171 lines
5.0 KiB
Groff
171 lines
5.0 KiB
Groff
.\" $OpenBSD: sftp-server.8,v 1.30 2020/06/22 06:36:40 jmc Exp $
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.\"
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.\" Copyright (c) 2000 Markus Friedl. 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd $Mdocdate: June 22 2020 $
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.Dt SFTP-SERVER 8
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.Os
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.Sh NAME
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.Nm sftp-server
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.Nd OpenSSH SFTP server subsystem
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.Sh SYNOPSIS
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.Nm sftp-server
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.Bk -words
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.Op Fl ehR
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.Op Fl d Ar start_directory
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.Op Fl f Ar log_facility
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.Op Fl l Ar log_level
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.Op Fl P Ar denied_requests
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.Op Fl p Ar allowed_requests
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.Op Fl u Ar umask
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.Ek
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.Nm
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.Fl Q Ar protocol_feature
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.Sh DESCRIPTION
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.Nm
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is a program that speaks the server side of SFTP protocol
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to stdout and expects client requests from stdin.
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.Nm
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is not intended to be called directly, but from
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.Xr sshd 8
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using the
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.Cm Subsystem
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option.
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.Pp
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Command-line flags to
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.Nm
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should be specified in the
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.Cm Subsystem
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declaration.
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See
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.Xr sshd_config 5
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for more information.
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.Pp
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Valid options are:
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.Bl -tag -width Ds
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.It Fl d Ar start_directory
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specifies an alternate starting directory for users.
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The pathname may contain the following tokens that are expanded at runtime:
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%% is replaced by a literal '%',
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%d is replaced by the home directory of the user being authenticated,
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and %u is replaced by the username of that user.
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The default is to use the user's home directory.
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This option is useful in conjunction with the
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.Xr sshd_config 5
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.Cm ChrootDirectory
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option.
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.It Fl e
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Causes
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.Nm
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to print logging information to stderr instead of syslog for debugging.
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.It Fl f Ar log_facility
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Specifies the facility code that is used when logging messages from
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.Nm .
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The possible values are: DAEMON, USER, AUTH, LOCAL0, LOCAL1, LOCAL2,
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LOCAL3, LOCAL4, LOCAL5, LOCAL6, LOCAL7.
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The default is AUTH.
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.It Fl h
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Displays
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.Nm
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usage information.
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.It Fl l Ar log_level
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Specifies which messages will be logged by
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.Nm .
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The possible values are:
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QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1, DEBUG2, and DEBUG3.
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INFO and VERBOSE log transactions that
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.Nm
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performs on behalf of the client.
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DEBUG and DEBUG1 are equivalent.
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DEBUG2 and DEBUG3 each specify higher levels of debugging output.
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The default is ERROR.
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.It Fl P Ar denied_requests
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Specify a comma-separated list of SFTP protocol requests that are banned by
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the server.
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.Nm
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will reply to any denied request with a failure.
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The
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.Fl Q
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flag can be used to determine the supported request types.
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If both denied and allowed lists are specified, then the denied list is
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applied before the allowed list.
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.It Fl p Ar allowed_requests
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Specify a comma-separated list of SFTP protocol requests that are permitted
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by the server.
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All request types that are not on the allowed list will be logged and replied
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to with a failure message.
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.Pp
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Care must be taken when using this feature to ensure that requests made
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implicitly by SFTP clients are permitted.
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.It Fl Q Ar protocol_feature
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Query protocol features supported by
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.Nm .
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At present the only feature that may be queried is
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.Dq requests ,
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which may be used to deny or allow specific requests (flags
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.Fl P
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and
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.Fl p
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respectively).
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.It Fl R
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Places this instance of
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.Nm
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into a read-only mode.
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Attempts to open files for writing, as well as other operations that change
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the state of the filesystem, will be denied.
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.It Fl u Ar umask
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Sets an explicit
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.Xr umask 2
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to be applied to newly-created files and directories, instead of the
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user's default mask.
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.El
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.Pp
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On some systems,
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.Nm
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must be able to access
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.Pa /dev/log
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for logging to work, and use of
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.Nm
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in a chroot configuration therefore requires that
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.Xr syslogd 8
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establish a logging socket inside the chroot directory.
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.Sh SEE ALSO
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.Xr sftp 1 ,
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.Xr ssh 1 ,
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.Xr sshd_config 5 ,
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.Xr sshd 8
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.Rs
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.%A T. Ylonen
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.%A S. Lehtinen
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.%T "SSH File Transfer Protocol"
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.%N draft-ietf-secsh-filexfer-02.txt
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.%D October 2001
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.%O work in progress material
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.Re
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.Sh HISTORY
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.Nm
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first appeared in
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.Ox 2.8 .
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.Sh AUTHORS
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.An Markus Friedl Aq Mt markus@openbsd.org
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