#include "edge.h"
#include "graph.h"
#include "logger.h"
+#include "meta.h"
#include "net.h"
#include "netutl.h"
#include "node.h"
#include "prf.h"
#include "protocol.h"
#include "rsa.h"
+#include "sptps.h"
#include "utils.h"
#include "xalloc.h"
bool send_id(connection_t *c) {
gettimeofday(&c->start, NULL);
- return send_request(c, "%d %s %d.%d", ID, myself->connection->name,
- myself->connection->protocol_major, myself->connection->protocol_minor);
+ int minor = 0;
+
+ if(experimental) {
+ if(c->config_tree && !read_ecdsa_public_key(c))
+ minor = 1;
+ else
+ minor = myself->connection->protocol_minor;
+ }
+
+ return send_request(c, "%d %s %d.%d", ID, myself->connection->name, myself->connection->protocol_major, minor);
}
bool id_h(connection_t *c, char *request) {
return send_ack(c);
}
+ if(!experimental)
+ c->protocol_minor = 0;
+
if(!c->config_tree) {
init_configuration(&c->config_tree);
c->name);
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;
}
c->allow_request = METAKEY;
- if(c->protocol_minor >= 2)
- return send_metakey_ec(c);
- else
- return send_metakey(c);
-}
-
-bool send_metakey_ec(connection_t *c) {
- if(!read_ecdsa_public_key(c))
- return false;
-
- logger(LOG_DEBUG, "Sending ECDH metakey to %s", c->name);
-
- size_t siglen = ecdsa_size(&myself->connection->ecdsa);
-
- char key[ECDH_SIZE];
- char sig[siglen];
-
- // TODO: include nonce? Use relevant parts of SSH or TLS protocol
-
- if(!ecdh_generate_public(&c->ecdh, key))
- return false;
-
- if(!ecdsa_sign(&myself->connection->ecdsa, key, ECDH_SIZE, sig))
- return false;
+ if(c->protocol_minor >= 2) {
+ c->allow_request = ACK;
+ char label[25 + strlen(myself->name) + strlen(c->name)];
- char out[MAX_STRING_SIZE];
+ if(c->outgoing)
+ snprintf(label, sizeof label, "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);
- bin2hex(key, out, ECDH_SIZE);
- bin2hex(sig, out + ECDH_SIZE * 2, siglen);
- out[(ECDH_SIZE + siglen) * 2] = 0;
-
- bool result = send_request(c, "%d %s", METAKEY, out);
+ return start_sptps(&c->sptps, c, c->outgoing, myself->connection->ecdsa, c->ecdsa, label, sizeof label, send_meta_sptps, receive_meta_sptps);
+ } else {
+ return send_metakey(c);
+ }
}
bool send_metakey(connection_t *c) {
- size_t len = rsa_size(&c->rsa);
- char key[len];
- char enckey[len];
- char hexkey[2 * len + 1];
-
if(!read_rsa_public_key(c))
return false;
if(!digest_open_sha1(&c->outdigest, -1))
return false;
+ size_t len = rsa_size(&c->rsa);
+ char key[len];
+ char enckey[len];
+ char hexkey[2 * len + 1];
+
/* Create a random key */
randomize(key, len);
ifdebug(SCARY_THINGS) {
bin2hex(key, hexkey, len);
- hexkey[len * 2] = '\0';
logger(LOG_DEBUG, "Generated random meta key (unencrypted): %s", hexkey);
}
/* Convert the encrypted random data to a hexadecimal formatted string */
bin2hex(enckey, hexkey, len);
- hexkey[len * 2] = '\0';
/* Send the meta key */
return result;
}
-static bool metakey_ec_h(connection_t *c, const char *request) {
- size_t siglen = ecdsa_size(&c->ecdsa);
- char in[MAX_STRING_SIZE];
- char key[MAX_STRING_SIZE];
- char sig[siglen];
-
- logger(LOG_DEBUG, "Got ECDH metakey from %s", c->name);
-
- if(sscanf(request, "%*d " MAX_STRING, in) != 1) {
- logger(LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
