/*
protocol_key.c -- handle the meta-protocol, key exchange
Copyright (C) 1999-2005 Ivo Timmermans,
- 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2011 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "utils.h"
#include "xalloc.h"
-bool mykeyused = false;
+static bool mykeyused = false;
-bool send_key_changed()
-{
- cp();
+void send_key_changed(void) {
+ avl_node_t *node;
+ connection_t *c;
- /* Only send this message if some other daemon requested our key previously.
- This reduces unnecessary key_changed broadcasts.
- */
+ send_request(broadcast, "%d %x %s", KEY_CHANGED, rand(), myself->name);
- if(!mykeyused)
- return true;
+ /* Immediately send new keys to directly connected nodes to keep UDP mappings alive */
- return send_request(broadcast, "%d %x %s", KEY_CHANGED, rand(), myself->name);
+ for(node = connection_tree->head; node; node = node->next) {
+ c = node->data;
+ if(c->status.active && c->node && c->node->status.reachable)
+ send_ans_key(c->node);
+ }
}
-bool key_changed_h(connection_t *c)
-{
+bool key_changed_h(connection_t *c) {
char name[MAX_STRING_SIZE];
node_t *n;
- cp();
-
if(sscanf(c->buffer, "%*d %*x " MAX_STRING, name) != 1) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "KEY_CHANGED",
c->name, c->hostname);
return false;
}
+ if(!check_id(name)) {
+ logger(LOG_ERR, "Got bad %s from %s (%s): %s", "KEY_CHANGED", c->name, c->hostname, "invalid name");
+ return false;
+ }
+
if(seen_request(c->buffer))
return true;
n = lookup_node(name);
if(!n) {
- logger(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"),
+ logger(LOG_ERR, "Got %s from %s (%s) origin %s which does not exist",
"KEY_CHANGED", c->name, c->hostname, name);
- return false;
+ return true;
}
n->status.validkey = false;
- n->status.waitingforkey = false;
+ n->last_req_key = 0;
/* Tell the others */
return true;
}
-bool send_req_key(node_t *to)
-{
- cp();
-
+bool send_req_key(node_t *to) {
return send_request(to->nexthop->connection, "%d %s %s", REQ_KEY, myself->name, to->name);
}
-bool req_key_h(connection_t *c)
-{
+bool req_key_h(connection_t *c) {
char from_name[MAX_STRING_SIZE];
char to_name[MAX_STRING_SIZE];
node_t *from, *to;
- cp();
-
if(sscanf(c->buffer, "%*d " MAX_STRING " " MAX_STRING, from_name, to_name) != 2) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY", c->name,
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "REQ_KEY", c->name,
c->hostname);
return false;
}
+ if(!check_id(from_name) || !check_id(to_name)) {
+ logger(LOG_ERR, "Got bad %s from %s (%s): %s", "REQ_KEY", c->name, c->hostname, "invalid name");
+ return false;
+ }
+
from = lookup_node(from_name);
if(!from) {
- logger(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"),
+ logger(LOG_ERR, "Got %s from %s (%s) origin %s which does not exist in our connection list",
"REQ_KEY", c->name, c->hostname, from_name);
- return false;
+ return true;
}
to = lookup_node(to_name);
if(!to) {
- logger(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"),
+ logger(LOG_ERR, "Got %s from %s (%s) destination %s which does not exist in our connection list",
"REQ_KEY", c->name, c->hostname, to_name);
- return false;
+ return true;
}
/* Check if this key request is for us */
send_ans_key(from);
} else {
if(tunnelserver)
- return false;
+ return true;
if(!to->status.reachable) {
- logger(LOG_WARNING, _("Got %s from %s (%s) destination %s which is not reachable"),
+ logger(LOG_WARNING, "Got %s from %s (%s) destination %s which is not reachable",
"REQ_KEY", c->name, c->hostname, to_name);
return true;
}
return true;
}
-bool send_ans_key(node_t *to)
-{
- char *key;
-
- cp();
-
+bool send_ans_key(node_t *to) {
// Set key parameters
to->incipher = myself->incipher;
to->inkeylength = myself->inkeylength;
// Reset sequence number and late packet window
mykeyused = true;
to->received_seqno = 0;
- memset(to->late, 0, sizeof(to->late));
+ if(replaywin) memset(to->late, 0, replaywin);
// Convert to hexadecimal and send
- key = alloca(2 * to->inkeylength + 1);
+ char key[2 * to->inkeylength + 1];
bin2hex(to->inkey, key, to->inkeylength);
key[to->inkeylength * 2] = '\0';
to->incompression);
}
-bool ans_key_h(connection_t *c)
-{
+bool ans_key_h(connection_t *c) {
char from_name[MAX_STRING_SIZE];
char to_name[MAX_STRING_SIZE];
char key[MAX_STRING_SIZE];
+ char address[MAX_STRING_SIZE] = "";
+ char port[MAX_STRING_SIZE] = "";
int cipher, digest, maclength, compression;
node_t *from, *to;
- cp();
-
- if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d %d",
