remap mechanism-specific status codes in mechglue/spnego

This patch creates a mapping in the mechglue/spnego code to modify
mechanism status codes when passing them back to the application, so
that mechglue's display_status dispatcher can determine the correct
mechanism to dispatch to.

This is part of the "get enhanced error messages from gssapi
applications" project; ticket 5590 has updates to the Kerberos 5
mechanism to extract enhanced error messages (when there are any) from
the Kerberos library.


util/gen.pl, util/t_*.pm: New code generation script and templates.

lib/gssapi/generic: Add a new, global mapping that enumerates the
{mechOID,status} pairs as they're seen, allowing a magic mechOID value
to indicate com_err error codes from mechglue and spnego, and
reserving status code 0 for unknown errors.  Preload the Kerberos
"wrong principal" error code once for each mechanism OID used for
Kerberos, so the entries get fixed positions (1-3) in the table.

lib/gssapi/gss_libinit.c: Call the initializer and destructor
functions.

lib/gssapi/mechglue, lib/gssapi/spnego: Enter all mechanism-generated
or locally-generated status codes into the mapping table, and return
the table index to the application.  Do the reverse in display_status,
to get the messages from the mechanism..

lib/rpc: Define new function gssrpcint_printf to use for debugging
instead of printf, to redirect output away from dejagnu; add a couple
more debugging calls.  Check for minor status codes 1-3 now instead of
KRB5KRB_AP_WRONG_PRINC.

tests/dejagnu/krb-standalone/gssftp.exp: Test getting more detailed
error messages back, by having the ftp client attempt to authenticate
to a non-existent service, and examining the error message for the
service principal name.

ticket: new

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@19831 dc483132-0cff-0310-8789-dd5450dbe970

1 files changed, 4 insertions, 0 deletions

diff --git a/src/lib/gssapi/gss_libinit.c b/src/lib/gssapi/gss_libinit.c
index b96eb9e7aa..bb90857132 100644
--- a/src/lib/gssapi/gss_libinit.c
+++ b/src/lib/gssapi/gss_libinit.c
@@ -44,6 +44,9 @@ int gssint_lib_init(void)
 			  krb5_gss_delete_error_info);
     if (err)
 	return err;
+    err = gssint_mecherrmap_init();
+    if (err)
+	return err;
 #ifndef _WIN32
     err = k5_mutex_finish_init(&kg_kdc_flag_mutex);
     if (err)
@@ -74,6 +77,7 @@ void gssint_lib_fini(void)
     k5_mutex_destroy(&kg_kdc_flag_mutex);
 #endif
     k5_mutex_destroy(&gssint_krb5_keytab_lock);
+    gssint_mecherrmap_destroy();
     gssint_mechglue_fini();
 }