auth_to_local struggle miguel.sanders at
Mon May 11 03:58:07 EDT 2009

Hi folks

I'm struggling with the auth_to_local rule.
I want the principal root/samehost.some.domain at SOMEREALM to be mapped to the user root.
I created the following auth_to_local rule in krb5.conf
	auth_to_local = RULE:[2:$2/$1@$0](\/.*@SOMEREALM)s/\/.*@.*//

I wrote a sample test program in order to verify the authorization part:
#include <krb5.h>
#include <stdio.h>

int main(int argc, const char **argv){
        if (argc != 3) {
                fprintf(stderr,"Number of arguments incorrect\n");
                fprintf(stderr,"1) Kerberos Principal 2) Mapped Local User\n");
        krb5_context context;
        krb5_principal client;
        krb5_boolean logon;


        logon = krb5_kuserok(context, client, (char *)argv[2]);
        if (logon)
                fprintf(stdout,"Principal %s is authorized to login as user %s\n",(char *)argv[1],(char *)argv[2]);
                fprintf(stderr,"Principal %s is NOT authorized to login as user %s\n",(char *)argv[1],(char *)argv[2]);

        krb5_free_principal(context, client);

Unfortunately, my test program always says the following:

./krb5 root/samehost.some.domain at SOMEREALM root
Principal root/samehost.some.domain at SOMEREALM is NOT authorized to login as user root

What's wrong with my rule? The tranformation rule is correct AFAIK.

Thanks for your help!

Met vriendelijke groet
Best regards
Bien à vous

ArcelorMittal Gent

UNIX Systems & Storage
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T +32 9 347 3538 | F +32 9 347 4901 | M +32478 805 023
E miguel.sanders at

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