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 "content/browser/ssl/ssl_policy.h"
6
7#include "base/base_switches.h"
8#include "base/bind.h"
9#include "base/command_line.h"
10#include "base/memory/singleton.h"
11#include "base/strings/string_piece.h"
12#include "base/strings/string_util.h"
13#include "content/browser/frame_host/navigation_entry_impl.h"
14#include "content/browser/renderer_host/render_process_host_impl.h"
15#include "content/browser/renderer_host/render_view_host_impl.h"
16#include "content/browser/site_instance_impl.h"
17#include "content/browser/ssl/ssl_cert_error_handler.h"
18#include "content/browser/ssl/ssl_request_info.h"
19#include "content/browser/web_contents/web_contents_impl.h"
20#include "content/public/browser/content_browser_client.h"
21#include "content/public/common/ssl_status.h"
22#include "content/public/common/url_constants.h"
23#include "net/ssl/ssl_info.h"
24#include "webkit/common/resource_type.h"
25
26
27namespace content {
28
29SSLPolicy::SSLPolicy(SSLPolicyBackend* backend)
30    : backend_(backend) {
31  DCHECK(backend_);
32}
33
34void SSLPolicy::OnCertError(SSLCertErrorHandler* handler) {
35  // First we check if we know the policy for this error.
36  net::CertPolicy::Judgment judgment = backend_->QueryPolicy(
37      handler->ssl_info().cert.get(),
38      handler->request_url().host(),
39      handler->cert_error());
40
41  if (judgment == net::CertPolicy::ALLOWED) {
42    handler->ContinueRequest();
43    return;
44  }
45
46  // The judgment is either DENIED or UNKNOWN.
47  // For now we handle the DENIED as the UNKNOWN, which means a blocking
48  // page is shown to the user every time he comes back to the page.
49
50  switch (handler->cert_error()) {
51    case net::ERR_CERT_COMMON_NAME_INVALID:
52    case net::ERR_CERT_DATE_INVALID:
53    case net::ERR_CERT_AUTHORITY_INVALID:
54    case net::ERR_CERT_WEAK_SIGNATURE_ALGORITHM:
55    case net::ERR_CERT_WEAK_KEY:
56    case net::ERR_CERT_NAME_CONSTRAINT_VIOLATION:
57      OnCertErrorInternal(handler, !handler->fatal(), handler->fatal());
58      break;
59    case net::ERR_CERT_NO_REVOCATION_MECHANISM:
60      // Ignore this error.
61      handler->ContinueRequest();
62      break;
63    case net::ERR_CERT_UNABLE_TO_CHECK_REVOCATION:
64      // We ignore this error but will show a warning status in the location
65      // bar.
66      handler->ContinueRequest();
67      break;
68    case net::ERR_CERT_CONTAINS_ERRORS:
69    case net::ERR_CERT_REVOKED:
70    case net::ERR_CERT_INVALID:
71    case net::ERR_SSL_WEAK_SERVER_EPHEMERAL_DH_KEY:
72    case net::ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN:
73      OnCertErrorInternal(handler, false, handler->fatal());
74      break;
75    default:
76      NOTREACHED();
77      handler->CancelRequest();
78      break;
79  }
80}
81
82void SSLPolicy::DidRunInsecureContent(NavigationEntryImpl* entry,
83                                      const std::string& security_origin) {
84  if (!entry)
85    return;
86
87  SiteInstance* site_instance = entry->site_instance();
88  if (!site_instance)
89      return;
90
91  backend_->HostRanInsecureContent(GURL(security_origin).host(),
92                                   site_instance->GetProcess()->GetID());
93}
94
95void SSLPolicy::OnRequestStarted(SSLRequestInfo* info) {
96  // TODO(abarth): This mechanism is wrong.  What we should be doing is sending
97  // this information back through WebKit and out some FrameLoaderClient
98  // methods.
99
100  if (net::IsCertStatusError(info->ssl_cert_status()))
101    backend_->HostRanInsecureContent(info->url().host(), info->child_id());
102}
103
104void SSLPolicy::UpdateEntry(NavigationEntryImpl* entry,
105                            WebContentsImpl* web_contents) {
106  DCHECK(entry);
107
108  InitializeEntryIfNeeded(entry);
109
110  if (!entry->GetURL().SchemeIsSecure())
111    return;
112
113  // An HTTPS response may not have a certificate for some reason.  When that
114  // happens, use the unauthenticated (HTTP) rather than the authentication
115  // broken security style so that we can detect this error condition.
116  if (!entry->GetSSL().cert_id) {
117    entry->GetSSL().security_style = SECURITY_STYLE_UNAUTHENTICATED;
118    return;
119  }
120
121  if (net::IsCertStatusError(entry->GetSSL().cert_status)) {
122    // Minor errors don't lower the security style to
123    // SECURITY_STYLE_AUTHENTICATION_BROKEN.
