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Fix handling of initial datagram SPTPS packet.

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Only the very first packet of an SPTPS session should be send with REQ_KEY,
this signals the peer to abort any previous session and start a new one as
well.
This commit is contained in:
Guus Sliepen 2012-10-14 14:33:54 +02:00
parent ec1f7e525d
commit 44a24f63ac
3 changed files with 19 additions and 13 deletions
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13
src/net_packet.c
View file

@ -397,6 +397,7 @@ static void send_sptps_packet(node_t *n, vpn_packet_t *origpkt) {
if(!n->status.waitingforkey)
send_req_key(n);
else if(n->last_req_key + 10 < time(NULL)) {
logger(DEBUG_ALWAYS, LOG_DEBUG, "No key from %s after 10 seconds, restarting SPTPS", n->name);
sptps_stop(&n->sptps);
n->status.waitingforkey = false;
send_req_key(n);
@ -631,18 +632,20 @@ end:
bool send_sptps_data(void *handle, uint8_t type, const char *data, size_t len) {
node_t *to = handle;
if(type >= SPTPS_HANDSHAKE
|| ((myself->options | to->options) & OPTION_TCPONLY)
|| (type != PKT_PROBE && len > to->minmtu)) {
/* Send it via TCP if it is a handshake packet, TCPOnly is in use, or this packet is larger than the MTU. */
if(type >= SPTPS_HANDSHAKE || ((myself->options | to->options) & OPTION_TCPONLY) || (type != PKT_PROBE && len > to->minmtu)) {
char buf[len * 4 / 3 + 5];
b64encode(data, buf, len);
/* If no valid key is known yet, send the packets using ANS_KEY requests,
to ensure we get to learn the reflexive UDP address. */
if(!to->status.validkey)
return send_request(to->nexthop->connection, "%d %s %s %s -1 -1 -1 %d", ANS_KEY, myself->name, to->name, buf, myself->incompression);
else
return send_request(to->nexthop->connection, "%d %s %s %d %s", REQ_KEY, myself->name, to->name, type >= SPTPS_HANDSHAKE ? REQ_SPTPS : REQ_PACKET, buf);
return send_request(to->nexthop->connection, "%d %s %s %d %s", REQ_KEY, myself->name, to->name, REQ_SPTPS, buf);
}
/* Send the packet */
/* Otherwise, send the packet via UDP */
struct sockaddr *sa;
socklen_t sl;

1
src/protocol.h
View file

@ -47,7 +47,6 @@ typedef enum request_t {
CONTROL,
REQ_PUBKEY, ANS_PUBKEY,
REQ_SPTPS,
REQ_PACKET,
LAST /* Guardian for the highest request number */
} request_t;

18
src/protocol_key.c
View file

@ -102,6 +102,10 @@ bool send_req_key(node_t *to) {
send_request(to->nexthop->connection, "%d %s %s %d", REQ_KEY, myself->name, to->name, REQ_PUBKEY);
return true;
}
if(to->sptps.label)
logger(DEBUG_ALWAYS, LOG_DEBUG, "send_req_key(%s) called while sptps->label != NULL!", to->name);
char label[25 + strlen(myself->name) + strlen(to->name)];
snprintf(label, sizeof label, "tinc UDP key expansion %s %s", myself->name, to->name);
sptps_stop(&to->sptps);
@ -149,17 +153,17 @@ static bool req_key_ext_h(connection_t *c, const char *request, node_t *from, in
send_request(from->nexthop->connection, "%d %s %s %d", REQ_KEY, myself->name, from->name, REQ_PUBKEY);
return true;
}
}
case REQ_SPTPS: {
if(from->sptps.label)
logger(DEBUG_ALWAYS, LOG_DEBUG, "Got REQ_KEY from %s while we already started a SPTPS session!", from->name);
char buf[MAX_STRING_SIZE];
if(sscanf(request, "%*d %*s %*s %*d " MAX_STRING, buf) != 1) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "REQ_KEY", from->name, from->hostname, "invalid SPTPS data");
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "REQ_SPTPS_START", from->name, from->hostname, "invalid SPTPS data");
return true;
}
int len = b64decode(buf, buf, strlen(buf));
char label[25 + strlen(from->name) + strlen(myself->name)];
snprintf(label, sizeof label, "tinc UDP key expansion %s %s", from->name, myself->name);
sptps_stop(&from->sptps);
@ -171,15 +175,15 @@ static bool req_key_ext_h(connection_t *c, const char *request, node_t *from, in
return true;
}
case REQ_PACKET: {
case REQ_SPTPS: {
if(!from->status.validkey) {
logger(DEBUG_PROTOCOL, LOG_ERR, "Got REQ_PACKET from %s (%s) but we don't have a valid key yet", from->name, from->hostname);
logger(DEBUG_PROTOCOL, LOG_ERR, "Got REQ_SPTPS from %s (%s) but we don't have a valid key yet", from->name, from->hostname);
return true;
}
char buf[MAX_STRING_SIZE];
if(sscanf(request, "%*d %*s %*s %*d " MAX_STRING, buf) != 1) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "REQ_KEY", from->name, from->hostname, "invalid SPTPS data");
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "REQ_SPTPS", from->name, from->hostname, "invalid SPTPS data");
return true;
}
int len = b64decode(buf, buf, strlen(buf));