Bug 423551

IRC discussion I had about this last week:
<pcfe_laptop> hello. ssl cert question (and do feel free to point me at the
relevant docs, my hunt through docs came up empty but I may very well have
missed it)
<pcfe_laptop> does claws use the system-wide ca-bundle to check it's certs? In
my openssl-0.9.8b-17.fc8 that would be /etc/pki/tls/certs/ca-bundle.crt
<-- TuxCM- has quit (Read error: 110 (Connection timed out))
<pcfe_laptop> because if it does then I need to nag at my provider as I get
presented a cert that claims to be signed by verisign but claws says that it is
'unable to get local issuer certificate' which I understand as it being unable
to verify the cert.
<colinl> pcfe_laptop: which claws version?
<pcfe_laptop> colinl: Claws Mail version 3.1.0
<colinl> compiled against openssl or gnutls?
<pcfe_laptop> colinl: mompls, let me grab the srpm and check
<pcfe_laptop> BuildRequires:  openssl-devel >= 0.9.7
<pcfe_laptop> %configure --enable-openssl --enable-ipv6 \
<pcfe_laptop>            --enable-ldap --enable-jpilot \
<pcfe_laptop>            --enable-spamassassin-plugin \
<pcfe_laptop>            --enable-aspell \
<pcfe_laptop>            --disable-dependency-tracking \
<pcfe_laptop>            --disable-rpath \
<pcfe_laptop>            --enable-compface
<pcfe_laptop> colinl: so it would seem against openssl
<colinl> ok
<colinl> so it's proablby not claws' fault
<colinl> try with openssl:
<colinl> openssl s_client -connect colino.net:995
<colinl> (replace colino.net:995 with the host:port of your ISP's mail host)
<pcfe_laptop> colinl: you are right, it is not claws' fault;     Verify return
code: 20 (unable to get local issuer certificate)
<colinl> ok :)
<pcfe_laptop> and I guess this is the problem: No client certificate CA names sent
<pcfe_laptop> colinl: hmm, this works
<pcfe_laptop> openssl s_client -CAfile /etc/pki/tls/certs/ca-bundle.crt -connect
mail.kolumbus.fi:993
<pcfe_laptop> openssl oddity then, I'll take it up with the package maintainer
<colinl> hmm, strange that openssl doesn't find them

>But I have looked at the claws-mail sources and this bug doesn't apply there and
>it apparently does some certificate chain verification on its own so this bug
>should be cloned for claws-mail if you want to have it fixed there too.

Claws Mail does nothing on its own to check certificate chains. It just calls
SSL_CTX_set_default_verify_paths(ssl_ctx);

this uses X509_CERT_DIR and/or X509_CERT_FILE, which are defined in openssl as
#define X509_CERT_DIR           OPENSSLDIR "/certs"
#define X509_CERT_FILE          OPENSSLDIR "/cert.pem"

The CVS version of Claws Mail now checks for the existence of the following files:
                "/etc/pki/tls/certs/ca-bundle.crt",
                "/etc/certs/ca-bundle.crt",
                "/usr/share/ssl/certs/ca-bundle.crt",
                "/etc/ssl/certs/ca-certificates.crt",
                "/usr/local/ssl/certs/ca-bundle.crt",
                "/etc/apache/ssl.crt/ca-bundle.crt",
                "/usr/share/curl/curl-ca-bundle.crt",
                "/usr/share/curl/curl-ca-bundle.crt",
                "/usr/lib/ssl/cert.pem",

It uses the first found, unless SSL_CERT_FILE is defined in the environment.
If none is found, it now uses certificates found in the following directories:
                "/etc/pki/tls/certs",
                "/etc/certs",
                "/usr/share/ssl/certs",
                "/etc/ssl/certs",
                "/usr/local/ssl/certs",
                "/etc/apache/ssl.crt",
                "/usr/share/curl",
                "/usr/lib/ssl/certs",

It uses the first found, unless SSL_CERT_DIR is defined in the environment.

HTH