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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 uint8_t kCertHashLength = kCertHashLengthBits / 8; | |
22 const uint64_t kGolombMParameterBits = 47; // 2^47 | |
23 | |
24 void SetNewEVWhitelistInSSLConfigService( | |
25 const scoped_refptr<net::ct::EVCertsWhitelist>& new_whitelist) { | |
26 net::SSLConfigService::SetEVCertsWhitelist(new_whitelist); | |
27 } | |
28 | |
29 int TruncatedHashesComparator(const void* v1, const void* v2) { | |
30 return *(static_cast<const uint64_t*>(v1)) < | |
31 *(static_cast<const uint64_t*>(v2)); | |
32 } | |
33 } // namespace | |
34 | |
35 void SetEVWhitelistFromFile(const base::FilePath& compressed_whitelist_file) { | |
36 VLOG(1) << "Setting EV whitelist from file: " | |
37 << compressed_whitelist_file.value(); | |
38 std::string compressed_list; | |
39 if (!base::ReadFileToString(compressed_whitelist_file, &compressed_list)) { | |
40 VLOG(1) << "Failed reading from " << compressed_whitelist_file.value(); | |
41 return; | |
42 } | |
43 | |
44 scoped_refptr<net::ct::EVCertsWhitelist> new_whitelist( | |
45 new PackedEVCertsWhitelist(compressed_list)); | |
46 if (!new_whitelist->IsValid()) { | |
47 VLOG(1) << "Failed uncompressing EV certs whitelist."; | |
48 return; | |
49 } | |
50 | |
51 base::Callback<void(void)> assign_cb = | |
Ryan Sleevi
2014/10/27 17:09:48
you can use base::Closure, but that's no big deal.
Eran Messeri
2014/10/28 11:43:58
Done.
| |
52 base::Bind(SetNewEVWhitelistInSSLConfigService, new_whitelist); | |
53 content::BrowserThread::PostTask( | |
54 content::BrowserThread::IO, FROM_HERE, assign_cb); | |
55 } | |
56 | |
57 bool PackedEVCertsWhitelist::UncompressEVWhitelist( | |
58 const std::string& compressed_whitelist, | |
59 std::vector<std::string>* uncompressed_list) { | |
60 internal::BitStreamReader reader(base::StringPiece( | |
61 compressed_whitelist.data(), compressed_whitelist.size())); | |
62 std::vector<std::string> result; | |
63 | |
64 VLOG(1) << "Uncompressing EV whitelist of size " | |
65 << compressed_whitelist.size(); | |
66 uint64_t curr_hash(0); | |
67 if (!reader.ReadBits(kCertHashLengthBits, &curr_hash)) { | |
68 VLOG(1) << "Failed reading first hash."; | |
69 return false; | |
70 } | |
71 char hash_bytes[kCertHashLength]; | |
72 base::WriteBigEndian(hash_bytes, curr_hash); | |
73 result.push_back(std::string(hash_bytes, kCertHashLength)); | |
74 // M is the tunable parameter used by the Golomb coding. | |
75 static const uint64_t kGolombParameterM = static_cast<uint64_t>(1) | |
76 << kGolombMParameterBits; | |
77 | |
78 while (reader.BitsLeft() > kGolombMParameterBits) { | |
79 uint64_t read_prefix = 0; | |
80 if (!reader.ReadUnaryEncoding(&read_prefix)) { | |
81 VLOG(1) << "Failed reading unary-encoded prefix."; | |
82 return false; | |
83 } | |
84 if (read_prefix > (UINT64_MAX / kGolombParameterM)) { | |
85 VLOG(1) << "Received value that would cause overflow: " << read_prefix; | |
86 return false; | |
87 } | |
88 | |
89 uint64_t r = 0; | |
90 if (!reader.ReadBits(kGolombMParameterBits, &r)) { | |
91 VLOG(1) << "Failed reading " << kGolombMParameterBits << " bits."; | |
92 return false; | |
93 } | |
94 DCHECK_LT(r, kGolombParameterM); | |
95 | |
96 uint64_t curr_diff = read_prefix * kGolombParameterM + r; | |
97 curr_hash += curr_diff; | |
98 | |
99 base::WriteBigEndian(hash_bytes, curr_hash); | |
100 result.push_back(std::string(hash_bytes, kCertHashLength)); | |
Ryan Sleevi
2014/10/27 17:09:48
Why convert to an std::string, when you have it as
Eran Messeri
2014/10/28 11:43:58
No reason - changed.
| |
101 } | |
102 | |
103 uncompressed_list->swap(result); | |
104 return true; | |
105 } | |
106 | |
107 PackedEVCertsWhitelist::PackedEVCertsWhitelist( | |
108 const std::string& compressed_whitelist) | |
109 : is_whitelist_valid_(false) { | |
110 std::vector<std::string> new_whitelist; | |
111 if (!UncompressEVWhitelist(compressed_whitelist, &new_whitelist)) { | |
112 whitelist_.clear(); | |
113 return; | |
114 } | |
115 | |
116 whitelist_.resize(new_whitelist.size()); | |
117 for (size_t i = 0; i < new_whitelist.size(); ++i) { | |
118 base::ReadBigEndian(new_whitelist[i].data(), &(whitelist_[i])); | |
119 } | |
120 | |
121 is_whitelist_valid_ = true; | |
122 } | |
123 | |
124 PackedEVCertsWhitelist::~PackedEVCertsWhitelist() { | |
125 } | |
126 | |
127 bool PackedEVCertsWhitelist::ContainsCertificateHash( | |
128 const std::string& certificate_hash) const { | |
129 DCHECK(!whitelist_.empty()); | |
130 return bsearch(certificate_hash.c_str(), | |
Ryan Sleevi
2014/10/27 17:09:48
Isn't this where you should be ensuring big endian
Eran Messeri
2014/10/28 11:43:58
Good catch, done.
| |
131 &whitelist_[0], | |
132 whitelist_.size(), | |
133 kCertHashLength, | |
134 TruncatedHashesComparator) != NULL; | |
135 } | |
136 | |
137 bool PackedEVCertsWhitelist::IsValid() const { | |
138 return is_whitelist_valid_; | |
139 } | |
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