X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol_auth.c;h=0a7ad1ca383ea8c0bf21cd44df7c8e762a7f59dc;hp=21cfc52ed7f7aa170464e8c16261d52ebba7b8f9;hb=d4410d0cce40929db9a0ce7042ef962f1867234d;hpb=0b8b23e0dd7219344543f135ca0aeba8a4a42d48

diff --git a/src/protocol_auth.c b/src/protocol_auth.c
index 21cfc52e..0a7ad1ca 100644
--- a/src/protocol_auth.c
+++ b/src/protocol_auth.c
@@ -1,7 +1,7 @@
 /*
     protocol_auth.c -- handle the meta-protocol, authentication
     Copyright (C) 1999-2005 Ivo Timmermans,
-                  2000-2012 Guus Sliepen <guus@tinc-vpn.org>
+                  2000-2014 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
@@ -26,21 +26,29 @@
 #include "control_common.h"
 #include "cipher.h"
 #include "crypto.h"
+#include "device.h"
 #include "digest.h"
+#include "ecdsa.h"
 #include "edge.h"
 #include "graph.h"
 #include "logger.h"
 #include "meta.h"
+#include "names.h"
 #include "net.h"
 #include "netutl.h"
 #include "node.h"
 #include "prf.h"
 #include "protocol.h"
 #include "rsa.h"
+#include "script.h"
 #include "sptps.h"
 #include "utils.h"
 #include "xalloc.h"
 
+#include "ed25519/sha512.h"
+
+ecdsa_t *invitation_key = NULL;
+
 static bool send_proxyrequest(connection_t *c) {
 	switch(proxytype) {
 		case PROXY_HTTP: {
@@ -109,7 +117,7 @@ static bool send_proxyrequest(connection_t *c) {
 				i += 2;
 				c->tcplen += 22;
 			} else {
-				logger(DEBUG_ALWAYS, LOG_ERR, "Address family %hx not supported for SOCKS 5 proxies!", c->address.sa.sa_family);
+				logger(DEBUG_ALWAYS, LOG_ERR, "Address family %x not supported for SOCKS 5 proxies!", c->address.sa.sa_family);
 				return false;
 			}
 			if(i > len)
@@ -133,19 +141,146 @@ bool send_id(connection_t *c) {
 	int minor = 0;
 
 	if(experimental) {
-		if(c->config_tree && !read_ecdsa_public_key(c))
+		if(c->outgoing && !read_ecdsa_public_key(c))
 			minor = 1;
 		else
 			minor = myself->connection->protocol_minor;
 	}
 
-	if(proxytype)
+	if(proxytype && c->outgoing)
 		if(!send_proxyrequest(c))
 			return false;
 
 	return send_request(c, "%d %s %d.%d", ID, myself->connection->name, myself->connection->protocol_major, minor);
 }
 
