[OpenAFS] aklog and PAM for Solaris

Douglas E. Engert deengert@anl.gov
Mon, 22 Aug 2005 09:50:04 -0500

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John Tang Boyland wrote:
> I've been able to transition to using Kerberos V with the help
> of people on this list and Ken's migration kit (thanks!).  I put some
> notes in the Wiki to fill in some gaps.
> I notice that openafs-1.3.87 includes aklog (good!) but it seems to be
> missing a PAM module that can be used with krb5.  The man page
> pam_afs.5 says one should use pam_krb5 instead of pam_afs but of
> course, pam_krb5 doesn't get AFS tokens.  Because of the way dtlogin
> works on Solaris, you need to get tokens before the .profile/.cshrc is
> sourced.  A PAM module seems to be the right thing.  There are old
> notes talking about pam_aklog (on Martin Schultz's old AFS-Krb5 web
> page that is only available in Google caches) including about
> T. Clancy's pam_aklog with a dead URL.
> (1) How do other sites handle this?  Is pam_aklog passe ?

We are uisng the Solaris 10 provided pam_krb5, and Solaris provided
Kerberos which knows nothing about AFS.

We have added an additional pam_afs2 that is called after the pam_krb5
has sorted the tickets and set KRB5CCNAME in the pam_env. pam_afs2 then
fork/exec of gssklog. It could just as easily fork/exec the aklog from
1.3.87 which is on my list of thing to try. Note that pam_afs2 has
no Kerberos or AFS code, it just passes the pam_env with the KRB5CCNAME
to tha gssklog or aklog.

The above works with Solaris 10's version of SSHD, dtlogin, login, xlock
ad xscreensaver.  With xlock and xscrensver the tickets and tokens are
refresehed.  See attached pam.conf

Solaris 10's sshd has some problems with trying to use the default
ticket cache for a user, so we went back to using session based
credentials where each session has its own ticket cache pointed
at by KRB5CCNAME. To force the SSHD to do this, we added a
pam_krb5_ccache  that calls pam_put_env to preset the KRB5CCNAME
to be used by the SSHD, thus going back to session based credentials.

(On Solaris 9 we are are using a version of Frank Cusack's pam_krb5
and pam_afs2 in some cases.)

> (2) If not, how can I get it for Solaris ?
>   (2b) Is there some reason why it isn't integrated with
>        aklog in the src tree ?  (or in the PAM directory.)

I believe that the pam_krb5 and pam_afs* should not be integrated,
on any system, as (I have said in the past.) Having them seperate allows
one to use the vendor's pam_krb5.

> (3) Can we get some documentation/help from this from Openafs.org ?
>    There are many places that ancourage one to use krb5 instead
>    of AFS kaserver, but one's left scrounging around in unofficial 
>    RPM's off random websites to get something to work with Solaris.

If anyone is interested, Here is one of those random sites:


> Thanks!
> John
> _______________________________________________
> OpenAFS-info mailing list
> OpenAFS-info@openafs.org
> https://lists.openafs.org/mailman/listinfo/openafs-info


  Douglas E. Engert  <DEEngert@anl.gov>
  Argonne National Laboratory
  9700 South Cass Avenue
  Argonne, Illinois  60439
  (630) 252-5444

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#ident	"@(#)pam.conf	1.28	04/04/21 SMI"
# Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
# PAM configuration
# Unless explicitly defined, all services use the modules
# defined in the "other" section.
# Modules are defined with relative pathnames, i.e., they are
# relative to /usr/lib/security/$ISA. Absolute path names, as
# present in this file in previous releases are still acceptable.
# Authentication management
# login service (explicit because of pam_dial_auth)
login	auth requisite		pam_authtok_get.so.1
login	auth required		pam_dhkeys.so.1
login	auth required		pam_unix_cred.so.1
login	auth required		pam_unix_auth.so.1
login	auth required		pam_dial_auth.so.1
# rlogin service (explicit because of pam_rhost_auth)
rlogin	auth requisite		pam_authtok_get.so.1
rlogin	auth required		pam_dhkeys.so.1
rlogin	auth required		pam_unix_cred.so.1
rlogin	auth required		pam_unix_auth.so.1
# Kerberized rlogin service
krlogin	auth required		pam_unix_cred.so.1
krlogin	auth binding		pam_krb5.so.1
krlogin auth required          /krb5/lib/pam_afs2.so.1 
krlogin	auth required		pam_unix_auth.so.1
# rsh service (explicit because of pam_rhost_auth,
# and pam_unix_auth for meaningful pam_setcred)
rsh	auth required		pam_unix_cred.so.1
# Kerberized rsh service
krsh	auth required		pam_unix_cred.so.1
krsh	auth required		pam_krb5.so.1 
krsh    auth required		/krb5/lib/pam_afs2.so.1  
#krsh	auth required		pam_unix_auth.so.1

