int keylifetime = 0;
int keyexpires = 0;
-EVP_CIPHER_CTX packet_ctx;
static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS];
static void send_udppacket(node_t *, vpn_packet_t *);
route(n, packet);
}
+static bool try_mac(const node_t *n, const vpn_packet_t *inpkt)
+{
+ unsigned char hmac[EVP_MAX_MD_SIZE];
+
+ if(!n->indigest || !n->inmaclength || !n->inkey || inpkt->len < sizeof inpkt->seqno + n->inmaclength)
+ return false;
+
+ HMAC(n->indigest, n->inkey, n->inkeylength, (unsigned char *) &inpkt->seqno, inpkt->len - n->inmaclength, (unsigned char *)hmac, NULL);
+
+ return !memcmp(hmac, (char *) &inpkt->seqno + inpkt->len - n->inmaclength, n->inmaclength);
+}
+
static void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
{
vpn_packet_t pkt1, pkt2;
cp();
+ if(!n->inkey) {
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got packet from %s (%s) but he hasn't got our key yet"),
+ n->name, n->hostname);
+ return;
+ }
+
/* Check packet length */
- if(inpkt->len < sizeof(inpkt->seqno) + myself->maclength) {
+ if(inpkt->len < sizeof(inpkt->seqno) + n->inmaclength) {
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got too short packet from %s (%s)"),
n->name, n->hostname);
return;
/* Check the message authentication code */
- if(myself->digest && myself->maclength) {
- inpkt->len -= myself->maclength;
- HMAC(myself->digest, myself->key, myself->keylength,
+ if(n->indigest && n->inmaclength) {
+ inpkt->len -= n->inmaclength;
+ HMAC(n->indigest, n->inkey, n->inkeylength,
(unsigned char *) &inpkt->seqno, inpkt->len, (unsigned char *)hmac, NULL);
- if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, myself->maclength)) {
+ if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, n->inmaclength)) {
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"),
n->name, n->hostname);
return;
/* Decrypt the packet */
- if(myself->cipher) {
+ if(n->incipher) {
outpkt = pkt[nextpkt++];
- if(!EVP_DecryptInit_ex(&packet_ctx, NULL, NULL, NULL, NULL)
- || !EVP_DecryptUpdate(&packet_ctx, (unsigned char *) &outpkt->seqno, &outlen,
+ if(!EVP_DecryptInit_ex(&n->inctx, NULL, NULL, NULL, NULL)
+ || !EVP_DecryptUpdate(&n->inctx, (unsigned char *) &outpkt->seqno, &outlen,
(unsigned char *) &inpkt->seqno, inpkt->len)
- || !EVP_DecryptFinal_ex(&packet_ctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) {
+ || !EVP_DecryptFinal_ex(&n->inctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) {
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s): %s"),
n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
return;
/* Decompress the packet */
- if(myself->compression) {
+ if(n->incompression) {
outpkt = pkt[nextpkt++];
- if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, myself->compression)) < 0) {
+ if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, n->incompression)) < 0) {
ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while uncompressing packet from %s (%s)"),
n->name, n->hostname);
return;
n->name, n->hostname);
if(!n->status.waitingforkey)
- send_req_key(n->nexthop->connection, myself, n);
+ send_req_key(n);
n->status.waitingforkey = true;
return;
}
- if(!n->minmtu && (inpkt->data[12] | inpkt->data[13])) {
+ if(n->options & OPTION_PMTU_DISCOVERY && !n->minmtu && (inpkt->data[12] | inpkt->data[13])) {
ifdebug(TRAFFIC) logger(LOG_INFO,
_("No minimum MTU established yet for %s (%s), forwarding via TCP"),
n->name, n->hostname);
send_tcppacket(n->nexthop->connection, origpkt);
+
+ return;
}
origlen = inpkt->len;
/* Compress the packet */
- if(n->compression) {
+ if(n->outcompression) {
outpkt = pkt[nextpkt++];
- if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->compression)) < 0) {
+ if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->outcompression)) < 0) {
ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while compressing packet to %s (%s)"),
n->name, n->hostname);
return;
/* Encrypt the packet */
- if(n->cipher) {
+ if(n->outcipher) {
outpkt = pkt[nextpkt++];
- if(!EVP_EncryptInit_ex(&n->packet_ctx, NULL, NULL, NULL, NULL)
- || !EVP_EncryptUpdate(&n->packet_ctx, (unsigned char *) &outpkt->seqno, &outlen,
+ if(!EVP_EncryptInit_ex(&n->outctx, NULL, NULL, NULL, NULL)
+ || !EVP_EncryptUpdate(&n->outctx, (unsigned char *) &outpkt->seqno, &outlen,
(unsigned char *) &inpkt->seqno, inpkt->len)
- || !EVP_EncryptFinal_ex(&n->packet_ctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) {
+ || !EVP_EncryptFinal_ex(&n->outctx, (unsigned char *) &outpkt->seqno + outlen, &outpad)) {
ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s): %s"),
n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL));
goto end;
/* Add the message authentication code */
- if(n->digest && n->maclength) {
- HMAC(n->digest, n->key, n->keylength, (unsigned char *) &inpkt->seqno,
+ if(n->outdigest && n->outmaclength) {
+ HMAC(n->outdigest, n->outkey, n->outkeylength, (unsigned char *) &inpkt->seqno,
inpkt->len, (unsigned char *) &inpkt->seqno + inpkt->len, NULL);
- inpkt->len += n->maclength;
+ inpkt->len += n->outmaclength;
}
/* Determine which socket we have to use */
}
}
+static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) {
+ avl_node_t *node;
+ edge_t *e;
+ node_t *n = NULL;
+
+ for(node = edge_weight_tree->head; node; node = node->next) {
+ e = node->data;
+
+ if(sockaddrcmp_noport(from, &e->address))
+ continue;
+
+ if(!n)
+ n = e->to;
+
+ if(!try_mac(e->to, pkt))
+ continue;
+
+ n = e->to;
+ break;
+ }
+
+ return n;
+}
+
void handle_incoming_vpn_data(int sock)
{
vpn_packet_t pkt;
n = lookup_node_udp(&from);
if(!n) {
- hostname = sockaddr2hostname(&from);
- logger(LOG_WARNING, _("Received UDP packet from unknown source %s"),
- hostname);
- free(hostname);
- return;
+ n = try_harder(&from, &pkt);
+ if(n)
+ update_node_udp(n, &from);
+ else ifdebug(PROTOCOL) {
+ hostname = sockaddr2hostname(&from);
+ logger(LOG_WARNING, _("Received UDP packet from unknown source %s"), hostname);
+ free(hostname);
+ return;
+ }
+ else
+ return;
}
receive_udppacket(n, &pkt);