/*
invitation.c -- Create and accept invitations
- Copyright (C) 2013-2014 Guus Sliepen <guus@tinc-vpn.org>
+ Copyright (C) 2013-2015 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 "crypto.h"
#include "ecdsa.h"
#include "ecdsagen.h"
+#include "ifconfig.h"
#include "invitation.h"
#include "names.h"
#include "netutl.h"
#include "rsagen.h"
#include "script.h"
#include "sptps.h"
+#include "subnet.h"
#include "tincctl.h"
#include "utils.h"
#include "xalloc.h"
+#include "ed25519/sha512.h"
+
int addressfamily = AF_UNSPEC;
static void scan_for_hostname(const char *filename, char **hostname, char **port) {
char *port = NULL;
char *hostport = NULL;
char *name = get_my_name(false);
- char *filename = NULL;
+ char filename[PATH_MAX] = {0};
// Use first Address statement in own host config file
if(check_id(name)) {
- xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
+ snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
scan_for_hostname(filename, &hostname, &port);
scan_for_hostname(tinc_conf, &hostname, &port);
}
hostname = xstrdup(line);
save:
- if(filename) {
+ if(*filename) {
FILE *f = fopen(filename, "a");
if(f) {
fprintf(f, "\nAddress = %s\n", hostname);
free(hostname);
free(port);
- free(filename);
return hostport;
}
return 1;
// Ensure no host configuration file with that name exists
- char *filename = NULL;
- xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, argv[1]);
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof 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 know about this name
bool found = false;
}
}
- char hash[25];
-
- xasprintf(&filename, "%s" SLASH "invitations", confbase);
+ snprintf(filename, sizeof 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;
}
DIR *dir = opendir(filename);
if(!dir) {
fprintf(stderr, "Could not read directory %s: %s\n", filename, strerror(errno));
- free(filename);
return 1;
}
while((ent = readdir(dir))) {
if(strlen(ent->d_name) != 24)
continue;
- char *invname;
+ char invname[PATH_MAX];
struct stat st;
- xasprintf(&invname, "%s" SLASH "%s", filename, ent->d_name);
+ snprintf(invname, sizeof invname, "%s" SLASH "%s", filename, ent->d_name);
if(!stat(invname, &st)) {
if(deadline < st.st_mtime)
count++;
fprintf(stderr, "Could not stat %s: %s\n", invname, strerror(errno));
errno = 0;
}
- free(invname);
}
+ closedir(dir);
+
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 "ed25519_key.priv", confbase);
+ snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
// Remove the key if there are no outstanding invitations.
if(!count)
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);
+ if(!key)
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);
+ if(!ecdsa_write_pem_private_key(key, f)) {
+ fprintf(stderr, "Could not write ECDSA private key\n");
+ fclose(f);
+ return 1;
+ }
fclose(f);
if(connect_tincd(false))
fprintf(stderr, "Could not read private key from %s\n", filename);
}
- free(filename);
if(!key)
return 1;
// Create a hash of the key.
+ char hash[64];
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);
+ sha512(fingerprint, strlen(fingerprint), hash);
b64encode_urlsafe(hash, hash, 18);
// Create a random cookie for this invitation.
// Create a filename that doesn't reveal the cookie itself
char buf[18 + strlen(fingerprint)];
- char cookiehash[25];
+ char cookiehash[64];
memcpy(buf, cookie, 18);
memcpy(buf + 18, fingerprint, sizeof buf - 18);
- digest_create(digest, buf, sizeof buf, cookiehash);
+ sha512(buf, sizeof buf, cookiehash);
b64encode_urlsafe(cookiehash, cookiehash, 18);
b64encode_urlsafe(cookie, cookie, 18);
// Create a file containing the details of the invitation.
