/*
protocol_auth.c -- handle the meta-protocol, authentication
- Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
+ Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
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 "conf.h"
#include "connection.h"
+#include "devtools.h"
#include "ecdsa.h"
#include "edge.h"
#include "graph.h"
#include "net.h"
#include "netutl.h"
#include "node.h"
+#include "packmsg.h"
#include "prf.h"
#include "protocol.h"
#include "sptps.h"
extern bool node_write_devclass(meshlink_handle_t *mesh, node_t *n);
-static bool send_proxyrequest(meshlink_handle_t *mesh, connection_t *c) {
- switch(mesh->proxytype) {
- case PROXY_HTTP: {
- char *host;
- char *port;
-
- sockaddr2str(&c->address, &host, &port);
- send_request(mesh, 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(mesh, MESHLINK_ERROR, "Cannot connect to an IPv6 host through a SOCKS 4 proxy!");
- return false;
- }
- char s4req[9 + (mesh->proxyuser ? strlen(mesh->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(mesh->proxyuser)
- memcpy(s4req + 8, mesh->proxyuser, strlen(mesh->proxyuser));
- s4req[sizeof s4req - 1] = 0;
- c->tcplen = 8;
- return send_meta(mesh, c, s4req, sizeof s4req);
- }
- case PROXY_SOCKS5: {
- int len = 3 + 6 + (c->address.sa.sa_family == AF_INET ? 4 : 16);
- c->tcplen = 2;
- if(mesh->proxypass)
- len += 3 + strlen(mesh->proxyuser) + strlen(mesh->proxypass);
- char s5req[len];
- int i = 0;
- s5req[i++] = 5;
- s5req[i++] = 1;
- if(mesh->proxypass) {
- s5req[i++] = 2;
- s5req[i++] = 1;
- s5req[i++] = strlen(mesh->proxyuser);
- memcpy(s5req + i, mesh->proxyuser, strlen(mesh->proxyuser));
- i += strlen(mesh->proxyuser);
- s5req[i++] = strlen(mesh->proxypass);
- memcpy(s5req + i, mesh->proxypass, strlen(mesh->proxypass));
- i += strlen(mesh->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(mesh, MESHLINK_ERROR, "Address family %hx not supported for SOCKS 5 proxies!", c->address.sa.sa_family);
- return false;
- }
- if(i > len)
- abort();
- return send_meta(mesh, c, s5req, sizeof s5req);
- }
- case PROXY_SOCKS4A:
- logger(mesh, MESHLINK_ERROR, "Proxy type not implemented yet");
- return false;
- case PROXY_EXEC:
- return true;
- default:
- logger(mesh, MESHLINK_ERROR, "Unknown proxy type");
- return false;
- }
-}
-
bool send_id(meshlink_handle_t *mesh, connection_t *c) {
-
- int minor = mesh->self->connection->protocol_minor;
-
- if(mesh->proxytype && c->outgoing)
- if(!send_proxyrequest(mesh, c))
- return false;
-
- return send_request(mesh, c, "%d %s %d.%d", ID, mesh->self->connection->name, mesh->self->connection->protocol_major, minor);
+ return send_request(mesh, c, NULL, "%d %s %d.%d %s", ID, mesh->self->name, PROT_MAJOR, PROT_MINOR, mesh->appname);
}
-static bool finalize_invitation(meshlink_handle_t *mesh, connection_t *c, const void *data, uint16_t len) {
- if(strchr(data, '\n')) {
- logger(mesh, MESHLINK_ERROR, "Received invalid key from invited node %s (%s)!\n", c->name, c->hostname);
- return false;
- }
+static bool commit_invitation(meshlink_handle_t *mesh, connection_t *c, const void *data) {
+ // Create a new node
+ node_t *n = new_node();
+ n->name = xstrdup(c->name);
+ n->devclass = DEV_CLASS_UNKNOWN;
+ n->ecdsa = ecdsa_set_public_key(data);
+ n->submesh = c->submesh;
- // Create a new host config file
- char filename[PATH_MAX];
- snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, c->name);
- if(!access(filename, F_OK)) {
- logger(mesh, MESHLINK_ERROR, "Host config file for %s (%s) already exists!\n", c->name, c->hostname);
