X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fprotocol_key.c;h=1d1bee15810b64b93dd973cfb1a2625027631f38;hb=8c10a4131f19dc27b0bc56ef48ae481d1fa03cb0;hp=a7de07e3465847e74defdb64b335b185490de33c;hpb=f6e87ab476a0faf8b124ecaaa27f967d825e6457;p=tinc

diff --git a/src/protocol_key.c b/src/protocol_key.c
index a7de07e3..1d1bee15 100644
--- a/src/protocol_key.c
+++ b/src/protocol_key.c
@@ -27,34 +27,34 @@
 #include "net.h"
 #include "netutl.h"
 #include "node.h"
-#include "prf.h"
 #include "protocol.h"
+#include "route.h"
 #include "sptps.h"
 #include "utils.h"
-#include "xalloc.h"
-
-static bool mykeyused = false;
+#include "compression.h"
 
 void send_key_changed(void) {
 #ifndef DISABLE_LEGACY
-	send_request(everyone, "%d %x %s", KEY_CHANGED, rand(), myself->name);
+	send_request(everyone, "%d %x %s", KEY_CHANGED, prng(UINT32_MAX), myself->name);
 
 	/* Immediately send new keys to directly connected nodes to keep UDP mappings alive */
 
-	for list_each(connection_t, c, connection_list)
+	for list_each(connection_t, c, &connection_list) {
 		if(c->edge && c->node && c->node->status.reachable && !c->node->status.sptps) {
 			send_ans_key(c->node);
 		}
+	}
 
 #endif
 
 	/* Force key exchange for connections using SPTPS */
 
 	if(experimental) {
-		for splay_each(node_t, n, node_tree)
+		for splay_each(node_t, n, &node_tree) {
 			if(n->status.reachable && n->status.validkey && n->status.sptps) {
 				sptps_force_kex(&n->sptps);
 			}
+		}
 	}
 }
 
@@ -99,10 +99,13 @@ static bool send_sptps_data_myself(void *handle, uint8_t type, const void *data,
 }
 
 static bool send_initial_sptps_data(void *handle, uint8_t type, const void *data, size_t len) {
+	(void)type;
 	node_t *to = handle;
 	to->sptps.send_data = send_sptps_data_myself;
-	char buf[len * 4 / 3 + 5];
-	b64encode(data, buf, len);
+
+	char buf[B64_SIZE(len)];
+	b64encode_tinc(data, buf, len);
+
 	return send_request(to->nexthop->connection, "%d %s %s %d %s", REQ_KEY, myself->name, to->name, REQ_KEY, buf);
 }
 
@@ -130,6 +133,8 @@ bool send_req_key(node_t *to) {
 /* REQ_KEY is overloaded to allow arbitrary requests to be routed between two nodes. */
 
 static bool req_key_ext_h(connection_t *c, const char *request, node_t *from, node_t *to, int reqno) {
+	(void)c;
+
 	/* If this is a SPTPS packet, see if sending UDP info helps.
 	   Note that we only do this if we're the destination or the static relay;
 	   otherwise every hop would initiate its own UDP info message, resulting in elevated chatter. */
@@ -141,17 +146,19 @@ static bool req_key_ext_h(connection_t *c, const char *request, node_t *from, no
 		/* This is a SPTPS data packet. */
 
 		char buf[MAX_STRING_SIZE];
-		int len;
+		size_t len;
 
-		if(sscanf(request, "%*d %*s %*s %*d " MAX_STRING, buf) != 1 || !(len = b64decode(buf, buf, strlen(buf)))) {
+		if(sscanf(request, "%*d %*s %*s %*d " MAX_STRING, buf) != 1 || !(len = b64decode_tinc(buf, buf, strlen(buf)))) {
 			logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s) to %s (%s): %s", "SPTPS_PACKET", from->name, from->hostname, to->name, to->hostname, "invalid SPTPS data");
 			return true;
 		}
 
 		if(to != myself) {
 			/* We don't just forward the request, because we want to use UDP if it's available. */
-			send_sptps_data(to, from, 0, buf, len);
-			try_tx(to, true);
+			if(forwarding_mode == FMODE_INTERNAL) {
+				send_sptps_data(to, from, 0, buf, len);
+				try_tx(to, true);
+			}
 		} else {
 			/* The packet is for us */
 			if(!sptps_receive_data(&from->sptps, buf, len)) {
@@ -224,9 +231,9 @@ static bool req_key_ext_h(connection_t *c, const char *request, node_t *from, no
 		}
 
 		char buf[MAX_STRING_SIZE];
-		int len;
+		size_t len;
 
