Fixes regression in Integrated Security auth in Managed SNI

Author: cheenamalhotra

src/Microsoft.Data.SqlClient/netcore/src/Common/src/System/Net/Security/NegotiateStreamPal.Unix.cs

@@ -189,7 +189,14 @@ internal static int QueryMaxTokenSize(string package)
             // This value is not used on Unix
             return 0;
         }
-        
+
+        internal static SecurityStatusPal CompleteAuthToken(
+            ref SafeDeleteContext securityContext,
+            SecurityBuffer[] inSecurityBufferArray)
+        {
+            return new SecurityStatusPal(SecurityStatusPalErrorCode.OK);
+        }
+
         internal static SafeFreeCredentials AcquireDefaultCredential(string package, bool isServer)
         {
             return AcquireCredentialsHandle(package, isServer, new NetworkCredential(string.Empty, string.Empty, string.Empty));

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SNIProxy.cs

@@ -96,7 +96,8 @@ internal void GenSspiClientContext(SspiClientContextStatus sspiClientContextStat
                 inSecurityBufferArray = Array.Empty<SecurityBuffer>();
             }
 
-            int tokenSize = MaxTokenSize;
+            int tokenSize = NegotiateStreamPal.QueryMaxTokenSize(securityPackage);
+
             SecurityBuffer outSecurityBuffer = new SecurityBuffer(tokenSize, SecurityBufferType.SECBUFFER_TOKEN);
 
             ContextFlagsPal requestedContextFlags = ContextFlagsPal.Connection
@@ -119,7 +120,7 @@ internal void GenSspiClientContext(SspiClientContextStatus sspiClientContextStat
                 statusCode.ErrorCode == SecurityStatusPalErrorCode.CompAndContinue)
             {
                 inSecurityBufferArray = new SecurityBuffer[] { outSecurityBuffer };
-                statusCode = new SecurityStatusPal(SecurityStatusPalErrorCode.OK);
+                statusCode = NegotiateStreamPal.CompleteAuthToken(ref securityContext, inSecurityBufferArray);
                 outSecurityBuffer.token = null;
             }