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dirmngr: Implement CRL fetching via https.

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* dirmngr/http.h (HTTP_FLAG_TRUST_CFG): New flag.
* dirmngr/http.c (http_register_cfg_ca): New.
(http_session_new) [HTTP_USE_GNUTLS]: Implement new trust flag.
* dirmngr/certcache.c (load_certs_from_dir): Call new function.
(cert_cache_deinit): Ditto.
* dirmngr/http-ntbtls.c (gnupg_http_tls_verify_cb): Ditto.
* dirmngr/ks-engine-http.c (ks_http_fetch): Add new args
'send_no_cache' and 'extra_http_trust_flags'.  Change all callers to
provide the default value.
* dirmngr/crlfetch.c (crl_fetch): Rewrite to make use of
ks_http_fetch.
--

The old code simply did not use https for downloading of CRLS.
Instead it rewrote https to http under the assumption that the CRL
service was also available without encryption.  Note that a CRL is
self-standing and thus it does not need to have extra authenticity as
provided by TLS.  These days we should not use any unencrypted content
and thus this patch.

Be aware that cacert.org give a https CRL DP but that currently
redirects to to http!  This is a downgrade attack which we detect and
don't allow.  The outcome is that it is right now not possible to use
CAcert certificates.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2018-04-25 09:43:18 +02:00
parent 71903eee89
commit 705d8e9cf0
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GPG key ID: E3FDFF218E45B72B
10 changed files with 131 additions and 129 deletions
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5
dirmngr/ks-action.c
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@ -257,7 +257,8 @@ ks_action_get (ctrl_t ctrl, uri_item_t keyservers,
if (is_hkp_s)
err = ks_hkp_get (ctrl, uri->parsed_uri, sl->d, &infp);
else if (is_http_s)
err = ks_http_fetch (ctrl, uri->parsed_uri->original, &infp);
err = ks_http_fetch (ctrl, uri->parsed_uri->original, 1, 0,
&infp);
else
BUG ();
@ -314,7 +315,7 @@ ks_action_fetch (ctrl_t ctrl, const char *url, estream_t outfp)
if (parsed_uri->is_http)
{
err = ks_http_fetch (ctrl, url, &infp);
err = ks_http_fetch (ctrl, url, 1, 0, &infp);
if (!err)
{
err = copy_stream (infp, outfp);