gss krb5 mech enhanced error messages

Save detailed error messages (usually from the krb5 library) in
per-thread storage, mapping each error code to the most recently
produced message for it.  Return the message from display_status.

Currently not implemented for a few cases where the krb5 mechanism
returns a minor status code of 0, or another value different from the
libkrb5 error code.

Other functions are available to store a generic string or formatted
message, but aren't used much at present.

Tested with these errors in context establishment:
 * missing ccache (libkrb5 shows pathname if FILE: type)
 * missing keytab (libkrb5 shows pathname if FILE: type)
 * server principal unknown (libkrb5 shows server principal)

ticket: new

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@19672 dc483132-0cff-0310-8789-dd5450dbe970

1 files changed, 3 insertions, 1 deletions

diff --git a/src/lib/gssapi/krb5/gssapi_krb5.c b/src/lib/gssapi/krb5/gssapi_krb5.c
index a0953e0b23..224484f44b 100644
--- a/src/lib/gssapi/krb5/gssapi_krb5.c
+++ b/src/lib/gssapi/krb5/gssapi_krb5.c
@@ -186,7 +186,7 @@ int *out_caller_provided_name)
         *out_caller_provided_name = 
 	  (k5_getspecific(K5_KEY_GSS_KRB5_CCACHE_NAME) != NULL);
     }
-    
+
     *minor_status = 0;
     return GSS_S_COMPLETE;
 }
@@ -220,6 +220,8 @@ kg_get_ccache_name (OM_uint32 *minor_status, const char **out_name)
 		    err = errno;
 	    }
 	}
+	if (err && context)
+	    save_error_info(err, context);
 	if (context)
 	    krb5_free_context(context);
     }