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spawn a process with a different user

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# 1  
Old 11-09-2010
spawn a process with a different user
Hello Everyone:

I have the following code

Code:
int main()
{
   system("/usr/OtherUser/bin/runX");
  return 0;
}

runX must be executed with privileges from another user, how could I do that? I know the password for such user.

Thanks in advance
# 2  
Old 11-09-2010
There is su, but I am not sure if su reads sdin for password (ssh2 reads /dev/tty, so you need a tty generating wrapper like expect):
Code:
 
system( "su - user -c /usr/OtherUser/bin/runX");

You can use rsh/ssh/ssh2 trusted access:
Code:
system( "ssh2 -n user@localhost /usr/OtherUser/bin/runX");

# 3  
Old 11-09-2010
Hello DGPickett, Thanks for quick response

su does read from stdin, unfortunately seems stdin is flushed before su prompts for the password, so I must wait for two seconds before entering the password but I don't know how.

Thanks again
# 4  
Old 11-09-2010
Quote:
Originally Posted by DGPickett
There is su, but I am not sure if su reads stdin for password
For obvious security reasons, it doesn't, just like any other sane command that takes a password.
This User Gave Thanks to Corona688 For This Post:
edgarvm
# 5  
Old 11-09-2010
Let's assume you not trying to hack a privileged account...
can you make /usr/OtherUser/bin/runX setuid.

And give yourself group execute?
This User Gave Thanks to purdym For This Post:
edgarvm
# 6  
Old 11-09-2010
Two ideas that comes to my mind:
  • why should the runX be run with the priviledges of OtherUser. If the reason is because of files permissions, a better solution could involve putting User and OtherUser in the same group
  • If you still need to runX as OtherUser, I would recommend to use sudo (instead of su). You can configure sudo to run the program as OtherUser from User without password query
HTH,
Loïc
This User Gave Thanks to Loic Domaigne For This Post:
edgarvm
# 7  
Old 11-09-2010
The ssh seems like overkill but is more secure. Two seconds, oh whoop!
Code:
 
system( "(sleep 3;echo the_password)|su - -c /usr/OtherUser/bin/runX" );
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