подсистема SFTP-сервера OpenSSH (OpenSSH SFTP server subsystem)
Имя (Name)
sftp-server — OpenSSH SFTP server subsystem
Синопсис (Synopsis)
sftp-server [-ehR] [-d start_directory] [-f log_facility]
[-l log_level] [-P denied_requests]
[-p allowed_requests] [-u umask]
sftp-server -Q protocol_feature
Описание (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 denied_requests
Specifies a comma-separated list of SFTP protocol requests
that are banned by the server. sftp-server will reply to
any denied request with a failure. The -Q flag can be used
to determine the supported request types. If both denied
and allowed lists are specified, then the denied list is
applied before the allowed list.
-p allowed_requests
Specifies a comma-separated list of SFTP protocol requests
that are permitted by the server. All request types that
are not on the allowed list 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
Queries protocol features supported by sftp-server. At
present the only feature that may be queried is 'requests',
which may be used to deny or allow specific requests (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.
Смотри также (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.
История (History)
sftp-server first appeared in OpenBSD 2.8.
