[PATCH 3 of 3] [RFC] sslutil: try to find and use system CA file when appropriate

Yuya Nishihara yuya at tcha.org
Fri Jul 1 10:02:30 EDT 2016

On Thu, 30 Jun 2016 08:06:25 -0700, Gregory Szorc wrote:
> ssl.SSLContext.load_verify_locations() specifies 2 ways to load certs: via
> a single file and via a path containing files with hashes of CAs.
> When you load a directory, the certs are loaded on demand as they are
> encountered through connection activity. Only then do the certs show up in
> cert_store_stats().
> Debian and Ubuntu appear to be using this directory-based cert loading.
> RHEL is using the file-based one. And FWIW Mercurial only supports
> specifying a config option for loading certs from a file. We /could/
> support loading from a directory if we wanted. Although I haven't heard
> anybody clamor for this, so I'm not going to do it.

Ah, that's why I saw nothing returned by get_ca_certs() until a socket
connected to somewhere.

On Windows, CA certificates seem to be loaded by create_default_context(),
but it might be an implementation detail.

> Anyway, what this means is that "are any CAs loaded" is a bit difficult to
> implement on systems loading certs from directories because CA count == 0
> could mean either no CAs loaded or the CA wanted by the server connection
> just isn't present locally. I'll likely have to tweak the warning message
> for "no CAs loaded" that I added a few hours ago and Yuya recently queued.
> I'll also have to look into behavior on Windows and OS X to see if they are
> reporting counts in cert_store_stats(). Perhaps it would be best to prune
> that last patch from the committed repo until I get a handle on things. If
> not, I'll send follow-up commits.

The patch has been published due to the lag of the list?

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