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Fix OpenSSL certificate errors on Ruby 2.0

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OpenSSL fix.md
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The reason why you might get certificate errors in Ruby 2.0 when talking HTTPS is because there isn't a default certificate bundle that OpenSSL (which was used when building Ruby) trusts.

Update: this problem is solved in edge versions of rbenv and RVM.

$ ruby -rnet/https -e "Net::HTTP.get URI('https://github.com')"
net/http.rb:917:in `connect': SSL_connect returned=1 errno=0 state=SSLv3
  read server certificate B: certificate verify failed (OpenSSL::SSL::SSLError)

You can work around the issue by installing a certificate bundle that you trust. I trust Mozilla and curl.

WARNING: use the below code only if you're not terribly worried about maximum security:

  1. Note that the certificate bundle below is downloaded from curl.haxx.se over HTTP not HTTPS.
  2. Keep in mind that this installs a cert bundle that will never be automatically updated if a cert gets revoked.
curl -fsSL curl.haxx.se/ca/cacert.pem \
  -o "$(ruby -ropenssl -e 'puts OpenSSL::X509::DEFAULT_CERT_FILE')"

And if you want to acquire that secure .pem file without being vulnerable to a MitM attack, here's how: https://gist.github.com/jjb/996292 :-D

(i got them to switch to https in curl trunk, but then it got reverted later because the Perl library for https isn't reliable)

Thanks it works
Let's hope RVM or something else will deal with this problem automatically later

Or...you could just link the existing cacert.pem to cert.pem in that same directory and fix the problem without having to download anything. ;-)

@codeslinger: I just learned about that existing after I created the gist…

Did not work for ruby 2.0.0-p195 actually. The most simple fix is to use without certificate.

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