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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/cert_store.h"
#include <algorithm>
#include <functional>
#include "base/stl_util-inl.h"
#include "chrome/browser/renderer_host/render_process_host.h"
#include "chrome/browser/renderer_host/render_view_host.h"
#include "chrome/common/notification_service.h"
template <typename T>
struct MatchSecond {
explicit MatchSecond(const T& t) : value(t) {}
template<typename Pair>
bool operator()(const Pair& p) const {
return (value == p.second);
}
T value;
};
// static
CertStore* CertStore::GetInstance() {
return Singleton<CertStore>::get();
}
CertStore::CertStore() : next_cert_id_(1) {
// We watch for RenderProcess termination, as this is how we clear
// certificates for now.
// TODO(jcampan): we should be listening to events such as resource cached/
// removed from cache, and remove the cert when we know it
// is not used anymore.
registrar_.Add(this, NotificationType::RENDERER_PROCESS_TERMINATED,
NotificationService::AllSources());
registrar_.Add(this, NotificationType::RENDERER_PROCESS_CLOSED,
NotificationService::AllSources());
}
CertStore::~CertStore() {
}
int CertStore::StoreCert(net::X509Certificate* cert, int process_id) {
DCHECK(cert);
base::AutoLock autoLock(cert_lock_);
int cert_id;
// Do we already know this cert?
ReverseCertMap::iterator cert_iter = cert_to_id_.find(cert);
if (cert_iter == cert_to_id_.end()) {
cert_id = next_cert_id_++;
// We use 0 as an invalid cert_id value. In the unlikely event that
// next_cert_id_ wraps around, we reset it to 1.
if (next_cert_id_ == 0)
next_cert_id_ = 1;
cert->AddRef();
id_to_cert_[cert_id] = cert;
cert_to_id_[cert] = cert_id;
} else {
cert_id = cert_iter->second;
}
// Let's update process_id_to_cert_id_.
if (std::find_if(process_id_to_cert_id_.lower_bound(process_id),
process_id_to_cert_id_.upper_bound(process_id),
MatchSecond<int>(cert_id)) ==
process_id_to_cert_id_.upper_bound(process_id)) {
process_id_to_cert_id_.insert(std::make_pair(process_id, cert_id));
}
// And cert_id_to_process_id_.
if (std::find_if(cert_id_to_process_id_.lower_bound(cert_id),
cert_id_to_process_id_.upper_bound(cert_id),
MatchSecond<int>(process_id)) ==
cert_id_to_process_id_.upper_bound(cert_id)) {
cert_id_to_process_id_.insert(std::make_pair(cert_id, process_id));
}
return cert_id;
}
bool CertStore::RetrieveCert(int cert_id,
scoped_refptr<net::X509Certificate>* cert) {
base::AutoLock autoLock(cert_lock_);
CertMap::iterator iter = id_to_cert_.find(cert_id);
if (iter == id_to_cert_.end())
return false;
if (cert)
*cert = iter->second;
return true;
}
void CertStore::RemoveCertInternal(int cert_id) {
CertMap::iterator cert_iter = id_to_cert_.find(cert_id);
DCHECK(cert_iter != id_to_cert_.end());
ReverseCertMap::iterator id_iter = cert_to_id_.find(cert_iter->second);
DCHECK(id_iter != cert_to_id_.end());
cert_to_id_.erase(id_iter);
cert_iter->second->Release();
id_to_cert_.erase(cert_iter);
}
void CertStore::RemoveCertsForRenderProcesHost(int process_id) {
base::AutoLock autoLock(cert_lock_);
// We iterate through all the cert ids for that process.
IDMap::iterator ids_iter;
for (ids_iter = process_id_to_cert_id_.lower_bound(process_id);
ids_iter != process_id_to_cert_id_.upper_bound(process_id);) {
int cert_id = ids_iter->second;
// Remove this process from cert_id_to_process_id_.
IDMap::iterator proc_iter =
std::find_if(cert_id_to_process_id_.lower_bound(cert_id),
cert_id_to_process_id_.upper_bound(cert_id),
MatchSecond<int>(process_id));
DCHECK(proc_iter != cert_id_to_process_id_.upper_bound(cert_id));
cert_id_to_process_id_.erase(proc_iter);
if (cert_id_to_process_id_.count(cert_id) == 0) {
// This cert is not referenced by any process, remove it from id_to_cert_
// and cert_to_id_.
RemoveCertInternal(cert_id);
}
// Erase the current item but keep the iterator valid.
process_id_to_cert_id_.erase(ids_iter++);
}
}
void CertStore::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
DCHECK(type == NotificationType::RENDERER_PROCESS_TERMINATED ||
type == NotificationType::RENDERER_PROCESS_CLOSED);
RenderProcessHost* rph = Source<RenderProcessHost>(source).ptr();
DCHECK(rph);
RemoveCertsForRenderProcesHost(rph->id());
}
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