[openssl-users] Failed TLSv1.2 handshake

Nounou Dadoun nounou.dadoun at avigilon.com
Mon Dec 7 22:46:26 UTC 2015

Hi folks, running into a failed handshake problem -

Although we upgraded to openssl 1.0.2d last summer, we had never changed our context setup from accepting any version other than TLSv1, i.e. (in boost)
m_context(pIoService->GetNative(), boost::asio::ssl::context::tlsv1)

When we recently changed to accepting other versions (didn't matter if we disabled sslv2 and sslv3) to (in boost):
m_context(pIoService->GetNative(), boost::asio::ssl::context::sslv23)

our ssl handshakes started failing with "decryption failed or bad record mac"

I've attached a packet capture, the client does a TLSv1.2 CLIENT HELLO and offers up 72 cipher suites.

The server responds with the SERVER HELLO, CERTIFICATE, SERVER HELLO DONE and appears to select 
Cipher Suite: TLS_RSA_WITH_AES_256_GCM_SHA384 (0x009d)

and then the exchange appears to finish with the above error in the server log.

The cipher setting on the server is:
SSL_CTX_set_cipher_list(pSslContext->GetNativeRef().impl(),  "ALL:SEED:!EXPORT:!LOW:!DES:!RC4");

Any suggestions?  Is it possible that we've selected a cipher setting which is not compiled in?

Thanks in advance for any help ... N

Nou Dadoun
Senior Firmware Developer, Security Specialist

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