login.access, login and su.

Tuareg tuaregmex at gmail.com
Mon Oct 15 16:54:09 PDT 2007

Good afternoon,

I need to restric the access to some accounts, we are using FreeBSD
4.10, this is the configuration for "login" in /etc/pam.conf

login   auth    sufficient      pam_skey.so
login   auth    sufficient      pam_opie.so                     no_fake_prompts
#login  auth    requisite       pam_opieaccess.so
login   auth    requisite       pam_cleartext_pass_ok.so
#login  auth    sufficient      pam_kerberosIV.so               try_first_pass
#login  auth    sufficient      pam_krb5.so                     try_first_pass
login   auth    required        pam_unix.so                     try_first_pass
login   account required        pam_unix.so
login   password required       pam_permit.so
login   session required        pam_permit.so

And this is the content of /etc/login.access:

-:ALL EXCEPT user user1 : ALL

If we do "su - user3" in FreeBSD 4.10 the result is that we become
"user3" succesfully, and no restricction message appears.

% su - user3

With FreeBSD 6.1/6.2, we are able to restrict the access if the
account isn't appear in /etc/login.access, for example:

-:ALL EXCEPT user user1 user2 : ALL

And this is the content of /etc/pamd./login:

# PAM configuration for the "login" service

# auth
auth            required        pam_nologin.so          no_warn
auth            sufficient      pam_self.so             no_warn
auth            include         system

# account
account         requisite       pam_securetty.so
account         include         system

# session
session         include         system

# password
password        include         system

If we are using the account "user" and whant to change to "user3"
using "su -" this never happen:

% su - user3
pam_login_access: pam_sm_acct_mgmt: user3 is not allowed to log in on /dev/ttyp0
su: Sorry

Which is exactly what we need, but for FreeBSD 4.10.

There are differences between 4.10 and 6.1/6.2 for the configuration
of PAM and all it's modules, but the configuration for login.acces is
the same.

We read the documentation at the FreeBSD site about login.access and
there is no difference for the sintaxis of this file.

We also had read the man for login/pam/login.conf/login.access.

The file "login.conf" is the same for 4.10 and 6.1/6.2, we didn't
modified it's content.

Is there another configuration file we are missing that should be
modified to restrict the "user" become "user3" using "su -" in FreeBSD
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