Authenticating via Kerberos in SSH on Solaris 9

[Douglas E. Engert]

Tyson Oswald wrote:
> Greetings All,
>  
> I have been making good progress in getting Kerberos to work on Solaris 9 and Windows AD.  I have it working very well from the console.  Problems arise when I use SSH.  I have my pam.conf configured as follows for SSH which is identical to login
>  
> sshd   auth sufficient           pam_unix_auth.so.1
> sshd   auth required           pam_krb5.so.1 try_first_pass debug

> 
> When I connect to SSH it does an initial call to the DC before I even enter my password, like so

So do you also have the sshd auth requisite pam_authok_get.so.1
before these? It should prompt for the initial password. It might
be that the try_first_pass is trying the null string passed by sshd
to pam, thus the first decrypt failure message.

We are using something like this, but not using the Solaris pam_krb5:

# sshd - keyboard interactive uses all PAM exists, but
#		 privsep gets in the way. So use force.
#		 PAM session is called when GSSAPI delegation or
#                Kerberos password used, so get AFS token in all three cases.
#                We want a session type cache, so with ANL PAM
#		 pass in ccache=
#		 We need ccache= on HP as it does not have pam_putenv
#		 RedHat PAM uses session cache already
#
sshd	auth requisite      pam_authtok_get.so.1
sshd	auth required       pam_dhkeys.so.1
sshd	auth sufficient	    /krb5/lib/pam_krb5.so.1 use_first_pass forwardable force_creds cache=/tmp/krb5cc_u%u_p%p
sshd    auth required       pam_unix_auth.so.1
#
sshd    session required    pam_unix_session.so.1
sshd    session required    /krb5/lib/pam_afs2.so.1
#


If you are interested, we have MIT Krb5 1.3.5 with OpenSSH-3.9p1
working with the Solaris 9 dtlogin, dtsession, xlock, xscreensaver.
The KDC is Windows 2003 AD.


>  
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 655841 local6.debug] PAM-KRB5 (auth): pam_sm_authenticate flags=1
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 549540 local6.debug] PAM-KRB5 (auth): attempt_krb5_auth: start: user='cbrown'
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 179272 local6.debug] PAM-KRB5 (auth): attempt_krb5_auth: krb5_get_init_creds_password returns: Decrypt integrity check failed
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 399723 local6.debug] PAM-KRB5 (auth): clearing initcreds in pam_authenticate()
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 833335 local6.debug] PAM-KRB5 (auth): attempt_krb5_auth returning 9
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 954327 local6.debug] PAM-KRB5 (auth): prompting for password
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 549540 local6.debug] PAM-KRB5 (auth): attempt_krb5_auth: start: user='cbrown'
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 179272 local6.debug] PAM-KRB5 (auth): attempt_krb5_auth: krb5_get_init_creds_password returns: Decrypt integrity check failed
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 399723 local6.debug] PAM-KRB5 (auth): clearing initcreds in pam_authenticate()
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 833335 local6.debug] PAM-KRB5 (auth): attempt_krb5_auth returning 9
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 914654 local6.debug] PAM-KRB5 (auth): pam_sm_auth finalize ccname env, result =9, env ='KRB5CCNAME=FILE:/tmp/krb5cc_106', age = 0, status = 9
> Jan  4 10:03:48 snoopy sshd[19516]: [ID 525286 local6.debug] PAM-KRB5 (auth): end: Authentication failed
> 
>  
> The problem here is it will evantually lock out our domain account.  I am pretty sure this is not a Kerberos issue but was wondering if anyone else ran into this issue.  I am using Solaris 9 and the SSH that came with it so  Sun_SSH_1.0.1.
>  
> thanks much,
> Tyson Oswald
> 
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> 
> 
> 

-- 

  Douglas E. Engert  <DEEngert at anl.gov>
  Argonne National Laboratory
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  (630) 252-5444