Initial import from FreeBSD RELENG_4:
[dragonfly.git] / etc / hosts.allow
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1#
2# hosts.allow access control file for "tcp wrapped" applications.
3# $FreeBSD: src/etc/hosts.allow,v 1.8.2.7 2002/04/17 19:44:22 dougb Exp $
4#
5# NOTE: The hosts.deny file is deprecated.
6# Place both 'allow' 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# _____ _ _
11# | ____| __ __ __ _ _ __ ___ _ __ | | ___ | |
12# | _| \ \/ / / _` | | '_ ` _ \ | '_ \ | | / _ \ | |
13# | |___ > < | (_| | | | | | | | | |_) | | | | __/ |_|
14# |_____| /_/\_\ \__,_| |_| |_| |_| | .__/ |_| \___| (_)
15# |_|
16# !!! This is an example! You will need to modify it for your specific
17# !!! requirements!
18
19
20# Start by allowing everything (this prevents the rest of the file
21# from working, so remove it when you need protection).
22# The rules here work on a "First match wins" basis.
23ALL : ALL : allow
24
25# Wrapping sshd(8) is not normally a good idea, but if you
26# need to do it, here's how
27#sshd : .evil.cracker.example.com : deny
28
29# Protect against simple DNS spoofing attacks by checking that the
30# forward and reverse records for the remote host match. If a mismatch
31# occurs, access is denied, and any positive ident response within
32# 20 seconds is logged. No protection is afforded against DNS poisoning,
33# IP spoofing or more complicated attacks. Hosts with no reverse DNS
34# pass this rule.
35ALL : PARANOID : RFC931 20 : deny
36
37# Allow anything from localhost. Note that an IP address (not a host
38# name) *MUST* be specified for portmap(8).
39ALL : localhost 127.0.0.1 : allow
40ALL : my.machine.example.com 192.0.2.35 : allow
41
42# To use IPv6 addresses you must enclose them in []'s
43ALL : [fe80::%fxp0]/10 : allow
44ALL : [fe80::]/10 : deny
45ALL : [3ffe:fffe:2:1:2:3:4:3fe1] : deny
46ALL : [3ffe:fffe:2:1::]/64 : allow
47
48# Sendmail can help protect you against spammers and relay-rapers
49sendmail : localhost : allow
50sendmail : .nice.guy.example.com : allow
51sendmail : .evil.cracker.example.com : deny
52sendmail : ALL : allow
53
54# Exim is an alternative to sendmail, available in the ports tree
55exim : localhost : allow
56exim : .nice.guy.example.com : allow
57exim : .evil.cracker.example.com : deny
58exim : ALL : allow
59
60# Portmapper is used for all RPC services; protect your NFS!
61# (IP addresses rather than hostnames *MUST* be used here)
62portmap : 192.0.2.32/255.255.255.224 : allow
63portmap : 192.0.2.96/255.255.255.224 : allow
64portmap : ALL : deny
65
66# Provide a small amount of protection for ftpd
67ftpd : localhost : allow
68ftpd : .nice.guy.example.com : allow
69ftpd : .evil.cracker.example.com : deny
70ftpd : ALL : allow
71
72# You need to be clever with finger; do _not_ backfinger!! You can easily
73# start a "finger war".
74fingerd : ALL \
75 : spawn (echo Finger. | \
76 /usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \
77 : deny
78
79# The rest of the daemons are protected.
80ALL : ALL \
81 : severity auth.info \
82 : twist /bin/echo "You are not welcome to use %d from %h."