/mandos/trunk : revision 505.3.1

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* "browse_callback", and parts of "main".

10

*

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* Everything else is

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*

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* This program is free software: you can redistribute it and/or

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* modify it under the terms of the GNU General Public License as

32

/* Needed by GPGME, specifically gpgme_data_seek() */

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#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

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#include <stdio.h> /* fprintf(), stderr, fwrite(),

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stdout, ferror() */

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#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

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stdout, ferror(), remove() */

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#include <stdint.h> /* uint16_t, uint32_t */

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#include <stddef.h> /* NULL, size_t, ssize_t */

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#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

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strtof(), abort() */

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#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* strcmp(), strlen(), strerror(),

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asprintf(), strcpy() */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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#include <sys/ioctl.h> /* ioctl */

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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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opendir(), DIR */

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#include <sys/stat.h> /* open(), S_ISREG */

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#include <sys/socket.h> /* socket(), struct sockaddr_in6,

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inet_pton(), connect(),

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getnameinfo() */

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#include <fcntl.h> /* open(), unlinkat() */

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inet_pton(), connect() */

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#include <fcntl.h> /* open() */

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#include <dirent.h> /* opendir(), struct dirent, readdir()

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*/

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#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

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strtoimax() */

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#include <assert.h> /* assert() */

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#include <errno.h> /* perror(), errno,

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program_invocation_short_name */

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#include <time.h> /* nanosleep(), time(), sleep() */

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*/

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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

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getuid(), getgid(), seteuid(),

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setgid(), pause(), _exit(),

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unlinkat() */

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#include <arpa/inet.h> /* inet_pton(), htons() */

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setgid(), pause() */

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#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

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#include <iso646.h> /* not, or, and */

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#include <argp.h> /* struct argp_option, error_t, struct

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argp_state, struct argp,

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raise() */

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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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#include <sys/wait.h> /* waitpid(), WIFEXITED(),

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WEXITSTATUS(), WTERMSIG() */

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#include <grp.h> /* setgroups() */

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#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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90

#include <sys/klog.h> /* klogctl() */

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108

init_gnutls_session(),

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109

GNUTLS_* */

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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#include <gpgme.h> /* All GPGME types, constants and

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const char *argp_program_bug_address = "<mandos@recompile.se>";

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static const char sys_class_net[] = "/sys/class/net";

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char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

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int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

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134

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/* Doubly linked list that need to be circularly linked when used */

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typedef struct server{

151

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const char *ip;

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in_port_t port;

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uint16_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

159

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/* Used for passing in values through the Avahi callback functions */

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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unsigned int dh_bits;

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153

const char *priority;

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154

gpgme_ctx_t ctx;

168

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server *current_server;

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char *interfaces;

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size_t interfaces_size;

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156

} mandos_context;

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157

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/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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/* global context so signal handler can reach it*/

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mandos_context mc = { .simple_poll = NULL, .server = NULL,

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.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP",

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.current_server = NULL };

175

163

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164

sig_atomic_t quit_now = 0;

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int signal_received = 0;

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179

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/* Function to use when printing errors */

180

168

void perror_plus(const char *print_text){

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int e = errno;

182

169

fprintf(stderr, "Mandos plugin %s: ",

183

170

program_invocation_short_name);

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errno = e;

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171

perror(print_text);

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172

}

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__attribute__((format (gnu_printf, 2, 3), nonnull))

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int fprintf_plus(FILE *stream, const char *format, ...){

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va_list ap;

191

va_start (ap, format);

192

193

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

194

program_invocation_short_name));

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return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

196

}

197

198

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/*

199

175

* Make additional room in "buffer" for at least BUFFER_SIZE more

200

176

* bytes. "buffer_capacity" is how much is currently allocated,

201

177

* "buffer_length" is how much is already used.

202

178

*/

203

__attribute__((nonnull, warn_unused_result))

204

179

size_t incbuffer(char **buffer, size_t buffer_length,

205

size_t buffer_capacity){

180

size_t buffer_capacity){

206

181

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

182

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

183

if(buffer == NULL){

213

184

return 0;

214

185

}

215

*buffer = new_buf;

216

186

buffer_capacity += BUFFER_SIZE;

217

187

}

218

188

return buffer_capacity;

219

189

}

220

190

221

191

/* Add server to set of servers to retry periodically */

222

__attribute__((nonnull, warn_unused_result))

223

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

224

int af, server **current_server){

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

225

195

int ret;

226

196

server *new_server = malloc(sizeof(server));

227

197

if(new_server == NULL){

228

198

perror_plus("malloc");

229

return false;

199

return -1;

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200

}

231

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*new_server = (server){ .ip = strdup(ip),

232

.port = port,

233

.if_index = if_index,

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.af = af };

202

.port = port,

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.if_index = if_index,

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.af = af };

235

205

if(new_server->ip == NULL){

236

206

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

return false;

207

return -1;

253

208

}

254

209

/* Special case of first server */

255

if(*current_server == NULL){

210

if (mc.current_server == NULL){

256

211

new_server->next = new_server;

257

212

new_server->prev = new_server;

258

*current_server = new_server;

213

mc.current_server = new_server;

214

/* Place the new server last in the list */

259

215

} else {

260

/* Place the new server last in the list */

261

new_server->next = *current_server;

262

new_server->prev = (*current_server)->prev;

216

new_server->next = mc.current_server;

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new_server->prev = mc.current_server->prev;

263

218

new_server->prev->next = new_server;

264

(*current_server)->prev = new_server;

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}

266

return true;

219

mc.current_server->prev = new_server;

220

}

221

ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

267

227

}

268

228

269

229

/*

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* Initialize GPGME.