- return false;
- }
+ // Remember its current address
+ node_add_recent_address(mesh, n, &c->address);
- FILE *f = fopen(filename, "w");
- if(!f) {
- logger(mesh, MESHLINK_ERROR, "Error trying to create %s: %s\n", filename, strerror(errno));
+ if(!node_write_config(mesh, n) || !config_sync(mesh, "current")) {
+ logger(mesh, MESHLINK_ERROR, "Error writing configuration file for invited node %s!\n", c->name);
+ free_node(n);
return false;
+
}
- fprintf(f, "ECDSAPublicKey = %s\n", (const char *)data);
- fclose(f);
+ node_add(mesh, n);
- logger(mesh, MESHLINK_INFO, "Key succesfully received from %s (%s)", c->name, c->hostname);
+ logger(mesh, MESHLINK_INFO, "Key successfully received from %s", c->name);
//TODO: callback to application to inform of an accepted invitation
- sptps_send_record(&c->sptps, 2, data, 0);
-
- load_all_nodes(mesh);
+ sptps_send_record(&c->sptps, 1, "", 0);
return true;
}
-static bool receive_invitation_sptps(void *handle, uint8_t type, const void *data, uint16_t len) {
- connection_t *c = handle;
- meshlink_handle_t *mesh = c->mesh;
-
- if(type == 128)
- return true;
-
- if(type == 1 && c->status.invitation_used)
- return finalize_invitation(mesh, c, data, len);
-
- if(type != 0 || len != 18 || c->status.invitation_used)
- return false;
-
+static bool process_invitation(meshlink_handle_t *mesh, connection_t *c, const void *data) {
// Recover the filename from the cookie and the key
char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
char hash[64];
char hashbuf[18 + strlen(fingerprint)];
char cookie[25];
memcpy(hashbuf, data, 18);
- memcpy(hashbuf + 18, fingerprint, sizeof hashbuf - 18);
- sha512(hashbuf, sizeof hashbuf, hash);
+ memcpy(hashbuf + 18, fingerprint, sizeof(hashbuf) - 18);
+ sha512(hashbuf, sizeof(hashbuf), hash);
b64encode_urlsafe(hash, cookie, 18);
free(fingerprint);
- char filename[PATH_MAX], usedname[PATH_MAX];
- snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookie);
- snprintf(usedname, sizeof usedname, "%s" SLASH "invitations" SLASH "%s.used", mesh->confbase, cookie);
+ config_t config;
- // Atomically rename the invitation file
- if(rename(filename, usedname)) {
- if(errno == ENOENT)
- logger(mesh, MESHLINK_ERROR, "Peer %s tried to use non-existing invitation %s\n", c->hostname, cookie);
- else
- logger(mesh, MESHLINK_ERROR, "Error trying to rename invitation %s\n", cookie);
- return false;
- }
-
- // Open the renamed file
- FILE *f = fopen(usedname, "r");
- if(!f) {
- logger(mesh, MESHLINK_ERROR, "Error trying to open invitation %s\n", cookie);
+ if(!invitation_read(mesh, "current", cookie, &config, mesh->config_key)) {
+ logger(mesh, MESHLINK_ERROR, "Error while trying to read invitation file\n");
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");
+ packmsg_input_t in = {config.buf, config.len};
+ packmsg_get_uint32(&in); // skip version
+ free(c->name);
+ c->name = packmsg_get_str_dup(&in);
+
+ // Check if the file contains Sub-Mesh information
+ char *submesh_name = packmsg_get_str_dup(&in);
+
+ if(!strcmp(submesh_name, CORE_MESH)) {
+ free(submesh_name);
+ c->submesh = NULL;
+ } else {
+ if(!check_id(submesh_name)) {
+ logger(mesh, MESHLINK_ERROR, "Invalid invitation file %s\n", cookie);
+ free(submesh_name);
+ return false;
+ }
+
+ c->submesh = lookup_or_create_submesh(mesh, submesh_name);
+ free(submesh_name);
+
+ if(!c->submesh) {
+ logger(mesh, MESHLINK_ERROR, "Unknown submesh in invitation file %s\n", cookie);
