From af86a3226ea42375644b3f99c182c778d327de1e Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Sat, 20 Mar 2004 22:23:42 +0000 Subject: [PATCH] Revert Martin Kihlgren's patch, it doesn't work the way it should. --- src/graph.c | 21 ++++++++++++++-- src/net.h | 1 - src/net_packet.c | 63 ++++++++++++++++-------------------------------- src/net_setup.c | 2 -- src/node.c | 22 ----------------- src/node.h | 1 - 6 files changed, 40 insertions(+), 70 deletions(-) diff --git a/src/graph.c b/src/graph.c index 3870c70..3ed1d72 100644 --- a/src/graph.c +++ b/src/graph.c @@ -219,8 +219,25 @@ void sssp_bfs(void) e->to->via = indirect ? n->via : e->to; e->to->options = e->options; - if(sockaddrcmp(&e->to->address, &e->address)) - update_node_address(e->to, &e->address); + if(sockaddrcmp(&e->to->address, &e->address)) { + node = avl_unlink(node_udp_tree, e->to); + sockaddrfree(&e->to->address); + sockaddrcpy(&e->to->address, &e->address); + + if(e->to->hostname) + free(e->to->hostname); + + e->to->hostname = sockaddr2hostname(&e->to->address); + avl_insert_node(node_udp_tree, node); + + if(e->to->options & OPTION_PMTU_DISCOVERY) { + e->to->mtuprobes = 0; + e->to->minmtu = 0; + e->to->maxmtu = MTU; + if(e->to->status.validkey) + send_mtu_probe(e->to); + } + } node = avl_alloc_node(); node->data = e->to; diff --git a/src/net.h b/src/net.h index 90463eb..5b14553 100644 --- a/src/net.h +++ b/src/net.h @@ -122,7 +122,6 @@ extern listen_socket_t listen_socket[MAXSOCKETS]; extern int listen_sockets; extern int keyexpires; extern int keylifetime; -extern bool strictsource; extern bool do_prune; extern bool do_purge; extern char *myport; diff --git a/src/net_packet.c b/src/net_packet.c index ae5a840..255453e 100644 --- a/src/net_packet.c +++ b/src/net_packet.c @@ -54,7 +54,6 @@ int keylifetime = 0; int keyexpires = 0; -bool strictsource = true; 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]; @@ -168,25 +167,6 @@ static void receive_packet(node_t *n, vpn_packet_t *packet) route(n, packet); } -static bool authenticate_udppacket(node_t *n, vpn_packet_t *inpkt) { - char hmac[EVP_MAX_MD_SIZE]; - - if(inpkt->len < sizeof(inpkt->seqno) + (myself->digest ? myself->maclength : 0)) - return false; - - /* Check the message authentication code */ - - if(myself->digest && myself->maclength) { - HMAC(myself->digest, myself->key, myself->keylength, - (char *) &inpkt->seqno, inpkt->len - myself->maclength, hmac, NULL); - - if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len - myself->maclength, myself->maclength)) - return false; - } - - return true; -} - static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { vpn_packet_t pkt1, pkt2; @@ -194,17 +174,32 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) int nextpkt = 0; vpn_packet_t *outpkt = pkt[0]; int outlen, outpad; + char hmac[EVP_MAX_MD_SIZE]; int i; cp(); - if(!authenticate_udppacket(n, inpkt)) { - ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), - n->name, n->hostname); + /* Check packet length */ + + if(inpkt->len < sizeof(inpkt->seqno) + myself->maclength) { + ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got too short packet from %s (%s)"), + n->name, n->hostname); return; } - inpkt->len -= myself->digest ? myself->maclength : 0; + /* Check the message authentication code */ + + if(myself->digest && myself->maclength) { + inpkt->len -= myself->maclength; + HMAC(myself->digest, myself->key, myself->keylength, + (char *) &inpkt->seqno, inpkt->len, hmac, NULL); + + if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, myself->maclength)) { + ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), + n->name, n->hostname); + return; + } + } /* Decrypt the packet */ @@ -488,7 +483,6 @@ void handle_incoming_vpn_data(int sock) sockaddr_t from; socklen_t fromlen = sizeof(from); node_t *n; - static time_t lasttime = 0; cp(); @@ -503,25 +497,10 @@ void handle_incoming_vpn_data(int sock) n = lookup_node_udp(&from); - if(!n && !strictsource && myself->digest && myself->maclength && lasttime != now) { - avl_node_t *node; - - lasttime = now; - - for(node = node_tree->head; node; node = node->next) { - n = node->data; - - if(authenticate_udppacket(n, &pkt)) { - update_node_address(n, &from); - logger(LOG_DEBUG, _("Updated address of node %s to %s"), n->name, n->hostname); - break; - } - } - } - if(!n) { hostname = sockaddr2hostname(&from); - logger(LOG_WARNING, _("Received UDP packet from unknown source %s"), hostname); + logger(LOG_WARNING, _("Received UDP packet from unknown source %s"), + hostname); free(hostname); return; } diff --git a/src/net_setup.c b/src/net_setup.c index 502e7b2..aa2fbfb 100644 --- a/src/net_setup.c +++ b/src/net_setup.c @@ -343,8 +343,6 @@ bool setup_myself(void) get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames); - get_config_bool(lookup_config(config_tree, "StrictSource"), &strictsource); - /* Generate packet encryption key */ if(get_config_string diff --git a/src/node.c b/src/node.c index a9b8858..3519916 100644 --- a/src/node.c +++ b/src/node.c @@ -150,28 +150,6 @@ void node_del(node_t *n) avl_delete(node_udp_tree, n); } -void update_node_address(node_t *n, const sockaddr_t *address) { - avl_node_t *node; - - node = avl_unlink(node_udp_tree, n); - sockaddrfree(&n->address); - sockaddrcpy(&n->address, address); - - if(n->hostname) - free(n->hostname); - - n->hostname = sockaddr2hostname(&n->address); - avl_insert_node(node_udp_tree, node); - - if(n->options & OPTION_PMTU_DISCOVERY) { - n->mtuprobes = 0; - n->minmtu = 0; - n->maxmtu = MTU; - if(n->status.validkey) - send_mtu_probe(n); - } -} - node_t *lookup_node(char *name) { node_t n = {0}; diff --git a/src/node.h b/src/node.h index 935b9a3..dd9c7a1 100644 --- a/src/node.h +++ b/src/node.h @@ -90,7 +90,6 @@ extern node_t *new_node(void) __attribute__ ((__malloc__)); extern void free_node(node_t *); extern void node_add(node_t *); extern void node_del(node_t *); -extern void update_node_address(node_t *, const sockaddr_t *); extern node_t *lookup_node(char *); extern node_t *lookup_node_udp(const sockaddr_t *); extern void dump_nodes(void); -- 2.25.1