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Full Discussion: SFTP user include/exclude without preventing SSH login
Operating Systems Linux Red Hat SFTP user include/exclude without preventing SSH login Post 302783901 by rbatte1 on Thursday 21st of March 2013 07:03:57 AM
Old 03-21-2013
SFTP user include/exclude without preventing SSH login
I have been asked to see if we can restrict SFTP access to authorised users only. There will be business users who will log on with SSH, but they are locked into a menu. They will have write access to the production data to do their job, but we don't want them to have access to read/write the files with SFTP or anything else for that matter.

For plain FTP, we would use the /etc/ftpusers file and re-create it each night with all users in /etc/passwd except those in the allowed list. Not clever, but it worked.


We're running RHEL / Centos 6.3 and the server is running vsftp is installed for plain FTP along with openssh-server-5.3p1-81.el6_3.x86_64 The sshd_config file defines sftp as starting up /usr/libexec/openssh/sftp-server


Any suggestions? Badly, the users home directory is a common area with the application & data below it, so I can't just enforce the chroot jail. User SSH login is by userid/password rather than certificate. Not sure if that helps or hinders.


Thanks, in advance,
Robin
 

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LEARN ABOUT CENTOS

sftp-server

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] [-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:

     -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 '%', %h is replaced by the home directory of the user being authenticated, and %u is replaced by the user-
	     name 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.

     -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-02.txt, October 2001, work in progress material.

HISTORY

     sftp-server first appeared in OpenBSD 2.8.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								   July 16, 2013							       BSD
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