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Teach cpuworker and others about create_cell_t and friends

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The unit of work sent to a cpuworker is now a create_cell_t; its
response is now a created_cell_t.  Several of the things that call or
get called by this chain of logic now take create_cell_t or
created_cell_t too.

Since all cpuworkers are forked or spawned by Tor, they don't need a
stable wire protocol, so we can just send structs.  This saves us some
insanity, and helps p
This commit is contained in:
Nick Mathewson 2012-12-05 22:34:49 -05:00
parent 5d15d597a9
commit 2802ccaeb6
9 changed files with 233 additions and 163 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
src/or/circuitbuild.c
View File

@ -1359,7 +1359,7 @@ entry_guard_inc_first_hop_count(entry_guard_t *guard)
}
/** A created or extended cell came back to us on the circuit, and it included
* <b>reply</b> as its body. (If <b>reply_type</b> is CELL_CREATED, the body
* reply_cell as its body. (If <b>reply_type</b> is CELL_CREATED, the body
* contains (the second DH key, plus KH). If <b>reply_type</b> is
* CELL_CREATED_FAST, the body contains a secret y and a hash H(x|y).)
*
@ -1369,8 +1369,8 @@ entry_guard_inc_first_hop_count(entry_guard_t *guard)
* Return - reason if we want to mark circ for close, else return 0.
*/
int
circuit_finish_handshake(origin_circuit_t *circ, uint8_t reply_type,
const uint8_t *reply)
circuit_finish_handshake(origin_circuit_t *circ,
const created_cell_t *reply)
{
char keys[CPATH_KEY_MATERIAL_LEN];
crypt_path_t *hop;
@ -1391,23 +1391,9 @@ circuit_finish_handshake(origin_circuit_t *circ, uint8_t reply_type,
tor_assert(hop->state == CPATH_STATE_AWAITING_KEYS);
{
uint16_t handshake_type = 0xffff;
if (reply_type == CELL_CREATED)
handshake_type = ONION_HANDSHAKE_TYPE_TAP;
else if (reply_type == CELL_CREATED_FAST)
handshake_type = ONION_HANDSHAKE_TYPE_FAST;
if (handshake_type != hop->handshake_state.tag) {
log_warn(LD_PROTOCOL,"CREATED cell onionskin type (%u) did not "
"match CREATE cell onionskin type (%u).",
(unsigned)handshake_type,
(unsigned) hop->handshake_state.tag);
return -END_CIRC_REASON_TORPROTOCOL;
}
if (onion_skin_client_handshake(handshake_type,
if (onion_skin_client_handshake(hop->handshake_state.tag,
&hop->handshake_state,
reply,
reply->reply, reply->handshake_len,
(uint8_t*)keys, sizeof(keys),
(uint8_t*)hop->rend_circ_nonce) < 0) {
log_warn(LD_CIRC,"onion_skin_client_handshake failed.");
@ -1422,8 +1408,7 @@ circuit_finish_handshake(origin_circuit_t *circ, uint8_t reply_type,
}
hop->state = CPATH_STATE_OPEN;
log_info(LD_CIRC,"Finished building %scircuit hop:",
(reply_type == CELL_CREATED_FAST) ? "fast " : "");
log_info(LD_CIRC,"Finished building circuit hop:");
circuit_log_path(LOG_INFO,LD_CIRC,circ);
control_event_circuit_status(circ, CIRC_EVENT_EXTENDED, 0);
@ -1484,7 +1469,8 @@ circuit_truncated(origin_circuit_t *circ, crypt_path_t *layer, int reason)
*/
int
onionskin_answer(or_circuit_t *circ, uint8_t cell_type, const char *payload,
size_t payload_len, const char *keys)
size_t payload_len, const char *keys,
const uint8_t *rend_circ_nonce)
{
cell_t cell;
crypt_path_t *tmp_cpath;
@ -1515,11 +1501,7 @@ onionskin_answer(or_circuit_t *circ, uint8_t cell_type, const char *payload,
tmp_cpath->magic = 0;
tor_free(tmp_cpath);
/* XXXX Move responsibility for extracting this. */
if (cell_type == CELL_CREATED)
memcpy(circ->rend_circ_nonce, cell.payload+DH_KEY_LEN, DIGEST_LEN);
else
memcpy(circ->rend_circ_nonce, cell.payload+DIGEST_LEN, DIGEST_LEN);
memcpy(circ->rend_circ_nonce, rend_circ_nonce, DIGEST_LEN);
circ->is_first_hop = (cell_type == CELL_CREATED_FAST);

