2
     * @param string $salt          An optional fixed salt value
     */
    public function __construct(string $httpMethod, string $uri, Token $token, DateTime $date, $payload = '', int $version = 2, string $salt = null)
    {
        $httpMethod = \strtoupper($httpMethod);
        $this->salt = $salt ?? \random_bytes(32);
        $this->signature = Signature::derive($httpMethod, $uri, $this->salt, $date, $payload, $version);

        $hkdf = hash_hkdf(static::HMAC_ALGO, $token->ikm, 0, static::AUTH_INFO, $this->salt);

        $this->hmac = \hash_hmac('sha256', $this->signature, \bin2hex($hkdf), true);
        $this->version = $version;
        $this->date = $date->format(\DateTime::RFC1123);
        $this->token = $token;
    }

    /**
     * Extracts the HMAC parameters from a header string
     *
     * @param string $hmacHeader
     * @return array|boolean
     */
    public static function extractParamsFromHeaderString(string $hmacHeader = null)
    {
        if ($hmacHeader !== null && preg_match('/^HMAC\s+(.*?)$/', $hmacHeader, $matches)) {
            if (\strpos($matches[1], ',') !== false) {
                $params = explode(',', trim($matches[1]));

                if (count($params) !== 3) {
                    return false;
                }

                return [
                    'access_token' => $params[0],
                    'hmac' => $params[1],
                    'salt' => $params[2],
                    'v' => 1,
                    'date' => null,
                ];
            } else {
                $params = \json_decode(\base64_decode($matches[1]), true);

                if (!isset($params['v']) ||
                    !isset($params['access_token']) ||
                    !isset($params['hmac']) ||
                    !isset($params['salt']) ||
                    !isset($params['v']) ||
                    !isset($params['date'])
                ) {
                    return false;
                }

                return $params;
            }
        }

        return false;
    }

    /**
     * Returns the signature string
     *
     * @return string
     */
    public function getSignatureString() : string
    {
        return $this->signature;
    }

    /**
     * Returns the generated HMAC
     *
     * @return string
     */
    public function getHMAC() : string
    {
        return $this->hmac;
    }

    /**
     * Returns the base64 encoded HMAC
     *
     * @return string
     */
    public function getEncodedHMAC() : string
    {
        return \base64_encode($this->hmac);
    }

    /**
     * Returns the base64 encoded salt
     *
     * @return string
     */
    public function getEncodedSalt() : string
    {
        return \base64_encode($this->salt);
    }

    /**
     * Returns an RFC1123 formatted date
     *
     * @return string
     */
    public function getDate() : string
    {
        return $this->date;
    }

    /**
     * Generates the versions HMAC header
     *
     * @return string
     */
    public function getHeader() : string
    {
        $salt = $this->getEncodedSalt();
        $hmac = $this->getEncodedHMAC();

        if ($this->version === 2) {
            $data = \base64_encode(\json_encode([
                'access_token' => $this->token->accessToken,
                'date' => $this->date,
                'hmac' => $hmac,
                'salt' => $salt,
                'v' => 2
            ]));

            return "HMAC {$data}";
        }

        // The version 1 HMAC is returned by default
        return "HMAC {$this->token->accessToken},{$hmac},{$salt}";
    }

    /**
     * Validates a provided HMAC against an auth object and a drift
     *
     * @param string $hmac  byte[] HMAC
     * @param self $auth    Authorization object
     * @param integer $driftAllowance
     * @return boolean
     */
    public function verify(string $hmac, self $auth, int $driftAllowance = 90) : bool
    {
        $drift = $this->getTimeDrift($auth->getDate());
        if ($drift === null || $drift >= $driftAllowance) {
            return false;
        }

        try {
            if (\sodium_memcmp($hmac, $auth->getHMAC()) === 0) {
                return true;
            }
        } catch (\SodiumException $e) {
            return false;
        }

        return false;
    }

    /**
     * Calculates the time difference between now and the provided date
     *
     * @param string $date
     * @return int|boolean
     */
    private function getTimeDrift(string $date) :? int
    {
        $now = new \DateTime();
        $now->format(\DateTime::RFC1123);

        try {
            $realDate = new DateTime($date);
        } catch (\Exception $e) {
            return null;
        }

