8ea3178507
Reviewed by: Garrett Wollman <wollman@freebsd.org> Submitted by: Warner Losh <imp@village.org> Close PR bin/1145: Add -s flag to tftpd. This enables the so-called secure mode of tftpd where it chroots to a given directory before allowing access to the files. In addition, it runs as nobody when in this mode. Reviewed a long time ago by Bill and Garrett. Apply my patch from the pr, and close the PR.
122 lines
4.0 KiB
Groff
122 lines
4.0 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)tftpd.8 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt TFTPD 8
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.Os BSD 4.2
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.Sh NAME
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.Nm tftpd
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.Nd
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Internet Trivial File Transfer Protocol server
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.Sh SYNOPSIS
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.Nm tftpd
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.Op Fl l
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.Op Fl n
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.Op Fl s Ar directory
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.Op Ar directory ...
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.Sh DESCRIPTION
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.Nm Tftpd
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is a server which supports the
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Internet Trivial File Transfer
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Protocol (\c
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.Tn RFC 783).
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The
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.Tn TFTP
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server operates
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at the port indicated in the
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.Ql tftp
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service description;
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see
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.Xr services 5 .
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The server is normally started by
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.Xr inetd 8 .
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.Pp
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The use of
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.Xr tftp 1
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does not require an account or password on the remote system.
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Due to the lack of authentication information,
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.Nm tftpd
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will allow only publicly readable files to be
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accessed.
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Files containing the string ``/\|\fB.\|.\fP\|/'' are not allowed.
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Files may be written only if they already exist and are publicly writable.
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Note that this extends the concept of
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.Dq public
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to include
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all users on all hosts that can be reached through the network;
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this may not be appropriate on all systems, and its implications
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should be considered before enabling tftp service.
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The server should have the user ID with the lowest possible privilege.
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.Pp
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Access to files may be restricted by invoking
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.Nm tftpd
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with a list of directories by including up to 20 pathnames
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as server program arguments in
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.Pa /etc/inetd.conf .
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In this case access is restricted to files whose
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names are prefixed by the one of the given directories.
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The given directories are also treated as a search path for
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relative filename requests.
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.Pp
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The chroot option provides additional security by restricting access
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of tftpd to only a chroot'd file system. This is useful when moving
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from an OS that supported
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.Nm -s
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as a boot server. Because chroot is restricted to root, you must run
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tftpd as root. However, if you chroot, then
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.Nm tftpd
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will set its user id to nobody.
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.Pp
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The options are:
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.Bl -tag -width Ds
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.It Fl l
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Logs all requests using
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.Xr syslog 3 .
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.It Fl n
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Suppresses negative acknowledgement of requests for nonexistent
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relative filenames.
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.It Fl s Ar directory
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Causes tftpd to chroot to
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.Pa directory
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before accepting commands. In addition, the user id is set to
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nobody.
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.El
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.Sh SEE ALSO
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.Xr tftp 1 ,
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.Xr inetd 8
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.2 .
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