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2f5a215771
Differential Revision: https://phabricator.services.mozilla.com/D44269 --HG-- extra : moz-landing-system : lando
159 lines
4.6 KiB
C++
159 lines
4.6 KiB
C++
/*
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* Copyright 2015, Mozilla Foundation and contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include <vector>
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#include <string>
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#include "ClearKeyCDM.h"
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#include "ClearKeySessionManager.h"
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// This include is required in order for content_decryption_module to work
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// on Unix systems.
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#include "stddef.h"
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#include "content_decryption_module.h"
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#include "content_decryption_module_ext.h"
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#ifndef XP_WIN
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# include <sys/types.h>
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# include <sys/stat.h>
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# include <unistd.h>
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#endif
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#ifdef ENABLE_WMF
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# include "WMFUtils.h"
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#endif // ENABLE_WMF
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extern "C" {
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CDM_API
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void INITIALIZE_CDM_MODULE() {}
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static bool sCanReadHostVerificationFiles = false;
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CDM_API
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void* CreateCdmInstance(int cdm_interface_version, const char* key_system,
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uint32_t key_system_size,
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GetCdmHostFunc get_cdm_host_func, void* user_data) {
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CK_LOGE("ClearKey CreateCDMInstance");
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if (cdm_interface_version != cdm::ContentDecryptionModule_10::kVersion) {
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CK_LOGE(
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"ClearKey CreateCDMInstance failed due to requesting unsupported "
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"version %d.",
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cdm_interface_version);
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return nullptr;
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}
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#ifdef ENABLE_WMF
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if (!wmf::EnsureLibs()) {
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CK_LOGE("Required libraries were not found");
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return nullptr;
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}
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#endif
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#ifdef MOZILLA_OFFICIAL
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// Test that we're able to read the host files.
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if (!sCanReadHostVerificationFiles) {
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return nullptr;
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}
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#endif
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cdm::Host_10* host = static_cast<cdm::Host_10*>(
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get_cdm_host_func(cdm_interface_version, user_data));
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ClearKeyCDM* clearKey = new ClearKeyCDM(host);
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CK_LOGE("Created ClearKeyCDM instance!");
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return clearKey;
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}
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const size_t TEST_READ_SIZE = 16 * 1024;
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bool CanReadSome(cdm::PlatformFile aFile) {
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std::vector<uint8_t> data;
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data.resize(TEST_READ_SIZE);
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#ifdef XP_WIN
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DWORD bytesRead = 0;
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return ReadFile(aFile, &data.front(), TEST_READ_SIZE, &bytesRead, nullptr) &&
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bytesRead > 0;
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#else
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return read(aFile, &data.front(), TEST_READ_SIZE) > 0;
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#endif
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}
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void ClosePlatformFile(cdm::PlatformFile aFile) {
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#ifdef XP_WIN
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CloseHandle(aFile);
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#else
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close(aFile);
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#endif
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}
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static uint32_t NumExpectedHostFiles(const cdm::HostFile* aHostFiles,
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uint32_t aNumFiles) {
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#if !defined(XP_WIN)
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// We expect 4 binaries: clearkey, libxul, plugin-container, and Firefox.
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return 4;
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#else
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// Windows running x64 or x86 natively should also have 4 as above.
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// For Windows on ARM64, we run an x86 plugin-contianer process under
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// emulation, and so we expect one additional binary; the x86
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// xul.dll used by plugin-container.exe.
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bool i686underAArch64 = false;
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// Assume that we're running under x86 emulation on an aarch64 host if
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// one of the paths ends with the x86 plugin-container path we'd expect.
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const std::wstring plugincontainer = L"i686\\plugin-container.exe";
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for (uint32_t i = 0; i < aNumFiles; i++) {
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const cdm::HostFile& hostFile = aHostFiles[i];
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if (hostFile.file != cdm::kInvalidPlatformFile) {
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std::wstring path = hostFile.file_path;
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auto offset = path.find(plugincontainer);
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if (offset != std::string::npos &&
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offset == path.size() - plugincontainer.size()) {
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i686underAArch64 = true;
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break;
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}
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}
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}
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return i686underAArch64 ? 5 : 4;
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#endif
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}
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CDM_API
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bool VerifyCdmHost_0(const cdm::HostFile* aHostFiles, uint32_t aNumFiles) {
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// Check that we've received the expected number of host files.
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bool rv = (aNumFiles == NumExpectedHostFiles(aHostFiles, aNumFiles));
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// Verify that each binary is readable inside the sandbox,
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// and close the handle.
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for (uint32_t i = 0; i < aNumFiles; i++) {
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const cdm::HostFile& hostFile = aHostFiles[i];
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if (hostFile.file != cdm::kInvalidPlatformFile) {
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if (!CanReadSome(hostFile.file)) {
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rv = false;
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}
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ClosePlatformFile(hostFile.file);
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}
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if (hostFile.sig_file != cdm::kInvalidPlatformFile) {
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ClosePlatformFile(hostFile.sig_file);
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}
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}
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sCanReadHostVerificationFiles = rv;
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return rv;
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}
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} // extern "C".
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