hosts.allow revision 90319
1127608Stjr# 2127608Stjr# hosts.allow access control file for "tcp wrapped" applications. 3127608Stjr# $FreeBSD: head/etc/hosts.allow 90319 2002-02-06 20:39:36Z markm $ 4127608Stjr# 5127608Stjr# NOTE: The hosts.deny file is deprecated. 6127608Stjr# Place both 'allow' and 'deny' rules in the hosts.allow file. 7127608Stjr# See hosts_options(5) for the format of this file. 8127608Stjr# hosts_access(5) no longer fully applies. 9127608Stjr 10127608Stjr# _____ _ _ 11127608Stjr# | ____| __ __ __ _ _ __ ___ _ __ | | ___ | | 12127608Stjr# | _| \ \/ / / _` | | '_ ` _ \ | '_ \ | | / _ \ | | 13127608Stjr# | |___ > < | (_| | | | | | | | | |_) | | | | __/ |_| 14127608Stjr# |_____| /_/\_\ \__,_| |_| |_| |_| | .__/ |_| \___| (_) 15127608Stjr# |_| 16127608Stjr# !!! This is an example! You will need to modify it for your specific 17127608Stjr# !!! requirements! 18127608Stjr 19127608Stjr 20127608Stjr# Start by allowing everything (this prevents the rest of the file 21127608Stjr# from working, so remove it when you need protection). 22127608Stjr# The rules here work on a "First match wins" basis. 23127608StjrALL : ALL : allow 24127608Stjr 25127608Stjr# Wrapping sshd(8) is not normally a good idea, but if you 26127608Stjr# need to do it, here's how 27127608Stjr#sshd : .evil.cracker.example.com : deny 28196820Sdes 29127608Stjr# Protect against simple DNS spoofing attacks by checking that the 30127608Stjr# forward and reverse records for the remote host match. If a mismatch 31127608Stjr# occurs, access is denied, and any positive ident response within 32127608Stjr# 20 seconds is logged. No protection is afforded against DNS poisoning, 33127608Stjr# IP spoofing or more complicated attacks. Hosts with no reverse DNS 34127608Stjr# pass this rule. 35127608StjrALL : PARANOID : RFC931 20 : deny 36127608Stjr 37127608Stjr# Allow anything from localhost. Note that an IP address (not a host 38127608Stjr# name) *MUST* be specified for rpcbind(8). 39127608StjrALL : localhost 127.0.0.1 : allow 40127608StjrALL : my.machine.example.com 192.0.2.35 : allow 41127608Stjr 42127608Stjr# To use IPv6 addresses you must enclose them in []'s 43127608StjrALL : [fe80::%fxp0]/10 : allow 44127608StjrALL : [fe80::]/10 : deny 45127608StjrALL : [3ffe:fffe:2:1:2:3:4:3fe1] : deny 46127608StjrALL : [3ffe:fffe:2:1::]/64 : allow 47127608Stjr 48127608Stjr# Sendmail can help protect you against spammers and relay-rapers 49127608Stjrsendmail : localhost : allow 50127608Stjrsendmail : .nice.guy.example.com : allow 51127608Stjrsendmail : .evil.cracker.example.com : deny 52127608Stjrsendmail : ALL : allow 53127608Stjr 54127608Stjr# Exim is an alternative to sendmail, available in the ports tree 55127608Stjrexim : localhost : allow 56127608Stjrexim : .nice.guy.example.com : allow 57127608Stjrexim : .evil.cracker.example.com : deny 58exim : ALL : allow 59 60# Rpcbind is used for all RPC services; protect your NFS! 61# (IP addresses rather than hostnames *MUST* be used here) 62rpcbind : 192.0.2.32/255.255.255.224 : allow 63rpcbind : 192.0.2.96/255.255.255.224 : allow 64rpcbind : ALL : deny 65 66# NIS master server. Only local nets should have access 67ypserv : localhost : allow 68ypserv : .unsafe.my.net.example.com : deny 69ypserv : .my.net.example.com : allow 70ypserv : ALL : deny 71 72# Provide a small amount of protection for ftpd 73ftpd : localhost : allow 74ftpd : .nice.guy.example.com : allow 75ftpd : .evil.cracker.example.com : deny 76ftpd : ALL : allow 77 78# You need to be clever with finger; do _not_ backfinger!! You can easily 79# start a "finger war". 80fingerd : ALL \ 81 : spawn (echo Finger. | \ 82 /usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \ 83 : deny 84 85# The rest of the daemons are protected. 86ALL : ALL \ 87 : severity auth.info \ 88 : twist /bin/echo "You are not welcome to use %d from %h." 89