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FreeBSD is a free computer operating system based on BSD UNIX originally. Many IT companies, like DeployIS is using it to provide an up-to-date, stable operating system.

pam_unix - UNIX PAM module

 

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

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.