Index: chrome/browser/net/packed_ct_ev_whitelist.cc |
diff --git a/chrome/browser/net/packed_ct_ev_whitelist.cc b/chrome/browser/net/packed_ct_ev_whitelist.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..12e76fbcf36892c0377efa9bd1426d40a28ad185 |
--- /dev/null |
+++ b/chrome/browser/net/packed_ct_ev_whitelist.cc |
@@ -0,0 +1,175 @@ |
+// Copyright 2014 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 "chrome/browser/net/packed_ct_ev_whitelist.h" |
+ |
+#include <set> |
+ |
+#include "base/big_endian.h" |
+#include "base/bind.h" |
+#include "base/file_util.h" |
+#include "base/lazy_instance.h" |
+#include "base/logging.h" |
+#include "content/public/browser/browser_thread.h" |
+#include "net/ssl/ssl_config_service.h" |
+ |
+namespace { |
+const uint8_t kCertHashLengthBits = 64; // 8 bytes |
+const uint64_t kGolombMParameterBits = 47; // 2^47 |
+} // namespace |
+ |
+namespace internal { |
+ |
+BitStreamReader::BitStreamReader(const base::StringPiece& source) |
+ : source_(source), current_byte_(0), current_bit_(7) { |
+} |
+ |
+bool BitStreamReader::ReadUnaryEncoding(uint64_t* out) { |
+ uint64_t res = 0; |
+ if (BitsLeft() == 0) |
+ return false; |
+ |
+ while ((BitsLeft() > 0) && ReadBit()) |
+ res++; |
+ |
+ *out = res; |
+ return true; |
+} |
+ |
+bool BitStreamReader::ReadBits(uint8_t num_bits, uint64_t* out) { |
+ if (num_bits > 64) |
+ return false; |
+ |
+ if (BitsLeft() < num_bits) |
+ return false; |
+ |
+ uint64_t res = 0; |
+ for (uint8_t i = 0; i < num_bits; ++i) |
+ res |= (static_cast<uint64_t>(ReadBit()) << (num_bits - (i + 1))); |
+ |
+ *out = res; |
+ return true; |
+} |
+ |
+uint64_t BitStreamReader::BitsLeft() const { |
+ if (current_byte_ == source_.length()) |
+ return 0; |
+ return (source_.length() - (current_byte_ + 1)) * 8 + current_bit_ + 1; |
+} |
+ |
+uint8_t BitStreamReader::ReadBit() { |
+ DCHECK_GT(BitsLeft(), 0u); |
+ DCHECK(current_bit_ < 8 && current_bit_ >= 0); |
+ uint8_t res = |
+ (source_.data()[current_byte_] & (1 << current_bit_)) >> current_bit_; |
+ current_bit_--; |
+ if (current_bit_ < 0) { |
+ current_byte_++; |
+ current_bit_ = 7; |
+ } |
+ |
+ return res; |
+} |
+ |
+void SetNewEVWhitelistInSSLConfigService( |
+ scoped_refptr<net::ct::EVCertsWhitelist> new_whitelist, |
+ scoped_refptr<net::SSLConfigService> ssl_config_service) { |
+ if (ssl_config_service.get() != NULL) { |
+ ssl_config_service->SetEVCertsWhitelist(new_whitelist); |
+ } |
+} |
+ |
+} // namespace internal |
+ |
+void SetEVWhitelistFromFile( |
+ const base::FilePath& compressed_whitelist_file, |
+ scoped_refptr<net::SSLConfigService> ssl_config_service) { |
+ VLOG(1) << "Setting EV whitelist from file: " |
+ << compressed_whitelist_file.value(); |
+ std::string compressed_list; |
+ if (!base::ReadFileToString(compressed_whitelist_file, &compressed_list)) { |
+ VLOG(1) << "Failed reading from " << compressed_whitelist_file.value(); |
+ return; |
+ } |
+ |
+ scoped_refptr<net::ct::EVCertsWhitelist> new_whitelist( |
+ new PackedEVCertsWhitelist(compressed_list)); |
+ if (!new_whitelist->IsValid()) { |
+ VLOG(1) << "Failed uncompressing EV certs whitelist."; |
+ return; |
+ } |
+ |
+ base::Callback<void(void)> assign_cb = |
+ base::Bind(&internal::SetNewEVWhitelistInSSLConfigService, |
+ new_whitelist, |
+ ssl_config_service); |
+ content::BrowserThread::PostTask( |
+ content::BrowserThread::IO, FROM_HERE, assign_cb); |
+} |
+ |
+bool PackedEVCertsWhitelist::UncompressEVWhitelist( |
+ const std::string& compressed_whitelist, |
+ std::set<std::string>* uncompressed_list) { |
+ internal::BitStreamReader reader(base::StringPiece( |
+ compressed_whitelist.data(), compressed_whitelist.size())); |
+ std::set<std::string> result; |
+ |
+ VLOG(1) << "Uncompressing EV whitelist of size " |
+ << compressed_whitelist.size(); |
+ uint64_t curr_hash(0); |
+ if (!reader.ReadBits(kCertHashLengthBits, &curr_hash)) { |
+ VLOG(1) << "Failed reading first hash."; |
+ return false; |
+ } |
+ char hash_bytes[8]; |
+ base::WriteBigEndian(hash_bytes, curr_hash); |
+ result.insert(std::string(hash_bytes, 8)); |
+ static const uint64_t M = static_cast<uint64_t>(1) << kGolombMParameterBits; |
+ |
+ while (reader.BitsLeft() > kGolombMParameterBits) { |
+ uint64_t read_prefix = 0; |
+ if (!reader.ReadUnaryEncoding(&read_prefix)) { |
+ VLOG(1) << "Failed reading unary-encoded prefix."; |
+ return false; |
+ } |
+ |
+ uint64_t r = 0; |
+ if (!reader.ReadBits(kGolombMParameterBits, &r)) { |
+ VLOG(1) << "Failed reading " << kGolombMParameterBits << " bits."; |
+ return false; |
+ } |
+ |
+ uint64_t curr_diff = read_prefix * M + r; |
+ curr_hash += curr_diff; |
+ |
+ base::WriteBigEndian(hash_bytes, curr_hash); |
+ result.insert(std::string(hash_bytes, 8)); |
+ } |
+ |
+ uncompressed_list->swap(result); |
+ return true; |
+} |
+ |
+PackedEVCertsWhitelist::PackedEVCertsWhitelist( |
+ const std::string& compressed_whitelist) |
+ : is_whitelist_valid_(false) { |
+ std::set<std::string> new_whitelist; |
+ if (!UncompressEVWhitelist(compressed_whitelist, &new_whitelist)) |
+ return; |
+ |
+ whitelist_.swap(new_whitelist); |
+ is_whitelist_valid_ = true; |
+} |
+ |
+PackedEVCertsWhitelist::~PackedEVCertsWhitelist() { |
+} |
+ |
+bool PackedEVCertsWhitelist::ContainsCertificateHash( |
+ const std::string& certificate_hash) const { |
+ return whitelist_.find(certificate_hash) != whitelist_.end(); |
+} |
+ |
+bool PackedEVCertsWhitelist::IsValid() const { |
+ return is_whitelist_valid_; |
+} |