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      1 /*
      2  * libjingle
      3  * Copyright 2004--2008, Google Inc.
      4  * Copyright 2011, RTFM, Inc.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions are met:
      8  *
      9  *  1. Redistributions of source code must retain the above copyright notice,
     10  *     this list of conditions and the following disclaimer.
     11  *  2. Redistributions in binary form must reproduce the above copyright notice,
     12  *     this list of conditions and the following disclaimer in the documentation
     13  *     and/or other materials provided with the distribution.
     14  *  3. The name of the author may not be used to endorse or promote products
     15  *     derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     18  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     20  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     23  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     25  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     26  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef TALK_BASE_NSSSTREAMADAPTER_H_
     30 #define TALK_BASE_NSSSTREAMADAPTER_H_
     31 
     32 #include <string>
     33 #include <vector>
     34 
     35 #include "nspr.h"
     36 #include "nss.h"
     37 #include "secmodt.h"
     38 
     39 #include "talk/base/buffer.h"
     40 #include "talk/base/nssidentity.h"
     41 #include "talk/base/ssladapter.h"
     42 #include "talk/base/sslstreamadapter.h"
     43 #include "talk/base/sslstreamadapterhelper.h"
     44 
     45 namespace talk_base {
     46 
     47 // Singleton
     48 class NSSContext {
     49  public:
     50   NSSContext() {}
     51   ~NSSContext() {
     52   }
     53 
     54   static PK11SlotInfo *GetSlot() {
     55     return Instance() ? Instance()->slot_: NULL;
     56   }
     57 
     58   static NSSContext *Instance();
     59   static bool InitializeSSL(VerificationCallback callback);
     60   static bool InitializeSSLThread();
     61   static bool CleanupSSL();
     62 
     63  private:
     64   PK11SlotInfo *slot_;                    // The PKCS-11 slot
     65   static bool initialized;                // Was this initialized?
     66   static NSSContext *global_nss_context;  // The global context
     67 };
     68 
     69 
     70 class NSSStreamAdapter : public SSLStreamAdapterHelper {
     71  public:
     72   explicit NSSStreamAdapter(StreamInterface* stream);
     73   virtual ~NSSStreamAdapter();
     74   bool Init();
     75 
     76   virtual StreamResult Read(void* data, size_t data_len,
     77                             size_t* read, int* error);
     78   virtual StreamResult Write(const void* data, size_t data_len,
     79                              size_t* written, int* error);
     80   void OnMessage(Message *msg);
     81 
     82   // Key Extractor interface
     83   virtual bool ExportKeyingMaterial(const std::string& label,
     84                                     const uint8* context,
     85                                     size_t context_len,
     86                                     bool use_context,
     87                                     uint8* result,
     88                                     size_t result_len);
     89 
     90   // DTLS-SRTP interface
     91   virtual bool SetDtlsSrtpCiphers(const std::vector<std::string>& ciphers);
     92   virtual bool GetDtlsSrtpCipher(std::string* cipher);
     93 
     94   // Capabilities interfaces
     95   static bool HaveDtls();
     96   static bool HaveDtlsSrtp();
     97   static bool HaveExporter();
     98 
     99  protected:
    100   // Override SSLStreamAdapter
    101   virtual void OnEvent(StreamInterface* stream, int events, int err);
    102 
    103   // Override SSLStreamAdapterHelper
    104   virtual int BeginSSL();
    105   virtual void Cleanup();
    106   virtual bool GetDigestLength(const std::string &algorithm,
    107                                std::size_t *length) {
    108     return NSSCertificate::GetDigestLength(algorithm, length);
    109   }
    110 
    111  private:
    112   int ContinueSSL();
    113   static SECStatus AuthCertificateHook(void *arg, PRFileDesc *fd,
    114                                        PRBool checksig, PRBool isServer);
    115   static SECStatus GetClientAuthDataHook(void *arg, PRFileDesc *fd,
    116                                          CERTDistNames *caNames,
    117                                          CERTCertificate **pRetCert,
    118                                          SECKEYPrivateKey **pRetKey);
    119 
    120   PRFileDesc *ssl_fd_;              // NSS's SSL file descriptor
    121   static bool initialized;          // Was InitializeSSL() called?
    122   bool cert_ok_;                    // Did we get and check a cert
    123   std::vector<PRUint16> srtp_ciphers_;  // SRTP cipher list
    124 
    125   static PRDescIdentity nspr_layer_identity;  // The NSPR layer identity
    126 };
    127 
    128 }  // namespace talk_base
    129 
    130 #endif  // TALK_BASE_NSSSTREAMADAPTER_H_
    131