Prototype: Don't Be A CA

src/libraries/Common/src/System/Security/Cryptography/Asn1/PssParamsAsn.manual.cs

@@ -0,0 +1,64 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Formats.Asn1;
+using Internal.Cryptography;
+
+namespace System.Security.Cryptography.Asn1
+{
+    internal partial struct PssParamsAsn
+    {
+        internal RSASignaturePadding GetSignaturePadding(
+            int? digestValueLength = null)
+        {
+            if (TrailerField != 1)
+            {
+                throw new CryptographicException(SR.Cryptography_Pkcs_InvalidSignatureParameters);
+            }
+
+            if (MaskGenAlgorithm.Algorithm != Oids.Mgf1)
+            {
+                throw new CryptographicException(
+                    SR.Cryptography_Pkcs_PssParametersMgfNotSupported,
+                    MaskGenAlgorithm.Algorithm);
+            }
+
+            if (MaskGenAlgorithm.Parameters == null)
+            {
+                throw new CryptographicException(SR.Cryptography_Pkcs_InvalidSignatureParameters);
+            }
+
+            AlgorithmIdentifierAsn mgfParams = AlgorithmIdentifierAsn.Decode(
+                MaskGenAlgorithm.Parameters.Value,
+                AsnEncodingRules.DER);
+
+            if (mgfParams.Algorithm != HashAlgorithm.Algorithm)
+            {
+                throw new CryptographicException(
+                    SR.Format(
+                        SR.Cryptography_Pkcs_PssParametersMgfHashMismatch,
+                        mgfParams.Algorithm,
+                        HashAlgorithm.Algorithm));
+            }
+
+            int saltSize = digestValueLength.GetValueOrDefault();
+
+            if (!digestValueLength.HasValue)
+            {
+                saltSize = Helpers.HashOidToByteLength(HashAlgorithm.Algorithm);
+            }
+
+            if (SaltLength != saltSize)
+            {
+                throw new CryptographicException(
+                    SR.Format(
+                        SR.Cryptography_Pkcs_PssParametersSaltMismatch,
+                        SaltLength,
+                        HashAlgorithm.Algorithm));
+            }
+
+            // When RSASignaturePadding supports custom salt sizes this return will look different.
+            return RSASignaturePadding.Pss;
+        }
+    }
+}

src/libraries/Common/src/System/Security/Cryptography/Asn1Reader/AsnValueReader.cs

@@ -173,14 +173,15 @@ internal AsnValueReader ReadSequence(Asn1Tag? expectedTag = default)
             return new AsnValueReader(content, _ruleSet);
         }
 
-        internal AsnValueReader ReadSetOf(Asn1Tag? expectedTag = default)
+        internal AsnValueReader ReadSetOf(Asn1Tag? expectedTag = default, bool skipSortOrderValidation = false)
         {
             AsnDecoder.ReadSetOf(
                 _span,
                 _ruleSet,
                 out int contentOffset,
                 out int contentLength,
                 out int bytesConsumed,
+                skipSortOrderValidation: skipSortOrderValidation,
                 expectedTag: expectedTag);
 
             ReadOnlySpan<byte> content = _span.Slice(contentOffset, contentLength);

src/libraries/Common/src/System/Security/Cryptography/Helpers.cs

@@ -72,5 +72,19 @@ internal static bool TryCopyToDestination(this ReadOnlySpan<byte> source, Span<b
             bytesWritten = 0;
             return false;
         }
+
+        internal static int HashOidToByteLength(string hashOid)
+        {
+            // This file is compiled in netstandard2.0, can't use the HashSizeInBytes consts.
+            return hashOid switch
+            {
+                Oids.Sha256 => 256 >> 3,
+                Oids.Sha384 => 384 >> 3,
+                Oids.Sha512 => 512 >> 3,
+                Oids.Sha1 => 160 >> 3,
+                Oids.Md5 => 128 >> 3,
+                _ => throw new CryptographicException(SR.Format(SR.Cryptography_UnknownHashAlgorithm, hashOid)),
+            };
+        }
     }
 }

