Parse Signature Algorithm ext when renegotiating
Signature algorithm extension was skipped when renegotiation was in
progress, causing the signature algorithm not to be known when
renegotiating, and failing the handshake. Fix removes the renegotiation
step check before parsing the extension.
diff --git a/ChangeLog b/ChangeLog
index 42cbf6c..3e74dce 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,9 @@
* Fix memory leak in mbedtls_ssl_set_hostname() when called multiple times.
Found by projectgus and jethrogb, #836.
* Fix usage help in ssl_server2 example. Found and fixed by Bei Lin.
+ * Parse signature algorithm extension when renegotiating. Previously,
+ renegotiated handshakes would only accept signatures using SHA-1
+ regardless of the peer's preferences, or fail if SHA-1 was disabled.
= mbed TLS 2.1.9 branch released 2017-08-10
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index 01b4ada..1002adf 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -1603,11 +1603,8 @@
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
case MBEDTLS_TLS_EXT_SIG_ALG:
- MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) );
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
- if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
- break;
-#endif
+ MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) );
+
ret = ssl_parse_signature_algorithms_ext( ssl, ext + 4, ext_size );
if( ret != 0 )
return( ret );