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NAME
pam_unix - authentication, account, session, and password
management PAM modules for UNIX
SYNOPSIS
/usr/lib/security/pam_unix.so.1
DESCRIPTION
The UNIX service module for PAM,
/usr/lib/security/pam_unix.so.1, provides functionality for
all four PAM modules: authentication, account management,
session management and password management. The
pam_unix.so.1 module is a shared object that can be dynami-
cally loaded to provide the necessary functionality upon
demand. Its path is specified in the PAM configuration file.
Unix Authentication Module
The UNIX authentication component provides functions to ver-
ify the identity of a user, (pam_sm_authenticate()) and to
set user specific credentials (pam_sm_setcred()).
pam_sm_authenticate() compares the user entered password
with the password from the UNIX password database. If the
passwords match, the user is authenticated. If the user also
has secure RPC credentials and the secure RPC password is
the same as the UNIX password, then the secure RPC creden-
tials are also obtained.
The following options may be passed to the UNIX service
module:
debug syslog(3C) debugging information at LOG_DEBUG level.
nowarn
Turn off warning messages.
use_first_pass
It compares the password in the password database with
the user's initial password (entered when the user
authenticated to the first authentication module in
the stack). If the passwords do not match, or if no
password has been entered, it quits and does not
prompt the user for a password.
This option should only be used if the authentica-
tion service is designated as optional in the pam.conf
configuration file.
try_first_pass
It compares the password in the password database with
the user's initial password (entered when the user
authenticated to the first authentication module in
the stack). If the passwords do not match, or if no
password has been entered, prompt the user for a
password. When prompting for the current password, the
UNIX authentication module will use the prompt, "pass-
word:" unless one of the following scenarios occur:
1. The option try_first_pass is specified and the
password entered for the first module in the stack
fails for the UNIX module.
2. The option try_first_pass is not specified, and
the earlier authentication modules listed in the
pam.conf file have prompted the user for the pass-
word.
In these two cases, the UNIX authentication module will use
the prompt "SYSTEM password:". The pam_sm_setcred() function
sets user specific credentials. If the user had secure RPC
credentials, but the secure RPC password was not the same as
the UNIX password, then a warning message is printed. If the
user wants to get secure RPC credentials, then keylogin(1)
needs to be run.
Unix Account Management Module
The UNIX account management component provides a function to
perform account management, pam_sm_acct_mgmt(). The function
retrieves the user's password entry from the UNIX password
database and verifies that the user's account and password
have not expired. The following options may be passed in to
the UNIX service module:
debug syslog(3C) debugging information at LOG_DEBUG level.
nowarn
Turn off warning messages.
Unix Session Management Module
The UNIX session management component provides functions to
initiate pam_sm_open_session() and terminate
pam_sm_close_session() UNIX sessions. For UNIX,
pam_open_session updates the /var/adm/lastlog file. The
account management module reads this file to determine the
previous time the user logged in. The following options may
be passed in to the UNIX service module:
debug syslog(3C) debugging information at LOG_DEBUG level.
nowarn
Turn off warning messages. pam_close_session is a null
function.
Unix Password Management Module
The UNIX password management component provides a function
to change passwords pam_sm_chauthtok() in the UNIX password
database. This module must be required in pam.conf. It can-
not be optional or sufficient. The following options may be
passed in to the UNIX service module:
debug syslog(3C) Debugging information at LOG_DEBUG level.
nowarn
Turn off warning messages.
use_first_pass
It compares the password in the password database with
the user's old password (entered to the first password
module in the stack). If the passwords do not match,
or if no password has been entered, it quits and does
not prompt the user for the old password. It also
attempts to use the new password (entered to the first
password module in the stack) as the new password for
this module. If the new password fails, it quits and
does not prompt the user for a new password.
try_first_pass
It compares the password in the password database with
the user's old password (entered to the first password
module in the stack). If the passwords do not match,
or if no password has been entered, it prompts the
user for the old password. It also attempts to use
the new password (entered to the first password module
in the stack) as the new password for this module. If
the new password fails, it prompts the user for a new
password. If the user's password has expired, the
UNIX account module saves this information in the
authentication handle using pam_set_data(), with a
unique name, SUNW_UNIX_AUTHOK_DATA. The UNIX password
module retrieves this information from the authentica-
tion handle using pam_get_data() to determine whether
or not to force the user to update the user's pass-
word.
ATTRIBUTES
See attributes(5) for description of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT Level | MT-Safe with exceptions |
|_____________________________|_____________________________|
SEE ALSO
keylogin(1), pam(3PAM), pam_authenticate(3PAM),
pam_setcred(3PAM), syslog(3C), libpam(3LIB), pam.conf(4),
attributes(5)
NOTES
The interfaces in libpam() are MT-Safe only if each thread
within the multi-threaded application uses its own PAM han-
dle.
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