hosts.allow revision 57284
1# 2# hosts.allow access control file for "tcp wrapped" applications. 3# $FreeBSD: head/etc/hosts.allow 57284 2000-02-17 04:52:23Z jkh $ 4# 5# NOTE: The hosts.deny file is no longer used. 6# Instead, put 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# Prevent those with no reverse DNS from connecting. 30ALL : PARANOID : RFC931 20 : deny 31 32# Allow anything from localhost 33ALL : localhost : allow 34ALL : my.machine.example.com : allow 35 36# Sendmail can help protect you against spammers and relay-rapers 37sendmail : localhost : allow 38sendmail : .nice.guy.example.com : allow 39sendmail : .evil.cracker.example.com : deny 40sendmail : ALL : allow 41 42# Exim is an alternative to sendmail, available in the ports tree 43exim : localhost : allow 44exim : .nice.guy.example.com : allow 45exim : .evil.cracker.example.com : deny 46exim : ALL : allow 47 48# Portmapper is used for all RPC services; protect your NFS! 49# (IP addresses rather than hostnames *MUST* be used here) 50portmap : localhost : allow 51portmap : .nice.guy.example.com : allow 52portmap : .evil.cracker.example.com : deny 53portmap : ALL : allow 54 55# Provide a small amount of protection for ftpd 56ftpd : localhost : allow 57ftpd : .nice.guy.example.com : allow 58ftpd : .evil.cracker.example.com : deny 59ftpd : ALL : allow 60 61# You need to be clever with finger; do _not_ backfinger!! You can easily 62# start a "finger war". 63fingerd : ALL \ 64 : spawn (echo Finger. | \ 65 /usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \ 66 : deny 67 68# The rest of the daemons are protected. 69ALL : ALL \ 70 : severity auth.info \ 71 : twist /bin/echo "You are not welcome to use %d from %h." 72