1 files changed, 139 insertions, 0 deletions
diff --git a/sandbox/src/sync_policy.cc b/sandbox/src/sync_policy.cc
new file mode 100644
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+++ b/sandbox/src/sync_policy.cc
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#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