343 lines
14 KiB
C++
343 lines
14 KiB
C++
// Copyright 2017 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#include "packager/media/base/playready_key_source.h"
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#include <openssl/aes.h>
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#include <algorithm>
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#include "packager/base/base64.h"
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#include "packager/base/logging.h"
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#include "packager/base/strings/string_number_conversions.h"
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#include "packager/base/strings/string_util.h"
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#include "packager/media/base/buffer_writer.h"
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#include "packager/media/base/http_key_fetcher.h"
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namespace shaka {
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namespace media {
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namespace {
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const uint32_t kHttpFetchTimeout = 60; // In seconds
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const std::string kPlayHeaderObject_4_1 = "<WRMHEADER "
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"xmlns=\"http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader\" "
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"version=\"4.1.0.0\"><DATA><PROTECTINFO>"
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"<KID VALUE=\"$0\" ALGID=\"AESCTR\" CHECKSUM=\"$1\"></KID></PROTECTINFO>"
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"</DATA></WRMHEADER>";
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const std::string kPlayHeaderObject_4_0 = "<WRMHEADER "
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"xmlns=\"http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader\" "
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"version=\"4.0.0.0\"><DATA><PROTECTINFO><KEYLEN>16</KEYLEN>"
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"<ALGID>AESCTR</ALGID></PROTECTINFO><KID>$0</KID><CHECKSUM>$1</CHECKSUM>"
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"</DATA></WRMHEADER>";
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const std::string kAcquireLicenseRequest =
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"<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
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"<soap:Envelope xmlns=\"http://schemas.xmlsoap.org/soap/envelope/\" "
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"xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" "
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"xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" "
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"xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
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"<soap:Body>"
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"<AcquirePackagingData "
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"xmlns=\"http://schemas.microsoft.com/DRM/2007/03/protocols\">"
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"<challenge "
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"xmlns=\"http://schemas.microsoft.com/DRM"
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"/2007/03/protocols/AcquirePackagingData/v1.0\">"
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"<ProtectionSystems>"
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"<ProtectionSystemId>9A04F079-9840-4286-AB92-E65BE0885F95"
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"</ProtectionSystemId>"
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"</ProtectionSystems>"
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"<StreamProtectionRequests>"
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"<StreamInformation>"
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"<ProgramIdentifier>$0</ProgramIdentifier>"
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"<OffsetFromProgramStart>P0S</OffsetFromProgramStart>"
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"</StreamInformation>"
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"</StreamProtectionRequests>"
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"</challenge>"
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"</AcquirePackagingData>"
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"</soap:Body>"
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"</soap:Envelope>";
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bool Base64StringToBytes(const std::string& base64_string,
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std::vector<uint8_t>* bytes) {
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DCHECK(bytes);
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std::string str;
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if (!base::Base64Decode(base64_string, &str))
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return false;
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bytes->assign(str.begin(), str.end());
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return true;
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}
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// Converts the key_id's endianness.
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std::vector<uint8_t> ConvertGuidEndianness(const std::vector<uint8_t>& input) {
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std::vector<uint8_t> output = input;
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if (output.size() > 7) { // Defensive check.
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output[0] = input[3];
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output[1] = input[2];
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output[2] = input[1];
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output[3] = input[0];
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output[4] = input[5];
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output[5] = input[4];
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output[6] = input[7];
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output[7] = input[6];
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// 8-15 are an array of bytes with no endianness.
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}
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return output;
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}
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// Generates the data section of a PlayReady PSSH.
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// PlayReady PSSH Data is a PlayReady Header Object.
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// Format is outlined in the following document.
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// http://download.microsoft.com/download/2/3/8/238F67D9-1B8B-48D3-AB83-9C00112268B2/PlayReady%20Header%20Object%202015-08-13-FINAL-CL.PDF
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Status GeneratePlayReadyPsshData(const std::vector<uint8_t>& key_id,
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const std::vector<uint8_t>& key,
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std::vector<uint8_t>* output) {
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CHECK(output);
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std::vector<uint8_t> key_id_converted = ConvertGuidEndianness(key_id);
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std::vector<uint8_t> encrypted_key_id(key_id_converted.size());
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std::unique_ptr<AES_KEY> aes_key (new AES_KEY);
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CHECK_EQ(AES_set_encrypt_key(key.data(), key.size() * 8, aes_key.get()), 0);
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AES_ecb_encrypt(key_id_converted.data(), encrypted_key_id.data(),
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aes_key.get(), AES_ENCRYPT);
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std::string checksum = std::string(encrypted_key_id.begin(),
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encrypted_key_id.end()).substr(0, 8);
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std::string base64_checksum;
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base::Base64Encode(checksum, &base64_checksum);
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std::string base64_key_id;
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base::Base64Encode(std::string(key_id_converted.begin(),
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key_id_converted.end()),
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&base64_key_id);
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std::string playready_header = kPlayHeaderObject_4_0;
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base::ReplaceFirstSubstringAfterOffset(
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&playready_header, 0, "$0", base64_key_id);
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base::ReplaceFirstSubstringAfterOffset(
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&playready_header, 0, "$1", base64_checksum);
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// Create a PlayReady Record.
