RequestSigner::__construct() - Code Metrics - Inspection of "API break: rewrite PaymentProtocol classes" - Bit-Wasp/bitcoin-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#301)

by thomas

created 2016-05-24 18:13 UTC

RequestSigner::__construct() A

↳ Parent: RequestSigner

Complexity

Conditions	4
Paths	6

Size

Total Lines	17
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	4
eloc	9
nc	6
nop	3
dl	0
loc	17
rs	9.2
c	1
b	0
f	0

<?php

namespace BitWasp\Bitcoin\PaymentProtocol;

use BitWasp\Bitcoin\PaymentProtocol\Protobufs\PaymentRequest as PaymentRequestBuf;
use BitWasp\Bitcoin\PaymentProtocol\Protobufs\X509Certificates as X509CertificatesBuf;

class RequestSigner
{
    const SHA256 = 'x509+sha256';
    const SHA1 = 'x509+sha1';
    const NONE = 'none';
    
    /**
     * @var string
     */
    private $type;

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

    /**
     * @var X509CertificatesBuf
     */
    private $certificates;

    /**
     * @var resource
     */
    private $privateKey;

    /**
     * @param string $type
     * @param string $keyFile
     * @param string $certFile
     * @throws \Exception
     */
    public function __construct($type = null, $keyFile = '', $certFile = '')
    {
        if ($type === null) {
            $type = self::NONE;
        }
        
        if (false === in_array($type, [self::NONE, self::SHA1, self::SHA256], true)) {
            throw new \InvalidArgumentException('Invalid BIP70 signature type');
        }

        $this->type = $type;
        $this->certificates = new X509CertificatesBuf();

        if ($type !== self::NONE) {
            $this->initialize($keyFile, $certFile);
        }
    }

    /**
     * @return RequestSigner
     */
    public static function none()
    {
        return new self(self::NONE);
    }

    /**
     * @param string $keyFile
     * @param string $certFile
     * @return RequestSigner
     */
    public static function sha1($keyFile, $certFile)
    {
        return new self(self::SHA1, $keyFile, $certFile);
    }

    /**
     * @param string $keyFile
     * @param string $certFile
     * @return RequestSigner
     */
    public static function sha256($keyFile, $certFile)
    {
        return new self(self::SHA256, $keyFile, $certFile);
    }

    /**
     * @return bool
     */
    public function supportsSha256()
    {
        return defined('OPENSSL_ALGO_SHA256');
    }

    /**
     * @param string $keyFile - path to key file
     * @param string $certFile - path to certificate chain file
     * @throws \Exception
     */
    private function initialize($keyFile, $certFile)
    {
        if (false === file_exists($keyFile)) {
            throw new \InvalidArgumentException('Private key file does not exist');
        }

        if (false === file_exists($certFile)) {
            throw new \InvalidArgumentException('Certificate file does not exist');
        }

        if (self::SHA256 === $this->type && !$this->supportsSha256()) {
            throw new \Exception('Server does not support x.509+SHA256');
        }

        $chain = $this->fetchChain($certFile);
        if (!is_array($chain) || count($chain) === 0) {
            throw new \RuntimeException('Certificate file contains no certificates');
        }

        foreach ($chain as $cert) {
            $this->certificates->addCertificate($cert);
        }

        $pkeyid = openssl_get_privatekey(file_get_contents($keyFile));
        if (false === $pkeyid) {
            throw new \InvalidArgumentException('Private key is invalid');
        }

        $this->privateKey = $pkeyid;
        $this->algoConst = $this->type === self::SHA256
            ? OPENSSL_ALGO_SHA256
            : OPENSSL_ALGO_SHA1;
    }

    /**
     * @param string $data
     * @return string
     * @throws \Exception
     */
    private function signData($data)
    {
        if ($this->type === self::NONE) {
            throw new \RuntimeException('signData called when Signer is not configured for signatures');
        }

