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