--- /dev/null
+/*
+ invitation.c -- Create and accept invitations
+ Copyright (C) 2013 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
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "system.h"
+
+#include "control_common.h"
+#include "crypto.h"
+#include "ecdsa.h"
+#include "ecdsagen.h"
+#include "invitation.h"
+#include "names.h"
+#include "netutl.h"
+#include "rsagen.h"
+#include "sptps.h"
+#include "tincctl.h"
+#include "utils.h"
+#include "xalloc.h"
+
+#ifdef HAVE_MINGW
+#define SCRIPTEXTENSION ".bat"
+#else
+#define SCRIPTEXTENSION ""
+#endif
+
+int addressfamily = AF_UNSPEC;
+
+char *get_my_hostname() {
+ char *hostname = NULL;
+ char *name = get_my_name(false);
+ char *filename = NULL;
+
+ // Use first Address statement in own host config file
+ if(check_id(name)) {
+ xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
+ FILE *f = fopen(filename, "r");
+ if(f) {
+ while(fgets(line, sizeof line, f)) {
+ if(!rstrip(line))
+ continue;
+ char *p = line, *q;
+ p += strcspn(p, "\t =");
+ if(!*p)
+ continue;
+ q = p + strspn(p, "\t ");
+ if(*q == '=')
+ q += 1 + strspn(q + 1, "\t ");
+ *p = 0;
+ if(strcasecmp(line, "Address"))
+ continue;
+ p = q + strcspn(q, "\t ");
+ if(*p)
+ *p++ = 0;
+ p += strspn(p, "\t ");
+ p[strcspn(p, "\t ")] = 0;
+ if(*p) {
+ if(strchr(q, ':'))
+ xasprintf(&hostname, "[%s]:%s", q, p);
+ else
+ xasprintf(&hostname, "%s:%s", q, p);
+ } else {
+ hostname = xstrdup(q);
+ }
+ break;
+ }
+ fclose(f);
+ }
+ }
+
+ if(hostname) {
+ free(filename);
+ return hostname;
+ }
+
+ // If that doesn't work, guess externally visible hostname
+ fprintf(stderr, "Trying to discover externally visible hostname...\n");
+ struct addrinfo *ai = str2addrinfo("ifconfig.me", "80", SOCK_STREAM);
+ static const char request[] = "GET /host HTTP/1.0\r\n\r\n";
+ if(ai) {
+ int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+ if(s >= 0) {
+ if(connect(s, ai->ai_addr, ai->ai_addrlen)) {
+ closesocket(s);
+ s = -1;
+ }
+ }
+ if(s >= 0) {
+ send(s, request, sizeof request - 1, 0);
+ int len = recv(s, line, sizeof line - 1, MSG_WAITALL);
+ if(len > 0) {
+ line[len] = 0;
+ if(line[len - 1] == '\n')
+ line[--len] = 0;
+ char *p = strrchr(line, '\n');
+ if(p && p[1])
+ hostname = xstrdup(p + 1);
+ }
+ closesocket(s);
+ }
+ freeaddrinfo(ai);
+ }
+
+ // Check that the hostname is reasonable
+ if(hostname) {
+ for(char *p = hostname; *p; p++) {
+ if(isalnum(*p) || *p == '-' || *p == '.')
+ continue;
+ // If not, forget it.
+ free(hostname);
+ hostname = NULL;
+ break;
+ }
+ }
+
+again:
+ printf("Please enter your host's external address or hostname");
+ if(hostname)
+ printf(" [%s]", hostname);
+ printf(": ");
+ fflush(stdout);
+
+ if(!fgets(line, sizeof line, stdin)) {
+ fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
+ free(hostname);
+ return NULL;
+ }
+
+ if(!rstrip(line)) {
+ if(hostname)
+ goto done;
+ else
+ goto again;
+ }
+
+ for(char *p = line; *p; p++) {
+ if(isalnum(*p) || *p == '-' || *p == '.')
