hosts.allow revision 74537
145088Smarkm# 256585Sobrien# hosts.allow access control file for "tcp wrapped" applications. 350472Speter# $FreeBSD: head/etc/hosts.allow 74537 2001-03-20 21:02:39Z alfred $ 445088Smarkm# 558750Scwt# NOTE: The hosts.deny file is deprecated. 658750Scwt# Place both 'allow' and 'deny' rules in the hosts.allow file. 756585Sobrien# See hosts_options(5) for the format of this file. 856585Sobrien# hosts_access(5) no longer fully applies. 945088Smarkm 1053685Sobrien# _____ _ _ 1153685Sobrien# | ____| __ __ __ _ _ __ ___ _ __ | | ___ | | 1253685Sobrien# | _| \ \/ / / _` | | '_ ` _ \ | '_ \ | | / _ \ | | 1353685Sobrien# | |___ > < | (_| | | | | | | | | |_) | | | | __/ |_| 1453685Sobrien# |_____| /_/\_\ \__,_| |_| |_| |_| | .__/ |_| \___| (_) 1553685Sobrien# |_| 1653685Sobrien# !!! This is an example! You will need to modify it for your specific 1753685Sobrien# !!! requirements! 1845088Smarkm 1953685Sobrien 2045088Smarkm# Start by allowing everything (this prevents the rest of the file 2145088Smarkm# from working, so remove it when you need protection). 2245488Smarkm# The rules here work on a "First match wins" basis. 2345088SmarkmALL : ALL : allow 2445088Smarkm 2545088Smarkm# Wrapping sshd(8) is not normally a good idea, but if you 2645088Smarkm# need to do it, here's how 2745488Smarkm#sshd : .evil.cracker.example.com : deny 2845088Smarkm 2945088Smarkm# Prevent those with no reverse DNS from connecting. 3045088SmarkmALL : PARANOID : RFC931 20 : deny 3145088Smarkm 3260031Ssheldonh# Allow anything from localhost. Note that an IP address (not a host 3374537Salfred# name) *MUST* be specified for rpcbind(8). 3460031SsheldonhALL : localhost 127.0.0.1 : allow 3560031SsheldonhALL : my.machine.example.com 192.0.2.35 : allow 3645088Smarkm 3763515Sume# To use IPv6 addresses you must enclose them in []'s 3863515SumeALL : [fe80::%fxp0]/10 : allow 3963515SumeALL : [fe80::]/10 : deny 4063515SumeALL : [3ffe:fffe:2:1:2:3:4:3fe1] : deny 4163515SumeALL : [3ffe:fffe:2:1::]/64 : allow 4263515Sume 4345088Smarkm# Sendmail can help protect you against spammers and relay-rapers 4445088Smarkmsendmail : localhost : allow 4545488Smarkmsendmail : .nice.guy.example.com : allow 4645488Smarkmsendmail : .evil.cracker.example.com : deny 4745088Smarkmsendmail : ALL : allow 4845088Smarkm 4949394Ssheldonh# Exim is an alternative to sendmail, available in the ports tree 5049394Ssheldonhexim : localhost : allow 5149394Ssheldonhexim : .nice.guy.example.com : allow 5249394Ssheldonhexim : .evil.cracker.example.com : deny 5349394Ssheldonhexim : ALL : allow 5449394Ssheldonh 5545488Smarkm# Portmapper is used for all RPC services; protect your NFS! 5653685Sobrien# (IP addresses rather than hostnames *MUST* be used here) 5774537Salfredrpcbind : 192.0.2.32/255.255.255.224 : allow 5874537Salfredrpcbind : 192.0.2.96/255.255.255.224 : allow 5974537Salfredrpcbind : ALL : deny 6045488Smarkm 6145088Smarkm# Provide a small amount of protection for ftpd 6245488Smarkmftpd : localhost : allow 6345488Smarkmftpd : .nice.guy.example.com : allow 6445488Smarkmftpd : .evil.cracker.example.com : deny 6545088Smarkmftpd : ALL : allow 6645088Smarkm 6745088Smarkm# You need to be clever with finger; do _not_ backfinger!! You can easily 6845088Smarkm# start a "finger war". 6945088Smarkmfingerd : ALL \ 7045088Smarkm : spawn (echo Finger. | \ 7145088Smarkm /usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \ 7245088Smarkm : deny 7345088Smarkm 7457284Sjkh# The rest of the daemons are protected. 7545088SmarkmALL : ALL \ 7657284Sjkh : severity auth.info \ 7745088Smarkm : twist /bin/echo "You are not welcome to use %d from %h." 78