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PAM_UNIX(8)		  BSD System Manager's Manual		   PAM_UNIX(8)

NAME
     pam_unix — UNIX PAM module

SYNOPSIS
     [service-name] module-type control-flag pam_unix [options]

DESCRIPTION
     The UNIX authentication service module for PAM, pam_unix provides func‐
     tionality for three PAM categories: authentication, account management,
     and password management.  In terms of the module-type parameter, they are
     the “auth”, “account”, and “password” features.  It also provides a null
     function for session management.

   UNIX Authentication Module
     The UNIX authentication component provides functions to verify the iden‐
     tity of a user (pam_sm_authenticate()), which obtains the relevant
     passwd(5) entry.  It prompts the user for a password and verifies that
     this is correct with crypt(3).

     The following options may be passed to the authentication module:

     debug	     syslog(3) debugging information at LOG_DEBUG level.

     use_first_pass  If the authentication module is not the first in the
		     stack, and a previous module obtained the user's pass‐
		     word, that password is used to authenticate the user.  If
		     this fails, the authentication module returns failure
		     without prompting the user for a password.	 This option
		     has no effect if the authentication module is the first
		     in the stack, or if no previous modules obtained the
		     user's password.

     try_first_pass  This option is similar to the use_first_pass option,
		     except that if the previously obtained password fails,
		     the user is prompted for another password.

     auth_as_self    This option will require the user to authenticate them‐
		     selves as themselves, not as the account they are
		     attempting to access.  This is primarily for services
		     like su(1), where the user's ability to retype their own
		     password might be deemed sufficient.

     nullok	     If the password database has no password for the entity
		     being authenticated, then this option will forgo password
		     prompting, and silently allow authentication to succeed.

     local_pass	     Use only the local password database, even if NIS is in
		     use.  This will cause an authentication failure if the
		     system is configured to only use NIS.

     nis_pass	     Use only the NIS password database.  This will cause an
		     authentication failure if the system is not configured to
		     use NIS.

   UNIX Account Management Module
     The UNIX account management component provides a function to perform
     account management, pam_sm_acct_mgmt().  The function verifies that the
     authenticated user is allowed to log into the local user account by
     checking the following criteria:

	   -   locked status of the account compatible with pw(8) lock;

	   -   the password expiry date from passwd(5);

	   -   login.conf(5) restrictions on the remote host, login time, and
	       tty.

     The following options may be passed to the management module:

     debug	     syslog(3) debugging information at LOG_DEBUG level.

   UNIX Password Management Module
     The UNIX password management component provides a function to perform
     password management, pam_sm_chauthtok().  The function changes the user's
     password.

     The following options may be passed to the password module:

     debug	     syslog(3) debugging information at LOG_DEBUG level.

     no_warn	     suppress warning messages to the user.  These messages
		     include reasons why the user's authentication attempt was
		     declined.

     local_pass	     forces the password module to change a local password in
		     favour of a NIS one.

     nis_pass	     forces the password module to change a NIS password in
		     favour of a local one.

FILES
     /etc/master.passwd	 default UNIX password database.

SEE ALSO
     passwd(1), getlogin(2), crypt(3), getpwent(3), syslog(3),
     nsswitch.conf(5), passwd(5), pam(8), pw(8), yp(8)

BSD				 June 20, 2009				   BSD
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