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/*
* Copyright (c) 2016 Darren Tucker. All rights reserved.
*
* 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"
#include <sys/types.h>
#ifdef HAVE_SYS_PROCCTL_H
#include <sys/procctl.h>
#endif
#if defined(HAVE_SYS_PRCTL_H)
#include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */
#endif
#ifdef HAVE_SYS_PTRACE_H
#include <sys/ptrace.h>
#endif
#ifdef HAVE_PRIV_H
#include <priv.h> /* For setpflags() and __PROC_PROTECT */
#endif
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "log.h"
void
platform_disable_tracing(int strict)
{
#if defined(HAVE_PROCCTL) && defined(PROC_TRACE_CTL)
/* On FreeBSD, we should make this process untraceable */
int disable_trace = PROC_TRACE_CTL_DISABLE;
/*
* On FreeBSD, we should make this process untraceable.
* pid=0 means "this process" but some older kernels do not
* understand that so retry with our own pid before failing.
*/
if (procctl(P_PID, 0, PROC_TRACE_CTL, &disable_trace) == 0)
return;
if (procctl(P_PID, getpid(), PROC_TRACE_CTL, &disable_trace) == 0)
return;
if (strict)
fatal("unable to make the process untraceable: %s",
strerror(errno));
#endif
#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
/* Disable ptrace on Linux without sgid bit */
if (prctl(PR_SET_DUMPABLE, 0) != 0 && strict)
fatal("unable to make the process undumpable: %s",
strerror(errno));
#endif
#if defined(HAVE_SETPFLAGS) && defined(__PROC_PROTECT)
/* On Solaris, we should make this process untraceable */
if (setpflags(__PROC_PROTECT, 1) != 0 && strict)
fatal("unable to make the process untraceable: %s",
strerror(errno));
#endif
#ifdef PT_DENY_ATTACH
/* Mac OS X */
if (ptrace(PT_DENY_ATTACH, 0, 0, 0) == -1 && strict)
fatal("unable to set PT_DENY_ATTACH: %s", strerror(errno));
#endif
}
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