1 files changed, 76 insertions, 0 deletions
diff --git a/platform-tracing.c b/platform-tracing.c
new file mode 100644
index 0000000..650c7e5
--- /dev/null
+++ b/platform-tracing.c
@@ -0,0 +1,76 @@
+/*
+ * 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
+}