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