src/libraries/Common/src/System/Security/Cryptography/Oids.Shared.cs

@@ -2,55 +2,58 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Diagnostics;
-using System.Security.Cryptography;
+using System.Formats.Asn1;
 
 namespace System.Security.Cryptography
 {
     internal static partial class Oids
     {
-        private static volatile Oid? _rsaOid;
-        private static volatile Oid? _ecPublicKeyOid;
-        private static volatile Oid? _tripleDesCbcOid;
-        private static volatile Oid? _aes256CbcOid;
-        private static volatile Oid? _secp256r1Oid;
-        private static volatile Oid? _secp384r1Oid;
-        private static volatile Oid? _secp521r1Oid;
-        private static volatile Oid? _sha256Oid;
-        private static volatile Oid? _pkcs7DataOid;
-        private static volatile Oid? _contentTypeOid;
-        private static volatile Oid? _documentDescriptionOid;
-        private static volatile Oid? _documentNameOid;
-        private static volatile Oid? _localKeyIdOid;
-        private static volatile Oid? _messageDigestOid;
-        private static volatile Oid? _signingTimeOid;
-        private static volatile Oid? _pkcs9ExtensionRequestOid;
-        private static volatile Oid? _basicConstraints2Oid;
-        private static volatile Oid? _enhancedKeyUsageOid;
-        private static volatile Oid? _keyUsageOid;
-        private static volatile Oid? _subjectKeyIdentifierOid;
-
-        internal static Oid RsaOid => _rsaOid ??= InitializeOid(Rsa);
-        internal static Oid EcPublicKeyOid => _ecPublicKeyOid ??= InitializeOid(EcPublicKey);
-        internal static Oid TripleDesCbcOid => _tripleDesCbcOid ??= InitializeOid(TripleDesCbc);
-        internal static Oid Aes256CbcOid => _aes256CbcOid ??= InitializeOid(Aes256Cbc);
-        internal static Oid secp256r1Oid => _secp256r1Oid ??= new Oid(secp256r1, nameof(ECCurve.NamedCurves.nistP256));
-        internal static Oid secp384r1Oid => _secp384r1Oid ??= new Oid(secp384r1, nameof(ECCurve.NamedCurves.nistP384));
-        internal static Oid secp521r1Oid => _secp521r1Oid ??= new Oid(secp521r1, nameof(ECCurve.NamedCurves.nistP521));
-        internal static Oid Sha256Oid => _sha256Oid ??= InitializeOid(Sha256);
-
-        internal static Oid Pkcs7DataOid => _pkcs7DataOid ??= InitializeOid(Pkcs7Data);
-        internal static Oid ContentTypeOid => _contentTypeOid ??= InitializeOid(ContentType);
-        internal static Oid DocumentDescriptionOid => _documentDescriptionOid ??= InitializeOid(DocumentDescription);
-        internal static Oid DocumentNameOid => _documentNameOid ??= InitializeOid(DocumentName);
-        internal static Oid LocalKeyIdOid => _localKeyIdOid ??= InitializeOid(LocalKeyId);
-        internal static Oid MessageDigestOid => _messageDigestOid ??= InitializeOid(MessageDigest);
-        internal static Oid SigningTimeOid => _signingTimeOid ??= InitializeOid(SigningTime);
-        internal static Oid Pkcs9ExtensionRequestOid => _pkcs9ExtensionRequestOid ??= InitializeOid(Pkcs9ExtensionRequest);
-
-        internal static Oid BasicConstraints2Oid => _basicConstraints2Oid ??= InitializeOid(BasicConstraints2);
-        internal static Oid EnhancedKeyUsageOid => _enhancedKeyUsageOid ??= InitializeOid(EnhancedKeyUsage);
-        internal static Oid KeyUsageOid => _keyUsageOid ??= InitializeOid(KeyUsage);
-        internal static Oid SubjectKeyIdentifierOid => _subjectKeyIdentifierOid ??= InitializeOid(SubjectKeyIdentifier);
+        private static volatile Oid? s_rsaOid;