+ continue;
+ fprintf(stderr, "Invalid address or hostname.\n");
+ goto again;
+ }
+
+ free(hostname);
+ hostname = xstrdup(line);
+
+done:
+ if(filename) {
+ FILE *f = fopen(filename, "a");
+ if(f) {
+ fprintf(f, "\nAddress = %s\n", hostname);
+ fclose(f);
+ } else {
+ fprintf(stderr, "Could not append Address to %s: %s\n", filename, strerror(errno));
+ }
+ free(filename);
+ }
+
+ return hostname;
+}
+
+static bool fcopy(FILE *out, const char *filename) {
+ FILE *in = fopen(filename, "r");
+ if(!in) {
+ fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ char buf[1024];
+ size_t len;
+ while((len = fread(buf, 1, sizeof buf, in)))
+ fwrite(buf, len, 1, out);
+ fclose(in);
+ return true;
+}
+
+int cmd_invite(int argc, char *argv[]) {
+ if(argc < 2) {
+ fprintf(stderr, "Not enough arguments!\n");
+ return 1;
+ }
+
+ // Check validity of the new node's name
+ if(!check_id(argv[1])) {
+ fprintf(stderr, "Invalid name for node.\n");
+ return 1;
+ }
+
+ char *myname = get_my_name(true);
+ if(!myname)
+ return 1;
+
+ // Ensure no host configuration file with that name exists
+ char *filename = NULL;
+ xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, argv[1]);
+ if(!access(filename, F_OK)) {
+ free(filename);
+ fprintf(stderr, "A host config file for %s already exists!\n", argv[1]);
+ return 1;
+ }
+ free(filename);
+
+ // If a daemon is running, ensure no other nodes now about this name
+ bool found = false;
+ if(connect_tincd(false)) {
+ sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
+
+ while(recvline(fd, line, sizeof line)) {
+ char node[4096];
+ int code, req;
+ if(sscanf(line, "%d %d %s", &code, &req, node) != 3)
+ break;
+ if(!strcmp(node, argv[1]))
+ found = true;
+ }
+
+ if(found) {
+ fprintf(stderr, "A node with name %s is already known!\n", argv[1]);
+ return 1;
+ }
+ }
+
+ char hash[25];
+
+ xasprintf(&filename, "%s" SLASH "invitations", confbase);
+ if(mkdir(filename, 0700) && errno != EEXIST) {
+ fprintf(stderr, "Could not create directory %s: %s\n", filename, strerror(errno));
+ free(filename);
+ return 1;
+ }
+
+ // Count the number of valid invitations, clean up old ones
+ DIR *dir = opendir(filename);
+ if(!dir) {
+ fprintf(stderr, "Could not read directory %s: %s\n", filename, strerror(errno));
+ free(filename);
+ return 1;
+ }
+
+ errno = 0;
+ int count = 0;
+ struct dirent *ent;
+ time_t deadline = time(NULL) - 604800; // 1 week in the past
+
+ while((ent = readdir(dir))) {
+ if(strlen(ent->d_name) != 24)
+ continue;
+ char *invname;
+ struct stat st;
+ xasprintf(&invname, "%s" SLASH "%s", filename, ent->d_name);
+ if(!stat(invname, &st)) {
+ if(deadline < st.st_mtime)
+ count++;
+ else
+ unlink(invname);
+ } else {
+ fprintf(stderr, "Could not stat %s: %s\n", invname, strerror(errno));
+ errno = 0;
+ }
+ free(invname);
+ }
+
+ if(errno) {
+ fprintf(stderr, "Error while reading directory %s: %s\n", filename, strerror(errno));
+ closedir(dir);
+ free(filename);
+ return 1;
+ }
+
+ closedir(dir);
+ free(filename);
+
+ ecdsa_t *key;
+ xasprintf(&filename, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", confbase);
+
+ // Remove the key if there are no outstanding invitations.
