Added the ability to specify to the PwdMechanism through the auth.policy that it should only utilize credentials that match the specified realm.

CASA-auth-token/client/library/mechanisms/pwd/get.c

@@ -40,6 +40,7 @@ CasaStatus
 GetUserCredentials(
    IN       const char *pRealm,
    IN       void *pCredStoreScope,
+   IN       bool realm_credentials_only,
    INOUT    char **ppUsername,
    INOUT    char **ppPassword)
 //
@@ -52,6 +53,9 @@ GetUserCredentials(
 //       to specific users. This can only be leveraged when running in
 //       the context of System under Windows.
 //   
+//    realm_credentials_only -
+//       Only utilize credentials associated with the specified realm.
+//               
 //    ppUsername -
 //       Pointer to variable that will receive buffer with the username.
 //               
@@ -105,7 +109,8 @@ GetUserCredentials(
                                      &credtype,
                                      &credential,
                                      (SSCS_EXT_T*) pCredStoreScope);
-         if (rcode != NSSCS_SUCCESS)
+         if (rcode != NSSCS_SUCCESS
+             && realm_credentials_only == false)
          {
             // There were no credentials for the realm, now try to obtain the
             // desktop credentials.
@@ -275,6 +280,7 @@ AuthTokenIf_GetAuthToken(
    char        *pUsername = NULL;
    char        *pPassword = NULL;
    char        *pToken;
+   bool        realm_credentials_only = false;
 
    DbgTrace(1, "-AuthTokenIf_GetAuthToken- Start\n", 0);
 
@@ -293,9 +299,44 @@ AuthTokenIf_GetAuthToken(
       goto exit;
    }
 
+   // Process any mechanism information that may have been provided
+   if (pMechInfo)
+   {
+      // Mechanism information has been provided. Mechanism information
+      // consists of semicolon delimited settings. The settings are formated
+      // using the format settingName=settingvalue. No white space is allowed
+      // as part of the mechanism information.
+      char *pNextSettingToken;
+      char *pSettingValueToken = strtok_s(pMechInfo, ";", &pNextSettingToken);
+      while (pSettingValueToken != NULL)
+      {
+         char *pNextToken;
+         char *pSettingName = strtok_s(pSettingValueToken, "=", &pNextToken);
+         char *pSettingValue = strtok_s(NULL, "=", &pNextToken);
+         if (pSettingValue)
+         {
+            // Process the setting
+            if (strcmpi(pSettingName, "REALM_CREDENTIALS_ONLY") == 0)
+            {
+               if (strcmpi(pSettingValue, "true") == 0)
+               {
+                  realm_credentials_only = true;
+               }
+            }
+         }
+         else
+         {
+            printf("Bad setting\n");
+         }
+
+         pSettingValueToken = strtok_s(NULL, ";", &pNextSettingToken);
+      }
+   }
+
    // Get the user credentials
    retStatus = GetUserCredentials(pContext,
                                   pCredStoreScope,
+                                  realm_credentials_only,
                                   &pUsername,
                                   &pPassword);
    if (CASA_SUCCESS(retStatus))