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<?php
declare(strict_types=1);
namespace SpomkyLabs\Pki\X509\Certificate\Extension;
use function array_key_exists;
use SpomkyLabs\Pki\ASN1\Element;
use SpomkyLabs\Pki\ASN1\Type\Constructed\Sequence;
use SpomkyLabs\Pki\ASN1\Type\Primitive\Boolean;
use SpomkyLabs\Pki\ASN1\Type\Primitive\ObjectIdentifier;
use SpomkyLabs\Pki\ASN1\Type\Primitive\OctetString;
use Stringable;
/**
* Base class for certificate extensions.
*
* @see https://tools.ietf.org/html/rfc5280#section-4.2
* @see https://tools.ietf.org/html/rfc5280#section-4.1
*/
abstract class Extension implements Stringable
{
// OID's from standard certificate extensions
public const OID_OBSOLETE_AUTHORITY_KEY_IDENTIFIER = '2.5.29.1';
public const OID_OBSOLETE_KEY_ATTRIBUTES = '2.5.29.2';
public const OID_OBSOLETE_CERTIFICATE_POLICIES = '2.5.29.3';
public const OID_OBSOLETE_KEY_USAGE_RESTRICTION = '2.5.29.4';
public const OID_OBSOLETE_POLICY_MAPPING = '2.5.29.5';
public const OID_OBSOLETE_SUBTREES_CONSTRAINT = '2.5.29.6';
public const OID_OBSOLETE_SUBJECT_ALT_NAME = '2.5.29.7';
public const OID_OBSOLETE_ISSUER_ALT_NAME = '2.5.29.8';
public const OID_SUBJECT_DIRECTORY_ATTRIBUTES = '2.5.29.9';
public const OID_OBSOLETE_BASIC_CONSTRAINTS = '2.5.29.10';
public const OID_SUBJECT_KEY_IDENTIFIER = '2.5.29.14';
public const OID_KEY_USAGE = '2.5.29.15';
public const OID_PRIVATE_KEY_USAGE_PERIOD = '2.5.29.16';
public const OID_SUBJECT_ALT_NAME = '2.5.29.17';
public const OID_ISSUER_ALT_NAME = '2.5.29.18';
public const OID_BASIC_CONSTRAINTS = '2.5.29.19';
public const OID_CRL_NUMBER = '2.5.29.20';
public const OID_REASON_CODE = '2.5.29.21';
public const OID_OBSOLETE_EXPIRATION_DATE = '2.5.29.22';
public const OID_INSTRUCTION_CODE = '2.5.29.23';
public const OID_INVALIDITY_DATE = '2.5.29.24';
public const OID_OBSOLETE_CRL_DISTRIBUTION_POINTS = '2.5.29.25';
public const OID_OBSOLETE_ISSUING_DISTRIBUTION_POINT = '2.5.29.26';
public const OID_DELTA_CRL_INDICATOR = '2.5.29.27';
public const OID_ISSUING_DISTRIBUTION_POINT = '2.5.29.28';
public const OID_CERTIFICATE_ISSUER = '2.5.29.29';
public const OID_NAME_CONSTRAINTS = '2.5.29.30';
public const OID_CRL_DISTRIBUTION_POINTS = '2.5.29.31';
public const OID_CERTIFICATE_POLICIES = '2.5.29.32';
public const OID_POLICY_MAPPINGS = '2.5.29.33';
public const OID_OBSOLETE_POLICY_CONSTRAINTS = '2.5.29.34';
public const OID_AUTHORITY_KEY_IDENTIFIER = '2.5.29.35';
public const OID_POLICY_CONSTRAINTS = '2.5.29.36';
public const OID_EXT_KEY_USAGE = '2.5.29.37';
public const OID_AUTHORITY_ATTRIBUTE_IDENTIFIER = '2.5.29.38';
public const OID_ROLE_SPEC_CERT_IDENTIFIER = '2.5.29.39';
public const OID_CRL_STREAM_IDENTIFIER = '2.5.29.40';
public const OID_BASIC_ATT_CONSTRAINTS = '2.5.29.41';
public const OID_DELEGATED_NAME_CONSTRAINTS = '2.5.29.42';
public const OID_TIME_SPECIFICATION = '2.5.29.43';
public const OID_CRL_SCOPE = '2.5.29.44';
public const OID_STATUS_REFERRALS = '2.5.29.45';
public const OID_FRESHEST_CRL = '2.5.29.46';
