You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
1.8 KiB
69 lines
1.8 KiB
/*
|
|
* This was written by Andrew G. Morgan <morgan@kernel.org>
|
|
*
|
|
* 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)
|
|
{
|
|
fprintf(stderr,
|
|
"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 <morgan@kernel.org>]\n");
|
|
|
|
exit(1);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
cap_t new_caps;
|
|
|
|
/* this program should not be made setuid-0 */
|
|
if (getuid() && !geteuid()) {
|
|
usage();
|
|
}
|
|
|
|
/* check that we have at least 2 arguments */
|
|
if (argc < 3) {
|
|
usage();
|
|
}
|
|
|
|
/* 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");
|
|
usage();
|
|
}
|
|
|
|
/* set these capabilities for the current process */
|
|
if (cap_set_proc(new_caps) != 0) {
|
|
fprintf(stderr, "unable to set capabilities: %s\n", strerror(errno));
|
|
usage();
|
|
}
|
|
|
|
/* 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));
|
|
|
|
usage();
|
|
|
|
return 0;
|
|
}
|