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+SFTP-SERVER(8)              System Manager's Manual             SFTP-SERVER(8)
+
+NAME
+     sftp-server M-bM-^@M-^S OpenSSH 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 username 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 M-bM-^@M-^\requestsM-bM-^@M-^], 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>
+
+OpenBSD 6.6                    November 30, 2019                   OpenBSD 6.6