public const OID_ORDERED_LIST = '2.5.29.47';
public const OID_ATTRIBUTE_DESCRIPTOR = '2.5.29.48';
public const OID_USER_NOTICE = '2.5.29.49';
public const OID_SOA_IDENTIFIER = '2.5.29.50';
public const OID_BASE_UPDATE_TIME = '2.5.29.51';
public const OID_ACCEPTABLE_CERT_POLICIES = '2.5.29.52';
public const OID_DELTA_INFO = '2.5.29.53';
public const OID_INHIBIT_ANY_POLICY = '2.5.29.54';
public const OID_TARGET_INFORMATION = '2.5.29.55';
public const OID_NO_REV_AVAIL = '2.5.29.56';
public const OID_ACCEPTABLE_PRIVILEGE_POLICIES = '2.5.29.57';
public const OID_TO_BE_REVOKED = '2.5.29.58';
public const OID_REVOKED_GROUPS = '2.5.29.59';
public const OID_EXPIRED_CERTS_ON_CRL = '2.5.29.60';
public const OID_INDIRECT_ISSUER = '2.5.29.61';
public const OID_NO_ASSERTION = '2.5.29.62';
public const OID_AA_ISSUING_DISTRIBUTION_POINT = '2.5.29.63';
public const OID_ISSUED_ON_BEHALF_OF = '2.5.29.64';
public const OID_SINGLE_USE = '2.5.29.65';
public const OID_GROUP_AC = '2.5.29.66';
public const OID_ALLOWED_ATT_ASS = '2.5.29.67';
public const OID_ATTRIBUTE_MAPPINGS = '2.5.29.68';
public const OID_HOLDER_NAME_CONSTRAINTS = '2.5.29.69';
// OID's from private certificate extensions arc
public const OID_AUTHORITY_INFORMATION_ACCESS = '1.3.6.1.5.5.7.1.1';
public const OID_AA_CONTROLS = '1.3.6.1.5.5.7.1.6';
public const OID_SUBJECT_INFORMATION_ACCESS = '1.3.6.1.5.5.7.1.11';
public const OID_LOGOTYPE = '1.3.6.1.5.5.7.1.12';
/**
* Mapping from extension ID to implementation class name.
*
* @internal
*
* @var array<string, string>
*/
private const MAP_OID_TO_CLASS = [
self::OID_AUTHORITY_KEY_IDENTIFIER => AuthorityKeyIdentifierExtension::class,
self::OID_SUBJECT_KEY_IDENTIFIER => SubjectKeyIdentifierExtension::class,
self::OID_KEY_USAGE => KeyUsageExtension::class,
self::OID_CERTIFICATE_POLICIES => CertificatePoliciesExtension::class,
self::OID_POLICY_MAPPINGS => PolicyMappingsExtension::class,
self::OID_SUBJECT_ALT_NAME => SubjectAlternativeNameExtension::class,
self::OID_ISSUER_ALT_NAME => IssuerAlternativeNameExtension::class,
self::OID_SUBJECT_DIRECTORY_ATTRIBUTES => SubjectDirectoryAttributesExtension::class,
self::OID_BASIC_CONSTRAINTS => BasicConstraintsExtension::class,
self::OID_NAME_CONSTRAINTS => NameConstraintsExtension::class,
self::OID_POLICY_CONSTRAINTS => PolicyConstraintsExtension::class,
self::OID_EXT_KEY_USAGE => ExtendedKeyUsageExtension::class,
self::OID_CRL_DISTRIBUTION_POINTS => CRLDistributionPointsExtension::class,
self::OID_INHIBIT_ANY_POLICY => InhibitAnyPolicyExtension::class,
self::OID_FRESHEST_CRL => FreshestCRLExtension::class,
self::OID_NO_REV_AVAIL => NoRevocationAvailableExtension::class,
self::OID_TARGET_INFORMATION => TargetInformationExtension::class,
self::OID_AUTHORITY_INFORMATION_ACCESS => AuthorityInformationAccessExtension::class,
self::OID_AA_CONTROLS => AAControlsExtension::class,
self::OID_SUBJECT_INFORMATION_ACCESS => SubjectInformationAccessExtension::class,
];
/**
* Mapping from extensions ID to short name.