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// Outline in section '2.PlayReady Records' of
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// 'PlayReady Header Object' document. Note data is in little endian format.
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std::vector<uint16_t> record_value =
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std::vector<uint16_t>(playready_header.begin(), playready_header.end());
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BufferWriter writer_pr_record;
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uint16_t record_type = 1; // Indicates that the record contains a rights management header.
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uint16_t record_length = record_value.size() * 2;
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writer_pr_record.AppendInt(static_cast<uint8_t>(record_type & 0xff));
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writer_pr_record.AppendInt(static_cast<uint8_t>((record_type >> 8) & 0xff));
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writer_pr_record.AppendInt(static_cast<uint8_t>(record_length & 0xff));
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writer_pr_record.AppendInt(static_cast<uint8_t>((record_length >> 8) & 0xff));
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for (auto record_item: record_value) {
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writer_pr_record.AppendInt(static_cast<uint8_t>(record_item & 0xff));
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writer_pr_record.AppendInt(static_cast<uint8_t>((record_item >> 8) & 0xff));
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}
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// Create the PlayReady Header object.
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// Outline in section '1.PlayReady Header Objects' of
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// 'PlayReady Header Object' document. Note data is in little endian format.
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BufferWriter writer_pr_header_object;
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uint32_t playready_header_length = writer_pr_record.Size() + 4 + 2;
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uint16_t record_count = 1;
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writer_pr_header_object.AppendInt(
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static_cast<uint8_t>(playready_header_length & 0xff));
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writer_pr_header_object.AppendInt(
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static_cast<uint8_t>((playready_header_length >> 8) & 0xff));
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writer_pr_header_object.AppendInt(
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static_cast<uint8_t>((playready_header_length >> 16) & 0xff));
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writer_pr_header_object.AppendInt(
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static_cast<uint8_t>((playready_header_length >> 24) & 0xff));
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writer_pr_header_object.AppendInt(
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static_cast<uint8_t>(record_count & 0xff));
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writer_pr_header_object.AppendInt(
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static_cast<uint8_t>((record_count >> 8) & 0xff));
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writer_pr_header_object.AppendBuffer(writer_pr_record);
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*output = std::vector<uint8_t>(writer_pr_header_object.Buffer(),
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writer_pr_header_object.Buffer() +
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writer_pr_header_object.Size());
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return Status::OK;
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}
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} // namespace
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PlayReadyKeySource::PlayReadyKeySource(
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const std::string& server_url)
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: encryption_key_(new EncryptionKey),
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server_url_(server_url) {
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}
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PlayReadyKeySource::PlayReadyKeySource(const std::string& server_url,
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const std::string& client_cert_file,
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const std::string& client_cert_private_key_file,
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const std::string& client_cert_private_key_password)
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: encryption_key_(new EncryptionKey),
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server_url_(server_url),
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client_cert_file_(client_cert_file),
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client_cert_private_key_file_(client_cert_private_key_file),
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client_cert_private_key_password_(client_cert_private_key_password) {
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}
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PlayReadyKeySource::PlayReadyKeySource(
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std::unique_ptr<EncryptionKey> encryption_key)
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: encryption_key_(std::move(encryption_key)) {
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}
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PlayReadyKeySource::~PlayReadyKeySource() {}
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std::unique_ptr<PlayReadyKeySource> PlayReadyKeySource::CreateFromKeyAndKeyId(
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const std::vector<uint8_t>& key_id,
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const std::vector<uint8_t>& key) {
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std::unique_ptr<EncryptionKey> encryption_key(new EncryptionKey);
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encryption_key->key_id = key_id;
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encryption_key->key = key;
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std::vector<uint8_t> pssh_data;
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Status status = GeneratePlayReadyPsshData(
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encryption_key->key_id, encryption_key->key, &pssh_data);
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if (!status.ok()) {
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LOG(ERROR) << status.ToString();
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return std::unique_ptr<PlayReadyKeySource>();
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}
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ProtectionSystemSpecificInfo info;
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info.add_key_id(encryption_key->key_id);
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info.set_system_id(kPlayReadySystemId, arraysize(kPlayReadySystemId));
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info.set_pssh_data(pssh_data);
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encryption_key->key_system_info.push_back(info);
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return std::unique_ptr<PlayReadyKeySource>(
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new PlayReadyKeySource(std::move(encryption_key)));
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}
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Status RetrieveTextInXMLElement(const std::string& element,
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const std::string& xml,
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std::string* value) {
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std::string start_tag = "<" + element + ">";
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std::string end_tag = "</" + element + ">";
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std::size_t start_pos = xml.find(start_tag);
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if (start_pos == std::string::npos) {
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return Status(error::SERVER_ERROR,
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"Unable to find tag: " + start_tag);
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}
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start_pos += start_tag.size();
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std::size_t end_pos = xml.find(end_tag);
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if (end_pos == std::string::npos) {
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return Status(error::SERVER_ERROR,
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"Unable to find tag: " + end_tag);
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}
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if (start_pos > end_pos) {
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return Status(error::SERVER_ERROR, "Invalid positions");
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}
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std::size_t segment_len = end_pos - start_pos;
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*value = xml.substr(start_pos, segment_len);
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return Status::OK;
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}
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Status SetKeyInformationFromServerResponse(const std::string& response,
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EncryptionKey* encryption_key) {
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// TODO(robinconnell): Currently all tracks are encrypted using the same
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// key_id and key. Add the ability to retrieve multiple key_id/keys from
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// the packager response and encrypt multiple tracks using differnt
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// key_id/keys.