+ if(!count)
+ unlink(filename);
+
+ // Create a new key if necessary.
+ FILE *f = fopen(filename, "r");
+ if(!f) {
+ if(errno != ENOENT) {
+ fprintf(stderr, "Could not read %s: %s\n", filename, strerror(errno));
+ free(filename);
+ return 1;
+ }
+
+ key = ecdsa_generate();
+ if(!key) {
+ free(filename);
+ return 1;
+ }
+ f = fopen(filename, "w");
+ if(!f) {
+ fprintf(stderr, "Could not write %s: %s\n", filename, strerror(errno));
+ free(filename);
+ return 1;
+ }
+ chmod(filename, 0600);
+ ecdsa_write_pem_private_key(key, f);
+ } else {
+ key = ecdsa_read_pem_private_key(f);
+ if(!key)
+ fprintf(stderr, "Could not read private key from %s\n", filename);
+ }
+ fclose(f);
+ free(filename);
+ if(!key)
+ return 1;
+
+ // Create a hash of the key.
+ char *fingerprint = ecdsa_get_base64_public_key(key);
+ digest_t *digest = digest_open_by_name("sha256", 18);
+ if(!digest)
+ abort();
+ digest_create(digest, fingerprint, strlen(fingerprint), hash);
+ b64encode_urlsafe(hash, hash, 18);
+
+ // Create a random cookie for this invitation.
+ char cookie[25];
+ randomize(cookie, 18);
+ b64encode_urlsafe(cookie, cookie, 18);
+
+ // Create a file containing the details of the invitation.
+ xasprintf(&filename, "%s" SLASH "invitations" SLASH "%s", confbase, cookie);
+ int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
+ if(!ifd) {
+ fprintf(stderr, "Could not create invitation file %s: %s\n", filename, strerror(errno));
+ free(filename);
+ return 1;
+ }
+ free(filename);
+ f = fdopen(ifd, "w");
+ if(!f)
+ abort();
+
+ // Fill in the details.
+ fprintf(f, "Name = %s\n", argv[1]);
+ if(netname)
+ fprintf(f, "NetName = %s\n", netname);
+ fprintf(f, "ConnectTo = %s\n", myname);
+ // TODO: copy Broadcast and Mode
+ fprintf(f, "#---------------------------------------------------------------#\n");
+ fprintf(f, "Name = %s\n", myname);
+
+ xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, myname);
+ fcopy(f, filename);
+ fclose(f);
+
+ // Create an URL from the local address, key hash and cookie
+ char *address = get_my_hostname();
+ printf("%s/%s%s\n", address, hash, cookie);
+ free(filename);
+ free(address);
+
+ return 0;
+}
+
+static int sock;
+static char cookie[18];
+static sptps_t sptps;
+static char *data;
+static size_t datalen;
+static bool success = false;
+
+static char cookie[18], hash[18];
+
+static char *get_line(const char **data) {
+ if(!data || !*data)
+ return NULL;
+
+ if(!**data) {
+ *data = NULL;
+ return NULL;
+ }
+
+ static char line[1024];
+ const char *end = strchr(*data, '\n');
+ size_t len = end ? end - *data : strlen(*data);
+ if(len >= sizeof line) {
+ fprintf(stderr, "Maximum line length exceeded!\n");
+ return NULL;
+ }
+ if(len && !isprint(**data))
+ abort();
+
+ memcpy(line, *data, len);
+ line[len] = 0;
+
+ if(end)
+ *data = end + 1;
+ else
+ *data = NULL;
+
+ return line;
+}
+
+static char *get_value(const char *data, const char *var) {
+ char *line = get_line(&data);
+ if(!line)
+ return NULL;
+
