Sasl passthrough authentication

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Hi,

I am attempting to setup SASL passthrough authentication on a server. 

I have install and configured saslauthd, and plan to use this with kerberos5

When i attempt to use the command

testsaslauthd -u william at REALM -p supersecretpassword

I get the following in /var/log/messages.

Oct  7 16:37:13 blackrabbit saslauthd[1557]: auth_krb5: k5support_verify_tgt

[root at blackrabbit ~]# saslauthd -a kerberos5 -d -V
saslauthd[1555] :main            : num_procs  : 5
saslauthd[1555] :main            : mech_option: NULL
saslauthd[1555] :main            : run_path   : /var/run/saslauthd
saslauthd[1555] :main            : auth_mech  : kerberos5
saslauthd[1555] :ipc_init        : using accept lock file: /var/run/saslauthd/mux.accept
saslauthd[1555] :detach_tty      : master pid is: 0
saslauthd[1555] :ipc_init        : listening on socket: /var/run/saslauthd/mux
saslauthd[1555] :main            : using process model
saslauthd[1555] :have_baby       : forked child: 1556
saslauthd[1556] :get_accept_lock : acquired accept lock
saslauthd[1555] :have_baby       : forked child: 1557
saslauthd[1555] :have_baby       : forked child: 1558
saslauthd[1555] :have_baby       : forked child: 1559
saslauthd[1557] :rel_accept_lock : released accept lock
saslauthd[1558] :get_accept_lock : acquired accept lock
saslauthd[1557] :do_auth         : auth failure: [user=william at REALM] [service=imap] [realm=] [mech=kerberos5] [reason=saslauthd internal error]

I have looked for help on this, and sadly can only find that i should have a host/fqdn at REALM principal in my /etc/krb5.keytab . I have already done this however. /etc/hosts also corresponds with this correctly and my servers fqdn is listed inside. (host/blackrabbit.realm at REALM)

My krb5kdc log shows 

Oct 07 16:39:07 blackrabbit.realm krb5kdc[868](info): AS_REQ (4 etypes {18 17 16 23}) 127.0.0.1: ISSUE: authtime 1286431747, etypes {rep=16 tkt=16 ses=16}, william at REALM for krbtgt/REALM at REALM

I know that i am missing something obvious, but any help or suggestions would be appreciated 

Sincerely

William Brown

pgp.mit.edu



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