/* sush.c - setuid shell executor

**

** v2 by Pegasus Epsilon <pegasus@pimpninjas.org>

** (C) 2013 Distribute Unmodified

** http://pegasus.pimpninjas.org/license

*/

#define TRUE 1

#define _XOPEN_SOURCE 600

/* >= 500 for setreuid() */

/* >= 600 for setenv(), unsetenv() */

#include <sys/types.h> /* geteuid(), setreuid() */

#include <unistd.h> /* geteuid(), setreuid() */

#include <stdio.h> /* perror() */

#include <stdlib.h> /* setenv(), unsetenv(), getenv() */

#include <pwd.h> /* struct passwd, getpwuid() */

int main(int argc, char *argv[], char *envp[]) {

uid_t uid;

struct passwd *pwd;

uid = geteuid();

if (setreuid(uid, uid))

perror("failed to set uid");

pwd = getpwuid(uid);

setenv("HOME", pwd->pw_dir, TRUE);

unsetenv("HISTFILE");

if (execve(getenv("SHELL"), argv, envp))

perror("failed to exec shell");

return -1;

}