[ruby-core:78649] [Ruby trunk Bug#10613] SNI is not optional when using TLS

Issue #10613 has been updated by Ben Schmeckpeper.


Unfortunately, I don't know any details about the server.  It's not a box that we own.

I am connecting over an SSH tunnel, so the hostname being used for SNI is 127.0.0.1.  The server simply returns a 400; my best guess is that it's not configured to use a default certificate for unknown hostnames.  (I can make things work by editing /etc/hosts locally, but that's not a viable approach in our production environment.)

I am able to set the Host and Location headers, but have not been able to find a better solution than mokeypatching Net::HTTP#connect to disable SNI for connections to this server.

In my case, the cert on this server is expired, so I don't even verify it.  For what it's worth, cURL does not perform SNI when certificate checking is disabled (using the -k or --insecure flag.)

(Sorry for the delay in getting back to you, I had just created my account and wasn't watching this issue.)

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Bug #10613: SNI is not optional when using TLS
https://bugs.ruby-lang.org/issues/10613#change-62032

* Author: Eddy Kim
* Status: Assigned
* Priority: Normal
* Assignee: Yui NARUSE
* Target version: 
* ruby -v: 2.1
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
If ruby is using openssl with TLS extensions, and we attempt to connect to a server which supports TLS, but not SNI, the connection fails.

e.g.:

~~~Ruby
uri = URI.parse("https://example.com") # a server that supports TLSv1 but not the TLS extensions
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
http.ssl_version = :TLSv1
http.verify_mode = OpenSSL::SSL::VERIFY_PEER
response = http.get(url)
~~~
~~~
OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=SSLv3 read server hello B: parse tlsext
~~~

If I patch the `Net::HTTP#connect` method to not assign the hostname to the socket (s), we can avoid this error.



---Files--------------------------------
optional-sni.patch (1019 Bytes)


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