crypto/openssh/platform-tracing.c

   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 #if defined(HAVE_SYS_PRCTL_H)
  21 #include <sys/prctl.h>  /* For prctl() and PR_SET_DUMPABLE */
  22 #endif
  23 #ifdef HAVE_SYS_PTRACE_H
  24 #include <sys/ptrace.h>
  25 #endif
  26 #ifdef HAVE_PRIV_H
  27 #include <priv.h> /* For setpflags() and __PROC_PROTECT  */
  28 #endif
  29 #include <stdarg.h>
  30
  31 #include "log.h"
  32
  33 void
  34 platform_disable_tracing(int strict)
  35 {
  36 #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
  37         /* Disable ptrace on Linux without sgid bit */
  38         if (prctl(PR_SET_DUMPABLE, 0) != 0 && strict)
  39                 fatal("unable to make the process undumpable");
  40 #endif
  41 #if defined(HAVE_SETPFLAGS) && defined(__PROC_PROTECT)
  42         /* On Solaris, we should make this process untraceable */
  43         if (setpflags(__PROC_PROTECT, 1) != 0 && strict)
  44                 fatal("unable to make the process untraceable");
  45 #endif
  46 #ifdef PT_DENY_ATTACH
  47         /* Mac OS X */
  48         if (ptrace(PT_DENY_ATTACH, 0, 0, 0) == -1 && strict)
  49                 fatal("unable to set PT_DENY_ATTACH");
  50 #endif
  51 }