network_cmds-245.19.tar.gz

[apple/network_cmds.git] / ypserv.tproj / ypserv.acl.5

.\"	$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.
.\"
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.\" modification, are permitted provided that the following conditions
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.\"	This product includes software developed by Mats O Jansson
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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.
.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>