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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 POSIX

sftp-server

sftp-server(1M) 					  System Administration Commands					   sftp-server(1M)

NAME

       sftp-server - SFTP server subsystem

SYNOPSIS

       /usr/lib/ssh/sftp-server

DESCRIPTION

       sftp-server implements the server side of the SSH File Transfer Protocol as defined in the IETF draft-ietf-secsh-filexfer.

       sftp-server is a subsystem for sshd(1M) and must not be run directly. There are no options or config settings.

       To enable the sftp-server subsystem for sshd add the following to /etc/ssh/sshd_config:

       Subsystem   sftp     /usr/lib/ssh/sftp-server

       See sshd_config(4) for a description of the format and contents of that file.

       There is no relationship between the protocol used by sftp-server and the FTP protocol (RFC 959) provided by in.ftpd.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       >0	An error occurred.

FILES

       /usr/lib/sftp-server

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsshdu 		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sftp(1), ssh(1), ssh-add(1), ssh-keygen(1), sshd(1M), sshd_config(4), attributes(5)

       To  view  license  terms,  attribution,	and  copyright	for OpenSSH, the default path is /var/sadm/pkg/SUNWsshdr/install/copyright. If the
       Solaris operating environment has been installed anywhere other than the default, modify the given path to access the file at the installed
       location.

AUTHOR

       Markus Friedl

SunOS 5.10							    30 Jul 2003 						   sftp-server(1M)
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