[MAN] group

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GROUP.CONF

Section: Linux-PAM Manual (5)
Updated: 09/19/2013
Index Return to Main Contents

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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.

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.  

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 user 'sword' is given access to games (through membership of the floppy group) after work hours.

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 ALSO

pam_group(8), pam.d(5), pam(7)  

AUTHOR

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

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Index

NAME

DESCRIPTION

EXAMPLES

SEE ALSO

AUTHOR

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GROUP

Section: Linux Programmer's Manual (5)
Updated: 2016-10-08
Index Return to Main Contents

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NAME

group - user group file  

DESCRIPTION

The /etc/group file is a text file that defines the groups on the system. There is one entry per line, with the following format:

group_name:password:GID:user_list

The fields are as follows:

group_name

the name of the group.

password

the (encrypted) group password. If this field is empty, no password is needed.

GID

the numeric group ID.

user_list

a list of the usernames that are members of this group, separated by commas.

 

FILES

/etc/group  

BUGS

As the 4.2BSD initgroups(3) man page says: no one seems to keep /etc/group up-to-date.  

SEE ALSO

chgrp(1), gpasswd(1), groups(1), login(1), newgrp(1), sg(1), getgrent(3), getgrnam(3), gshadow(5), passwd(5)  

COLOPHON

This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

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Index

NAME

DESCRIPTION

FILES

BUGS

SEE ALSO

COLOPHON

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This document was created by man2html, using the manual pages.
Time: 04:45:55 GMT, September 16, 2022