Independent / Integrated NTLMAuthenticationProvider: GetContextAttribute can now return OS version

SMBLibrary/Authentication/GSSAPI/Enums/GSSAttributeName.cs

@@ -13,6 +13,7 @@ namespace SMBLibrary.Authentication.GSSAPI
         /// </summary>
         IsGuest,
         MachineName,
+        OSVersion,
         SessionKey,
         UserName,
     }

SMBLibrary/Authentication/NTLM/IndependentNTLMAuthenticationProvider.cs

@@ -22,6 +22,7 @@ namespace SMBLibrary.Authentication.NTLM
             public string DomainName;
             public string UserName;
             public string WorkStation;
+            public string OSVersion;
             public byte[] SessionKey;
             public bool IsGuest;
 
@@ -134,6 +135,11 @@ namespace SMBLibrary.Authentication.NTLM
             authContext.DomainName = message.DomainName;
             authContext.UserName = message.UserName;
             authContext.WorkStation = message.WorkStation;
+            if (message.Version != null)
+            {
+                authContext.OSVersion = message.Version.ToString();
+            }
+
             if ((message.NegotiateFlags & NegotiateFlags.Anonymous) > 0)
             {
                 if (this.EnableGuestLogin)
@@ -244,6 +250,8 @@ namespace SMBLibrary.Authentication.NTLM
                         return authContext.IsGuest;
                     case GSSAttributeName.MachineName:
                         return authContext.WorkStation;
+                    case GSSAttributeName.OSVersion:
+                        return authContext.OSVersion;
                     case GSSAttributeName.SessionKey:
                         return authContext.SessionKey;
                     case GSSAttributeName.UserName:

SMBLibrary/Authentication/NTLM/Structures/NTLMVersion.cs

@@ -48,6 +48,11 @@ namespace SMBLibrary.Authentication.NTLM
             ByteWriter.WriteByte(buffer, offset + 7, NTLMRevisionCurrent);
         }
 
+        public override string ToString()
+        {
+            return String.Format("{0}.{1}.{2}", ProductMajorVersion, ProductMinorVersion, ProductBuild);
+        }
+
         public static NTLMVersion WindowsXP
         {
             get

SMBLibrary/Win32/IntegratedNTLMAuthenticationProvider.cs

@@ -24,6 +24,7 @@ namespace SMBLibrary.Win32.Security
             public string DomainName;
             public string UserName;
             public string WorkStation;
+            public string OSVersion;
             public bool IsGuest;
 
             public AuthContext(SecHandle serverContext)
@@ -75,6 +76,11 @@ namespace SMBLibrary.Win32.Security
             authContext.DomainName = message.DomainName;
             authContext.UserName = message.UserName;
             authContext.WorkStation = message.WorkStation;
+            if (message.Version != null)
+            {
+                authContext.OSVersion = message.Version.ToString();
+            }
+
             if ((message.NegotiateFlags & NegotiateFlags.Anonymous) > 0 ||
                 !IsUserExists(message.UserName))
             {
@@ -160,6 +166,8 @@ namespace SMBLibrary.Win32.Security
                         return authContext.IsGuest;
                     case GSSAttributeName.MachineName:
                         return authContext.WorkStation;
+                    case GSSAttributeName.OSVersion:
+                        return authContext.OSVersion;
                     case GSSAttributeName.SessionKey:
                         return SSPIHelper.GetSessionKey(authContext.ServerContext);
                     case GSSAttributeName.UserName: