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https://gitlab.torproject.org/tpo/core/tor.git
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checkpoint: revamp relay cell packaging and handling
include the infrastructure for inserting padding cells when there's a relay-recognized conflict, but it does not work currently. svn:r958
This commit is contained in:
Roger Dingledine
parent
bc8c6732cb
commit
43fcb70bad
280
src/or/circuit.c
280
src/or/circuit.c
@ -311,7 +311,7 @@ int circuit_stream_is_being_handled(connection_t *conn) {
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}
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/* update digest from the payload of cell. assign integrity part to cell. */
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void relay_set_digest(crypto_digest_env_t *digest, cell_t *cell) {
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static void relay_set_digest(crypto_digest_env_t *digest, cell_t *cell) {
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uint32_t integrity;
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relay_header_t rh;
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@ -326,7 +326,7 @@ void relay_set_digest(crypto_digest_env_t *digest, cell_t *cell) {
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/* update digest from the payload of cell (with the integrity part set
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* to 0). If the integrity part is valid return 0, else return -1.
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*/
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int relay_check_digest(crypto_digest_env_t *digest, cell_t *cell) {
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static int relay_check_digest(crypto_digest_env_t *digest, cell_t *cell) {
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uint32_t received_integrity, calculated_integrity;
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relay_header_t rh;
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@ -348,16 +348,40 @@ int relay_check_digest(crypto_digest_env_t *digest, cell_t *cell) {
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return 0;
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}
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int circuit_deliver_relay_cell(cell_t *cell, circuit_t *circ,
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int cell_direction, crypt_path_t *layer_hint) {
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static int relay_crypt_one_payload(crypto_cipher_env_t *cipher, char *in,
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int encrypt_mode) {
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char out[CELL_PAYLOAD_SIZE]; /* 'in' must be this size too */
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relay_header_t rh;
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relay_header_unpack(&rh, in);
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log_fn(LOG_INFO,"before crypt: %d",rh.recognized);
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if(( encrypt_mode && crypto_cipher_encrypt(cipher, in, CELL_PAYLOAD_SIZE, out)) ||
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(!encrypt_mode && crypto_cipher_decrypt(cipher, in, CELL_PAYLOAD_SIZE, out))) {
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log_fn(LOG_WARN,"Error during crypt: %s", crypto_perror());
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return -1;
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}
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memcpy(in,out,CELL_PAYLOAD_SIZE);
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relay_header_unpack(&rh, in);
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log_fn(LOG_INFO,"after crypt: %d",rh.recognized);
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return 0;
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}
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/*
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receive a relay cell:
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- crypt it (encrypt APward, decrypt at AP, decrypt exitward)
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- check if recognized (if exitward)
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- if recognized, check digest, find right conn, deliver to edge.
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- else connection_or_write_cell_to_buf to the right conn
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*/
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int circuit_receive_relay_cell(cell_t *cell, circuit_t *circ,
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int cell_direction) {
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connection_t *conn=NULL;
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crypt_path_t *layer_hint=NULL;
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char recognized=0;
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assert(cell && circ);
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assert(cell_direction == CELL_DIRECTION_OUT || cell_direction == CELL_DIRECTION_IN);
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log_fn(LOG_DEBUG,"direction %d, stream_id %d before crypt.", cell_direction, *(uint16_t*)(cell->payload+1));/*XXX*/
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if(relay_crypt(circ, cell->payload, cell_direction,
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&layer_hint, &recognized) < 0) {
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log_fn(LOG_WARN,"relay crypt failed. Dropping connection.");
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@ -394,15 +418,17 @@ int circuit_deliver_relay_cell(cell_t *cell, circuit_t *circ,
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}
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/* not recognized. pass it on. */
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if(cell_direction == CELL_DIRECTION_OUT)
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if(cell_direction == CELL_DIRECTION_OUT) {
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cell->circ_id = circ->n_circ_id; /* switch it */
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conn = circ->n_conn;
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else
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} else {
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cell->circ_id = circ->p_circ_id; /* switch it */
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conn = circ->p_conn;
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}
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if(!conn) {
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log_fn(LOG_INFO,"Didn't recognize cell (%d), but circ stops here! Dropping.",
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*(int *)(cell->payload+1));
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return 0;
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log_fn(LOG_WARN,"Didn't recognize cell, but circ stops here! Dropping.");
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return 0; /* XXX if this warning never triggers, then return -1 */
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}
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log_fn(LOG_DEBUG,"Passing on unrecognized cell.");
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@ -411,10 +437,10 @@ int circuit_deliver_relay_cell(cell_t *cell, circuit_t *circ,
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return 0;
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}
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/* wrap this into receive_relay_cell one day */
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static int relay_crypt(circuit_t *circ, char *in, char cell_direction,