8
src/or/circuitbuild.h
View File

@ -30,13 +30,15 @@ void circuit_note_clock_jumped(int seconds_elapsed);
int circuit_extend(cell_t *cell, circuit_t *circ);
int circuit_init_cpath_crypto(crypt_path_t *cpath, const char *key_data,
int reverse);
int circuit_finish_handshake(origin_circuit_t *circ, uint8_t cell_type,
const uint8_t *reply);
struct created_cell_t;
int circuit_finish_handshake(origin_circuit_t *circ,
const struct created_cell_t *created_cell);
int circuit_truncated(origin_circuit_t *circ, crypt_path_t *layer,
int reason);
int onionskin_answer(or_circuit_t *circ, uint8_t cell_type,
const char *payload, size_t payload_len,
const char *keys);
const char *keys,
const uint8_t *rend_circ_nonce);
int circuit_all_predicted_ports_handled(time_t now, int *need_uptime,
int *need_capacity);

73
src/or/command.c
View File

@ -29,9 +29,7 @@
#include "cpuworker.h"
#include "hibernate.h"
#include "nodelist.h"
//#include "onion.h"
#include "onion_tap.h"
#include "onion_fast.h"
#include "onion.h"
#include "relay.h"
#include "router.h"
#include "routerlist.h"
@ -189,6 +187,7 @@ command_process_create_cell(cell_t *cell, channel_t *chan)
or_circuit_t *circ;
const or_options_t *options = get_options();
int id_is_high;
create_cell_t *create_cell;
tor_assert(cell);
tor_assert(chan);
@ -254,12 +253,18 @@ command_process_create_cell(cell_t *cell, channel_t *chan)
circ = or_circuit_new(cell->circ_id, chan);
circ->base_.purpose = CIRCUIT_PURPOSE_OR;
circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_ONIONSKIN_PENDING);
if (cell->command == CELL_CREATE) {
char *onionskin = tor_malloc(TAP_ONIONSKIN_CHALLENGE_LEN);
memcpy(onionskin, cell->payload, TAP_ONIONSKIN_CHALLENGE_LEN);
create_cell = tor_malloc_zero(sizeof(create_cell_t));
if (create_cell_parse(create_cell, cell) < 0) {
tor_free(create_cell);
log_fn(LOG_PROTOCOL_WARN, LD_OR,
"Bogus/unrecognized create cell; closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_TORPROTOCOL);
return;
}
if (create_cell->handshake_type != ONION_HANDSHAKE_TYPE_FAST) {
/* hand it off to the cpuworkers, and then return. */
if (assign_onionskin_to_cpuworker(NULL, circ, onionskin) < 0) {
if (assign_onionskin_to_cpuworker(NULL, circ, create_cell) < 0) {
log_debug(LD_GENERAL,"Failed to hand off onionskin. Closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_RESOURCELIMIT);
return;
@ -268,27 +273,35 @@ command_process_create_cell(cell_t *cell, channel_t *chan)
} else {
/* This is a CREATE_FAST cell; we can handle it immediately without using
* a CPU worker. */
char keys[CPATH_KEY_MATERIAL_LEN];
char reply[DIGEST_LEN*2];
tor_assert(cell->command == CELL_CREATE_FAST);
uint8_t keys[CPATH_KEY_MATERIAL_LEN];
uint8_t reply[MAX_ONIONSKIN_REPLY_LEN];
uint8_t rend_circ_nonce[DIGEST_LEN];
int len;