+ char *sep = line + strcspn(line, " \t=");
+ char *val = sep + strspn(sep, " \t");
+ if(*val == '=')
+ val += 1 + strspn(val + 1, " \t");
+ *sep = 0;
+ if(strcasecmp(line, var))
+ return NULL;
+ return val;
+}
+
+static char *grep(const char *data, const char *var) {
+ static char value[1024];
+
+ const char *p = data;
+ int varlen = strlen(var);
+
+ // Skip all lines not starting with var
+ while(strncasecmp(p, var, varlen) || !strchr(" \t=", p[varlen])) {
+ p = strchr(p, '\n');
+ if(!p)
+ break;
+ else
+ p++;
+ }
+
+ if(!p)
+ return NULL;
+
+ p += varlen;
+ p += strspn(p, " \t");
+ if(*p == '=')
+ p += 1 + strspn(p + 1, " \t");
+
+ const char *e = strchr(p, '\n');
+ if(!e)
+ return xstrdup(p);
+
+ if(e - p >= sizeof value) {
+ fprintf(stderr, "Maximum line length exceeded!\n");
+ return NULL;
+ }
+
+ memcpy(value, p, e - p);
+ value[e - p] = 0;
+ return value;
+}
+
+static bool finalize_join(void) {
+ char *name = xstrdup(get_value(data, "Name"));
+ if(!name) {
+ fprintf(stderr, "No Name found in invitation!\n");
+ return false;
+ }
+
+ if(!check_id(name)) {
+ fprintf(stderr, "Invalid Name found in invitation: %s!\n", name);
+ return false;
+ }
+
+ if(!netname)
+ netname = grep(data, "NetName");
+
+make_names:
+ if(!confbasegiven) {
+ free(confbase);
+ confbase = NULL;
+ }
+
+ make_names();
+
+ free(tinc_conf);
+ free(hosts_dir);
+
+ xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
+ xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
+
+ if(!access(tinc_conf, F_OK)) {
+ fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
+ if(!tty || confbasegiven)
+ return false;
+ask_netname:
+ fprintf(stderr, "Enter a new netname: ");
+ if(!fgets(line, sizeof line, stdin)) {
+ fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
+ return false;
+ }
+ if(!*line || *line == '\n')
+ goto ask_netname;
+
+ line[strlen(line) - 1] = 0;
+ netname = line;
+ goto make_names;
+ }
+
+ if(mkdir(confbase, 0755) && errno != EEXIST) {
+ fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
+ return false;
+ }
+
+ if(mkdir(hosts_dir, 0755) && errno != EEXIST) {
+ fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
+ return false;
+ }
+
+ FILE *f = fopen(tinc_conf, "w");
+ if(!f) {
+ fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
+ return false;
+ }
+
+ fprintf(f, "Name = %s\n", name);
+
+ char *filename;
+ xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
+ FILE *fh = fopen(filename, "w");
+ if(!fh) {
+ fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ // Filter first chunk on approved keywords, split between tinc.conf and hosts/Name
+ // Other chunks go unfiltered to their respective host config files
+ const char *p = data;
+ char *l, *value;
+
+ while((l = get_line(&p))) {
+ // Ignore comments
+ if(*l == '#')
+ continue;
+
+ // Split line into variable and value
+ int len = strcspn(l, "\t =");
+ value = l + len;
+ value += strspn(value, "\t ");
+ if(*value == '=') {
+ value++;
+ value += strspn(value, "\t ");
+ }
+ l[len] = 0;
+
+ // Is it a Name?
