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..1fb07dc155a6a879e8c656f84c59ee59cc190274 |
--- /dev/null |
+++ b/chrome/browser/net/packed_ct_ev_whitelist.cc |
@@ -0,0 +1,138 @@ |
+// 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 <string.h> |
+ |
+#include <algorithm> |
+ |
+#include "base/big_endian.h" |
+#include "base/files/file_util.h" |
+#include "base/lazy_instance.h" |
+#include "base/logging.h" |
+#include "chrome/browser/net/bit_stream_reader.h" |
+#include "content/public/browser/browser_thread.h" |
+#include "net/ssl/ssl_config_service.h" |
+ |
+namespace { |
+const uint8_t kCertHashLengthBits = 64; // 8 bytes |
+const uint8_t kCertHashLength = kCertHashLengthBits / 8; |
+const uint64_t kGolombMParameterBits = 47; // 2^47 |
+ |
+void SetNewEVWhitelistInSSLConfigService( |
+ const scoped_refptr<net::ct::EVCertsWhitelist>& new_whitelist) { |
+ net::SSLConfigService::SetEVCertsWhitelist(new_whitelist); |
+} |
+ |
+int TruncatedHashesComparator(const void* v1, const void* v2) { |
+ const uint64_t& h1(*(static_cast<const uint64_t*>(v1))); |
+ const uint64_t& h2(*(static_cast<const uint64_t*>(v2))); |
+ if (h1 < h2) |
+ return -1; |
+ else if (h1 > h2) |
+ return 1; |
+ return 0; |
+} |
+} // namespace |
+ |
+void SetEVWhitelistFromFile(const base::FilePath& compressed_whitelist_file) { |
+ 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::Closure assign_cb = |
+ base::Bind(SetNewEVWhitelistInSSLConfigService, new_whitelist); |
+ content::BrowserThread::PostTask( |
+ content::BrowserThread::IO, FROM_HERE, assign_cb); |
+} |
+ |
+bool PackedEVCertsWhitelist::UncompressEVWhitelist( |
+ const std::string& compressed_whitelist, |
+ std::vector<uint64_t>* uncompressed_list) { |
+ internal::BitStreamReader reader(base::StringPiece( |
+ compressed_whitelist.data(), compressed_whitelist.size())); |
+ std::vector<uint64_t> 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; |
+ } |
+ result.push_back(curr_hash); |
+ // M is the tunable parameter used by the Golomb coding. |
+ static const uint64_t kGolombParameterM = 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; |
+ } |
+ if (read_prefix > (UINT64_MAX / kGolombParameterM)) { |
+ VLOG(1) << "Received value that would cause overflow: " << read_prefix; |
+ return false; |
+ } |
+ |
+ uint64_t r = 0; |
+ if (!reader.ReadBits(kGolombMParameterBits, &r)) { |
+ VLOG(1) << "Failed reading " << kGolombMParameterBits << " bits."; |
+ return false; |
+ } |
+ DCHECK_LT(r, kGolombParameterM); |
+ |
+ uint64_t curr_diff = read_prefix * kGolombParameterM + r; |
+ curr_hash += curr_diff; |
+ |
+ result.push_back(curr_hash); |
+ } |
+ |
+ uncompressed_list->swap(result); |
+ return true; |
+} |
+ |
+PackedEVCertsWhitelist::PackedEVCertsWhitelist( |
+ const std::string& compressed_whitelist) |
+ : is_whitelist_valid_(false) { |
+ if (!UncompressEVWhitelist(compressed_whitelist, &whitelist_)) { |
+ whitelist_.clear(); |
+ return; |
+ } |
+ |
+ is_whitelist_valid_ = true; |
+} |
+ |
+PackedEVCertsWhitelist::~PackedEVCertsWhitelist() { |
+} |
+ |
+bool PackedEVCertsWhitelist::ContainsCertificateHash( |
+ const std::string& certificate_hash) const { |
+ DCHECK(!whitelist_.empty()); |
+ uint64_t hash_to_lookup; |
+ |
+ base::ReadBigEndian(certificate_hash.data(), &hash_to_lookup); |
+ return bsearch(&hash_to_lookup, |
+ &whitelist_[0], |
+ whitelist_.size(), |
+ kCertHashLength, |
+ TruncatedHashesComparator) != NULL; |
+} |
+ |
+bool PackedEVCertsWhitelist::IsValid() const { |
+ return is_whitelist_valid_; |
+} |