/* Make sure we never try to use the OR connection on which we
* received this cell to satisfy an EXTEND request, */
channel_mark_client(chan);
if (fast_server_handshake(cell->payload, (uint8_t*)reply,
(uint8_t*)keys, sizeof(keys))<0) {
len = onion_skin_server_handshake(ONION_HANDSHAKE_TYPE_FAST,
create_cell->onionskin,
create_cell->handshake_len,
NULL,
reply, keys, CPATH_KEY_MATERIAL_LEN,
rend_circ_nonce);
tor_free(create_cell);
if (len < 0) {
log_warn(LD_OR,"Failed to generate key material. Closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
tor_free(create_cell);
return;
}
if (onionskin_answer(circ, CELL_CREATED_FAST, reply, sizeof(reply),
keys)<0) {
if (onionskin_answer(circ, CELL_CREATED_FAST, (const char *)reply, len,
(const char *)keys, rend_circ_nonce)<0) {
log_warn(LD_OR,"Failed to reply to CREATE_FAST cell. Closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
return;
}
memwipe(keys, 0, sizeof(keys));
}
}
@ -304,6 +317,7 @@ static void
command_process_created_cell(cell_t *cell, channel_t *chan)
{
circuit_t *circ;
extended_cell_t extended_cell;
circ = circuit_get_by_circid_channel(cell->circ_id, chan);
@ -321,12 +335,18 @@ command_process_created_cell(cell_t *cell, channel_t *chan)
return;
}
if (created_cell_parse(&extended_cell.created_cell, cell) < 0) {
log_fn(LOG_PROTOCOL_WARN, LD_OR, "Unparseable created cell.");
circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
return;
}
if (CIRCUIT_IS_ORIGIN(circ)) { /* we're the OP. Handshake this. */
origin_circuit_t *origin_circ = TO_ORIGIN_CIRCUIT(circ);
int err_reason = 0;
log_debug(LD_OR,"at OP. Finishing handshake.");
if ((err_reason = circuit_finish_handshake(origin_circ, cell->command,
cell->payload)) < 0) {
if ((err_reason = circuit_finish_handshake(origin_circ,
&extended_cell.created_cell)) < 0) {
log_warn(LD_OR,"circuit_finish_handshake failed.");
circuit_mark_for_close(circ, -err_reason);
return;
@ -339,11 +359,24 @@ command_process_created_cell(cell_t *cell, channel_t *chan)
return;
}
} else { /* pack it into an extended relay cell, and send it. */
uint8_t command=0;
uint16_t len=0;
uint8_t payload[RELAY_PAYLOAD_SIZE];
log_debug(LD_OR,
"Converting created cell to extended relay cell, sending.");
relay_send_command_from_edge(0, circ, RELAY_COMMAND_EXTENDED,
(char*)cell->payload, TAP_ONIONSKIN_REPLY_LEN,
NULL);
memset(payload, 0, sizeof(payload));
if (extended_cell.created_cell.cell_type == CELL_CREATED2)
extended_cell.cell_type = RELAY_COMMAND_EXTENDED2;
else
extended_cell.cell_type = RELAY_COMMAND_EXTENDED;
if (extended_cell_format(&command, &len, payload, &extended_cell) < 0) {
log_fn(LOG_PROTOCOL_WARN, LD_OR, "Can't format extended cell.");
circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
return;
}
relay_send_command_from_edge(0, circ, command,
(const char*)payload, len, NULL);
}
}