271

231

*/

272

__attribute__((nonnull, warn_unused_result))

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static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

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const char * const tempdir,

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mandos_context *mc){

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

277

234

gpgme_error_t rc;

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235

gpgme_engine_info_t engine_info;

279

236

237

280

238

/*

281

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* Helper function to insert pub and seckey to the engine keyring.

282

240

*/

283

bool import_key(const char * const filename){

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bool import_key(const char *filename){

284

242

int ret;

285

243

int fd;

286

244

gpgme_data_t pgp_data;

293

251

294

252

rc = gpgme_data_new_from_fd(&pgp_data, fd);

295

253

if(rc != GPG_ERR_NO_ERROR){

296

fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

299

257

}

300

258

301

rc = gpgme_op_import(mc->ctx, pgp_data);

259

rc = gpgme_op_import(mc.ctx, pgp_data);

302

260

if(rc != GPG_ERR_NO_ERROR){

303

fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

261

fprintf(stderr, "bad gpgme_op_import: %s: %s\n",

262

gpgme_strsource(rc), gpgme_strerror(rc));

305

263

return false;

306

264

}

307

265

308

ret = close(fd);

266

ret = (int)TEMP_FAILURE_RETRY(close(fd));

309

267

if(ret == -1){

310

268

perror_plus("close");

311

269

}

314

272

}

315

273

316

274

if(debug){

317

fprintf_plus(stderr, "Initializing GPGME\n");

275

fprintf(stderr, "Initializing GPGME\n");

318

276

}

319

277

320

278

/* Init GPGME */

321

279

gpgme_check_version(NULL);

322

280

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

323

281

if(rc != GPG_ERR_NO_ERROR){

324

fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",

325

gpgme_strsource(rc), gpgme_strerror(rc));

282

fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",

283

gpgme_strsource(rc), gpgme_strerror(rc));

326

284

return false;

327

285

}

328

286

329

287

/* Set GPGME home directory for the OpenPGP engine only */

330

288

rc = gpgme_get_engine_info(&engine_info);

331

289

if(rc != GPG_ERR_NO_ERROR){

332

fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",

333

gpgme_strsource(rc), gpgme_strerror(rc));

290

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

291

gpgme_strsource(rc), gpgme_strerror(rc));

334

292

return false;

335

293

}

336

294

while(engine_info != NULL){

342

300

engine_info = engine_info->next;

343

301

}

344

302

if(engine_info == NULL){

345

fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

346

tempdir);

303

fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

347

304

return false;

348

305

}

349

306

350

307

/* Create new GPGME "context" */

351

rc = gpgme_new(&(mc->ctx));

308

rc = gpgme_new(&(mc.ctx));

352

309

if(rc != GPG_ERR_NO_ERROR){

353

fprintf_plus(stderr, "Mandos plugin mandos-client: "

354

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

355

gpgme_strerror(rc));

310

fprintf(stderr, "bad gpgme_new: %s: %s\n",

311

gpgme_strsource(rc), gpgme_strerror(rc));

356

312

return false;

357

313

}

358

314

367

323

* Decrypt OpenPGP data.

368

324

* Returns -1 on error

369

325

*/

370

__attribute__((nonnull, warn_unused_result))

371

326

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

327

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

328

char **plaintext){

375

329

gpgme_data_t dh_crypto, dh_plain;

376

330

gpgme_error_t rc;

377

331

ssize_t ret;

379

333

ssize_t plaintext_length = 0;

380

334

381

335

if(debug){

382

fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");

336

fprintf(stderr, "Trying to decrypt OpenPGP data\n");

383

337

}

384

338

385

339

/* Create new GPGME data buffer from memory cryptotext */

386

340

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

387

341

0);

388

342

if(rc != GPG_ERR_NO_ERROR){

389

fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

390

gpgme_strsource(rc), gpgme_strerror(rc));

343

fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

344

gpgme_strsource(rc), gpgme_strerror(rc));

391

345

return -1;

392

346

}

393

347

394

348

/* Create new empty GPGME data buffer for the plaintext */

395

349

rc = gpgme_data_new(&dh_plain);

396

350

if(rc != GPG_ERR_NO_ERROR){

397

fprintf_plus(stderr, "Mandos plugin mandos-client: "

398

"bad gpgme_data_new: %s: %s\n",

399

gpgme_strsource(rc), gpgme_strerror(rc));

351

fprintf(stderr, "bad gpgme_data_new: %s: %s\n",

352

gpgme_strsource(rc), gpgme_strerror(rc));

400

353

gpgme_data_release(dh_crypto);

401

354

return -1;

402

355

}

403

356

404

357

/* Decrypt data from the cryptotext data buffer to the plaintext

405

358

data buffer */

406

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

359

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

407

360

if(rc != GPG_ERR_NO_ERROR){

408

fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",

409

gpgme_strsource(rc), gpgme_strerror(rc));

361

fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",

362

gpgme_strsource(rc), gpgme_strerror(rc));

410

363

plaintext_length = -1;

411

364

if(debug){

412

365

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

366

result = gpgme_op_decrypt_result(mc.ctx);

414

367

if(result == NULL){

415

fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");

368

fprintf(stderr, "gpgme_op_decrypt_result failed\n");

416

369

} else {

417

fprintf_plus(stderr, "Unsupported algorithm: %s\n",

418

result->unsupported_algorithm);

