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=begin
Copyright (c) 2015 Red Hat inc
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
=end
require 'socket'
require 'openssl'
module Something
# @param dst [String] the hostname or IP of SSL server
# @param port [String, Integer] the port number to connect
# @param hostname [String] hostname for using SNI connection
# @return [Array] the certificate chain used by secure server;
# correct order is host cert first and then deeper down the chain.
# In reality though, admins do not always do the right thing
# (see https://utcc.utoronto.ca/~cks/space/blog/tech/SSLChainOrder).
# So I'm not sure whether the library always returns correct order here.
def self.get_cert_chain(dst:, port:, hostname: nil)
context = OpenSSL::SSL::SSLContext.new
context.verify_mode = OpenSSL::SSL::VERIFY_NONE
tcp_client = TCPSocket.new host, port.to_i
ssl_client = OpenSSL::SSL::SSLSocket.new tcp_client, context
ssl_client.hostname = hostname if hostname
ssl_client.connect
# ssl_client.peer_cert
chain = ssl_client.peer_cert_chain
ssl_client.close
return chain
end
end
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