2 protocol_auth.c -- handle the meta-protocol, authentication
3 Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include "connection.h"
29 #include "meshlink_internal.h"
40 #include "ed25519/sha512.h"
44 extern bool node_write_devclass(meshlink_handle_t *mesh, node_t *n);
46 static bool send_proxyrequest(meshlink_handle_t *mesh, connection_t *c) {
47 switch(mesh->proxytype) {
52 sockaddr2str(&c->address, &host, &port);
53 send_request(mesh, c, NULL, "CONNECT %s:%s HTTP/1.1\r\n\r", host, port);
60 if(c->address.sa.sa_family != AF_INET) {
61 logger(mesh, MESHLINK_ERROR, "Cannot connect to an IPv6 host through a SOCKS 4 proxy!");
65 char s4req[9 + (mesh->proxyuser ? strlen(mesh->proxyuser) : 0)];
68 memcpy(s4req + 2, &c->address.in.sin_port, 2);
69 memcpy(s4req + 4, &c->address.in.sin_addr, 4);
72 memcpy(s4req + 8, mesh->proxyuser, strlen(mesh->proxyuser));
75 s4req[sizeof(s4req) - 1] = 0;
77 return send_meta(mesh, c, s4req, sizeof(s4req));
81 int len = 3 + 6 + (c->address.sa.sa_family == AF_INET ? 4 : 16);
85 len += 3 + strlen(mesh->proxyuser) + strlen(mesh->proxypass);
96 s5req[i++] = strlen(mesh->proxyuser);
97 memcpy(s5req + i, mesh->proxyuser, strlen(mesh->proxyuser));
98 i += strlen(mesh->proxyuser);
99 s5req[i++] = strlen(mesh->proxypass);
100 memcpy(s5req + i, mesh->proxypass, strlen(mesh->proxypass));
101 i += strlen(mesh->proxypass);
111 if(c->address.sa.sa_family == AF_INET) {
113 memcpy(s5req + i, &c->address.in.sin_addr, 4);
115 memcpy(s5req + i, &c->address.in.sin_port, 2);
118 } else if(c->address.sa.sa_family == AF_INET6) {
120 memcpy(s5req + i, &c->address.in6.sin6_addr, 16);
122 memcpy(s5req + i, &c->address.in6.sin6_port, 2);
126 logger(mesh, MESHLINK_ERROR, "Address family %hx not supported for SOCKS 5 proxies!", c->address.sa.sa_family);
134 return send_meta(mesh, c, s5req, sizeof(s5req));
138 logger(mesh, MESHLINK_ERROR, "Proxy type not implemented yet");
142 logger(mesh, MESHLINK_ERROR, "Unknown proxy type");
147 bool send_id(meshlink_handle_t *mesh, connection_t *c) {
148 if(mesh->proxytype && c->outgoing)
149 if(!send_proxyrequest(mesh, c)) {
153 return send_request(mesh, c, NULL, "%d %s %d.%d %s", ID, mesh->self->name, PROT_MAJOR, PROT_MINOR, mesh->appname);
156 static bool commit_invitation(meshlink_handle_t *mesh, connection_t *c, const void *data) {
158 node_t *n = new_node();
159 n->name = xstrdup(c->name);
160 n->devclass = DEV_CLASS_UNKNOWN;
161 n->ecdsa = ecdsa_set_public_key(data);
162 n->submesh = c->submesh;
164 // Remember its current address
165 node_add_recent_address(mesh, n, &c->address);
167 if(!node_write_config(mesh, n) || !config_sync(mesh, "current")) {
168 logger(mesh, MESHLINK_ERROR, "Error writing configuration file for invited node %s!\n", c->name);
176 logger(mesh, MESHLINK_INFO, "Key successfully received from %s", c->name);
178 //TODO: callback to application to inform of an accepted invitation
180 sptps_send_record(&c->sptps, 1, "", 0);
185 static bool process_invitation(meshlink_handle_t *mesh, connection_t *c, const void *data) {
186 // Recover the filename from the cookie and the key
187 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
189 char hashbuf[18 + strlen(fingerprint)];
191 memcpy(hashbuf, data, 18);
192 memcpy(hashbuf + 18, fingerprint, sizeof(hashbuf) - 18);
193 sha512(hashbuf, sizeof(hashbuf), hash);
194 b64encode_urlsafe(hash, cookie, 18);
199 if(!invitation_read(mesh, "current", cookie, &config, mesh->config_key)) {
200 logger(mesh, MESHLINK_ERROR, "Error while trying to read invitation file\n");