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crypt_path_t **layer_hint, char *recognized) {
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crypt_path_t *thishop;
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char out[CELL_PAYLOAD_SIZE]; /* 'in' must be this size too */
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relay_header_t rh;
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assert(circ && in && recognized);
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@ -431,16 +457,11 @@ static int relay_crypt(circuit_t *circ, char *in, char cell_direction,
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do { /* Remember: cpath is in forward order, that is, first hop first. */
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assert(thishop);
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log_fn(LOG_DEBUG,"before decrypt: %d",*(uint16_t*)(in+1));
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/* decrypt */
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if(crypto_cipher_decrypt(thishop->b_crypto, in, CELL_PAYLOAD_SIZE, out)) {
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log_fn(LOG_WARN,"Error performing onion decryption: %s", crypto_perror());
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if(relay_crypt_one_payload(thishop->b_crypto, in, 0) < 0)
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return -1;
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}
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memcpy(in,out,CELL_PAYLOAD_SIZE);
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log_fn(LOG_DEBUG,"after decrypt: %d",*(uint16_t*)(in+1));
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if(*(uint16_t*)(in+1) == 0) { /* XXX */
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relay_header_unpack(&rh, in);
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if(rh.recognized == 0) {
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*recognized = 1;
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*layer_hint = thishop;
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return 0;
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@ -448,59 +469,196 @@ static int relay_crypt(circuit_t *circ, char *in, char cell_direction,
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thishop = thishop->next;
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} while(thishop != circ->cpath && thishop->state == CPATH_STATE_OPEN);
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log_fn(LOG_INFO,"in-cell at OP not recognized. Dropping.");
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log_fn(LOG_WARN,"in-cell at OP not recognized. Dropping.");
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return 0;
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} else { /* we're in the middle. Just one crypt. */
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log_fn(LOG_DEBUG,"before encrypt: %d",*(uint16_t*)(in+1));
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if(crypto_cipher_encrypt(circ->p_crypto, in, CELL_PAYLOAD_SIZE, out)) {
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log_fn(LOG_WARN,"Onion encryption failed for circID %u: %s",
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circ->p_circ_id, crypto_perror());
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if(relay_crypt_one_payload(circ->p_crypto, in, 1) < 0)
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return -1;
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}
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memcpy(in,out,CELL_PAYLOAD_SIZE);
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log_fn(LOG_DEBUG,"after encrypt: %d",*(uint16_t*)(in+1));
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log_fn(LOG_DEBUG,"Skipping recognized check, because we're not the OP.");
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/* don't check for recognized. only the OP can recognize a stream on the way back. */
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}
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} else /* cell_direction == CELL_DIRECTION_OUT */ {
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if(circ->cpath) { /* we're at the beginning of the circuit. We'll want to do layered crypts. */
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/* we're in the middle. Just one crypt. */
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thishop = *layer_hint; /* we already know which layer, from when we package_raw_inbuf'ed */
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/* moving from last to first hop */
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do {
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assert(thishop);
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if(relay_crypt_one_payload(circ->n_crypto, in, 0) < 0)
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return -1;
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log_fn(LOG_DEBUG,"before encrypt: %d",*(uint16_t*)(in+1));
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if(crypto_cipher_encrypt(thishop->f_crypto, in, CELL_PAYLOAD_SIZE, out)) {
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log_fn(LOG_WARN,"Error performing encryption: %s", crypto_perror());
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return -1;
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}
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memcpy(in,out,CELL_PAYLOAD_SIZE);
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log_fn(LOG_DEBUG,"after encrypt: %d",*(uint16_t*)(in+1));
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thishop = thishop->prev;
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} while(thishop != circ->cpath->prev);
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} else { /* we're in the middle. Just one crypt. */
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if(crypto_cipher_decrypt(circ->n_crypto,in, CELL_PAYLOAD_SIZE, out)) {
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log_fn(LOG_WARN,"Decryption failed for circID %u: %s",
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circ->n_circ_id, crypto_perror());
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return -1;
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}
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memcpy(in,out,CELL_PAYLOAD_SIZE);
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if(*(uint16_t*)(in+1) == 0) { /* XXX */
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*recognized = 1;
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return 0;
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}
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relay_header_unpack(&rh, in);
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if (rh.recognized == 0 ||
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(!circ->n_conn && rh.recognized == 11257)) {
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/* as a special exception, hops at the end of the circuit
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* recognize 01 as well. */
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log_fn(LOG_INFO,"Recognized '%d'", rh.recognized);
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*recognized = 1;
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return 0;
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}
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}
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return 0;
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}
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static connection_t *relay_lookup_conn(circuit_t *circ, cell_t *cell, int cell_direction) {
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/* Helper function for circuit_package_relay_cell().