- return false;
- }
-
- if(strlen(in) != (ECDH_SIZE + siglen) * 2) {
- logger(LOG_ERR, "Possible intruder %s (%s): %s %d != %d", c->name, c->hostname, "wrong keylength", strlen(in) / 2, (ECDH_SIZE + siglen));
- return false;
- }
-
- hex2bin(in, key, ECDH_SIZE);
- hex2bin(in + ECDH_SIZE * 2, sig, siglen);
-
- if(!ecdsa_verify(&c->ecdsa, key, ECDH_SIZE, sig)) {
- logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "invalid ECDSA signature");
- return false;
- }
-
- char shared[ECDH_SHARED_SIZE * 2 + 1];
-
- if(!ecdh_compute_shared(&c->ecdh, key, shared))
- return false;
-
- /* Update our crypto end */
-
- if(!cipher_open_by_name(&c->incipher, "aes-256-ofb"))
- return false;
- if(!digest_open_by_name(&c->indigest, "sha512", -1))
- return false;
- if(!cipher_open_by_name(&c->outcipher, "aes-256-ofb"))
- return false;
- if(!digest_open_by_name(&c->outdigest, "sha512", -1))
- return false;
-
- size_t mykeylen = cipher_keylength(&c->incipher);
- size_t hiskeylen = cipher_keylength(&c->outcipher);
-
- char *mykey;
- char *hiskey;
- char *seed;
-
- if(strcmp(myself->name, c->name) < 0) {
- mykey = key;
- hiskey = key + mykeylen * 2;
- xasprintf(&seed, "tinc TCP key expansion %s %s", myself->name, c->name);
- } else {
- mykey = key + hiskeylen * 2;
- hiskey = key;
- xasprintf(&seed, "tinc TCP key expansion %s %s", c->name, myself->name);
- }
-
- if(!prf(shared, ECDH_SHARED_SIZE, seed, strlen(seed), key, hiskeylen * 2 + mykeylen * 2))
- return false;
-
- free(seed);
-
- bin2hex(shared, shared, ECDH_SHARED_SIZE);
- shared[ECDH_SHARED_SIZE * 2] = 0;
- logger(LOG_DEBUG, "Shared secret is %s", shared);
-
- cipher_set_key(&c->incipher, mykey, true);
- digest_set_key(&c->indigest, mykey + mykeylen, mykeylen);
-
- cipher_set_key(&c->outcipher, hiskey, false);
- digest_set_key(&c->outdigest, hiskey + hiskeylen, hiskeylen);
-
- c->status.decryptin = true;
- c->status.encryptout = true;
- c->allow_request = CHALLENGE;
-
- return send_challenge(c);
-}
-
bool metakey_h(connection_t *c, char *request) {
- if(c->protocol_minor >= 2)
- return metakey_ec_h(c, request);
-
char hexkey[MAX_STRING_SIZE];
int cipher, digest, maclength, compression;
size_t len = rsa_size(&myself->connection->rsa);
return false;
}
+ /* Convert the challenge from hexadecimal back to binary */
+
+ int inlen = hex2bin(hexkey, enckey, sizeof enckey);
+
/* Check if the length of the meta key is all right */
- if(strlen(hexkey) != len * 2) {
+ if(inlen != len) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
return false;
}
- /* Convert the challenge from hexadecimal back to binary */
-
- hex2bin(hexkey, enckey, len);
-
/* Decrypt the meta key */
if(!rsa_private_decrypt(&myself->connection->rsa, enckey, len, key)) {
ifdebug(SCARY_THINGS) {
bin2hex(key, hexkey, len);
- hexkey[len * 2] = '\0';
logger(LOG_DEBUG, "Received random meta key (unencrypted): %s", hexkey);
}
}
bool send_challenge(connection_t *c) {
- size_t len = c->protocol_minor >= 2 ? ECDH_SIZE : rsa_size(&c->rsa);
+ size_t len = rsa_size(&c->rsa);
char buffer[len * 2 + 1];
if(!c->hischallenge)
/* Convert to hex */
bin2hex(c->hischallenge, buffer, len);
- buffer[len * 2] = '\0';
/* Send the challenge */
bool challenge_h(connection_t *c, char *request) {
