/*
protocol_auth.c -- handle the meta-protocol, authentication
Copyright (C) 1999-2005 Ivo Timmermans,
- 2000-2017 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2022 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 "control.h"
#include "control_common.h"
#include "cipher.h"
-#include "crypto.h"
-#include "device.h"
#include "digest.h"
#include "ecdsa.h"
#include "edge.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 "random.h"
+#include "compression.h"
+#include "proxy.h"
+#include "address_cache.h"
#include "ed25519/sha512.h"
#include "keys.h"
+/* If nonzero, use null ciphers and skip all key exchanges. */
+bool bypass_security = false;
+
int invitation_lifetime;
ecdsa_t *invitation_key = NULL;
return true;
}
- case PROXY_SOCKS4: {
- if(c->address.sa.sa_family != AF_INET) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Cannot connect to an IPv6 host through a SOCKS 4 proxy!");
- return false;
- }
-
- char s4req[9 + (proxyuser ? strlen(proxyuser) : 0)];
- s4req[0] = 4;
- s4req[1] = 1;
- memcpy(s4req + 2, &c->address.in.sin_port, 2);
- memcpy(s4req + 4, &c->address.in.sin_addr, 4);
-
- if(proxyuser) {
- memcpy(s4req + 8, proxyuser, strlen(proxyuser));
- }
-
- s4req[sizeof(s4req) - 1] = 0;
- c->tcplen = 8;
- return send_meta(c, s4req, sizeof(s4req));
- }
-
+ case PROXY_SOCKS4:
case PROXY_SOCKS5: {
- int len = 3 + 6 + (c->address.sa.sa_family == AF_INET ? 4 : 16);
- c->tcplen = 2;
-
- if(proxypass) {
- len += 3 + strlen(proxyuser) + strlen(proxypass);
- }
-
- char s5req[len];
- int i = 0;
- s5req[i++] = 5;
- s5req[i++] = 1;
-
- if(proxypass) {
- s5req[i++] = 2;
- s5req[i++] = 1;
- s5req[i++] = strlen(proxyuser);
- memcpy(s5req + i, proxyuser, strlen(proxyuser));
- i += strlen(proxyuser);
- s5req[i++] = strlen(proxypass);
- memcpy(s5req + i, proxypass, strlen(proxypass));
- i += strlen(proxypass);
- c->tcplen += 2;
- } else {
- s5req[i++] = 0;
- }
-
- s5req[i++] = 5;
- s5req[i++] = 1;
- s5req[i++] = 0;
-
- if(c->address.sa.sa_family == AF_INET) {
- s5req[i++] = 1;
- memcpy(s5req + i, &c->address.in.sin_addr, 4);
- i += 4;
- memcpy(s5req + i, &c->address.in.sin_port, 2);
- i += 2;
- c->tcplen += 10;
- } else if(c->address.sa.sa_family == AF_INET6) {
- s5req[i++] = 3;
- memcpy(s5req + i, &c->address.in6.sin6_addr, 16);
- i += 16;
- memcpy(s5req + i, &c->address.in6.sin6_port, 2);
- i += 2;
- c->tcplen += 22;
- } else {
- logger(DEBUG_ALWAYS, LOG_ERR, "Address family %x not supported for SOCKS 5 proxies!", c->address.sa.sa_family);
- return false;
- }
-
- if(i > len) {
- abort();
- }
-
- return send_meta(c, s5req, sizeof(s5req));
+ size_t reqlen = socks_req_len(proxytype, &c->address);
+ uint8_t *req = alloca(reqlen);
+ c->tcplen = create_socks_req(proxytype, req, &c->address);
+ return c->tcplen ? send_meta(c, req, reqlen) : false;
}
case PROXY_SOCKS4A:
case PROXY_EXEC:
return true;
+ case PROXY_NONE:
default:
logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type");
return false;
int minor = 0;
if(experimental) {
- if(c->outgoing && !read_ecdsa_public_key(&c->ecdsa, &c->config_tree, c->name)) {
+ if(c->outgoing && !ecdsa_active(c->ecdsa) && !(c->ecdsa = read_ecdsa_public_key(&c->config_tree, c->name))) {
minor = 1;
} else {
minor = myself->connection->protocol_minor;
logger(DEBUG_CONNECTIONS, LOG_INFO, "Key successfully received from %s (%s)", c->name, c->hostname);
+ if(!c->node) {
+ c->node = lookup_node(c->name);
+ }
+
+ if(!c->node) {
+ c->node = new_node(c->name);
+ c->node->connection = c;
+ node_add(c->node);
+ }
+
+ if(!c->node->address_cache) {
+ c->node->address_cache = open_address_cache(c->node);
+ }
+
+ add_recent_address(c->node->address_cache, &c->address);
