The Tor Browser: security/sandbox/win/src/process_thread_interception.cc@6474c204b198 (annotated)

security/sandbox/win/src/process_thread_interception.cc@6474c204b198 (annotated)

security/sandbox/win/src/process_thread_interception.cc

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

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

 // Copyright (c) 2006-2011 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 "sandbox/win/src/process_thread_interception.h"
 #include "sandbox/win/src/crosscall_client.h"
 #include "sandbox/win/src/ipc_tags.h"
 #include "sandbox/win/src/policy_params.h"
 #include "sandbox/win/src/policy_target.h"
 #include "sandbox/win/src/sandbox_factory.h"
 #include "sandbox/win/src/sandbox_nt_util.h"
 #include "sandbox/win/src/sharedmem_ipc_client.h"
 #include "sandbox/win/src/target_services.h"
 namespace sandbox {
 SANDBOX_INTERCEPT NtExports g_nt;
 // Hooks NtOpenThread and proxy the call to the broker if it's trying to
 // open a thread in the same process.
 NTSTATUS WINAPI TargetNtOpenThread(NtOpenThreadFunction orig_OpenThread,
                                    PHANDLE thread, ACCESS_MASK desired_access,
                                    POBJECT_ATTRIBUTES object_attributes,
                                    PCLIENT_ID client_id) {
   NTSTATUS status = orig_OpenThread(thread, desired_access, object_attributes,
                                     client_id);
   if (NT_SUCCESS(status))
     return status;
   do {
     if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
       break;
     if (!client_id)
       break;
     uint32 thread_id = 0;
     bool should_break = false;
     __try {
       // We support only the calls for the current process
       if (NULL != client_id->UniqueProcess)
         should_break = true;
       // Object attributes should be NULL or empty.
       if (!should_break && NULL != object_attributes) {
         if (0 != object_attributes->Attributes ||
             NULL != object_attributes->ObjectName ||
             NULL != object_attributes->RootDirectory ||
             NULL != object_attributes->SecurityDescriptor ||
             NULL != object_attributes->SecurityQualityOfService) {
           should_break = true;
         }
       }
       thread_id = static_cast<uint32>(
                       reinterpret_cast<ULONG_PTR>(client_id->UniqueThread));
     } __except(EXCEPTION_EXECUTE_HANDLER) {
       break;
     }
     if (should_break)
       break;
     if (!ValidParameter(thread, sizeof(HANDLE), WRITE))
       break;
     void* memory = GetGlobalIPCMemory();
     if (NULL == memory)
       break;
     SharedMemIPCClient ipc(memory);
     CrossCallReturn answer = {0};
     ResultCode code = CrossCall(ipc, IPC_NTOPENTHREAD_TAG, desired_access,
                                 thread_id, &answer);
     if (SBOX_ALL_OK != code)
       break;
     if (!NT_SUCCESS(answer.nt_status))
       // The nt_status here is most likely STATUS_INVALID_CID because
       // in the broker we set the process id in the CID (client ID) param
       // to be the current process. If you try to open a thread from another
       // process you will get this INVALID_CID error. On the other hand, if you
       // try to open a thread in your own process, it should return success.
       // We don't want to return STATUS_INVALID_CID here, so we return the
       // return of the original open thread status, which is most likely
       // STATUS_ACCESS_DENIED.
       break;
     __try {
       // Write the output parameters.
       *thread = answer.handle;
     } __except(EXCEPTION_EXECUTE_HANDLER) {
       break;
     }
     return answer.nt_status;
   } while (false);
   return status;
 }
 // Hooks NtOpenProcess and proxy the call to the broker if it's trying to
 // open the current process.
 NTSTATUS WINAPI TargetNtOpenProcess(NtOpenProcessFunction orig_OpenProcess,
                                    PHANDLE process, ACCESS_MASK desired_access,
                                    POBJECT_ATTRIBUTES object_attributes,
                                    PCLIENT_ID client_id) {
   NTSTATUS status = orig_OpenProcess(process, desired_access, object_attributes,
                                      client_id);
   if (NT_SUCCESS(status))
     return status;
   do {
     if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
       break;
     if (!client_id)
       break;
     uint32 process_id = 0;
     bool should_break = false;
     __try {
       // Object attributes should be NULL or empty.
       if (!should_break && NULL != object_attributes) {
         if (0 != object_attributes->Attributes ||
             NULL != object_attributes->ObjectName ||
             NULL != object_attributes->RootDirectory ||
             NULL != object_attributes->SecurityDescriptor ||
             NULL != object_attributes->SecurityQualityOfService) {
           should_break = true;
         }
       }
       process_id = static_cast<uint32>(
                       reinterpret_cast<ULONG_PTR>(client_id->UniqueProcess));
