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89 lines
3.1 KiB
Plaintext
89 lines
3.1 KiB
Plaintext
#
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# hosts.allow access control file for "tcp wrapped" applications.
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# $FreeBSD$
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#
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# NOTE: The hosts.deny file is deprecated.
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# Place both 'allow' and 'deny' rules in the hosts.allow file.
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# See hosts_options(5) for the format of this file.
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# hosts_access(5) no longer fully applies.
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# _____ _ _
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# | ____| __ __ __ _ _ __ ___ _ __ | | ___ | |
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# | _| \ \/ / / _` | | '_ ` _ \ | '_ \ | | / _ \ | |
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# | |___ > < | (_| | | | | | | | | |_) | | | | __/ |_|
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# |_____| /_/\_\ \__,_| |_| |_| |_| | .__/ |_| \___| (_)
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# |_|
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# !!! This is an example! You will need to modify it for your specific
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# !!! requirements!
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# Start by allowing everything (this prevents the rest of the file
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# from working, so remove it when you need protection).
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# The rules here work on a "First match wins" basis.
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ALL : ALL : allow
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# Wrapping sshd(8) is not normally a good idea, but if you
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# need to do it, here's how
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#sshd : .evil.cracker.example.com : deny
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# Protect against simple DNS spoofing attacks by checking that the
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# forward and reverse records for the remote host match. If a mismatch
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# occurs, access is denied, and any positive ident response within
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# 20 seconds is logged. No protection is afforded against DNS poisoning,
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# IP spoofing or more complicated attacks. Hosts with no reverse DNS
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# pass this rule.
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ALL : PARANOID : RFC931 20 : deny
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# Allow anything from localhost. Note that an IP address (not a host
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# name) *MUST* be specified for rpcbind(8).
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ALL : localhost 127.0.0.1 : allow
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ALL : my.machine.example.com 192.0.2.35 : allow
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# To use IPv6 addresses you must enclose them in []'s
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ALL : [fe80::%fxp0]/10 : allow
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ALL : [fe80::]/10 : deny
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ALL : [3ffe:fffe:2:1:2:3:4:3fe1] : deny
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ALL : [3ffe:fffe:2:1::]/64 : allow
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# Sendmail can help protect you against spammers and relay-rapers
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sendmail : localhost : allow
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sendmail : .nice.guy.example.com : allow
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sendmail : .evil.cracker.example.com : deny
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sendmail : ALL : allow
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# Exim is an alternative to sendmail, available in the ports tree
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exim : localhost : allow
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exim : .nice.guy.example.com : allow
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exim : .evil.cracker.example.com : deny
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exim : ALL : allow
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# Rpcbind is used for all RPC services; protect your NFS!
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# (IP addresses rather than hostnames *MUST* be used here)
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rpcbind : 192.0.2.32/255.255.255.224 : allow
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rpcbind : 192.0.2.96/255.255.255.224 : allow
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rpcbind : ALL : deny
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# NIS master server. Only local nets should have access
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ypserv : localhost : allow
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ypserv : .unsafe.my.net.example.com : deny
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ypserv : .my.net.example.com : allow
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ypserv : ALL : deny
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# Provide a small amount of protection for ftpd
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ftpd : localhost : allow
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ftpd : .nice.guy.example.com : allow
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ftpd : .evil.cracker.example.com : deny
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ftpd : ALL : allow
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# You need to be clever with finger; do _not_ backfinger!! You can easily
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# start a "finger war".
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fingerd : ALL \
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: spawn (echo Finger. | \
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/usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \
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: deny
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# The rest of the daemons are protected.
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ALL : ALL \
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: severity auth.info \
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: twist /bin/echo "You are not welcome to use %d from %h."
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