问题
I have seen this question around the forums but couldn't find any appropriate fix. Also all those questions are missing some info, so thought to put all what i have learned here. connecting the dots.
I am working with SSL/TLS in openfire with 2 way authentication. Got a self signed wildcard certificate. which means i have my CA in both client and server. Now this works but sometimes, SSL handshake stucks at some particular line. Logs from server side:
org.apache.mina.filter.ssl.SslFilter - Session Server[40](ssl...): Processing the SSL Data
On client side, I am using SMACK so building the configuration i gave around 2 min reply timeout just to check the behaviour; I also set hostNameVerifier.
So when ever it hangs, following logs i can see:
05-07 17:35:45.705 D/SMACK: SENT (1): <stream:stream xmlns='jabber:client' to='mydomain.com' xmlns:stream='http://etherx.jabber.org/streams' version='1.0' xml:lang='en'>
05-07 17:35:45.712 D/SMACK: RECV (1): <?xml version='1.0' encoding='UTF-8'?><stream:stream xmlns:stream="http://etherx.jabber.org/streams" xmlns="jabber:client" from="mydomain.com" id="9haislljp2" xml:lang="en" version="1.0">
05-07 17:35:45.721 D/SMACK: RECV (1): <stream:features><starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"><required/></starttls><mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl"><mechanism>PLAIN</mechanism><mechanism>EXTERNAL</mechanism></mechanisms></stream:features>
05-07 17:35:45.723 D/SMACK: SENT (1): <starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'></starttls>
05-07 17:35:45.730 D/SMACK: RECV (1): <proceed xmlns="urn:ietf:params:xml:ns:xmpp-tls"/>
And here it hangs for undefined time, sometimes its around 20 seconds, sometimes a minute or more.
But right after that the very first log i see is:
05-07 17:36:15.151 : HostNameVerifier callback verify: hostname:mydomain.com SessionID:[B@3cedf14
CipherSuite:TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
Protocol:TLSv1.2
05-07 17:36:15.153 D/SMACK: SENT (1): <stream:stream xmlns='jabber:client' to='mydomain' xmlns:stream='http://etherx.jabber.org/streams' version='1.0' xml:lang='en'>
05-07 17:36:15.161 D/SMACK: RECV (1): <?xml version='1.0' encoding='UTF-8'?><stream:stream xmlns:stream="http://etherx.jabber.org/streams" xmlns="jabber:client" from="mydomain.com" id="9haislljp2" xml:lang="en" version="1.0"><stream:features><mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl"><mechanism>PLAIN</mechanism><mechanism>EXTERNAL</mechanism></mechanisms><compression xmlns="http://jabber.org/features/compress"><method>zlib</method></compression><register xmlns="http://jabber.org/features/iq-register"/></stream:features>
and XMPP is connected.
So I looked into this hostname verifier functionality from jdk and other source, I am not sure but quite came to idea that it was doing some dns lookup. I also put my domain with ip in etc/hosts. so that should avoid dns lookups but still. Anyhow, would appreciate if anyone can point to something concrete.
Links I followed:
Apache MINA - stuck on SSL connection
How to disable Java's SSL Reverse DNS Lookup
Android 4.2 slow SSL/TLS
If anyone needs anymore info, will be more than happy to share.
Openfire Version: 4.1.3
Smack Version: 4.2.0
Ubuntu running openfire: 16.04
JDK installed: openjdk 7,8 (tried with both)
来源：https://stackoverflow.com/questions/43863646/ssl-handshake-hang