Re: systematic loading of ca-certificates.crt

On Fri, Feb 14, 2025 at 4:16 PM Sorin Manolache via curl-library
<[email protected]> wrote:
>
> Hello,

[...]
> I notice that /etc/ssl/certs/ca-certificates.crt is loaded every time I open a connection to a https URL.
>
[...]
> Is there a way to use libcurl such that the certificate store is cached and shared with a connection upon the connection's creation? ca-certificates.crt has about 270 kB and loading it every time we open an SSL connection has an impact on the connection time, especially in a multi-handle setup in which we could open tens of connections simultaneously.


If you're using OpenSSL as your backend, you can use a hashed
certificate directory instead of a single file by pointing
https://curl.se/libcurl/c/CURLOPT_CAPATH.html to just such a directory
if you OS distribution is not already doing that for you. You may have
to set CURLOPT_CAINFO explicitly to NULL, a file with a single
certificate or even an empty file, depending on how your curl /
openssl have been compiled to actually benefit from the hashed
CURLOPT_CAPATH directory.

Rainer

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