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1 // Copyright 2015 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 "components/certificate_transparency/log_proof_fetcher.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/stl_util.h" | |
9 #include "base/strings/string_piece.h" | |
10 #include "base/values.h" | |
11 #include "components/certificate_transparency/log_response_parser.h" | |
12 #include "components/safe_json_parser/safe_json_parser.h" | |
13 #include "net/base/load_flags.h" | |
14 #include "net/base/request_priority.h" | |
15 #include "net/cert/ct_log_verifier.h" | |
16 #include "net/cert/signed_tree_head.h" | |
17 #include "net/url_request/url_request_context.h" | |
18 | |
19 const int kMaxSTHSizeInBytes = 600; | |
20 | |
21 namespace certificate_transparency { | |
22 | |
23 struct LogProofFetcher::FetchParams { | |
24 explicit FetchParams(const std::string& id, FetchSTHCallback callback); | |
25 ~FetchParams(); | |
26 | |
27 std::string log_id; | |
28 FetchSTHCallback fetched_callback; | |
29 scoped_refptr<net::IOBufferWithSize> sth_buffer; | |
30 int read_bytes; | |
31 }; | |
32 | |
33 LogProofFetcher::LogProofFetcher(net::URLRequestContext* request_context) | |
34 : request_context_(request_context), weak_factory_(this) { | |
35 DCHECK(request_context); | |
36 } | |
37 | |
38 LogProofFetcher::~LogProofFetcher() { | |
39 for (auto it = inflight_requests_.begin(); it != inflight_requests_.end(); | |
Ryan Sleevi
2015/06/29 11:58:13
const auto& ||
for (inflight_request : inflight_r
| |
40 ++it) | |
41 it->first->Cancel(); | |
42 STLDeleteContainerPairPointers(inflight_requests_.begin(), | |
43 inflight_requests_.end()); | |
44 } | |
45 | |
46 scoped_ptr<net::URLRequest> LogProofFetcher::CreateURLRequest( | |
47 const GURL& fetch_sth_url) { | |
48 DCHECK(request_context_); | |
49 | |
50 scoped_ptr<net::URLRequest> request = request_context_->CreateRequest( | |
51 fetch_sth_url, net::DEFAULT_PRIORITY, this); | |
52 request->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES | | |
Ryan Sleevi
2015/06/29 11:58:13
TBD: Whether or not we should send AUTH_DATA or an
| |
53 net::LOAD_DO_NOT_SAVE_COOKIES); | |
54 return request.Pass(); | |
55 } | |
56 | |
57 void LogProofFetcher::FetchSTH(const GURL& log_url, | |
58 const std::string& log_id, | |
59 FetchSTHCallback fetched_cb) { | |
60 GURL fetch_url(log_url.Resolve("ct/v1/get-sth")); | |
61 VLOG(1) << "About to fetch STH from " << fetch_url; | |
62 scoped_ptr<net::URLRequest> request = CreateURLRequest(fetch_url); | |
63 | |
64 request->set_method("GET"); | |
65 | |
66 net::URLRequest* raw_request = request.get(); | |
67 FetchParams* params = new FetchParams(log_id, fetched_cb); | |
68 inflight_requests_.insert(std::make_pair(request.release(), params)); | |
69 raw_request->Start(); | |
70 } | |
71 | |
72 void LogProofFetcher::OnResponseStarted(net::URLRequest* request) { | |
73 const net::URLRequestStatus& status(request->status()); | |
74 VLOG(1) << "Response started for fetch-sth from " << request->original_url(); | |
75 if (!status.is_success()) { | |
76 LOG(WARNING) << "Fetching STH from " << request->original_url() | |
77 << " failed. status:" << status.status() | |
78 << " error:" << status.error(); | |
79 CleanupRequest(request); | |
80 } else if (request->GetResponseCode() != 200) { | |
81 LOG(WARNING) << "Fetch STH HTTP status: " << request->GetResponseCode(); | |
82 CleanupRequest(request); | |
83 return; | |
84 } | |
85 | |
86 auto it(inflight_requests_.find(request)); | |
87 DCHECK(it != inflight_requests_.end()); | |
88 scoped_refptr<net::IOBufferWithSize> buffer(it->second->sth_buffer); | |
89 VLOG(1) << "Kicking off read."; | |
90 request->Read(buffer.get(), buffer->size(), &(it->second->read_bytes)); | |
91 if (request->status().is_io_pending()) { | |
92 VLOG(1) << "IO Pending: Will wait."; | |
93 return; | |
94 } else { | |
95 VLOG(1) << "Data available: Invoking OnReadComplete."; | |
96 OnReadCompleted(request, it->second->read_bytes); | |
97 } | |
98 } | |
99 | |
100 void LogProofFetcher::OnReadCompleted(net::URLRequest* request, | |
101 int bytes_read) { | |
102 VLOG(1) << "Read complete, got " << bytes_read << " bytes."; | |
103 RequestComplete(request, bytes_read); | |
104 } | |
105 | |
106 void LogProofFetcher::RequestComplete(net::URLRequest* request, | |
107 int bytes_read) { | |
108 auto it(inflight_requests_.find(request)); | |
109 DCHECK(it != inflight_requests_.end()); | |
110 if (it->first != request) { | |
111 NOTREACHED(); | |
112 return; | |
113 } | |
114 | |
115 FetchParams* params(it->second); | |
116 VLOG(1) << "Got " << bytes_read << " bytes."; | |
117 | |
118 // Extract STH json an parse it | |
119 std::string json_sth(params->sth_buffer->data(), bytes_read); | |
120 VLOG(1) << "STH data: " << json_sth; | |
121 | |
122 FetchParams request_params(*params); | |
123 // Get rid of the buffer as it really isn't necessary. | |
124 request_params.sth_buffer = nullptr; | |
125 scoped_refptr<safe_json_parser::SafeJsonParser> parser = | |
Ryan Sleevi
2015/06/29 11:58:13
nit: s/parser = /parser(/
| |
126 new safe_json_parser::SafeJsonParser( | |
127 json_sth, | |
128 base::Bind(&LogProofFetcher::OnSTHJsonParseSuccess, | |
129 weak_factory_.GetWeakPtr(), | |
130 request_params), | |
131 base::Bind(&LogProofFetcher::OnSTHJsonParseError, | |
132 weak_factory_.GetWeakPtr(), | |
133 request_params)); | |
134 // The parser will call us back via one of the callbacks. | |
135 parser->Start(); | |
136 | |
137 CleanupRequest(request); | |
138 } | |
139 | |
140 void LogProofFetcher::CleanupRequest(net::URLRequest* request) { | |
141 VLOG(1) << "Cleaning up request to " << request->original_url(); | |
142 auto it(inflight_requests_.find(request)); | |
143 DCHECK(it != inflight_requests_.end()); | |
144 | |
145 scoped_ptr<FetchParams> params(it->second); | |
146 // Delete the request, remove from map. | |
147 scoped_ptr<net::URLRequest> url_request(it->first); | |
148 // Both pointers will be deleted when exiting the method. | |
149 VLOG(1) << "Erasing iterator."; | |
150 inflight_requests_.erase(it); | |
151 } | |
152 | |
153 | |
154 void LogProofFetcher::OnSTHJsonParseSuccess( | |
155 FetchParams params, | |
156 scoped_ptr<base::Value> parsed_json) { | |
157 VLOG(1) << "Successfully parsed STH JSON."; | |
158 net::ct::SignedTreeHead sth; | |
159 if (!CTLogResponseParser::FillSignedTreeHead(parsed_json.Pass(), &sth)) { | |
160 LOG(ERROR) << "Invalid STH."; | |
161 return; | |
162 } | |
163 | |
164 VLOG(1) << "Parsed STH successfully."; | |
165 params.fetched_callback.Run(params.log_id, sth); | |
166 VLOG(1) << "Invoked callback."; | |
167 } | |
168 | |
169 void LogProofFetcher::OnSTHJsonParseError( | |
170 FetchParams params, | |
171 const std::string& error) { | |
172 VLOG(1) << "Parsing of STH JSON failed."; | |
173 } | |
174 | |
175 LogProofFetcher::FetchParams::FetchParams(const std::string& id, | |
176 FetchSTHCallback callback) | |
177 : log_id(id), | |
178 fetched_callback(callback), | |
179 sth_buffer(new net::IOBufferWithSize(kMaxSTHSizeInBytes)) { | |
180 } | |
181 | |
182 LogProofFetcher::FetchParams::~FetchParams() { | |
183 } | |
184 | |
185 } // namespace certificate_transparency | |
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