Import Upstream version 1.1~pre3

This commit is contained in:
Guus Sliepen 2019-08-26 13:44:49 +02:00
parent 02de1cd2f1
commit 34d5939212
136 changed files with 13943 additions and 4867 deletions

View file

@ -1,7 +1,7 @@
/*
protocol_auth.c -- handle the meta-protocol, authentication
Copyright (C) 1999-2005 Ivo Timmermans,
2000-2010 Guus Sliepen <guus@tinc-vpn.org>
2000-2012 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
@ -20,7 +20,6 @@
#include "system.h"
#include "splay_tree.h"
#include "conf.h"
#include "connection.h"
#include "control.h"
@ -31,15 +30,103 @@
#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"
static bool send_proxyrequest(connection_t *c) {
switch(proxytype) {
case PROXY_HTTP: {
char *host;
char *port;
sockaddr2str(&c->address, &host, &port);
send_request(c, "CONNECT %s:%s HTTP/1.1\r\n\r", host, port);
free(host);
free(port);
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_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 %hx not supported for SOCKS 5 proxies!", c->address.sa.sa_family);
return false;
}
if(i > len)
abort();
return send_meta(c, s5req, sizeof s5req);
}
case PROXY_SOCKS4A:
logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type not implemented yet");
return false;
case PROXY_EXEC:
return true;
default:
logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type");
return false;
}
}
bool send_id(connection_t *c) {
gettimeofday(&c->start, NULL);
@ -52,14 +139,18 @@ bool send_id(connection_t *c) {
minor = myself->connection->protocol_minor;
}
if(proxytype)
if(!send_proxyrequest(c))
return false;
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) {
bool id_h(connection_t *c, const char *request) {
char name[MAX_STRING_SIZE];
if(sscanf(request, "%*d " MAX_STRING " %d.%d", name, &c->protocol_major, &c->protocol_minor) < 2) {
logger(LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
c->hostname);
return false;
}
@ -70,13 +161,17 @@ bool id_h(connection_t *c, char *request) {
c->status.control = true;
c->allow_request = CONTROL;
c->last_ping_time = time(NULL) + 3600;
free(c->name);
c->name = xstrdup("<control>");
return send_request(c, "%d %d %d", ACK, TINC_CTL_VERSION_CURRENT, getpid());
}
/* Check if identity is a valid name */
if(!check_id(name)) {
logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ID", c->name,
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ID", c->name,
c->hostname, "invalid name");
return false;
}
@ -85,7 +180,7 @@ bool id_h(connection_t *c, char *request) {
if(c->outgoing) {
if(strcmp(c->name, name)) {
logger(LOG_ERR, "Peer %s is %s instead of %s", c->hostname, name,
logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s is %s instead of %s", c->hostname, name,
c->name);
return false;
}
@ -98,7 +193,7 @@ bool id_h(connection_t *c, char *request) {
/* Check if version matches */
if(c->protocol_major != myself->connection->protocol_major) {
logger(LOG_ERR, "Peer %s (%s) uses incompatible version %d.%d",
logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) uses incompatible version %d.%d",
c->name, c->hostname, c->protocol_major, c->protocol_minor);
return false;
}
@ -110,52 +205,41 @@ bool id_h(connection_t *c, char *request) {
return send_ack(c);
}
if(!c->config_tree) {
init_configuration(&c->config_tree);
if(!read_connection_config(c)) {
logger(LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname,
c->name);
return false;
}
if(experimental && c->protocol_minor >= 2)
if(!read_ecdsa_public_key(c))
return false;
} else {
if(!ecdsa_active(&c->ecdsa))
c->protocol_minor = 1;
}
if(!experimental)
c->protocol_minor = 0;
if(!c->config_tree) {
init_configuration(&c->config_tree);
if(!read_host_config(c->config_tree, c->name)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname, 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
if(c->protocol_minor >= 2) {
c->allow_request = ACK;
char label[25 + strlen(myself->name) + strlen(c->name)];
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);
return sptps_start(&c->sptps, c, c->outgoing, false, myself->connection->ecdsa, c->ecdsa, label, sizeof label, send_meta_sptps, receive_meta_sptps);
} else {
return send_metakey(c);
}
bool send_metakey_ec(connection_t *c) {
logger(LOG_DEBUG, "Sending ECDH metakey to %s", c->name);
size_t siglen = ecdsa_size(&myself->connection->ecdsa);
char key[(ECDH_SIZE + siglen) * 2 + 1];
