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 __RCSID("$NetBSD: sandbox-rlimit.c,v 1.2 2011/09/07 17:49:19 christos Exp $"); 20 #include <sys/types.h> 21 #include <sys/param.h> 22 #include <sys/time.h> 23 #include <sys/resource.h> 24 25 #include <errno.h> 26 #include <stdarg.h> 27 #include <stdio.h> 28 #include <stdlib.h> 29 #include <string.h> 30 #include <unistd.h> 31 32 #include "log.h" 33 #include "ssh-sandbox.h" 34 #include "xmalloc.h" 35 36 /* Minimal sandbox that sets zero nfiles, nprocs and filesize rlimits */ 37 38 struct ssh_sandbox { 39 pid_t child_pid; 40 }; 41 42 struct ssh_sandbox * 43 ssh_sandbox_init(void) 44 { 45 struct ssh_sandbox *box; 46 47 /* 48 * Strictly, we don't need to maintain any state here but we need 49 * to return non-NULL to satisfy the API. 50 */ 51 debug3("%s: preparing rlimit sandbox", __func__); 52 box = xcalloc(1, sizeof(*box)); 53 box->child_pid = 0; 54 55 return box; 56 } 57 58 void 59 ssh_sandbox_child(struct ssh_sandbox *box) 60 { 61 struct rlimit rl_zero; 62 63 rl_zero.rlim_cur = rl_zero.rlim_max = 0; 64 65 if (setrlimit(RLIMIT_FSIZE, &rl_zero) == -1) 66 fatal("%s: setrlimit(RLIMIT_FSIZE, { 0, 0 }): %s", 67 __func__, strerror(errno)); 68 if (setrlimit(RLIMIT_NOFILE, &rl_zero) == -1) 69 fatal("%s: setrlimit(RLIMIT_NOFILE, { 0, 0 }): %s", 70 __func__, strerror(errno)); 71 if (setrlimit(RLIMIT_NPROC, &rl_zero) == -1) 72 fatal("%s: setrlimit(RLIMIT_NPROC, { 0, 0 }): %s", 73 __func__, strerror(errno)); 74 } 75 76 void 77 ssh_sandbox_parent_finish(struct ssh_sandbox *box) 78 { 79 free(box); 80 debug3("%s: finished", __func__); 81 } 82 83 void 84 ssh_sandbox_parent_preauth(struct ssh_sandbox *box, pid_t child_pid) 85 { 86 box->child_pid = child_pid; 87 /* Nothing to do here */ 88 } 89 90