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/* $OpenBSD: unveil-chroot.c,v 1.1.1.1 2019/08/01 15:20:51 bluhm Exp $ */
/*
* Copyright (c) 2019 Alexander Bluhm <bluhm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
char *root, *dir, *file, *path = NULL;
if (argc != 3 && argc != 4)
errx(2, "usage: unveil-chroot root dir [file]");
root = argv[1];
dir = argv[2];
file = argv[3];
if (file != NULL) {
if (asprintf(&path, "%s/%s", dir, file) == -1)
err(1, "asprintf");
}
if (chroot(root) == -1)
err(1, "chroot %s", root);
if (unveil(dir, "") == -1)
err(1, "unveil %s", dir);
if (file != NULL) {
if (open(path, O_RDONLY) != -1)
errx(1, "open %s succeeded", path);
if (errno != ENOENT)
err(1, "open %s error", path);
}
return 0;
}
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