+static bool finalize_invitation(connection_t *c, const char *data, uint16_t len) {
+	if(strchr(data, '\n')) {
+		logger(DEBUG_ALWAYS, LOG_ERR, "Received invalid key from invited node %s (%s)!\n", c->name, c->hostname);
+		return false;
+	}
+
+	// Create a new host config file
+	char filename[PATH_MAX];
+	snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
+	if(!access(filename, F_OK)) {
+		logger(DEBUG_ALWAYS, LOG_ERR, "Host config file for %s (%s) already exists!\n", c->name, c->hostname);
+		return false;
+	}
+
+	FILE *f = fopen(filename, "w");
+	if(!f) {
+		logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to create %s: %s\n", filename, strerror(errno));
+		return false;
+	}
+
+	fprintf(f, "Ed25519PublicKey = %s\n", data);
+	fclose(f);
+
+	logger(DEBUG_CONNECTIONS, LOG_INFO, "Key succesfully received from %s (%s)", c->name, c->hostname);
+
+	// Call invitation-accepted script
+	char *envp[7] = {NULL};
+	char *address, *port;
+
+	xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
+        xasprintf(&envp[1], "DEVICE=%s", device ? : "");
+        xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
+        xasprintf(&envp[3], "NODE=%s", c->name);
+	sockaddr2str(&c->address, &address, &port);
+	xasprintf(&envp[4], "REMOTEADDRESS=%s", address);
+	xasprintf(&envp[5], "NAME=%s", myself->name);
+
+	execute_script("invitation-accepted", envp);
+
+	for(int i = 0; envp[i] && i < 7; i++)
+		free(envp[i]);
+
+	sptps_send_record(&c->sptps, 2, data, 0);
+	return true;
+}
+
+static bool receive_invitation_sptps(void *handle, uint8_t type, const void *data, uint16_t len) {
+	connection_t *c = handle;
+
+	if(type == 128)
+		return true;
+
+	if(type == 1 && c->status.invitation_used)
+		return finalize_invitation(c, data, len);
+
+	if(type != 0 || len != 18 || c->status.invitation_used)
+		return false;
+
+	// Recover the filename from the cookie and the key
+	char *fingerprint = ecdsa_get_base64_public_key(invitation_key);
+	char hashbuf[18 + strlen(fingerprint)];
+	char cookie[64];
+	memcpy(hashbuf, data, 18);
+	memcpy(hashbuf + 18, fingerprint, sizeof hashbuf - 18);
+	sha512(hashbuf, sizeof hashbuf, cookie);
+	b64encode_urlsafe(cookie, cookie, 18);
+	free(fingerprint);
+
+	char filename[PATH_MAX], usedname[PATH_MAX];
+	snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "%s", confbase, cookie);
+	snprintf(usedname, sizeof usedname, "%s" SLASH "invitations" SLASH "%s.used", confbase, cookie);
+
+	// Atomically rename the invitation file
+	if(rename(filename, usedname)) {
+		if(errno == ENOENT)
+			logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s tried to use non-existing invitation %s\n", c->hostname, cookie);
+		else
+			logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to rename invitation %s\n", cookie);
+		return false;
+	}
+
+	// Open the renamed file
+	FILE *f = fopen(usedname, "r");
+	if(!f) {
+		logger(DEBUG_ALWAYS, LOG_ERR, "Error trying to open invitation %s\n", cookie);
+		return false;
+	}
+
+	// Read the new node's Name from the file
+	char buf[1024];
+	fgets(buf, sizeof buf, f);
+	if(*buf)
+		buf[strlen(buf) - 1] = 0;
+
+	len = strcspn(buf, " \t=");
+	char *name = buf + len;
+	name += strspn(name, " \t");
+	if(*name == '=') {
+		name++;
+		name += strspn(name, " \t");
+	}
+	buf[len] = 0;
+
+	if(!*buf || !*name || strcasecmp(buf, "Name") || !check_id(name)) {
+		logger(DEBUG_ALWAYS, LOG_ERR, "Invalid invitation file %s\n", cookie);
+		fclose(f);
+		return false;
+	}
+
+	free(c->name);
+	c->name = xstrdup(name);
+
+	// Send the node the contents of the invitation file
+	rewind(f);
+	size_t result;
+	while((result = fread(buf, 1, sizeof buf, f)))
+		sptps_send_record(&c->sptps, 0, buf, result);
+	sptps_send_record(&c->sptps, 1, buf, 0);
+	fclose(f);
+	unlink(usedname);
+
+	c->status.invitation_used = true;
+
+	logger(DEBUG_CONNECTIONS, LOG_INFO, "Invitation %s succesfully sent to %s (%s)", cookie, c->name, c->hostname);
+	return true;
+}
+
 bool id_h(connection_t *c, const char *request) {
 	char name[MAX_STRING_SIZE];
 
