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Made onion paths expire.

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irungentoo 2014-02-13 13:03:19 -05:00
parent 704c27c66c
commit cfb820c2fc
2 changed files with 25 additions and 0 deletions
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24
toxcore/onion.c
View File

@ -24,6 +24,7 @@
#endif
#include "onion.h"
#include "util.h"
#define MAX_ONION_SIZE MAX_DATA_SIZE
@ -36,6 +37,16 @@
#define SEND_2 ONION_SEND_2
#define SEND_1 ONION_SEND_1
/* Change symmetric keys every hour to make paths expire eventually. */
#define KEY_REFRESH_INTERVAL (60 * 60)
static void change_symmetric_key(Onion *onion)
{
if (is_timeout(onion->timestamp, KEY_REFRESH_INTERVAL)) {
new_symmetric_key(onion->secret_symmetric_key);
onion->timestamp = unix_time();
}
}
/* Create and send a onion packet.
*
* nodes is a list of 4 nodes, the packet will route through nodes 0, 1, 2 and the data
@ -126,6 +137,8 @@ static int handle_send_initial(void *object, IP_Port source, uint8_t *packet, ui
if (length <= 1 + SEND_1)
return 1;
change_symmetric_key(onion);
uint8_t plain[MAX_ONION_SIZE];
int len = decrypt_data(packet + 1 + crypto_box_NONCEBYTES, onion->dht->self_secret_key, packet + 1,
@ -170,6 +183,8 @@ static int handle_send_1(void *object, IP_Port source, uint8_t *packet, uint32_t
if (length <= 1 + SEND_2)
return 1;
change_symmetric_key(onion);
uint8_t plain[MAX_ONION_SIZE];
int len = decrypt_data(packet + 1 + crypto_box_NONCEBYTES, onion->dht->self_secret_key, packet + 1,
@ -217,6 +232,8 @@ static int handle_send_2(void *object, IP_Port source, uint8_t *packet, uint32_t
if (length <= 1 + SEND_3)
return 1;
change_symmetric_key(onion);
uint8_t plain[MAX_ONION_SIZE];
int len = decrypt_data(packet + 1 + crypto_box_NONCEBYTES, onion->dht->self_secret_key, packet + 1,
@ -263,6 +280,8 @@ static int handle_recv_3(void *object, IP_Port source, uint8_t *packet, uint32_t
if (length <= 1 + RETURN_3)
return 1;
change_symmetric_key(onion);
uint8_t plain[sizeof(IP_Port) + RETURN_2];
int len = decrypt_data_symmetric(onion->secret_symmetric_key, packet + 1, packet + 1 + crypto_secretbox_NONCEBYTES,
sizeof(IP_Port) + RETURN_2 + crypto_secretbox_MACBYTES, plain);
@ -295,6 +314,8 @@ static int handle_recv_2(void *object, IP_Port source, uint8_t *packet, uint32_t
if (length <= 1 + RETURN_2)
return 1;
change_symmetric_key(onion);
uint8_t plain[sizeof(IP_Port) + RETURN_1];
int len = decrypt_data_symmetric(onion->secret_symmetric_key, packet + 1, packet + 1 + crypto_secretbox_NONCEBYTES,
sizeof(IP_Port) + RETURN_1 + crypto_secretbox_MACBYTES, plain);
@ -327,6 +348,8 @@ static int handle_recv_1(void *object, IP_Port source, uint8_t *packet, uint32_t
if (length <= 1 + RETURN_1)
return 1;
change_symmetric_key(onion);
IP_Port send_to;
int len = decrypt_data_symmetric(onion->secret_symmetric_key, packet + 1, packet + 1 + crypto_secretbox_NONCEBYTES,
@ -358,6 +381,7 @@ Onion *new_onion(DHT *dht)
onion->dht = dht;
onion->net = dht->c->lossless_udp->net;
new_symmetric_key(onion->secret_symmetric_key);
onion->timestamp = unix_time();
networking_registerhandler(onion->net, NET_PACKET_ONION_SEND_INITIAL, &handle_send_initial, onion);
networking_registerhandler(onion->net, NET_PACKET_ONION_SEND_1, &handle_send_1, onion);

1
toxcore/onion.h
View File

@ -29,6 +29,7 @@ typedef struct {
DHT *dht;
Networking_Core *net;
uint8_t secret_symmetric_key[crypto_secretbox_KEYBYTES];
uint64_t timestamp;
} Onion;
#define ONION_RETURN_1 (crypto_secretbox_NONCEBYTES + sizeof(IP_Port) + crypto_secretbox_MACBYTES)