hosts.allow revision 45088 
1#
2# hosts.allow access control file for "tcp wrapped" apps.
3# $Id$
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).
15ALL : ALL : allow
16
17# Wrapping sshd(8) is not normally a good idea, but if you
18# need to do it, here's how
19#sshd : .evil.hacker.org : deny 
20
21# Prevent those with no reverse DNS from connecting.
22ALL : PARANOID : RFC931 20 : deny
23
24# Allow anything from localhost
25ALL : localhost : allow
26
27# Sendmail can help protect you against spammers and relay-rapers
28sendmail : localhost : allow
29sendmail : .mydomain.com : allow
30sendmail : .evil.spamnest.org : deny
31sendmail : ALL : allow
32
33# Provide a small amount of protection for ftpd
34ftpd : .warez.d00d.org : deny
35ftpd : ALL : allow
36
37# You need to be clever with finger; do _not_ backfinger!! You can easily
38# start a "finger war".
39fingerd : ALL \
40	: spawn (echo Finger. | \
41	 /usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \
42	: deny
43
44# The rest of the daemons are protected. Backfinger and log by email.
45ALL : ALL \
46	: severity auth.info : spawn (/usr/bin/safe_finger -l @%h | \
47	 /usr/bin/mail -s "tcpd\: %u@%h[%a] tried to use %d  (denied)" root) & \
48	: twist /bin/echo "You are not welcome to use %d from %h."
49