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GROUP.CONF(5) Linux-PAM Manual GROUP.CONF(5)
group.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:
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.
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.
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
pam_group(8), pam.d(5), pam(8)
pam_group was written by Andrew G. Morgan <morgan@kernel.org>.
This page is part of the linux-pam (Pluggable Authentication
Modules for Linux) project. Information about the project can be
found at ⟨http://www.linux-pam.org/⟩. If you have a bug report
for this manual page, see ⟨//www.linux-pam.org/⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/linux-pam/linux-pam.git⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-12-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Linux-PAM Manual 12/22/2023 GROUP.CONF(5)
Pages that refer to this page: pam_group(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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