GROUP.CONF(5)             (06/08/2020)              GROUP.CONF(5)

     NAME
          group.conf - configuration file for the pam_group module

     DESCRIPTION
          The pam_group PAM module does not authenticate the user, but
          instead it grants group memberships (in the credential
          setting phase of the authentication module) to the user.
          Such memberships are based on the service they are applying
          for.

          For this module to function correctly there must be a
          correctly formatted /etc/security/group.conf file present.
          White spaces are ignored and lines maybe extended with '\'
          (escaped newlines). Text following a '#' is ignored to the
          end of the line.

          The syntax of the lines is as follows:

          services;ttys;users;times;groups

          The first field, the services field, is a logic list of PAM
          service names that the rule applies to.

          The second field, the tty field, is a logic list of terminal
          names that this rule applies to.

          The third field, the users field, is a logic list of users,
          or a UNIX group, or a netgroup of users to whom this rule
          applies. Group names are preceded by a '%' symbol, while
          netgroup names are preceded by a '@' symbol.

          A logic list namely means individual tokens that are
          optionally prefixed with '!' (logical not) and separated
          with '&' (logical and) and '|' (logical or).

          For these items the simple wildcard '*' may be used only
          once. With UNIX groups or netgroups no wildcards or logic
          operators are allowed.

          The times field is used to indicate "when" these groups are
          to be given to the user. The format here is a logic list of
          day/time-range entries. The days are specified by a sequence
          of two character entries, MoTuSa for example is Monday
          Tuesday and Saturday. Note that repeated days are unset MoMo
          = no day, and MoWk = all weekdays bar Monday. The two
          character combinations accepted are Mo Tu We Th Fr Sa Su Wk
          Wd Al, the last two being week-end days and all 7 days of
          the week respectively. As a final example, AlFr means all
          days except Friday.

     Page 1                  Linux-PAM Manual        (printed 5/24/22)

     GROUP.CONF(5)             (06/08/2020)              GROUP.CONF(5)

          Each day/time-range can be prefixed with a '!' to indicate
          "anything but". The time-range part is two 24-hour times
          HHMM, separated by a hyphen, indicating the start and finish
          time (if the finish time is smaller than the start time it
          is deemed to apply on the following day).

          The groups field is a comma or space separated list of
          groups that the user inherits membership of. These groups
          are added if the previous fields are satisfied by the user's
          request.

          For a rule to be active, ALL of service+ttys+users must be
          satisfied by the applying process.

     EXAMPLES
          These are some example lines which might be specified in
          /etc/security/group.conf.

          Running 'xsh' on tty* (any ttyXXX device), the user 'us' is
          given access to the floppy (through membership of the floppy
          group)

              xsh;tty*&!ttyp*;us;Al0000-2400;floppy

          Running 'xsh' on tty* (any ttyXXX device), the users
          'sword', 'pike' and 'shield' are given access to games
          (through membership of the floppy group) after work hours.

              xsh; tty* ;sword|pike|shield;!Wk0900-1800;games, sound
              xsh; tty* ;*;Al0900-1800;floppy

          Any member of the group 'admin' running 'xsh' on tty*, is
          granted access (at any time) to the group 'plugdev'

              xsh; tty* ;%admin;Al0000-2400;plugdev

     SEE ALSO
          pam_group(8), pam.d(5), pam(7)

     AUTHOR
          pam_group was written by Andrew G. Morgan
          <morgan@kernel.org>.

     Page 2                  Linux-PAM Manual        (printed 5/24/22)