hosts.allow revision 63515
1# 2# hosts.allow access control file for "tcp wrapped" applications. 3# $FreeBSD: head/etc/hosts.allow 63515 2000-07-19 13:05:58Z ume $ 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# Prevent those with no reverse DNS from connecting. 30ALL : PARANOID : RFC931 20 : deny 31 32# Allow anything from localhost. Note that an IP address (not a host 33# name) *MUST* be specified for portmap(8). 34ALL : localhost 127.0.0.1 : allow 35ALL : my.machine.example.com 192.0.2.35 : allow 36 37# To use IPv6 addresses you must enclose them in []'s 38ALL : [fe80::%fxp0]/10 : allow 39ALL : [fe80::]/10 : deny 40ALL : [3ffe:fffe:2:1:2:3:4:3fe1] : deny 41ALL : [3ffe:fffe:2:1::]/64 : allow 42 43# Sendmail can help protect you against spammers and relay-rapers 44sendmail : localhost : allow 45sendmail : .nice.guy.example.com : allow 46sendmail : .evil.cracker.example.com : deny 47sendmail : ALL : allow 48 49# Exim is an alternative to sendmail, available in the ports tree 50exim : localhost : allow 51exim : .nice.guy.example.com : allow 52exim : .evil.cracker.example.com : deny 53exim : ALL : allow 54 55# Portmapper is used for all RPC services; protect your NFS! 56# (IP addresses rather than hostnames *MUST* be used here) 57portmap : 192.0.2.32/255.255.255.224 : allow 58portmap : 192.0.2.96/255.255.255.224 : allow 59portmap : ALL : deny 60 61# Provide a small amount of protection for ftpd 62ftpd : localhost : allow 63ftpd : .nice.guy.example.com : allow 64ftpd : .evil.cracker.example.com : deny 65ftpd : ALL : allow 66 67# You need to be clever with finger; do _not_ backfinger!! You can easily 68# start a "finger war". 69fingerd : ALL \ 70 : spawn (echo Finger. | \ 71 /usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \ 72 : deny 73 74# The rest of the daemons are protected. 75ALL : ALL \ 76 : severity auth.info \ 77 : twist /bin/echo "You are not welcome to use %d from %h." 78