- xasprintf(&filename, "%s" SLASH "invitations" SLASH "%s", confbase, cookiehash);
+ snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "%s", confbase, cookiehash);
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;
}
f = fdopen(ifd, "w");
fprintf(f, "#---------------------------------------------------------------#\n");
fprintf(f, "Name = %s\n", myname);
- char *filename2;
- xasprintf(&filename2, "%s" SLASH "hosts" SLASH "%s", confbase, myname);
+ char filename2[PATH_MAX];
+ snprintf(filename2, sizeof filename2, "%s" SLASH "hosts" SLASH "%s", confbase, myname);
fcopy(f, filename2);
fclose(f);
- free(filename2);
// Create an URL from the local address, key hash and cookie
char *url;
puts(url);
free(url);
- free(filename);
free(address);
return 0;
confbase = NULL;
}
- make_names();
+ make_names(false);
free(tinc_conf);
free(hosts_dir);
fprintf(f, "Name = %s\n", name);
- char *filename;
- xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof 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;
}
+ snprintf(filename, sizeof filename, "%s" SLASH "tinc-up.invitation", confbase);
+ FILE *fup = fopen(filename, "w");
+ if(!fup) {
+ fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
+ fclose(f);
+ fclose(fh);
+ return false;
+ }
+
+ fprintf(fup, "#!/bin/sh\n");
+ long fuppos = ftell(fup);
+
// Filter first chunk on approved keywords, split between tinc.conf and hosts/Name
+ // Generate a tinc-up script from Ifconfig and Route keywords.
// Other chunks go unfiltered to their respective host config files
const char *p = data;
char *l, *value;
break;
}
+ // Handle Ifconfig and Route statements
+ if(!found) {
+ if(!strcasecmp(l, "Ifconfig")) {
+ if(!strcasecmp(value, "dhcp"))
+ ifconfig_dhcp(fup);
+ else if(!strcasecmp(value, "dhcp6"))
+ ifconfig_dhcp6(fup);
+ else if(!strcasecmp(value, "slaac"))
+ ifconfig_slaac(fup);
+ else
+ ifconfig_address(fup, value);
+ continue;
+ } else if(!strcasecmp(l, "Route")) {
+ ifconfig_route(fup, value);
+ continue;
+ }
+ }
+
// Ignore unknown and unsafe variables
if(!found) {
fprintf(stderr, "Ignoring unknown variable '%s' in invitation.\n", l);
}
fclose(f);
- free(filename);
+ bool valid_tinc_up = ifconfig_footer(fup);
+ fclose(fup);
while(l && !strcasecmp(l, "Name")) {
if(!check_id(value)) {
return false;
}
- xasprintf(&filename, "%s" SLASH "%s", hosts_dir, value);
+ snprintf(filename, sizeof filename, "%s" SLASH "%s", hosts_dir, value);
f = fopen(filename, "w");
if(!f) {
}
fclose(f);
- free(filename);
}
// Generate our key and send a copy to the server
if(!b64key)
return false;
- xasprintf(&filename, "%s" SLASH "ed25519_key.priv", confbase);
+ snprintf(filename, sizeof filename, "%s" SLASH "ed25519_key.priv", confbase);
f = fopenmask(filename, "w", 0600);
+ if(!f)
+ return false;
if(!ecdsa_write_pem_private_key(key, f)) {
fprintf(stderr, "Error writing private key!\n");
sptps_send_record(&sptps, 1, b64key, strlen(b64key));
free(b64key);
+ ecdsa_free(key);
-
+#ifndef DISABLE_LEGACY
rsa_t *rsa = rsa_generate(2048, 0x1001);
- xasprintf(&filename, "%s" SLASH "rsa_key.priv", confbase);
+ snprintf(filename, sizeof filename, "%s" SLASH "rsa_key.priv", confbase);
f = fopenmask(filename, "w", 0600);
- rsa_write_pem_private_key(rsa, f);
+ if(!f || !rsa_write_pem_private_key(rsa, f)) {
+ fprintf(stderr, "Could not write private RSA key\n");
+ } else if(!rsa_write_pem_public_key(rsa, fh)) {
+ fprintf(stderr, "Could not write public RSA key\n");
+ }
+
fclose(f);
- rsa_write_pem_public_key(rsa, fh);
fclose(fh);
- ecdsa_free(key);
rsa_free(rsa);
+#endif
check_port(name);
line[strlen(line) - 1] = 0;
- char *newbase;
- xasprintf(&newbase, CONFDIR SLASH "tinc" SLASH "%s", line);
+ char newbase[PATH_MAX];
