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prop224: Remove INTRODUCE2 legacy handling

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Turns out that introduction points don't care about the INTRODUCE2 cell
format as long as the top field is LEGACY_KEY_ID as expected. So let's
use a single INTRODUCE format regardless of the introduction point being
legacy or not.

This also removes the polymorphic void* situation.

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2017-08-01 13:30:04 -04:00 committed by Nick Mathewson
parent ec0da9a6f1
commit 708789025d
3 changed files with 19 additions and 89 deletions
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105
src/or/hs_cell.c
View File

@ -208,100 +208,35 @@ build_legacy_establish_intro(const char *circ_nonce, crypto_pk_t *enc_key,
return cell_len;
}
/* Free the given cell pointer. If is_legacy_cell is set, cell_ptr is cast to
* a rend_intro_cell_t else to a trn_cell_introduce1_t. */
static void
introduce2_free_cell(void *cell_ptr, unsigned int is_legacy_cell)
{
if (cell_ptr == NULL) {
return;
}
if (is_legacy_cell) {
rend_intro_cell_t *legacy_cell = cell_ptr;
rend_service_free_intro(legacy_cell);
} else {
trn_cell_introduce1_free((trn_cell_introduce1_t *) cell_ptr);
}
}
/* Return the length of the encrypted section of the cell_ptr. If
* is_legacy_cell is set, cell_ptr is cast to a rend_intro_cell_t else to a
* trn_cell_introduce1_t. */
static size_t
get_introduce2_encrypted_section_len(const void *cell_ptr,
unsigned int is_legacy_cell)
{
tor_assert(cell_ptr);
if (is_legacy_cell) {
return ((const rend_intro_cell_t *) cell_ptr)->ciphertext_len;
}
return trn_cell_introduce1_getlen_encrypted(
(const trn_cell_introduce1_t *) cell_ptr);
}
/* Return the encrypted section pointer from the the cell_ptr. If
* is_legacy_cell is set, cell_ptr is cast to a rend_intro_cell_t else to a
* trn_cell_introduce1_t. */
static const uint8_t *
get_introduce2_encrypted_section(const void *cell_ptr,
unsigned int is_legacy_cell)
{
tor_assert(cell_ptr);
if (is_legacy_cell) {
return ((const rend_intro_cell_t *) cell_ptr)->ciphertext;
}
return trn_cell_introduce1_getconstarray_encrypted(
(const trn_cell_introduce1_t *) cell_ptr);
}
/* Parse an INTRODUCE2 cell from payload of size payload_len for the given
* service and circuit which are used only for logging purposes. The resulting
* parsed cell is put in cell_ptr_out. If is_legacy_cell is set, the type of
* the returned cell is rend_intro_cell_t else trn_cell_introduce1_t.
* parsed cell is put in cell_ptr_out.
*
* Return 0 on success else a negative value and cell_ptr_out is untouched. */
static int
parse_introduce2_cell(const hs_service_t *service,
const origin_circuit_t *circ, const uint8_t *payload,
size_t payload_len, unsigned int is_legacy_cell,
void **cell_ptr_out)
size_t payload_len,
trn_cell_introduce1_t **cell_ptr_out)
{
trn_cell_introduce1_t *cell = NULL;
tor_assert(service);
tor_assert(circ);
tor_assert(payload);
tor_assert(cell_ptr_out);
/* We parse the cell differently for legacy. */
if (is_legacy_cell) {
char *err_msg;
rend_intro_cell_t *legacy_cell = NULL;
legacy_cell = rend_service_begin_parse_intro(payload, payload_len, 2,
&err_msg);
if (legacy_cell == NULL) {
log_info(LD_REND, "Unable to parse legacy INTRODUCE2 cell on "
"circuit %u for service %s: %s",
TO_CIRCUIT(circ)->n_circ_id, err_msg,
safe_str_client(service->onion_address));
tor_free(err_msg);
goto err;
}
*cell_ptr_out = legacy_cell;
} else {
trn_cell_introduce1_t *cell = NULL;
/* Parse the cell so we can start cell validation. */
if (trn_cell_introduce1_parse(&cell, payload, payload_len) < 0) {
log_info(LD_PROTOCOL, "Unable to parse INTRODUCE2 cell on circuit %u "
"for service %s",
TO_CIRCUIT(circ)->n_circ_id,
safe_str_client(service->onion_address));
goto err;
}
*cell_ptr_out = cell;
/* Parse the cell so we can start cell validation. */
if (trn_cell_introduce1_parse(&cell, payload, payload_len) < 0) {
log_info(LD_PROTOCOL, "Unable to parse INTRODUCE2 cell on circuit %u "
"for service %s",
TO_CIRCUIT(circ)->n_circ_id,
safe_str_client(service->onion_address));
goto err;
}
/* On success, we must have set the cell pointer. */
tor_assert(*cell_ptr_out);
/* Success. */
*cell_ptr_out = cell;
return 0;
err:
return -1;
@ -465,9 +400,9 @@ hs_cell_parse_introduce2(hs_cell_introduce2_data_t *data,
uint8_t *decrypted = NULL;
size_t encrypted_section_len;
const uint8_t *encrypted_section;
trn_cell_introduce1_t *cell = NULL;
trn_cell_introduce_encrypted_t *enc_cell = NULL;
hs_ntor_intro_cell_keys_t *intro_keys = NULL;
void *cell_ptr = NULL;
tor_assert(data);
tor_assert(circ);
@ -475,7 +410,7 @@ hs_cell_parse_introduce2(hs_cell_introduce2_data_t *data,
/* Parse the cell into a decoded data structure pointed by cell_ptr. */
if (parse_introduce2_cell(service, circ, data->payload, data->payload_len,
data->is_legacy, &cell_ptr) < 0) {
&cell) < 0) {
goto done;
}
@ -484,10 +419,8 @@ hs_cell_parse_introduce2(hs_cell_introduce2_data_t *data,
TO_CIRCUIT(circ)->n_circ_id,
safe_str_client(service->onion_address));
encrypted_section =
get_introduce2_encrypted_section(cell_ptr, data->is_legacy);
encrypted_section_len =
get_introduce2_encrypted_section_len(cell_ptr, data->is_legacy);
encrypted_section = trn_cell_introduce1_getconstarray_encrypted(cell);
encrypted_section_len = trn_cell_introduce1_getlen_encrypted(cell);
/* Encrypted section must at least contain the CLIENT_PK and MAC which is
* defined in section 3.3.2 of the specification. */
@ -603,7 +536,7 @@ hs_cell_parse_introduce2(hs_cell_introduce2_data_t *data,
}
tor_free(decrypted);
trn_cell_introduce_encrypted_free(enc_cell);
introduce2_free_cell(cell_ptr, data->is_legacy);
trn_cell_introduce1_free(cell);
return ret;
}

2
src/or/hs_cell.h
View File

@ -34,8 +34,6 @@ typedef struct hs_cell_introduce2_data_t {
const uint8_t *payload;
/* Size of the payload of the received encoded cell. */
size_t payload_len;
/* Is this a legacy introduction point? */
unsigned int is_legacy : 1;
/*** Muttable Section. ***/

1
src/or/hs_circuit.c
View File

@ -945,7 +945,6 @@ hs_circ_handle_introduce2(const hs_service_t *service,
data.payload = payload;
data.payload_len = payload_len;
data.link_specifiers = smartlist_new();
data.is_legacy = ip->base.is_only_legacy;
data.replay_cache = ip->replay_cache;
if (hs_cell_parse_introduce2(&data, circ, service) < 0) {