204 // Read the new node's Name from the file
205 packmsg_input_t in = {config.buf, config.len};
206 packmsg_get_uint32(&in); // skip version
208 c->name = packmsg_get_str_dup(&in);
210 // Check if the file contains Sub-Mesh information
211 char *submesh_name = packmsg_get_str_dup(&in);
213 if(!strcmp(submesh_name, CORE_MESH)) {
217 if(!check_id(submesh_name)) {
218 logger(mesh, MESHLINK_ERROR, "Invalid invitation file %s\n", cookie);
223 c->submesh = lookup_or_create_submesh(mesh, submesh_name);
227 logger(mesh, MESHLINK_ERROR, "Unknown submesh in invitation file %s\n", cookie);
232 if(mesh->inviter_commits_first && !commit_invitation(mesh, c, (const char *)data + 18)) {
236 if(mesh->inviter_commits_first) {
237 devtool_set_inviter_commits_first(true);
240 // Send the node the contents of the invitation file
241 sptps_send_record(&c->sptps, 0, config.buf, config.len);
243 config_free(&config);
245 c->status.invitation_used = true;
247 logger(mesh, MESHLINK_INFO, "Invitation %s successfully sent to %s", cookie, c->name);
251 static bool receive_invitation_sptps(void *handle, uint8_t type, const void *data, uint16_t len) {
252 connection_t *c = handle;
253 meshlink_handle_t *mesh = c->mesh;
255 if(type == SPTPS_HANDSHAKE) {
256 // The peer should send its cookie first.
260 if(mesh->inviter_commits_first) {
261 if(type == 2 && len == 18 + 32 && !c->status.invitation_used) {
262 return process_invitation(mesh, c, data);
265 if(type == 0 && len == 18 && !c->status.invitation_used) {
266 return process_invitation(mesh, c, data);
267 } else if(type == 1 && len == 32 && c->status.invitation_used) {
268 return commit_invitation(mesh, c, data);
275 bool id_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
279 char name[MAX_STRING_SIZE];
281 if(sscanf(request, "%*d " MAX_STRING " %d.%d", name, &c->protocol_major, &c->protocol_minor) < 2) {
282 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "ID", c->name);
286 /* Check if this is an invitation */
289 if(!mesh->invitation_key) {
290 logger(mesh, MESHLINK_ERROR, "Got invitation from %s but we don't have an invitation key", c->name);
294 c->ecdsa = ecdsa_set_base64_public_key(name + 1);
297 logger(mesh, MESHLINK_ERROR, "Got bad invitation from %s", c->name);
301 c->status.invitation = true;
302 char *mykey = ecdsa_get_base64_public_key(mesh->invitation_key);
308 if(!send_request(mesh, c, NULL, "%d %s", ACK, mykey)) {
314 c->protocol_minor = 2;
315 c->allow_request = 1;
317 return sptps_start(&c->sptps, c, false, false, mesh->invitation_key, c->ecdsa, meshlink_invitation_label, sizeof(meshlink_invitation_label), send_meta_sptps, receive_invitation_sptps);
320 /* Check if identity is a valid name */
322 if(!check_id(name)) {
323 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ID", c->name, "invalid name");
327 /* If this is an outgoing connection, make sure we are connected to the right host */
330 if(strcmp(c->name, name)) {
331 logger(mesh, MESHLINK_ERROR, "Peer is %s instead of %s", name, c->name);
339 c->name = xstrdup(name);
342 /* Check if version matches */
344 if(c->protocol_major != PROT_MAJOR) {
345 logger(mesh, MESHLINK_ERROR, "Peer %s uses incompatible version %d.%d",
346 c->name, c->protocol_major, c->protocol_minor);
350 /* Check if we know this node */
352 node_t *n = lookup_node(mesh, c->name);
355 logger(mesh, MESHLINK_ERROR, "Peer %s has unknown identity", c->name);
359 if(n->status.blacklisted) {
360 logger(mesh, MESHLINK_WARNING, "Peer %s is blacklisted", c->name);
364 if(!node_read_public_key(mesh, n)) {
365 logger(mesh, MESHLINK_ERROR, "No key known for peer %s", c->name);
