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<?php |
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declare(strict_types = 1); |
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namespace X509\CertificationPath\PathBuilding; |
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use X509\Certificate\Certificate; |
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use X509\Certificate\CertificateBundle; |
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use X509\CertificationPath\CertificationPath; |
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use X509\CertificationPath\Exception\PathBuildingException; |
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/** |
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* Class for resolving certification paths. |
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* |
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* @link https://tools.ietf.org/html/rfc4158 |
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*/ |
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class CertificationPathBuilder |
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{ |
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/** |
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* Trust anchors. |
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* |
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* @var CertificateBundle |
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*/ |
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protected $_trustList; |
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/** |
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* Constructor. |
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* |
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* @param CertificateBundle $trust_list List of trust anchors |
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*/ |
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public function __construct(CertificateBundle $trust_list) |
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{ |
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$this->_trustList = $trust_list; |
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} |
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/** |
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* Get all certification paths to given target certificate from |
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* any trust anchor. |
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* |
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* @param Certificate $target Target certificate |
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* @param CertificateBundle|null $intermediate Optional intermediate |
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* certificates |
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* @return CertificationPath[] |
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*/ |
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public function allPathsToTarget(Certificate $target, |
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CertificateBundle $intermediate = null): array |
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{ |
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$paths = $this->_resolvePathsToTarget($target, $intermediate); |
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// map paths to CertificationPath objects |
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return array_map( |
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function ($certs) { |
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return new CertificationPath(...$certs); |
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}, $paths); |
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} |
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/** |
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* Resolve all possible certification paths from any trust anchor to |
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* the target certificate, using optional intermediate certificates. |
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* |
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* Helper method for allPathsToTarget to be called recursively. |
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* |
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* @todo Implement loop detection |
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* @param Certificate $target |
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* @param CertificateBundle $intermediate |
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* @return array[] Array of arrays containing path certificates |
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*/ |
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private function _resolvePathsToTarget(Certificate $target, |
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CertificateBundle $intermediate = null): array |
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{ |
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// array of possible paths |
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$paths = array(); |
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// signed by certificate in the trust list |
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foreach ($this->_findIssuers($target, $this->_trustList) as $issuer) { |
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// if target is self-signed, path consists of only |
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// the target certificate |
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if ($target->equals($issuer)) { |
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$paths[] = array($target); |
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} else { |
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$paths[] = array($issuer, $target); |
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} |
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} |
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if (isset($intermediate)) { |
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// signed by intermediate certificate |
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foreach ($this->_findIssuers($target, $intermediate) as $issuer) { |
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// intermediate certificate must not be self-signed |
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if ($issuer->isSelfIssued()) { |
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continue; |
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} |
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// resolve paths to issuer |
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$subpaths = $this->_resolvePathsToTarget($issuer, $intermediate); |
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foreach ($subpaths as $path) { |
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$paths[] = array_merge($path, array($target)); |
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} |
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} |
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} |
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return $paths; |
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} |
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/** |
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* Get shortest path to given target certificate from any trust anchor. |
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* |
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* @param Certificate $target Target certificate |
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* @param CertificateBundle|null $intermediate Optional intermediate |
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* certificates |
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* @throws PathBuildingException |
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* @return CertificationPath |
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*/ |
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public function shortestPathToTarget(Certificate $target, |
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CertificateBundle $intermediate = null): CertificationPath |
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{ |
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$paths = $this->allPathsToTarget($target, $intermediate); |
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if (!count($paths)) { |
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throw new PathBuildingException("No certification paths."); |
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} |
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usort($paths, |
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function ($a, $b) { |
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return count($a) < count($b) ? -1 : 1; |
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}); |
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return reset($paths); |
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} |
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/** |
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* Find all issuers of the target certificate from a given bundle. |
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* |
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* @param Certificate $target Target certificate |
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* @param CertificateBundle $bundle Certificates to search |
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* @return Certificate[] |
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*/ |
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protected function _findIssuers(Certificate $target, |
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CertificateBundle $bundle): array |
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{ |
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$issuers = array(); |
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$issuer_name = $target->tbsCertificate()->issuer(); |
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$extensions = $target->tbsCertificate()->extensions(); |
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// find by authority key identifier |
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if ($extensions->hasAuthorityKeyIdentifier()) { |
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$ext = $extensions->authorityKeyIdentifier(); |
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if ($ext->hasKeyIdentifier()) { |
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foreach ($bundle->allBySubjectKeyIdentifier( |
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$ext->keyIdentifier()) as $issuer) { |
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// check that issuer name matches |
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if ($issuer->tbsCertificate() |
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->subject() |
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->equals($issuer_name)) { |
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$issuers[] = $issuer; |
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} |
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} |
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} |
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} |
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return $issuers; |
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} |
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} |
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|
et-nik /
x509
