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authorCosimo Cecchi <cosimoc@gnome.org>2010-08-13 00:47:13 +0800
committerCosimo Cecchi <cosimoc@gnome.org>2010-08-13 22:22:24 +0800
commit8d376fae7df339ead4ab9ef2ae588e2762849ccf (patch)
tree3839d8215f9a5f3056d4b38aafab03884da7d187 /libempathy
parentdd4b301661b2516731027eebbf3147692292d749 (diff)
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Implement hostname checking
Diffstat (limited to 'libempathy')
-rw-r--r--libempathy/empathy-tls-verifier.c59
1 files changed, 54 insertions, 5 deletions
diff --git a/libempathy/empathy-tls-verifier.c b/libempathy/empathy-tls-verifier.c
index f279efbfe..07beda63b 100644
--- a/libempathy/empathy-tls-verifier.c
+++ b/libempathy/empathy-tls-verifier.c
@@ -213,10 +213,39 @@ abort_verification (EmpathyTLSVerifier *self,
tp_clear_object (&priv->verify_result);
}
+static gchar *
+get_certified_hostname (gnutls_x509_crt_t cert)
+{
+ gchar dns_name[256];
+ gsize dns_name_size;
+ gint idx;
+ gint res = 0;
+
+ /* this is taken from GnuTLS */
+ for (idx = 0; res >= 0; idx++)
+ {
+ dns_name_size = sizeof (dns_name);
+ res = gnutls_x509_crt_get_subject_alt_name (cert, idx,
+ dns_name, &dns_name_size, NULL);
+
+ if (res == GNUTLS_SAN_DNSNAME || res == GNUTLS_SAN_IPADDRESS)
+ return g_strndup (dns_name, dns_name_size);
+ }
+
+ dns_name_size = sizeof (dns_name);
+ res = gnutls_x509_crt_get_dn_by_oid (cert, GNUTLS_OID_X520_COMMON_NAME,
+ 0, 0, dns_name, &dns_name_size);
+
+ if (res >= 0)
+ return g_strndup (dns_name, dns_name_size);
+
+ return NULL;
+}
+
static void
real_start_verification (EmpathyTLSVerifier *self)
{
- gnutls_x509_crt_t last_cert;
+ gnutls_x509_crt_t first_cert, last_cert;
gint idx;
gboolean res = FALSE;
gint num_certs;
@@ -224,14 +253,34 @@ real_start_verification (EmpathyTLSVerifier *self)
EMP_TLS_CERTIFICATE_REJECT_REASON_UNKNOWN;
EmpathyTLSVerifierPriv *priv = GET_PRIV (self);
- num_certs = priv->cert_chain->len;
-
DEBUG ("Starting verification");
+ /* check if the certificate matches the hostname first. */
+ first_cert = g_ptr_array_index (priv->cert_chain, 0);
+ if (gnutls_x509_crt_check_hostname (first_cert, priv->hostname) == 0)
+ {
+ gchar *certified_hostname;
+
+ certified_hostname = get_certified_hostname (first_cert);
+ DEBUG ("Hostname mismatch: got %s but expected %s",
+ certified_hostname, priv->hostname);
+
+ /* TODO: pass-through the expected hostname in the reject details */
+ reason = EMP_TLS_CERTIFICATE_REJECT_REASON_HOSTNAME_MISMATCH;
+
+ g_free (certified_hostname);
+ goto out;
+ }
+
+ DEBUG ("Hostname matched");
+
+ num_certs = priv->cert_chain->len;
+
if (priv->trusted_ca_list->len > 0)
{
- /* if the last certificate is self-signed, ignore it, as we want to check
- * the chain against our trusted CA list first.
+ /* if the last certificate is self-signed, and we have a list of
+ * trusted CAs, ignore it, as we want to check the chain against our
+ * trusted CAs list first.
*/
last_cert = g_ptr_array_index (priv->cert_chain, num_certs - 1);