-		if(sscanf(request, "%*d %*s %*s %*d " MAX_STRING, buf) != 1 || !(len = b64decode(buf, buf, strlen(buf)))) {
+		if(sscanf(request, "%*d %*s %*s %*d " MAX_STRING, buf) != 1 || !(len = b64decode_tinc(buf, buf, strlen(buf)))) {
 			logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "REQ_SPTPS_START", from->name, from->hostname, "invalid SPTPS data");
 			return true;
 		}
@@ -285,6 +292,12 @@ bool req_key_h(connection_t *c, const char *request) {
 	/* Check if this key request is for us */
 
 	if(to == myself) {                      /* Yes */
+		if(!from->status.reachable) {
+			logger(DEBUG_ALWAYS, LOG_ERR, "Got %s from %s (%s) origin %s which is not reachable",
+			       "REQ_KEY", c->name, c->hostname, from_name);
+			return true;
+		}
+
 		/* Is this an extended REQ_KEY message? */
 		if(experimental && reqno) {
 			return req_key_ext_h(c, request, from, to, reqno);
@@ -327,13 +340,13 @@ bool send_ans_key(node_t *to) {
 
 	randomize(key, keylen);
 
-	cipher_close(to->incipher);
-	digest_close(to->indigest);
+	cipher_free(&to->incipher);
+	digest_free(&to->indigest);
 
 	if(myself->incipher) {
-		to->incipher = cipher_open_by_nid(cipher_get_nid(myself->incipher));
+		to->incipher = cipher_alloc();
 
-		if(!to->incipher) {
+		if(!cipher_open_by_nid(to->incipher, cipher_get_nid(myself->incipher))) {
 			abort();
 		}
 
@@ -343,9 +356,11 @@ bool send_ans_key(node_t *to) {
 	}
 
 	if(myself->indigest) {
-		to->indigest = digest_open_by_nid(digest_get_nid(myself->indigest), digest_length(myself->indigest));
+		to->indigest = digest_alloc();
 
-		if(!to->indigest) {
+		if(!digest_open_by_nid(to->indigest,
+		                       digest_get_nid(myself->indigest),
+		                       digest_length(myself->indigest))) {
 			abort();
 		}
 
@@ -359,7 +374,6 @@ bool send_ans_key(node_t *to) {
 	bin2hex(key, key, keylen);
 
 	// Reset sequence number and late packet window
-	mykeyused = true;
 	to->received_seqno = 0;
 	to->received = 0;
 
@@ -369,11 +383,11 @@ bool send_ans_key(node_t *to) {
 
 	to->status.validkey_in = true;
 
-	return send_request(to->nexthop->connection, "%d %s %s %s %d %d %d %d", ANS_KEY,
+	return send_request(to->nexthop->connection, "%d %s %s %s %d %d %lu %d", ANS_KEY,
 	                    myself->name, to->name, key,
 	                    cipher_get_nid(to->incipher),
 	                    digest_get_nid(to->indigest),
-	                    (int)digest_length(to->indigest),
+	                    (unsigned long)digest_length(to->indigest),
 	                    to->incompression);
 #endif
 }
@@ -384,10 +398,12 @@ bool ans_key_h(connection_t *c, const char *request) {
 	char key[MAX_STRING_SIZE];
 	char address[MAX_STRING_SIZE] = "";
 	char port[MAX_STRING_SIZE] = "";
-	int cipher, digest, maclength, compression;
+	int cipher, digest;
+	unsigned long maclength;
+	int compression;
 	node_t *from, *to;
 
-	if(sscanf(request, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d %d "MAX_STRING" "MAX_STRING,
+	if(sscanf(request, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %lu %d "MAX_STRING" "MAX_STRING,
 	                from_name, to_name, key, &cipher, &digest, &maclength,
 	                &compression, address, port) < 7) {
 		logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ANS_KEY", c->name,
@@ -444,16 +460,57 @@ bool ans_key_h(connection_t *c, const char *request) {
 