     } __except(EXCEPTION_EXECUTE_HANDLER) {
       break;
     }
     if (should_break)
       break;
     if (!ValidParameter(process, sizeof(HANDLE), WRITE))
       break;
     void* memory = GetGlobalIPCMemory();
     if (NULL == memory)
       break;
     SharedMemIPCClient ipc(memory);
     CrossCallReturn answer = {0};
     ResultCode code = CrossCall(ipc, IPC_NTOPENPROCESS_TAG, desired_access,
                                 process_id, &answer);
     if (SBOX_ALL_OK != code)
       break;
     if (!NT_SUCCESS(answer.nt_status))
       return answer.nt_status;
     __try {
       // Write the output parameters.
       *process = answer.handle;
     } __except(EXCEPTION_EXECUTE_HANDLER) {
       break;
     }
     return answer.nt_status;
   } while (false);
   return status;
 }
 NTSTATUS WINAPI TargetNtOpenProcessToken(
     NtOpenProcessTokenFunction orig_OpenProcessToken, HANDLE process,
     ACCESS_MASK desired_access, PHANDLE token) {
   NTSTATUS status = orig_OpenProcessToken(process, desired_access, token);
   if (NT_SUCCESS(status))
     return status;
   do {
     if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
       break;
     if (CURRENT_PROCESS != process)
       break;
     if (!ValidParameter(token, sizeof(HANDLE), WRITE))
       break;
     void* memory = GetGlobalIPCMemory();
     if (NULL == memory)
       break;
     SharedMemIPCClient ipc(memory);
     CrossCallReturn answer = {0};
     ResultCode code = CrossCall(ipc, IPC_NTOPENPROCESSTOKEN_TAG, process,
                                 desired_access, &answer);
     if (SBOX_ALL_OK != code)
       break;
     if (!NT_SUCCESS(answer.nt_status))
       return answer.nt_status;
     __try {
       // Write the output parameters.
       *token = answer.handle;
     } __except(EXCEPTION_EXECUTE_HANDLER) {
       break;
     }
     return answer.nt_status;
   } while (false);
   return status;
 }
 NTSTATUS WINAPI TargetNtOpenProcessTokenEx(
     NtOpenProcessTokenExFunction orig_OpenProcessTokenEx, HANDLE process,
     ACCESS_MASK desired_access, ULONG handle_attributes, PHANDLE token) {
   NTSTATUS status = orig_OpenProcessTokenEx(process, desired_access,
                                             handle_attributes, token);
   if (NT_SUCCESS(status))
     return status;
   do {
     if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
       break;
     if (CURRENT_PROCESS != process)
       break;
     if (!ValidParameter(token, sizeof(HANDLE), WRITE))
       break;
     void* memory = GetGlobalIPCMemory();
     if (NULL == memory)
       break;
     SharedMemIPCClient ipc(memory);
     CrossCallReturn answer = {0};
     ResultCode code = CrossCall(ipc, IPC_NTOPENPROCESSTOKENEX_TAG, process,
                                 desired_access, handle_attributes, &answer);
     if (SBOX_ALL_OK != code)
       break;
     if (!NT_SUCCESS(answer.nt_status))
       return answer.nt_status;
     __try {
       // Write the output parameters.
       *token = answer.handle;
     } __except(EXCEPTION_EXECUTE_HANDLER) {
       break;
     }
     return answer.nt_status;
   } while (false);
   return status;
 }
 BOOL WINAPI TargetCreateProcessW(CreateProcessWFunction orig_CreateProcessW,
                                  LPCWSTR application_name, LPWSTR command_line,
                                  LPSECURITY_ATTRIBUTES process_attributes,
                                  LPSECURITY_ATTRIBUTES thread_attributes,
                                  BOOL inherit_handles, DWORD flags,
                                  LPVOID environment, LPCWSTR current_directory,
                                  LPSTARTUPINFOW startup_info,
                                  LPPROCESS_INFORMATION process_information) {
   if (orig_CreateProcessW(application_name, command_line, process_attributes,
                           thread_attributes, inherit_handles, flags,
                           environment, current_directory, startup_info,
                           process_information)) {
     return TRUE;
   }
   DWORD original_error = ::GetLastError();
   // We don't trust that the IPC can work this early.
   if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
     return FALSE;
   do {
     if (!ValidParameter(process_information, sizeof(PROCESS_INFORMATION),
                         WRITE))
       break;
     void* memory = GetGlobalIPCMemory();
     if (NULL == memory)
       break;
     const wchar_t* cur_dir = NULL;
     wchar_t current_directory[MAX_PATH];
     DWORD result = ::GetCurrentDirectory(MAX_PATH, current_directory);
     if (0 != result && result < MAX_PATH)
       cur_dir = current_directory;
     SharedMemIPCClient ipc(memory);
     CrossCallReturn answer = {0};
     InOutCountedBuffer proc_info(process_information,
                                  sizeof(PROCESS_INFORMATION));
     ResultCode code = CrossCall(ipc, IPC_CREATEPROCESSW_TAG, application_name,
                                 command_line, cur_dir, proc_info, &answer);
     if (SBOX_ALL_OK != code)
       break;
     ::SetLastError(answer.win32_result);
