.\" $OpenBSD: ypserv.acl.5,v 1.6 1997/08/05 09:26:56 maja Exp $ .\" Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se> .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by Mats O Jansson .\" 4. The name of the author may not be used to endorse or promote products .\" derived from this software without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS .\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED .\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY .\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .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. .Pp 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. .Pp 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. .Pp If access is denied every call will cause a .Nm no such domain error for the caller. .Pp Don't forget to allow localhost access if you want the machine running .Nm ypserv access it too. .Pp There is no default name for this file. Start .Nm ypserv with a .Ar -a filename to read a file with this format. .Pp The following different syntax can be used: .Pp < .Nm allow|deny > .Nm host < .Nm hostname|ip-address > .Pp If .Nm hostname has more than one ip address then all will be added to the list. .Pp < .Nm allow|deny > .Nm net < .Nm netname|netnumber > .Op Nm netmask <netname|netnumber> .Pp 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. .Pp < .Nm allow|deny > .Nm all .Pp A line containing one of these commands will always match any host. .Sh EXAMPLES .Pp A configuration file might appear as follows: .Bd -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 .Bl -tag -width /var/yp/ypserv.acl -compact .It 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>