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* crypt the cell from layer_hint backward. if there's a conflict,
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* set *conflicthop to the nearest conflict, rewind all the ciphers,
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* and restore the digest state.
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*
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* Conflicthop is set to the node whose cipher is going to output
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* recognized=0. That is, the hop after conflicthop needs to receive
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* the dummy cell.
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*/
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static int
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relay_try_all_crypts(cell_t *cell, circuit_t *circ, crypt_path_t *layer_hint,
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uint16_t recognized, crypt_path_t **conflicthop)
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{
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crypt_path_t *thishop; /* counter for repeated crypts */
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relay_header_t rh; /* to set/check 'recognized' */
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crypto_digest_env_t *backup_digest=NULL;
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backup_digest = crypto_digest_dup(layer_hint->f_digest);
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relay_header_unpack(&rh, cell->payload);
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rh.recognized = recognized;
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relay_header_pack(cell->payload, &rh);
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relay_set_digest(layer_hint->f_digest, cell);
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*conflicthop = NULL;
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thishop = layer_hint;
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/* moving from farthest to nearest hop */
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do {
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assert(thishop);
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log_fn(LOG_INFO,"crypting a layer of the relay cell.");
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if(relay_crypt_one_payload(thishop->f_crypto, cell->payload, 1) < 0) {
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crypto_free_digest_env(backup_digest);
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return -1;
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}
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if(thishop != circ->cpath) {
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/* if it's not the nearest hop, make sure it didn't accidentally
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* encrypt recognized to 00. For the nearest hop it doesn't matter
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* because it will be blindly decrypting whatever it gets. */
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relay_header_unpack(&rh, cell->payload);
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// if(rh.recognized == 0) {
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if(rh.recognized < 10000) {
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log_fn(LOG_INFO,"Found conflict");
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*conflicthop = thishop;
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}
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}
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thishop = thishop->prev;
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} while (thishop != circ->cpath->prev);
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if(*conflicthop) {
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/* 1. Restore the old digest state */
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crypto_digest_assign(layer_hint->f_digest, backup_digest);
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/* 2. Restore old state for the ciphers that changed. */
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thishop = layer_hint;
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do {
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log_fn(LOG_INFO,"Rewinding a cipher layer...");
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crypto_cipher_rewind(thishop->f_crypto, CELL_PAYLOAD_SIZE);
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thishop = thishop->prev;
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} while (thishop != circ->cpath->prev);
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}
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/* else no conflict. success. */
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crypto_free_digest_env(backup_digest);
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return 0;
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}
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/*
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package a relay cell:
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- if from AP: encrypt it to the right conn if 'recognized' doesn't
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conflict, else insert dummies first as appropriate
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- if from exit: encrypt it
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- connection_or_write_cell_to_buf to the right conn
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*/
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int
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circuit_package_relay_cell(cell_t *cell, circuit_t *circ,
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int cell_direction,
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crypt_path_t *layer_hint)
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{
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connection_t *conn; /* where to send the cell */
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crypt_path_t *conflicthop; /* for padding to prematurely recognized hops */
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crypt_path_t *tmpconflicthop;
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relay_header_t rh; /* to make the dummy cell */