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std::string key_id_hex;
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Status status = RetrieveTextInXMLElement("KeyId", response, &key_id_hex);
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if (!status.ok()) {
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return status;
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}
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key_id_hex.erase(
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std::remove(key_id_hex.begin(), key_id_hex.end(), '-'), key_id_hex.end());
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std::string key_data_b64;
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status = RetrieveTextInXMLElement("KeyData", response, &key_data_b64);
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if (!status.ok()) {
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LOG(ERROR) << "Key retreiving KeyData";
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return status;
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}
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std::string pssh_data_b64;
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status = RetrieveTextInXMLElement("Data", response, &pssh_data_b64);
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if (!status.ok()) {
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LOG(ERROR) << "Key retreiving Data";
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return status;
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}
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if (!base::HexStringToBytes(key_id_hex, &encryption_key->key_id)) {
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LOG(ERROR) << "Cannot parse key_id_hex, " << key_id_hex;
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return Status(error::SERVER_ERROR, "Cannot parse key_id_hex.");
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}
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if (!Base64StringToBytes(key_data_b64, &encryption_key->key)) {
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LOG(ERROR) << "Cannot parse key, " << key_data_b64;
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return Status(error::SERVER_ERROR, "Cannot parse key.");
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}
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std::vector<uint8_t> pssh_data;
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if (!Base64StringToBytes(pssh_data_b64, &pssh_data)) {
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LOG(ERROR) << "Cannot parse pssh data, " << pssh_data_b64;
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return Status(error::SERVER_ERROR, "Cannot parse pssh.");
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}
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ProtectionSystemSpecificInfo info;
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info.add_key_id(encryption_key->key_id);
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info.set_system_id(kPlayReadySystemId, arraysize(kPlayReadySystemId));
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info.set_pssh_data(pssh_data);
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encryption_key->key_system_info.push_back(info);
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return Status::OK;
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}
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Status PlayReadyKeySource::FetchKeysWithProgramIdentifier(
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const std::string& program_identifier) {
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std::unique_ptr<EncryptionKey> encryption_key(new EncryptionKey);
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HttpKeyFetcher key_fetcher(kHttpFetchTimeout);
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if (!client_cert_file_.empty() && !client_cert_private_key_file_.empty()) {
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key_fetcher.SetClientCertInfo(client_cert_file_,
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client_cert_private_key_file_,
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client_cert_private_key_password_);
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}
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if (!ca_file_.empty()) {
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key_fetcher.SetCaFile(ca_file_);
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}
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std::string acquire_license_request = kAcquireLicenseRequest;
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base::ReplaceFirstSubstringAfterOffset(
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&acquire_license_request, 0, "$0", program_identifier);
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std::string acquire_license_response;
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Status status = key_fetcher.FetchKeys(server_url_, acquire_license_request,
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&acquire_license_response);
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if (!status.ok()) {
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LOG(ERROR) << "Server response: " << acquire_license_response;
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return status;
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}
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status = SetKeyInformationFromServerResponse(acquire_license_response,
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encryption_key.get());
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encryption_key_ = std::move(encryption_key);
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return Status::OK;
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}
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Status PlayReadyKeySource::FetchKeys(EmeInitDataType init_data_type,
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const std::vector<uint8_t>& init_data) {
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// Do nothing for playready encryption/decryption.
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return Status::OK;
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}
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Status PlayReadyKeySource::GetKey(const std::string& stream_label,
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EncryptionKey* key) {
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// TODO(robinconnell): Currently all tracks are encrypted using the same
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// key_id and key. Add the ability to encrypt each stream_label using a
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// different key_id and key.
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DCHECK(key);
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DCHECK(encryption_key_);
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*key = *encryption_key_;
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return Status::OK;
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}
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Status PlayReadyKeySource::GetKey(const std::vector<uint8_t>& key_id,
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EncryptionKey* key) {
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// TODO(robinconnell): Currently all tracks are encrypted using the same
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// key_id and key. Add the ability to encrypt using multiple key_id/keys.
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DCHECK(key);
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DCHECK(encryption_key_);
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*key = *encryption_key_;
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return Status::OK;
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}
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Status PlayReadyKeySource::GetCryptoPeriodKey(uint32_t crypto_period_index,
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const std::string& stream_label,
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EncryptionKey* key) {
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// TODO(robinconnell): Implement key rotation.
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*key = *encryption_key_;
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return Status::OK;
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}
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} // namespace media
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} // namespace shaka
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