        $signature = '';
        if (!openssl_sign($data, $signature, $this->privateKey, $this->algoConst)) {
            throw new \Exception('PaymentRequestSigner: Unable to create signature');
        }

        return $signature;
    }

    /**
     * Applies the configured signature algorithm, adding values to
     * the protobuf: 'pkiType', 'signature', 'pkiData'
     *
     * @param PaymentRequestBuf $request
     * @return PaymentRequestBuf
     * @throws \Exception
     */
    public function sign(PaymentRequestBuf $request)
    {
        $request->setPkiType($this->type);
        $request->setSignature('');

        if ($this->type !== self::NONE) {
            // PkiData must be captured in signature, and signature must be empty!
            $request->setPkiData($this->certificates->serialize());
            $signature = $this->signData($request->serialize());
            $request->setSignature($signature);
        }

        return $request;
    }

    /**
     * @param PaymentRequestBuf $request
     * @return bool
     */
    public function verify(PaymentRequestBuf $request)
    {
        $type = $request->getPkiType();
        if ($type === RequestSigner::NONE) {
<?php

class Certificate {
    const TRIPLEDES_CBC = 'ASDFGHJKL';

    private $key;

    public function __construct()
    {
        $this->key = Certificate::TRIPLEDES_CBC;
    }
}
            return true;
        }

        if ($type === RequestSigner::SHA256) {
<?php

class Certificate {
    const TRIPLEDES_CBC = 'ASDFGHJKL';

    private $key;

    public function __construct()
    {
        $this->key = Certificate::TRIPLEDES_CBC;
    }
}
            $algorithm = OPENSSL_ALGO_SHA256;
        } else if ($type === RequestSigner::SHA1) {
<?php

class Certificate {
    const TRIPLEDES_CBC = 'ASDFGHJKL';

    private $key;

    public function __construct()
    {
        $this->key = Certificate::TRIPLEDES_CBC;
    }
}
            $algorithm = OPENSSL_ALGO_SHA1;
        } else {
            throw new \RuntimeException('Unsupported signature algorithm');
        }

        $clone = clone $request;
        $clone->setSignature('');
        $data = $clone->serialize();

        // Parse the public key
        $certificates = new X509CertificatesBuf();
        $certificates->parse($clone->getPkiData());
        $certificate = $this->der2pem($certificates->getCertificate(0));
        $pubkeyid = openssl_pkey_get_public($certificate);

        return 1 === openssl_verify($data, $request->getSignature(), $pubkeyid, $algorithm);
    }

    /**
     * Checks whether the decoded certificate is a root / self-signed certificate
     * @param array $certificate
     * @return bool
     */
    private function isRoot($certificate)
    {
        return $certificate['issuer'] === $certificate['subject'];
    }

    /**
     * Fetches parent certificates using network requests
     * Todo: review use of file_get_contents
     * @param $leafCertificate
     * @return false|string
     */
    private function fetchCertificateParent($leafCertificate)
    {
        $pattern = '/CA Issuers - URI:(\\S*)/';
        $matches = array();

        $nMatches = preg_match_all($pattern, $leafCertificate['extensions']['authorityInfoAccess'], $matches);
        if ($nMatches === 0) {
            return false;
        }
        foreach ($matches[1] as $url) {
            $parentCert = file_get_contents($url);
            if ($parentCert && $this->parseCertificate($parentCert)) {
                return $parentCert;
            }
        }

        return false;
    }

    /**
     * Parses a PEM or DER certificate
     * @param string $certData
     * @return array
     */
    private function parseCertificate($certData)
    {
        $begin = '-----BEGIN CERTIFICATE-----';
        $end = '-----END CERTIFICATE-----';

        if (strpos($certData, $begin) !== false) {
            return openssl_x509_parse($certData);
        }
        $d = $begin . "\n";
        $d .= chunk_split(base64_encode($certData));
        $d .= $end . "\n";
        return openssl_x509_parse($d);
    }

    /**
     * @param $certData
     * @return array
     */
    private function der2pem($certData)
    {
        $begin = '-----BEGIN CERTIFICATE-----';
        $end = '-----END CERTIFICATE-----';

        $d = $begin . "\n";
        $d .= chunk_split(base64_encode($certData));
        $d .= $end . "\n";
        return $d;
    }

    /**
     * Decode PEM data, return the internal DER data
     * @param string $pem_data - pem certificate data
     * @return string
     */
    private function pem2der($pem_data)
    {
        $begin = 'CERTIFICATE-----';
        $end = '-----END';
        if (strpos($pem_data, $begin) === false) {
            return $pem_data;
        }
        $pem_data = substr($pem_data, strpos($pem_data, $begin) + strlen($begin));
        $pem_data = substr($pem_data, 0, strpos($pem_data, $end));
        $der = base64_decode($pem_data);
        return $der;
    }