185
src/or/cpuworker.c
View File

@ -23,7 +23,6 @@
#include "cpuworker.h"
#include "main.h"
#include "onion.h"
#include "onion_tap.h"
#include "router.h"
/** The maximum number of cpuworker processes we will keep around. */
@ -33,9 +32,6 @@
/** The tag specifies which circuit this onionskin was from. */
#define TAG_LEN 10
/** How many bytes are sent from the cpuworker back to tor? */
#define LEN_ONION_RESPONSE \
(1+TAG_LEN+TAP_ONIONSKIN_REPLY_LEN+CPATH_KEY_MATERIAL_LEN)
/** How many cpuworkers we have running right now. */
static int num_cpuworkers=0;
@ -71,7 +67,7 @@ connection_cpu_finished_flushing(connection_t *conn)
/** Pack global_id and circ_id; set *tag to the result. (See note on
* cpuworker_main for wire format.) */
static void
tag_pack(char *tag, uint64_t chan_id, circid_t circ_id)
tag_pack(uint8_t *tag, uint64_t chan_id, circid_t circ_id)
{
/*XXXX RETHINK THIS WHOLE MESS !!!! !NM NM NM NM*/
/*XXXX DOUBLEPLUSTHIS!!!! AS AS AS AS*/
@ -82,12 +78,38 @@ tag_pack(char *tag, uint64_t chan_id, circid_t circ_id)
/** Unpack <b>tag</b> into addr, port, and circ_id.
*/
static void
tag_unpack(const char *tag, uint64_t *chan_id, circid_t *circ_id)
tag_unpack(const uint8_t *tag, uint64_t *chan_id, circid_t *circ_id)
{
*chan_id = get_uint64(tag);
*circ_id = get_uint16(tag+8);
}
/** DOCDOC */
#define CPUWORKER_REQUEST_MAGIC 0xda4afeed
#define CPUWORKER_REPLY_MAGIC 0x5eedf00d
/**DOCDOC*/
typedef struct cpuworker_request_t {
uint32_t magic;
/** Opaque tag to identify the job */
uint8_t tag[TAG_LEN];
uint8_t task;
create_cell_t create_cell;
/* Turn the above into a tagged union if needed. */
} cpuworker_request_t;
/**DOCDOC*/
typedef struct cpuworker_reply_t {
uint32_t magic;
uint8_t tag[TAG_LEN];
uint8_t success;
created_cell_t created_cell;
uint8_t keys[CPATH_KEY_MATERIAL_LEN];
uint8_t rend_auth_material[DIGEST_LEN];
} cpuworker_reply_t;
/** Called when the onion key has changed and we need to spawn new
* cpuworkers. Close all currently idle cpuworkers, and mark the last
* rotation time as now.
@ -133,8 +155,6 @@ connection_cpu_reached_eof(connection_t *conn)
int
connection_cpu_process_inbuf(connection_t *conn)
{
char success;
char buf[LEN_ONION_RESPONSE];
uint64_t chan_id;
circid_t circ_id;
channel_t *p_chan = NULL;
@ -147,15 +167,16 @@ connection_cpu_process_inbuf(connection_t *conn)
return 0;
if (conn->state == CPUWORKER_STATE_BUSY_ONION) {
if (connection_get_inbuf_len(conn) < LEN_ONION_RESPONSE)
cpuworker_reply_t rpl;
if (connection_get_inbuf_len(conn) < sizeof(cpuworker_reply_t))
return 0; /* not yet */
tor_assert(connection_get_inbuf_len(conn) == LEN_ONION_RESPONSE);
tor_assert(connection_get_inbuf_len(conn) == sizeof(cpuworker_reply_t));
connection_fetch_from_buf(&success,1,conn);
connection_fetch_from_buf(buf,LEN_ONION_RESPONSE-1,conn);
connection_fetch_from_buf((void*)&rpl,sizeof(cpuworker_reply_t),conn);
tor_assert(rpl.magic == CPUWORKER_REPLY_MAGIC);
/* parse out the circ it was talking about */
tag_unpack(buf, &chan_id, &circ_id);
tag_unpack(rpl.tag, &chan_id, &circ_id);
circ = NULL;
log_debug(LD_OR,
"Unpacking cpuworker reply, chan_id is " U64_FORMAT
@ -166,7 +187,7 @@ connection_cpu_process_inbuf(connection_t *conn)
if (p_chan)
circ = circuit_get_by_circid_channel(circ_id, p_chan);