367 if(n->status.reachable && !n->status.waitingforkey) {
368 logger(mesh, MESHLINK_INFO, "Requesting key from peer %s", c->name);
369 send_req_key(mesh, n);
375 /* Forbid version rollback for nodes whose ECDSA key we know */
377 if(ecdsa_active(c->ecdsa) && c->protocol_minor < 2) {
378 logger(mesh, MESHLINK_ERROR, "Peer %s tries to roll back protocol version to %d.%d",
379 c->name, c->protocol_major, c->protocol_minor);
383 c->allow_request = ACK;
384 char label[sizeof(meshlink_tcp_label) + strlen(mesh->self->name) + strlen(c->name) + 2];
387 snprintf(label, sizeof(label), "%s %s %s", meshlink_tcp_label, mesh->self->name, c->name);
389 snprintf(label, sizeof(label), "%s %s %s", meshlink_tcp_label, c->name, mesh->self->name);
392 char buf1[1024], buf2[1024];
393 bin2hex((uint8_t *)mesh->private_key + 64, buf1, 32);
394 bin2hex((uint8_t *)n->ecdsa + 64, buf2, 32);
395 logger(mesh, MESHLINK_DEBUG, "Connection to %s mykey %s hiskey %s", c->name, buf1, buf2);
396 return sptps_start(&c->sptps, c, c->outgoing, false, mesh->private_key, n->ecdsa, label, sizeof(label) - 1, send_meta_sptps, receive_meta_sptps);
399 bool send_ack(meshlink_handle_t *mesh, connection_t *c) {
400 return send_request(mesh, c, NULL, "%d %s %d %x", ACK, mesh->myport, mesh->devclass, OPTION_PMTU_DISCOVERY | (PROT_MINOR << 24));
403 static void send_everything(meshlink_handle_t *mesh, connection_t *c) {
404 /* Send all known subnets and edges */
406 for splay_each(node_t, n, mesh->nodes) {
407 for splay_each(edge_t, e, n->edge_tree) {
408 send_add_edge(mesh, c, e, 0);
413 bool ack_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
417 char hisport[MAX_STRING_SIZE];
422 if(sscanf(request, "%*d " MAX_STRING " %d %x", hisport, &devclass, &options) != 3) {
423 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "ACK", c->name);
427 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
428 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ACK", c->name, "devclass invalid");
432 /* Check if we already have a node_t for him */
434 n = lookup_node(mesh, c->name);
438 n->name = xstrdup(c->name);
442 /* Oh dear, we already have a connection to this node. */
443 logger(mesh, MESHLINK_DEBUG, "Established a second connection with %s, closing old connection", n->connection->name);
445 if(n->connection->outgoing) {
447 logger(mesh, MESHLINK_WARNING, "Two outgoing connections to the same node!");
449 c->outgoing = n->connection->outgoing;
452 n->connection->outgoing = NULL;
455 /* Remove the edge before terminating the connection, to prevent a graph update. */
456 edge_del(mesh, n->connection->edge);
457 n->connection->edge = NULL;
459 terminate_connection(mesh, n->connection, false);
463 n->devclass = devclass;
464 n->status.dirty = true;
466 n->last_successfull_connection = mesh->loop.now.tv_sec;
471 /* Activate this connection */
473 c->allow_request = ALL;
474 c->status.active = true;
476 logger(mesh, MESHLINK_INFO, "Connection with %s activated", c->name);
478 /* Send him everything we know */
480 send_everything(mesh, c);
482 /* Create an edge_t for this connection */
484 assert(devclass >= 0 && devclass < DEV_CLASS_COUNT);
486 c->edge = new_edge();
487 c->edge->from = mesh->self;
489 sockaddrcpy_setport(&c->edge->address, &c->address, atoi(hisport));
490 c->edge->weight = mesh->dev_class_traits[devclass].edge_weight;
491 c->edge->connection = c;
493 edge_add(mesh, c->edge);
495 /* Notify everyone of the new edge */
497 send_add_edge(mesh, mesh->everyone, c->edge, 0);
499 /* Run MST and SSSP algorithms */