Any way to prevent cURL from sending the server name in the Extensions:
server_name portion of the Client Hello?

I'm using cURL v7.19.5 on a wintel environment to upload a file using http
over SSL. I'm executing a command like this:

curl -v "https://some.server.com" -E ClientCert.crt --key PrivateKey.pem
--pass SomeFunkyPassword -F file=@SomeBigFile.txt

The receiving party rejects the transmission right off the bat, claiming
they cannot support the hostname in the Client Hello. They request that "
some.server.com" be removed. Can this be done? It appears the offending
hostname apears in the following section of the Client Hello (indicated by
"Data").

Secure Socket Layer
  Content Type: Handshake (22)
  version: TLS 1.0 (0x0301)
  Length: 117
  -Handshake Protocol: Client Hello
    Handshake Type: CLient Hello (1)
    Length: 113
    version: TLS 1.0 (0x0301)
    +Random
    Session ID Length: 0
    Cipher Suites Length: 40
    +Cipher Suites (20 suites)
    Compression Methods Length: 1
    +Compression Methods (1 method)
    Extensions Length: 32
    -Extension: server_name
      Type: server_name (0x0000)
      Length: 28
      Data (28 bytes)

Note - I can get this working by specifying the IP instead (and using the -k
option so that cURL doesn't complain of a hostname / server cert subject
mismatch) but that's something I'd like to avoid if at all possible.

Thanks!
-RCB.

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Received on 2009-07-30