419

fprintf_plus(stderr, "Wrong key usage: %u\n",

420

result->wrong_key_usage);

370

fprintf(stderr, "Unsupported algorithm: %s\n",

371

result->unsupported_algorithm);

372

fprintf(stderr, "Wrong key usage: %u\n",

373

result->wrong_key_usage);

421

374

if(result->file_name != NULL){

422

fprintf_plus(stderr, "File name: %s\n", result->file_name);

375

fprintf(stderr, "File name: %s\n", result->file_name);

423

376

}

424

377

gpgme_recipient_t recipient;

425

378

recipient = result->recipients;

426

379

while(recipient != NULL){

427

fprintf_plus(stderr, "Public key algorithm: %s\n",

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);

431

fprintf_plus(stderr, "Secret key available: %s\n",

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

380

fprintf(stderr, "Public key algorithm: %s\n",

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

383

fprintf(stderr, "Secret key available: %s\n",

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

434

386

recipient = recipient->next;

435

387

}

436

388

}

439

391

}

440

392

441

393

if(debug){

442

fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");

394

fprintf(stderr, "Decryption of OpenPGP data succeeded\n");

443

395

}

444

396

445

397

/* Seek back to the beginning of the GPGME plaintext data buffer */

452

404

*plaintext = NULL;

453

405

while(true){

454

406

plaintext_capacity = incbuffer(plaintext,

455

(size_t)plaintext_length,

456

plaintext_capacity);

407

(size_t)plaintext_length,

408

plaintext_capacity);

457

409

if(plaintext_capacity == 0){

458

perror_plus("incbuffer");

459

plaintext_length = -1;

460

goto decrypt_end;

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

461

413

}

462

414

463

415

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

476

428

}

477

429

478

430

if(debug){

479

fprintf_plus(stderr, "Decrypted password is: ");

431

fprintf(stderr, "Decrypted password is: ");

480

432

for(ssize_t i = 0; i < plaintext_length; i++){

481

433

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

482

434

}

493

445

return plaintext_length;

494

446

}

495

447

496

__attribute__((warn_unused_result, const))

497

static const char *safe_string(const char *str){

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

505

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

448

static const char * safer_gnutls_strerror(int value){

449

const char *ret = gnutls_strerror(value); /* Spurious warning from

450

-Wunreachable-code */

451

if(ret == NULL)

452

ret = "(unknown)";

453

return ret;

507

454

}

508

455

509

456

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

457

static void debuggnutls(__attribute__((unused)) int level,

512

458

const char* string){

513

fprintf_plus(stderr, "GnuTLS: %s", string);

459

fprintf(stderr, "GnuTLS: %s", string);

514

460

}

515

461

516

__attribute__((nonnull, warn_unused_result))

517

462

static int init_gnutls_global(const char *pubkeyfilename,

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

463

const char *seckeyfilename){

521

464

int ret;

522

unsigned int uret;

523

465

524

466

if(debug){

525

fprintf_plus(stderr, "Initializing GnuTLS\n");

467

fprintf(stderr, "Initializing GnuTLS\n");

526

468

}

527

469

528

470

ret = gnutls_global_init();

529

471

if(ret != GNUTLS_E_SUCCESS){

530

fprintf_plus(stderr, "GnuTLS global_init: %s\n",

531

safer_gnutls_strerror(ret));

472

fprintf(stderr, "GnuTLS global_init: %s\n",

473

safer_gnutls_strerror(ret));

532

474

return -1;

533

475

}

534

476

541

483

}

542

484

543

485

/* OpenPGP credentials */

544

ret = gnutls_certificate_allocate_credentials(&mc->cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

545

487

if(ret != GNUTLS_E_SUCCESS){

546

fprintf_plus(stderr, "GnuTLS memory error: %s\n",

547

safer_gnutls_strerror(ret));

488

fprintf(stderr, "GnuTLS memory error: %s\n",

489

safer_gnutls_strerror(ret));

548

490

gnutls_global_deinit();

549

491

return -1;

550

492

}

551

493

552

494

if(debug){

553

fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"

554

" secret key %s as GnuTLS credentials\n",

555

pubkeyfilename,

556

seckeyfilename);

495

fprintf(stderr, "Attempting to use OpenPGP public key %s and"

496

" secret key %s as GnuTLS credentials\n", pubkeyfilename,

497

seckeyfilename);

557

498

}

558

499

559

500

ret = gnutls_certificate_set_openpgp_key_file

560

(mc->cred, pubkeyfilename, seckeyfilename,

501

(mc.cred, pubkeyfilename, seckeyfilename,

561

502

GNUTLS_OPENPGP_FMT_BASE64);

562

503

if(ret != GNUTLS_E_SUCCESS){

563

fprintf_plus(stderr,

564

"Error[%d] while reading the OpenPGP key pair ('%s',"

565

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

566

fprintf_plus(stderr, "The GnuTLS error is: %s\n",

567

safer_gnutls_strerror(ret));

504

fprintf(stderr,

505

"Error[%d] while reading the OpenPGP key pair ('%s',"

506

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

507

fprintf(stderr, "The GnuTLS error is: %s\n",

508

safer_gnutls_strerror(ret));

568

509

goto globalfail;

569

510

}

570

511

571

512

/* GnuTLS server initialization */

572

ret = gnutls_dh_params_init(&mc->dh_params);

573

if(ret != GNUTLS_E_SUCCESS){

574

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

575

" initialization: %s\n",

576

safer_gnutls_strerror(ret));

577

goto globalfail;