+ return false;
+ }
}
- buf[len] = 0;
- if(!*buf || !*name || strcasecmp(buf, "Name") || !check_id(name)) {
- logger(mesh, MESHLINK_ERROR, "Invalid invitation file %s\n", cookie);
- fclose(f);
+ if(mesh->inviter_commits_first && !commit_invitation(mesh, c, (const char *)data + 18)) {
return false;
}
- free(c->name);
- c->name = xstrdup(name);
+ if(mesh->inviter_commits_first) {
+ devtool_set_inviter_commits_first(true);
+ }
// 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);
+ sptps_send_record(&c->sptps, 0, config.buf, config.len);
+
+ config_free(&config);
c->status.invitation_used = true;
- logger(mesh, MESHLINK_INFO, "Invitation %s succesfully sent to %s (%s)", cookie, c->name, c->hostname);
+ logger(mesh, MESHLINK_INFO, "Invitation %s successfully sent to %s", cookie, c->name);
return true;
}
+static bool receive_invitation_sptps(void *handle, uint8_t type, const void *data, uint16_t len) {
+ connection_t *c = handle;
+ meshlink_handle_t *mesh = c->mesh;
+
+ if(type == SPTPS_HANDSHAKE) {
+ // The peer should send its cookie first.
+ return true;
+ }
+
+ if(mesh->inviter_commits_first) {
+ if(type == 2 && len == 18 + 32 && !c->status.invitation_used) {
+ return process_invitation(mesh, c, data);
+ }
+ } else {
+ if(type == 0 && len == 18 && !c->status.invitation_used) {
+ return process_invitation(mesh, c, data);
+ } else if(type == 1 && len == 32 && c->status.invitation_used) {
+ return commit_invitation(mesh, c, data);
+ }
+ }
+
+ return false;
+}
+
bool id_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
+ assert(request);
+ assert(*request);
+
char name[MAX_STRING_SIZE];
if(sscanf(request, "%*d " MAX_STRING " %d.%d", name, &c->protocol_major, &c->protocol_minor) < 2) {
- logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s)", "ID", c->name,
- c->hostname);
+ logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "ID", c->name);
return false;
}
if(name[0] == '?') {
if(!mesh->invitation_key) {
- logger(mesh, MESHLINK_ERROR, "Got invitation from %s but we don't have an invitation key", c->hostname);
+ logger(mesh, MESHLINK_ERROR, "Got invitation from %s but we don't have an invitation key", c->name);
return false;
}
c->ecdsa = ecdsa_set_base64_public_key(name + 1);
+
if(!c->ecdsa) {
- logger(mesh, MESHLINK_ERROR, "Got bad invitation from %s", c->hostname);
+ logger(mesh, MESHLINK_ERROR, "Got bad invitation from %s", c->name);
return false;
}
c->status.invitation = true;
char *mykey = ecdsa_get_base64_public_key(mesh->invitation_key);
- if(!mykey)
+
+ if(!mykey) {
return false;
- if(!send_request(mesh, c, "%d %s", ACK, mykey))
+ }
+
+ if(!send_request(mesh, c, NULL, "%d %s", ACK, mykey)) {
return false;
+ }
+
free(mykey);
c->protocol_minor = 2;
c->allow_request = 1;
- return sptps_start(&c->sptps, c, false, false, mesh->invitation_key, c->ecdsa, "meshlink invitation", 15, send_meta_sptps, receive_invitation_sptps);
+ 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);
}
/* Check if identity is a valid name */
if(!check_id(name)) {
- logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s): %s", "ID", c->name,
- c->hostname, "invalid name");
+ logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ID", c->name, "invalid name");
return false;
}
if(c->outgoing) {
if(strcmp(c->name, name)) {
- logger(mesh, MESHLINK_ERROR, "Peer %s is %s instead of %s", c->hostname, name,
- c->name);
+ logger(mesh, MESHLINK_ERROR, "Peer is %s instead of %s", name, c->name);
