/* $OpenBSD: sandbox-rlimit.c,v 1.5 2020/10/18 11:32:01 djm Exp $ */ /* * Copyright (c) 2011 Damien Miller * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include "includes.h" __RCSID("$NetBSD: sandbox-rlimit.c,v 1.6.14.1 2023/12/25 12:31:05 martin Exp $"); #include #include #include #include #include #include #include #include #include #include "log.h" #include "ssh-sandbox.h" #include "xmalloc.h" /* Minimal sandbox that sets zero nfiles, nprocs and filesize rlimits */ struct ssh_sandbox { pid_t child_pid; }; struct ssh_sandbox * ssh_sandbox_init(void) { struct ssh_sandbox *box; /* * Strictly, we don't need to maintain any state here but we need * to return non-NULL to satisfy the API. */ debug3_f("preparing rlimit sandbox"); box = xcalloc(1, sizeof(*box)); box->child_pid = 0; return box; } void ssh_sandbox_child(struct ssh_sandbox *box) { struct rlimit rl_zero; rl_zero.rlim_cur = rl_zero.rlim_max = 0; if (setrlimit(RLIMIT_FSIZE, &rl_zero) == -1) fatal_f("setrlimit(RLIMIT_FSIZE, { 0, 0 }): %s", strerror(errno)); if (setrlimit(RLIMIT_NOFILE, &rl_zero) == -1) fatal_f("setrlimit(RLIMIT_NOFILE, { 0, 0 }): %s", strerror(errno)); if (setrlimit(RLIMIT_NPROC, &rl_zero) == -1) fatal_f("setrlimit(RLIMIT_NPROC, { 0, 0 }): %s", strerror(errno)); } void ssh_sandbox_parent_finish(struct ssh_sandbox *box) { free(box); debug3_f("finished"); } void ssh_sandbox_parent_preauth(struct ssh_sandbox *box, pid_t child_pid) { box->child_pid = child_pid; /* Nothing to do here */ }