578

}

579

/* If a Diffie-Hellman parameters file was given, try to use it */

580

if(dhparamsfilename != NULL){

581

gnutls_datum_t params = { .data = NULL, .size = 0 };

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

params_capacity = incbuffer((char **)&params.data,

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

if(params.data == NULL){

619

dhparamsfilename = NULL;

620

}

621

if(dhparamsfilename == NULL){

622

break;

623

}

624

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

625

GNUTLS_X509_FMT_PEM);

626

if(ret != GNUTLS_E_SUCCESS){

627

fprintf_plus(stderr, "Failed to parse DH parameters in file"

628

" \"%s\": %s\n", dhparamsfilename,

629

safer_gnutls_strerror(ret));

630

dhparamsfilename = NULL;

631

}

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

/* Find out the optimal number of DH bits */

637

/* Try to read the private key file */

638

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

buffer_capacity = incbuffer((char **)&buffer.data,

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

/* If successful, use buffer to parse private key */

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

689

if(ret != GNUTLS_E_SUCCESS){

690

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

" a GnuTLS security parameter \"%s\".\n",

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

726

" implies %u DH bits; using that.\n",

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

fprintf_plus(stderr, "Failed to get implied number of DH"

733

" bits for security parameter \"%s\"): %s\n",

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

741

mc->dh_bits);

742

}

743

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

744

if(ret != GNUTLS_E_SUCCESS){

745

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

746

" bits): %s\n", mc->dh_bits,

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

751

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

513

ret = gnutls_dh_params_init(&mc.dh_params);

514

if(ret != GNUTLS_E_SUCCESS){

515

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

516

" %s\n", safer_gnutls_strerror(ret));

517

goto globalfail;

518

}

519

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

520

if(ret != GNUTLS_E_SUCCESS){

521

fprintf(stderr, "Error in GnuTLS prime generation: %s\n",

522

safer_gnutls_strerror(ret));

523

goto globalfail;

524

}

525

526

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

752

527

753

528

return 0;

754

529

755

530

globalfail:

756

531

757

gnutls_certificate_free_credentials(mc->cred);

532

gnutls_certificate_free_credentials(mc.cred);

758

533

gnutls_global_deinit();

759

gnutls_dh_params_deinit(mc->dh_params);

534

gnutls_dh_params_deinit(mc.dh_params);

760

535

return -1;

761

536

}

762

537

763

__attribute__((nonnull, warn_unused_result))

764

static int init_gnutls_session(gnutls_session_t *session,

765

mandos_context *mc){

538

static int init_gnutls_session(gnutls_session_t *session){

766

539

int ret;

767

540

/* GnuTLS session creation */

768

541

do {

772

545

}

773

546

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

774

547

if(ret != GNUTLS_E_SUCCESS){

775

fprintf_plus(stderr,

776

"Error in GnuTLS session initialization: %s\n",

777

safer_gnutls_strerror(ret));

548

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

549

safer_gnutls_strerror(ret));

778

550

}

779

551

780

552

{

781

553

const char *err;

782

554

do {

783

ret = gnutls_priority_set_direct(*session, mc->priority, &err);

555

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

784

556

if(quit_now){

785

557

gnutls_deinit(*session);

786

558

return -1;

787

559

}

788

560

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

789

561

if(ret != GNUTLS_E_SUCCESS){

790

fprintf_plus(stderr, "Syntax error at: %s\n", err);

791

fprintf_plus(stderr, "GnuTLS error: %s\n",

792

safer_gnutls_strerror(ret));

562

fprintf(stderr, "Syntax error at: %s\n", err);

563

fprintf(stderr, "GnuTLS error: %s\n",

564

safer_gnutls_strerror(ret));

793

565

gnutls_deinit(*session);

794

566

return -1;

795

567

}

797

569

798

570

do {

799

571

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

800

mc->cred);

572

mc.cred);

801

573

if(quit_now){

802

574

gnutls_deinit(*session);

803

575

return -1;

804

576

}

805

577

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

806

578

if(ret != GNUTLS_E_SUCCESS){

807

fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",

808

safer_gnutls_strerror(ret));

579

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

580

safer_gnutls_strerror(ret));

809

581

gnutls_deinit(*session);

810

582

return -1;

811

583

}

813

585

/* ignore client certificate if any. */

814

586

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

815

587

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

589

816

590

return 0;

817

591

}

818

592

820

594

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

821

595

__attribute__((unused)) const char *txt){}

822

596

823

/* Set effective uid to 0, return errno */

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

if(seteuid(0) == -1){

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

/* Set effective and real user ID to 0. Return errno. */

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

if(setuid(0) == -1){

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

/* Set effective user ID to unprivileged saved user ID */

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

if(seteuid(uid) == -1){

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

if(setuid(uid) == -1){

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

875

/* Helper function to add_local_route() and delete_local_route() */

876

__attribute__((nonnull, warn_unused_result))

877

static bool add_delete_local_route(const bool add,

878

const char *address,

879

AvahiIfIndex if_index){

880

int ret;

881

char helper[] = "mandos-client-iprouteadddel";

882

char add_arg[] = "add";

883

char delete_arg[] = "delete";

884

char debug_flag[] = "--debug";

885

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

886

if(pluginhelperdir == NULL){

887

if(debug){

888

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

889

" variable not set; cannot run helper\n");

890

}

891

return false;

892

}

893

894

char interface[IF_NAMESIZE];

895

if(if_indextoname((unsigned int)if_index, interface) == NULL){

896

perror_plus("if_indextoname");

