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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "chrome/browser/net/packed_ct_ev_whitelist.h" | |
6 | |
7 #include <string.h> | |
8 | |
9 #include <algorithm> | |
10 | |
11 #include "base/big_endian.h" | |
12 #include "base/files/file_util.h" | |
13 #include "base/lazy_instance.h" | |
14 #include "base/logging.h" | |
15 #include "chrome/browser/net/bit_stream_reader.h" | |
16 #include "content/public/browser/browser_thread.h" | |
17 #include "net/ssl/ssl_config_service.h" | |
18 | |
19 namespace { | |
20 const uint8_t kCertHashLengthBits = 64; // 8 bytes | |
21 const uint64_t kGolombMParameterBits = 47; // 2^47 | |
22 | |
23 void SetNewEVWhitelistInSSLConfigService( | |
24 const scoped_refptr<net::ct::EVCertsWhitelist>& new_whitelist) { | |
25 net::SSLConfigService::SetEVCertsWhitelist(new_whitelist); | |
26 } | |
27 | |
28 } // namespace | |
29 | |
30 void SetEVWhitelistFromFile(const base::FilePath& compressed_whitelist_file) { | |
31 VLOG(1) << "Setting EV whitelist from file: " | |
32 << compressed_whitelist_file.value(); | |
33 std::string compressed_list; | |
34 if (!base::ReadFileToString(compressed_whitelist_file, &compressed_list)) { | |
35 VLOG(1) << "Failed reading from " << compressed_whitelist_file.value(); | |
36 return; | |
37 } | |
38 | |
39 scoped_refptr<net::ct::EVCertsWhitelist> new_whitelist( | |
40 new PackedEVCertsWhitelist(compressed_list)); | |
41 if (!new_whitelist->IsValid()) { | |
42 VLOG(1) << "Failed uncompressing EV certs whitelist."; | |
43 return; | |
44 } | |
45 | |
46 base::Callback<void(void)> assign_cb = | |
47 base::Bind(SetNewEVWhitelistInSSLConfigService, new_whitelist); | |
48 content::BrowserThread::PostTask( | |
49 content::BrowserThread::IO, FROM_HERE, assign_cb); | |
50 } | |
51 | |
52 bool PackedEVCertsWhitelist::UncompressEVWhitelist( | |
53 const std::string& compressed_whitelist, | |
54 std::vector<std::string>* uncompressed_list) { | |
55 internal::BitStreamReader reader(base::StringPiece( | |
56 compressed_whitelist.data(), compressed_whitelist.size())); | |
57 std::vector<std::string> result; | |
58 | |
59 VLOG(1) << "Uncompressing EV whitelist of size " | |
60 << compressed_whitelist.size(); | |
61 uint64_t curr_hash(0); | |
62 if (!reader.ReadBits(kCertHashLengthBits, &curr_hash)) { | |
63 VLOG(1) << "Failed reading first hash."; | |
64 return false; | |
65 } | |
66 char hash_bytes[8]; | |
67 base::WriteBigEndian(hash_bytes, curr_hash); | |
68 result.push_back(std::string(hash_bytes, 8)); | |
69 // M is the tunable parameter used by the Golomb coding. | |
70 static const uint64_t M = static_cast<uint64_t>(1) << kGolombMParameterBits; | |
71 | |
72 while (reader.BitsLeft() > kGolombMParameterBits) { | |
73 uint64_t read_prefix = 0; | |
74 if (!reader.ReadUnaryEncoding(&read_prefix)) { | |
75 VLOG(1) << "Failed reading unary-encoded prefix."; | |
76 return false; | |
77 } | |
78 if (read_prefix > (UINT64_MAX / M)) { | |
79 VLOG(1) << "Received value that would cause overflow: " << read_prefix; | |
80 return false; | |
81 } | |
82 | |
83 uint64_t r = 0; | |
84 if (!reader.ReadBits(kGolombMParameterBits, &r)) { | |
85 VLOG(1) << "Failed reading " << kGolombMParameterBits << " bits."; | |
86 return false; | |
87 } | |
88 DCHECK_LT(r, M); | |
89 | |
90 uint64_t curr_diff = read_prefix * M + r; | |
91 curr_hash += curr_diff; | |
92 | |
93 base::WriteBigEndian(hash_bytes, curr_hash); | |
94 result.push_back(std::string(hash_bytes, 8)); | |
Ryan Sleevi
2014/10/22 19:26:58
This 8 is duplicated on lines 68 and 66. Perhaps t
Eran Messeri
2014/10/22 23:32:03
Done.
| |
95 } | |
96 | |
97 uncompressed_list->swap(result); | |
98 return true; | |
99 } | |
100 | |
101 PackedEVCertsWhitelist::PackedEVCertsWhitelist( | |
102 const std::string& compressed_whitelist) | |
103 : is_whitelist_valid_(false) { | |
104 if (!UncompressEVWhitelist(compressed_whitelist, &whitelist_)) { | |
105 whitelist_.clear(); | |
106 return; | |
107 } | |
108 | |
109 is_whitelist_valid_ = true; | |
110 } | |
111 | |
112 PackedEVCertsWhitelist::~PackedEVCertsWhitelist() { | |
113 } | |
114 | |
115 bool PackedEVCertsWhitelist::ContainsCertificateHash( | |
116 const std::string& certificate_hash) const { | |
117 DCHECK(!whitelist_.empty()); | |
118 return std::binary_search( | |
119 whitelist_.begin(), whitelist_.end(), certificate_hash); | |
120 } | |
121 | |
122 bool PackedEVCertsWhitelist::IsValid() const { | |
123 return is_whitelist_valid_; | |
124 } | |
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