net/cert/cert_database.h

   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 #ifndef NET_CERT_CERT_DATABASE_H_
   6 #define NET_CERT_CERT_DATABASE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "net/base/net_export.h"
  12 #include "net/cert/x509_certificate.h"
  13
  14 template <typename T> struct DefaultSingletonTraits;
  15 template <class ObserverType> class ObserverListThreadSafe;
  16
  17 namespace net {
  18
  19 class NSSCertDatabase;
  20
  21 // This class provides cross-platform functions to verify and add user
  22 // certificates, and to observe changes to the underlying certificate stores.
  23
  24 // TODO(gauravsh): This class could be augmented with methods
  25 // for all operations that manipulate the underlying system
  26 // certificate store.
  27
  28 class NET_EXPORT CertDatabase {
  29  public:
  30   // A CertDatabase::Observer will be notified on certificate database changes.
  31   // The change could be either a new user certificate is added or trust on
  32   // a certificate is changed.  Observers can register themselves
  33   // via CertDatabase::AddObserver, and can un-register with
  34   // CertDatabase::RemoveObserver.
  35   class NET_EXPORT Observer {
  36    public:
  37     virtual ~Observer() {}
  38
  39     // Will be called when a new certificate is added.
  40     virtual void OnCertAdded(const X509Certificate* cert) {}
  41
  42     // Will be called when a certificate is removed.
  43     virtual void OnCertRemoved(const X509Certificate* cert) {}
  44
  45     // Will be called when a CA certificate was added, removed, or its trust
  46     // changed. This can also mean that a client certificate's trust changed.
  47     virtual void OnCACertChanged(const X509Certificate* cert) {}
  48
  49    protected:
  50     Observer() {}
  51
  52    private:
  53     DISALLOW_COPY_AND_ASSIGN(Observer);
  54   };
  55
  56   // Returns the CertDatabase singleton.
  57   static CertDatabase* GetInstance();
  58
  59   // Check whether this is a valid user cert that we have the private key for.
  60   // Returns OK or a network error code such as ERR_CERT_CONTAINS_ERRORS.
  61   int CheckUserCert(X509Certificate* cert);
  62
  63   // Store user (client) certificate. Assumes CheckUserCert has already passed.
  64   // Returns OK, or ERR_ADD_USER_CERT_FAILED if there was a problem saving to
  65   // the platform cert database, or possibly other network error codes.
  66   int AddUserCert(X509Certificate* cert);
  67
  68   // Registers |observer| to receive notifications of certificate changes.  The
  69   // thread on which this is called is the thread on which |observer| will be
  70   // called back with notifications.
  71   void AddObserver(Observer* observer);
  72
  73   // Unregisters |observer| from receiving notifications.  This must be called
  74   // on the same thread on which AddObserver() was called.
  75   void RemoveObserver(Observer* observer);
  76
  77 #if defined(OS_MACOSX) && !defined(OS_IOS)
  78   // Configures the current message loop to observe and forward events from
  79   // Keychain services. The MessageLoop must have an associated CFRunLoop,
  80   // which means that this must be called from a MessageLoop of TYPE_UI.
  81   void SetMessageLoopForKeychainEvents();
  82 #endif
  83
  84 #if defined(OS_ANDROID)
  85   // On Android, the system key store may be replaced with a device-specific
  86   // KeyStore used for storing client certificates. When the Java side replaces
  87   // the KeyStore used for client certificates, notifies the observers as if a
  88   // new client certificate was added.
  89   void OnAndroidKeyStoreChanged();
  90
  91   // On Android, the system database is used. When the system notifies the
  92   // application that the certificates changed, the observers must be notified.
  93   void OnAndroidKeyChainChanged();
  94 #endif
  95
  96 #if defined(USE_NSS)
  97   // Observe events from the |source| and forward them to observers of this
  98   // CertDatabase.
  99   void ObserveNSSCertDatabase(NSSCertDatabase* source);
 100 #endif
 101
 102  private:
 103   friend struct DefaultSingletonTraits<CertDatabase>;
 104
 105   CertDatabase();
 106   ~CertDatabase();
 107
 108   // Broadcasts notifications to all registered observers.
 109   void NotifyObserversOfCertAdded(const X509Certificate* cert);
 110   void NotifyObserversOfCertRemoved(const X509Certificate* cert);
 111   void NotifyObserversOfCACertChanged(const X509Certificate* cert);
 112
 113   const scoped_refptr<ObserverListThreadSafe<Observer> > observer_list_;
 114
 115 #if defined(USE_NSS) || (defined(OS_MACOSX) && !defined(OS_IOS))
 116   class Notifier;
 117   friend class Notifier;
 118   scoped_ptr<Notifier> notifier_;
 119 #endif
 120
 121   DISALLOW_COPY_AND_ASSIGN(CertDatabase);
 122 };
 123
 124 }  // namespace net
 125
 126 #endif  // NET_CERT_CERT_DATABASE_H_