156 lines
6.2 KiB
Groff
156 lines
6.2 KiB
Groff
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.\" $Xorg: xhost.man,v 1.4 2001/02/09 02:05:46 xorgcvs Exp $
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.\" $XdotOrg: app/xhost/xhost.man,v 1.2 2004/04/23 19:54:49 eich Exp $
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.\"
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.\" Copyright 1988, 1998 The Open Group
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.\" Copyright 2004 Sun Microsystems, Inc.
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, and/or sell copies of the Software, and to permit persons
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.\" to whom the Software is furnished to do so, provided that the above
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.\" copyright notice(s) and this permission notice appear in all copies of
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.\" the Software and that both the above copyright notice(s) and this
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.\" permission notice appear in supporting documentation.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
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.\" OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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.\" HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
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.\" INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
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.\" FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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.\" NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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.\" WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of a copyright holder
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.\" shall not be used in advertising or otherwise to promote the sale, use
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.\" or other dealings in this Software without prior written authorization
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.\" of the copyright holder.
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.\"
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.\" X Window System is a trademark of The Open Group.
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.\"
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.\" $XFree86: xc/programs/xhost/xhost.man,v 1.8tsi Exp $
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.\"
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.TH XHOST 1 __xorgversion__
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.SH NAME
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xhost \- server access control program for X
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.SH SYNOPSIS
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.B xhost
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[[+\-]name ...]
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.SH DESCRIPTION
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The \fIxhost\fP program
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is used to add and delete host names or user names to the list allowed
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to make connections to the X server. In the case of hosts, this provides
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a rudimentary form of privacy control and security. It is only sufficient
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for a workstation (single user) environment, although it does limit the
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worst abuses. Environments which require more sophisticated measures should
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implement the user-based mechanism or use the hooks in the
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protocol for passing other authentication data to the server.
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.SH OPTIONS
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\fIXhost\fP accepts the following command line options described below. For
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security, the options that effect access control may only be run from the
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"controlling host". For workstations, this is the same machine as the
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server. For X terminals, it is the login host.
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.TP 8
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.B \-help
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Prints a usage message.
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.TP 8
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.BI "[+]" "name"
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The given \fIname\fP (the plus sign is optional)
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is added to the list allowed to connect to the X server.
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The name can be a host name or a user name.
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.TP 8
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.BI \- "name"
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The given \fIname\fP is removed from the list of allowed
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to connect to the server. The name can be a host name or a user name.
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Existing connections are not broken, but new
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connection attempts will be denied.
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Note that the current machine is allowed to be removed; however, further
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connections (including attempts to add it back) will not be permitted.
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Resetting the server (thereby breaking all connections)
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is the only way to allow local connections again.
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.TP 8
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.B \+
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Access is granted to everyone, even if they aren't on the list
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(i.e., access control is turned off).
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.TP 8
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.B \-
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Access is restricted to only those on the list
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(i.e., access control is turned on).
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.TP 8
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.I nothing
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If no command line arguments are given,
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a message indicating whether or not access control is currently enabled
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is printed, followed by the list of those allowed to connect.
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This is the only option that may be used from machines other than
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the controlling host.
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.SH NAMES
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A complete name has the syntax
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``family:name'' where the families are
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as follows:
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.PP
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.nf
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.ta 1i
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inet Internet host (IPv4)
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inet6 Internet host (IPv6)
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dnet DECnet host
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nis Secure RPC network name
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krb Kerberos V5 principal
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local contains only one name, the empty string
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si Server Interpreted
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.fi
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.PP
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The family is case insensitive.
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The format of the name varies with the family.
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.PP
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When Secure RPC is being used, the
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network independent netname (e.g., "nis:unix.\fIuid\fP@\fIdomainname\fP") can
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be specified, or a local user can be specified with just the username
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and a trailing at-sign (e.g., "nis:pat@").
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.PP
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For backward compatibility with pre-R6 \fIxhost\fP,
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names that contain an at-sign (@) are assumed to be in the nis family.
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Otherwise they are assumed to be Internet addresses. If compiled to support
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IPv6, then all IPv4 and IPv6 addresses returned by getaddrinfo(3) are added to
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the access list in the appropriate inet or inet6 family.
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.PP
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Server interpreted addresses consist of a case-sensitive type tag and a
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string representing a given value, separated by a colon. For example,
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"si:hostname:almas" is a server interpreted address of type \fIhostname\fP,
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with a value of \fIalmas\fP.
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.SH DIAGNOSTICS
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For each name added to the access control list,
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a line of the form "\fIname\fP being added to access control list"
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is printed.
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For each name removed from the access control list,
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a line of the form "\fIname\fP being removed from access control list"
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is printed.
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.SH FILES
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/etc/X*.hosts
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.SH "SEE ALSO"
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X(__miscmansuffix__), Xsecurity(__miscmansuffix__), Xserver(1), xdm(1), xauth(1), getaddrinfo(3)
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.SH ENVIRONMENT
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.TP 8
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.B DISPLAY
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to get the default host and display to use.
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.SH BUGS
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.PP
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You can't specify a display on the command line because
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.B \-display
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is a valid command line argument (indicating that you want
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to remove the machine named
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.I ``display''
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from the access list).
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.PP
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The X server stores network addresses, not host names, unless you use
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the server-interpreted hostname type address. If somehow you change a
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host's network address while the server is still running, and you are
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using a network-address based form of authentication, \fIxhost\fP must
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be used to add the new address and/or remove the old address.
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.SH AUTHORS
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Bob Scheifler, MIT Laboratory for Computer Science,
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.br
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Jim Gettys, MIT Project Athena (DEC).
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