1 files changed, 115 insertions, 0 deletions
diff --git a/widget/cocoa/nsSandboxViolationSink.mm b/widget/cocoa/nsSandboxViolationSink.mm
new file mode 100644
index 000000000..057217334
--- /dev/null
+++ b/widget/cocoa/nsSandboxViolationSink.mm
@@ -0,0 +1,115 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsSandboxViolationSink.h"
+
+#include <unistd.h>
+#include <time.h>
+#include <asl.h>
+#include <dispatch/dispatch.h>
+#include <notify.h>
+#include "nsCocoaDebugUtils.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/Sprintf.h"
+
+int nsSandboxViolationSink::mNotifyToken = 0;
+uint64_t nsSandboxViolationSink::mLastMsgReceived = 0;
+
+void
+nsSandboxViolationSink::Start()
+{
+  if (mNotifyToken) {
+    return;
+  }
+  notify_register_dispatch(SANDBOX_VIOLATION_NOTIFICATION_NAME,
+                           &mNotifyToken,
+                           dispatch_queue_create(SANDBOX_VIOLATION_QUEUE_NAME,
+                                                 DISPATCH_QUEUE_SERIAL),
+                           ^(int token) { ViolationHandler(); });
+}
+
+void
+nsSandboxViolationSink::Stop()
+{
+  if (!mNotifyToken) {
+    return;
+  }
+  notify_cancel(mNotifyToken);
+  mNotifyToken = 0;
+}
+
+// We need to query syslogd to find out what violations occurred, and whether
+// they were "ours".  We can use the Apple System Log facility to do this.
+// Besides calling notify_post("com.apple.sandbox.violation.*"), Apple's
+// sandboxd also reports all sandbox violations (sent to it by the Sandbox
+// kernel extension) to syslogd, which stores them and makes them viewable
+// in the system console.  This is the database we query.
+
+// ViolationHandler() is always called on its own secondary thread.  This
+// makes it unlikely it will interfere with other browser activity.
+
+void
+nsSandboxViolationSink::ViolationHandler()
+{
+  aslmsg query = asl_new(ASL_TYPE_QUERY);
+
+  asl_set_query(query, ASL_KEY_FACILITY, "com.apple.sandbox",
+                ASL_QUERY_OP_EQUAL);
+
+  // Only get reports that were generated very recently.
+  char query_time[30] = {0};
+  SprintfLiteral(query_time, "%li", time(NULL) - 2);
+  asl_set_query(query, ASL_KEY_TIME, query_time,
+                ASL_QUERY_OP_NUMERIC | ASL_QUERY_OP_GREATER_EQUAL);
+
+  // This code is easier to test if we don't just track "our" violations,
+  // which are (normally) few and far between.  For example (for the time
+  // being at least) four appleeventsd sandbox violations happen every time
+  // we start the browser in e10s mode.  But it makes sense to default to
+  // only tracking "our" violations.
+  if (mozilla::Preferences::GetBool(
+      "security.sandbox.mac.track.violations.oursonly", true)) {
+    // This makes each of our processes log its own violations.  It might
+    // be better to make the chrome process log all the other processes'
+    // violations.
+    char query_pid[20] = {0};
+    SprintfLiteral(query_pid, "%u", getpid());
+    asl_set_query(query, ASL_KEY_REF_PID, query_pid, ASL_QUERY_OP_EQUAL);
+  }
+
+  aslresponse response = asl_search(nullptr, query);
+
+  // Each time ViolationHandler() is called we grab as many messages as are
+  // available.  Otherwise we might not get them all.
+  if (response) {
+    while (true) {
+      aslmsg hit = nullptr;
+      aslmsg found = nullptr;
+      const char* id_str;
+
+      while ((hit = aslresponse_next(response))) {
+        // Record the message id to avoid logging the same violation more
+        // than once.
+        id_str = asl_get(hit, ASL_KEY_MSG_ID);
+        uint64_t id_val = atoll(id_str);
+        if (id_val <= mLastMsgReceived) {
+          continue;
+        }
+        mLastMsgReceived = id_val;
+        found = hit;
+        break;
+      }
+      if (!found) {
+        break;
+      }
+
+      const char* pid_str = asl_get(found, ASL_KEY_REF_PID);
+      const char* message_str = asl_get(found, ASL_KEY_MSG);
+      nsCocoaDebugUtils::DebugLog("nsSandboxViolationSink::ViolationHandler(): id %s, pid %s, message %s",
+                                  id_str, pid_str, message_str);
+    }
+    aslresponse_free(response);
+  }
+}