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Do not allow bypassing users .profile

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Operating Systems AIX Do not allow bypassing users .profile
# 15  
Old 03-05-2015
thank you guys. your thoughts are really helpful. @agent.kgb: its a good idea to change the permissions of the users profile. users shell is already ksh. the problem is that they could call bash shell with --noprofile option through putty. their default shell is ksh. anyway "normally" they never enter command line because when they log in they run straight away the application which connects them to database and when they exit database all their connection shells are exiting.
# 16  
Old 03-05-2015
Three things I have learned by painful experience:-
  • Try to close security holes and some users will always try to find a way around it. Best to give no access except what is needed.
  • Try to make an application easy to use and someone will be unable. There are no limits to stupidity.
  • Give users the ability to do something dangerous by mistake and eventually one of them will.
    So, yes we had a function to delete old data and eventually someone ran it from the top level of the database schema.
The list goes on, but these are applicable to your concerns.



Robin
# 17  
Old 03-05-2015
SCO Is vulnerable to this also.
I have two questions.
  • How does ssh know where to find bash?
  • Does changing the permissions on bash to 0750 and changing the group to something like "admin" also solve this problem?
Last edited by rbatte1; 03-05-2015 at 12:58 PM.. Reason: Added LIST tags
# 18  
Old 03-05-2015
Quote:
Originally Posted by agent.kgb
just put them at the end and restart sshd. if your users should run only one application, use "normal" shell ksh for users, which doesn't have such options, and way better - use rksh (restricted version of ksh), set the PATH correctly in profile, make their .profile files owned by root and only readable by users.
Won't work.

The user owns the directory and can just delete or rename the root-owned .profile and then create their own.

I worked one place that tried that to prevent the use of a ".rhost" file. They created root-owned .rhost directories in everyone's home directory and IIRC set the setgid bit, making it impossible to delete.

Solution?
Code:
mv .rhost .rhost.I_CAN_NAME_ANYTHING_IN_THIS_DIRECTORY_ANYTHING_I_WANT

Then I created an .rhost file just to prove my point.

If the user owns their home directory, they own everything in it and under it.
# 19  
Old 03-06-2015
rbatte1 you are totally right! I experience the same thing a lot of times. It actually makes me angry the fact that the simpler that you are trying to make something to other people the mistakes that are done are more and more "childish". @jgt: im not 100% sure about this but i think is the same way that it find all the other shells (ksh, rksh,etc). through the environment library. if you check the location /usr/bin probably you will find all shells that you can use.
# 20  
Old 03-06-2015
I did a little experiment and set up a user with a restricted ksh shell. I found that using the "bash --noprofile" option did not allow the user to log in; the remote session hangs after accepting the password.
Sftp also failed.
For users that are only allowed sftp access, I use MySecureShell; it does not allow login attempts either.
# 21  
Old 03-06-2015
There is also an immutable file flag on some systems. Smilie
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