1GROUP.CONF(5) Linux-PAM Manual GROUP.CONF(5)
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6 group.conf - configuration file for the pam_group module
7
9 The pam_group PAM module does not authenticate the user, but instead it
10 grants group memberships (in the credential setting phase of the
11 authentication module) to the user. Such memberships are based on the
12 service they are applying for.
13 For this module to function correctly there must be a correctly
15 formatted /etc/security/group.conf file present. White spaces are
16 ignored and lines maybe extended with '\' (escaped newlines). Text
17 following a '#' is ignored to the end of the line.
18 The syntax of the lines is as follows:
20 services;ttys;users;times;groups
22 The first field, the services field, is a logic list of PAM service
24 names that the rule applies to.
25 The second field, the tty field, is a logic list of terminal names that
27 this rule applies to.
28 The third field, the users field, is a logic list of users, or a UNIX
30 group, or a netgroup of users to whom this rule applies. Group names
31 are preceded by a '%' symbol, while netgroup names are preceded by a
32 '@' symbol.
33 A logic list namely means individual tokens that are optionally
35 prefixed with '!' (logical not) and separated with '&' (logical and)
36 and '|' (logical or).
37 For these items the simple wildcard '*' may be used only once. With
39 UNIX groups or netgroups no wildcards or logic operators are allowed.
40 The times field is used to indicate "when" these groups are to be given
42 to the user. The format here is a logic list of day/time-range entries.
43 The days are specified by a sequence of two character entries, MoTuSa
44 for example is Monday Tuesday and Saturday. Note that repeated days are
45 unset MoMo = no day, and MoWk = all weekdays bar Monday. The two
46 character combinations accepted are Mo Tu We Th Fr Sa Su Wk Wd Al, the
47 last two being week-end days and all 7 days of the week respectively.
48 As a final example, AlFr means all days except Friday.
49 Each day/time-range can be prefixed with a '!' to indicate "anything
51 but". The time-range part is two 24-hour times HHMM, separated by a
52 hyphen, indicating the start and finish time (if the finish time is
53 smaller than the start time it is deemed to apply on the following
54 day).
55 The groups field is a comma or space separated list of groups that the
57 user inherits membership of. These groups are added if the previous
58 fields are satisfied by the user's request.
59 For a rule to be active, ALL of service+ttys+users must be satisfied by
61 the applying process.
62
64 These are some example lines which might be specified in
65 /etc/security/group.conf.
66 Running 'xsh' on tty* (any ttyXXX device), the user 'us' is given
68 access to the floppy (through membership of the floppy group)
69 xsh;tty*&!ttyp*;us;Al0000-2400;floppy
71 Running 'xsh' on tty* (any ttyXXX device), the users 'sword', 'pike'
73 and 'shield' are given access to games (through membership of the
74 floppy group) after work hours.
75 xsh; tty* ;sword|pike|shield;!Wk0900-1800;games, sound
77 xsh; tty* ;*;Al0900-1800;floppy
78 Any member of the group 'admin' running 'xsh' on tty*, is granted
81 access (at any time) to the group 'plugdev'
82 xsh; tty* ;%admin;Al0000-2400;plugdev
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87 pam_group(8), pam.d(5), pam(8)
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90 pam_group was written by Andrew G. Morgan <morgan@kernel.org>.
91Linux-PAM Manual 09/03/2021 GROUP.CONF(5)