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Add an exported struct to onion handshakes for circuits params

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THis will eventually hold the congestion control parameters that we
negotiated, plus whatever else is relevant.
This commit is contained in:
Nick Mathewson 2021-09-14 15:15:30 -04:00 committed by Mike Perry
parent 358ce9a19d
commit 244444e8b1
5 changed files with 35 additions and 4 deletions
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7
src/core/crypto/onion_crypto.c
View File

@ -183,9 +183,11 @@ onion_skin_server_handshake(int type,
uint8_t *reply_out,
size_t reply_out_maxlen,
uint8_t *keys_out, size_t keys_out_len,
uint8_t *rend_nonce_out)
uint8_t *rend_nonce_out,
circuit_params_t *params_out)
{
int r = -1;
memset(params_out, 0, sizeof(*params_out)); // TODO: actually set.
switch (type) {
case ONION_HANDSHAKE_TYPE_TAP:
@ -262,11 +264,14 @@ onion_skin_client_handshake(int type,
const uint8_t *reply, size_t reply_len,
uint8_t *keys_out, size_t keys_out_len,
uint8_t *rend_authenticator_out,
circuit_params_t *params_out,
const char **msg_out)
{
if (handshake_state->tag != type)
return -1;
memset(params_out, 0, sizeof(*params_out)); // TODO: actually set.
switch (type) {
case ONION_HANDSHAKE_TYPE_TAP:
if (reply_len != TAP_ONIONSKIN_REPLY_LEN) {

14
src/core/crypto/onion_crypto.h
View File

@ -22,6 +22,16 @@ typedef struct server_onion_keys_t {
void onion_handshake_state_release(onion_handshake_state_t *state);
/**
* Parameters negotiated as part of a circuit handshake.
*/
typedef struct circuit_params_t {
/* placeholder field for congestion control algorithm. Right now this
* is always set to zero */
int cc_algorithm;
int cc_window;
} circuit_params_t;
int onion_skin_create(int type,
const extend_info_t *node,
onion_handshake_state_t *state_out,
@ -33,12 +43,14 @@ int onion_skin_server_handshake(int type,
uint8_t *reply_out,
size_t reply_out_maxlen,
uint8_t *keys_out, size_t key_out_len,
uint8_t *rend_nonce_out);
uint8_t *rend_nonce_out,
circuit_params_t *negotiated_params_out);
int onion_skin_client_handshake(int type,
const onion_handshake_state_t *handshake_state,
const uint8_t *reply, size_t reply_len,
uint8_t *keys_out, size_t key_out_len,
uint8_t *rend_authenticator_out,
circuit_params_t *negotiated_params_out,
const char **msg_out);
server_onion_keys_t *server_onion_keys_new(void);

7
src/core/mainloop/cpuworker.c
View File

@ -416,6 +416,7 @@ cpuworker_onion_handshake_threadfn(void *state_, void *work_)
const create_cell_t *cc = &req.create_cell;
created_cell_t *cell_out = &rpl.created_cell;
struct timeval tv_start = {0,0}, tv_end;
circuit_params_t params;
int n;
rpl.timed = req.timed;
rpl.started_at = req.started_at;
@ -428,7 +429,8 @@ cpuworker_onion_handshake_threadfn(void *state_, void *work_)
cell_out->reply,
sizeof(cell_out->reply),
rpl.keys, CPATH_KEY_MATERIAL_LEN,
rpl.rend_auth_material);
rpl.rend_auth_material,
&params);
if (n < 0) {
/* failure */
log_debug(LD_OR,"onion_skin_server_handshake failed.");
@ -451,6 +453,9 @@ cpuworker_onion_handshake_threadfn(void *state_, void *work_)
}
rpl.success = 1;
}
// TODO: pass the parameters back up so we can initialize the cc paremeters.
rpl.magic = CPUWORKER_REPLY_MAGIC;
if (req.timed) {
struct timeval tv_diff;

4
src/core/or/circuitbuild.c
View File

@ -1242,6 +1242,7 @@ circuit_finish_handshake(origin_circuit_t *circ,
}
tor_assert(hop->state == CPATH_STATE_AWAITING_KEYS);
circuit_params_t params;
{
const char *msg = NULL;
if (onion_skin_client_handshake(hop->handshake_state.tag,
@ -1249,6 +1250,7 @@ circuit_finish_handshake(origin_circuit_t *circ,
reply->reply, reply->handshake_len,
(uint8_t*)keys, sizeof(keys),
(uint8_t*)hop->rend_circ_nonce,
&params,
&msg) < 0) {
if (msg)
log_warn(LD_CIRC,"onion_skin_client_handshake failed: %s", msg);
@ -1258,6 +1260,8 @@ circuit_finish_handshake(origin_circuit_t *circ,
onion_handshake_state_release(&hop->handshake_state);
// XXXX TODO: use `params` to initialize the congestion control.
if (cpath_init_circuit_crypto(hop, keys, sizeof(keys), 0, 0)<0) {
return -END_CIRC_REASON_TORPROTOCOL;
}

7
src/core/or/command.c
View File

@ -360,6 +360,7 @@ command_process_create_cell(cell_t *cell, channel_t *chan)
uint8_t rend_circ_nonce[DIGEST_LEN];
int len;
created_cell_t created_cell;
circuit_params_t params;
memset(&created_cell, 0, sizeof(created_cell));
len = onion_skin_server_handshake(ONION_HANDSHAKE_TYPE_FAST,
@ -369,7 +370,8 @@ command_process_create_cell(cell_t *cell, channel_t *chan)
created_cell.reply,
sizeof(created_cell.reply),
keys, CPATH_KEY_MATERIAL_LEN,
rend_circ_nonce);
rend_circ_nonce,
&params);
tor_free(create_cell);
if (len < 0) {
log_warn(LD_OR,"Failed to generate key material. Closing.");
@ -379,6 +381,9 @@ command_process_create_cell(cell_t *cell, channel_t *chan)
created_cell.cell_type = CELL_CREATED_FAST;
created_cell.handshake_len = len;
// TODO: We should in theory look at params here, though it will always
// tell us to use the old-fashioned congestion control.
if (onionskin_answer(circ, &created_cell,
(const char *)keys, sizeof(keys),
rend_circ_nonce)<0) {