The Boston Diaries

The ongoing saga of a programmer who doesn't live in Boston, nor does he even like Boston, but yet named his weblog/journal “The Boston Diaries.”

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Monday, August 06, 2018

It seems that checking the TLS API version number is useless

I've pretty much finished the Lua TLS module and before releasing it, I thought it might be nice to ensure it compiles with previous versions of libtls. The main header file contains the defined value TLS_API, which I assume is updated whenever the API is updated. So I began the arduous procedure of downloading previous versions of libtls to ensure I can compile against any version.

I started with LibreSSL version 2.7.4 (current when I started—they are now up to 2.8.0 as I write this). The defined value TLS_API had a value of “20180210”. I checked version 2.7.0 and no change in libtls. It wasn't until I got into the pre-2.7 versions that things started going south.

The previous version of TLS_API, “20170126”, was first defined in 2.5.1, and last used in 2.6.5. But the API changed quite a bit between versions 2.5.1 and 2.6.5. Five functions were added:

  1. tls_config_set_crl_file()
  2. tls_config_set_crl_mem()
  3. tls_config_set_ecdhecurves()
  4. tls_peer_cert_chain_pem()
  5. tls_unload_file()

What's the point of having a defined value like TLS_API if it doesn't change when you add new functions?

Fortunately, the defined value LIBRESSL_VERSION_NUMBER is updated per version, so at least I can use that.

Sigh.

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