        return (int)\abs($now->getTimestamp() - $realDate->getTimestamp());
    }
}


1			<?php declare(strict_types=1);
2
3			namespace ncryptf;
4
5			use DateTime;
6			use ncryptf\Signature;
7			use ncryptf\Token;
8
9			final class Authorization
10			{
11			/**
12			* The HMAC info parameter. Overwrite this class and redeclare to change.
13			*/
14			const AUTH_INFO = 'HMAC\|AuthenticationKey';
15
16			/**
17			* The HMAC algorithm. Overwrite this class and redeclare to change.
18			*/
19			const HMAC_ALGO = 'sha256';
20
21			/**
22			* Token object containing the access token and initial key material
23			*
24			* @var Token
25			*/
26			private $token;
27
28			/**
29			* 32 byte salt array
30			*
31			* @var string
32			*/
33			private $salt;
34
35			/**
36			* RFC1123 representation of the date
37			*
38			* @var string
39			*/
40			private $date;
41
42			/**
43			* The generated signature
44			*
45			* @var string
46			*/
47			private $signature;
48
49			/**
50			* 32 byte HMAC
51			*
52			* @var string
53			*/
54			private $hmac;
55
56			/**
57			* The header version to generate
58			*
59			* @var integer
60			*/
61			private $version = 2;
62
63			/**
64			* Calculates the authorization header information
65			*
66			* @param string $httpMethod The HTTP method
67			* @param string $uri The full URI with query string parameters
68			* @param Token $token A token object containing the ikm, access token, and other authentication attributes
69			* @param DateTime $date The date
70			* @param array\|string $payload Array representation of the payload
71			* @param integer $version The authorization version, by default this is 2
72			* @param string $salt An optional fixed salt value
73			*/
74			public function __construct(string $httpMethod, string $uri, Token $token, DateTime $date, $payload = '', int $version = 2, string $salt = null)
75			{
76			$httpMethod = \strtoupper($httpMethod);
77			$this->salt = $salt ?? \random_bytes(32);
78			$this->signature = Signature::derive($httpMethod, $uri, $this->salt, $date, $payload, $version);
79
80			$hkdf = hash_hkdf(static::HMAC_ALGO, $token->ikm, 0, static::AUTH_INFO, $this->salt);
81
82			$this->hmac = \hash_hmac('sha256', $this->signature, \bin2hex($hkdf), true);
83			$this->version = $version;
84			$this->date = $date->format(\DateTime::RFC1123);
85			$this->token = $token;
86			}
87
88			/**
89			* Extracts the HMAC parameters from a header string
90			*
91			* @param string $hmacHeader
92			* @return array\|boolean
93			*/
94			public static function extractParamsFromHeaderString(string $hmacHeader = null)
95			{
96			if ($hmacHeader !== null && preg_match('/^HMAC\s+(.*?)$/', $hmacHeader, $matches)) {
97			if (\strpos($matches[1], ',') !== false) {
98			$params = explode(',', trim($matches[1]));
99
100			if (count($params) !== 3) {
101			return false;
102			}
103
104			return [
105			'access_token' => $params[0],
106			'hmac' => $params[1],
107			'salt' => $params[2],
108			'v' => 1,
109			'date' => null,
110			];
111			} else {
112			$params = \json_decode(\base64_decode($matches[1]), true);
113
114			if (!isset($params['v']) \|\|
115			!isset($params['access_token']) \|\|
116			!isset($params['hmac']) \|\|
117			!isset($params['salt']) \|\|
118			!isset($params['v']) \|\|
119			!isset($params['date'])
120			) {
121			return false;
122			}
123
124			return $params;
125			}
126			}
127
128			return false;
129			}
130
131			/**
132			* Returns the signature string
133			*
134			* @return string
135			*/
136			public function getSignatureString() : string
137			{
138			return $this->signature;
139			}
140
141			/**
142			* Returns the generated HMAC
143			*
144			* @return string
145			*/
146			public function getHMAC() : string
147			{
148			return $this->hmac;
149			}
150
151			/**
152			* Returns the base64 encoded HMAC
153			*
154			* @return string
155			*/
156			public function getEncodedHMAC() : string
157			{
158			return \base64_encode($this->hmac);
159			}
160
161			/**
162			* Returns the base64 encoded salt
163			*
164			* @return string
165			*/
166			public function getEncodedSalt() : string
167			{
168			return \base64_encode($this->salt);
169			}
170
171			/**
172			* Returns an RFC1123 formatted date
173			*
174			* @return string
175			*/
176			public function getDate() : string
177			{
178			return $this->date;
179			}
180
181			/**
182			* Generates the versions HMAC header
183			*
184			* @return string
185			*/
186			public function getHeader() : string
187			{
188			$salt = $this->getEncodedSalt();
189			$hmac = $this->getEncodedHMAC();
190
191			if ($this->version === 2) {
192			$data = \base64_encode(\json_encode([
193			'access_token' => $this->token->accessToken,
194			'date' => $this->date,
195			'hmac' => $hmac,
196			'salt' => $salt,
197			'v' => 2
198			]));
199
200			return "HMAC {$data}";
201			}
202
203			// The version 1 HMAC is returned by default
204			return "HMAC {$this->token->accessToken},{$hmac},{$salt}";
205			}
206
207			/**
208			* Validates a provided HMAC against an auth object and a drift
209			*
210			* @param string $hmac byte[] HMAC
211			* @param self $auth Authorization object
212			* @param integer $driftAllowance
213			* @return boolean
214			*/
215			public function verify(string $hmac, self $auth, int $driftAllowance = 90) : bool
216			{
217			$drift = $this->getTimeDrift($auth->getDate());
218			if ($drift === null \|\| $drift >= $driftAllowance) {
219			return false;
220			}
221
222			try {
223			if (\sodium_memcmp($hmac, $auth->getHMAC()) === 0) {
224			return true;
225			}
226			} catch (\SodiumException $e) {
227			return false;
228			}
229
230			return false;
231			}
232
233			/**
234			* Calculates the time difference between now and the provided date
235			*
236			* @param string $date
237			* @return int\|boolean
238			*/
239			private function getTimeDrift(string $date) :? int
240			{
241			$now = new \DateTime();
242			$now->format(\DateTime::RFC1123);
243
244			try {
245			$realDate = new DateTime($date);
246			} catch (\Exception $e) {
247			return null;
248			}
249
250			return (int)\abs($now->getTimestamp() - $realDate->getTimestamp());
251			}
252			}
253

ncryptf / ncryptf-php

Authorization::getTimeDrift() A last analyzed 2022-11-30 23:22 UTC

Complexity

Size

Duplication

Importance

Duplication Side-by-Side

Filter issues like

Authorization::getTimeDrift() A
last analyzed 2022-11-30 23:22 UTC