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@@ -207,6 +207,105 @@ build_legacy_establish_intro(const char *circ_nonce, crypto_pk_t *enc_key,
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return cell_len;
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}
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+/* Free the given cell pointer. If is_legacy_cell is set, cell_ptr is cast to
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+ * a rend_intro_cell_t else to a trn_cell_introduce1_t. */
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+static void
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+introduce2_free_cell(void *cell_ptr, unsigned int is_legacy_cell)
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+{
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+ if (cell_ptr == NULL) {
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+ return;
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+ }
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+ if (is_legacy_cell) {
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+ rend_intro_cell_t *legacy_cell = cell_ptr;
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+ rend_service_free_intro(legacy_cell);
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+ } else {
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+ trn_cell_introduce1_free((trn_cell_introduce1_t *) cell_ptr);
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+ }
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+}
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+
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+/* Return the length of the encrypted section of the cell_ptr. If
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+ * is_legacy_cell is set, cell_ptr is cast to a rend_intro_cell_t else to a
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+ * trn_cell_introduce1_t. */
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+static size_t
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+get_introduce2_encrypted_section_len(const void *cell_ptr,
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+ unsigned int is_legacy_cell)
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+{
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+ tor_assert(cell_ptr);
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+ if (is_legacy_cell) {
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+ return ((const rend_intro_cell_t *) cell_ptr)->ciphertext_len;
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+ }
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+ return trn_cell_introduce1_getlen_encrypted(
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+ (const trn_cell_introduce1_t *) cell_ptr);
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+}
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+
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+/* Return the encrypted section pointer from the the cell_ptr. If
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+ * is_legacy_cell is set, cell_ptr is cast to a rend_intro_cell_t else to a
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+ * trn_cell_introduce1_t. */
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+static const uint8_t *
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+get_introduce2_encrypted_section(const void *cell_ptr,
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+ unsigned int is_legacy_cell)
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+{
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+ tor_assert(cell_ptr);
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+ if (is_legacy_cell) {
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+ return ((const rend_intro_cell_t *) cell_ptr)->ciphertext;
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+ }
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+ return trn_cell_introduce1_getconstarray_encrypted(
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+ (const trn_cell_introduce1_t *) cell_ptr);
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+}
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+
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+/* Parse an INTRODUCE2 cell from payload of size payload_len for the given
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+ * service and circuit which are used only for logging purposes. The resulting
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+ * parsed cell is put in cell_ptr_out. If is_legacy_cell is set, the type of
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+ * the returned cell is rend_intro_cell_t else trn_cell_introduce1_t.
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+ *
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+ * Return 0 on success else a negative value and cell_ptr_out is untouched. */
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+static int
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+parse_introduce2_cell(const hs_service_t *service,
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+ const origin_circuit_t *circ, const uint8_t *payload,
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+ size_t payload_len, unsigned int is_legacy_cell,
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+ void **cell_ptr_out)
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+{
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+ tor_assert(service);
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+ tor_assert(circ);
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+ tor_assert(payload);
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+ tor_assert(cell_ptr_out);
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+
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+ /* We parse the cell differently for legacy. */
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+ if (is_legacy_cell) {
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+ char *err_msg;
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+ rend_intro_cell_t *legacy_cell = NULL;
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+
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+ legacy_cell = rend_service_begin_parse_intro(payload, payload_len, 2,
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+ &err_msg);
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+ if (legacy_cell == NULL) {
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+ log_info(LD_REND, "Unable to parse legacy INTRODUCE2 cell on "
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+ "circuit %u for service %s: %s",
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+ TO_CIRCUIT(circ)->n_circ_id, err_msg,
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+ safe_str_client(service->onion_address));
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+ tor_free(err_msg);
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+ goto err;
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+ }
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+ *cell_ptr_out = legacy_cell;
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+ } else {
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+ trn_cell_introduce1_t *cell = NULL;
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+ /* Parse the cell so we can start cell validation. */
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+ if (trn_cell_introduce1_parse(&cell, payload, payload_len) < 0) {
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+ log_info(LD_PROTOCOL, "Unable to parse INTRODUCE2 cell on circuit %u "
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+ "for service %s",
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+ TO_CIRCUIT(circ)->n_circ_id,
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+ safe_str_client(service->onion_address));
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+ goto err;
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+ }
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+ *cell_ptr_out = cell;
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+ }
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+
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+ /* On success, we must have set the cell pointer. */
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+ tor_assert(*cell_ptr_out);
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+ return 0;
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+ err:
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+ return -1;
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+}
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+
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/* ========== */
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/* Public API */
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/* ========== */
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@@ -364,21 +463,17 @@ hs_cell_parse_introduce2(hs_cell_introduce2_data_t *data,
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uint8_t *decrypted = NULL;
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size_t encrypted_section_len;
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const uint8_t *encrypted_section;
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- trn_cell_introduce1_t *cell = NULL;
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trn_cell_introduce_encrypted_t *enc_cell = NULL;
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hs_ntor_intro_cell_keys_t *intro_keys = NULL;
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+ void *cell_ptr = NULL;
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tor_assert(data);
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tor_assert(circ);
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tor_assert(service);
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- /* Parse the cell so we can start cell validation. */
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- if (trn_cell_introduce1_parse(&cell, data->payload,
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- data->payload_len) < 0) {
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- log_info(LD_PROTOCOL, "Unable to parse INTRODUCE2 cell on circuit %u "
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- "for service %s",
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- TO_CIRCUIT(circ)->n_circ_id,
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- safe_str_client(service->onion_address));
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+ /* Parse the cell into a decoded data structure pointed by cell_ptr. */
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+ if (parse_introduce2_cell(service, circ, data->payload, data->payload_len,
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+ data->is_legacy, &cell_ptr) < 0) {
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goto done;
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}
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@@ -389,8 +484,10 @@ hs_cell_parse_introduce2(hs_cell_introduce2_data_t *data,
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TO_CIRCUIT(circ)->n_circ_id,
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safe_str_client(service->onion_address));
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- encrypted_section = trn_cell_introduce1_getconstarray_encrypted(cell);
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- encrypted_section_len = trn_cell_introduce1_getlen_encrypted(cell);
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+ encrypted_section =
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+ get_introduce2_encrypted_section(cell_ptr, data->is_legacy);
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+ encrypted_section_len =
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+ get_introduce2_encrypted_section_len(cell_ptr, data->is_legacy);
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/* Encrypted section must at least contain the CLIENT_PK and MAC which is
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* defined in section 3.3.2 of the specification. */
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@@ -496,8 +593,8 @@ hs_cell_parse_introduce2(hs_cell_introduce2_data_t *data,
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tor_free(intro_keys);
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}
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tor_free(decrypted);
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- trn_cell_introduce1_free(cell);
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trn_cell_introduce_encrypted_free(enc_cell);
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+ introduce2_free_cell(cell_ptr, data->is_legacy);
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return ret;
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}
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