+ if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d %d "MAX_STRING" "MAX_STRING,
from_name, to_name, key, &cipher, &digest, &maclength,
- &compression) != 7) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY", c->name,
+ &compression, address, port) < 7) {
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "ANS_KEY", c->name,
c->hostname);
return false;
}
+ if(!check_id(from_name) || !check_id(to_name)) {
+ logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ANS_KEY", c->name, c->hostname, "invalid name");
+ return false;
+ }
+
from = lookup_node(from_name);
if(!from) {
- logger(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"),
+ logger(LOG_ERR, "Got %s from %s (%s) origin %s which does not exist in our connection list",
"ANS_KEY", c->name, c->hostname, from_name);
- return false;
+ return true;
}
to = lookup_node(to_name);
if(!to) {
- logger(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"),
+ logger(LOG_ERR, "Got %s from %s (%s) destination %s which does not exist in our connection list",
"ANS_KEY", c->name, c->hostname, to_name);
- return false;
+ return true;
}
/* Forward it if necessary */
if(to != myself) {
if(tunnelserver)
- return false;
+ return true;
if(!to->status.reachable) {
- logger(LOG_WARNING, _("Got %s from %s (%s) destination %s which is not reachable"),
+ logger(LOG_WARNING, "Got %s from %s (%s) destination %s which is not reachable",
"ANS_KEY", c->name, c->hostname, to_name);
return true;
}
+ if(!*address && from->address.sa.sa_family != AF_UNSPEC) {
+ char *address, *port;
+ ifdebug(PROTOCOL) logger(LOG_DEBUG, "Appending reflexive UDP address to ANS_KEY from %s to %s", from->name, to->name);
+ sockaddr2str(&from->address, &address, &port);
+ send_request(to->nexthop->connection, "%s %s %s", c->buffer, address, port);
+ free(address);
+ free(port);
+ return true;
+ }
+
return send_request(to->nexthop->connection, "%s", c->buffer);
}
/* Update our copy of the origin's packet key */
from->outkey = xrealloc(from->outkey, strlen(key) / 2);
-
- from->outkey = xstrdup(key);
from->outkeylength = strlen(key) / 2;
hex2bin(key, from->outkey, from->outkeylength);
- from->status.waitingforkey = false;
/* Check and lookup cipher and digest algorithms */
if(cipher) {
from->outcipher = EVP_get_cipherbynid(cipher);
if(!from->outcipher) {
- logger(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name,
+ logger(LOG_ERR, "Node %s (%s) uses unknown cipher!", from->name,
from->hostname);
- return false;
+ return true;
}
if(from->outkeylength != from->outcipher->key_len + from->outcipher->iv_len) {
- logger(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name,
+ logger(LOG_ERR, "Node %s (%s) uses wrong keylength!", from->name,
from->hostname);
- return false;
+ return true;
}
} else {
from->outcipher = NULL;
from->outdigest = EVP_get_digestbynid(digest);
if(!from->outdigest) {
- logger(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name,
+ logger(LOG_ERR, "Node %s (%s) uses unknown digest!", from->name,
from->hostname);
- return false;
+ return true;
}
if(from->outmaclength > from->outdigest->md_size || from->outmaclength < 0) {
- logger(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"),
+ logger(LOG_ERR, "Node %s (%s) uses bogus MAC length!",
from->name, from->hostname);
- return false;
+ return true;
}
} else {
from->outdigest = NULL;
}
if(compression < 0 || compression > 11) {
- logger(LOG_ERR, _("Node %s (%s) uses bogus compression level!"), from->name, from->hostname);
- return false;
+ logger(LOG_ERR, "Node %s (%s) uses bogus compression level!", from->name, from->hostname);
+ return true;
}
from->outcompression = compression;
if(from->outcipher)
if(!EVP_EncryptInit_ex(&from->outctx, from->outcipher, NULL, (unsigned char *)from->outkey, (unsigned char *)from->outkey + from->outcipher->key_len)) {
- logger(LOG_ERR, _("Error during initialisation of key from %s (%s): %s"),
+ logger(LOG_ERR, "Error during initialisation of key from %s (%s): %s",
from->name, from->hostname, ERR_error_string(ERR_get_error(), NULL));
- return false;
+ return true;
}
from->status.validkey = true;
from->sent_seqno = 0;
- if(from->options & OPTION_PMTU_DISCOVERY && !from->mtuprobes)
+ if(*address && *port) {
+ ifdebug(PROTOCOL) logger(LOG_DEBUG, "Using reflexive UDP address from %s: %s port %s", from->name, address, port);
+ sockaddr_t sa = str2sockaddr(address, port);
+ update_node_udp(from, &sa);
+ }
+
+ if(from->options & OPTION_PMTU_DISCOVERY && !from->mtuevent)
send_mtu_probe(from);
return true;
projects / oweals / tinc.git / blobdiff