C program to kill root processes Post: 38356

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Top Forums Programming C program to kill root processes Post 38356 by TioTony on Monday 14th of July 2003 07:26:50 PM

07-14-2003

Registered User

C program to kill root processes

Hello,
First let me start by saying I have searched the forum and read all the SUID stuff but it is not in the neighborhood I am looking for.

Here is the problem. We want to grant a non super-user permission to kill root processes but only if the process matches certain criteria. This particular userID is what we use to run several maintenance and data gathering scripts on our systems. The approach we have been taking is to write a C program that is owned by root with the SUID bit set for the user we want to have access to kill root processes.

The program accepts a PID and hostname. It then verifies the PID is owned by root and is a remsh to the given hostname. If it is, it will send a signal to the PID to kill it. I am on Solaris 9 and have tried usign both kill() and sigsend() with no success.

I have been reading on the web and I realize there have been some security changes in this area in the last few years. I do not see anything that would prevent this from working if the effective user is super-user.

Anyone have any ideas? If you have something similar I would love to see some code snippets, especially if you are setting the UID in the program. If anyone can give a reference stating this is not possible, that is cool to. We will explore sudo if that is the case.

Thanks,
Tony

TioTony

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LEARN ABOUT V7

kill

KILL(2) 							System Calls Manual							   KILL(2)

NAME

       kill  -	send signal to a process

SYNOPSIS

       kill(pid, sig);

DESCRIPTION

       Kill sends the signal sig to the process specified by the process number in r0.	See signal(2) for a list of signals.

       The sending and receiving processes must have the same effective user ID, otherwise this call is restricted to the super-user.

       If the process number is 0, the signal is sent to all other processes in the sender's process group; see tty(4).

       If the process number is -1, and the user is the super-user, the signal is broadcast universally except to processes 0 and 1, the scheduler
       and initialization processes, see init(8).

       Processes may send signals to themselves.

SEE ALSO

       signal(2), kill(1)

DIAGNOSTICS

       Zero is returned if the process is killed; -1 is returned if the process does not have the same effective user  ID  and	the  user  is  not
       super-user, or if the process does not exist.

ASSEMBLER

       (kill = 37.)
       (process number in r0)
       sys kill; sig

																	   KILL(2)

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