@@ -22,6 +22,53 @@
#include "ustream-ssl.h"
#include "ustream-internal.h"
+
+/* Ciphersuite preference:
+ * - key exchange: prefer ECDHE, then DHE(client only), then RSA
+ * - prefer AEAD ciphers:
+ * chacha20-poly1305, the fastest in software, 256-bits
+ * aes128-gcm, 128-bits
+ * aes256-gcm, 256-bits
+ * - CBC ciphers
+ * aes128, aes256, 3DES(client only)
+ */
+
+#define ecdhe_ciphers \
+ "ECDHE-ECDSA-CHACHA20-POLY1305:" \
+ "ECDHE-ECDSA-AES128-GCM-SHA256:" \
+ "ECDHE-ECDSA-AES256-GCM-SHA384:" \
+ "ECDHE-ECDSA-AES128-SHA:" \
+ "ECDHE-ECDSA-AES256-SHA:" \
+ "ECDHE-RSA-CHACHA20-POLY1305:" \
+ "ECDHE-RSA-AES128-GCM-SHA256:" \
+ "ECDHE-RSA-AES256-GCM-SHA384:" \
+ "ECDHE-RSA-AES128-SHA:" \
+ "ECDHE-RSA-AES256-SHA"
+
+#define dhe_ciphers \
+ "DHE-RSA-CHACHA20-POLY1305:" \
+ "DHE-RSA-AES128-GCM-SHA256:" \
+ "DHE-RSA-AES256-GCM-SHA384:" \
+ "DHE-RSA-AES128-SHA:" \
+ "DHE-RSA-AES256-SHA:" \
+ "DHE-DES-CBC3-SHA"
+
+#define non_pfs_aes \
+ "AES128-GCM-SHA256:" \
+ "AES256-GCM-SHA384:" \
+ "AES128-SHA:" \
+ "AES256-SHA"
+
+#define server_cipher_list \
+ ecdhe_ciphers ":" \
+ non_pfs_aes
+
+#define client_cipher_list \
+ ecdhe_ciphers ":" \
+ dhe_ciphers ":" \
+ non_pfs_aes ":" \
+ "DES-CBC3-SHA"
+
__hidden struct ustream_ssl_ctx *
__ustream_ssl_context_new(bool server)
{
@@ -36,7 +83,7 @@ __ustream_ssl_context_new(bool server)
SSL_library_init();
_init = true;
}
-# define TLS_server_method SSLv23_server_method
+# define TLS_server_method TLSv1_2_server_method
# define TLS_client_method SSLv23_client_method
#endif
@@ -50,17 +97,18 @@ __ustream_ssl_context_new(bool server)
return NULL;
SSL_CTX_set_verify(c, SSL_VERIFY_NONE, NULL);
- SSL_CTX_set_options (c, SSL_OP_NO_COMPRESSION); /* avoid CRIME attack */
+ SSL_CTX_set_options(c, SSL_OP_NO_COMPRESSION | SSL_OP_SINGLE_ECDH_USE |
+ SSL_OP_CIPHER_SERVER_PREFERENCE);
#if !defined(OPENSSL_NO_ECDH) && !defined(CYASSL_OPENSSL_H_) && OPENSSL_VERSION_NUMBER < 0x10100000L
SSL_CTX_set_ecdh_auto(c, 1);
#endif
if (server) {
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
SSL_CTX_set_min_proto_version(c, TLS1_2_VERSION);
-#else
- SSL_CTX_set_options (c, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1);
#endif
- SSL_CTX_set_cipher_list(c, "DEFAULT:!RC4:@STRENGTH");
+ SSL_CTX_set_cipher_list(c, server_cipher_list);
+ } else {
+ SSL_CTX_set_cipher_list(c, client_cipher_list);
}
SSL_CTX_set_quiet_shutdown(c, 1);
The sender domain has a DMARC Reject/Quarantine policy which disallows sending mailing list messages using the original "From" header. To mitigate this problem, the original message has been wrapped automatically by the mailing list software. I've revised the security options, and made them more uniform across the ssl libraries. - disabled TLS compression, because of CRIME attack - enabled server-side ordering of cipher suites - use only TLS 1.2 in server mode for wolfssl - changed the ciphersuite ordering Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com> --- ustream-openssl.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 53 insertions(+), 5 deletions(-)