Rename aead-tag-at-end to aead-epoch

Change-Id: I9e9433b56dcbaa538d9bed30e50cf74948c647cc Signed-off-by: Arne Schwabe <[email protected]>
schwabe · Oct 17, 2024 · 34aaafd · 34aaafd
1 parent 0fca20e
commit 34aaafd
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Showing 7 changed files with 17 additions and 13 deletions.
diff --git a/src/openvpn/crypto.c b/src/openvpn/crypto.c
@@ -128,7 +128,7 @@ openvpn_encrypt_aead(struct buffer *buf, struct buffer work,
     dmsg(D_PACKET_CONTENT, "ENCRYPT AD: %s",
          format_hex(BPTR(&work), BLEN(&work), 0, &gc));
 
-    if (!(opt->flags & CO_AEAD_TAG_AT_THE_END))
+    if (!(opt->flags & CO_EPOCH_DATA_KEY_FORMAT))
     {
         /* Reserve space for authentication tag */
         mac_out = buf_write_alloc(&work, mac_len);
@@ -149,7 +149,7 @@ openvpn_encrypt_aead(struct buffer *buf, struct buffer work,
     ASSERT(buf_inc_len(&work, outlen));
 
     /* if the tag is at end the end, allocate it now */
-    if (opt->flags & CO_AEAD_TAG_AT_THE_END)
+    if (opt->flags & CO_EPOCH_DATA_KEY_FORMAT)
     {
         /* Reserve space for authentication tag */
         mac_out = buf_write_alloc(&work, mac_len);
@@ -475,7 +475,7 @@ openvpn_decrypt_aead(struct buffer *buf, struct buffer work,
     uint8_t *tag_ptr = NULL;
     int data_len = 0;
 
-    if (opt->flags & CO_AEAD_TAG_AT_THE_END)
+    if (opt->flags & CO_EPOCH_DATA_KEY_FORMAT)
     {
         data_len = BLEN(buf) - tag_size;
         tag_ptr = BPTR(buf) + data_len;

diff --git a/src/openvpn/crypto.h b/src/openvpn/crypto.h
@@ -320,9 +320,10 @@ struct crypto_options
     /**< Bit-flag indicating that renegotiations are using tls-crypt
      *   with a TLS-EKM derived key.
      */
-#define CO_AEAD_TAG_AT_THE_END  (1<<8)
-    /**< Bit-flag indicating that the AEAD tag is at the end of the
-     *   packet.
+#define CO_EPOCH_DATA_KEY_FORMAT  (1<<8)
+    /**< Bit-flag indicating that the data format using
+     * AEAD tag is at the end of the  packet and using epoch
+     * keys is used.
      */
 
     unsigned int flags;         /**< Bit-flags determining behavior of

diff --git a/src/openvpn/init.c b/src/openvpn/init.c
@@ -2392,9 +2392,9 @@ tls_print_deferred_options_results(struct context *c)
         {
             buf_printf(&out, " dyn-tls-crypt");
         }
-        if (o->imported_protocol_flags & CO_AEAD_TAG_AT_THE_END)
+        if (o->imported_protocol_flags & CO_EPOCH_DATA_KEY_FORMAT)
         {
-            buf_printf(&out, " aead-tag-end");
+            buf_printf(&out, " aead-epoch");
         }
     }
 

diff --git a/src/openvpn/options.c b/src/openvpn/options.c
@@ -8719,9 +8719,9 @@ add_option(struct options *options,
                 options->imported_protocol_flags |= CO_USE_DYNAMIC_TLS_CRYPT;
             }
 #endif
-            else if (streq(p[j], "aead-tag-end"))
+            else if (streq(p[j], "aead-epoch"))
             {
-                options->imported_protocol_flags |= CO_AEAD_TAG_AT_THE_END;
+                options->imported_protocol_flags |= CO_EPOCH_DATA_KEY_FORMAT;
             }
             else
             {

diff --git a/src/openvpn/push.c b/src/openvpn/push.c
@@ -689,9 +689,9 @@ prepare_push_reply(struct context *c, struct gc_arena *gc,
         buf_printf(&proto_flags, " dyn-tls-crypt");
     }
 
-    if (o->imported_protocol_flags & CO_AEAD_TAG_AT_THE_END)
+    if (o->imported_protocol_flags & CO_EPOCH_DATA_KEY_FORMAT)
     {
-        buf_printf(&proto_flags, " aead-tag-end");
+        buf_printf(&proto_flags, " aead-epoch");
     }
 
     if (buf_len(&proto_flags) > 0)

diff --git a/src/openvpn/ssl.h b/src/openvpn/ssl.h
@@ -107,6 +107,9 @@
 /** Support to dynamic tls-crypt (renegotiation with TLS-EKM derived tls-crypt key) */
 #define IV_PROTO_DYN_TLS_CRYPT   (1<<9)
 
+/** Support the extended packet id and epoch format for data channel packets */
+#define IV_PROTO_DATA_EPOCH      (1<<10)
+
 /** Supports the --dns option after all the incompatible changes */
 #define IV_PROTO_DNS_OPTION_V2   (1<<11)
 

diff --git a/tests/unit_tests/openvpn/test_ssl.c b/tests/unit_tests/openvpn/test_ssl.c
@@ -404,7 +404,7 @@ static void
 run_data_channel_with_cipher_end(const char *cipher)
 {
     struct crypto_options co = init_crypto_options(cipher, "none");
-    co.flags |= CO_AEAD_TAG_AT_THE_END;
+    co.flags |= CO_EPOCH_DATA_KEY_FORMAT;
     do_data_channel_round_trip(&co);
     uninit_crypto_options(&co);
 }