+
// Call invitation-accepted script
environment_t env;
char *address, *port;
// Recover the filename from the cookie and the key
char *fingerprint = ecdsa_get_base64_public_key(invitation_key);
- char hashbuf[18 + strlen(fingerprint)];
+ const size_t hashbuflen = 18 + strlen(fingerprint);
+ char *hashbuf = alloca(hashbuflen);
char cookie[64];
memcpy(hashbuf, data, 18);
- memcpy(hashbuf + 18, fingerprint, sizeof(hashbuf) - 18);
- sha512(hashbuf, sizeof(hashbuf), cookie);
- b64encode_urlsafe(cookie, cookie, 18);
+ memcpy(hashbuf + 18, fingerprint, hashbuflen - 18);
+ sha512(hashbuf, hashbuflen, cookie);
+ b64encode_tinc_urlsafe(cookie, cookie, 18);
free(fingerprint);
char filename[PATH_MAX], usedname[PATH_MAX];
// Read the new node's Name from the file
char buf[1024] = "";
- fgets(buf, sizeof(buf), f);
+
+ if(!fgets(buf, sizeof(buf), f)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not read invitation file %s\n", cookie);
+ fclose(f);
+ return false;
+ }
+
size_t buflen = strlen(buf);
// Strip whitespace at the end
sptps_send_record(&c->sptps, 0, buf, result);
}
+ if(!feof(f)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not read invitation file %s\n", cookie);
+ fclose(f);
+ return false;
+ }
+
sptps_send_record(&c->sptps, 1, buf, 0);
fclose(f);
unlink(usedname);
if(bypass_security) {
if(!c->config_tree) {
- init_configuration(&c->config_tree);
+ c->config_tree = create_configuration();
}
c->allow_request = ACK;
}
if(!c->config_tree) {
- init_configuration(&c->config_tree);
+ c->config_tree = create_configuration();
if(!read_host_config(c->config_tree, c->name, false)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname, c->name);
return false;
}
- if(experimental) {
- read_ecdsa_public_key(&c->ecdsa, &c->config_tree, c->name);
+ if(experimental && !ecdsa_active(c->ecdsa)) {
+ c->ecdsa = read_ecdsa_public_key(&c->config_tree, c->name);
}
/* Ignore failures if no key known yet */
if(c->protocol_minor >= 2) {
c->allow_request = ACK;
- char label[25 + strlen(myself->name) + strlen(c->name)];
+
+ const size_t labellen = 25 + strlen(myself->name) + strlen(c->name);
+ char *label = alloca(labellen);
if(c->outgoing) {
- snprintf(label, sizeof(label), "tinc TCP key expansion %s %s", myself->name, c->name);
+ snprintf(label, labellen, "tinc TCP key expansion %s %s", myself->name, c->name);
} else {
- snprintf(label, sizeof(label), "tinc TCP key expansion %s %s", c->name, myself->name);
+ snprintf(label, labellen, "tinc TCP key expansion %s %s", c->name, myself->name);
}
- return sptps_start(&c->sptps, c, c->outgoing, false, myself->connection->ecdsa, c->ecdsa, label, sizeof(label), send_meta_sptps, receive_meta_sptps);
+ return sptps_start(&c->sptps, c, c->outgoing, false, myself->connection->ecdsa, c->ecdsa, label, labellen, send_meta_sptps, receive_meta_sptps);
} else {
return send_metakey(c);
}
}
#ifndef DISABLE_LEGACY
+static const char *get_cipher_name(cipher_t *cipher) {
+ size_t keylen = cipher_keylength(cipher);
+
+ if(keylen <= 16) {
+ return "aes-128-cfb";
+ } else if(keylen <= 24) {
+ return "aes-192-cfb";
+ } else {
+ return "aes-256-cfb";
+ }
+}
+
bool send_metakey(connection_t *c) {
- if(!myself->connection->rsa) {
+ if(!myself->connection->legacy) {
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->rsa, c->config_tree, c->name)) {
+ rsa_t *rsa = read_rsa_public_key(c->config_tree, c->name);
+
+ if(!rsa) {
return false;
}
+ legacy_ctx_t *ctx = new_legacy_ctx(rsa);
+
/* We need to use a stream mode for the meta protocol. Use AES for this,
but try to match the key size with the one from the cipher selected
by Cipher.
