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<?php |
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declare(strict_types = 1); |
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namespace Sop\X509\AttributeCertificate\Validation; |
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use Sop\CryptoBridge\Crypto; |
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use Sop\X509\AttributeCertificate\AttributeCertificate; |
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use Sop\X509\AttributeCertificate\Validation\Exception\ACValidationException; |
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use Sop\X509\Certificate\Certificate; |
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use Sop\X509\Certificate\Extension\Extension; |
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use Sop\X509\Certificate\Extension\Target\Targets; |
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use Sop\X509\Certificate\Extension\TargetInformationExtension; |
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use Sop\X509\CertificationPath\Exception\PathValidationException; |
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use Sop\X509\CertificationPath\PathValidation\PathValidationConfig; |
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/** |
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* Implements attribute certificate validation conforming to RFC 5755. |
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* |
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* @see https://tools.ietf.org/html/rfc5755#section-5 |
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*/ |
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class ACValidator |
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{ |
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/** |
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* Attribute certificate. |
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* |
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* @var AttributeCertificate |
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*/ |
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protected $_ac; |
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/** |
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* Validation configuration. |
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* |
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* @var ACValidationConfig |
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*/ |
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protected $_config; |
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/** |
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* Crypto engine. |
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* |
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* @var Crypto |
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*/ |
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protected $_crypto; |
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/** |
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* Constructor. |
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* |
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* @param AttributeCertificate $ac Attribute certificate to validate |
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* @param ACValidationConfig $config Validation configuration |
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* @param null|Crypto $crypto Crypto engine, use default if not set |
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*/ |
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public function __construct(AttributeCertificate $ac, |
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ACValidationConfig $config, ?Crypto $crypto = null) |
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{ |
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$this->_ac = $ac; |
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$this->_config = $config; |
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$this->_crypto = $crypto ?? Crypto::getDefault(); |
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} |
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/** |
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* Validate attribute certificate. |
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* |
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* @throws ACValidationException If validation fails |
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* |
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* @return AttributeCertificate Validated AC |
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*/ |
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public function validate(): AttributeCertificate |
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{ |
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$this->_validateHolder(); |
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$issuer = $this->_verifyIssuer(); |
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$this->_validateIssuerProfile($issuer); |
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$this->_validateTime(); |
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$this->_validateTargeting(); |
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return $this->_ac; |
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} |
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/** |
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* Validate AC holder's certification. |
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* |
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* @throws ACValidationException |
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* |
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* @return Certificate Certificate of the AC's holder |
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*/ |
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private function _validateHolder(): Certificate |
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{ |
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$path = $this->_config->holderPath(); |
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$config = PathValidationConfig::defaultConfig() |
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->withMaxLength(count($path)) |
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->withDateTime($this->_config->evaluationTime()); |
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try { |
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$holder = $path->validate($config, $this->_crypto)->certificate(); |
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} catch (PathValidationException $e) { |
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throw new ACValidationException( |
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"Failed to validate holder PKC's certification path.", 0, $e); |
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} |
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if (!$this->_ac->isHeldBy($holder)) { |
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throw new ACValidationException("Name mismatch of AC's holder PKC."); |
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} |
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return $holder; |
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} |
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/** |
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* Verify AC's signature and issuer's certification. |
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* |
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* @throws ACValidationException |
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* |
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* @return Certificate Certificate of the AC's issuer |
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*/ |
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private function _verifyIssuer(): Certificate |
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{ |
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$path = $this->_config->issuerPath(); |
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$config = PathValidationConfig::defaultConfig() |
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->withMaxLength(count($path)) |
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->withDateTime($this->_config->evaluationTime()); |
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try { |
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$issuer = $path->validate($config, $this->_crypto)->certificate(); |
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} catch (PathValidationException $e) { |
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throw new ACValidationException( |
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"Failed to validate issuer PKC's certification path.", 0, $e); |
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} |
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if (!$this->_ac->isIssuedBy($issuer)) { |
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throw new ACValidationException("Name mismatch of AC's issuer PKC."); |
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} |
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$pubkey_info = $issuer->tbsCertificate()->subjectPublicKeyInfo(); |
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if (!$this->_ac->verify($pubkey_info, $this->_crypto)) { |
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throw new ACValidationException('Failed to verify signature.'); |
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} |
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return $issuer; |
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} |
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/** |
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* Validate AC issuer's profile. |
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* |
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* @see https://tools.ietf.org/html/rfc5755#section-4.5 |
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* |
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* @param Certificate $cert |
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* |
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* @throws ACValidationException |
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*/ |
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private function _validateIssuerProfile(Certificate $cert): void |
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{ |
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$exts = $cert->tbsCertificate()->extensions(); |
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if ($exts->hasKeyUsage() && !$exts->keyUsage()->isDigitalSignature()) { |
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throw new ACValidationException( |
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"Issuer PKC's Key Usage extension doesn't permit" . |
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' verification of digital signatures.'); |
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} |
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if ($exts->hasBasicConstraints() && $exts->basicConstraints()->isCA()) { |
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throw new ACValidationException('Issuer PKC must not be a CA.'); |
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} |
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} |
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/** |
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* Validate AC's validity period. |
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* |
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* @throws ACValidationException |
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*/ |
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private function _validateTime(): void |
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{ |
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$t = $this->_config->evaluationTime(); |
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$validity = $this->_ac->acinfo()->validityPeriod(); |
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if ($validity->notBeforeTime()->diff($t)->invert) { |
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throw new ACValidationException('Validity period has not started.'); |
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} |
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if ($t->diff($validity->notAfterTime())->invert) { |
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throw new ACValidationException('Attribute certificate has expired.'); |
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} |
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} |
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/** |
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* Validate AC's target information. |
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* |
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* @throws ACValidationException |
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*/ |
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private function _validateTargeting(): void |
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{ |
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$exts = $this->_ac->acinfo()->extensions(); |
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// if target information extension is not present |
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if (!$exts->has(Extension::OID_TARGET_INFORMATION)) { |
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return; |
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} |
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$ext = $exts->get(Extension::OID_TARGET_INFORMATION); |
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if ($ext instanceof TargetInformationExtension && |
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!$this->_hasMatchingTarget($ext->targets())) { |
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throw new ACValidationException( |
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"Attribute certificate doesn't have a matching target."); |
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} |
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} |
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/** |
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* Check whether validation configuration has matching targets. |
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* |
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* @param Targets $targets Set of eligible targets |
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* |
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* @return bool |
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*/ |
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private function _hasMatchingTarget(Targets $targets): bool |
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{ |
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foreach ($this->_config->targets() as $target) { |
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if ($targets->hasTarget($target)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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} |
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sop /
x509