+        private static volatile Oid? s_ecPublicKeyOid;
+        private static volatile Oid? s_tripleDesCbcOid;
+        private static volatile Oid? s_aes256CbcOid;
+        private static volatile Oid? s_secp256r1Oid;
+        private static volatile Oid? s_secp384r1Oid;
+        private static volatile Oid? s_secp521r1Oid;
+        private static volatile Oid? s_sha256Oid;
+        private static volatile Oid? s_pkcs7DataOid;
+        private static volatile Oid? s_contentTypeOid;
+        private static volatile Oid? s_documentDescriptionOid;
+        private static volatile Oid? s_documentNameOid;
+        private static volatile Oid? s_localKeyIdOid;
+        private static volatile Oid? s_messageDigestOid;
+        private static volatile Oid? s_signingTimeOid;
+        private static volatile Oid? s_pkcs9ExtensionRequestOid;
+        private static volatile Oid? s_basicConstraints2Oid;
+        private static volatile Oid? s_enhancedKeyUsageOid;
+        private static volatile Oid? s_keyUsageOid;
+        private static volatile Oid? s_subjectKeyIdentifierOid;
+        private static volatile Oid? s_commonNameOid;
+
+        internal static Oid RsaOid => s_rsaOid ??= InitializeOid(Rsa);
+        internal static Oid EcPublicKeyOid => s_ecPublicKeyOid ??= InitializeOid(EcPublicKey);
+        internal static Oid TripleDesCbcOid => s_tripleDesCbcOid ??= InitializeOid(TripleDesCbc);
+        internal static Oid Aes256CbcOid => s_aes256CbcOid ??= InitializeOid(Aes256Cbc);
+        internal static Oid secp256r1Oid => s_secp256r1Oid ??= new Oid(secp256r1, nameof(ECCurve.NamedCurves.nistP256));
+        internal static Oid secp384r1Oid => s_secp384r1Oid ??= new Oid(secp384r1, nameof(ECCurve.NamedCurves.nistP384));
+        internal static Oid secp521r1Oid => s_secp521r1Oid ??= new Oid(secp521r1, nameof(ECCurve.NamedCurves.nistP521));
+        internal static Oid Sha256Oid => s_sha256Oid ??= InitializeOid(Sha256);
+
+        internal static Oid Pkcs7DataOid => s_pkcs7DataOid ??= InitializeOid(Pkcs7Data);
+        internal static Oid ContentTypeOid => s_contentTypeOid ??= InitializeOid(ContentType);
+        internal static Oid DocumentDescriptionOid => s_documentDescriptionOid ??= InitializeOid(DocumentDescription);
+        internal static Oid DocumentNameOid => s_documentNameOid ??= InitializeOid(DocumentName);
+        internal static Oid LocalKeyIdOid => s_localKeyIdOid ??= InitializeOid(LocalKeyId);
+        internal static Oid MessageDigestOid => s_messageDigestOid ??= InitializeOid(MessageDigest);
+        internal static Oid SigningTimeOid => s_signingTimeOid ??= InitializeOid(SigningTime);
+        internal static Oid Pkcs9ExtensionRequestOid => s_pkcs9ExtensionRequestOid ??= InitializeOid(Pkcs9ExtensionRequest);
+
+        internal static Oid BasicConstraints2Oid => s_basicConstraints2Oid ??= InitializeOid(BasicConstraints2);
+        internal static Oid EnhancedKeyUsageOid => s_enhancedKeyUsageOid ??= InitializeOid(EnhancedKeyUsage);
+        internal static Oid KeyUsageOid => s_keyUsageOid ??= InitializeOid(KeyUsage);
+        internal static Oid SubjectKeyIdentifierOid => s_subjectKeyIdentifierOid ??= InitializeOid(SubjectKeyIdentifier);
+
+        internal static Oid CommonNameOid => s_commonNameOid ??= InitializeOid(CommonName);
 
         private static Oid InitializeOid(string oidValue)
         {
@@ -65,5 +68,79 @@ private static Oid InitializeOid(string oidValue)
             return oid;
         }
 
