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NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | AUTHORS | COLOPHON |
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SFTP-SERVER(8) BSD System Manager's Manual SFTP-SERVER(8)
sftp-server — SFTP server subsystem
sftp-server [-ehR] [-d start_directory] [-f log_facility]
[-l log_level] [-P blacklisted_requests]
[-p whitelisted_requests] [-u umask]
sftp-server -Q protocol_feature
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 path‐
name may contain the following tokens that are expanded at run‐
time: %% is replaced by a literal '%', %d is replaced by the
home directory of the user being authenticated, and %u is
replaced by the username of that user. The default is to use
the user's home directory. This option is useful in conjunc‐
tion with the sshd_config(5) ChrootDirectory option.
-e Causes sftp-server to print logging information to stderr
instead of syslog for debugging.
-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 debugging output. The default is ERROR.
-P blacklisted_requests
Specify a comma-separated list of SFTP protocol requests that
are banned by the server. sftp-server will reply to any black‐
listed request with a failure. The -Q flag can be used to
determine the supported request types. If both a blacklist and
a whitelist are specified, then the blacklist is applied before
the whitelist.
-p whitelisted_requests
Specify a comma-separated list of SFTP protocol requests that
are permitted by the server. All request types that are not on
the whitelist will be logged and replied to with a failure mes‐
sage.
Care must be taken when using this feature to ensure that
requests made implicitly by SFTP clients are permitted.
-Q protocol_feature
Query protocol features supported by sftp-server. At present
the only feature that may be queried is “requests”, which may
be used for black or whitelisting (flags -P and -p respec‐
tively).
-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, instead of the user's default mask.
On some systems, sftp-server must be able to access /dev/log for log‐
ging to work, and use of sftp-server in a chroot configuration there‐
fore requires that syslogd(8) establish a logging socket inside the
chroot directory.
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.
sftp-server first appeared in OpenBSD 2.8.
Markus Friedl <markus@openbsd.org>
This page is part of the openssh (Portable OpenSSH) project. Informa‐
tion about the project can be found at
http://www.openssh.com/portable.html. If you have a bug report for
this manual page, see ⟨http://www.openssh.com/report.html⟩. This page
was obtained from the tarball openssh-7.6p1.tar.gz fetched from
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2018-02-02. If you discover any rendering problems in this HTML ver‐
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information in this COLOPHON (which is not part of the original manual
page), send a mail to man-pages@man7.org
BSD December 11, 2014 BSD
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