#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

int main(int argc, char *argv[]) {
    /*
       FIX: Bash drops privileges if Real UID != Effective UID.
       We are running setuid root (EUID=0), but Real UID is the user.
       We must promote ourselves to full root (Real UID = E-UID = 0)
       so Bash treats us as root and allows reading the 0700 script.
    */
    if (setuid(0) != 0) {
        perror("Failed to setuid(0)");
        return 1;
    }

    char *script_path = "/usr/lib/z-auth/core.sh";
    char *new_argv[] = { "/bin/bash", script_path, NULL };
    
    extern char **environ;
    execve("/bin/bash", new_argv, environ);
    
    perror("Failed to exec z-auth core script");
    return 1;
}