@@ -160,14 +295,39 @@ bool id_h(connection_t *c, const char *request) {
 	if(name[0] == '^' && !strcmp(name + 1, controlcookie)) {
 		c->status.control = true;
 		c->allow_request = CONTROL;
-		c->last_ping_time = time(NULL) + 3600;
+		c->last_ping_time = now.tv_sec + 3600;
 
-	        free(c->name);
-                c->name = xstrdup("<control>");
+		free(c->name);
+		c->name = xstrdup("<control>");
 
 		return send_request(c, "%d %d %d", ACK, TINC_CTL_VERSION_CURRENT, getpid());
 	}
 
+	if(name[0] == '?') {
+		if(!invitation_key) {
+			logger(DEBUG_ALWAYS, LOG_ERR, "Got invitation from %s but we don't have an invitation key", c->hostname);
+			return false;
+		}
+
+		c->ecdsa = ecdsa_set_base64_public_key(name + 1);
+		if(!c->ecdsa) {
+			logger(DEBUG_ALWAYS, LOG_ERR, "Got bad invitation from %s", c->hostname);
+			return false;
+		}
+
+		c->status.invitation = true;
+		char *mykey = ecdsa_get_base64_public_key(invitation_key);
+		if(!mykey)
+			return false;
+		if(!send_request(c, "%d %s", ACK, mykey))
+			return false;
+		free(mykey);
+
+		c->protocol_minor = 2;
+
+		return sptps_start(&c->sptps, c, false, false, invitation_key, c->ecdsa, "tinc invitation", 15, send_meta_sptps, receive_invitation_sptps);
+	}
+
 	/* Check if identity is a valid name */
 
 	if(!check_id(name)) {
@@ -194,7 +354,7 @@ bool id_h(connection_t *c, const char *request) {
 
 	if(c->protocol_major != myself->connection->protocol_major) {
 		logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) uses incompatible version %d.%d",
-			   c->name, c->hostname, c->protocol_major, c->protocol_minor);
+			c->name, c->hostname, c->protocol_major, c->protocol_minor);
 		return false;
 	}
 
@@ -216,13 +376,20 @@ bool id_h(connection_t *c, const char *request) {
 			return false;
 		}
 
-		if(experimental && c->protocol_minor >= 2) {
-			if(!read_ecdsa_public_key(c))
-				return false;
-		}
-	} else {
-		if(c->protocol_minor && !ecdsa_active(&c->ecdsa))
-			c->protocol_minor = 1;
+		if(experimental)
+			read_ecdsa_public_key(c);
+			/* Ignore failures if no key known yet */
+	}
+
+	if(c->protocol_minor && !ecdsa_active(c->ecdsa))
+		c->protocol_minor = 1;
+
+	/* Forbid version rollback for nodes whose Ed25519 key we know */
+
+	if(ecdsa_active(c->ecdsa) && c->protocol_minor < 1) {
+		logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) tries to roll back protocol version to %d.%d",
+			c->name, c->hostname, c->protocol_major, c->protocol_minor);
+		return false;
 	}
 
 	c->allow_request = METAKEY;
@@ -243,16 +410,24 @@ bool id_h(connection_t *c, const char *request) {
 }
 
 bool send_metakey(connection_t *c) {
+#ifdef DISABLE_LEGACY
+	return false;
+#else
+	if(!myself->connection->rsa) {
+		logger(DEBUG_CONNECTIONS, LOG_ERR, "Peer %s (%s) uses legacy protocol which we don't support", c->name, c->hostname);
+		return false;
+	}
+
 	if(!read_rsa_public_key(c))
 		return false;
 
-	if(!cipher_open_blowfish_ofb(&c->outcipher))
+	if(!(c->outcipher = cipher_open_blowfish_ofb()))
 		return false;
-	
-	if(!digest_open_sha1(&c->outdigest, -1))
+
+	if(!(c->outdigest = digest_open_sha1(-1)))
 		return false;
 
