xref: /freebsd/usr.bin/login/login.access (revision d0b2dbfa)
1d3bb1208SEmmanuel Vadot#
2d3bb1208SEmmanuel Vadot# Login access control table.
3d3bb1208SEmmanuel Vadot#
4d3bb1208SEmmanuel Vadot# When someone logs in, the table is scanned for the first entry that
5d3bb1208SEmmanuel Vadot# matches the (user, host) combination, or, in case of non-networked
6d3bb1208SEmmanuel Vadot# logins, the first entry that matches the (user, tty) combination.  The
7d3bb1208SEmmanuel Vadot# permissions field of that table entry determines whether the login will
8d3bb1208SEmmanuel Vadot# be accepted or refused.
9d3bb1208SEmmanuel Vadot#
10d3bb1208SEmmanuel Vadot# Format of the login access control table is three fields separated by a
11d3bb1208SEmmanuel Vadot# ":" character:
12d3bb1208SEmmanuel Vadot#
13d3bb1208SEmmanuel Vadot# 	permission : users : origins
14d3bb1208SEmmanuel Vadot#
15d3bb1208SEmmanuel Vadot# The first field should be a "+" (access granted) or "-" (access denied)
16d3bb1208SEmmanuel Vadot# character. The second field should be a list of one or more login names,
17d3bb1208SEmmanuel Vadot# group names, or ALL (always matches).  The third field should be a list
18d3bb1208SEmmanuel Vadot# of one or more tty names (for non-networked logins), host names, domain
19d3bb1208SEmmanuel Vadot# names (begin with "."), host addresses, internet network numbers (end
20d3bb1208SEmmanuel Vadot# with "."), ALL (always matches) or LOCAL (matches any string that does
21d3bb1208SEmmanuel Vadot# not contain a "." character). If you run NIS you can use @netgroupname
22d3bb1208SEmmanuel Vadot# in host or user patterns.
23d3bb1208SEmmanuel Vadot#
24d3bb1208SEmmanuel Vadot# The EXCEPT operator makes it possible to write very compact rules.
25d3bb1208SEmmanuel Vadot#
26d3bb1208SEmmanuel Vadot# The group file is searched only when a name does not match that of the
27d3bb1208SEmmanuel Vadot# logged-in user. Only groups are matched in which users are explicitly
28d3bb1208SEmmanuel Vadot# listed: the program does not look at a user's primary group id value.
29d3bb1208SEmmanuel Vadot#
30d3bb1208SEmmanuel Vadot##############################################################################
31d3bb1208SEmmanuel Vadot#
32d3bb1208SEmmanuel Vadot# Disallow console logins to all but a few accounts.
33d3bb1208SEmmanuel Vadot#
34d3bb1208SEmmanuel Vadot#-:ALL EXCEPT wheel shutdown sync:console
35d3bb1208SEmmanuel Vadot#
36d3bb1208SEmmanuel Vadot# Disallow non-local logins to privileged accounts (group wheel).
37d3bb1208SEmmanuel Vadot#
38d3bb1208SEmmanuel Vadot#-:wheel:ALL EXCEPT LOCAL .win.tue.nl
39d3bb1208SEmmanuel Vadot#
40d3bb1208SEmmanuel Vadot# Some accounts are not allowed to login from anywhere:
41d3bb1208SEmmanuel Vadot#
42d3bb1208SEmmanuel Vadot#-:wsbscaro wsbsecr wsbspac wsbsym wscosor wstaiwde:ALL
43d3bb1208SEmmanuel Vadot#
44d3bb1208SEmmanuel Vadot# All other accounts are allowed to login from anywhere.
45d3bb1208SEmmanuel Vadot#
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