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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] [-m force_file_perms]
     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 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 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 pos-
             sible 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.
     -m force_file_perms
             Sets explicit file permissions to be applied to newly-created
             files instead of the default or client requested mode.  Numeric
             values include: 777, 755, 750, 666, 644, 640, etc.  Option -u is
             ineffective if -m is set.
     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                             April 19, 2024                             BSD