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YPSERV.ACL(5)               BSD File Formats Manual              YPSERV.ACL(5)

NAME
     ypserv.acl -- ypserv(8) configuration file

DESCRIPTION
     The ypserv.acl file controls which hosts can connect to the YP server.

     The format is more complex than the format for securenet(5).  The first
     two words on each line controls if the line will allow or deny access for
     a host, network (net) or all hosts.

     The YP server reads the configuration file and builds a list in memory.
     This list is processed from the beginning for every incoming request.  As
     soon as a match is found in the list the search terminates and it returns
     success or failure depending on which of allow or deny was specified.  If
     no match was found in the list success is returned.

     If access is denied every call will cause a no such domain error for the
     caller.

     Normally both the local hostname and localhost must be allowed access.
     Otherwise ypserv might not work correctly.

     There is no default name for this file.  Start ypserv with -a filename to
     read a file with this format.

     The following syntax may be used:

     < allow|deny > host < hostname|ip-address >

     If hostname has more than one IP address, they will all be added to the
     list.

     < allow|deny > net < netname|netnumber > [netmask <&lt;netname|netnumber>&gt;]

     If the netmask part of the command isn't given then the netmask will be
     assumed to be a class A, B or C net depending on the net number.

     < allow|deny > all

     A line containing one of these commands will always match any host.

FILES
     /var/yp/ypserv.acl  a ypserv(8) configuration file

EXAMPLES
     A configuration file might look like the following:

     # This is an example of an access control file to be used by ypserv.
     #
     # This file is parsed line by line. First match will terminate the check
     # of the caller.
     #

     ###########################################################################
     # This is the commands that will match a single host
     #
     #       allow host <hostname|ip-address>
     #       deny host <hostname|ip-address>
     #
     # To process hostname gethostbyname is called. If the hostname has
     # multiple ip-addresses all will be added (I hope). ip-address
     # processed by inet_aton.
     allow host localhost
     allow host myypserver
     deny host jodie

     ###########################################################################
     # This is the commands that will match a network
     #
     #       allow net <netname|netnumber> [netmask <netname|netnumber>]
     #       deny net <netname|netnumber> [netmask <netname|netnumber>]
     #
     # To process netname getnetbyname is called, and inet_aton is used for
     # netnumber. inet_aton both access numbers as 255.255.255.0 and 0xffffff00.
     #
     # If netmask isn't given the parser will assume netmask from the first bits
     # of the network number. So if the network is subneted the you have to add
     # the netmask. In my case I've got the network 139.58.253.0 at home so to
     # allow any of my computers to talk with the server I need the following
     # line
     #
     allow net mojathome netmask 255.255.255.0

     ###########################################################################
     # At last we have a command that will match any caller:
     #
     #       allow all
     #       deny all
     #

     # reject all connections
     deny all


SEE ALSO
     securenet(5), yp(8), ypserv(8)

AUTHORS
     Mats O Jansson <moj@stacken.kth.se>

BSD                              July 16, 2013                             BSD