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Operating Systems Linux resticting user to login using putty on port 21(ftp) Post 302241834 by sysgate on Tuesday 30th of September 2008 12:00:23 PM
Old 09-30-2008
There's no way to achieve that - as long as you have ftp daemon, anyone can access it via telnet.
Some FTP clients have command line as well, so your users will be able to execute commands, to some extent, and depending on the client. You should rather think of restricted access, and only to trusted persons.
 

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FTPUSERS(5)						     Linux Programmer's Manual						       FTPUSERS(5)

NAME
ftpusers - list of users that may not log in via the FTP daemon DESCRIPTION
The text file ftpusers contains a list of users that may not log in using the File Transfer Protocol (FTP) server daemon. This file is used not merely for system administration purposes but for improving security within a TCP/IP networked environment. It will typically contain a list of the users that either have no business using ftp or have too many privileges to be allowed to log in through the FTP server daemon. Such users usually include root, daemon, bin, uucp, and news. If your FTP server daemon doesn't use ftpusers then it is suggested that you read its documentation to find out how to block access for certain users. Washington University FTP server Daemon (wuftpd) and Professional FTP Daemon (proftpd) are known to make use of ftpusers. Format The format of ftpusers is very simple. There is one account name (or username) per line. Lines starting with a # are ignored. FILES
/etc/ftpusers SEE ALSO
passwd(5), proftpd(8), wuftpd(8) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2000-08-27 FTPUSERS(5)
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