if (success == 0) {
if (rpl.success == 0) {
log_debug(LD_OR,
"decoding onionskin failed. "
"(Old key or bad software.) Closing.");
@ -184,9 +205,12 @@ connection_cpu_process_inbuf(connection_t *conn)
goto done_processing;
}
tor_assert(! CIRCUIT_IS_ORIGIN(circ));
if (onionskin_answer(TO_OR_CIRCUIT(circ), CELL_CREATED, buf+TAG_LEN,
TAP_ONIONSKIN_REPLY_LEN,
buf+TAG_LEN+TAP_ONIONSKIN_REPLY_LEN) < 0) {
if (onionskin_answer(TO_OR_CIRCUIT(circ),
rpl.created_cell.cell_type,
(const char*)rpl.created_cell.reply,
rpl.created_cell.handshake_len,
(const char*)rpl.keys,
rpl.rend_auth_material) < 0) {
log_warn(LD_OR,"onionskin_answer failed. Closing.");
circuit_mark_for_close(circ, END_CIRC_REASON_INTERNAL);
goto done_processing;
@ -213,32 +237,21 @@ connection_cpu_process_inbuf(connection_t *conn)
* Read and writes from fdarray[1]. Reads requests, writes answers.
*
* Request format:
* Task type [1 byte, always CPUWORKER_TASK_ONION]
* Opaque tag TAG_LEN
* Onionskin challenge TAP_ONIONSKIN_CHALLENGE_LEN
* cpuworker_request_t.
* Response format:
* Success/failure [1 byte, boolean.]
* Opaque tag TAG_LEN
* Onionskin challenge TAP_ONIONSKIN_REPLY_LEN
* Negotiated keys KEY_LEN*2+DIGEST_LEN*2
*
* (Note: this _should_ be by addr/port, since we're concerned with specific
* connections, not with routers (where we'd use identity).)
* cpuworker_reply_t
*/
static void
cpuworker_main(void *data)
{
char question[TAP_ONIONSKIN_CHALLENGE_LEN];
uint8_t question_type;
/* For talking to the parent thread/process */
tor_socket_t *fdarray = data;
tor_socket_t fd;
/* variables for onion processing */
char keys[CPATH_KEY_MATERIAL_LEN];
char reply_to_proxy[MAX_ONIONSKIN_REPLY_LEN];
char buf[LEN_ONION_RESPONSE];
char tag[TAG_LEN];
server_onion_keys_t onion_keys;
cpuworker_request_t req;
cpuworker_reply_t rpl;
fd = fdarray[1]; /* this side is ours */
#ifndef TOR_IS_MULTITHREADED
@ -252,65 +265,64 @@ cpuworker_main(void *data)
setup_server_onion_keys(&onion_keys);
for (;;) {
ssize_t r;
if ((r = recv(fd, (void *)&question_type, 1, 0)) != 1) {
// log_fn(LOG_ERR,"read type failed. Exiting.");
if (r == 0) {
log_info(LD_OR,
"CPU worker exiting because Tor process closed connection "
"(either rotated keys or died).");
} else {
log_info(LD_OR,
"CPU worker exiting because of error on connection to Tor "
"process.");
log_info(LD_OR,"(Error on %d was %s)",
fd, tor_socket_strerror(tor_socket_errno(fd)));
}
if (read_all(fd, (void *)&req, sizeof(req), 1) != sizeof(req)) {
log_info(LD_OR, "read request failed. Exiting.");
goto end;
}
tor_assert(question_type == CPUWORKER_TASK_ONION);
tor_assert(req.magic == CPUWORKER_REQUEST_MAGIC);
if (read_all(fd, tag, TAG_LEN, 1) != TAG_LEN) {
log_err(LD_BUG,"read tag failed. Exiting.");
goto end;
}
memset(&rpl, 0, sizeof(rpl));
if (read_all(fd, question, TAP_ONIONSKIN_CHALLENGE_LEN, 1) !=
TAP_ONIONSKIN_CHALLENGE_LEN) {
log_err(LD_BUG,"read question failed. Exiting.");
goto end;
}
if (question_type == CPUWORKER_TASK_ONION) {
if (onion_skin_server_handshake(ONION_HANDSHAKE_TYPE_TAP,
(const uint8_t*)question,
&onion_keys,
(uint8_t*)reply_to_proxy,
(uint8_t*)keys, CPATH_KEY_MATERIAL_LEN) < 0) {
if (req.task == CPUWORKER_TASK_ONION) {
const create_cell_t *cc = &req.create_cell;