+ if(!strcasecmp(l, "Name"))
+ if(strcmp(value, name))
+ break;
+ else
+ continue;
+ else if(!strcasecmp(l, "NetName"))
+ continue;
+
+ // Check the list of known variables
+ bool found = false;
+ int i;
+ for(i = 0; variables[i].name; i++) {
+ if(strcasecmp(l, variables[i].name))
+ continue;
+ found = true;
+ break;
+ }
+
+ // Ignore unknown and unsafe variables
+ if(!found) {
+ fprintf(stderr, "Ignoring unknown variable '%s' in invitation.\n", l);
+ continue;
+ } else if(!(variables[i].type & VAR_SAFE)) {
+ fprintf(stderr, "Ignoring unsafe variable '%s' in invitation.\n", l);
+ continue;
+ }
+
+ // Copy the safe variable to the right config file
+ fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value);
+ }
+
+ fclose(f);
+ free(filename);
+
+ while(l && !strcasecmp(l, "Name")) {
+ if(!check_id(value)) {
+ fprintf(stderr, "Invalid Name found in invitation.\n");
+ return false;
+ }
+
+ if(!strcmp(value, name)) {
+ fprintf(stderr, "Secondary chunk would overwrite our own host config file.\n");
+ return false;
+ }
+
+ xasprintf(&filename, "%s" SLASH "%s", hosts_dir, value);
+ f = fopen(filename, "w");
+
+ if(!f) {
+ fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ while((l = get_line(&p))) {
+ if(!strcmp(l, "#---------------------------------------------------------------#"))
+ continue;
+ int len = strcspn(l, "\t =");
+ if(len == 4 && !strncasecmp(l, "Name", 4)) {
+ value = l + len;
+ value += strspn(value, "\t ");
+ if(*value == '=') {
+ value++;
+ value += strspn(value, "\t ");
+ }
+ l[len] = 0;
+ break;
+ }
+
+ fputs(l, f);
+ fputc('\n', f);
+ }
+
+ fclose(f);
+ free(filename);
+ }
+
+ // Generate our key and send a copy to the server
+ ecdsa_t *key = ecdsa_generate();
+ if(!key)
+ return false;
+
+ char *b64key = ecdsa_get_base64_public_key(key);
+ if(!b64key)
+ return false;
+
+ xasprintf(&filename, "%s" SLASH "ecdsa_key.priv", confbase);
+ f = fopen(filename, "w");
+
+#ifdef HAVE_FCHMOD
+ /* Make it unreadable for others. */
+ fchmod(fileno(f), 0600);
+#endif
+
+ if(!ecdsa_write_pem_private_key(key, f)) {
+ fprintf(stderr, "Error writing private key!\n");
+ ecdsa_free(key);
+ fclose(f);
+ return false;
+ }
+
+ fclose(f);
+
+ fprintf(fh, "ECDSAPublicKey = %s\n", b64key);
+
+ sptps_send_record(&sptps, 1, b64key, strlen(b64key));
+ free(b64key);
+
+
+ rsa_t *rsa = rsa_generate(2048, 0x1001);
+ xasprintf(&filename, "%s" SLASH "rsa_key.priv", confbase);
+ f = fopen(filename, "w");
+
+#ifdef HAVE_FCHMOD
+ /* Make it unreadable for others. */
+ fchmod(fileno(f), 0600);
+#endif
+
+ rsa_write_pem_private_key(rsa, f);
+ fclose(f);
+
+ rsa_write_pem_public_key(rsa, fh);
+ fclose(fh);
+
+ ecdsa_free(key);
+ rsa_free(rsa);
+
+ fprintf(stderr, "Invitation succesfully accepted.\n");
+ shutdown(sock, SHUT_RDWR);
+ success = true;
+
+ return true;
+}
+
+static bool invitation_send(void *handle, uint8_t type, const char *data, size_t len) {
+ while(len) {
+ int result = send(sock, data, len, 0);
+ if(result == -1 && errno == EINTR)
+ continue;
+ else if(result <= 0)
+ return false;
+ data += result;
+ len -= result;
+ }
+ return true;
+}
+
+static bool invitation_receive(void *handle, uint8_t type, const char *msg, uint16_t len) {
+ switch(type) {
+ case SPTPS_HANDSHAKE:
+ return sptps_send_record(&sptps, 0, cookie, sizeof cookie);
+
+ case 0:
+ data = xrealloc(data, datalen + len + 1);
+ memcpy(data + datalen, msg, len);
+ datalen += len;
+ data[datalen] = 0;
+ break;
+
+ case 1:
+ return finalize_join();
+
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+int cmd_join(int argc, char *argv[]) {
+ free(data);
+ data = NULL;
+ datalen = 0;
+
+ if(argc > 2) {
+ fprintf(stderr, "Too many arguments!\n");
+ return 1;
+ }
+
+ // Make sure confdir exists.
