Merge branch 'bug24978_029_enable' into maint-0.2.9

changes/bug24978

@@ -0,0 +1,7 @@
+  o Minor features (compatibility, OpenSSL):
+    - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
+      Previous versions of Tor would not have worked with OpenSSL
+      1.1.1, since they neither disabled TLS 1.3 nor enabled any of the
+      ciphersuites it requires. Here we enable the TLS 1.3 ciphersuites.
+      Closes ticket 24978.
+

src/common/ciphers.inc

@@ -2,8 +2,27 @@
  * advertise.  Before including it, you should define the CIPHER and XCIPHER
  * macros.
  *
- * This file was automatically generated by get_mozilla_ciphers.py.
+ * This file was automatically generated by get_mozilla_ciphers.py;
+ * TLSv1.3 ciphers were added manually.
  */
+
+/* Here are the TLS1.3 ciphers. Note that we don't have XCIPHER instances
+ * here, since we don't want to ever fake them.
+ */
+#ifdef TLS1_3_TXT_AES_128_GCM_SHA256
+   CIPHER(0x1301, TLS1_3_TXT_AES_128_GCM_SHA256)
+#endif
+#ifdef TLS1_3_TXT_AES_256_GCM_SHA384
+   CIPHER(0x1302, TLS1_3_TXT_AES_256_GCM_SHA384)
+#endif
+#ifdef TLS1_3_TXT_CHACHA20_POLY1305_SHA256
+   CIPHER(0x1303, TLS1_3_TXT_CHACHA20_POLY1305_SHA256)
+#endif
+#ifdef TLS1_3_TXT_AES_128_CCM_SHA256
+   CIPHER(0x1304, TLS1_3_TXT_AES_128_CCM_SHA256)
+#endif
+
+/* Here's the machine-generated list. */
 #ifdef TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
     CIPHER(0xc02b, TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
 #else

src/common/tortls.c

@@ -550,13 +550,35 @@ MOCK_IMPL(STATIC X509 *,
 
 /** List of ciphers that servers should select from when the client might be
  * claiming extra unsupported ciphers in order to avoid fingerprinting.  */
-#define SERVER_CIPHER_LIST                         \
-  (TLS1_TXT_DHE_RSA_WITH_AES_256_SHA ":"           \
-   TLS1_TXT_DHE_RSA_WITH_AES_128_SHA)
+static const char SERVER_CIPHER_LIST[] =
+#ifdef  TLS1_3_TXT_AES_128_GCM_SHA256
+  /* This one can never actually get selected, since if the client lists it,
+   * we will assume that the client is honest, and not use this list.
+   * Nonetheless we list it if it's available, so that the server doesn't
+   * conclude that it has no valid ciphers if it's running with TLS1.3.
+   */
+  TLS1_3_TXT_AES_128_GCM_SHA256 ":"
+#endif
+  TLS1_TXT_DHE_RSA_WITH_AES_256_SHA ":"
+  TLS1_TXT_DHE_RSA_WITH_AES_128_SHA;
 
 /** List of ciphers that servers should select from when we actually have
  * our choice of what cipher to use. */
 static const char UNRESTRICTED_SERVER_CIPHER_LIST[] =
+  /* Here are the TLS 1.3 ciphers we like, in the order we prefer. */
+#ifdef TLS1_3_TXT_AES_256_GCM_SHA384
+  TLS1_3_TXT_AES_256_GCM_SHA384 ":"
+#endif
+#ifdef TLS1_3_TXT_CHACHA20_POLY1305_SHA256
+  TLS1_3_TXT_CHACHA20_POLY1305_SHA256 ":"
+#endif
+#ifdef TLS1_3_TXT_AES_128_GCM_SHA256
+  TLS1_3_TXT_AES_128_GCM_SHA256 ":"
+#endif
+#ifdef TLS1_3_TXT_AES_128_CCM_SHA256
+  TLS1_3_TXT_AES_128_CCM_SHA256 ":"
+#endif
+
   /* This list is autogenerated with the gen_server_ciphers.py script;
    * don't hand-edit it. */
 #ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_256_GCM_SHA384