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<?php |
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namespace Spatie\CertificateChain; |
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use phpseclib\File\ASN1; |
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use phpseclib\File\X509; |
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use Spatie\CertificateChain\Exceptions\CouldNotCreateCertificate; |
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use Spatie\CertificateChain\Exceptions\CouldNotLoadCertificate; |
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class Certificate |
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{ |
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/** |
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* @param string |
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*/ |
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protected $contents; |
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/** |
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* @param string $inputFile |
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* |
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* @return static |
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*/ |
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public static function loadFromFile(string $inputFile) |
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{ |
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$contents = @file_get_contents($inputFile); |
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if ($contents === false) { |
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throw CouldNotLoadCertificate::cannotGetContents($inputFile); |
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} |
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return new static($contents); |
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} |
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/** |
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* @param string $url |
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* |
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* @return static |
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*/ |
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public static function loadFromUrl(string $url) |
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{ |
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return static::loadFromFile($url); |
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} |
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public function __construct(string $contents) |
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{ |
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$certificate = $contents; |
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// If we are missing the pem certificate header, try to convert it to a pem format first |
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if (! empty($contents) && strpos($contents, '-----BEGIN CERTIFICATE-----') === false) { |
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// Extract from either a PKCS#7 format or DER formatted contents |
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$certificate = self::convertPkcs72Pem($contents) ?? self::convertDer2Pem($contents); |
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} |
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$this->guardAgainstInvalidContents($certificate, $contents); |
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$this->contents = $certificate; |
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} |
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/** |
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* Get the URL of the parent certificate. |
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*/ |
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public function getParentCertificateUrl(): string |
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{ |
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$certProperties = (new X509())->loadX509($this->contents); |
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if (empty($certProperties['tbsCertificate']['extensions'])) { |
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return ''; |
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} |
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foreach ($certProperties['tbsCertificate']['extensions'] as $extension) { |
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if ($extension['extnId'] == 'id-pe-authorityInfoAccess') { |
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foreach ($extension['extnValue'] as $extnValue) { |
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if ($extnValue['accessMethod'] == 'id-ad-caIssuers') { |
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return $extnValue['accessLocation']['uniformResourceIdentifier']; |
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} |
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} |
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} |
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} |
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return ''; |
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} |
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public function fetchParentCertificate(): self |
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{ |
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$url = $this->getParentCertificateUrl(); |
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// Only allow for parent certificates to be read from HTTP and HTTPS URLs to |
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// prevent local file inclusion vulnerabilities |
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$scheme = parse_url($url, PHP_URL_SCHEME); |
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if (! in_array($scheme, ['http', 'https'])) { |
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throw CouldNotLoadCertificate::invalidCertificateUrl($url); |
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} |
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return static::loadFromUrl($url); |
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} |
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public function hasParentInTrustChain(): bool |
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{ |
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return ! $this->getParentCertificateUrl() == ''; |
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} |
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public function getContents(): string |
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{ |
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$x509 = new X509(); |
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return $x509->saveX509($x509->loadX509($this->contents)).PHP_EOL; |
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} |
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protected function guardAgainstInvalidContents(string $content, string $original) |
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{ |
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if (! (new X509())->loadX509($content)) { |
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throw CouldNotCreateCertificate::invalidContent($original); |
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} |
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} |
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protected function convertPkcs72Pem(string $pkcs7) |
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{ |
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$decoded = (new ASN1())->decodeBER($pkcs7); |
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$data = $decoded[0]['content'] ?? []; |
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// Make sure we are dealing with actual data |
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if (empty($data)) { |
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return; |
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} |
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// Make sure this is an PKCS#7 signedData object |
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if ($data[0]['type'] === ASN1::TYPE_OBJECT_IDENTIFIER && $data[0]['content'] === '1.2.840.113549.1.7.2') { |
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// Loop over all the content in the signedData object |
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foreach ($data[1]['content'] as $pkcs7SignedData) { |
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// Find all sequences of data |
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if ($pkcs7SignedData['type'] === ASN1::TYPE_SEQUENCE) { |
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// Extract the sequence identifier if possible |
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$identifier = $pkcs7SignedData['content'][2] ?? ''; |
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// Make sure the sequence is a PKCS#7 data object we are dealing with |
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if ($identifier['type'] === ASN1::TYPE_SEQUENCE && $identifier['content'][0]['content'] === '1.2.840.113549.1.7.1') { |
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// Extract the certificate data |
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$certificate = $pkcs7SignedData['content'][3]; |
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// Extract the raw certificate data from the PKCS#7 string |
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$rawCert = substr($pkcs7, $certificate['start'] + $certificate['headerlength'], $certificate['length'] - $certificate['headerlength']); |
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// Return the PEM encoded certificate |
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return $this->convertDer2Pem($rawCert); |
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} |
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} |
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} |
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} |
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} |
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protected function convertDer2Pem(string $der_data, $type = 'CERTIFICATE'): string |
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{ |
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$pem = chunk_split(base64_encode($der_data), 64, "\n"); |
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return "-----BEGIN {$type}-----\n{$pem}-----END {$type}-----\n"; |
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} |
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} |
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spatie /
ssl-certificate-chain-resolver
