hosts.allow revision 56585
120253Sjoerg# 220302Sjoerg# hosts.allow access control file for "tcp wrapped" applications. 320302Sjoerg# $FreeBSD: head/etc/hosts.allow 56585 2000-01-25 11:25:59Z obrien $ 420253Sjoerg# 520253Sjoerg# NOTE: The hosts.deny file is no longer used. 620253Sjoerg# Instead, put both 'allow' and 'deny' rules in the hosts.allow file. 720253Sjoerg# See hosts_options(5) for the format of this file. 820253Sjoerg# hosts_access(5) no longer fully applies. 920302Sjoerg 1020253Sjoerg# _____ _ _ 1120253Sjoerg# | ____| __ __ __ _ _ __ ___ _ __ | | ___ | | 1220253Sjoerg# | _| \ \/ / / _` | | '_ ` _ \ | '_ \ | | / _ \ | | 1320253Sjoerg# | |___ > < | (_| | | | | | | | | |_) | | | | __/ |_| 1420302Sjoerg# |_____| /_/\_\ \__,_| |_| |_| |_| | .__/ |_| \___| (_) 1520253Sjoerg# |_| 1620253Sjoerg# !!! This is an example! You will need to modify it for your specific 1720302Sjoerg# !!! requirements! 1820253Sjoerg 1920253Sjoerg 2020253Sjoerg# Start by allowing everything (this prevents the rest of the file 2120253Sjoerg# from working, so remove it when you need protection). 2220253Sjoerg# The rules here work on a "First match wins" basis. 2320253SjoergALL : ALL : allow 2420253Sjoerg 2544229Sdavidn# Wrapping sshd(8) is not normally a good idea, but if you 2620253Sjoerg# need to do it, here's how 2720253Sjoerg#sshd : .evil.cracker.example.com : deny 2830259Scharnier 2930259Scharnier# Prevent those with no reverse DNS from connecting. 3050479SpeterALL : PARANOID : RFC931 20 : deny 3130259Scharnier 3230259Scharnier# Allow anything from localhost 3330259ScharnierALL : localhost : allow 3430259ScharnierALL : my.machine.example.com : allow 3520253Sjoerg 3620253Sjoerg# Sendmail can help protect you against spammers and relay-rapers 3720253Sjoergsendmail : localhost : allow 3830259Scharniersendmail : .nice.guy.example.com : allow 3920253Sjoergsendmail : .evil.cracker.example.com : deny 4020555Sdavidnsendmail : ALL : allow 4120555Sdavidn 4220555Sdavidn# Exim is an alternative to sendmail, available in the ports tree 4364918Sgreenexim : localhost : allow 44242349Sbaptexim : .nice.guy.example.com : allow 45242349Sbaptexim : .evil.cracker.example.com : deny 46242349Sbaptexim : ALL : allow 4720253Sjoerg 4820253Sjoerg# Portmapper is used for all RPC services; protect your NFS! 4920253Sjoerg# (IP addresses rather than hostnames *MUST* be used here) 5023318Sacheportmap : localhost : allow 5122394Sdavidnportmap : .nice.guy.example.com : allow 5252512Sdavidnportmap : .evil.cracker.example.com : deny 5324214Sacheportmap : ALL : allow 54284111Sbapt 55284111Sbapt# Provide a small amount of protection for ftpd 5644386Sdavidnftpd : localhost : allow 5720253Sjoergftpd : .nice.guy.example.com : allow 5820253Sjoergftpd : .evil.cracker.example.com : deny 5920253Sjoergftpd : ALL : allow 6020253Sjoerg 6120253Sjoerg# You need to be clever with finger; do _not_ backfinger!! You can easily 6220253Sjoerg# start a "finger war". 6320253Sjoergfingerd : ALL \ 6420253Sjoerg : spawn (echo Finger. | \ 6520253Sjoerg /usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \ 6685145Sache : deny 6720253Sjoerg 68283961Sbapt# The rest of the daemons are protected. Backfinger and log by email. 69283961SbaptALL : ALL \ 70283961Sbapt : severity auth.info : spawn (/usr/bin/finger -l @%h | \ 71283961Sbapt /usr/bin/mail -s "tcpd\: %u@%h[%a] tried to use %d (denied)" root) & \ 72283961Sbapt : twist /bin/echo "You are not welcome to use %d from %h." 73283961Sbapt