/*
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
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_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;
}
- 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);
+
+ 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));
}
- 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;
+
+ 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;
- 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");
+
+ 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;
+
+ 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))
+ 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, "%d %s %d.%d %s", ID, mesh->self->connection->name, mesh->self->connection->protocol_major, minor, mesh->appname);
}
static bool finalize_invitation(meshlink_handle_t *mesh, connection_t *c, const void *data, uint16_t len) {
+ (void)len;
+
if(strchr(data, '\n')) {
- logger(mesh, MESHLINK_ERROR, "Received invalid key from invited node %s (%s)!\n", c->name, c->hostname);
+ logger(mesh, MESHLINK_ERROR, "Received invalid key from invited node %s!\n", c->name);
return false;
}
// Create a new host config file
char filename[PATH_MAX];
- snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, c->name);
+ 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);
+ logger(mesh, MESHLINK_ERROR, "Host config file for %s already exists!\n", c->name);
return false;
}
FILE *f = fopen(filename, "w");
+
if(!f) {
logger(mesh, MESHLINK_ERROR, "Error trying to create %s: %s\n", filename, strerror(errno));
return false;
fprintf(f, "ECDSAPublicKey = %s\n", (const char *)data);
fclose(f);
- logger(mesh, MESHLINK_INFO, "Key succesfully received from %s (%s)", c->name, c->hostname);
+ logger(mesh, MESHLINK_INFO, "Key succesfully received from %s", c->name);
//TODO: callback to application to inform of an accepted invitation
connection_t *c = handle;
meshlink_handle_t *mesh = c->mesh;
- if(type == 128)
+ if(type == 128) {
return true;
+ }
- if(type == 1 && c->status.invitation_used)
+ if(type == 1 && c->status.invitation_used) {
return finalize_invitation(mesh, c, data, len);
+ }
- if(type != 0 || len != 18 || c->status.invitation_used)
+ 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(mesh->invitation_key);
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);
+ 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);
// 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
+ if(errno == ENOENT) {
+ logger(mesh, MESHLINK_ERROR, "Peer %s tried to use non-existing invitation %s\n", c->name, 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);
+ unlink(usedname);
+ return false;
+ }
+
+ // Check the timestamp
+ struct stat st;
+
+ if(fstat(fileno(f), &st)) {
+ logger(mesh, MESHLINK_ERROR, "Could not stat invitation file %s\n", usedname);
+ fclose(f);
+ unlink(usedname);
+ return false;
+ }
+
+ if(time(NULL) > st.st_mtime + mesh->invitation_timeout) {
+ logger(mesh, MESHLINK_ERROR, "Peer %s tried to use an outdated invitation file %s\n", c->name, usedname);
+ fclose(f);
+ unlink(usedname);
return false;
}
// Read the new node's Name from the file
char buf[1024];
- fgets(buf, sizeof buf, f);
- if(*buf)
+ 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)) {
// Send the node the contents of the invitation file
rewind(f);
size_t result;
- while((result = fread(buf, 1, sizeof buf, f)))
+
+ 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(mesh, MESHLINK_INFO, "Invitation %s succesfully sent to %s (%s)", cookie, c->name, c->hostname);
+ logger(mesh, MESHLINK_INFO, "Invitation %s succesfully sent to %s", cookie, c->name);
return true;
}
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, "%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);
+ logger(mesh, MESHLINK_ERROR, "Peer %s uses incompatible version %d.%d",
+ c->name, c->protocol_major, c->protocol_minor);
return false;
}
init_configuration(&c->config_tree);
if(!read_host_config(mesh, c->config_tree, c->name)) {
- logger(mesh, MESHLINK_ERROR, "Peer %s had unknown identity (%s)", c->hostname, c->name);
+ logger(mesh, MESHLINK_ERROR, "Peer %s has unknown identity", c->name);
return false;
}
}
+ bool blacklisted = false;
+ get_config_bool(lookup_config(c->config_tree, "blacklisted"), &blacklisted);
+
+ if(blacklisted) {
+ logger(mesh, MESHLINK_EPEER, "Peer %s is blacklisted", c->name);
+ return false;
+ }
+
read_ecdsa_public_key(mesh, c);
if(!ecdsa_active(c->ecdsa)) {
- logger(mesh, MESHLINK_ERROR, "No key known for peer %s (%s)", c->name, c->hostname);
+ logger(mesh, MESHLINK_ERROR, "No key known for peer %s", c->name);
node_t *n = lookup_node(mesh, c->name);
+
if(n && !n->status.waitingforkey) {
- logger(mesh, MESHLINK_INFO, "Requesting key from peer %s (%s)", c->name, c->hostname);
+ logger(mesh, MESHLINK_INFO, "Requesting key from peer %s", c->name);
send_req_key(mesh, n);
}
/* 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);
+ return sptps_start(&c->sptps, c, c->outgoing, false, mesh->self->connection->ecdsa, c->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)
+ 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));
}
/* 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);
+ }
}
}
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");
+ 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;
}
n->devclass = devclass;
node_write_devclass(mesh, n);
+ n->last_successfull_connection = time(NULL);
+
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->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 */
/* 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