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コミット
f6b77e1b27
34
README.md
34
README.md
@ -2,3 +2,37 @@ buggy_openssl_with_fullduplex
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=============================
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Toy code which shows problems with non-blocking, fullduplex I/O & renegotiation in OpenSSL
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How it works:
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Client & Server:
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- it has two threads - sender & receiver
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- writes and reads are mutexed
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Client:
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- I/O is blocking (but can be non-blocking)
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Server:
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- I/O is non-blocking
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- each thread runs it's own select()
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1. After client & server are connected (and SSL handshake done) client sender
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thread starts sending first message (in a loop).
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2. When server receives first query it starts sending string EXCHANGE_STRING for
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SEND_ITERATIONS number of times. So now we have 4 threads that are sending
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and receiving traffic at the same time ( 2 send/receive threads on each
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server and client side )
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3. When client receives RENEG_INIT_LEN number of characters it starts
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renegotiation ( if other one is not pending ). Bug starts to occure here
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BUG:
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Client side: client starts to report SSL_ERROR_SYSCALL
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Server side: server reports SSL_ERROR_WANT_READ when receive function is called
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TCP:
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In TCP exchange we can see that transfer between client & server is OK until
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client sends "Client Hello" packet. This packet is sent when SSL_renegotiate
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is called
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@ -45,9 +45,11 @@ bool handle_error_code(int& len, SSL* SSLHandler, int code, const char* func)
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break;
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case SSL_ERROR_WANT_READ:
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cout << func << " WANT READ" << endl;
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return true;
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break;
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case SSL_ERROR_WANT_WRITE:
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cout << func << " WANT WRITE" << endl;
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return true;
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break;
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case SSL_ERROR_SYSCALL:
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cout << func << " ESYSCALL" << endl;
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@ -55,10 +57,12 @@ bool handle_error_code(int& len, SSL* SSLHandler, int code, const char* func)
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break;
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case SSL_ERROR_SSL:
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cout << func << " ESSL" << endl;
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return true;
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exit(1);
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break;
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default:
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cout << func << " SOMETHING ELSE" << endl;
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return true;
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exit(1);
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}
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@ -75,9 +79,7 @@ void Sender()
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int len = 0;
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do
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{
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bool flag = true;
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while( flag )
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while( 1 )
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{
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lock_guard<mutex> lock(WriteReadMutex);
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cout << "SSL_write: start" << endl;
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