// 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, key + ECDH_SIZE))
return false;
b64encode(key, key, ECDH_SIZE + siglen);
return send_request(c, "%d %s", METAKEY, key);
}
}
bool send_metakey(connection_t *c) {
@ -164,7 +248,7 @@ bool send_metakey(connection_t *c) {
if(!cipher_open_blowfish_ofb(&c->outcipher))
return false;
if(!digest_open_sha1(&c->outdigest, -1))
return false;
@ -191,9 +275,9 @@ bool send_metakey(connection_t *c) {
cipher_set_key_from_rsa(&c->outcipher, key, len, true);
ifdebug(SCARY_THINGS) {
if(debug_level >= DEBUG_SCARY_THINGS) {
bin2hex(key, hexkey, len);
logger(LOG_DEBUG, "Generated random meta key (unencrypted): %s", hexkey);
logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Generated random meta key (unencrypted): %s", hexkey);
}
/* Encrypt the random data
@ -204,7 +288,7 @@ bool send_metakey(connection_t *c) {
*/
if(!rsa_public_encrypt(&c->rsa, key, len, enckey)) {
logger(LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
logger(DEBUG_ALWAYS, LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
return false;
}
@ -218,90 +302,12 @@ bool send_metakey(connection_t *c) {
cipher_get_nid(&c->outcipher),
digest_get_nid(&c->outdigest), c->outmaclength,
c->outcompression, hexkey);
c->status.encryptout = true;
return result;
}
static bool metakey_ec_h(connection_t *c, const char *request) {
size_t siglen = ecdsa_size(&c->ecdsa);
char key[MAX_STRING_SIZE];
char sig[siglen];
logger(LOG_DEBUG, "Got ECDH metakey from %s", c->name);
if(sscanf(request, "%*d " MAX_STRING, key) != 1) {
logger(LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
return false;
}
int inlen = b64decode(key, key, sizeof key);
if(inlen != (ECDH_SIZE + siglen)) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
return false;
}
if(!ecdsa_verify(&c->ecdsa, key, ECDH_SIZE, key + ECDH_SIZE)) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "invalid ECDSA signature");
return false;
}
char shared[ECDH_SHARED_SIZE];
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);
cipher_set_key(&c->incipher, mykey, false);
digest_set_key(&c->indigest, mykey + mykeylen, mykeylen);
cipher_set_key(&c->outcipher, hiskey, true);
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);
bool metakey_h(connection_t *c, const char *request) {
char hexkey[MAX_STRING_SIZE];
int cipher, digest, maclength, compression;
size_t len = rsa_size(&myself->connection->rsa);
@ -309,7 +315,7 @@ bool metakey_h(connection_t *c, char *request) {
char key[len];
if(sscanf(request, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, hexkey) != 5) {
logger(LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
return false;
}
@ -320,31 +326,31 @@ bool metakey_h(connection_t *c, char *request) {
/* Check if the length of the meta key is all right */
if(inlen != len) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
return false;
}
/* Decrypt the meta key */
if(!rsa_private_decrypt(&myself->connection->rsa, enckey, len, key)) {
logger(LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
logger(DEBUG_ALWAYS, LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
return false;
}
ifdebug(SCARY_THINGS) {
if(debug_level >= DEBUG_SCARY_THINGS) {
bin2hex(key, hexkey, len);
logger(LOG_DEBUG, "Received random meta key (unencrypted): %s", hexkey);
logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Received random meta key (unencrypted): %s", hexkey);
}
/* 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(LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
return false;
}
if(!digest_open_by_nid(&c->indigest, digest, -1)) {
logger(LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
return false;
}
@ -356,7 +362,7 @@ bool metakey_h(connection_t *c, char *request) {
}
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)
@ -375,14 +381,14 @@ bool send_challenge(connection_t *c) {
return send_request(c, "%d %s", CHALLENGE, buffer);
}
bool challenge_h(connection_t *c, char *request) {
bool challenge_h(connection_t *c, const 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];
if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
logger(LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name, c->hostname);
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name, c->hostname);
return false;
}
@ -393,7 +399,7 @@ bool challenge_h(connection_t *c, char *request) {
/* Check if the length of the challenge is all right */
