GROUP.CONF(5) Linux-PAM Manual GROUP.CONF(5)NAMEgroup.conf - configuration file for the pam_group module
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:
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
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.
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
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.
These are some example lines which might be specified in
Running 'xsh' on tty* (any ttyXXX device), the user 'us' is given
access to the floppy (through membership of the floppy group)
Running 'xsh' on tty* (any ttyXXX device), the user 'sword' is given
access to games (through membership of the floppy group) after work
xsh; tty* ;sword;!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 ALSOpam_group(8), pam.d(5), pam(7)AUTHOR
pam_group was written by Andrew G. Morgan <email@example.com>.
Linux-PAM Manual 09/19/2013 GROUP.CONF(5)