1323134Sdes/* $OpenBSD: sandbox-rlimit.c,v 1.4 2016/09/12 01:22:38 deraadt Exp $ */ 2225825Sdes/* 3225825Sdes * Copyright (c) 2011 Damien Miller <djm@mindrot.org> 4225825Sdes * 5225825Sdes * Permission to use, copy, modify, and distribute this software for any 6225825Sdes * purpose with or without fee is hereby granted, provided that the above 7225825Sdes * copyright notice and this permission notice appear in all copies. 8225825Sdes * 9225825Sdes * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10225825Sdes * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11225825Sdes * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12225825Sdes * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13225825Sdes * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14225825Sdes * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15225825Sdes * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16225825Sdes */ 17225825Sdes 18225825Sdes#include "includes.h" 19225825Sdes 20225825Sdes#ifdef SANDBOX_RLIMIT 21225825Sdes 22225825Sdes#include <sys/types.h> 23225825Sdes#include <sys/time.h> 24225825Sdes#include <sys/resource.h> 25225825Sdes 26225825Sdes#include <errno.h> 27225825Sdes#include <stdarg.h> 28225825Sdes#include <stdio.h> 29225825Sdes#include <stdlib.h> 30225825Sdes#include <string.h> 31225825Sdes#include <unistd.h> 32225825Sdes 33225825Sdes#include "log.h" 34225825Sdes#include "ssh-sandbox.h" 35225825Sdes#include "xmalloc.h" 36225825Sdes 37225825Sdes/* Minimal sandbox that sets zero nfiles, nprocs and filesize rlimits */ 38225825Sdes 39225825Sdesstruct ssh_sandbox { 40225825Sdes pid_t child_pid; 41225825Sdes}; 42225825Sdes 43225825Sdesstruct ssh_sandbox * 44261320Sdesssh_sandbox_init(struct monitor *monitor) 45225825Sdes{ 46225825Sdes struct ssh_sandbox *box; 47225825Sdes 48225825Sdes /* 49225825Sdes * Strictly, we don't need to maintain any state here but we need 50225825Sdes * to return non-NULL to satisfy the API. 51225825Sdes */ 52225825Sdes debug3("%s: preparing rlimit sandbox", __func__); 53225825Sdes box = xcalloc(1, sizeof(*box)); 54225825Sdes box->child_pid = 0; 55225825Sdes 56225825Sdes return box; 57225825Sdes} 58225825Sdes 59225825Sdesvoid 60225825Sdesssh_sandbox_child(struct ssh_sandbox *box) 61225825Sdes{ 62225825Sdes struct rlimit rl_zero; 63225825Sdes 64225825Sdes rl_zero.rlim_cur = rl_zero.rlim_max = 0; 65225825Sdes 66240075Sdes#ifndef SANDBOX_SKIP_RLIMIT_FSIZE 67225825Sdes if (setrlimit(RLIMIT_FSIZE, &rl_zero) == -1) 68225825Sdes fatal("%s: setrlimit(RLIMIT_FSIZE, { 0, 0 }): %s", 69225825Sdes __func__, strerror(errno)); 70240075Sdes#endif 71261320Sdes#ifndef SANDBOX_SKIP_RLIMIT_NOFILE 72225825Sdes if (setrlimit(RLIMIT_NOFILE, &rl_zero) == -1) 73225825Sdes fatal("%s: setrlimit(RLIMIT_NOFILE, { 0, 0 }): %s", 74225825Sdes __func__, strerror(errno)); 75261320Sdes#endif 76225825Sdes#ifdef HAVE_RLIMIT_NPROC 77225825Sdes if (setrlimit(RLIMIT_NPROC, &rl_zero) == -1) 78225825Sdes fatal("%s: setrlimit(RLIMIT_NPROC, { 0, 0 }): %s", 79225825Sdes __func__, strerror(errno)); 80225825Sdes#endif 81225825Sdes} 82225825Sdes 83225825Sdesvoid 84225825Sdesssh_sandbox_parent_finish(struct ssh_sandbox *box) 85225825Sdes{ 86225825Sdes free(box); 87225825Sdes debug3("%s: finished", __func__); 88225825Sdes} 89225825Sdes 90225825Sdesvoid 91225825Sdesssh_sandbox_parent_preauth(struct ssh_sandbox *box, pid_t child_pid) 92225825Sdes{ 93225825Sdes box->child_pid = child_pid; 94225825Sdes} 95225825Sdes 96225825Sdes#endif /* SANDBOX_RLIMIT */ 97