cd command in an ftp session

Lino Martinez — Fri, 11 Apr 2003 00:47:26 GMT

Hi everybody
How can I restrict the cd command in an ftp session?

I want that a user can't navigate the tree in the ftp session.

thanks in advance!

Re: cd command in an ftp session

Michael Steele_2 — Fri, 11 Apr 2003 01:32:00 GMT

Change the user's shell to restricted. I.e., rksh or rsh.

See a list of all shells in /etc/shells.

Re: cd command in an ftp session

Yogeeraj_1 — Fri, 11 Apr 2003 02:53:22 GMT

hello,

have a look at my post at:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xc736b941255cd71190080090279cd0f9,00.html

tons of information there!

in summary:
1. Configure the ftpaccess file:

a. cd /etc/ftpd

b. cp -p /usr/newconfig/etc/ftpd/ftpaccess .

c. vi ftpaccess. At the bottom of the file there is a guestgroup
directive 'guestgroup ftponly'.

i. Either change that group designation to one you already
have or keep that designation.

ii. If you are keeping the ftponly group, then create that
group on your system.

2. Modify the /etc/inetd.conf file to enable the use of the ftpaccess
file:

a. vi /etc/inetd.conf

b. Add the -a flag to the ftp daemon.

c. ftp stream tcp nowait root /usr/lbin/ftpd ftpd -a -l

4. Make inetd re-read its configuration:

inetd -c

5. Create an /etc/shells file:

a. vi /etc/shells

b. Include these lines in the file:

/sbin/sh
/usr/bin/ksh
/usr/bin/sh
/usr/bin/csh
/usr/bin/rsh
/usr/bin/rksh
/usr/bin/keysh
/bin/sh
/bin/ksh
/bin/csh
/bin/rsh
/bin/rksh
/usr/bin/false

6. Now add a user to the system. Use a group that is 'ftponly' and
make the user's shell /usr/bin/false.

7. Use SAM to limit the user to his home directory by setting up the
directory in this form:

/home/username/./

Note: The /./ is the important key here. When the ftpd verifies a
user's login, it checks and sees that the user is a member of
the 'guestgroup' ftponly. It then examines the home directory
and, if it sees a /./ in the path, it will then perform a chroot
to that directory. Therefore, when that user FTPs into the
system, their home directory will appear as the / directory.

8. Provide the user with an ls command:

a. cd /home/username

b. mkdir usr

c. mkdir usr/bin

d. cp -p /sbin/ls usr/bin

e. chown -R bin:bin usr

f. chmod -R 555 usr

hth
Yogeeraj

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