Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se>
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.Dd July 2, 1994 .Dt YPSERV.ACL 5 .Os .Sh NAME .Nm ypserv.acl .Nd .Xr ypserv 8 configuration file .Sh DESCRIPTION The .Nm ypserv.acl file controls which hosts can connect to the .Nm YP server.
p The format is more complex than the format for .Xr securenet 5 . The first two verbs on each line controls if the line will .Nm allow or .Nm deny access for a .Nm host , network .Nm (net) or .Nm all hosts.
p The .Nm YP server reads the configuration file and build a list in memory. This list is processed from the beginning for every incomming request. As soon a match is found in the list the search terminates and it returns success or failure depending on .Nm allow or .Nm deny . If no match was found in the list success is returned.
p If access is denied every call will cause a .Nm no such domain error for the caller.
p Don't forget to allow localhost access if you want the machine running .Nm ypserv access it too.
p There is no default name for this file. Start .Nm ypserv with a .Ar -a filename to read a file with this format.
p The following different syntax can be used:
p < .Nm allow|deny > .Nm host < .Nm hostname|ip-address >
p If .Nm hostname has more than one ip address then all will be added to the list.
p < .Nm allow|deny > .Nm net < .Nm netname|netnumber > .Op Nm netmask <netname|netnumber>
p If .Nm 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.
p < .Nm allow|deny > .Nm all
p A line containing one of these commands will always match any host. .Sh EXAMPLES
p A configuration file might appear as follows: d -literal # 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 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 too # 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 .Ed .Sh FILES l -tag -width /var/yp/ypserv.acl -compact t Pa /var/yp/ypserv.acl A .Xr ypserv 8 configuration file. .El .Sh SEE ALSO .Xr yp 8 , .Xr ypserv 8 , .Xr securenet 5 .Sh AUTHOR Mats O Jansson <moj@stacken.kth.se>