-	size_t len = rsa_size(&c->rsa);
+	const size_t len = rsa_size(c->rsa);
 	char key[len];
 	char enckey[len];
 	char hexkey[2 * len + 1];
@@ -273,7 +448,8 @@ bool send_metakey(connection_t *c) {
 
 	key[0] &= 0x7F;
 
-	cipher_set_key_from_rsa(&c->outcipher, key, len, true);
+	if(!cipher_set_key_from_rsa(c->outcipher, key, len, true))
+		return false;
 
 	if(debug_level >= DEBUG_SCARY_THINGS) {
 		bin2hex(key, hexkey, len);
@@ -287,7 +463,7 @@ bool send_metakey(connection_t *c) {
 	   with a length equal to that of the modulus of the RSA key.
 	 */
 
-	if(!rsa_public_encrypt(&c->rsa, key, len, enckey)) {
+	if(!rsa_public_encrypt(c->rsa, key, len, enckey)) {
 		logger(DEBUG_ALWAYS, LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
 		return false;
 	}
@@ -299,18 +475,25 @@ bool send_metakey(connection_t *c) {
 	/* Send the meta key */
 
 	bool result = send_request(c, "%d %d %d %d %d %s", METAKEY,
-			 cipher_get_nid(&c->outcipher),
-			 digest_get_nid(&c->outdigest), c->outmaclength,
+			 cipher_get_nid(c->outcipher),
+			 digest_get_nid(c->outdigest), c->outmaclength,
 			 c->outcompression, hexkey);
-	
+
 	c->status.encryptout = true;
 	return result;
+#endif
 }
 
 bool metakey_h(connection_t *c, const char *request) {
+#ifdef DISABLE_LEGACY
+	return false;
+#else
+	if(!myself->connection->rsa)
+		return false;
+
 	char hexkey[MAX_STRING_SIZE];
 	int cipher, digest, maclength, compression;
-	size_t len = rsa_size(&myself->connection->rsa);
+	const size_t len = rsa_size(myself->connection->rsa);
 	char enckey[len];
 	char key[len];
 
@@ -332,7 +515,7 @@ bool metakey_h(connection_t *c, const char *request) {
 
 	/* Decrypt the meta key */
 
-	if(!rsa_private_decrypt(&myself->connection->rsa, enckey, len, key)) {
+	if(!rsa_private_decrypt(myself->connection->rsa, enckey, len, key)) {
 		logger(DEBUG_ALWAYS, LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
 		return false;
 	}
@@ -344,14 +527,22 @@ bool metakey_h(connection_t *c, const char *request) {
 
 	/* Check and lookup cipher and digest algorithms */
 
-	if(!cipher_open_by_nid(&c->incipher, cipher) || !cipher_set_key_from_rsa(&c->incipher, key, len, false)) {
-		logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
-		return false;
+	if(cipher) {
+		if(!(c->incipher = cipher_open_by_nid(cipher)) || !cipher_set_key_from_rsa(c->incipher, key, len, false)) {
+			logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
+			return false;
+		}
+	} else {
+		c->incipher = NULL;
 	}
 
-	if(!digest_open_by_nid(&c->indigest, digest, -1)) {
-		logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
-		return false;
+	if(digest) {
+		if(!(c->indigest = digest_open_by_nid(digest, -1))) {
+			logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
+			return false;
+		}
+	} else {
+		c->indigest = NULL;
 	}
 
 	c->status.decryptin = true;
@@ -359,10 +550,14 @@ bool metakey_h(connection_t *c, const char *request) {
 	c->allow_request = CHALLENGE;
 
 	return send_challenge(c);
+#endif
 }
 
 bool send_challenge(connection_t *c) {
-	size_t len = rsa_size(&c->rsa);
+#ifdef DISABLE_LEGACY
+	return false;
+#else
+	const size_t len = rsa_size(c->rsa);
 	char buffer[len * 2 + 1];
 
 	if(!c->hischallenge)
@@ -379,12 +574,19 @@ bool send_challenge(connection_t *c) {
 	/* Send the challenge */
 