*
* @internal
*
* @var array<string, string>
*/
private const MAP_OID_TO_NAME = [
self::OID_AUTHORITY_KEY_IDENTIFIER => 'authorityKeyIdentifier',
self::OID_SUBJECT_KEY_IDENTIFIER => 'subjectKeyIdentifier',
self::OID_KEY_USAGE => 'keyUsage',
self::OID_PRIVATE_KEY_USAGE_PERIOD => 'privateKeyUsagePeriod',
self::OID_CERTIFICATE_POLICIES => 'certificatePolicies',
self::OID_POLICY_MAPPINGS => 'policyMappings',
self::OID_SUBJECT_ALT_NAME => 'subjectAltName',
self::OID_ISSUER_ALT_NAME => 'issuerAltName',
self::OID_SUBJECT_DIRECTORY_ATTRIBUTES => 'subjectDirectoryAttributes',
self::OID_BASIC_CONSTRAINTS => 'basicConstraints',
self::OID_NAME_CONSTRAINTS => 'nameConstraints',
self::OID_POLICY_CONSTRAINTS => 'policyConstraints',
self::OID_EXT_KEY_USAGE => 'extKeyUsage',
self::OID_CRL_DISTRIBUTION_POINTS => 'cRLDistributionPoints',
self::OID_INHIBIT_ANY_POLICY => 'inhibitAnyPolicy',
self::OID_FRESHEST_CRL => 'freshestCRL',
self::OID_NO_REV_AVAIL => 'noRevAvail',
self::OID_TARGET_INFORMATION => 'targetInformation',
self::OID_AUTHORITY_INFORMATION_ACCESS => 'authorityInfoAccess',
self::OID_AA_CONTROLS => 'aaControls',
self::OID_SUBJECT_INFORMATION_ACCESS => 'subjectInfoAccess',
self::OID_LOGOTYPE => 'logotype',
];
/**
* @param string $oid Extension OID
* @param bool $critical Whether extension is critical
*/
protected function __construct(
private readonly string $oid,
private readonly bool $critical
) {
}
public function __toString(): string
{
return $this->extensionName();
}
/**
* Initialize from ASN.1.
*/
public static function fromASN1(Sequence $seq): self
{
$idx = 0;
$extnID = $seq->at($idx++)
->asObjectIdentifier()
->oid();
$critical = false;
if ($seq->has($idx, Element::TYPE_BOOLEAN)) {
$critical = $seq->at($idx++)
->asBoolean()
->value();
}
$data = $seq->at($idx)
->asOctetString()
->string();
if (array_key_exists($extnID, self::MAP_OID_TO_CLASS)) {
$cls = self::MAP_OID_TO_CLASS[$extnID];
return $cls::fromDER($data, $critical);
}
return UnknownExtension::fromRawString($extnID, $critical, $data);
}
/**
* Get extension OID.
*/
public function oid(): string
{
return $this->oid;
}
/**
* Check whether extension is critical.
*/
public function isCritical(): bool
{
return $this->critical;
}
/**
* Generate ASN.1 structure.
*/
public function toASN1(): Sequence
{
$elements = [ObjectIdentifier::create($this->oid)];
if ($this->critical) {
$elements[] = Boolean::create(true);
}
$elements[] = $this->extnValue();
return Sequence::create(...$elements);
}
/**
* Get short name of the extension.
*/
public function extensionName(): string
{
if (array_key_exists($this->oid, self::MAP_OID_TO_NAME)) {
return self::MAP_OID_TO_NAME[$this->oid];
}
return $this->oid();
}
/**
* Get ASN.1 structure of the extension value.
*/
abstract protected function valueASN1(): Element;
/**
* Parse extension value from DER.
*
* @param string $data DER data
* @param bool $critical Whether extension is critical
*/
abstract protected static function fromDER(string $data, bool $critical): static;
/**
* Get the extnValue element.
*/
protected function extnValue(): OctetString
{
return OctetString::create($this->valueASN1()->toDER());
}
}