1284345Ssjg/*
2284345Ssjg * Copyright (c) 2016 Darren Tucker.  All rights reserved.
3284345Ssjg *
4284345Ssjg * Permission to use, copy, modify, and distribute this software for any
5284345Ssjg * purpose with or without fee is hereby granted, provided that the above
6284345Ssjg * copyright notice and this permission notice appear in all copies.
7284345Ssjg *
8284345Ssjg * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9284345Ssjg * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10284345Ssjg * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11284345Ssjg * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12284345Ssjg * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13284345Ssjg * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14284345Ssjg * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15284345Ssjg */
16284345Ssjg
17284345Ssjg#include "includes.h"
18284345Ssjg
19284345Ssjg#include <sys/types.h>
20284345Ssjg#ifdef HAVE_SYS_PROCCTL_H
21284345Ssjg#include <sys/procctl.h>
22284345Ssjg#endif
23284345Ssjg#if defined(HAVE_SYS_PRCTL_H)
24284345Ssjg#include <sys/prctl.h>	/* For prctl() and PR_SET_DUMPABLE */
25284345Ssjg#endif
26#ifdef HAVE_SYS_PTRACE_H
27#include <sys/ptrace.h>
28#endif
29#ifdef HAVE_PRIV_H
30#include <priv.h> /* For setpflags() and __PROC_PROTECT  */
31#endif
32#include <stdarg.h>
33#include <stdio.h>
34#include <string.h>
35#include <unistd.h>
36
37#include "log.h"
38
39void
40platform_disable_tracing(int strict)
41{
42#if defined(HAVE_PROCCTL) && defined(PROC_TRACE_CTL)
43	/* On FreeBSD, we should make this process untraceable */
44	int disable_trace = PROC_TRACE_CTL_DISABLE;
45
46	/*
47	 * On FreeBSD, we should make this process untraceable.
48	 * pid=0 means "this process" but some older kernels do not
49	 * understand that so retry with our own pid before failing.
50	 */
51	if (procctl(P_PID, 0, PROC_TRACE_CTL, &disable_trace) == 0)
52		return;
53	if (procctl(P_PID, getpid(), PROC_TRACE_CTL, &disable_trace) == 0)
54		return;
55	if (strict)
56		fatal("unable to make the process untraceable: %s",
57		    strerror(errno));
58#endif
59#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
60	/* Disable ptrace on Linux without sgid bit */
61	if (prctl(PR_SET_DUMPABLE, 0) != 0 && strict)
62		fatal("unable to make the process undumpable: %s",
63		    strerror(errno));
64#endif
65#if defined(HAVE_SETPFLAGS) && defined(__PROC_PROTECT)
66	/* On Solaris, we should make this process untraceable */
67	if (setpflags(__PROC_PROTECT, 1) != 0 && strict)
68		fatal("unable to make the process untraceable: %s",
69		    strerror(errno));
70#endif
71#ifdef PT_DENY_ATTACH
72	/* Mac OS X */
73	if (ptrace(PT_DENY_ATTACH, 0, 0, 0) == -1 && strict)
74		fatal("unable to set PT_DENY_ATTACH: %s", strerror(errno));
75#endif
76}
77