1/*
2 * Copyright (c) 2016 Darren Tucker.  All rights reserved.
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include "includes.h"
18
19#include <sys/types.h>
20#ifdef HAVE_SYS_PROCCTL_H
21#include <sys/procctl.h>
22#endif
23#if defined(HAVE_SYS_PRCTL_H)
24#include <sys/prctl.h>	/* For prctl() and PR_SET_DUMPABLE */
25#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