 	return send_request(c, "%d %s", CHALLENGE, buffer);
+#endif
 }
 
 bool challenge_h(connection_t *c, const char *request) {
+#ifdef DISABLE_LEGACY
+	return false;
+#else
+	if(!myself->connection->rsa)
+		return false;
+
 	char buffer[MAX_STRING_SIZE];
-	size_t len = rsa_size(&myself->connection->rsa);
-	size_t digestlen = digest_length(&c->indigest);
+	const size_t len = rsa_size(myself->connection->rsa);
+	size_t digestlen = digest_length(c->indigest);
 	char digest[digestlen];
 
 	if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
@@ -403,11 +605,10 @@ bool challenge_h(connection_t *c, const char *request) {
 		return false;
 	}
 
-	c->allow_request = CHAL_REPLY;
-
 	/* Calculate the hash from the challenge we received */
 
-	digest_create(&c->indigest, buffer, len, digest);
+	if(!digest_create(c->indigest, buffer, len, digest))
+		return false;
 
 	/* Convert the hash to a hexadecimal formatted string */
 
@@ -415,10 +616,16 @@ bool challenge_h(connection_t *c, const char *request) {
 
 	/* Send the reply */
 
+	c->allow_request = CHAL_REPLY;
+
 	return send_request(c, "%d %s", CHAL_REPLY, buffer);
+#endif
 }
 
 bool chal_reply_h(connection_t *c, const char *request) {
+#ifdef DISABLE_LEGACY
+	return false;
+#else
 	char hishash[MAX_STRING_SIZE];
 
 	if(sscanf(request, "%*d " MAX_STRING, hishash) != 1) {
@@ -433,7 +640,7 @@ bool chal_reply_h(connection_t *c, const char *request) {
 
 	/* Check if the length of the hash is all right */
 
-	if(inlen != digest_length(&c->outdigest)) {
+	if(inlen != digest_length(c->outdigest)) {
 		logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
 		return false;
 	}
@@ -441,7 +648,7 @@ bool chal_reply_h(connection_t *c, const char *request) {
 
 	/* Verify the hash */
 
-	if(!digest_verify(&c->outdigest, c->hischallenge, rsa_size(&c->rsa), hishash)) {
+	if(!digest_verify(c->outdigest, c->hischallenge, rsa_size(c->rsa), hishash)) {
 		logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
 		return false;
 	}
@@ -455,13 +662,17 @@ bool chal_reply_h(connection_t *c, const char *request) {
 	c->allow_request = ACK;
 
 	return send_ack(c);
+#endif
 }
 
 static bool send_upgrade(connection_t *c) {
-	/* Special case when protocol_minor is 1: the other end is ECDSA capable,
+#ifdef DISABLE_LEGACY
+	return false;
+#else
+	/* Special case when protocol_minor is 1: the other end is Ed25519 capable,
 	 * but doesn't know our key yet. So send it now. */
 
-	char *pubkey = ecdsa_get_base64_public_key(&myself->connection->ecdsa);
+	char *pubkey = ecdsa_get_base64_public_key(myself->connection->ecdsa);
 
 	if(!pubkey)
 		return false;
@@ -469,6 +680,7 @@ static bool send_upgrade(connection_t *c) {
 	bool result = send_request(c, "%d %s", ACK, pubkey);
 	free(pubkey);
 	return result;
+#endif
 }
 
 bool send_ack(connection_t *c) {
@@ -502,7 +714,8 @@ bool send_ack(connection_t *c) {
 	if(choice)
 		c->options |= OPTION_CLAMP_MSS;
 
-	get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight);
+	if(!get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight))
+		get_config_int(lookup_config(config_tree, "Weight"), &c->estimated_weight);
 
 	return send_request(c, "%d %s %d %x", ACK, myport, c->estimated_weight, (c->options & 0xffffff) | (experimental ? (PROT_MINOR << 24) : 0));
 }
@@ -510,6 +723,17 @@ bool send_ack(connection_t *c) {
 static void send_everything(connection_t *c) {
 	/* Send all known subnets and edges */
 
