1/* $OpenBSD: sandbox-rlimit.c,v 1.5 2020/10/18 11:32:01 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 1.7 2021/03/05 17:47:16 christos Exp $"); 20#include <sys/types.h> 21#include <sys/time.h> 22#include <sys/resource.h> 23 24#include <errno.h> 25#include <stdarg.h> 26#include <stdio.h> 27#include <stdlib.h> 28#include <string.h> 29#include <unistd.h> 30 31#include "log.h" 32#include "ssh-sandbox.h" 33#include "xmalloc.h" 34 35/* Minimal sandbox that sets zero nfiles, nprocs and filesize rlimits */ 36 37struct ssh_sandbox { 38 pid_t child_pid; 39}; 40 41struct ssh_sandbox * 42ssh_sandbox_init(void) 43{ 44 struct ssh_sandbox *box; 45 46 /* 47 * Strictly, we don't need to maintain any state here but we need 48 * to return non-NULL to satisfy the API. 49 */ 50 debug3_f("preparing rlimit sandbox"); 51 box = xcalloc(1, sizeof(*box)); 52 box->child_pid = 0; 53 54 return box; 55} 56 57void 58ssh_sandbox_child(struct ssh_sandbox *box) 59{ 60 struct rlimit rl_zero; 61 62 rl_zero.rlim_cur = rl_zero.rlim_max = 0; 63 64 if (setrlimit(RLIMIT_FSIZE, &rl_zero) == -1) 65 fatal_f("setrlimit(RLIMIT_FSIZE, { 0, 0 }): %s", 66 strerror(errno)); 67 if (setrlimit(RLIMIT_NOFILE, &rl_zero) == -1) 68 fatal_f("setrlimit(RLIMIT_NOFILE, { 0, 0 }): %s", 69 strerror(errno)); 70 if (setrlimit(RLIMIT_NPROC, &rl_zero) == -1) 71 fatal_f("setrlimit(RLIMIT_NPROC, { 0, 0 }): %s", 72 strerror(errno)); 73} 74 75void 76ssh_sandbox_parent_finish(struct ssh_sandbox *box) 77{ 78 free(box); 79 debug3_f("finished"); 80} 81 82void 83ssh_sandbox_parent_preauth(struct ssh_sandbox *box, pid_t child_pid) 84{ 85 box->child_pid = child_pid; 86 /* Nothing to do here */ 87} 88 89