897

return false;

898

}

899

900

int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));

901

if(devnull == -1){

902

perror_plus("open(\"/dev/null\", O_RDONLY)");

903

return false;

904

}

905

pid_t pid = fork();

906

if(pid == 0){

907

/* Child */

908

/* Raise privileges */

909

errno = raise_privileges_permanently();

910

if(errno != 0){

911

perror_plus("Failed to raise privileges");

912

/* _exit(EX_NOPERM); */

913

} else {

914

/* Set group */

915

errno = 0;

916

ret = setgid(0);

917

if(ret == -1){

918

perror_plus("setgid");

919

_exit(EX_NOPERM);

920

}

921

/* Reset supplementary groups */

922

errno = 0;

923

ret = setgroups(0, NULL);

924

if(ret == -1){

925

perror_plus("setgroups");

926

_exit(EX_NOPERM);

927

}

928

}

929

ret = dup2(devnull, STDIN_FILENO);

930

if(ret == -1){

931

perror_plus("dup2(devnull, STDIN_FILENO)");

932

_exit(EX_OSERR);

933

}

934

ret = close(devnull);

935

if(ret == -1){

936

perror_plus("close");

937

_exit(EX_OSERR);

938

}

939

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

940

if(ret == -1){

941

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

942

_exit(EX_OSERR);

943

}

944

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

945

O_RDONLY

946

| O_DIRECTORY

947

| O_PATH

948

| O_CLOEXEC));

949

if(helperdir_fd == -1){

950

perror_plus("open");

951

_exit(EX_UNAVAILABLE);

952

}

953

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

954

helper, O_RDONLY));

955

if(helper_fd == -1){

956

perror_plus("openat");

957

close(helperdir_fd);

958

_exit(EX_UNAVAILABLE);

959

}

960

close(helperdir_fd);

961

#ifdef __GNUC__

962

#pragma GCC diagnostic push

963

#pragma GCC diagnostic ignored "-Wcast-qual"

964

#endif

965

if(fexecve(helper_fd, (char *const [])

966

{ helper, add ? add_arg : delete_arg, (char *)address,

967

interface, debug ? debug_flag : NULL, NULL },

968

environ) == -1){

969

#ifdef __GNUC__

970

#pragma GCC diagnostic pop

971

#endif

972

perror_plus("fexecve");

973

_exit(EXIT_FAILURE);

974

}

975

}

976

if(pid == -1){

977

perror_plus("fork");

978

return false;

979

}

980

int status;

981

pid_t pret = -1;

982

errno = 0;

983

do {

984

pret = waitpid(pid, &status, 0);

985

if(pret == -1 and errno == EINTR and quit_now){

986

int errno_raising = 0;

987

if((errno = raise_privileges()) != 0){

988

errno_raising = errno;

989

perror_plus("Failed to raise privileges in order to"

990

" kill helper program");

991

}

992

if(kill(pid, SIGTERM) == -1){

993

perror_plus("kill");

994

}

995

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

996

perror_plus("Failed to lower privileges after killing"

997

" helper program");

998

}

999

return false;

1000

}

1001

} while(pret == -1 and errno == EINTR);

1002

if(pret == -1){

1003

perror_plus("waitpid");

1004

return false;

1005

}

1006

if(WIFEXITED(status)){

1007

if(WEXITSTATUS(status) != 0){

1008

fprintf_plus(stderr, "Error: iprouteadddel exited"

1009

" with status %d\n", WEXITSTATUS(status));

1010

return false;

1011

}

1012

return true;

1013

}

1014

if(WIFSIGNALED(status)){

1015

fprintf_plus(stderr, "Error: iprouteadddel died by"

1016

" signal %d\n", WTERMSIG(status));

1017

return false;

1018

}

1019

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1020

return false;

1021

}

1022

1023

__attribute__((nonnull, warn_unused_result))

1024

static bool add_local_route(const char *address,

1025

AvahiIfIndex if_index){

1026

if(debug){

1027

fprintf_plus(stderr, "Adding route to %s\n", address);

1028

}

1029

return add_delete_local_route(true, address, if_index);

1030

}

1031

1032

__attribute__((nonnull, warn_unused_result))

1033

static bool delete_local_route(const char *address,

1034

AvahiIfIndex if_index){

1035

if(debug){

1036

fprintf_plus(stderr, "Removing route to %s\n", address);

1037

}

1038

return add_delete_local_route(false, address, if_index);

1039

}

1040

1041

597

/* Called when a Mandos server is found */

1042

__attribute__((nonnull, warn_unused_result))

1043

static int start_mandos_communication(const char *ip, in_port_t port,

598

static int start_mandos_communication(const char *ip, uint16_t port,

1044

599

AvahiIfIndex if_index,

1045

int af, mandos_context *mc){

600

int af){

1046

601

int ret, tcp_sd = -1;

1047

602

ssize_t sret;

1048

struct sockaddr_storage to;

603

union {

604

struct sockaddr_in in;

605

struct sockaddr_in6 in6;

606

} to;

1049

607

char *buffer = NULL;

1050

608

char *decrypted_buffer = NULL;

1051

609

size_t buffer_length = 0;

1054

612

int retval = -1;

1055

613

gnutls_session_t session;

1056

614

int pf; /* Protocol family */

1057

bool route_added = false;

1058

615

1059

616

errno = 0;

1060

617

1071

628

pf = PF_INET;

1072

629

break;

1073

630

default:

1074

fprintf_plus(stderr, "Bad address family: %d\n", af);

