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97 lines
4.2 KiB
Plaintext
97 lines
4.2 KiB
Plaintext
SFTP-SERVER(8) System Manager's Manual SFTP-SERVER(8)
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NAME
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sftp-server M-bM-^@M-^S SFTP server subsystem
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SYNOPSIS
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sftp-server [-ehR] [-d start_directory] [-f log_facility] [-l log_level]
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[-P blacklisted_requests] [-p whitelisted_requests]
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[-u umask]
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sftp-server -Q protocol_feature
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DESCRIPTION
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sftp-server is a program that speaks the server side of SFTP protocol to
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stdout and expects client requests from stdin. sftp-server is not
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intended to be called directly, but from sshd(8) using the Subsystem
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option.
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Command-line flags to sftp-server should be specified in the Subsystem
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declaration. See sshd_config(5) for more information.
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Valid options are:
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-d start_directory
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specifies an alternate starting directory for users. The
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pathname may contain the following tokens that are expanded at
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runtime: %% is replaced by a literal '%', %d is replaced by the
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home directory of the user being authenticated, and %u is
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replaced by the username of that user. The default is to use the
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user's home directory. This option is useful in conjunction with
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the sshd_config(5) ChrootDirectory option.
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-e Causes sftp-server to print logging information to stderr instead
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of syslog for debugging.
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-f log_facility
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Specifies the facility code that is used when logging messages
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from sftp-server. The possible values are: DAEMON, USER, AUTH,
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LOCAL0, LOCAL1, LOCAL2, LOCAL3, LOCAL4, LOCAL5, LOCAL6, LOCAL7.
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The default is AUTH.
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-h Displays sftp-server usage information.
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-l log_level
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Specifies which messages will be logged by sftp-server. The
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possible values are: QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG,
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DEBUG1, DEBUG2, and DEBUG3. INFO and VERBOSE log transactions
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that sftp-server performs on behalf of the client. DEBUG and
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DEBUG1 are equivalent. DEBUG2 and DEBUG3 each specify higher
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levels of debugging output. The default is ERROR.
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-P blacklisted_requests
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Specify a comma-separated list of SFTP protocol requests that are
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banned by the server. sftp-server will reply to any blacklisted
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request with a failure. The -Q flag can be used to determine the
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supported request types. If both a blacklist and a whitelist are
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specified, then the blacklist is applied before the whitelist.
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-p whitelisted_requests
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Specify a comma-separated list of SFTP protocol requests that are
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permitted by the server. All request types that are not on the
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whitelist will be logged and replied to with a failure message.
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Care must be taken when using this feature to ensure that
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requests made implicitly by SFTP clients are permitted.
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-Q protocol_feature
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Query protocol features supported by sftp-server. At present the
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only feature that may be queried is M-bM-^@M-^\requestsM-bM-^@M-^], which may be used
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for black or whitelisting (flags -P and -p respectively).
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-R Places this instance of sftp-server into a read-only mode.
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Attempts to open files for writing, as well as other operations
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that change the state of the filesystem, will be denied.
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-u umask
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Sets an explicit umask(2) to be applied to newly-created files
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and directories, instead of the user's default mask.
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On some systems, sftp-server must be able to access /dev/log for logging
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to work, and use of sftp-server in a chroot configuration therefore
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requires that syslogd(8) establish a logging socket inside the chroot
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directory.
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SEE ALSO
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sftp(1), ssh(1), sshd_config(5), sshd(8)
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T. Ylonen and S. Lehtinen, SSH File Transfer Protocol, draft-ietf-secsh-
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filexfer-02.txt, October 2001, work in progress material.
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HISTORY
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sftp-server first appeared in OpenBSD 2.8.
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AUTHORS
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Markus Friedl <markus@openbsd.org>
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OpenBSD 5.8 December 11, 2014 OpenBSD 5.8
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