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- /* $OpenBSD: sandbox-rlimit.c,v 1.5 2020/10/18 11:32:01 djm Exp $ */
- /*
- * Copyright (c) 2011 Damien Miller <djm@mindrot.org>
- *
- * 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"
-
- #ifdef SANDBOX_RLIMIT
-
- #include <sys/types.h>
- #include <sys/time.h>
- #include <sys/resource.h>
-
- #include <errno.h>
- #include <stdarg.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
-
- #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(struct monitor *monitor)
- {
- 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;
-
- #ifndef SANDBOX_SKIP_RLIMIT_FSIZE
- if (setrlimit(RLIMIT_FSIZE, &rl_zero) == -1)
- fatal_f("setrlimit(RLIMIT_FSIZE, { 0, 0 }): %s",
- strerror(errno));
- #endif
- #ifndef SANDBOX_SKIP_RLIMIT_NOFILE
- if (setrlimit(RLIMIT_NOFILE, &rl_zero) == -1)
- fatal_f("setrlimit(RLIMIT_NOFILE, { 0, 0 }): %s",
- strerror(errno));
- #endif
- #ifdef HAVE_RLIMIT_NPROC
- if (setrlimit(RLIMIT_NPROC, &rl_zero) == -1)
- fatal_f("setrlimit(RLIMIT_NPROC, { 0, 0 }): %s",
- strerror(errno));
- #endif
- }
-
- 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;
- }
-
- #endif /* SANDBOX_RLIMIT */
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