return false;
}
} else {
- if(c->name)
+ if(c->name) {
free(c->name);
+ }
+
c->name = xstrdup(name);
}
/* Check if version matches */
- if(c->protocol_major != mesh->self->connection->protocol_major) {
- logger(mesh, MESHLINK_ERROR, "Peer %s (%s) uses incompatible version %d.%d",
- c->name, c->hostname, c->protocol_major, c->protocol_minor);
+ if(c->protocol_major != PROT_MAJOR) {
+ logger(mesh, MESHLINK_ERROR, "Peer %s uses incompatible version %d.%d",
+ c->name, c->protocol_major, c->protocol_minor);
return false;
}
- if(!c->config_tree) {
- init_configuration(&c->config_tree);
+ /* Check if we know this node */
- if(!read_host_config(mesh, c->config_tree, c->name)) {
- logger(mesh, MESHLINK_ERROR, "Peer %s had unknown identity (%s)", c->hostname, c->name);
- return false;
+ node_t *n = lookup_node(mesh, c->name);
+
+ if(!n) {
+ logger(mesh, MESHLINK_ERROR, "Peer %s has unknown identity", c->name);
+ return false;
+ }
+
+ if(n->status.blacklisted) {
+ logger(mesh, MESHLINK_WARNING, "Peer %s is blacklisted", c->name);
+ return false;
+ }
+
+ if(!node_read_public_key(mesh, n)) {
+ logger(mesh, MESHLINK_ERROR, "No key known for peer %s", c->name);
+
+ if(n->status.reachable && !n->status.waitingforkey) {
+ logger(mesh, MESHLINK_INFO, "Requesting key from peer %s", c->name);
+ send_req_key(mesh, n);
}
- read_ecdsa_public_key(mesh, c);
- } else {
- if(c->protocol_minor && !ecdsa_active(c->ecdsa))
- c->protocol_minor = 1;
+ return false;
}
/* Forbid version rollback for nodes whose ECDSA key we know */
if(ecdsa_active(c->ecdsa) && c->protocol_minor < 2) {
- logger(mesh, MESHLINK_ERROR, "Peer %s (%s) tries to roll back protocol version to %d.%d",
- c->name, c->hostname, c->protocol_major, c->protocol_minor);
+ logger(mesh, MESHLINK_ERROR, "Peer %s tries to roll back protocol version to %d.%d",
+ c->name, c->protocol_major, c->protocol_minor);
return false;
}
c->allow_request = ACK;
- char label[25 + strlen(mesh->self->name) + strlen(c->name)];
+ char label[sizeof(meshlink_tcp_label) + strlen(mesh->self->name) + strlen(c->name) + 2];
- if(c->outgoing)
- snprintf(label, sizeof label, "meshlink TCP key expansion %s %s", mesh->self->name, c->name);
- else
- snprintf(label, sizeof label, "meshlink TCP key expansion %s %s", c->name, mesh->self->name);
+ if(c->outgoing) {
+ snprintf(label, sizeof(label), "%s %s %s", meshlink_tcp_label, mesh->self->name, c->name);
+ } else {
+ snprintf(label, sizeof(label), "%s %s %s", meshlink_tcp_label, c->name, mesh->self->name);
+ }
- return sptps_start(&c->sptps, c, c->outgoing, false, mesh->self->connection->ecdsa, c->ecdsa, label, sizeof label, send_meta_sptps, receive_meta_sptps);
+ char buf1[1024], buf2[1024];
+ bin2hex((uint8_t *)mesh->private_key + 64, buf1, 32);
+ bin2hex((uint8_t *)n->ecdsa + 64, buf2, 32);
+ logger(mesh, MESHLINK_DEBUG, "Connection to %s mykey %s hiskey %s", c->name, buf1, buf2);
+ return sptps_start(&c->sptps, c, c->outgoing, false, mesh->private_key, n->ecdsa, label, sizeof(label) - 1, send_meta_sptps, receive_meta_sptps);
}
bool send_ack(meshlink_handle_t *mesh, connection_t *c) {
-
- /* Check some options */
-
- if(mesh->self->options & OPTION_PMTU_DISCOVERY)
- c->options |= OPTION_PMTU_DISCOVERY;
-
- return send_request(mesh, c, "%d %s %d %x", ACK, mesh->myport, mesh->devclass, (c->options & 0xffffff) | (PROT_MINOR << 24));
+ return send_request(mesh, c, NULL, "%d %s %d %x", ACK, mesh->myport, mesh->devclass, OPTION_PMTU_DISCOVERY | (PROT_MINOR << 24));
}
