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NetBSD 6.1.5 - man page for pam_unix (netbsd section 8)

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 provides functionality for two PAM cate-
     gories: authentication and account management.  In terms of the module-type parameter, they
     are the ``auth'' and ``account'' features.  It also provides a null function for session
     management.

   UNIX Authentication Module
     The UNIX authentication component provides functions to verify the identity 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 password, 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 authen-
		     tication 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 pre-
		     viously obtained password fails, the user is prompted for another password.

     auth_as_self    This option will require the user to authenticate himself as the user given
		     by getlogin(2), 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 authenti-
		     cation to succeed.

   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 login
     to the local user account by checking the password expiry date.

     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 account 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.

     passwd_db=name  Change the user's password only the specified password database.  Valid
		     password database names are:

		     files  local password file

		     nis    NIS password database

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),
     nis(8), pam(8)

BSD					February 26, 2005				      BSD


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