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Re: About pam_access



On 06.05.2011 13:00, Александр Берсенев wrote:
About unpredictable results.
Here is a my /etc/pam.d/rsh config, for simpleness
/etc/security/access.conf is empty(allow everyone) and
/etc/security/pam_env.conf is also empty(not set any env):

#%PAM-1.0

auth       sufficient            pam_access.so
auth       optional     pam_env.so

account    include      password-auth
session    optional     pam_keyinit.so    force revoke
session    required     pam_loginuid.so
session    include      password-auth

The rsh authorizes me successfully:
[u1333 um32 ~]$ rsh umu4 id
uid=1003(u1333) gid=100(users)
группы=100(users),1013(OSO),5001(um32),5005(um64),5006(umt),5007(cluster_sudo)

But this configuration gives me an access denied error:

#%PAM-1.0

auth       sufficient            pam_access.so
#auth       optional     pam_env.so

account    include      password-auth
session    optional     pam_keyinit.so    force revoke
session    required     pam_loginuid.so
session    include      password-auth

[u1333 um32 ~]$ rsh umu4 id
Permission denied.

If I use "auth required pam_securetty.so" instead of "auth optional
pam_env.so" in above samples the results are same.

I think it is a kind of unpredictable. In my environment I forced to
keep almost-do-noting module pam_env.so(with empty config file) and
"don't del this line or it will be broken" comment.

Also the line "auth required pam_access.so" in pam.d will always fall.
Changing "return (PAM_SUCCESS)" instead (PAM_IGNORE) in pam_sm_setcred
solves a problem, but I don't know about possible drawbacks of this
decision.

How about adding 'auth required pam_permit.so' at the end of 'auth' stack? It's not unpredictable, if the entire stack fails in the case of no module in the stack succeeds, since there's an implicit PAM_DENY at the end of the stack.

--

Sincerely Yours, Dan.


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