    /**
     * @param string $leaf - path to a file with certificates
     * @return array|bool
     */
    private function fetchChain($leaf)
    {
        $result = array();
        $leaf = file_get_contents($leaf);
        $cert = $this->parseCertificate($leaf);
        if ($cert === false) {
            return false;
        }

        $certData = self::pem2der($leaf);
        $result[] = $certData;
        while ($cert) {

            $result[] = $certData;
            // Only break after adding Cert Data - allows for self-signed certificates
            if ($this->isRoot($cert)) {
                break;
            }
            $certData = $this->fetchCertificateParent($cert);
            $cert = $this->parseCertificate($certData);
<?php

function getDate($date)
{
    if ($date !== null) {
        return new DateTime($date);
    }

    return false;
}
        }

        return $result;
    }
}


1			<?php
2
3			namespace BitWasp\Bitcoin\PaymentProtocol;
4
5			use BitWasp\Bitcoin\PaymentProtocol\Protobufs\PaymentRequest as PaymentRequestBuf;
6			use BitWasp\Bitcoin\PaymentProtocol\Protobufs\X509Certificates as X509CertificatesBuf;
7
8			class RequestSigner
9			{
10			const SHA256 = 'x509+sha256';
11			const SHA1 = 'x509+sha1';
12			const NONE = 'none';
13
14			/**
15			* @var string
16			*/
17			private $type;
18
19			/**
20			* @var int
21			*/
22			private $algoConst;
23
24			/**
25			* @var X509CertificatesBuf
26			*/
27			private $certificates;
28
29			/**
30			* @var resource
31			*/
32			private $privateKey;
33
34			/**
35			* @param string $type
36			* @param string $keyFile
37			* @param string $certFile
38			* @throws \Exception
39			*/
40			public function __construct($type = null, $keyFile = '', $certFile = '')
41			{
42			if ($type === null) {
43			$type = self::NONE;
44			}
45
46			if (false === in_array($type, [self::NONE, self::SHA1, self::SHA256], true)) {
47			throw new \InvalidArgumentException('Invalid BIP70 signature type');
48			}
49
50			$this->type = $type;
51			$this->certificates = new X509CertificatesBuf();
52
53			if ($type !== self::NONE) {
54			$this->initialize($keyFile, $certFile);
55			}
56			}
57
58			/**
59			* @return RequestSigner
60			*/
61			public static function none()
62			{
63			return new self(self::NONE);
64			}
65
66			/**
67			* @param string $keyFile
68			* @param string $certFile
69			* @return RequestSigner
70			*/
71			public static function sha1($keyFile, $certFile)
72			{
73			return new self(self::SHA1, $keyFile, $certFile);
74			}
75
76			/**
77			* @param string $keyFile
78			* @param string $certFile
79			* @return RequestSigner
80			*/
81			public static function sha256($keyFile, $certFile)
82			{
83			return new self(self::SHA256, $keyFile, $certFile);
84			}
85
86			/**
87			* @return bool
88			*/
89			public function supportsSha256()
90			{
91			return defined('OPENSSL_ALGO_SHA256');
92			}
93
94			/**
95			* @param string $keyFile - path to key file
96			* @param string $certFile - path to certificate chain file
97			* @throws \Exception
98			*/
99			private function initialize($keyFile, $certFile)
100			{
101			if (false === file_exists($keyFile)) {
102			throw new \InvalidArgumentException('Private key file does not exist');
103			}
104
105			if (false === file_exists($certFile)) {
106			throw new \InvalidArgumentException('Certificate file does not exist');
107			}
108
109			if (self::SHA256 === $this->type && !$this->supportsSha256()) {
110			throw new \Exception('Server does not support x.509+SHA256');
111			}
112
113			$chain = $this->fetchChain($certFile);
114			if (!is_array($chain) \|\| count($chain) === 0) {
115			throw new \RuntimeException('Certificate file contains no certificates');
116			}
117
118			foreach ($chain as $cert) {
119			$this->certificates->addCertificate($cert);
120			}
121
122			$pkeyid = openssl_get_privatekey(file_get_contents($keyFile));
123			if (false === $pkeyid) {
124			throw new \InvalidArgumentException('Private key is invalid');
125			}
126
127			$this->privateKey = $pkeyid;
128			$this->algoConst = $this->type === self::SHA256
129			? OPENSSL_ALGO_SHA256
130			: OPENSSL_ALGO_SHA1;
131			}
132
133			/**
134			* @param string $data
135			* @return string
136			* @throws \Exception
137			*/
138			private function signData($data)
139			{
140			if ($this->type === self::NONE) {
141			throw new \RuntimeException('signData called when Signer is not configured for signatures');