created_cell_t *cell_out = &rpl.created_cell;
int n;
n = onion_skin_server_handshake(cc->handshake_type,
cc->onionskin, cc->handshake_len,
&onion_keys,
cell_out->reply,
rpl.keys, CPATH_KEY_MATERIAL_LEN,
rpl.rend_auth_material);
if (n < 0) {
/* failure */
log_debug(LD_OR,"onion_skin_server_handshake failed.");
*buf = 0; /* indicate failure in first byte */
memcpy(buf+1,tag,TAG_LEN);
/* send all zeros as answer */
memset(buf+1+TAG_LEN, 0, LEN_ONION_RESPONSE-(1+TAG_LEN));
memset(&rpl, 0, sizeof(rpl));
memcpy(rpl.tag, req.tag, TAG_LEN);
rpl.success = 0;
} else {
/* success */
log_debug(LD_OR,"onion_skin_server_handshake succeeded.");
buf[0] = 1; /* 1 means success */
memcpy(buf+1,tag,TAG_LEN);
memcpy(buf+1+TAG_LEN,reply_to_proxy,TAP_ONIONSKIN_REPLY_LEN);
memcpy(buf+1+TAG_LEN+TAP_ONIONSKIN_REPLY_LEN,keys,
CPATH_KEY_MATERIAL_LEN);
memcpy(rpl.tag, req.tag, TAG_LEN);
cell_out->handshake_len = n;
switch (cc->cell_type) {
case CELL_CREATE:
cell_out->cell_type = CELL_CREATED; break;
case CELL_CREATE2:
cell_out->cell_type = CELL_CREATED2; break;
case CELL_CREATE_FAST:
cell_out->cell_type = CELL_CREATED_FAST; break;
default:
tor_assert(0);
goto end;
}
rpl.success = 1;
}
if (write_all(fd, buf, LEN_ONION_RESPONSE, 1) != LEN_ONION_RESPONSE) {
rpl.magic = CPUWORKER_REPLY_MAGIC;
if (write_all(fd, (void*)&rpl, sizeof(rpl), 1) != sizeof(rpl)) {
log_err(LD_BUG,"writing response buf failed. Exiting.");
goto end;
}
log_debug(LD_OR,"finished writing response.");
} else if (req.task == CPUWORKER_TASK_SHUTDOWN) {
log_info(LD_OR,"Clean shutdown: exiting");
goto end;
}
memwipe(&req, 0, sizeof(req));
memwipe(&rpl, 0, sizeof(req));
}
end:
memwipe(&req, 0, sizeof(req));
memwipe(&rpl, 0, sizeof(req));
release_server_onion_keys(&onion_keys);
tor_close_socket(fd);
crypto_thread_cleanup();
@ -394,7 +406,7 @@ static void
process_pending_task(connection_t *cpuworker)
{
or_circuit_t *circ;
char *onionskin = NULL;
create_cell_t *onionskin = NULL;
tor_assert(cpuworker);
@ -447,10 +459,10 @@ cull_wedged_cpuworkers(void)
*/
int
assign_onionskin_to_cpuworker(connection_t *cpuworker,
or_circuit_t *circ, char *onionskin)
or_circuit_t *circ,
create_cell_t *onionskin)
{
char qbuf[1];
char tag[TAG_LEN];
cpuworker_request_t req;
time_t now = approx_time();
static time_t last_culled_cpuworkers = 0;
@ -486,7 +498,10 @@ assign_onionskin_to_cpuworker(connection_t *cpuworker,
tor_free(onionskin);
return -1;
}
tag_pack(tag, circ->p_chan->global_identifier,
memset(&req, 0, sizeof(req));
req.magic = CPUWORKER_REQUEST_MAGIC;
tag_pack(req.tag, circ->p_chan->global_identifier,
circ->p_circ_id);
cpuworker->state = CPUWORKER_STATE_BUSY_ONION;
@ -496,11 +511,13 @@ assign_onionskin_to_cpuworker(connection_t *cpuworker,
cpuworker->timestamp_lastwritten = time(NULL);
num_cpuworkers_busy++;
qbuf[0] = CPUWORKER_TASK_ONION;
connection_write_to_buf(qbuf, 1, cpuworker);
connection_write_to_buf(tag, sizeof(tag), cpuworker);
connection_write_to_buf(onionskin, TAP_ONIONSKIN_CHALLENGE_LEN, cpuworker);
req.task = CPUWORKER_TASK_ONION;
memcpy(&req.create_cell, onionskin, sizeof(create_cell_t));
tor_free(onionskin);
connection_write_to_buf((void*)&req, sizeof(req), cpuworker);
memwipe(&req, 0, sizeof(req));
}
return 0;
}

