RogerBW's Blog

Happiness is a warm SSLLabs test 11 August 2018

I've recently set up HTTPS on the servers at work, running in parallel with HTTP. For reasons which were good at the time and are still not entirely wrong, we're using lighttpd as a front-end, and the process was less trivial than I'd have preferred.

Because of the system architecture, I wanted DNS validation, which in practice meant certbot in manual mode. OK, we can do that. But what to do with the various files it produces? It turns out that the answer is, and I put this here for anyone else who has to fight the documentation:

  • concatenate cert.pem and privkey.pem to server.pem on the server
  • copy chain.pem to the server under that name
  • put both those files in the right place, owned and readable only by root
  • then include them in the server configuration, as well as a modern cipher set (note different syntax from Apache, replacing + with - and space with colon; note also cargo-culted list with obvious inconsistency)
  • and finally, enable HSTS

The server configuration ends up looking like this:

server.modules += ( "mod_setenv" )
setenv.add-response-header = \
  ( "Strict-Transport-Security" => "max-age=15768000"  )

$SERVER["socket"] == ":443" {
  ssl.engine  = "enable"
  ssl.pemfile = "/etc/lighttpd/server.pem" = "/etc/lighttpd/chain.pem"
  ssl.honor-cipher-order = "enable"

(Note that I don't know whether \ continuations actually work in lighttpd config - I've just put them in to make it more readable by splitting up long lines.)

and I have an A+ SSLLabs test result.

  1. Posted by Ashley R Pollard at 09:10pm on 11 August 2018

    I had to reduce the page to 67% to see all the text and side-bar.

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