if(inlen != len) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge length");
logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge length");
return false;
}
@ -412,11 +418,11 @@ bool challenge_h(connection_t *c, char *request) {
return send_request(c, "%d %s", CHAL_REPLY, buffer);
}
bool chal_reply_h(connection_t *c, char *request) {
bool chal_reply_h(connection_t *c, const char *request) {
char hishash[MAX_STRING_SIZE];
if(sscanf(request, "%*d " MAX_STRING, hishash) != 1) {
logger(LOG_ERR, "Got bad %s from %s (%s)", "CHAL_REPLY", c->name,
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHAL_REPLY", c->name,
c->hostname);
return false;
}
@ -428,15 +434,15 @@ bool chal_reply_h(connection_t *c, char *request) {
/* Check if the length of the hash is all right */
if(inlen != digest_length(&c->outdigest)) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
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, c->protocol_minor >= 2 ? ECDH_SIZE : rsa_size(&c->rsa), hishash)) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
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;
}
@ -498,61 +504,48 @@ bool send_ack(connection_t *c) {
get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight);
return send_request(c, "%d %s %d %x", ACK, myport, c->estimated_weight, c->options);
return send_request(c, "%d %s %d %x", ACK, myport, c->estimated_weight, (c->options & 0xffffff) | (experimental ? (PROT_MINOR << 24) : 0));
}
static void send_everything(connection_t *c) {
splay_node_t *node, *node2;
node_t *n;
subnet_t *s;
edge_t *e;
/* Send all known subnets and edges */
if(tunnelserver) {
for(node = myself->subnet_tree->head; node; node = node->next) {
s = node->data;
for splay_each(subnet_t, s, myself->subnet_tree)
send_add_subnet(c, s);
}
return;
}
for(node = node_tree->head; node; node = node->next) {
n = node->data;
for(node2 = n->subnet_tree->head; node2; node2 = node2->next) {
s = node2->data;
for splay_each(node_t, n, node_tree) {
for splay_each(subnet_t, s, n->subnet_tree)
send_add_subnet(c, s);
}
for(node2 = n->edge_tree->head; node2; node2 = node2->next) {
e = node2->data;
for splay_each(edge_t, e, n->edge_tree)
send_add_edge(c, e);
}
}
}
static bool upgrade_h(connection_t *c, char *request) {
static bool upgrade_h(connection_t *c, const 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);
logger(DEBUG_ALWAYS, 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);
logger(DEBUG_ALWAYS, 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);
logger(DEBUG_ALWAYS, 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) {
bool ack_h(connection_t *c, const char *request) {
if(c->protocol_minor == 1)
return upgrade_h(c, request);
@ -564,7 +557,7 @@ bool ack_h(connection_t *c, char *request) {
bool choice;
if(sscanf(request, "%*d " MAX_STRING " %d %x", hisport, &weight, &options) != 3) {
logger(LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name,
logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name,
c->hostname);
return false;
}
@ -580,11 +573,11 @@ bool ack_h(connection_t *c, char *request) {
} else {
if(n->connection) {
/* Oh dear, we already have a connection to this node. */
ifdebug(CONNECTIONS) logger(LOG_DEBUG, "Established a second connection with %s (%s), closing old connection", n->connection->name, n->connection->hostname);
logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Established a second connection with %s (%s), closing old connection", n->connection->name, n->connection->hostname);
if(n->connection->outgoing) {
if(c->outgoing)
logger(LOG_WARNING, "Two outgoing connections to the same node!");
logger(DEBUG_ALWAYS, LOG_WARNING, "Two outgoing connections to the same node!");
else
c->outgoing = n->connection->outgoing;
@ -618,15 +611,12 @@ bool ack_h(connection_t *c, char *request) {
c->options &= ~OPTION_CLAMP_MSS;
}
if(c->protocol_minor > 0)
c->node->status.ecdh = true;
/* Activate this connection */
c->allow_request = ALL;
c->status.active = true;
ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection with %s (%s) activated", c->name,
logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection with %s (%s) activated", c->name,
c->hostname);
/* Send him everything we know */
@ -652,7 +642,7 @@ bool ack_h(connection_t *c, char *request) {
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 */