3
src/or/cpuworker.h
View File

@ -17,9 +17,10 @@ void cpuworkers_rotate(void);
int connection_cpu_finished_flushing(connection_t *conn);
int connection_cpu_reached_eof(connection_t *conn);
int connection_cpu_process_inbuf(connection_t *conn);
struct create_cell_t;
int assign_onionskin_to_cpuworker(connection_t *cpuworker,
or_circuit_t *circ,
char *onionskin);
struct create_cell_t *onionskin);
#endif

57
src/or/onion.c
View File

@ -25,7 +25,7 @@
* to process a waiting onion handshake. */
typedef struct onion_queue_t {
or_circuit_t *circ;
char *onionskin;
create_cell_t *onionskin;
time_t when_added;
struct onion_queue_t *next;
} onion_queue_t;
@ -48,7 +48,7 @@ static int ol_length=0;
* if ol_list is too long, in which case do nothing and return -1.
*/
int
onion_pending_add(or_circuit_t *circ, char *onionskin)
onion_pending_add(or_circuit_t *circ, create_cell_t *onionskin)
{
onion_queue_t *tmp;
time_t now = time(NULL);
@ -105,7 +105,7 @@ onion_pending_add(or_circuit_t *circ, char *onionskin)
* NULL if the list is empty.
*/
or_circuit_t *
onion_next_task(char **onionskin_out)
onion_next_task(create_cell_t **onionskin_out)
{
or_circuit_t *circ;
@ -302,37 +302,60 @@ onion_skin_create(int type,
* using the keys in <b>keys</b>. On success, write our response into
* <b>reply_out</b>, generate <b>keys_out_len</b> bytes worth of key material
* in <b>keys_out_len</b>, and return the length of the reply. On failure,
* return -1. */
* return -1.
* DOCDOC rend_nonce_out
*/
int
onion_skin_server_handshake(int type,
const uint8_t *onion_skin,
const uint8_t *onion_skin, size_t onionskin_len,
const server_onion_keys_t *keys,
uint8_t *reply_out,
uint8_t *keys_out, size_t keys_out_len)
uint8_t *keys_out, size_t keys_out_len,
uint8_t *rend_nonce_out)
{
int r = -1;
switch (type) {
case ONION_HANDSHAKE_TYPE_TAP:
if (onionskin_len != TAP_ONIONSKIN_CHALLENGE_LEN)
return -1;
if (onion_skin_TAP_server_handshake((const char*)onion_skin,
keys->onion_key, keys->last_onion_key,
(char*)reply_out,
(char*)keys_out, keys_out_len)<0)
return -1;
r = TAP_ONIONSKIN_REPLY_LEN;
memcpy(rend_nonce_out, reply_out+DH_KEY_LEN, DIGEST_LEN);
break;
case ONION_HANDSHAKE_TYPE_FAST:
if (onionskin_len != CREATE_FAST_LEN)
return -1;
if (fast_server_handshake(onion_skin, reply_out, keys_out, keys_out_len)<0)
return -1;
r = CREATED_FAST_LEN;
memcpy(rend_nonce_out, reply_out+DIGEST_LEN, DIGEST_LEN);
break;
case ONION_HANDSHAKE_TYPE_NTOR:
#ifdef CURVE25519_ENABLED
if (onion_skin_ntor_server_handshake(onion_skin, keys->curve25519_key_map,
keys->my_identity,
reply_out, keys_out, keys_out_len)<0)
if (onionskin_len != NTOR_ONIONSKIN_LEN)
return -1;
r = NTOR_REPLY_LEN;
{
size_t keys_tmp_len = keys_out_len + DIGEST_LEN;
uint8_t *keys_tmp = tor_malloc(keys_out_len + DIGEST_LEN);
if (onion_skin_ntor_server_handshake(
onion_skin, keys->curve25519_key_map,
keys->my_identity,
reply_out, keys_tmp, keys_tmp_len)<0) {
tor_free(keys_tmp);
return -1;
}
memcpy(keys_out, keys_tmp, keys_out_len);
memcpy(rend_nonce_out, keys_tmp+keys_out_len, DIGEST_LEN);
memwipe(keys_tmp, 0, keys_tmp_len);
tor_free(keys_tmp);
r = NTOR_REPLY_LEN;
}
#else
return -1;
#endif
@ -343,12 +366,6 @@ onion_skin_server_handshake(int type,
return -1;
}
/* XXXX we should generate the rendezvous nonce stuff too. Some notes
* below */
// memcpy(hop->handshake_digest, reply+DH_KEY_LEN, DIGEST_LEN);
//memcpy(hop->handshake_digest, reply+DIGEST_LEN, DIGEST_LEN);
return r;
}
@ -362,7 +379,7 @@ onion_skin_server_handshake(int type,
int
onion_skin_client_handshake(int type,
const onion_handshake_state_t *handshake_state,
const uint8_t *reply,
const uint8_t *reply, size_t reply_len,
uint8_t *keys_out, size_t keys_out_len,
uint8_t *rend_authenticator_out)
{
@ -371,6 +388,8 @@ onion_skin_client_handshake(int type,
switch (type) {
case ONION_HANDSHAKE_TYPE_TAP:
if (reply_len != TAP_ONIONSKIN_REPLY_LEN)
return -1;
if (onion_skin_TAP_client_handshake(handshake_state->u.tap,
(const char*)reply,
(char *)keys_out, keys_out_len) < 0)
@ -380,6 +399,8 @@ onion_skin_client_handshake(int type,
return 0;
case ONION_HANDSHAKE_TYPE_FAST:
if (reply_len != CREATED_FAST_LEN)
return -1;
if (fast_client_handshake(handshake_state->u.fast, reply,
keys_out, keys_out_len) < 0)
return -1;
@ -388,6 +409,8 @@ onion_skin_client_handshake(int type,
return 0;
#ifdef CURVE25519_ENABLED
case ONION_HANDSHAKE_TYPE_NTOR:
if (reply_len != NTOR_REPLY_LEN)
return -1;
{
size_t keys_tmp_len = keys_out_len + DIGEST_LEN;
uint8_t *keys_tmp = tor_malloc(keys_tmp_len);