+ if(mkdir(confdir, 0755) && errno != EEXIST) {
+ fprintf(stderr, "Could not create directory %s: %s\n", CONFDIR, strerror(errno));
+ return 1;
+ }
+
+ // Either read the invitation from the command line or from stdin.
+ char *invitation;
+
+ if(argc > 1) {
+ invitation = argv[1];
+ } else {
+ if(tty) {
+ printf("Enter invitation URL: ");
+ fflush(stdout);
+ }
+ errno = EPIPE;
+ if(!fgets(line, sizeof line, stdin)) {
+ fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
+ return false;
+ }
+ invitation = line;
+ }
+
+ // Parse the invitation URL.
+ rstrip(line);
+
+ char *slash = strchr(invitation, '/');
+ if(!slash)
+ goto invalid;
+
+ *slash++ = 0;
+
+ if(strlen(slash) != 48)
+ goto invalid;
+
+ char *address = invitation;
+ char *port = NULL;
+ if(*address == '[') {
+ address++;
+ char *bracket = strchr(address, ']');
+ if(!bracket)
+ goto invalid;
+ *bracket = 0;
+ if(bracket[1] == ':')
+ port = bracket + 2;
+ } else {
+ port = strchr(address, ':');
+ if(port)
+ *port++ = 0;
+ }
+
+ if(!port || !*port)
+ port = "655";
+
+ if(!b64decode(slash, hash, 18) || !b64decode(slash + 24, cookie, 18))
+ goto invalid;
+
+ // Generate a throw-away key for the invitation.
+ ecdsa_t *key = ecdsa_generate();
+ if(!key)
+ return 1;
+
+ char *b64key = ecdsa_get_base64_public_key(key);
+
+ // Connect to the tinc daemon mentioned in the URL.
+ struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
+ if(!ai)
+ return 1;
+
+ sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+ if(sock <= 0) {
+ fprintf(stderr, "Could not open socket: %s\n", strerror(errno));
+ return 1;
+ }
+
+ if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
+ fprintf(stderr, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
+ closesocket(sock);
+ return 1;
+ }
+
+ fprintf(stderr, "Connected to %s port %s...\n", address, port);
+
+ // Tell him we have an invitation, and give him our throw-away key.
+ int len = snprintf(line, sizeof line, "0 ?%s %d.%d\n", b64key, PROT_MAJOR, PROT_MINOR);
+ if(len <= 0 || len >= sizeof line)
+ abort();
+
+ if(!sendline(sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) {
+ fprintf(stderr, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
+ closesocket(sock);
+ return 1;
+ }
+
+ char hisname[4096] = "";
+ int code, hismajor, hisminor = 0;
+
+ if(!recvline(sock, line, sizeof line) || sscanf(line, "%d %s %d.%d", &code, hisname, &hismajor, &hisminor) < 3 || code != 0 || hismajor != PROT_MAJOR || !check_id(hisname) || !recvline(sock, line, sizeof line) || !rstrip(line) || sscanf(line, "%d ", &code) != 1 || code != ACK || strlen(line) < 3) {
+ fprintf(stderr, "Cannot read greeting from peer\n");
+ closesocket(sock);
+ return 1;
+ }
+
+ // Check if the hash of the key he have us matches the hash in the URL.