static void send_everything(meshlink_handle_t *mesh, connection_t *c) {
/* Send all known subnets and edges */
for splay_each(node_t, n, mesh->nodes) {
- for splay_each(edge_t, e, n->edge_tree)
- send_add_edge(mesh, c, e);
+ for splay_each(edge_t, e, n->edge_tree) {
+ send_add_edge(mesh, c, e, 0);
+ }
}
}
bool ack_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
+ assert(request);
+ assert(*request);
+
char hisport[MAX_STRING_SIZE];
- char *hisaddress;
int devclass;
uint32_t options;
node_t *n;
if(sscanf(request, "%*d " MAX_STRING " %d %x", hisport, &devclass, &options) != 3) {
- logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s)", "ACK", c->name,
- c->hostname);
+ logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "ACK", c->name);
return false;
}
- if(devclass < 0 || devclass > _DEV_CLASS_MAX) {
- logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s): %s", "ACK", c->name,
- c->hostname, "devclass invalid");
+ if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
+ logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ACK", c->name, "devclass invalid");
return false;
}
} else {
if(n->connection) {
/* Oh dear, we already have a connection to this node. */
- logger(mesh, MESHLINK_DEBUG, "Established a second connection with %s (%s), closing old connection", n->connection->name, n->connection->hostname);
+ logger(mesh, MESHLINK_DEBUG, "Established a second connection with %s, closing old connection", n->connection->name);
if(n->connection->outgoing) {
- if(c->outgoing)
+ if(c->outgoing) {
logger(mesh, MESHLINK_WARNING, "Two outgoing connections to the same node!");
- else
+ } else {
c->outgoing = n->connection->outgoing;
+ }
n->connection->outgoing = NULL;
}
+ /* Remove the edge before terminating the connection, to prevent a graph update. */
+ edge_del(mesh, n->connection->edge);
+ n->connection->edge = NULL;
+
terminate_connection(mesh, n->connection, false);
- /* Run graph algorithm to keep things in sync */
- graph(mesh);
}
}
n->devclass = devclass;
- node_write_devclass(mesh, n);
+ n->status.dirty = true;
+
+ n->last_successfull_connection = mesh->loop.now.tv_sec;
n->connection = c;
c->node = n;
- if(!(c->options & options & OPTION_PMTU_DISCOVERY)) {
- c->options &= ~OPTION_PMTU_DISCOVERY;
- options &= ~OPTION_PMTU_DISCOVERY;
- }
- c->options |= options;
/* Activate this connection */
c->allow_request = ALL;
+ c->last_key_renewal = mesh->loop.now.tv_sec;
c->status.active = true;
- logger(mesh, MESHLINK_INFO, "Connection with %s (%s) activated", c->name,
- c->hostname);
+ logger(mesh, MESHLINK_INFO, "Connection with %s activated", c->name);
/* Send him everything we know */
/* Create an edge_t for this connection */
- assert(devclass >= 0 && devclass <= _DEV_CLASS_MAX);
+ assert(devclass >= 0 && devclass < DEV_CLASS_COUNT);
c->edge = new_edge();
c->edge->from = mesh->self;
c->edge->to = n;
- sockaddr2str(&c->address, &hisaddress, NULL);
- c->edge->address = str2sockaddr(hisaddress, hisport);
- free(hisaddress);
- c->edge->weight = dev_class_traits[devclass].edge_weight;
+ sockaddrcpy_setport(&c->edge->address, &c->address, atoi(hisport));
+ c->edge->weight = mesh->dev_class_traits[devclass].edge_weight;
c->edge->connection = c;
- c->edge->options = c->options;
edge_add(mesh, c->edge);
/* Notify everyone of the new edge */
- send_add_edge(mesh, mesh->everyone, c->edge);
+ send_add_edge(mesh, mesh->everyone, c->edge, 0);
/* Run MST and SSSP algorithms */
projects / meshlink / blobdiff