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--- a/modules/ssl/ssl_engine_kernel.c 2015/06/09 15:55:41 1684461
+++ b/modules/ssl/ssl_engine_kernel.c 2015/06/09 16:09:28 1684462
@@ -1940,7 +1940,7 @@
#ifndef OPENSSL_NO_TLSEXT
/*
* This callback function is executed when OpenSSL encounters an extended
- * client hello with a server name indication extension ("SNI", cf. RFC 4366).
+ * client hello with a server name indication extension ("SNI", cf. RFC 6066).
*/
int ssl_callback_ServerNameIndication(SSL *ssl, int *al, modssl_ctx_t *mctx)
{
@@ -1962,7 +1962,21 @@
"No matching SSL virtual host for servername "
"%s found (using default/first virtual host)",
servername);
- return SSL_TLSEXT_ERR_ALERT_WARNING;
+ /*
+ * RFC 6066 section 3 says "It is NOT RECOMMENDED to send
+ * a warning-level unrecognized_name(112) alert, because
+ * the client's behavior in response to warning-level alerts
+ * is unpredictable."
+ *
+ * To maintain backwards compatibility in mod_ssl, we
+ * no longer send any alert (neither warning- nor fatal-level),
+ * i.e. we take the second action suggested in RFC 6066:
+ * "If the server understood the ClientHello extension but
+ * does not recognize the server name, the server SHOULD take
+ * one of two actions: either abort the handshake by sending
+ * a fatal-level unrecognized_name(112) alert or continue
+ * the handshake."
+ */
}
}
}