631

fprintf(stderr, "Bad address family: %d\n", af);

1075

632

errno = EINVAL;

1076

633

return -1;

1077

634

}

1078

635

1079

/* If the interface is specified and we have a list of interfaces */

1080

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

1081

/* Check if the interface is one of the interfaces we are using */

1082

bool match = false;

1083

{

1084

char *interface = NULL;

1085

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

1086

interface))){

1087

if(if_nametoindex(interface) == (unsigned int)if_index){

1088

match = true;

1089

break;

1090

}

1091

}

1092

}

1093

if(not match){

1094

/* This interface does not match any in the list, so we don't

1095

connect to the server */

1096

if(debug){

1097

char interface[IF_NAMESIZE];

1098

if(if_indextoname((unsigned int)if_index, interface) == NULL){

1099

perror_plus("if_indextoname");

1100

} else {

1101

fprintf_plus(stderr, "Skipping server on non-used interface"

1102

" \"%s\"\n",

1103

if_indextoname((unsigned int)if_index,

1104

interface));

1105

}

1106

}

1107

return -1;

1108

}

1109

}

1110

1111

ret = init_gnutls_session(&session, mc);

636

ret = init_gnutls_session(&session);

1112

637

if(ret != 0){

1113

638

return -1;

1114

639

}

1115

640

1116

641

if(debug){

1117

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

1118

PRIuMAX "\n", ip, (uintmax_t)port);

642

fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16

643

"\n", ip, port);

1119

644

}

1120

645

1121

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

1122

647

if(tcp_sd < 0){

1123

648

int e = errno;

1124

649

perror_plus("socket");

1131

656

goto mandos_end;

1132

657

}

1133

658

659

memset(&to, 0, sizeof(to));

1134

660

if(af == AF_INET6){

1135

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1136

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1137

ret = inet_pton(af, ip, &to6->sin6_addr);

661

to.in6.sin6_family = (sa_family_t)af;

662

ret = inet_pton(af, ip, &to.in6.sin6_addr);

1138

663

} else { /* IPv4 */

1139

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1140

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1141

ret = inet_pton(af, ip, &to4->sin_addr);

664

to.in.sin_family = (sa_family_t)af;

665

ret = inet_pton(af, ip, &to.in.sin_addr);

1142

666

}

1143

667

if(ret < 0 ){

1144

668

int e = errno;

1148

672

}

1149

673

if(ret == 0){

1150

674

int e = errno;

1151

fprintf_plus(stderr, "Bad address: %s\n", ip);

675

fprintf(stderr, "Bad address: %s\n", ip);

1152

676

errno = e;

1153

677

goto mandos_end;

1154

678

}

1155

679

if(af == AF_INET6){

1156

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

1157

if(IN6_IS_ADDR_LINKLOCAL

1158

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

680

to.in6.sin6_port = htons(port); /* Spurious warnings from

681

-Wconversion and

682

-Wunreachable-code */

683

684

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

686

-Wunreachable-code*/

1159

687

if(if_index == AVAHI_IF_UNSPEC){

1160

fprintf_plus(stderr, "An IPv6 link-local address is"

1161

" incomplete without a network interface\n");

688

fprintf(stderr, "An IPv6 link-local address is incomplete"

689

" without a network interface\n");

1162

690

errno = EINVAL;

1163

691

goto mandos_end;

1164

692

}

1165

693

/* Set the network interface number as scope */

1166

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

694

to.in6.sin6_scope_id = (uint32_t)if_index;

1167

695

}

1168

696

} else {

1169

((struct sockaddr_in *)&to)->sin_port = htons(port);

697

to.in.sin_port = htons(port); /* Spurious warnings from

698

-Wconversion and

699

-Wunreachable-code */

1170

700

}

1171

701

1172

702

if(quit_now){

1180

710

if(if_indextoname((unsigned int)if_index, interface) == NULL){

1181

711

perror_plus("if_indextoname");

1182

712

} else {

1183

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

1184

"\n", ip, interface, (uintmax_t)port);

713

fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",

714

ip, interface, port);

1185

715

}

1186

716

} else {

1187

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

1188

ip, (uintmax_t)port);

717

fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,

718

port);

1189

719

}

1190

720

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1191

721

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1192

if(af == AF_INET6){

1193

ret = getnameinfo((struct sockaddr *)&to,

1194

sizeof(struct sockaddr_in6),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

} else {

1198

ret = getnameinfo((struct sockaddr *)&to,

1199

sizeof(struct sockaddr_in),

1200

addrstr, sizeof(addrstr), NULL, 0,

1201

NI_NUMERICHOST);

1202

}

1203

if(ret == EAI_SYSTEM){

1204

perror_plus("getnameinfo");

1205

} else if(ret != 0) {

1206

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

1207

} else if(strcmp(addrstr, ip) != 0){

1208

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

1209

}

1210

}

1211

1212

if(quit_now){

1213

errno = EINTR;

1214

goto mandos_end;

1215

}

1216

1217

while(true){

1218

if(af == AF_INET6){

1219

ret = connect(tcp_sd, (struct sockaddr *)&to,

1220

sizeof(struct sockaddr_in6));

1221

} else {

1222

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

1223

sizeof(struct sockaddr_in));

1224

}

1225

if(ret < 0){

1226

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1227

and if_index != AVAHI_IF_UNSPEC

1228

and connect_to == NULL

1229

and not route_added and

1230

((af == AF_INET6 and not

1231

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1232

&to)->sin6_addr)))

1233

or (af == AF_INET and

1234

/* Not a a IPv4LL address */

1235

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1236

& 0xFFFF0000L) != 0xA9FE0000L))){

1237

/* Work around Avahi bug - Avahi does not announce link-local

1238

addresses if it has a global address, so local hosts with

1239

*only* a link-local address (e.g. Mandos clients) cannot

1240

connect to a Mandos server announced by Avahi on a server

1241

host with a global address. Work around this by retrying

1242

with an explicit route added with the server's address.