+	if(disablebuggypeers) {
+		static struct {
+			vpn_packet_t pkt;
+			char pad[MAXBUFSIZE - MAXSIZE];
+		} zeropkt;
+
+		memset(&zeropkt, 0, sizeof zeropkt);
+		zeropkt.pkt.len = MAXBUFSIZE;
+		send_tcppacket(c, &zeropkt.pkt);
+	}
+
 	if(tunnelserver) {
 		for splay_each(subnet_t, s, myself->subnet_tree)
 			send_add_subnet(c, s);
@@ -534,14 +758,30 @@ static bool upgrade_h(connection_t *c, const char *request) {
 		return false;
 	}
 
-	if(ecdsa_active(&c->ecdsa) || read_ecdsa_public_key(c)) {
-		logger(DEBUG_ALWAYS, LOG_INFO, "Already have ECDSA public key from %s (%s), not upgrading.", c->name, c->hostname);
+	if(ecdsa_active(c->ecdsa) || read_ecdsa_public_key(c)) {
+		char *knownkey = ecdsa_get_base64_public_key(c->ecdsa);
+		bool different = strcmp(knownkey, pubkey);
+		free(knownkey);
+		if(different) {
+			logger(DEBUG_ALWAYS, LOG_ERR, "Already have an Ed25519 public key from %s (%s) which is different from the one presented now!", c->name, c->hostname);
+			return false;
+		}
+		logger(DEBUG_ALWAYS, LOG_INFO, "Already have Ed25519 public key from %s (%s), ignoring.", c->name, c->hostname);
+		c->allow_request = TERMREQ;
+		return send_termreq(c);
+	}
+
+	c->ecdsa = ecdsa_set_base64_public_key(pubkey);
+	if(!c->ecdsa) {
+		logger(DEBUG_ALWAYS, LOG_INFO, "Got bad Ed25519 public key from %s (%s), not upgrading.", c->name, c->hostname);
 		return false;
 	}
 
-	logger(DEBUG_ALWAYS, LOG_INFO, "Got ECDSA public key from %s (%s), upgrading!", c->name, c->hostname);
-	append_config_file(c->name, "ECDSAPublicKey", pubkey);
+	logger(DEBUG_ALWAYS, LOG_INFO, "Got Ed25519 public key from %s (%s), upgrading!", c->name, c->hostname);
+	append_config_file(c->name, "Ed25519PublicKey", pubkey);
 	c->allow_request = TERMREQ;
+	if(c->outgoing)
+		c->outgoing->timeout = 0;
 	return send_termreq(c);
 }
 
@@ -614,7 +854,6 @@ bool ack_h(connection_t *c, const char *request) {
 	/* Activate this connection */
 
 	c->allow_request = ALL;
-	c->status.active = true;
 
 	logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection with %s (%s) activated", c->name,
 			   c->hostname);
@@ -631,6 +870,16 @@ bool ack_h(connection_t *c, const char *request) {
 	sockaddr2str(&c->address, &hisaddress, NULL);
 	c->edge->address = str2sockaddr(hisaddress, hisport);
 	free(hisaddress);
+	sockaddr_t local_sa;
+	socklen_t local_salen = sizeof local_sa;
+	if (getsockname(c->socket, &local_sa.sa, &local_salen) < 0)
+		logger(DEBUG_ALWAYS, LOG_WARNING, "Could not get local socket address for connection with %s", c->name);
+	else {
+		char *local_address;
+		sockaddr2str(&local_sa, &local_address, NULL);
+		c->edge->local_address = str2sockaddr(local_address, myport);
+		free(local_address);
+	}
 	c->edge->weight = (weight + c->estimated_weight) / 2;
 	c->edge->connection = c;
 	c->edge->options = c->options;