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/* backup cell and digest if we need to send a dummy instead */
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cell_t backup_cell;
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if(cell_direction == CELL_DIRECTION_OUT) {
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conn = circ->n_conn;
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if(!conn) {
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log_fn(LOG_INFO,"outgoing relay cell has n_conn==NULL. Dropping.");
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return 0; /* just drop it */
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}
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again:
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/* copy cell in case we need to send a dummy relay cell instead */
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memcpy(&backup_cell, cell, sizeof(cell_t));
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log_fn(LOG_INFO,"Starting to crypt my relay cell.");
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if(relay_try_all_crypts(cell, circ, layer_hint, 0, &conflicthop) < 0) {
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log_fn(LOG_WARN,"relay_try_deliver_cell (1) failed. Closing.");
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return -1;
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}
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if(conflicthop) {
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log_fn(LOG_WARN,"'recognized' conflict found. Sending padding.");
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/* 1a. build and set_digest a padding cell. */
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cell->circ_id = backup_cell.circ_id;
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cell->command = CELL_RELAY;
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rh.command = RELAY_COMMAND_DROP;
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rh.recognized = rh.stream_id = rh.integrity = rh.length = 0;
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relay_header_pack(cell->payload, &rh);
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memset(cell->payload+RELAY_HEADER_SIZE, 0, RELAY_PAYLOAD_SIZE);
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/* if conflicthop is the last hop in the circuit... */
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if(conflicthop == circ->cpath->prev ||
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conflicthop->next->state == CPATH_STATE_CLOSED) {
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log_fn(LOG_WARN,"Got a conflict at the end of the circuit, using recognized=1");
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if(relay_try_all_crypts(cell, circ, conflicthop, 11257, &tmpconflicthop) < 0) {
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log_fn(LOG_WARN,"relay_try_deliver_cell (2) failed. Closing.");
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return -1;
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}
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} else {
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log_fn(LOG_WARN,"Got a conflict inside the circuit, using recognized=0");
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if(relay_try_all_crypts(cell, circ, conflicthop->next, 0, &tmpconflicthop) < 0) {
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log_fn(LOG_WARN,"relay_try_deliver_cell (3) failed. Closing.");
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return -1;
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}
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}
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if(tmpconflicthop) { /* conflict with this one too?! */
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log_fn(LOG_WARN,"Conflict with sending padding relay cell. Closing.");
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return -1;
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}
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/* send it. */
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++stats_n_relay_cells_relayed;
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connection_or_write_cell_to_buf(cell, conn);
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log_fn(LOG_INFO,"Delivered my padding cell.");
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/* 2. Restore the original relay cell */
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memcpy(cell, &backup_cell, sizeof(cell_t));
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/* 3. Try again. */
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goto again;
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}
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/* no conflict, we succeeded. send it and be done. */
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} else { /* incoming cell */
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conn = circ->p_conn;
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if(!conn) {
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log_fn(LOG_INFO,"incoming relay cell has p_conn==NULL. Dropping.");
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return 0; /* just drop it */
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}
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relay_set_digest(circ->p_digest, cell);
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if(relay_crypt_one_payload(circ->p_crypto, cell->payload, 1) < 0)
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return -1;
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}
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++stats_n_relay_cells_relayed;
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connection_or_write_cell_to_buf(cell, conn);
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return 0;
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}
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static connection_t *
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relay_lookup_conn(circuit_t *circ, cell_t *cell, int cell_direction)
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{
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connection_t *tmpconn;
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relay_header_t rh;
