SFTP-SERVER(8)						    BSD System Manager's Manual 					    SFTP-SERVER(8)

NAME

     sftp-server -- SFTP server subsystem

SYNOPSIS

     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

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 replaced by the user-
	     name of that user.  The default is to use the user's home directory.  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 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 blacklisted
	     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 message.

	     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 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, instead 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@openbsd.org>

BSD
								 December 11, 2014							       BSD