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authorKaleb Keithley <kaleb@freedesktop.org>2003-11-14 15:54:53 +0000
committerKaleb Keithley <kaleb@freedesktop.org>2003-11-14 15:54:53 +0000
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+.\" $Xorg: xhost.man,v 1.4 2001/02/09 02:05:46 xorgcvs Exp $
+.\" Copyright 1988, 1998 The Open Group
+.\"
+.\" Permission to use, copy, modify, distribute, and sell this software and its
+.\" documentation for any purpose is hereby granted without fee, provided that
+.\" the above copyright notice appear in all copies and that both that
+.\" copyright notice and this permission notice appear in supporting
+.\" documentation.
+.\"
+.\" The above copyright notice and this permission notice shall be included
+.\" in all copies or substantial portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+.\" IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+.\" OTHER DEALINGS IN THE SOFTWARE.
+.\"
+.\" Except as contained in this notice, the name of The Open Group shall
+.\" not be used in advertising or otherwise to promote the sale, use or
+.\" other dealings in this Software without prior written authorization
+.\" from The Open Group.
+.TH XHOST 1 "Release 6.4" "X Version 11"
+.SH NAME
+xhost \- server access control program for X
+.SH SYNOPSIS
+.B xhost
+[[+\-]name ...]
+.SH DESCRIPTION
+The \fIxhost\fP program
+is used to add and delete host names or user names to the list allowed
+to make connections to the X server. In the case of hosts, this provides
+a rudimentary form of privacy control and security. It is only sufficient
+for a workstation (single user) environment, although it does limit the
+worst abuses. Environments which require more sophisticated measures should
+implement the user-based mechanism or use the hooks in the
+protocol for passing other authentication data to the server.
+.SH OPTIONS
+\fIXhost\fP accepts the following command line options described below. For
+security, the options that effect access control may only be run from the
+"controlling host". For workstations, this is the same machine as the
+server. For X terminals, it is the login host.
+.TP 8
+.B \-help
+Prints a usage message.
+.TP 8
+.BI "[+]" "name"
+The given \fIname\fP (the plus sign is optional)
+is added to the list allowed to connect to the X server.
+The name can be a host name or a user name.
+.TP 8
+.BI \- "name"
+The given \fIname\fP is removed from the list of allowed
+to connect to the server. The name can be a host name or a user name.
+Existing connections are not broken, but new
+connection attempts will be denied.
+Note that the current machine is allowed to be removed; however, further
+connections (including attempts to add it back) will not be permitted.
+Resetting the server (thereby breaking all connections)
+is the only way to allow local connections again.
+.TP 8
+.B \+
+Access is granted to everyone, even if they aren't on the list
+(i.e., access control is turned off).
+.TP 8
+.B \-
+Access is restricted to only those on the list
+(i.e., access control is turned on).
+.TP 8
+.I nothing
+If no command line arguments are given,
+a message indicating whether or not access control is currently enabled
+is printed, followed by the list of those allowed to connect.
+This is the only option that may be used from machines other than
+the controlling host.
+.SH NAMES
+A complete name has the syntax
+``family:name'' where the families are
+as follows:
+.PP
+.nf
+.ta 1i
+inet Internet host
+dnet DECnet host
+nis Secure RPC network name
+krb Kerberos V5 principal
+local contains only one name, the empty string
+.fi
+.PP
+The family is case insensitive.
+The format of the name varies with the family.
+.PP
+When Secure RPC is being used, the
+network independent netname (e.g., "nis:unix.\fIuid\fP@\fIdomainname\fP") can
+be specified, or a local user can be specified with just the username
+and a trailing at-sign (e.g., "nis:pat@").
+.PP
+For backward compatibility with pre-R6 \fIxhost\fP,
+names that contain an at-sign (@) are assumed to be in the nis family.
+Otherwise the inet family is assumed.
+.SH DIAGNOSTICS
+For each name added to the access control list,
+a line of the form "\fIname\fP being added to access control list"
+is printed.
+For each name removed from the access control list,
+a line of the form "\fIname\fP being removed from access control list"
+is printed.
+.SH FILES
+/etc/X*.hosts
+.SH "SEE ALSO"
+X(1), Xsecurity(1), Xserver(1), xdm(1)
+.SH ENVIRONMENT
+.TP 8
+.B DISPLAY
+to get the default host and display to use.
+.SH BUGS
+.PP
+You can't specify a display on the command line because
+.B \-display
+is a valid command line argument (indicating that you want
+to remove the machine named
+.I ``display''
+from the access list).
+.PP
+The X server stores network addresses, not host names. This is not
+really a bug. If somehow you change a host's network address while
+the server is still running, \fIxhost\fP must be used to add the new
+address and/or remove the old address.
+.SH AUTHORS
+Bob Scheifler, MIT Laboratory for Computer Science,
+.br
+Jim Gettys, MIT Project Athena (DEC).