1/* $OpenBSD: sandbox-rlimit.c,v 1.3 2011/06/23 09:34:13 djm Exp $ */
2/*
3 * Copyright (c) 2011 Damien Miller <djm@mindrot.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include "includes.h"
19
20#ifdef SANDBOX_RLIMIT
21
22#include <sys/types.h>
23#include <sys/param.h>
24#include <sys/time.h>
25#include <sys/resource.h>
26
27#include <errno.h>
28#include <stdarg.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32#include <unistd.h>
33
34#include "log.h"
35#include "ssh-sandbox.h"
36#include "xmalloc.h"
37
38/* Minimal sandbox that sets zero nfiles, nprocs and filesize rlimits */
39
40struct ssh_sandbox {
41	pid_t child_pid;
42};
43
44struct ssh_sandbox *
45ssh_sandbox_init(void)
46{
47	struct ssh_sandbox *box;
48
49	/*
50	 * Strictly, we don't need to maintain any state here but we need
51	 * to return non-NULL to satisfy the API.
52	 */
53	debug3("%s: preparing rlimit sandbox", __func__);
54	box = xcalloc(1, sizeof(*box));
55	box->child_pid = 0;
56
57	return box;
58}
59
60void
61ssh_sandbox_child(struct ssh_sandbox *box)
62{
63	struct rlimit rl_zero;
64
65	rl_zero.rlim_cur = rl_zero.rlim_max = 0;
66
67#ifndef SANDBOX_SKIP_RLIMIT_FSIZE
68	if (setrlimit(RLIMIT_FSIZE, &rl_zero) == -1)
69		fatal("%s: setrlimit(RLIMIT_FSIZE, { 0, 0 }): %s",
70			__func__, strerror(errno));
71#endif
72	if (setrlimit(RLIMIT_NOFILE, &rl_zero) == -1)
73		fatal("%s: setrlimit(RLIMIT_NOFILE, { 0, 0 }): %s",
74			__func__, strerror(errno));
75#ifdef HAVE_RLIMIT_NPROC
76	if (setrlimit(RLIMIT_NPROC, &rl_zero) == -1)
77		fatal("%s: setrlimit(RLIMIT_NPROC, { 0, 0 }): %s",
78			__func__, strerror(errno));
79#endif
80}
81
82void
83ssh_sandbox_parent_finish(struct ssh_sandbox *box)
84{
85	free(box);
86	debug3("%s: finished", __func__);
87}
88
89void
90ssh_sandbox_parent_preauth(struct ssh_sandbox *box, pid_t child_pid)
91{
92	box->child_pid = child_pid;
93}
94
95#endif /* SANDBOX_RLIMIT */
96