The Tor Browser: security/sandbox/win/src/handle

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.

     2 // Use of this source code is governed by a BSD-style license that can be

     3 // found in the LICENSE file.

     5 #include "sandbox/win/src/handle_policy.h"

     7 #include <string>

     9 #include "base/win/scoped_handle.h"

    10 #include "sandbox/win/src/broker_services.h"

    11 #include "sandbox/win/src/ipc_tags.h"

    12 #include "sandbox/win/src/policy_engine_opcodes.h"

    13 #include "sandbox/win/src/policy_params.h"

    14 #include "sandbox/win/src/sandbox_types.h"

    15 #include "sandbox/win/src/sandbox_utils.h"

    17 namespace sandbox {

    19 bool HandlePolicy::GenerateRules(const wchar_t* type_name,

    20                                  TargetPolicy::Semantics semantics,

    21                                  LowLevelPolicy* policy) {

    22   PolicyRule duplicate_rule(ASK_BROKER);

    24   switch (semantics) {

    25     case TargetPolicy::HANDLES_DUP_ANY: {

    26       if (!duplicate_rule.AddNumberMatch(IF_NOT, HandleTarget::TARGET,

    27                                          ::GetCurrentProcessId(), EQUAL)) {

    28         return false;

    29       }

    30       break;

    31     }

    33     case TargetPolicy::HANDLES_DUP_BROKER: {

    34       if (!duplicate_rule.AddNumberMatch(IF, HandleTarget::TARGET,

    35                                          ::GetCurrentProcessId(), EQUAL)) {

    36         return false;

    37       }

    38       break;

    39     }

    41     default:

    42      return false;

    43   }

    44   if (!duplicate_rule.AddStringMatch(IF, HandleTarget::NAME, type_name,

    45                                      CASE_INSENSITIVE)) {

    46     return false;

    47   }

    48   if (!policy->AddRule(IPC_DUPLICATEHANDLEPROXY_TAG, &duplicate_rule)) {

    49     return false;

    50   }

    51   return true;

    52 }

    54 DWORD HandlePolicy::DuplicateHandleProxyAction(EvalResult eval_result,

    55                                                const ClientInfo& client_info,

    56                                                HANDLE source_handle,

    57                                                DWORD target_process_id,

    58                                                HANDLE* target_handle,

    59                                                DWORD desired_access,

    60                                                DWORD options) {

    61   // The only action supported is ASK_BROKER which means duplicate the handle.

    62   if (ASK_BROKER != eval_result) {

    63     return ERROR_ACCESS_DENIED;

    64   }

    66   base::win::ScopedHandle remote_target_process;

    67   if (target_process_id != ::GetCurrentProcessId()) {

    68     // Sandboxed children are dynamic, so we check that manually.

    69     if (!BrokerServicesBase::GetInstance()->IsActiveTarget(target_process_id)) {

    70       return ERROR_ACCESS_DENIED;

    71     }

    73     remote_target_process.Set(::OpenProcess(PROCESS_DUP_HANDLE, FALSE,

    74                                             target_process_id));

    75     if (!remote_target_process.IsValid())

    76       return ::GetLastError();

    77   }

    79   // If the policy didn't block us and we have no valid target, then the broker

    80   // (this process) is the valid target.

    81   HANDLE target_process = remote_target_process.IsValid() ?

    82                           remote_target_process.Get() : ::GetCurrentProcess();

    83   DWORD result = ERROR_SUCCESS;

    84   if (!::DuplicateHandle(client_info.process, source_handle, target_process,

    85                          target_handle, desired_access, FALSE,

    86                          options)) {

    87     return ::GetLastError();

    88   }

    90   return ERROR_SUCCESS;

    91 }

    93 }  // namespace sandbox

The Tor Browser / file revision