add missing file

#include "config.h"

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <pwd.h>

#include <unistd.h>

#include "auth.h"

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

    if (argc != 4) {

        printf("usage: %s <config_file> <OIDC token> <command>\n", argv[0]);

        exit(1);

    }

    int res = parse_config(argv[1], &config);

    if (res == 1) {

        printf("cannot parse config file\n");

        exit(1);

    }

    oidc_token_content_t token_info;

    res = verify_token(argv[2], &token_info);

    cJSON_Delete(config.parsed_object);

    if (res == 1) {

        printf("cannot verify token\n");

        exit(1);

    }

    char *uname = malloc(sizeof(char) * 4);

    strncpy(uname, token_info.user, 3);

    uname[3] = 0;

    struct passwd *pwd = getpwnam(uname);

    if (pwd == NULL) {

        printf("Cannot find UID for name %s\n", uname);

        free(uname);

        exit(1);

    }

    printf("Executing command \"%s\" as %s(%d)\n", argv[3], uname, pwd->pw_uid);

    free(token_info.user);

    free(uname);

    setuid(pwd->pw_uid);

    system(argv[3]);

}