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@ -916,7 +1074,7 @@ int circuit_send_next_onion_skin(circuit_t *circ) {
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* it to a create cell and then send to hop */
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if(connection_edge_send_command(NULL, circ, RELAY_COMMAND_EXTEND,
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payload, sizeof(payload), hop->prev) < 0)
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return -1; /* circuit is closed */
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return 0; /* circuit is closed */
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hop->state = CPATH_STATE_AWAITING_KEYS;
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}
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@ -168,16 +168,14 @@ static void command_process_relay_cell(cell_t *cell, connection_t *conn) {
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}
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if(cell->circ_id == circ->p_circ_id) { /* it's an outgoing cell */
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cell->circ_id = circ->n_circ_id; /* switch it */
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if(circuit_deliver_relay_cell(cell, circ, CELL_DIRECTION_OUT, conn->cpath_layer) < 0) {
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log_fn(LOG_WARN,"circuit_deliver_relay_cell (forward) failed. Closing.");
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if(circuit_receive_relay_cell(cell, circ, CELL_DIRECTION_OUT) < 0) {
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log_fn(LOG_WARN,"circuit_receive_relay_cell (forward) failed. Closing.");
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circuit_close(circ);
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return;
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}
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} else { /* it's an ingoing cell */
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cell->circ_id = circ->p_circ_id; /* switch it */
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if(circuit_deliver_relay_cell(cell, circ, CELL_DIRECTION_IN, NULL) < 0) {
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log_fn(LOG_WARN,"circuit_deliver_relay_cell (backward) failed. Closing.");
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if(circuit_receive_relay_cell(cell, circ, CELL_DIRECTION_IN) < 0) {
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log_fn(LOG_WARN,"circuit_receive_relay_cell (backward) failed. Closing.");
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circuit_close(circ);
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return;
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}
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@ -171,16 +171,11 @@ int connection_edge_send_command(connection_t *fromconn, circuit_t *circ, int re
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if(payload_len)
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memcpy(cell.payload+RELAY_HEADER_SIZE, payload, payload_len);
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if(cell_direction == CELL_DIRECTION_OUT) /* AP */
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relay_set_digest(cpath_layer->f_digest, &cell);
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else /* exit */
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relay_set_digest(circ->p_digest, &cell);
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log_fn(LOG_DEBUG,"delivering %d cell %s.", relay_command,
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cell_direction == CELL_DIRECTION_OUT ? "forward" : "backward");
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if(circuit_deliver_relay_cell(&cell, circ, cell_direction, cpath_layer) < 0) {
|
||||
log_fn(LOG_WARN,"circuit_deliver_relay_cell failed. Closing.");
|
||||
if(circuit_package_relay_cell(&cell, circ, cell_direction, cpath_layer) < 0) {
|
||||
log_fn(LOG_WARN,"circuit_package_relay_cell failed. Closing.");
|
||||
circuit_close(circ);
|
||||
return -1;
|
||||
}
|
||||
@ -226,6 +221,9 @@ int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection
|
||||
}
|
||||
|
||||
switch(rh.command) {
|
||||
case RELAY_COMMAND_DROP:
|
||||
log_fn(LOG_INFO,"Got a relay-level padding cell. Dropping.");
|
||||
return 0;
|
||||
case RELAY_COMMAND_BEGIN:
|
||||
if(edge_type == EDGE_AP) {
|
||||
log_fn(LOG_WARN,"relay begin request unsupported at AP. Dropping.");
|
||||
|
||||
@ -241,13 +241,14 @@ static int connection_tls_finish_handshake(connection_t *conn) {
|
||||
|
||||
/* ********************************** */
|
||||
|
||||
void connection_or_write_cell_to_buf(const cell_t *cellp, connection_t *conn) {
|
||||
void connection_or_write_cell_to_buf(const cell_t *cell, connection_t *conn) {
|
||||
char networkcell[CELL_NETWORK_SIZE];
|
||||
char *n = networkcell;
|
||||
|
||||
assert(cell && conn);
|
||||
assert(connection_speaks_cells(conn));
|
||||
|
||||
cell_pack(n, cellp);
|
||||
cell_pack(n, cell);
|
||||
|
||||
connection_write_to_buf(n, CELL_NETWORK_SIZE, conn);
|
||||
}
|
||||
|
||||
@ -565,9 +565,9 @@ void circuit_expire_building(void);
|
||||
int circuit_count_building(void);
|
||||
int circuit_stream_is_being_handled(connection_t *conn);
|
||||
|
||||
void relay_set_digest(crypto_digest_env_t *digest, cell_t *cell);
|
||||
int relay_check_digest(crypto_digest_env_t *digest, cell_t *cell);
|
||||
int circuit_deliver_relay_cell(cell_t *cell, circuit_t *circ,
|
||||
int circuit_receive_relay_cell(cell_t *cell, circuit_t *circ,
|
||||
int cell_direction);
|
||||
int circuit_package_relay_cell(cell_t *cell, circuit_t *circ,
|
||||
int cell_direction, crypt_path_t *layer_hint);
|
||||
|
||||
void circuit_resume_edge_reading(circuit_t *circ, int edge_type, crypt_path_t *layer_hint);
|
||||
@ -695,7 +695,7 @@ connection_t *connection_or_connect(routerinfo_t *router);
|
||||
int connection_tls_start_handshake(connection_t *conn, int receiving);
|
||||
int connection_tls_continue_handshake(connection_t *conn);
|
||||
|
||||
void connection_or_write_cell_to_buf(const cell_t *cellp, connection_t *conn);
|
||||
void connection_or_write_cell_to_buf(const cell_t *cell, connection_t *conn);
|
||||
|
||||
/********************************* cpuworker.c *****************************/
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user