- add sources.
[platform/framework/web/crosswalk.git] / src / content / browser / cert_store_impl.cc
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/cert_store_impl.h"
6
7 #include <algorithm>
8 #include <functional>
9
10 #include "base/bind.h"
11 #include "base/stl_util.h"
12 #include "content/browser/renderer_host/render_process_host_impl.h"
13 #include "content/browser/renderer_host/render_view_host_impl.h"
14 #include "content/public/browser/browser_thread.h"
15 #include "content/public/browser/notification_service.h"
16 #include "content/public/browser/notification_types.h"
17
18 template <typename T>
19 struct MatchSecond {
20   explicit MatchSecond(const T& t) : value(t) {}
21
22   template<typename Pair>
23   bool operator()(const Pair& p) const {
24     return (value == p.second);
25   }
26   T value;
27 };
28
29 namespace content {
30
31 // static
32 CertStore* CertStore::GetInstance() {
33   return CertStoreImpl::GetInstance();
34 }
35
36 //  static
37 CertStoreImpl* CertStoreImpl::GetInstance() {
38   return Singleton<CertStoreImpl>::get();
39 }
40
41 CertStoreImpl::CertStoreImpl() : next_cert_id_(1) {
42   if (BrowserThread::CurrentlyOn(BrowserThread::UI)) {
43     RegisterForNotification();
44   } else {
45     BrowserThread::PostTask(
46         BrowserThread::UI, FROM_HERE,
47         base::Bind(&CertStoreImpl::RegisterForNotification,
48                    base::Unretained(this)));
49   }
50 }
51
52 CertStoreImpl::~CertStoreImpl() {
53 }
54
55 void CertStoreImpl::RegisterForNotification() {
56   // We watch for RenderProcess termination, as this is how we clear
57   // certificates for now.
58   // TODO(jcampan): we should be listening to events such as resource cached/
59   //                removed from cache, and remove the cert when we know it
60   //                is not used anymore.
61
62   registrar_.Add(this, NOTIFICATION_RENDERER_PROCESS_TERMINATED,
63                  NotificationService::AllBrowserContextsAndSources());
64   registrar_.Add(this, NOTIFICATION_RENDERER_PROCESS_CLOSED,
65                  NotificationService::AllBrowserContextsAndSources());
66 }
67
68 int CertStoreImpl::StoreCert(net::X509Certificate* cert, int process_id) {
69   DCHECK(cert);
70   base::AutoLock auto_lock(cert_lock_);
71
72   int cert_id;
73
74   // Do we already know this cert?
75   ReverseCertMap::iterator cert_iter = cert_to_id_.find(cert);
76   if (cert_iter == cert_to_id_.end()) {
77     cert_id = next_cert_id_++;
78     // We use 0 as an invalid cert_id value.  In the unlikely event that
79     // next_cert_id_ wraps around, we reset it to 1.
80     if (next_cert_id_ == 0)
81       next_cert_id_ = 1;
82     cert->AddRef();
83     id_to_cert_[cert_id] = cert;
84     cert_to_id_[cert] = cert_id;
85   } else {
86     cert_id = cert_iter->second;
87   }
88
89   // Let's update process_id_to_cert_id_.
90   std::pair<IDMap::iterator, IDMap::iterator> process_ids =
91       process_id_to_cert_id_.equal_range(process_id);
92   if (std::find_if(process_ids.first, process_ids.second,
93                    MatchSecond<int>(cert_id)) == process_ids.second) {
94     process_id_to_cert_id_.insert(std::make_pair(process_id, cert_id));
95   }
96
97   // And cert_id_to_process_id_.
98   std::pair<IDMap::iterator, IDMap::iterator> cert_ids =
99       cert_id_to_process_id_.equal_range(cert_id);
100   if (std::find_if(cert_ids.first, cert_ids.second,
101                    MatchSecond<int>(process_id)) == cert_ids.second) {
102     cert_id_to_process_id_.insert(std::make_pair(cert_id, process_id));
103   }
104
105   return cert_id;
106 }
107
108 bool CertStoreImpl::RetrieveCert(int cert_id,
109                                  scoped_refptr<net::X509Certificate>* cert) {
110   base::AutoLock auto_lock(cert_lock_);
111
112   CertMap::iterator iter = id_to_cert_.find(cert_id);
113   if (iter == id_to_cert_.end())
114     return false;
115   if (cert)
116     *cert = iter->second;
117   return true;
118 }
119
120 void CertStoreImpl::RemoveCertInternal(int cert_id) {
121   CertMap::iterator cert_iter = id_to_cert_.find(cert_id);
122   DCHECK(cert_iter != id_to_cert_.end());
123
124   ReverseCertMap::iterator id_iter = cert_to_id_.find(cert_iter->second.get());
125   DCHECK(id_iter != cert_to_id_.end());
126   cert_to_id_.erase(id_iter);
127
128   cert_iter->second->Release();
129   id_to_cert_.erase(cert_iter);
130 }
131
132 void CertStoreImpl::RemoveCertsForRenderProcesHost(int process_id) {
133   base::AutoLock auto_lock(cert_lock_);
134
135   // We iterate through all the cert ids for that process.
136   std::pair<IDMap::iterator, IDMap::iterator> process_ids =
137       process_id_to_cert_id_.equal_range(process_id);
138   for (IDMap::iterator ids_iter = process_ids.first;
139        ids_iter != process_ids.second; ++ids_iter) {
140     int cert_id = ids_iter->second;
141     // Find all the processes referring to this cert id in
142     // cert_id_to_process_id_, then locate the process being removed within
143     // that range.
144     std::pair<IDMap::iterator, IDMap::iterator> cert_ids =
145         cert_id_to_process_id_.equal_range(cert_id);
146     IDMap::iterator proc_iter =
147         std::find_if(cert_ids.first, cert_ids.second,
148                      MatchSecond<int>(process_id));
149     DCHECK(proc_iter != cert_ids.second);
150
151     // Before removing, determine if no other processes refer to the current
152     // cert id. If |proc_iter| (the current process) is the lower bound of
153     // processes containing the current cert id and if |next_proc_iter| is the
154     // upper bound (the first process that does not), then only one process,
155     // the one being removed, refers to the cert id.
156     IDMap::iterator next_proc_iter = proc_iter;
157     ++next_proc_iter;
158     bool last_process_for_cert_id =
159         (proc_iter == cert_ids.first && next_proc_iter == cert_ids.second);
160     cert_id_to_process_id_.erase(proc_iter);
161
162     if (last_process_for_cert_id) {
163       // The current cert id is not referenced by any other processes, so
164       // remove it from id_to_cert_ and cert_to_id_.
165       RemoveCertInternal(cert_id);
166     }
167   }
168   if (process_ids.first != process_ids.second)
169     process_id_to_cert_id_.erase(process_ids.first, process_ids.second);
170 }
171
172 void CertStoreImpl::Observe(int type,
173                             const NotificationSource& source,
174                             const NotificationDetails& details) {
175   DCHECK(type == NOTIFICATION_RENDERER_PROCESS_TERMINATED ||
176          type == NOTIFICATION_RENDERER_PROCESS_CLOSED);
177   RenderProcessHost* rph = Source<RenderProcessHost>(source).ptr();
178   DCHECK(rph);
179   RemoveCertsForRenderProcesHost(rph->GetID());
180 }
181
182 }  // namespace content