Handle additional X509 chain statuses for macOS

src/libraries/Native/Unix/System.Security.Cryptography.Native.Apple/pal_x509chain.c

@@ -168,7 +168,8 @@ static void MergeStatusCodes(CFTypeRef key, CFTypeRef value, void* context)
         *pStatus |= PAL_X509ChainUntrustedRoot;
     else if (CFEqual(keyString, CFSTR("BasicConstraints")))
         *pStatus |= PAL_X509ChainInvalidBasicConstraints;
-    else if (CFEqual(keyString, CFSTR("UsageConstraints")))
+    else if (CFEqual(keyString, CFSTR("UsageConstraints")) || CFEqual(keyString, CFSTR("BlackListedLeaf")) ||
+             CFEqual(keyString, CFSTR("BlackListedKey")))
         *pStatus |= PAL_X509ChainExplicitDistrust;
     else if (CFEqual(keyString, CFSTR("RevocationResponseRequired")))
         *pStatus |= PAL_X509ChainRevocationStatusUnknown;

src/libraries/System.Security.Cryptography.X509Certificates/tests/ChainTests.cs

@@ -1063,6 +1063,131 @@ void CheckChain()
             }
         }
 
+        [Fact]
+        [PlatformSpecific(~TestPlatforms.Linux)]
+        public static void BuildChainForFraudulentCertificate()
+        {
+            byte[] certBytes = Convert.FromBase64String(@"
+MIIF7jCCBNagAwIBAgIQBH7L6fylX3vQnq424QyuHjANBgkqhkiG9w0BAQUFADCB
+lzELMAkGA1UEBhMCVVMxCzAJBgNVBAgTAlVUMRcwFQYDVQQHEw5TYWx0IExha2Ug
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+mLgOGT78BTHjFtn9kAUDhsZXAR9/eKDPM2qqZmsi0KdJIw==");
+
+            using (X509Certificate2 cert = new X509Certificate2(certBytes))
+            using (ChainHolder chainHolder = new ChainHolder())
+            {
+                X509Chain chain = chainHolder.Chain;
+                chain.ChainPolicy.RevocationMode = X509RevocationMode.NoCheck;
+                chain.ChainPolicy.VerificationTime = cert.NotBefore.AddHours(2);
+                Assert.False(chain.Build(cert));
+
+                X509ChainElement certElement = chain.ChainElements
+                    .OfType<X509ChainElement>()
+                    .Single(e => e.Certificate.Subject == cert.Subject);
+
+                const X509ChainStatusFlags expectedFlag = X509ChainStatusFlags.ExplicitDistrust;
+                X509ChainStatusFlags actualFlags = certElement.AllStatusFlags();
+                Assert.True((actualFlags & expectedFlag) == expectedFlag, $"Has expected flag {expectedFlag} but was {actualFlags}");
+            }
+        }
+
+        [Fact]
+        [PlatformSpecific(~TestPlatforms.Linux)]
+        public static void BuildChainForCertificateSignedWithDisallowedKey()
+        {
+            byte[] intermediateBytes = Convert.FromBase64String(@"
+MIIDzTCCAzagAwIBAgIERpwssDANBgkqhkiG9w0BAQUFADCBwzELMAkGA1UEBhMC
+VVMxFDASBgNVBAoTC0VudHJ1c3QubmV0MTswOQYDVQQLEzJ3d3cuZW50cnVzdC5u
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+B8WfedLHjFW/TMcnXlEWKz4=");
+            byte[] leafBytes = Convert.FromBase64String(@"
+MIID3zCCA0igAwIBAgIRAK91OcqDBdcxtsg6T03CzCQwDQYJKoZIhvcNAQEFBQAw
+aDELMAkGA1UEBhMCTkwxEjAQBgNVBAoTCURpZ2lOb3RhcjEjMCEGA1UEAxMaRGln
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+
+            using (X509Certificate2 intermediateCert = new X509Certificate2(intermediateBytes))
+            using (X509Certificate2 cert = new X509Certificate2(leafBytes))
+            using (ChainHolder chainHolder = new ChainHolder())
+            {
+                X509Chain chain = chainHolder.Chain;
+                chain.ChainPolicy.RevocationMode = X509RevocationMode.NoCheck;
+                chain.ChainPolicy.VerificationTime = cert.NotBefore.AddHours(2);
+                chain.ChainPolicy.ExtraStore.Add(intermediateCert);
+                Assert.False(chain.Build(cert));
+
+                X509ChainElement certElement = chain.ChainElements
+                    .OfType<X509ChainElement>()
+                    .Single(e => e.Certificate.Subject == intermediateCert.Subject);
+
+                const X509ChainStatusFlags expectedFlag = X509ChainStatusFlags.ExplicitDistrust;
+                X509ChainStatusFlags actualFlags = certElement.AllStatusFlags();
+                Assert.True((actualFlags & expectedFlag) == expectedFlag, $"Has expected flag {expectedFlag} but was {actualFlags}");
+            }
+        }
+
         internal static X509ChainStatusFlags AllStatusFlags(this X509Chain chain)
         {
             return chain.ChainStatus.Aggregate(