Annotation of src/usr.bin/ssh/sandbox-rlimit.c, Revision 1.4
1.4 ! deraadt 1: /* $OpenBSD: sandbox-rlimit.c,v 1.3 2011/06/23 09:34:13 djm Exp $ */
1.1 djm 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 <sys/types.h>
19: #include <sys/time.h>
20: #include <sys/resource.h>
21:
22: #include <errno.h>
23: #include <stdarg.h>
24: #include <stdio.h>
25: #include <stdlib.h>
26: #include <string.h>
27: #include <unistd.h>
28:
29: #include "log.h"
1.3 djm 30: #include "ssh-sandbox.h"
1.1 djm 31: #include "xmalloc.h"
32:
33: /* Minimal sandbox that sets zero nfiles, nprocs and filesize rlimits */
34:
35: struct ssh_sandbox {
36: pid_t child_pid;
37: };
38:
39: struct ssh_sandbox *
40: ssh_sandbox_init(void)
41: {
42: struct ssh_sandbox *box;
43:
44: /*
45: * Strictly, we don't need to maintain any state here but we need
46: * to return non-NULL to satisfy the API.
47: */
48: debug3("%s: preparing rlimit sandbox", __func__);
49: box = xcalloc(1, sizeof(*box));
50: box->child_pid = 0;
51:
52: return box;
53: }
54:
55: void
56: ssh_sandbox_child(struct ssh_sandbox *box)
57: {
58: struct rlimit rl_zero;
59:
60: rl_zero.rlim_cur = rl_zero.rlim_max = 0;
61:
62: if (setrlimit(RLIMIT_FSIZE, &rl_zero) == -1)
63: fatal("%s: setrlimit(RLIMIT_FSIZE, { 0, 0 }): %s",
64: __func__, strerror(errno));
65: if (setrlimit(RLIMIT_NOFILE, &rl_zero) == -1)
66: fatal("%s: setrlimit(RLIMIT_NOFILE, { 0, 0 }): %s",
67: __func__, strerror(errno));
68: if (setrlimit(RLIMIT_NPROC, &rl_zero) == -1)
69: fatal("%s: setrlimit(RLIMIT_NPROC, { 0, 0 }): %s",
70: __func__, strerror(errno));
71: }
72:
73: void
74: ssh_sandbox_parent_finish(struct ssh_sandbox *box)
75: {
76: free(box);
77: debug3("%s: finished", __func__);
78: }
79:
80: void
81: ssh_sandbox_parent_preauth(struct ssh_sandbox *box, pid_t child_pid)
82: {
83: box->child_pid = child_pid;
84: /* Nothing to do here */
85: }
86: