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Annotation of elwix/config/etc/default/hosts.allow, revision 1.1

1.1     ! misho       1: #
        !             2: # hosts.allow access control file for "tcp wrapped" applications.
        !             3: # $FreeBSD: src/etc/hosts.allow,v 1.23 2006/08/29 09:20:48 ru Exp $
        !             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.
        !            23: ALL : 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: # Protect against simple DNS spoofing attacks by checking that the
        !            30: # forward and reverse records for the remote host match. If a mismatch
        !            31: # occurs, access is denied, and any positive ident response within
        !            32: # 20 seconds is logged. No protection is afforded against DNS poisoning,
        !            33: # IP spoofing or more complicated attacks. Hosts with no reverse DNS
        !            34: # pass this rule.
        !            35: ALL : PARANOID : RFC931 20 : deny
        !            36: 
        !            37: # Allow anything from localhost.  Note that an IP address (not a host
        !            38: # name) *MUST* be specified for rpcbind(8).
        !            39: ALL : localhost 127.0.0.1 : allow
        !            40: # Comment out next line if you build libwrap without IPv6 support.
        !            41: ALL : [::1] : allow
        !            42: #ALL : my.machine.example.com 192.0.2.35 : allow
        !            43: 
        !            44: # To use IPv6 addresses you must enclose them in []'s
        !            45: #ALL : [fe80::%fxp0]/10 : allow
        !            46: #ALL : [fe80::]/10 : deny
        !            47: #ALL : [2001:db8:2:1:2:3:4:3fe1] : deny
        !            48: #ALL : [2001:db8:2:1::]/64 : allow
        !            49: 
        !            50: # Sendmail can help protect you against spammers and relay-rapers
        !            51: sendmail : localhost : allow
        !            52: #sendmail : .nice.guy.example.com : allow
        !            53: #sendmail : .evil.cracker.example.com : deny
        !            54: sendmail : ALL : allow
        !            55: 
        !            56: # Exim is an alternative to sendmail, available in the ports tree
        !            57: exim : localhost : allow
        !            58: #exim : .nice.guy.example.com : allow
        !            59: #exim : .evil.cracker.example.com : deny
        !            60: exim : ALL : allow
        !            61: 
        !            62: # Rpcbind is used for all RPC services; protect your NFS!
        !            63: # (IP addresses rather than hostnames *MUST* be used here)
        !            64: #rpcbind : 192.0.2.32/255.255.255.224 : allow
        !            65: #rpcbind : 192.0.2.96/255.255.255.224 : allow
        !            66: rpcbind : ALL : deny
        !            67: 
        !            68: # NIS master server. Only local nets should have access
        !            69: # (Since this is an RPC service, rpcbind needs to be considered)
        !            70: ypserv : localhost : allow
        !            71: #ypserv : .unsafe.my.net.example.com : deny
        !            72: #ypserv : .my.net.example.com : allow
        !            73: ypserv : ALL : deny
        !            74: 
        !            75: # Provide a small amount of protection for ftpd
        !            76: ftpd : localhost : allow
        !            77: #ftpd : .nice.guy.example.com : allow
        !            78: #ftpd : .evil.cracker.example.com : deny
        !            79: ftpd : ALL : allow
        !            80: 
        !            81: # You need to be clever with finger; do _not_ backfinger!! You can easily
        !            82: # start a "finger war".
        !            83: fingerd : ALL \
        !            84:        : spawn (echo Finger. | \
        !            85:         /usr/bin/mail -s "tcpd\: %u@%h[%a] fingered me!" root) & \
        !            86:        : deny
        !            87: 
        !            88: # The rest of the daemons are protected.
        !            89: ALL : ALL \
        !            90:        : severity auth.info \
        !            91:        : twist /bin/echo "You are not welcome to use %d from %h."