06-15-2011
Can use the configuration items: DenyUsers SSHD, AllowUsers, DenyGroups, AllowGroups
For example:
You hope to ban the use of users use SFTP service to join a group like xyz
And then in/etc/SSH/sshd_config Settings
DenyGroups xyz
So, all belong to the xyz users will not logged in SSH permissions, nature also did not use the SFTP permissions.
Note in sshd_config banned SFTP off just-is not enough, because the server as long as users also can pass
SSH login can use other user of essential tools such as SCP uploads and downloads files, the effect is the same with SFTP actually.
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LEARN ABOUT DEBIAN
sftp-server
SFTP-SERVER(8) BSD System Manager's Manual SFTP-SERVER(8)
NAME
sftp-server -- SFTP server subsystem
SYNOPSIS
sftp-server [-ehR] [-f log_facility] [-l log_level] [-u umask]
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:
-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.
-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.
For logging to work, sftp-server must be able to access /dev/log. 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-00.txt, January 2001, work in progress material.
HISTORY
sftp-server first appeared in OpenBSD 2.8.
AUTHORS
Markus Friedl <markus@openbsd.org>
BSD
January 9, 2010 BSD