142			}
143
144			$signature = '';
145			if (!openssl_sign($data, $signature, $this->privateKey, $this->algoConst)) {
146			throw new \Exception('PaymentRequestSigner: Unable to create signature');
147			}
148
149			return $signature;
150			}
151
152			/**
153			* Applies the configured signature algorithm, adding values to
154			* the protobuf: 'pkiType', 'signature', 'pkiData'
155			*
156			* @param PaymentRequestBuf $request
157			* @return PaymentRequestBuf
158			* @throws \Exception
159			*/
160			public function sign(PaymentRequestBuf $request)
161			{
162			$request->setPkiType($this->type);
163			$request->setSignature('');
164
165			if ($this->type !== self::NONE) {
166			// PkiData must be captured in signature, and signature must be empty!
167			$request->setPkiData($this->certificates->serialize());
168			$signature = $this->signData($request->serialize());
169			$request->setSignature($signature);
170			}
171
172			return $request;
173			}
174
175			/**
176			* @param PaymentRequestBuf $request
177			* @return bool
178			*/
179			public function verify(PaymentRequestBuf $request)
180			{
181			$type = $request->getPkiType();
182			if ($type === RequestSigner::NONE) {
			0 ignored issues – show Coding Style introduced 2016-05-24 19:25 UTC by Report Bug Copy Issue Report As per coding style, `self` should be used for accessing local static members. This check looks for accesses to local static members using the fully qualified name instead of `self::`. <?php class Certificate { const TRIPLEDES_CBC = 'ASDFGHJKL'; private $key; public function __construct() { $this->key = Certificate::TRIPLEDES_CBC; } } While this is perfectly valid, the fully qualified name of `Certificate::TRIPLEDES_CBC` could just as well be replaced by `self::TRIPLEDES_CBC`. Referencing local members with `self::` assured the access will still work when the class is renamed, makes it perfectly clear that the member is in fact local and will usually be shorter. Loading history...
183			return true;
184			}
185
186			if ($type === RequestSigner::SHA256) {
			0 ignored issues – show Coding Style introduced 2016-05-24 19:25 UTC by Report Bug Copy Issue Report As per coding style, `self` should be used for accessing local static members. This check looks for accesses to local static members using the fully qualified name instead of `self::`. <?php class Certificate { const TRIPLEDES_CBC = 'ASDFGHJKL'; private $key; public function __construct() { $this->key = Certificate::TRIPLEDES_CBC; } } While this is perfectly valid, the fully qualified name of `Certificate::TRIPLEDES_CBC` could just as well be replaced by `self::TRIPLEDES_CBC`. Referencing local members with `self::` assured the access will still work when the class is renamed, makes it perfectly clear that the member is in fact local and will usually be shorter. Loading history...
187			$algorithm = OPENSSL_ALGO_SHA256;
188			} else if ($type === RequestSigner::SHA1) {
			0 ignored issues – show Coding Style introduced 2016-05-24 19:25 UTC by Report Bug Copy Issue Report As per coding style, `self` should be used for accessing local static members. This check looks for accesses to local static members using the fully qualified name instead of `self::`. <?php class Certificate { const TRIPLEDES_CBC = 'ASDFGHJKL'; private $key; public function __construct() { $this->key = Certificate::TRIPLEDES_CBC; } } While this is perfectly valid, the fully qualified name of `Certificate::TRIPLEDES_CBC` could just as well be replaced by `self::TRIPLEDES_CBC`. Referencing local members with `self::` assured the access will still work when the class is renamed, makes it perfectly clear that the member is in fact local and will usually be shorter. Loading history...
189			$algorithm = OPENSSL_ALGO_SHA1;
190			} else {
191			throw new \RuntimeException('Unsupported signature algorithm');
192			}
193
194			$clone = clone $request;
195			$clone->setSignature('');
196			$data = $clone->serialize();
197
198			// Parse the public key
199			$certificates = new X509CertificatesBuf();
200			$certificates->parse($clone->getPkiData());
201			$certificate = $this->der2pem($certificates->getCertificate(0));
202			$pubkeyid = openssl_pkey_get_public($certificate);
203
204			return 1 === openssl_verify($data, $request->getSignature(), $pubkeyid, $algorithm);
205			}
206
207			/**
208			* Checks whether the decoded certificate is a root / self-signed certificate
