Hello,
On Fri, May 27, 2022 at 09:46:51PM +0200, Arrigo Marchiori wrote:
> Hello Damjan,
>
> On Sun, May 22, 2022 at 06:10:46PM +0200, Damjan Jovanovic wrote:
>
> > On Sun, May 22, 2022 at 2:43 PM Arrigo Marchiori <ard...@yahoo.it.invalid>
> > wrote:
> >
> > > Hello Damjan, all,
> > >
> > > On Tue, Apr 26, 2022 at 07:56:22PM +0200, Damjan Jovanovic wrote:
> > >
> > > > On Mon, Nov 15, 2021 at 9:57 PM Jim Jagielski <j...@jagunet.com> wrote:
> > > >
> > > > > I'm gonna look into the serf->(lib)curl option... Since we don't use
> > > any
> > > > > of the fancy features of serf, I'm thinking that the easy option might
> > > be
> > > > > best
> > > >
> > > >
> > > >
> > > > Hi
> > > >
> > > > I've ported our WebDAV content provider module from Serf to Curl.
> > >
> > > I just enhanced the error reporting a bit; I am finding a problem
> > > under Linux and I do not really know how to assess it.
> > >
> > > The problem: if we build AOO on CentOS (that is our reference
> > > platform) then Curl will look for CA certificates in
> > > /etc/pki/tls/certs/ca-bundle.crt
> > >
> > > This will fail on openSUSE and probably on Ubuntu as well.
> > >
> > > It seems that the above path is set at configure time and embedded
> > > into Curl's code as #define macros.
> > >
> > > Is there an ``official'' way to assess this? Like, can we depend on
> > > NSS' certificate store as you wrote (quoted below)?
> > >
> >
> > Curl/OpenSSL have an enormous number of options and I am pretty sure it can
> > be fixed, but first I need to understand where and how it's failing.
> >
> > We currently allow it to run with the default CA certificate path, do
> > pre-verification on the server's certificate using those CA certificates,
> > then call our SSL_VERIFY_PEER function where we override the verification
> > result with the certificates from NSS.
>
> Apparently, it is failing before calling our SSL_VERIFY_PEER function.
>
> > If it's failing before reaching our SSL_VERIFY_PEER function, we should be
> > able to use Curl's CURLOPT_CAINFO or CURLOPT_CAINFO_BLOB functions to set a
> > custom CA certificate path (or in-memory buffer), maybe even an empty
> > buffer, so that it proceeds further. ("man CURLOPT_CAINFO", "man
> > CURLOPT_CAINFO_BLOB", or "man curl_easy_setopt" and read under the "SSL and
> > SECURITY OPTIONS" section.)
>
> So we would need to hard-code and try all possible paths to the CA
> bundle on Unix systems?
>
> > With the CURLOPT_CAINFO_BLOB option it might even be possible to skip the
> > custom certificate verification we do later, and pre-populate Curl/OpenSSL
> > with NSS certificates from the beginning, I just don't know enough about
> > NSS to rely on that (eg. if you are using a cryptographic device or smart
> > card in NSS, how does that work?). If that option is ok, then we might not
> > even need the NSS libraries: recent versions of NSS store all the
> > certificates in an SQLite database, which can be accessed with SQLite APIs
> > directly, no need to build with or ship the NSS libraries at all.
>
> If I understood correctly [1], a NSS-linked Curl would query NSS by
> itself... are we not in this condition?
Sorry, I forgot the link!
Here it is:
1: https://curl.se/libcurl/c/CURLOPT_CAINFO.html
> Thank you in advance and best regards,
--
Arrigo
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