Implement client side of TLS signed certificate stamps extension.
https://crbug.com/389420 and 3.3 in rfc6962.
Change-Id: Ib22bcd4e4bde5a314ed33e123e19a76cdb714da4
Reviewed-on: https://boringssl-review.googlesource.com/1491
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 855d1d0..d23b41e 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -1109,6 +1109,16 @@
}
#endif
+ if (s->signed_cert_timestamps_enabled && !s->s3->tmp.finish_md_len)
+ {
+ /* The client advertises an empty extension to indicate its support for
+ * certificate timestamps. */
+ if (limit - ret - 4 < 0)
+ return NULL;
+ s2n(TLSEXT_TYPE_certificate_timestamp,ret);
+ s2n(0,ret);
+ }
+
if (s->alpn_client_proto_list && !s->s3->tmp.finish_md_len)
{
if ((size_t)(limit - ret) < 6 + s->alpn_client_proto_list_len)
@@ -2234,7 +2244,26 @@
s->s3->tlsext_channel_id_valid = 1;
s->s3->tlsext_channel_id_new = 1;
}
+ else if (type == TLSEXT_TYPE_certificate_timestamp)
+ {
+ if (CBS_len(&extension) == 0)
+ {
+ *out_alert = SSL_AD_DECODE_ERROR;
+ return 0;
+ }
+ /* Session resumption uses the original session information. */
+ if (!s->hit)
+ {
+ if (!CBS_stow(&extension,
+ &s->session->tlsext_signed_cert_timestamp_list,
+ &s->session->tlsext_signed_cert_timestamp_list_length))
+ {
+ *out_alert = SSL_AD_INTERNAL_ERROR;
+ return 0;
+ }
+ }
+ }
else if (type == TLSEXT_TYPE_renegotiate)
{
if (!ssl_parse_serverhello_renegotiate_ext(s, &extension, out_alert))
