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