blob: 330cc936a87324e6cb55f659f49be6894c68c085 [file] [log] [blame]
* This was written by Andrew G. Morgan <>
* This is a program that is intended to exec a subsequent program.
* The purpose of this 'execcap' wrapper is to limit the inheritable
* capabilities of the exec()'d program. All environment variables
* are inherited.
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <sys/capability.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
static void usage(void)
"usage: execcap <caps> <command-path> [command-args...]\n\n"
" This program is a wrapper that can be used to limit the Inheritable\n"
" capabilities of a program to be executed. Note, this wrapper is\n"
" intended to assist in overcoming a lack of support for filesystem\n"
" capability attributes and should be used to launch other files.\n"
" This program should _NOT_ be made setuid-0.\n\n"
"[Copyright (c) 1998 Andrew G. Morgan <>]\n");
int main(int argc, char **argv)
cap_t new_caps;
/* this program should not be made setuid-0 */
if (getuid() && !geteuid()) {
/* check that we have at least 2 arguments */
if (argc < 3) {
/* parse the first argument to obtain a set of capabilities */
new_caps = cap_from_text(argv[1]);
if (new_caps == NULL) {
fprintf(stderr, "requested capabilities were not recognized\n");
/* set these capabilities for the current process */
if (cap_set_proc(new_caps) != 0) {
fprintf(stderr, "unable to set capabilities: %s\n", strerror(errno));
/* exec the program indicated by args 2 ... */
execvp(argv[2], argv+2);
/* if we fall through to here, our exec failed -- announce the fact */
fprintf(stderr, "Unable to execute command: %s\n", strerror(errno));
return 0;