*/
- int keylen = cipher_keylength(myself->incipher);
+ const char *cipher_name = get_cipher_name(myself->incipher);
- if(keylen <= 16) {
- c->outcipher = cipher_open_by_name("aes-128-cfb");
- } else if(keylen <= 24) {
- c->outcipher = cipher_open_by_name("aes-192-cfb");
- } else {
- c->outcipher = cipher_open_by_name("aes-256-cfb");
- }
-
- if(!c) {
- return false;
- }
-
- c->outbudget = cipher_budget(c->outcipher);
-
- if(!(c->outdigest = digest_open_by_name("sha256", -1))) {
+ if(!init_crypto_by_name(&ctx->out, cipher_name, "sha256")) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher or digest to %s (%s)", c->name, c->hostname);
+ free_legacy_ctx(ctx);
return false;
}
- const size_t len = rsa_size(c->rsa);
- char key[len];
- char enckey[len];
- char hexkey[2 * len + 1];
+ const size_t len = rsa_size(ctx->rsa);
+ const size_t hexkeylen = HEX_SIZE(len);
+ char *key = alloca(len);
+ char *enckey = alloca(len);
+ char *hexkey = alloca(hexkeylen);
/* Create a random key */
key[0] &= 0x7F;
- if(!cipher_set_key_from_rsa(c->outcipher, key, len, true)) {
+ if(!cipher_set_key_from_rsa(&ctx->out.cipher, key, len, true)) {
+ free_legacy_ctx(ctx);
+ memzero(key, len);
return false;
}
if(debug_level >= DEBUG_SCARY_THINGS) {
bin2hex(key, hexkey, len);
logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Generated random meta key (unencrypted): %s", hexkey);
+ memzero(hexkey, hexkeylen);
}
/* Encrypt the random data
with a length equal to that of the modulus of the RSA key.
*/
- if(!rsa_public_encrypt(c->rsa, key, len, enckey)) {
+ bool encrypted = rsa_public_encrypt(ctx->rsa, key, len, enckey);
+ memzero(key, len);
+
+ if(!encrypted) {
+ free_legacy_ctx(ctx);
logger(DEBUG_ALWAYS, LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
return false;
}
+ free_legacy_ctx(c->legacy);
+ c->legacy = ctx;
+
/* Convert the encrypted random data to a hexadecimal formatted string */
bin2hex(enckey, hexkey, len);
/* 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,
- c->outcompression, hexkey);
+ cipher_get_nid(&c->legacy->out.cipher),
+ digest_get_nid(&c->legacy->out.digest), c->outmaclength,
+ COMPRESS_NONE, hexkey);
c->status.encryptout = true;
return result;
}
bool metakey_h(connection_t *c, const char *request) {
- if(!myself->connection->rsa) {
+ if(!myself->connection->legacy || !c->legacy) {
return false;
}
char hexkey[MAX_STRING_SIZE];
- int cipher, digest, maclength, compression;
- const size_t len = rsa_size(myself->connection->rsa);
- char enckey[len];
- char key[len];
+ int cipher, digest;
+ const size_t len = rsa_size(myself->connection->legacy->rsa);
+ char *enckey = alloca(len);
+ char *key = alloca(len);
- if(sscanf(request, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, hexkey) != 5) {
+ if(sscanf(request, "%*d %d %d %*d %*d " MAX_STRING, &cipher, &digest, hexkey) != 3) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
return false;
}
+ if(!cipher || !digest) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): cipher %d, digest %d", c->name, c->hostname, cipher, digest);
+ return false;
+ }
+
/* Convert the challenge from hexadecimal back to binary */
- size_t inlen = hex2bin(hexkey, enckey, sizeof(enckey));
+ size_t inlen = hex2bin(hexkey, enckey, len);
/* Check if the length of the meta key is all right */
/* Decrypt the meta key */
- if(!rsa_private_decrypt(myself->connection->rsa, enckey, len, key)) {
+ if(!rsa_private_decrypt(myself->connection->legacy->rsa, enckey, len, key)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
return false;
}
if(debug_level >= DEBUG_SCARY_THINGS) {
bin2hex(key, hexkey, len);
logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Received random meta key (unencrypted): %s", hexkey);
+ // Hopefully the user knew what he was doing leaking session keys into logs. We'll do the right thing here anyway.
