SFTP-SERVER - Online Linux Manual PageSection : 8
Updated : July 27 2021
NAME sftp-server —OpenSSH SFTP server subsystem
SYNOPSIS
sftp-server [-ehR] [-d start_directory] [-f log_facility] [-l log_level] [-P denied_requests] [-p allowed_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 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. -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. Using both -m and -u switches makes the umask (-u) effective only for newly created directories and explicit mode (-m) for newly created files. 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 ALSOsftp(1), ssh(1), sshd_config(5), sshd(8) Author nameT. Ylonen Author nameS. Lehtinen Article titleSSH File Transfer Protocol . %N draft-ietf-secsh-filexfer-02.txt Publication dateOctober 2001 Optional informationwork in progress material
HISTORY sftp-server first appeared in OpenBSD 2.8.
AUTHORS Markus Friedl ⟨markus@openbsd.org⟩ 0
Johanes Gumabo
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