michael@0: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "sandbox/win/src/handle_policy.h"
michael@0: 
michael@0: #include <string>
michael@0: 
michael@0: #include "base/win/scoped_handle.h"
michael@0: #include "sandbox/win/src/broker_services.h"
michael@0: #include "sandbox/win/src/ipc_tags.h"
michael@0: #include "sandbox/win/src/policy_engine_opcodes.h"
michael@0: #include "sandbox/win/src/policy_params.h"
michael@0: #include "sandbox/win/src/sandbox_types.h"
michael@0: #include "sandbox/win/src/sandbox_utils.h"
michael@0: 
michael@0: namespace sandbox {
michael@0: 
michael@0: bool HandlePolicy::GenerateRules(const wchar_t* type_name,
michael@0:                                  TargetPolicy::Semantics semantics,
michael@0:                                  LowLevelPolicy* policy) {
michael@0:   PolicyRule duplicate_rule(ASK_BROKER);
michael@0: 
michael@0:   switch (semantics) {
michael@0:     case TargetPolicy::HANDLES_DUP_ANY: {
michael@0:       if (!duplicate_rule.AddNumberMatch(IF_NOT, HandleTarget::TARGET,
michael@0:                                          ::GetCurrentProcessId(), EQUAL)) {
michael@0:         return false;
michael@0:       }
michael@0:       break;
michael@0:     }
michael@0: 
michael@0:     case TargetPolicy::HANDLES_DUP_BROKER: {
michael@0:       if (!duplicate_rule.AddNumberMatch(IF, HandleTarget::TARGET,
michael@0:                                          ::GetCurrentProcessId(), EQUAL)) {
michael@0:         return false;
michael@0:       }
michael@0:       break;
michael@0:     }
michael@0: 
michael@0:     default:
michael@0:      return false;
michael@0:   }
michael@0:   if (!duplicate_rule.AddStringMatch(IF, HandleTarget::NAME, type_name,
michael@0:                                      CASE_INSENSITIVE)) {
michael@0:     return false;
michael@0:   }
michael@0:   if (!policy->AddRule(IPC_DUPLICATEHANDLEPROXY_TAG, &duplicate_rule)) {
michael@0:     return false;
michael@0:   }
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: DWORD HandlePolicy::DuplicateHandleProxyAction(EvalResult eval_result,
michael@0:                                                const ClientInfo& client_info,
michael@0:                                                HANDLE source_handle,
michael@0:                                                DWORD target_process_id,
michael@0:                                                HANDLE* target_handle,
michael@0:                                                DWORD desired_access,
michael@0:                                                DWORD options) {
michael@0:   // The only action supported is ASK_BROKER which means duplicate the handle.
michael@0:   if (ASK_BROKER != eval_result) {
michael@0:     return ERROR_ACCESS_DENIED;
michael@0:   }
michael@0: 
michael@0:   base::win::ScopedHandle remote_target_process;
michael@0:   if (target_process_id != ::GetCurrentProcessId()) {
michael@0:     // Sandboxed children are dynamic, so we check that manually.
michael@0:     if (!BrokerServicesBase::GetInstance()->IsActiveTarget(target_process_id)) {
michael@0:       return ERROR_ACCESS_DENIED;
michael@0:     }
michael@0: 
michael@0:     remote_target_process.Set(::OpenProcess(PROCESS_DUP_HANDLE, FALSE,
michael@0:                                             target_process_id));
michael@0:     if (!remote_target_process.IsValid())
michael@0:       return ::GetLastError();
michael@0:   }
michael@0: 
michael@0:   // If the policy didn't block us and we have no valid target, then the broker
michael@0:   // (this process) is the valid target.
michael@0:   HANDLE target_process = remote_target_process.IsValid() ?
michael@0:                           remote_target_process.Get() : ::GetCurrentProcess();
michael@0:   DWORD result = ERROR_SUCCESS;
michael@0:   if (!::DuplicateHandle(client_info.process, source_handle, target_process,
michael@0:                          target_handle, desired_access, FALSE,
michael@0:                          options)) {
michael@0:     return ::GetLastError();
michael@0:   }
michael@0: 
michael@0:   return ERROR_SUCCESS;
michael@0: }
michael@0: 
michael@0: }  // namespace sandbox
michael@0: