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      1 // Copyright (c) 2012 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/chrome_fraudulent_certificate_reporter.h"
      6 
      7 #include <set>
      8 
      9 #include "base/base64.h"
     10 #include "base/logging.h"
     11 #include "base/stl_util.h"
     12 #include "base/time/time.h"
     13 #include "chrome/browser/net/cert_logger.pb.h"
     14 #include "net/base/load_flags.h"
     15 #include "net/base/upload_bytes_element_reader.h"
     16 #include "net/base/upload_data_stream.h"
     17 #include "net/cert/x509_certificate.h"
     18 #include "net/ssl/ssl_info.h"
     19 #include "net/url_request/url_request_context.h"
     20 
     21 namespace chrome_browser_net {
     22 
     23 // TODO(palmer): Switch to HTTPS when the error handling delegate is more
     24 // sophisticated. Ultimately we plan to attempt the report on many transports.
     25 static const char kFraudulentCertificateUploadEndpoint[] =
     26     "http://clients3.google.com/log_cert_error";
     27 
     28 ChromeFraudulentCertificateReporter::ChromeFraudulentCertificateReporter(
     29     net::URLRequestContext* request_context)
     30     : request_context_(request_context),
     31       upload_url_(kFraudulentCertificateUploadEndpoint) {
     32 }
     33 
     34 ChromeFraudulentCertificateReporter::~ChromeFraudulentCertificateReporter() {
     35   STLDeleteElements(&inflight_requests_);
     36 }
     37 
     38 static std::string BuildReport(const std::string& hostname,
     39                                const net::SSLInfo& ssl_info) {
     40   CertLoggerRequest request;
     41   base::Time now = base::Time::Now();
     42   request.set_time_usec(now.ToInternalValue());
     43   request.set_hostname(hostname);
     44 
     45   std::vector<std::string> pem_encoded_chain;
     46   if (!ssl_info.cert->GetPEMEncodedChain(&pem_encoded_chain)) {
     47     LOG(ERROR) << "Could not get PEM encoded chain.";
     48   }
     49   std::string* cert_chain = request.mutable_cert_chain();
     50   for (size_t i = 0; i < pem_encoded_chain.size(); ++i)
     51     *cert_chain += pem_encoded_chain[i];
     52 
     53   std::string out;
     54   request.SerializeToString(&out);
     55   return out;
     56 }
     57 
     58 net::URLRequest* ChromeFraudulentCertificateReporter::CreateURLRequest(
     59       net::URLRequestContext* context) {
     60   net::URLRequest* request = context->CreateRequest(upload_url_, this);
     61   request->set_load_flags(net::LOAD_DO_NOT_SEND_COOKIES |
     62                           net::LOAD_DO_NOT_SAVE_COOKIES);
     63   return request;
     64 }
     65 
     66 void ChromeFraudulentCertificateReporter::SendReport(
     67     const std::string& hostname,
     68     const net::SSLInfo& ssl_info,
     69     bool sni_available) {
     70   // We do silent/automatic reporting ONLY for Google properties. For other
     71   // domains (when we start supporting that), we will ask for user permission.
     72   if (!net::TransportSecurityState::IsGooglePinnedProperty(hostname,
     73                                                            sni_available)) {
     74     return;
     75   }
     76 
     77   std::string report = BuildReport(hostname, ssl_info);
     78 
     79   net::URLRequest* url_request = CreateURLRequest(request_context_);
     80   url_request->set_method("POST");
     81 
     82   scoped_ptr<net::UploadElementReader> reader(
     83       net::UploadOwnedBytesElementReader::CreateWithString(report));
     84   url_request->set_upload(make_scoped_ptr(
     85       net::UploadDataStream::CreateWithReader(reader.Pass(), 0)));
     86 
     87   net::HttpRequestHeaders headers;
     88   headers.SetHeader(net::HttpRequestHeaders::kContentType,
     89                     "x-application/chrome-fraudulent-cert-report");
     90   url_request->SetExtraRequestHeaders(headers);
     91 
     92   inflight_requests_.insert(url_request);
     93   url_request->Start();
     94 }
     95 
     96 void ChromeFraudulentCertificateReporter::RequestComplete(
     97     net::URLRequest* request) {
     98   std::set<net::URLRequest*>::iterator i = inflight_requests_.find(request);
     99   DCHECK(i != inflight_requests_.end());
    100   delete *i;
    101   inflight_requests_.erase(i);
    102 }
    103 
    104 // TODO(palmer): Currently, the upload is fire-and-forget but soon we will
    105 // try to recover by retrying, and trying different endpoints, and
    106 // appealing to the user.
    107 void ChromeFraudulentCertificateReporter::OnResponseStarted(
    108     net::URLRequest* request) {
    109   const net::URLRequestStatus& status(request->status());
    110   if (!status.is_success()) {
    111     LOG(WARNING) << "Certificate upload failed"
    112                  << " status:" << status.status()
    113                  << " error:" << status.error();
    114   } else if (request->GetResponseCode() != 200) {
    115     LOG(WARNING) << "Certificate upload HTTP status: "
    116                  << request->GetResponseCode();
    117   }
    118   RequestComplete(request);
    119 }
    120 
    121 void ChromeFraudulentCertificateReporter::OnReadCompleted(
    122     net::URLRequest* request, int bytes_read) {}
    123 
    124 }  // namespace chrome_browser_net
    125