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Annotation of elwix/config/etc/default/hosts.allow, revision 1.2

1.1       misho       1: #
                      2: # hosts.allow access control file for "tcp wrapped" applications.
1.2     ! misho       3: # $FreeBSD: src/etc/hosts.allow,v 1.24 2012/11/17 01:49:01 svnexp Exp $
1.1       misho       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."