char buffer[MAX_STRING_SIZE];
- size_t len = c->protocol_minor >= 2 ? ECDH_SIZE : rsa_size(&myself->connection->rsa);
+ size_t len = rsa_size(&myself->connection->rsa);
size_t digestlen = digest_length(&c->indigest);
char digest[digestlen];
return false;
}
+ /* Convert the challenge from hexadecimal back to binary */
+
+ int inlen = hex2bin(buffer, buffer, sizeof buffer);
+
/* Check if the length of the challenge is all right */
- if(strlen(buffer) != len * 2) {
+ if(inlen != len) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge length");
return false;
}
- /* Convert the challenge from hexadecimal back to binary */
-
- hex2bin(buffer, buffer, len);
-
c->allow_request = CHAL_REPLY;
/* Calculate the hash from the challenge we received */
/* Convert the hash to a hexadecimal formatted string */
bin2hex(digest, buffer, digestlen);
- buffer[digestlen * 2] = '\0';
/* Send the reply */
return false;
}
+ /* Convert the hash to binary format */
+
+ int inlen = hex2bin(hishash, hishash, sizeof hishash);
+
/* Check if the length of the hash is all right */
- if(strlen(hishash) != digest_length(&c->outdigest) * 2) {
+ if(inlen != digest_length(&c->outdigest)) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
return false;
}
- /* Convert the hash to binary format */
-
- hex2bin(hishash, hishash, digest_length(&c->outdigest));
/* Verify the hash */
- if(!digest_verify(&c->outdigest, c->hischallenge, c->protocol_minor >= 2 ? ECDH_SIZE : rsa_size(&c->rsa), hishash)) {
+ if(!digest_verify(&c->outdigest, c->hischallenge, rsa_size(&c->rsa), hishash)) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
return false;
}
return send_ack(c);
}
+static bool send_upgrade(connection_t *c) {
+ /* Special case when protocol_minor is 1: the other end is ECDSA capable,
+ * but doesn't know our key yet. So send it now. */
+
+ char *pubkey = ecdsa_get_base64_public_key(&myself->connection->ecdsa);
+
+ if(!pubkey)
+ return false;
+
+ bool result = send_request(c, "%d %s", ACK, pubkey);
+ free(pubkey);
+ return result;
+}
+
bool send_ack(connection_t *c) {
+ if(c->protocol_minor == 1)
+ return send_upgrade(c);
+
/* ACK message contains rest of the information the other end needs
to create node_t and edge_t structures. */
}
}
+static bool upgrade_h(connection_t *c, char *request) {
+ char pubkey[MAX_STRING_SIZE];
+
+ if(sscanf(request, "%*d " MAX_STRING, pubkey) != 1) {
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name, c->hostname);
+ return false;
+ }
+
+ if(ecdsa_active(&c->ecdsa) || read_ecdsa_public_key(c)) {
+ logger(LOG_INFO, "Already have ECDSA public key from %s (%s), not upgrading.", c->name, c->hostname);
+ return false;
+ }
+
+ logger(LOG_INFO, "Got ECDSA public key from %s (%s), upgrading!", c->name, c->hostname);
+ append_config_file(c->name, "ECDSAPublicKey", pubkey);
+ c->allow_request = TERMREQ;
+ return send_termreq(c);
+}
+
bool ack_h(connection_t *c, char *request) {
+ if(c->protocol_minor == 1)
+ return upgrade_h(c, request);
+
char hisport[MAX_STRING_SIZE];
char *hisaddress;
int weight, mtu;
if(tunnelserver)
send_add_edge(c, c->edge);
else
- send_add_edge(broadcast, c->edge);
+ send_add_edge(everyone, c->edge);
/* Run MST and SSSP algorithms */
projects / tinc / blobdiff