+ char *fingerprint = line + 2;
+ digest_t *digest = digest_open_by_name("sha256", 18);
+ if(!digest)
+ abort();
+ char hishash[18];
+ if(!digest_create(digest, fingerprint, strlen(fingerprint), hishash)) {
+ fprintf(stderr, "Could not create digest\n%s\n", line + 2);
+ return 1;
+ }
+ if(memcmp(hishash, hash, 18)) {
+ fprintf(stderr, "Peer has an invalid key!\n%s\n", line + 2);
+ return 1;
+
+ }
+
+ ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
+ if(!hiskey)
+ return 1;
+
+ // Start an SPTPS session
+ if(!sptps_start(&sptps, NULL, true, false, key, hiskey, "tinc invitation", 15, invitation_send, invitation_receive))
+ return 1;
+
+ // Feed rest of input buffer to SPTPS
+ if(!sptps_receive_data(&sptps, buffer, blen))
+ return 1;
+
+ while((len = recv(sock, line, sizeof line, 0))) {
+ if(len < 0) {
+ if(errno == EINTR)
+ continue;
+ fprintf(stderr, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
+ return 1;
+ }
+
+ if(!sptps_receive_data(&sptps, line, len))
+ return 1;
+ }
+
+ sptps_stop(&sptps);
+ ecdsa_free(hiskey);
+ ecdsa_free(key);
+ closesocket(sock);
+
+ if(!success) {
+ fprintf(stderr, "Connection closed by peer, invitation cancelled.\n");
+ return 1;
+ }
+
+ return 0;
+
+invalid:
+ fprintf(stderr, "Invalid invitation URL.\n");
+ return 1;
+}
#include "cipher.h"
#include "crypto.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 "utils.h"
#include "xalloc.h"
+ecdsa_t *invitation_key = NULL;
+
static bool send_proxyrequest(connection_t *c) {
switch(proxytype) {
case PROXY_HTTP: {
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, "ECDSAPublicKey = %s\n", data);
+ fclose(f);
+
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Key succesfully received from %s (%s)", c->name, c->hostname);
+ return true;
+}
+
+static bool receive_invitation_sptps(void *handle, uint8_t type, const char *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;
+
+ char cookie[25];
+ b64encode_urlsafe(data, cookie, 18);
+
+ 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)) {
#include "xalloc.h"
#include "protocol.h"
#include "control_common.h"
+#include "crypto.h"
#include "ecdsagen.h"
#include "info.h"
+#include "invitation.h"
#include "names.h"
#include "rsagen.h"
#include "utils.h"
#ifdef HAVE_MINGW
#define mkdir(a, b) mkdir(a)
+#define SCRIPTEXTENSION ".bat"
+#else
+#define SCRIPTEXTENSION ""
#endif
static char **orig_argv;
static char *name = NULL;
static char controlcookie[1025];
-static char *tinc_conf = NULL;
-static char *hosts_dir = NULL;
+char *tinc_conf = NULL;
+char *hosts_dir = NULL;
struct timeval now;
// Horrible global variables...