13
src/or/onion.h
View File

@ -12,8 +12,9 @@
#ifndef TOR_ONION_H
#define TOR_ONION_H
int onion_pending_add(or_circuit_t *circ, char *onionskin);
or_circuit_t *onion_next_task(char **onionskin_out);
struct create_cell_t;
int onion_pending_add(or_circuit_t *circ, struct create_cell_t *onionskin);
or_circuit_t *onion_next_task(struct create_cell_t **onionskin_out);
void onion_pending_remove(or_circuit_t *circ);
void clear_pending_onions(void);
@ -39,14 +40,14 @@ int onion_skin_create(int type,
onion_handshake_state_t *state_out,
uint8_t *onion_skin_out);
int onion_skin_server_handshake(int type,
const uint8_t *onion_skin,
const uint8_t *onion_skin, size_t onionskin_len,
const server_onion_keys_t *keys,
uint8_t *reply_out,
uint8_t *keys_out, size_t key_out_len);
// uint8_t *rend_authenticator_out);
uint8_t *keys_out, size_t key_out_len,
uint8_t *rend_nonce_out);
int onion_skin_client_handshake(int type,
const onion_handshake_state_t *handshake_state,
const uint8_t *reply,
const uint8_t *reply, size_t reply_len,
uint8_t *keys_out, size_t key_out_len,
uint8_t *rend_authenticator_out);

1
src/or/or.h
View File

@ -280,6 +280,7 @@ typedef enum {
#define CPUWORKER_STATE_MAX_ 2
#define CPUWORKER_TASK_ONION CPUWORKER_STATE_BUSY_ONION
#define CPUWORKER_TASK_SHUTDOWN 255
#define OR_CONN_STATE_MIN_ 1
/** State for a connection to an OR: waiting for connect() to finish. */

20
src/or/relay.c
View File

@ -27,6 +27,7 @@
#include "mempool.h"
#include "networkstatus.h"
#include "nodelist.h"
#include "onion.h"
#include "policies.h"
#include "reasons.h"
#include "relay.h"
@ -1296,11 +1297,20 @@ connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ,
return 0;
}
log_debug(domain,"Got an extended cell! Yay.");
if ((reason = circuit_finish_handshake(TO_ORIGIN_CIRCUIT(circ),
CELL_CREATED,
cell->payload+RELAY_HEADER_SIZE)) < 0) {
log_warn(domain,"circuit_finish_handshake failed.");
return reason;
{
extended_cell_t extended_cell;
if (extended_cell_parse(&extended_cell, rh.command,
(const uint8_t*)cell->payload+RELAY_HEADER_SIZE,
rh.length)<0) {
log_warn(LD_PROTOCOL,
"Can't parse EXTENDED cell; killing circuit.");
return -END_CIRC_REASON_TORPROTOCOL;
}
if ((reason = circuit_finish_handshake(TO_ORIGIN_CIRCUIT(circ),
&extended_cell.created_cell)) < 0) {
log_warn(domain,"circuit_finish_handshake failed.");
return reason;
}
}
if ((reason=circuit_send_next_onion_skin(TO_ORIGIN_CIRCUIT(circ)))<0) {
log_info(domain,"circuit_send_next_onion_skin() failed.");