+ memzero(hexkey, HEX_SIZE(len));
}
/* Check and lookup cipher and digest algorithms */
- 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 {
- logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "null cipher");
+ if(!init_crypto_by_nid(&c->legacy->in, cipher, digest)) {
+ memzero(key, len);
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher or digest from %s (%s)", c->name, c->hostname);
return false;
}
- c->inbudget = cipher_budget(c->incipher);
+ bool key_set = cipher_set_key_from_rsa(&c->legacy->in.cipher, key, len, false);
+ memzero(key, len);
- 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 {
- logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "null digest");
+ if(!key_set) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error setting RSA key for %s (%s)", c->name, c->hostname);
return false;
}
}
bool send_challenge(connection_t *c) {
- const size_t len = rsa_size(c->rsa);
- char buffer[len * 2 + 1];
+ const size_t len = rsa_size(c->legacy->rsa);
+ char *buffer = alloca(len * 2 + 1);
c->hischallenge = xrealloc(c->hischallenge, len);
}
bool challenge_h(connection_t *c, const char *request) {
- if(!myself->connection->rsa) {
+ if(!myself->connection->legacy) {
return false;
}
char buffer[MAX_STRING_SIZE];
- const size_t len = rsa_size(myself->connection->rsa);
+ const size_t len = rsa_size(myself->connection->legacy->rsa);
if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name, c->hostname);
}
bool send_chal_reply(connection_t *c) {
- const size_t len = rsa_size(myself->connection->rsa);
- size_t digestlen = digest_length(c->indigest);
- char digest[digestlen * 2 + 1];
+ const size_t len = rsa_size(myself->connection->legacy->rsa);
+ size_t digestlen = digest_length(&c->legacy->in.digest);
+ char *digest = alloca(digestlen * 2 + 1);
/* Calculate the hash from the challenge we received */
- if(!digest_create(c->indigest, c->mychallenge, len, digest)) {
+ if(!digest_create(&c->legacy->in.digest, c->mychallenge, len, digest)) {
return false;
}
/* Check if the length of the hash is all right */
- if(inlen != digest_length(c->outdigest)) {
+ if(inlen != digest_length(&c->legacy->out.digest)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
return false;
}
/* Verify the hash */
- if(!digest_verify(c->outdigest, c->hischallenge, rsa_size(c->rsa), hishash)) {
+ if(!digest_verify(&c->legacy->out.digest, c->hischallenge, rsa_size(c->legacy->rsa), hishash)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
return false;
}
/* Estimate weight */
gettimeofday(&now, NULL);
- c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000;
+ c->estimated_weight = (int)((now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000);
/* Check some options */
}
if(!get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight)) {
- get_config_int(lookup_config(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));
+ return send_request(c, "%d %s %d %x", ACK, myport.udp, c->estimated_weight, (c->options & 0xffffff) | (experimental ? (PROT_MINOR << 24) : 0));
}
static void send_everything(connection_t *c) {
}
if(tunnelserver) {
- for splay_each(subnet_t, s, myself->subnet_tree) {
+ for splay_each(subnet_t, s, &myself->subnet_tree) {
send_add_subnet(c, s);
}
return;
}
- for splay_each(node_t, n, node_tree) {
- for splay_each(subnet_t, s, n->subnet_tree) {
+ for splay_each(node_t, n, &node_tree) {
+ for splay_each(subnet_t, s, &n->subnet_tree) {
send_add_subnet(c, s);
}
- for splay_each(edge_t, e, n->edge_tree) {
+ for splay_each(edge_t, e, &n->edge_tree) {
send_add_edge(c, e);
}
}
return false;
}
- if(ecdsa_active(c->ecdsa) || read_ecdsa_public_key(&c->ecdsa, &c->config_tree, c->name)) {
+ if(ecdsa_active(c->ecdsa) || (c->ecdsa = read_ecdsa_public_key(&c->config_tree, c->name))) {
char *knownkey = ecdsa_get_base64_public_key(c->ecdsa);
bool different = strcmp(knownkey, pubkey);
free(knownkey);
n = lookup_node(c->name);
if(!n) {
- n = new_node();
- n->name = xstrdup(c->name);
+ n = new_node(c->name);
node_add(n);
} else {
if(n->connection) {
n->mtu = mtu;
}
- if(get_config_int(lookup_config(config_tree, "PMTU"), &mtu) && mtu < n->mtu) {
+ if(get_config_int(lookup_config(&config_tree, "PMTU"), &mtu) && mtu < n->mtu) {
n->mtu = mtu;
}
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 {
- sockaddr_setport(&local_sa, myport);
+ sockaddr_setport(&local_sa, myport.udp);
c->edge->local_address = local_sa;
}
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