# Kerberized telnet service
ktelnet	auth required		pam_unix_cred.so.1
ktelnet	auth binding		pam_krb5.so.1
#DEE leave unmodified till the pam.conf and pam_afs2 are stable
#DEE leaves us a way on to machine
# But this allows password login
ktelnet	auth required		pam_unix_auth.so.1
# PPP service (explicit because of pam_dial_auth)
ppp	auth requisite		pam_authtok_get.so.1
ppp	auth required		pam_dhkeys.so.1
ppp	auth required		pam_unix_cred.so.1
ppp	auth required		pam_unix_auth.so.1
ppp	auth required		pam_dial_auth.so.1
# Default definitions for Authentication management
# Used when service name is not explicitly mentioned for authentication
other	auth requisite		pam_authtok_get.so.1
other	auth required		pam_dhkeys.so.1
other	auth required		pam_unix_cred.so.1
other	auth required		pam_unix_auth.so.1
# passwd command (explicit because of a different authentication module)
passwd	auth required		pam_passwd_auth.so.1
# cron service (explicit because of non-usage of pam_roles.so.1)
cron	account required	pam_unix_account.so.1
# Default definition for Account management
# Used when service name is not explicitly mentioned for account management
other	account requisite	pam_roles.so.1
other	account required	pam_unix_account.so.1
# Default definition for Session management
# Used when service name is not explicitly mentioned for session management
other	session required	pam_unix_session.so.1
# Default definition for  Password management
# Used when service name is not explicitly mentioned for password management
other	password required	pam_dhkeys.so.1
other	password requisite	pam_authtok_get.so.1
other	password requisite	pam_authtok_check.so.1
other	password required	pam_authtok_store.so.1
# Support for Kerberos V5 authentication and example configurations can
# be found in the pam_krb5(5) man page under the "EXAMPLES" section.

# DEE from pam_krb5_man pages: 

#DEE smartcard failed, so skip it for now
#dtlogin	auth requisite		pam_smartcard.so.1
dtlogin		auth requisite		pam_authtok_get.so.1
dtlogin		auth required		pam_dhkeys.so.1
dtlogin		auth required		pam_unix_cred.so.1
dtlogin		auth optional		pam_krb5.so.1 
dtlogin		auth required		/krb5/lib/pam_afs2.so.1   
# allows password login 
dtlogin		auth optional		pam_unix_auth.so.1

# dtsession - lock/unlock screen, refresh creds and AFS token
dtsession	auth requisite		pam_authtok_get.so.1
dtsession	auth required		pam_dhkeys.so.1
dtsession	auth optional		pam_krb5.so.1    
dtsession	auth required		/krb5/lib/pam_afs2.so.1 nopag
# allows unlock with local password
dtsession	auth optional		pam_unix_auth.so.1

# xlock 
xlock   auth requisite		pam_authtok_get.so.1
xlock   auth required		pam_dhkeys.so.1
xlock   auth optional		pam_krb5.so.1  
xlock   auth required		/krb5/lib/pam_afs2.so.1  nopag
# allows unlock with local password
xlock   auth optional		pam_unix_auth.so.1

# xscreensaver used by gnome or CDE
xscreensaver    auth requisite		pam_authtok_get.so.1
xscreensaver    auth required		pam_dhkeys.so.1
xscreensaver    auth optional		pam_krb5.so.1  
xscreensaver    auth required		/krb5/lib/pam_afs2.so.1  nopag
# allows unlock with local password
xscreensaver    auth optional		pam_unix_auth.so.1

# sshd - keyboard interactive uses all PAM exits, but
#        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= to account routine
#        RedHat PAM uses session caches already
sshd-kbdint	auth requisite		pam_authtok_get.so.1
sshd-kbdint	auth required		pam_dhkeys.so.1
sshd-kbdint	auth required		pam_krb5.so.1  
# allows login with local password
sshd-kbdint	auth optional		pam_unix_auth.so.1

sshd-kdbint account requisite   pam_roles.so.1
sshd-kdbint	account required    pam_unix_account.so.1
sshd-kdbint	account required    /krb5/lib/pam_krb5_ccache.so.1  ccache=/tmp/krb5cc_pw_%u_%p 

sshd-kdbint   session required	pam_unix_session.so.1
sshd-kdbint   session required	/krb5/lib/pam_afs2.so.1 

# Used by GSS, but ssh has bug about saving creds, so we use session based creds. 

sshd-gssapi   account requisite  pam_roles.so.1
sshd-gssapi   account required   pam_unix_account.so.1
sshd-gssapi	  account required   /krb5/lib/pam_krb5_ccache.so.1  ccache=/tmp/krb5cc_%u_%p

sshd-gssapi   session required	pam_unix_session.so.1
sshd-gssapi   session required	/krb5/lib/pam_afs2.so.1 
sshd-gssapi	  session required  /krb5/lib/pam_krb5_ccache.so.1  clean