1 files changed, 114 insertions, 0 deletions
diff --git a/sandbox/win/src/sync_policy.cc b/sandbox/win/src/sync_policy.cc
new file mode 100644
index 0000000..364cf73
--- /dev/null
+++ b/sandbox/win/src/sync_policy.cc
@@ -0,0 +1,114 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <string>
+
+#include "sandbox/src/sync_policy.h"
+
+#include "base/logging.h"
+#include "sandbox/src/ipc_tags.h"
+#include "sandbox/src/policy_engine_opcodes.h"
+#include "sandbox/src/policy_params.h"
+#include "sandbox/src/sandbox_types.h"
+#include "sandbox/src/sandbox_utils.h"
+
+namespace sandbox {
+
+bool SyncPolicy::GenerateRules(const wchar_t* name,
+                               TargetPolicy::Semantics semantics,
+                               LowLevelPolicy* policy) {
+  std::wstring mod_name(name);
+  if (mod_name.empty()) {
+    return false;
+  }
+
+  if (TargetPolicy::EVENTS_ALLOW_ANY != semantics &&
+      TargetPolicy::EVENTS_ALLOW_READONLY != semantics) {
+    // Other flags are not valid for sync policy yet.
+    NOTREACHED();
+    return false;
+  }
+
+  // Add the open rule.
+  EvalResult result = ASK_BROKER;
+  PolicyRule open(result);
+
+  if (!open.AddStringMatch(IF, OpenEventParams::NAME, name, CASE_INSENSITIVE))
+    return false;
+
+  if (TargetPolicy::EVENTS_ALLOW_READONLY == semantics) {
+    // We consider all flags that are not known to be readonly as potentially
+    // used for write.
+    DWORD allowed_flags = SYNCHRONIZE | GENERIC_READ | READ_CONTROL;
+    DWORD restricted_flags = ~allowed_flags;
+    open.AddNumberMatch(IF_NOT, OpenEventParams::ACCESS, restricted_flags, AND);
+  }
+
+  if (!policy->AddRule(IPC_OPENEVENT_TAG, &open))
+    return false;
+
+  // If it's not a read only, add the create rule.
+  if (TargetPolicy::EVENTS_ALLOW_READONLY != semantics) {
+    PolicyRule create(result);
+    if (!create.AddStringMatch(IF, NameBased::NAME, name, CASE_INSENSITIVE))
+      return false;
+
+    if (!policy->AddRule(IPC_CREATEEVENT_TAG, &create))
+      return false;
+  }
+
+  return true;
+}
+
+DWORD SyncPolicy::CreateEventAction(EvalResult eval_result,
+                                    const ClientInfo& client_info,
+                                    const std::wstring &event_name,
+                                    uint32 manual_reset,
+                                    uint32 initial_state,
+                                    HANDLE *handle) {
+  // The only action supported is ASK_BROKER which means create the requested
+  // file as specified.
+  if (ASK_BROKER != eval_result)
+    return false;
+
+  HANDLE local_handle = ::CreateEvent(NULL, manual_reset, initial_state,
+                                     event_name.c_str());
+  if (NULL == local_handle)
+    return ::GetLastError();
+
+  if (!::DuplicateHandle(::GetCurrentProcess(), local_handle,
+                         client_info.process, handle, 0, FALSE,
+                         DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
+    ::CloseHandle(local_handle);
+    return ERROR_ACCESS_DENIED;
+  }
+  return ERROR_SUCCESS;
+}
+
+DWORD SyncPolicy::OpenEventAction(EvalResult eval_result,
+                                  const ClientInfo& client_info,
+                                  const std::wstring &event_name,
+                                  uint32 desired_access,
+                                  uint32 inherit_handle,
+                                  HANDLE *handle) {
+  // The only action supported is ASK_BROKER which means create the requested
+  // file as specified.
+  if (ASK_BROKER != eval_result)
+    return false;
+
+  HANDLE local_handle = ::OpenEvent(desired_access, FALSE,
+                                    event_name.c_str());
+  if (NULL == local_handle)
+    return ::GetLastError();
+
+  if (!::DuplicateHandle(::GetCurrentProcess(), local_handle,
+                         client_info.process, handle, 0, inherit_handle,
+                         DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
+    ::CloseHandle(local_handle);
+    return ERROR_ACCESS_DENIED;
+  }
+  return ERROR_SUCCESS;
+}
+
+}  // namespace sandbox