Will SSL protocol ask for handshake after intial handshake ?
I mean once handshake is done and data transfer is happening. Is there any case in which handshake/authentication needs to be done ? If so, in which case ?
Yes. Either of the peers can request a new handshake at any time: to strengthen the cipher suite, ask for a client certificate, etc, or just to negotiate a new session key.
Related
I've written a MIDlet server that handle tcp inputstream. I send xmlhttprequest with an http:// url from a html web page and it works fine. I want to do the same with an https url.
with my secureserverconnection instancied by a connector.open the accecptandopen() method return an exception.
handshake client send
As you can see the xmlhttprequest send an handshake hello but I've notices tls1.2 protocol then tls1.0 protocol and finally tls1.2.
Is it normal having 2 different protocol sent by the client. It is the first phase of the handshake protocol.
My Midlet java server respond with an Alert and a a "ssl3_get_client_hello:no shared cipher" error (IOException)
IOexception capture
I've specified the connector options like this : cipher : TLS_RSA_WITH_AES_128_GCM_SHA256 and TLSv1.2 protocol
tlsv1.2 server response
Have someone ever done it or can explain me why the cipher handshake is in error?
Yes it is normal for the client to try both protocols. The most likely scenario is that your device simply lacks any valid certificates, since J2ME devices are so old.
See:
"ssl3_get_client_hello:no shared cipher" in server depending on server certificate and key
Reading mTLS from wikipedia
Is mTLS in microservices and the communication between services faster than if only TLS?
I mean if using only TLS the handshaking occurs each time a communication is being established between client & server.
If mTLS the handshaking only occurs once and the connection is kept to next communication/connection - and therefore faster?
Is this correct?
This is not correct.
Mutual authentication means that a client certificate is requested by the server additionally to the normal TLS handshake in order to authenticate the client. As for keeping the established TS connection open or using session resumption: this is possible for both "normal" TLS and TLS with mutual authentication.
Hey everyone just a quick question.
Lets say I am connected to a server with a SSL connection. Now say while I am connected the Certificate expires. Will the connection close or is nothing going to happen at all?
I would think that nothing will happen at all but I'm not 100 % sure.
It depends on the client implementation.
However, the connection will likely remain active as the validity of the certificate is checked during the TLS/SSL handshake, which happens once at the beginning of the session when the connection is opened.
The certificate will be checked once for validity at the beginning of the connection, and again during the connection (or a subsequent one sharing the same session) if either side requests a full handshake, which is usually only done to escalate the cipher suites, request a client certificate, etc.
To extend the other answers: the certificate will only be checked within a full handshake. Usually at most one full handshake is done per TCP connection (at the beginning) but with renegotiation another full handshake might be done.
But with session resumption only the first TCP connection in the SSL session will do a full handshake. This means that it will not detect a changed or expired certificate even when establishing a new TCP connection as long as an existing SSL session is resumed inside this TCP connection.
The reasoning behind this: The certificate is used to make sure that the SSL session is with the expected party and not some man in the middle attacker. So it must be checked at the beginning of the SSL session, i.e. a whenever a full handshake is done. Since an established SSL session is integrity protected a man in the middle tampering with the connection would be detected. So one does not again need to verify the certificate during the SSL.
A client installed on jBOSS is trying to access a secured website configured on DataPower xi50v6.0.0.2 appliance. The connection is getting failed at SSL handshake.
I have taken a packet capture at DataPower and observed that SSL Handshake is failing with the Description:Handshake failure(40).
However, at the Client Hello step, I have observed that, only one Cipher Suite is specified which is : TLS_EMPTY_RENEGOTIATION_INFO_SCSV.
The TLS protocol used ( as per packet capture) is TLS1.1. Can this Cipher Suite be a problem?
In the DataPower system logs I can see below error:
Request processing failed: Connection terminated before request headers read because of the connection error occurs
Update:
The client application is running on jBOSS7.I have asked our jBOSS administrator to check the configuration at jBOSS end. I somehow got the access to server where jBOSS instance is installed and checked domain.xml where the ssl is configured. Where exactly in domain.xml, ths configuration related to cipher suites can be found?
I have observed that, only one Cipher Suite is specified which is : TLS_EMPTY_RENEGOTIATION_INFO_SCSV
This is no real cipher. If no other ciphers are specified then the client does not offer any ciphers at all which means that no shared ciphers can be found and thus the handshake will fail. It looks like the client is buggy. Reason might be a failed attempt to fight POODLE attack by disabling all SSL3.0 ciphers, which in effect disables all ciphers for TLS1 1.0 and TLS 1.1.
I've set out to handle tls operations manually on a websockets server, due to the cockeyed way php supports listening on secured transports.From RFC6455:
If /secure/ is true, the client MUST perform a TLS handshake over the
connection after opening the connection and before sending the
handshake data [RFC2818]. If this fails (e.g., the server's
certificate could not be verified), then the client MUST Fail the
WebSocket Connection and abort the connection. Otherwise, all
further communication on this channel MUST run through the encrypted
tunnel [RFC5246].
According to this, the first thing I should receive is the clientHello message which signifies the beginning of a TLS handshake.But all I receive on the server is the websocket handshake request, encrypted.
I am baffled by this.Is there no TLS handshake at all?