deraadt@openbsd.org | 9136ec1 | 2016-09-12 01:22:38 +0000 | [diff] [blame^] | 1 | /* $OpenBSD: sandbox-rlimit.c,v 1.4 2016/09/12 01:22:38 deraadt Exp $ */ |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 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> |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 23 | #include <sys/time.h> |
| 24 | #include <sys/resource.h> |
| 25 | |
| 26 | #include <errno.h> |
| 27 | #include <stdarg.h> |
| 28 | #include <stdio.h> |
| 29 | #include <stdlib.h> |
| 30 | #include <string.h> |
| 31 | #include <unistd.h> |
| 32 | |
| 33 | #include "log.h" |
Damien Miller | dcbd41e | 2011-06-23 19:45:51 +1000 | [diff] [blame] | 34 | #include "ssh-sandbox.h" |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 35 | #include "xmalloc.h" |
| 36 | |
| 37 | /* Minimal sandbox that sets zero nfiles, nprocs and filesize rlimits */ |
| 38 | |
| 39 | struct ssh_sandbox { |
| 40 | pid_t child_pid; |
| 41 | }; |
| 42 | |
| 43 | struct ssh_sandbox * |
Damien Miller | 868ea1e | 2014-01-17 16:47:04 +1100 | [diff] [blame] | 44 | ssh_sandbox_init(struct monitor *monitor) |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 45 | { |
| 46 | struct ssh_sandbox *box; |
| 47 | |
| 48 | /* |
| 49 | * Strictly, we don't need to maintain any state here but we need |
| 50 | * to return non-NULL to satisfy the API. |
| 51 | */ |
| 52 | debug3("%s: preparing rlimit sandbox", __func__); |
| 53 | box = xcalloc(1, sizeof(*box)); |
| 54 | box->child_pid = 0; |
| 55 | |
| 56 | return box; |
| 57 | } |
| 58 | |
| 59 | void |
| 60 | ssh_sandbox_child(struct ssh_sandbox *box) |
| 61 | { |
| 62 | struct rlimit rl_zero; |
| 63 | |
| 64 | rl_zero.rlim_cur = rl_zero.rlim_max = 0; |
| 65 | |
Darren Tucker | d545a4b | 2012-07-03 22:48:31 +1000 | [diff] [blame] | 66 | #ifndef SANDBOX_SKIP_RLIMIT_FSIZE |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 67 | if (setrlimit(RLIMIT_FSIZE, &rl_zero) == -1) |
| 68 | fatal("%s: setrlimit(RLIMIT_FSIZE, { 0, 0 }): %s", |
| 69 | __func__, strerror(errno)); |
Darren Tucker | d545a4b | 2012-07-03 22:48:31 +1000 | [diff] [blame] | 70 | #endif |
Damien Miller | 2035b22 | 2014-01-26 09:39:53 +1100 | [diff] [blame] | 71 | #ifndef SANDBOX_SKIP_RLIMIT_NOFILE |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 72 | if (setrlimit(RLIMIT_NOFILE, &rl_zero) == -1) |
| 73 | fatal("%s: setrlimit(RLIMIT_NOFILE, { 0, 0 }): %s", |
| 74 | __func__, strerror(errno)); |
Damien Miller | 2035b22 | 2014-01-26 09:39:53 +1100 | [diff] [blame] | 75 | #endif |
Damien Miller | 69ff1df | 2011-06-23 08:30:03 +1000 | [diff] [blame] | 76 | #ifdef HAVE_RLIMIT_NPROC |
| 77 | if (setrlimit(RLIMIT_NPROC, &rl_zero) == -1) |
| 78 | fatal("%s: setrlimit(RLIMIT_NPROC, { 0, 0 }): %s", |
| 79 | __func__, strerror(errno)); |
| 80 | #endif |
| 81 | } |
| 82 | |
| 83 | void |
| 84 | ssh_sandbox_parent_finish(struct ssh_sandbox *box) |
| 85 | { |
| 86 | free(box); |
| 87 | debug3("%s: finished", __func__); |
| 88 | } |
| 89 | |
| 90 | void |
| 91 | ssh_sandbox_parent_preauth(struct ssh_sandbox *box, pid_t child_pid) |
| 92 | { |
| 93 | box->child_pid = child_pid; |
| 94 | } |
| 95 | |
| 96 | #endif /* SANDBOX_RLIMIT */ |