 #ifndef DISABLE_LEGACY
 	/* Don't use key material until every check has passed. */
-	cipher_close(from->outcipher);
-	digest_close(from->outdigest);
+	cipher_free(&from->outcipher);
+	digest_free(&from->outdigest);
 #endif
 
 	if(!from->status.sptps) {
 		from->status.validkey = false;
 	}
 
-	if(compression < 0 || compression > 11) {
+	switch(compression) {
+	case COMPRESS_LZ4:
+#ifdef HAVE_LZ4
+		break;
+#else
 		logger(DEBUG_ALWAYS, LOG_ERR, "Node %s (%s) uses bogus compression level!", from->name, from->hostname);
+		logger(DEBUG_ALWAYS, LOG_ERR, "LZ4 compression is unavailable on this node.");
+		return true;
+#endif
+
+	case COMPRESS_LZO_HI:
+	case COMPRESS_LZO_LO:
+#ifdef HAVE_LZO
+		break;
+#else
+		logger(DEBUG_ALWAYS, LOG_ERR, "Node %s (%s) uses bogus compression level!", from->name, from->hostname);
+		logger(DEBUG_ALWAYS, LOG_ERR, "LZO compression is unavailable on this node.");
+		return true;
+#endif
+
+	case COMPRESS_ZLIB_9:
+	case COMPRESS_ZLIB_8:
+	case COMPRESS_ZLIB_7:
+	case COMPRESS_ZLIB_6:
+	case COMPRESS_ZLIB_5:
+	case COMPRESS_ZLIB_4:
+	case COMPRESS_ZLIB_3:
+	case COMPRESS_ZLIB_2:
+	case COMPRESS_ZLIB_1:
+#ifdef HAVE_ZLIB
+		break;
+#else
+		logger(DEBUG_ALWAYS, LOG_ERR, "Node %s (%s) uses bogus compression level!", from->name, from->hostname);
+		logger(DEBUG_ALWAYS, LOG_ERR, "ZLIB compression is unavailable on this node.");
+		return true;
+#endif
+
+	case COMPRESS_NONE:
+		break;
+
+	default:
+		logger(DEBUG_ALWAYS, LOG_ERR, "Node %s (%s) uses bogus compression level!", from->name, from->hostname);
+		logger(DEBUG_ALWAYS, LOG_ERR, "Compression level %i is unrecognized by this node.", compression);
 		return true;
 	}
 
@@ -462,8 +519,8 @@ bool ans_key_h(connection_t *c, const char *request) {
 	/* SPTPS or old-style key exchange? */
 
 	if(from->status.sptps) {
-		char buf[strlen(key)];
-		int len = b64decode(key, buf, strlen(key));
+		uint8_t buf[strlen(key)];
+		size_t len = b64decode_tinc(key, buf, strlen(key));
 
 		if(!len || !sptps_receive_data(&from->sptps, buf, len)) {
 			/* Uh-oh. It might be that the tunnel is stuck in some corrupted state,
@@ -499,7 +556,10 @@ bool ans_key_h(connection_t *c, const char *request) {
 	/* Check and lookup cipher and digest algorithms */
 
 	if(cipher) {
-		if(!(from->outcipher = cipher_open_by_nid(cipher))) {
+		from->outcipher = cipher_alloc();
+
+		if(!cipher_open_by_nid(from->outcipher, cipher)) {
+			cipher_free(&from->outcipher);
 			logger(DEBUG_ALWAYS, LOG_ERR, "Node %s (%s) uses unknown cipher!", from->name, from->hostname);
 			return false;
 		}
@@ -508,7 +568,10 @@ bool ans_key_h(connection_t *c, const char *request) {
 	}
 
 	if(digest) {
-		if(!(from->outdigest = digest_open_by_nid(digest, maclength))) {
+		from->outdigest = digest_alloc();
+
+		if(!digest_open_by_nid(from->outdigest, digest, maclength)) {
+			digest_free(&from->outdigest);
 			logger(DEBUG_ALWAYS, LOG_ERR, "Node %s (%s) uses unknown digest!", from->name, from->hostname);
 			return false;
 		}
@@ -523,7 +586,7 @@ bool ans_key_h(connection_t *c, const char *request) {
 
 	/* Process key */
 
-	int keylen = hex2bin(key, key, sizeof(key));
+	size_t keylen = hex2bin(key, key, sizeof(key));
 
 	if(keylen != (from->outcipher ? cipher_keylength(from->outcipher) : 1)) {
 		logger(DEBUG_ALWAYS, LOG_ERR, "Node %s (%s) uses wrong keylength!", from->name, from->hostname);