+        internal static Oid GetSharedOrNewOid(ref AsnValueReader asnValueReader)
+        {
+            Oid? ret = GetSharedOrNullOid(ref asnValueReader);
+
+            if (ret is not null)
+            {
+                return ret;
+            }
+
+            string oidValue = asnValueReader.ReadObjectIdentifier();
+            return new Oid(oidValue, null);
+        }
+
+        internal static Oid? GetSharedOrNullOid(ref AsnValueReader asnValueReader, Asn1Tag? expectedTag = null)
+        {
+#if NET
+            Asn1Tag tag = asnValueReader.PeekTag();
+
+            // This isn't a valid OID, so return null and let whatever's going to happen happen.
+            if (tag.IsConstructed)
+            {
+                return null;
+            }
+
+            Asn1Tag expected = expectedTag.GetValueOrDefault(Asn1Tag.ObjectIdentifier);
+
+            Debug.Assert(
+                expected.TagClass != TagClass.Universal ||
+                expected.TagValue == (int)UniversalTagNumber.ObjectIdentifier,
+                $"{nameof(GetSharedOrNullOid)} was called with the wrong Universal class tag: {expectedTag}");
+
+            // Not the tag we're expecting, so don't match.
+            if (!tag.HasSameClassAndValue(expected))
+            {
+                return null;
+            }
+
+            ReadOnlySpan<byte> contentBytes = asnValueReader.PeekContentBytes();
+
+            Oid? ret = contentBytes switch
+            {
+                [0x55, 0x04, 0x03] => CommonNameOid,
+                _ => null,
+            };
+
+            if (ret is not null)
+            {
+                // Move to the next item.
+                asnValueReader.ReadEncodedValue();
+            }
+
+            return ret;
+#else
+            // Cannot use list patterns on older TFMs.
+            return null;
+#endif
+        }
+
+        internal static bool ValueEquals(this Oid oid, Oid? other)
+        {
+            Debug.Assert(oid is not null);
+
+            if (ReferenceEquals(oid, other))
+            {
+                return true;
+            }
+
+            if (other is null)
+            {
+                return false;
+            }
+
+            return oid.Value is not null && oid.Value.Equals(other.Value);
+        }
     }
 }

src/libraries/Common/src/System/Security/Cryptography/Oids.cs

@@ -106,10 +106,12 @@ internal static partial class Oids
         internal const string SubjectAltName = "2.5.29.17";
         internal const string IssuerAltName = "2.5.29.18";
         internal const string BasicConstraints2 = "2.5.29.19";
+        internal const string CrlNumber = "2.5.29.20";
         internal const string CrlDistributionPoints = "2.5.29.31";
         internal const string CertPolicies = "2.5.29.32";
         internal const string AnyCertPolicy = "2.5.29.32.0";
         internal const string CertPolicyMappings = "2.5.29.33";
+        internal const string AuthorityKeyIdentifier = "2.5.29.35";
         internal const string CertPolicyConstraints = "2.5.29.36";
         internal const string EnhancedKeyUsage = "2.5.29.37";
         internal const string InhibitAnyPolicyExtension = "2.5.29.54";

src/libraries/Common/src/System/Security/Cryptography/PemLabels.cs

@@ -13,5 +13,7 @@ internal static class PemLabels
         internal const string EcPrivateKey = "EC PRIVATE KEY";
         internal const string X509Certificate = "CERTIFICATE";
         internal const string Pkcs7Certificate = "PKCS7";
+        internal const string Pkcs10CertificateRequest = "CERTIFICATE REQUEST";
+        internal const string X509CertificateRevocationList = "X509 CRL";
     }
 }