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Full Discussion: Log Out SSH User in Bash
Top Forums Shell Programming and Scripting Log Out SSH User in Bash Post 302814793 by FreddoT on Thursday 30th of May 2013 08:19:58 AM
Old 05-30-2013
Wrench Log Out SSH User in Bash
So, I've been writing a system to allow users temporary access onto a system.

Essentially, there's a web server with a PHP script, the PHP script takes a Username & Password from a webform, and passes it to a script, createusr.sh.

The script looks something like this:

Code:
pass=$(perl -e 'print crypt($ARGV[0], "password")' $2)
sudo /usr/sbin/useradd $1 -s /bin/bash -p $pass -d /home/onlineusers/$1 -m
sudo /bin/chmod 700 /home/onlineusers/$1
sleep 1800
sudo /usr/sbin/userdel -f $1
sudo /bin/rm -rf /home/onlineusers/$1

Basically it creates a user, using the passed parameters, and force creates their home directory. It then makes that directory only accessible to said user, before sleeping for half an hour.

After that time it deletes the user and their home directory. But I have one problem. If the user is still logged on at that point, then the user deletion has no effect, as the user can still work.

At the moment, I am thinking of using:

Code:
pgrep -t <user's tty>

and then killing the bash, but I'm not sure how I can get the TTY of a user logged in through SSH?

Maybe somehow "grep" with "w" might do it, but not if the username contains something like "load" which is featured elsewhere in the output from "w".

Besides this, is there any way that I can send a message to a logged in user, saying something like "5 minutes left"?

Code:
write

seems like a possibility, but I'm not sure exactly how this would be implemented.
Last edited by FreddoT; 05-30-2013 at 09:27 AM..
 

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LEARN ABOUT CENTOS

sss_userdel

SSS_USERDEL(8)							 SSSD Manual pages						    SSS_USERDEL(8)

NAME

       sss_userdel - delete a user account

SYNOPSIS

       sss_userdel [options] LOGIN

DESCRIPTION

       sss_userdel deletes a user identified by login name LOGIN from the system.

OPTIONS

       -?,--help
	   Display help message and exit.

       -r,--remove
	   Files in the user's home directory will be removed along with the home directory itself and the user's mail spool. Overrides the
	   configuration.

       -R,--no-remove
	   Files in the user's home directory will NOT be removed along with the home directory itself and the user's mail spool. Overrides the
	   configuration.

       -f,--force
	   This option forces sss_userdel to remove the user's home directory and mail spool, even if they are not owned by the specified user.

       -k,--kick
	   Before actually deleting the user, terminate all his processes.

THE LOCAL DOMAIN

       In order to function correctly, a domain with "id_provider=local" must be created and the SSSD must be running.

       The administrator might want to use the SSSD local users instead of traditional UNIX users in cases where the group nesting (see
       sss_groupadd(8)) is needed. The local users are also useful for testing and development of the SSSD without having to deploy a full remote
       server. The sss_user* and sss_group* tools use a local LDB storage to store users and groups.

SEE ALSO

       sssd(8), sssd.conf(5), sssd-ldap(5), sssd-krb5(5), sssd-simple(5), sssd-ipa(5), sssd-ad(5), sssd-sudo(5),sss_cache(8), sss_debuglevel(8),
       sss_groupadd(8), sss_groupdel(8), sss_groupshow(8), sss_groupmod(8), sss_useradd(8), sss_userdel(8), sss_usermod(8), sss_obfuscate(8),
       sss_seed(8), sssd_krb5_locator_plugin(8), sss_ssh_authorizedkeys(8), sss_ssh_knownhostsproxy(8),pam_sss(8).

AUTHORS

       The SSSD upstream - http://fedorahosted.org/sssd

SSSD
								    06/17/2014							    SSS_USERDEL(8)
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