209			* @param array $certificate
210			* @return bool
211			*/
212			private function isRoot($certificate)
213			{
214			return $certificate['issuer'] === $certificate['subject'];
215			}
216
217			/**
218			* Fetches parent certificates using network requests
219			* Todo: review use of file_get_contents
220			* @param $leafCertificate
221			* @return false\|string
222			*/
223			private function fetchCertificateParent($leafCertificate)
224			{
225			$pattern = '/CA Issuers - URI:(\\S*)/';
226			$matches = array();
227
228			$nMatches = preg_match_all($pattern, $leafCertificate['extensions']['authorityInfoAccess'], $matches);
229			if ($nMatches === 0) {
230			return false;
231			}
232			foreach ($matches[1] as $url) {
233			$parentCert = file_get_contents($url);
234			if ($parentCert && $this->parseCertificate($parentCert)) {
235			return $parentCert;
236			}
237			}
238
239			return false;
240			}
241
242			/**
243			* Parses a PEM or DER certificate
244			* @param string $certData
245			* @return array
246			*/
247			private function parseCertificate($certData)
248			{
249			$begin = '-----BEGIN CERTIFICATE-----';
250			$end = '-----END CERTIFICATE-----';
251
252			if (strpos($certData, $begin) !== false) {
253			return openssl_x509_parse($certData);
254			}
255			$d = $begin . "\n";
256			$d .= chunk_split(base64_encode($certData));
257			$d .= $end . "\n";
258			return openssl_x509_parse($d);
259			}
260
261			/**
262			* @param $certData
263			* @return array
264			*/
265			private function der2pem($certData)
266			{
267			$begin = '-----BEGIN CERTIFICATE-----';
268			$end = '-----END CERTIFICATE-----';
269
270			$d = $begin . "\n";
271			$d .= chunk_split(base64_encode($certData));
272			$d .= $end . "\n";
273			return $d;
274			}
275
276			/**
277			* Decode PEM data, return the internal DER data
278			* @param string $pem_data - pem certificate data
279			* @return string
280			*/
281			private function pem2der($pem_data)
282			{
283			$begin = 'CERTIFICATE-----';
284			$end = '-----END';
285			if (strpos($pem_data, $begin) === false) {
286			return $pem_data;
287			}
288			$pem_data = substr($pem_data, strpos($pem_data, $begin) + strlen($begin));
289			$pem_data = substr($pem_data, 0, strpos($pem_data, $end));
290			$der = base64_decode($pem_data);
291			return $der;
292			}
293
294			/**
295			* @param string $leaf - path to a file with certificates
296			* @return array\|bool
297			*/
298			private function fetchChain($leaf)
299			{
300			$result = array();
301			$leaf = file_get_contents($leaf);
302			$cert = $this->parseCertificate($leaf);
303			if ($cert === false) {
304			return false;
305			}
306
307			$certData = self::pem2der($leaf);
308			$result[] = $certData;
309			while ($cert) {
			0 ignored issues – show Bug Best Practice introduced 2016-05-24 19:25 UTC by Report Bug Copy Issue Report The expression `$cert` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `! empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
310			$result[] = $certData;
311			// Only break after adding Cert Data - allows for self-signed certificates
312			if ($this->isRoot($cert)) {
313			break;
314			}
315			$certData = $this->fetchCertificateParent($cert);
316			$cert = $this->parseCertificate($certData);
			0 ignored issues – show Security Bug introduced 2016-05-24 19:25 UTC by Report Bug Copy Issue Report It seems like `$certData` defined by `$this->fetchCertificateParent($cert)` on line `315` can also be of type `false`; however, `BitWasp\Bitcoin\PaymentP...ner::parseCertificate()` does only seem to accept `string`, did you maybe forget to handle an error condition? This check looks for type mismatches where the missing type is `false`. This is usually indicative of an error condtion. Consider the follow example <?php function getDate($date) { if ($date !== null) { return new DateTime($date); } return false; } This function either returns a new `DateTime` object or false, if there was an error. This is a typical pattern in PHP programming to show that an error has occurred without raising an exception. The calling code should check for this returned `false` before passing on the value to another function or method that may not be able to handle a `false`. Loading history...
317			}
318
319			return $result;
320			}
321			}
322

Bit-Wasp / bitcoin-php

Pull Request — master (#301)

RequestSigner::__construct() A

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