124    if (!net::IsCertStatusMinorError(entry->GetSSL().cert_status)) {
125      entry->GetSSL().security_style =
126          SECURITY_STYLE_AUTHENTICATION_BROKEN;
127    }
128    return;
129  }
130
131  SiteInstance* site_instance = entry->site_instance();
132  // Note that |site_instance| can be NULL here because NavigationEntries don't
133  // necessarily have site instances.  Without a process, the entry can't
134  // possibly have insecure content.  See bug http://crbug.com/12423.
135  if (site_instance &&
136      backend_->DidHostRunInsecureContent(
137          entry->GetURL().host(), site_instance->GetProcess()->GetID())) {
138    entry->GetSSL().security_style =
139        SECURITY_STYLE_AUTHENTICATION_BROKEN;
140    entry->GetSSL().content_status |= SSLStatus::RAN_INSECURE_CONTENT;
141    return;
142  }
143
144  if (web_contents->DisplayedInsecureContent())
145    entry->GetSSL().content_status |= SSLStatus::DISPLAYED_INSECURE_CONTENT;
146  else
147    entry->GetSSL().content_status &= ~SSLStatus::DISPLAYED_INSECURE_CONTENT;
148}
149
150void SSLPolicy::OnAllowCertificate(scoped_refptr<SSLCertErrorHandler> handler,
151                                   bool allow) {
152  if (allow) {
153    // Default behavior for accepting a certificate.
154    // Note that we should not call SetMaxSecurityStyle here, because the active
155    // NavigationEntry has just been deleted (in HideInterstitialPage) and the
156    // new NavigationEntry will not be set until DidNavigate.  This is ok,
157    // because the new NavigationEntry will have its max security style set
158    // within DidNavigate.
159    //
160    // While AllowCertForHost() executes synchronously on this thread,
161    // ContinueRequest() gets posted to a different thread. Calling
162    // AllowCertForHost() first ensures deterministic ordering.
163    backend_->AllowCertForHost(handler->ssl_info().cert.get(),
164                               handler->request_url().host(),
165                               handler->cert_error());
166    handler->ContinueRequest();
167  } else {
168    // Default behavior for rejecting a certificate.
169    //
170    // While DenyCertForHost() executes synchronously on this thread,
171    // CancelRequest() gets posted to a different thread. Calling
172    // DenyCertForHost() first ensures deterministic ordering.
173    backend_->DenyCertForHost(handler->ssl_info().cert.get(),
174                              handler->request_url().host(),
175                              handler->cert_error());
176    handler->CancelRequest();
177  }
178}
179
180////////////////////////////////////////////////////////////////////////////////
181// Certificate Error Routines
182
183void SSLPolicy::OnCertErrorInternal(SSLCertErrorHandler* handler,
184                                    bool overridable,
185                                    bool strict_enforcement) {
186  CertificateRequestResultType result =
187      CERTIFICATE_REQUEST_RESULT_TYPE_CONTINUE;
188  GetContentClient()->browser()->AllowCertificateError(
189      handler->render_process_id(),
190      handler->render_view_id(),
191      handler->cert_error(),
192      handler->ssl_info(),
193      handler->request_url(),
194      handler->resource_type(),
195      overridable,
196      strict_enforcement,
197      base::Bind(&SSLPolicy::OnAllowCertificate, base::Unretained(this),
198                 make_scoped_refptr(handler)),
199      &result);
200  switch (result) {
201    case CERTIFICATE_REQUEST_RESULT_TYPE_CONTINUE:
202      break;
203    case CERTIFICATE_REQUEST_RESULT_TYPE_CANCEL:
204      handler->CancelRequest();
205      break;
206    case CERTIFICATE_REQUEST_RESULT_TYPE_DENY:
207      handler->DenyRequest();
208      break;
209    default:
210      NOTREACHED();
211  }
212}
213
214void SSLPolicy::InitializeEntryIfNeeded(NavigationEntryImpl* entry) {
215  if (entry->GetSSL().security_style != SECURITY_STYLE_UNKNOWN)
216    return;
217
218  entry->GetSSL().security_style = entry->GetURL().SchemeIsSecure() ?
219      SECURITY_STYLE_AUTHENTICATED : SECURITY_STYLE_UNAUTHENTICATED;
220}
221
222void SSLPolicy::OriginRanInsecureContent(const std::string& origin, int pid) {
223  GURL parsed_origin(origin);
224  if (parsed_origin.SchemeIsSecure())
225    backend_->HostRanInsecureContent(parsed_origin.host(), pid);
226}
227
228}  // namespace content
229