tls: remove unused ocsp extension parsing

The OCSP info from parsing the TLS ClientHello has not been used since
550c263, remove it.

See: nodejs#1464

Author: sam-github

src/node_crypto.cc

@@ -1559,9 +1559,6 @@ void SSLWrap<Base>::OnClientHello(void* arg,
   hello_obj->Set(context,
                  env->tls_ticket_string(),
                  Boolean::New(env->isolate(), hello.has_ticket())).FromJust();
-  hello_obj->Set(context,
-                 env->ocsp_request_string(),
-                 Boolean::New(env->isolate(), hello.ocsp_request())).FromJust();
 
   Local<Value> argv[] = { hello_obj };
   w->MakeCallback(env->onclienthello_string(), arraysize(argv), argv);

src/node_crypto_clienthello-inl.h

@@ -48,7 +48,6 @@ inline void ClientHelloParser::Reset() {
   tls_ticket_ = nullptr;
   servername_size_ = 0;
   servername_ = nullptr;
-  ocsp_request_ = 0;
 }
 
 inline void ClientHelloParser::Start(ClientHelloParser::OnHelloCb onhello_cb,

src/node_crypto_clienthello.cc

@@ -112,7 +112,6 @@ void ClientHelloParser::ParseHeader(const uint8_t* data, size_t avail) {
   hello.session_id_ = session_id_;
   hello.session_size_ = session_size_;
   hello.has_ticket_ = tls_ticket_ != nullptr && tls_ticket_size_ != 0;
-  hello.ocsp_request_ = ocsp_request_;
   hello.servername_ = servername_;
   hello.servername_size_ = static_cast<uint8_t>(servername_size_);
   onhello_cb_(cb_arg_, hello);
@@ -149,18 +148,6 @@ void ClientHelloParser::ParseExtension(const uint16_t type,
         }
       }
       break;
-    case kStatusRequest:
-      // We are ignoring any data, just indicating the presence of extension
-      if (len < kMinStatusRequestSize)
-        return;
-
-      // Unknown type, ignore it
-      if (data[0] != kStatusRequestOCSP)
-        break;
-
-      // Ignore extensions, they won't work with caching on backend anyway
-      ocsp_request_ = 1;
-      break;
     case kTLSSessionTicket:
       tls_ticket_size_ = len;
       tls_ticket_ = data + len;

src/node_crypto_clienthello.h

@@ -41,15 +41,13 @@ class ClientHelloParser {
     inline bool has_ticket() const { return has_ticket_; }
     inline uint8_t servername_size() const { return servername_size_; }
     inline const uint8_t* servername() const { return servername_; }
-    inline int ocsp_request() const { return ocsp_request_; }
 
    private:
     uint8_t session_size_;
     const uint8_t* session_id_;
     bool has_ticket_;
     uint8_t servername_size_;
     const uint8_t* servername_;
-    int ocsp_request_;
 
     friend class ClientHelloParser;
   };
@@ -69,7 +67,6 @@ class ClientHelloParser {
   static const size_t kMaxTLSFrameLen = 16 * 1024 + 5;
   static const size_t kMaxSSLExFrameLen = 32 * 1024;
   static const uint8_t kServernameHostname = 0;
-  static const uint8_t kStatusRequestOCSP = 1;
   static const size_t kMinStatusRequestSize = 5;
 
   enum ParseState {
@@ -93,7 +90,6 @@ class ClientHelloParser {
 
   enum ExtensionType {
     kServerName = 0,
-    kStatusRequest = 5,
     kTLSSessionTicket = 35
   };
 
@@ -115,7 +111,6 @@ class ClientHelloParser {
   const uint8_t* session_id_ = nullptr;
   uint16_t servername_size_ = 0;
   const uint8_t* servername_ = nullptr;
-  uint8_t ocsp_request_ = 0;
   uint16_t tls_ticket_size_ = -1;
   const uint8_t* tls_ticket_ = nullptr;
 };