/*
protocol_auth.c -- handle the meta-protocol, authentication
Copyright (C) 1999-2005 Ivo Timmermans,
- 2000-2013 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
#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: {
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)
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];
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)) {
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;
}
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;
}
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(!(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];
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];
/* Check and lookup cipher and digest algorithms */
- 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;
+ 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(!(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;
+ 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;
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)
/* 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);
+ const size_t len = rsa_size(myself->connection->rsa);
size_t digestlen = digest_length(c->indigest);
char digest[digestlen];
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) {
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);
bool result = send_request(c, "%d %s", ACK, pubkey);
free(pubkey);
return result;
+#endif
}
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));
}
}
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);
+ 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);
}
/* 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);
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;
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