static int pid = 0;
-static int fd = -1;
-static char line[4096];
+int fd = -1;
+char line[4096];
static int code;
static int req;
static int result;
static bool force = false;
-static bool tty = true;
+bool tty = true;
+bool confbasegiven = false;
+bool netnamegiven = false;
#ifdef HAVE_MINGW
static struct WSAData wsa_state;
" import [--force] Import host configuration file(s) from standard input\n"
" exchange [--force] Same as export followed by import\n"
" exchange-all [--force] Same as export-all followed by import\n"
+ " invite NODE [...] Generate an invitation for NODE\n"
+ " join INVITATION Join a VPN using an INVITIATION\n"
"\n");
printf("Report bugs to tinc@tinc-vpn.org.\n");
}
case 'c': /* config file */
confbase = xstrdup(optarg);
+ confbasegiven = true;
break;
case 'n': /* net name given */
/* Check stdin and stdout */
if(ask && tty) {
/* Ask for a file and/or directory name. */
- fprintf(stdout, "Please enter a file to save %s to [%s]: ",
- what, filename);
+ fprintf(stdout, "Please enter a file to save %s to [%s]: ", what, filename);
fflush(stdout);
if(fgets(buf, sizeof buf, stdin) == NULL) {
- fprintf(stderr, "Error while reading stdin: %s\n",
- strerror(errno));
+ fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
return NULL;
}
return true;
}
-static char buffer[4096];
-static size_t blen = 0;
+char buffer[4096];
+size_t blen = 0;
bool recvline(int fd, char *line, size_t len) {
char *newline = NULL;
+ if(!fd)
+abort();
while(!(newline = memchr(buffer, '\n', blen))) {
int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
if(result == -1 && errno == EINTR)
return true;
}
-static bool recvdata(int fd, char *data, size_t len) {
+bool recvdata(int fd, char *data, size_t len) {
+ if(len == -1)
+ len = blen;
+
while(blen < len) {
int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
if(result == -1 && errno == EINTR)
}
#endif
-static bool connect_tincd(bool verbose) {
+bool connect_tincd(bool verbose) {
if(fd >= 0) {
fd_set r;
FD_ZERO(&r);
return 0;
}
-static int rstrip(char *value) {
+int rstrip(char *value) {
int len = strlen(value);
while(len && strchr("\t\r\n ", value[len - 1]))
value[--len] = 0;
return len;
}
-static char *get_my_name(bool verbose) {
+char *get_my_name(bool verbose) {
FILE *f = fopen(tinc_conf, "r");
if(!f) {
if(verbose)
return NULL;
}
-#define VAR_SERVER 1 /* Should be in tinc.conf */
-#define VAR_HOST 2 /* Can be in host config file */
-#define VAR_MULTIPLE 4 /* Multiple statements allowed */
-#define VAR_OBSOLETE 8 /* Should not be used anymore */
-
-static struct {
- const char *name;
- int type;
-} const variables[] = {
+const var_t variables[] = {
/* Server configuration */
{"AddressFamily", VAR_SERVER},
- {"AutoConnect", VAR_SERVER},
+ {"AutoConnect", VAR_SERVER | VAR_SAFE},
{"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
{"BindToInterface", VAR_SERVER},
- {"Broadcast", VAR_SERVER},
- {"ConnectTo", VAR_SERVER | VAR_MULTIPLE},
+ {"Broadcast", VAR_SERVER | VAR_SAFE},
+ {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
{"DecrementTTL", VAR_SERVER},
{"Device", VAR_SERVER},
{"DeviceType", VAR_SERVER},
{"MACExpire", VAR_SERVER},
{"MaxOutputBufferSize", VAR_SERVER},
{"MaxTimeout", VAR_SERVER},
- {"Mode", VAR_SERVER},
+ {"Mode", VAR_SERVER | VAR_SAFE},
{"Name", VAR_SERVER},
{"PingInterval", VAR_SERVER},
{"PingTimeout", VAR_SERVER},
{"Port", VAR_HOST},
{"PublicKey", VAR_HOST | VAR_OBSOLETE},
{"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
- {"Subnet", VAR_HOST | VAR_MULTIPLE},
+ {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
{"TCPOnly", VAR_SERVER | VAR_HOST},
- {"Weight", VAR_HOST},
+ {"Weight", VAR_HOST | VAR_SAFE},
{NULL, 0}
};
{"import", cmd_import},
{"exchange", cmd_exchange},
{"exchange-all", cmd_exchange_all},
+ {"invite", cmd_invite},
+ {"join", cmd_join},
{NULL, NULL},
};
if(dot) {
if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
char *match;
- xasprintf(&match, "%.*s.%s", dot - text, text, variables[i].name);
+ xasprintf(&match, "%.*s.%s", (int)(dot - text), text, variables[i].name);
return match;
}
} else {
return 0;
}
+ crypto_init();
+
tty = isatty(0) && isatty(1);
if(optind >= argc)
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