xref: /freebsd/usr.bin/login/login.access (revision d0b2dbfa0ecf2bbc9709efc5e20baf8e4b44bbbf)
1*d3bb1208SEmmanuel Vadot#
2*d3bb1208SEmmanuel Vadot# Login access control table.
3*d3bb1208SEmmanuel Vadot#
4*d3bb1208SEmmanuel Vadot# When someone logs in, the table is scanned for the first entry that
5*d3bb1208SEmmanuel Vadot# matches the (user, host) combination, or, in case of non-networked
6*d3bb1208SEmmanuel Vadot# logins, the first entry that matches the (user, tty) combination.  The
7*d3bb1208SEmmanuel Vadot# permissions field of that table entry determines whether the login will
8*d3bb1208SEmmanuel Vadot# be accepted or refused.
9*d3bb1208SEmmanuel Vadot#
10*d3bb1208SEmmanuel Vadot# Format of the login access control table is three fields separated by a
11*d3bb1208SEmmanuel Vadot# ":" character:
12*d3bb1208SEmmanuel Vadot#
13*d3bb1208SEmmanuel Vadot# 	permission : users : origins
14*d3bb1208SEmmanuel Vadot#
15*d3bb1208SEmmanuel Vadot# The first field should be a "+" (access granted) or "-" (access denied)
16*d3bb1208SEmmanuel Vadot# character. The second field should be a list of one or more login names,
17*d3bb1208SEmmanuel Vadot# group names, or ALL (always matches).  The third field should be a list
18*d3bb1208SEmmanuel Vadot# of one or more tty names (for non-networked logins), host names, domain
19*d3bb1208SEmmanuel Vadot# names (begin with "."), host addresses, internet network numbers (end
20*d3bb1208SEmmanuel Vadot# with "."), ALL (always matches) or LOCAL (matches any string that does
21*d3bb1208SEmmanuel Vadot# not contain a "." character). If you run NIS you can use @netgroupname
22*d3bb1208SEmmanuel Vadot# in host or user patterns.
23*d3bb1208SEmmanuel Vadot#
24*d3bb1208SEmmanuel Vadot# The EXCEPT operator makes it possible to write very compact rules.
25*d3bb1208SEmmanuel Vadot#
26*d3bb1208SEmmanuel Vadot# The group file is searched only when a name does not match that of the
27*d3bb1208SEmmanuel Vadot# logged-in user. Only groups are matched in which users are explicitly
28*d3bb1208SEmmanuel Vadot# listed: the program does not look at a user's primary group id value.
29*d3bb1208SEmmanuel Vadot#
30*d3bb1208SEmmanuel Vadot##############################################################################
31*d3bb1208SEmmanuel Vadot#
32*d3bb1208SEmmanuel Vadot# Disallow console logins to all but a few accounts.
33*d3bb1208SEmmanuel Vadot#
34*d3bb1208SEmmanuel Vadot#-:ALL EXCEPT wheel shutdown sync:console
35*d3bb1208SEmmanuel Vadot#
36*d3bb1208SEmmanuel Vadot# Disallow non-local logins to privileged accounts (group wheel).
37*d3bb1208SEmmanuel Vadot#
38*d3bb1208SEmmanuel Vadot#-:wheel:ALL EXCEPT LOCAL .win.tue.nl
39*d3bb1208SEmmanuel Vadot#
40*d3bb1208SEmmanuel Vadot# Some accounts are not allowed to login from anywhere:
41*d3bb1208SEmmanuel Vadot#
42*d3bb1208SEmmanuel Vadot#-:wsbscaro wsbsecr wsbspac wsbsym wscosor wstaiwde:ALL
43*d3bb1208SEmmanuel Vadot#
44*d3bb1208SEmmanuel Vadot# All other accounts are allowed to login from anywhere.
45*d3bb1208SEmmanuel Vadot#
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