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SFTP-SERVER(8) BSD System Manager's Manual SFTP-SERVER(8)
NAME
sftp-server -- OpenSSH SFTP server subsystem
SYNOPSIS
sftp-server [-ehR] [-d start_directory] [-f log_facility] [-l log_level]
[-P denied_requests] [-p allowed_requests] [-u umask]
sftp-server -Q protocol_feature
DESCRIPTION
sftp-server is a program that speaks the server side of SFTP protocol to stdout and expects
client requests from stdin. sftp-server is not intended to be called directly, but from
sshd(8) using the Subsystem option.
Command-line flags to sftp-server should be specified in the Subsystem declaration. See
sshd_config(5) for more information.
Valid options are:
-d start_directory
Specifies an alternate starting directory for users. The pathname may contain the
following tokens that are expanded at runtime: %% is replaced by a literal '%', %d
is replaced by the home directory of the user being authenticated, and %u is re-
placed by the username of that user. The default is to use the user's home direc-
tory. This option is useful in conjunction with the sshd_config(5) ChrootDirectory
option.
-e Causes sftp-server to print logging information to stderr instead of syslog for de-
bugging.
-f log_facility
Specifies the facility code that is used when logging messages from sftp-server.
The possible values are: DAEMON, USER, AUTH, LOCAL0, LOCAL1, LOCAL2, LOCAL3, LOCAL4,
LOCAL5, LOCAL6, LOCAL7. The default is AUTH.
-h Displays sftp-server usage information.
-l log_level
Specifies which messages will be logged by sftp-server. The possible values are:
QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1, DEBUG2, and DEBUG3. INFO and
VERBOSE log transactions that sftp-server performs on behalf of the client. DEBUG
and DEBUG1 are equivalent. DEBUG2 and DEBUG3 each specify higher levels of debug-
ging output. The default is ERROR.
-P denied_requests
Specifies a comma-separated list of SFTP protocol requests that are banned by the
server. sftp-server will reply to any denied request with a failure. The -Q flag
can be used to determine the supported request types. If both denied and allowed
lists are specified, then the denied list is applied before the allowed list.
-p allowed_requests
Specifies a comma-separated list of SFTP protocol requests that are permitted by the
server. All request types that are not on the allowed list will be logged and
replied to with a failure message.
Care must be taken when using this feature to ensure that requests made implicitly
by SFTP clients are permitted.
-Q protocol_feature
Queries protocol features supported by sftp-server. At present the only feature
that may be queried is "requests", which may be used to deny or allow specific re-
quests (flags -P and -p respectively).
-R Places this instance of sftp-server into a read-only mode. Attempts to open files
for writing, as well as other operations that change the state of the filesystem,
will be denied.
-u umask
Sets an explicit umask(2) to be applied to newly-created files and directories, in-
stead of the user's default mask.
On some systems, sftp-server must be able to access /dev/log for logging to work, and use of
sftp-server in a chroot configuration therefore requires that syslogd(8) establish a logging
socket inside the chroot directory.
SEE ALSO
sftp(1), ssh(1), sshd_config(5), sshd(8)
T. Ylonen and S. Lehtinen, SSH File Transfer Protocol, draft-ietf-secsh-filexfer-02.txt,
October 2001, work in progress material.
HISTORY
sftp-server first appeared in OpenBSD 2.8.
AUTHORS
Markus Friedl <markus AT openbsd.org>
BSD July 27, 2021 BSD
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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