hosts.allow revision 45488 
1#
2# hosts.allow access control file for "tcp wrapped" apps.
3# $Id: hosts.allow,v 1.1 1999/03/28 10:47:26 markm Exp $
4#
5# NOTE: The hosts.deny file is not longer used.  Instead, put both 'allow'
6#       and 'deny' rules in the hosts.allow file.
7# see hosts_options(5) for the format of this file.
8# hosts_access(5) no longer fully applies.
9
10# This is an example! You will need to modify it for your specific
11# requirements!
12
13# Start by allowing everything (this prevents the rest of the file
14# from working, so remove it when you need protection).
15# The rules here work on a "First match wins" basis.
16ALL : ALL : allow
17
18# Wrapping sshd(8) is not normally a good idea, but if you
19# need to do it, here's how
20#sshd : .evil.cracker.example.com : deny 
21
22# Prevent those with no reverse DNS from connecting.
23ALL : PARANOID : RFC931 20 : deny
24
25# Allow anything from localhost
26ALL : localhost : allow
27ALL : my.machine.example.com : allow
28
29# Sendmail can help protect you against spammers and relay-rapers
30sendmail : localhost : allow
31sendmail : .nice.guy.example.com : allow
32sendmail : .evil.cracker.example.com : deny
33sendmail : ALL : allow
34
35# Portmapper is used for all RPC services; protect your NFS!
36portmap : localhost : allow
37portmap : .nice.guy.example.com : allow
38portmap : .evil.cracker.example.com : deny
39portmap : ALL : allow
40
41# Provide a small amount of protection for ftpd
42ftpd : localhost : allow
43ftpd : .nice.guy.example.com : allow
44ftpd : .evil.cracker.example.com : deny
45ftpd : ALL : allow
46
47# You need to be clever with finger; do _not_ backfinger!! You can easily
48# start a "finger war".
49fingerd : ALL \
50	: spawn (echo Finger. | \
51	 /usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \
52	: deny
53
54# The rest of the daemons are protected. Backfinger and log by email.
55ALL : ALL \
56	: severity auth.info : spawn (/usr/bin/safe_finger -l @%h | \
57	 /usr/bin/mail -s "tcpd\: %u@%h[%a] tried to use %d  (denied)" root) & \
58	: twist /bin/echo "You are not welcome to use %d from %h."
59