     if (ERROR_SUCCESS != answer.win32_result)
       return FALSE;
     return TRUE;
   } while (false);
   ::SetLastError(original_error);
   return FALSE;
 }
 BOOL WINAPI TargetCreateProcessA(CreateProcessAFunction orig_CreateProcessA,
                                  LPCSTR application_name, LPSTR command_line,
                                  LPSECURITY_ATTRIBUTES process_attributes,
                                  LPSECURITY_ATTRIBUTES thread_attributes,
                                  BOOL inherit_handles, DWORD flags,
                                  LPVOID environment, LPCSTR current_directory,
                                  LPSTARTUPINFOA startup_info,
                                  LPPROCESS_INFORMATION process_information) {
   if (orig_CreateProcessA(application_name, command_line, process_attributes,
                           thread_attributes, inherit_handles, flags,
                           environment, current_directory, startup_info,
                           process_information)) {
     return TRUE;
   }
   DWORD original_error = ::GetLastError();
   // We don't trust that the IPC can work this early.
   if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
     return FALSE;
   do {
     if (!ValidParameter(process_information, sizeof(PROCESS_INFORMATION),
                         WRITE))
       break;
     void* memory = GetGlobalIPCMemory();
     if (NULL == memory)
       break;
     // Convert the input params to unicode.
     UNICODE_STRING *cmd_unicode = NULL;
     UNICODE_STRING *app_unicode = NULL;
     if (command_line) {
       cmd_unicode = AnsiToUnicode(command_line);
       if (!cmd_unicode)
         break;
     }
     if (application_name) {
       app_unicode = AnsiToUnicode(application_name);
       if (!app_unicode) {
         operator delete(cmd_unicode, NT_ALLOC);
         break;
       }
     }
     const wchar_t* cmd_line = cmd_unicode ? cmd_unicode->Buffer : NULL;
     const wchar_t* app_name = app_unicode ? app_unicode->Buffer : NULL;
     const wchar_t* cur_dir = NULL;
     wchar_t current_directory[MAX_PATH];
     DWORD result = ::GetCurrentDirectory(MAX_PATH, current_directory);
     if (0 != result && result < MAX_PATH)
       cur_dir = current_directory;
     SharedMemIPCClient ipc(memory);
     CrossCallReturn answer = {0};
     InOutCountedBuffer proc_info(process_information,
                                  sizeof(PROCESS_INFORMATION));
     ResultCode code = CrossCall(ipc, IPC_CREATEPROCESSW_TAG, app_name,
                                 cmd_line, cur_dir, proc_info, &answer);
     operator delete(cmd_unicode, NT_ALLOC);
     operator delete(app_unicode, NT_ALLOC);
     if (SBOX_ALL_OK != code)
       break;
     ::SetLastError(answer.win32_result);
     if (ERROR_SUCCESS != answer.win32_result)
       return FALSE;
     return TRUE;
   } while (false);
   ::SetLastError(original_error);
   return FALSE;
 }
 // Creates a thread without registering with CSRSS. This is required if we
 // closed the CSRSS ALPC port after lockdown.
 HANDLE WINAPI TargetCreateThread(CreateThreadFunction orig_CreateThread,
                                  LPSECURITY_ATTRIBUTES thread_attributes,
                                  SIZE_T stack_size,
                                  LPTHREAD_START_ROUTINE start_address,
                                  PVOID parameter,
                                  DWORD creation_flags,
                                  LPDWORD thread_id) {
 // Try the normal CreateThread; switch to RtlCreateUserThread if needed.
   static bool use_create_thread = true;
   HANDLE thread;
   if (use_create_thread) {
     thread = orig_CreateThread(thread_attributes, stack_size, start_address,
                                parameter, creation_flags, thread_id);
     if (thread)
       return thread;
   }
   PSECURITY_DESCRIPTOR sd =
       thread_attributes ? thread_attributes->lpSecurityDescriptor : NULL;
   CLIENT_ID client_id;
   NTSTATUS result = g_nt.RtlCreateUserThread(NtCurrentProcess, sd,
                                              creation_flags & CREATE_SUSPENDED,
 , stack_size, 0, start_address,
                                              parameter, &thread, &client_id);
   if (!NT_SUCCESS(result))
     return 0;
   // CSRSS is closed if we got here, so use RtlCreateUserThread from here on.
   use_create_thread = false;
   if (thread_id)
     *thread_id = HandleToUlong(client_id.UniqueThread);
   return thread;
 }
 // Cache the default LCID to avoid pinging CSRSS after lockdown.
 // TODO(jschuh): This approach will miss a default locale changes after
 // lockdown. In the future we may want to have the broker check instead.
 LCID WINAPI TargetGetUserDefaultLCID(
     GetUserDefaultLCIDFunction orig_GetUserDefaultLCID) {
   static LCID default_lcid = orig_GetUserDefaultLCID();
   return default_lcid;
 }
 }  // namespace sandbox

The Tor Browser / annotate

security/sandbox/win/src/process_thread_interception.cc@6474c204b198 (annotated)

security/sandbox/win/src/process_thread_interception.cc