+ snprintf(newbase, sizeof newbase, CONFDIR SLASH "tinc" SLASH "%s", line);
if(rename(confbase, newbase)) {
fprintf(stderr, "Error trying to rename %s to %s: %s\n", confbase, newbase, strerror(errno));
- free(newbase);
goto ask_netname;
}
- free(newbase);
netname = line;
- make_names();
+ make_names(false);
+ }
+
+ char filename2[PATH_MAX];
+ snprintf(filename, sizeof filename, "%s" SLASH "tinc-up.invitation", confbase);
+ snprintf(filename2, sizeof filename2, "%s" SLASH "tinc-up", confbase);
+
+ if(valid_tinc_up) {
+ if(tty) {
+ FILE *fup = fopen(filename, "r");
+ if(fup) {
+ fprintf(stderr, "\nPlease review the following tinc-up script:\n\n");
+
+ char buf[MAXSIZE];
+ while(fgets(buf, sizeof buf, fup))
+ fputs(buf, stderr);
+ fclose(fup);
+
+ int response = 0;
+ do {
+ fprintf(stderr, "\nDo you want to use this script [y]es/[n]o/[e]dit? ");
+ response = tolower(getchar());
+ } while(!strchr("yne", response));
+
+ fprintf(stderr, "\n");
+
+ if(response == 'e') {
+ char *command;
+#ifndef HAVE_MINGW
+ xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
+#else
+ xasprintf(&command, "edit \"%s\"", filename);
+#endif
+ if(system(command))
+ response = 'n';
+ else
+ response = 'y';
+ free(command);
+ }
+
+ if(response == 'y') {
+ rename(filename, filename2);
+ chmod(filename2, 0755);
+ fprintf(stderr, "tinc-up enabled.\n");
+ } else {
+ fprintf(stderr, "tinc-up has been left disabled.\n");
+ }
+ }
+ } else {
+ fprintf(stderr, "A tinc-up script was generated, but has been left disabled.\n");
+ }
+ } else {
+ // A placeholder was generated.
+ rename(filename, filename2);
+ chmod(filename2, 0755);
}
fprintf(stderr, "Configuration stored in: %s\n", confbase);
}
-static bool invitation_send(void *handle, uint8_t type, const char *data, size_t len) {
+static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
while(len) {
int result = send(sock, data, len, 0);
if(result == -1 && errno == EINTR)
return true;
}
-static bool invitation_receive(void *handle, uint8_t type, const char *msg, uint16_t len) {
+static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
switch(type) {
case SPTPS_HANDSHAKE:
return sptps_send_record(&sptps, 0, cookie, sizeof cookie);
if(!ai)
return 1;
- sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+ struct addrinfo *aip = NULL;
+
+next:
+ if(!aip)
+ aip = ai;
+ else {
+ aip = aip->ai_next;
+ if(!aip)
+ return 1;
+ }
+
+ sock = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
if(sock <= 0) {
fprintf(stderr, "Could not open socket: %s\n", strerror(errno));
- return 1;
+ goto next;
}
- if(connect(sock, ai->ai_addr, ai->ai_addrlen)) {
- fprintf(stderr, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
+ if(connect(sock, aip->ai_addr, aip->ai_addrlen)) {
+ char *addrstr, *portstr;
+ sockaddr2str((sockaddr_t *)aip->ai_addr, &addrstr, &portstr);
+ fprintf(stderr, "Could not connect to %s port %s: %s\n", addrstr, portstr, strerror(errno));
+ free(addrstr);
+ free(portstr);
closesocket(sock);
- return 1;
+ goto next;
}
fprintf(stderr, "Connected to %s port %s...\n", address, port);
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;
+ goto next;
}
char hisname[4096] = "";
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;
+ goto next;
}
// Check if the hash of the key he gave 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)) {
+ char hishash[64];
+ if(sha512(fingerprint, strlen(fingerprint), hishash)) {
fprintf(stderr, "Could not create digest\n%s\n", line + 2);
return 1;
}
return 1;
}
- if(!sptps_receive_data(&sptps, line, len))
- return 1;
+ char *p = line;
+ while(len) {
+ int done = sptps_receive_data(&sptps, p, len);
+ if(!done)
+ return 1;
+ len -= done;
+ p += done;
+ }
}
sptps_stop(&sptps);
projects / tinc / blobdiff