1243

1244

Avahi bug reference:

1245

http://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1246

https://bugs.debian.org/587961

1247

*/

1248

if(debug){

1249

fprintf_plus(stderr, "Mandos server unreachable, trying"

1250

" direct route\n");

1251

}

1252

int e = errno;

1253

route_added = add_local_route(ip, if_index);

1254

if(route_added){

1255

continue;

1256

}

1257

errno = e;

1258

}

1259

if(errno != ECONNREFUSED or debug){

1260

int e = errno;

1261

perror_plus("connect");

1262

errno = e;

1263

}

1264

goto mandos_end;

1265

}

1266

1267

if(quit_now){

1268

errno = EINTR;

1269

goto mandos_end;

1270

}

1271

break;

722

const char *pcret;

723

if(af == AF_INET6){

724

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

725

sizeof(addrstr));

726

} else {

727

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

728

sizeof(addrstr));

729

}

730

if(pcret == NULL){

731

perror_plus("inet_ntop");

732

} else {

733

if(strcmp(addrstr, ip) != 0){

734

fprintf(stderr, "Canonical address form: %s\n", addrstr);

735

}

736

}

737

}

738

739

if(quit_now){

740

errno = EINTR;

741

goto mandos_end;

742

}

743

744

if(af == AF_INET6){

745

ret = connect(tcp_sd, &to.in6, sizeof(to));

746

} else {

747

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

748

}

749

if(ret < 0){

750

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

751

int e = errno;

752

perror_plus("connect");

753

errno = e;

754

}

755

goto mandos_end;

756

}

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

1272

761

}

1273

762

1274

763

const char *out = mandos_protocol_version;

1276

765

while(true){

1277

766

size_t out_size = strlen(out);

1278

767

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

1279

out_size - written));

768

out_size - written));

1280

769

if(ret == -1){

1281

770

int e = errno;

1282

771

perror_plus("write");

1302

791

}

1303

792

1304

793

if(debug){

1305

fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);

794

fprintf(stderr, "Establishing TLS session with %s\n", ip);

1306

795

}

1307

796

1308

797

if(quit_now){

1310

799

goto mandos_end;

1311

800

}

1312

801

1313

/* This casting via intptr_t is to eliminate warning about casting

1314

an int to a pointer type. This is exactly how the GnuTLS Guile

1315

function "set-session-transport-fd!" does it. */

1316

gnutls_transport_set_ptr(session,

1317

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

802

/* Spurious warning from -Wint-to-pointer-cast */

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1318

804

1319

805

if(quit_now){

1320

806

errno = EINTR;

1331

817

1332

818

if(ret != GNUTLS_E_SUCCESS){

1333

819

if(debug){

1334

fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");

820

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

1335

821

gnutls_perror(ret);

1336

822

}

1337

823

errno = EPROTO;

1341

827

/* Read OpenPGP packet that contains the wanted password */

1342

828

1343

829

if(debug){

1344

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

1345

" %s\n", ip);

830

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

831

ip);

1346

832

}

1347

833

1348

834

while(true){

1353

839

}

1354

840

1355

841

buffer_capacity = incbuffer(&buffer, buffer_length,

1356

buffer_capacity);

842

buffer_capacity);

1357

843

if(buffer_capacity == 0){

1358

844

int e = errno;

1359

845

perror_plus("incbuffer");

1386

872

}

1387

873

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

1388

874

if(ret < 0){

1389

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

1390

"***\n");

875

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

1391

876

gnutls_perror(ret);

1392

877

errno = EPROTO;

1393

878

goto mandos_end;

1394

879

}

1395

880

break;

1396

881

default:

1397

fprintf_plus(stderr, "Unknown error while reading data from"

1398

" encrypted session with Mandos server\n");

882

fprintf(stderr, "Unknown error while reading data from"

883

" encrypted session with Mandos server\n");

1399

884

gnutls_bye(session, GNUTLS_SHUT_RDWR);

1400

885

errno = EIO;

1401

886

goto mandos_end;

1406

891

}

1407

892

1408

893

if(debug){

1409

fprintf_plus(stderr, "Closing TLS session\n");

894

fprintf(stderr, "Closing TLS session\n");

1410

895

}

1411

896

1412

897

if(quit_now){

1424

909

1425

910

if(buffer_length > 0){

1426

911

ssize_t decrypted_buffer_size;

1427

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1428

&decrypted_buffer, mc);

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

914

&decrypted_buffer);

1429

915

if(decrypted_buffer_size >= 0){

1430

916

1431

917

written = 0;

1441

927

if(ret == 0 and ferror(stdout)){

1442

928

int e = errno;

1443

929

if(debug){

1444

fprintf_plus(stderr, "Error writing encrypted data: %s\n",

1445

strerror(errno));

930

fprintf(stderr, "Error writing encrypted data: %s\n",

931

strerror(errno));

1446

932

}

1447

933

errno = e;

1448

934

goto mandos_end;

1457

943

1458

944

mandos_end:

1459

945

{

1460

if(route_added){

1461

if(not delete_local_route(ip, if_index)){

1462

fprintf_plus(stderr, "Failed to delete local route to %s on"

1463

" interface %d", ip, if_index);

1464

}

1465

}

1466

946

int e = errno;

1467

947

free(decrypted_buffer);

1468

948

free(buffer);

1469

949

if(tcp_sd >= 0){

1470

ret = close(tcp_sd);

950

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

1471

951

}

1472

952

if(ret == -1){

1473

953

if(e == 0){

1485

965

return retval;

1486

966

}

1487

967

1488

__attribute__((nonnull))

1489

968

static void resolve_callback(AvahiSServiceResolver *r,

1490

969

AvahiIfIndex interface,

1491

970

AvahiProtocol proto,

1499

978

AVAHI_GCC_UNUSED AvahiStringList *txt,

1500

979

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1501

980

flags,

1502

void *mc){

1503

if(r == NULL){

1504

return;

1505

}

981

AVAHI_GCC_UNUSED void* userdata){

982

assert(r);

1506

983

1507

984

/* Called whenever a service has been resolved successfully or

1508

985

timed out */

1509

986

1510

987

if(quit_now){

1511

avahi_s_service_resolver_free(r);

1512

988

return;

1513

989

}

1514

990

1515

991

switch(event){

1516

992

default:

1517

993

case AVAHI_RESOLVER_FAILURE:

1518

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1519

"'%s' of type '%s' in domain '%s': %s\n", name, type,

1520

domain,

1521

avahi_strerror(avahi_server_errno

1522

(((mandos_context*)mc)->server)));

994

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

995

" of type '%s' in domain '%s': %s\n", name, type, domain,

996

avahi_strerror(avahi_server_errno(mc.server)));

1523

997

break;

1524

998

1525

999

case AVAHI_RESOLVER_FOUND:

1527

1001

char ip[AVAHI_ADDRESS_STR_MAX];

1528

1002

avahi_address_snprint(ip, sizeof(ip), address);

1529

1003

if(debug){

1530

fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"

1531

PRIdMAX ") on port %" PRIu16 "\n", name,

1532

host_name, ip, (intmax_t)interface, port);

1004

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

1005

PRIdMAX ") on port %" PRIu16 "\n", name, host_name,

1006

ip, (intmax_t)interface, port);

1533

1007

}

1534

int ret = start_mandos_communication(ip, (in_port_t)port,

1535

interface,

1536

avahi_proto_to_af(proto),

1537

mc);

1008

int ret = start_mandos_communication(ip, port, interface,

1009

avahi_proto_to_af(proto));

1538

1010

if(ret == 0){

1539

avahi_simple_poll_quit(simple_poll);

1011

avahi_simple_poll_quit(mc.simple_poll);

1540

1012

} else {

1541

if(not add_server(ip, (in_port_t)port, interface,

1542

avahi_proto_to_af(proto),

1543

&((mandos_context*)mc)->current_server)){

1544

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1545

" list\n", name);

1546

}

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1547

1015

}

1548

1016

}

1549

1017

}

1559

1027

const char *domain,

1560

1028

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1561

1029

flags,

1562

void *mc){

1563

if(b == NULL){

1564

return;

1565

}

1030

AVAHI_GCC_UNUSED void* userdata){

1031

assert(b);

1566

1032

1567

1033

/* Called whenever a new services becomes available on the LAN or

1568

1034

is removed from the LAN */

1575

1041

default:

1576

1042

case AVAHI_BROWSER_FAILURE:

1577

1043

1578

fprintf_plus(stderr, "(Avahi browser) %s\n",

1579

avahi_strerror(avahi_server_errno

1580

(((mandos_context*)mc)->server)));

1581

avahi_simple_poll_quit(simple_poll);

1044

fprintf(stderr, "(Avahi browser) %s\n",

1045

avahi_strerror(avahi_server_errno(mc.server)));

1046

avahi_simple_poll_quit(mc.simple_poll);

1582

1047

return;

1583

1048

1584

1049

case AVAHI_BROWSER_NEW:

1587

1052

the callback function is called the Avahi server will free the

1588

1053

resolver for us. */

1589

1054

1590

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1591

interface, protocol, name, type,

1592

domain, protocol, 0,

1593

resolve_callback, mc) == NULL)

1594

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1595

" %s\n", name,

1596

avahi_strerror(avahi_server_errno

1597

(((mandos_context*)mc)->server)));

1055

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1056

name, type, domain, protocol, 0,

1057

resolve_callback, NULL) == NULL)

1058

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

1059

name, avahi_strerror(avahi_server_errno(mc.server)));

1598

1060

break;

1599

1061

1600

1062

case AVAHI_BROWSER_REMOVE:

1603

1065

case AVAHI_BROWSER_ALL_FOR_NOW:

1604

1066

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1605

1067

if(debug){

1606

fprintf_plus(stderr, "No Mandos server found, still"

1607

" searching...\n");

1068

fprintf(stderr, "No Mandos server found, still searching...\n");

1608

1069

}

1609

1070

break;

1610

1071

}

1619

1080

signal_received = sig;

1620

1081

int old_errno = errno;

1621

1082

/* set main loop to exit */

1622

if(simple_poll != NULL){

1623

avahi_simple_poll_quit(simple_poll);

1083

if(mc.simple_poll != NULL){

1084

avahi_simple_poll_quit(mc.simple_poll);

1624

1085

}

1625

1086

errno = old_errno;

1626

1087

}

1627

1088

1628

__attribute__((nonnull, warn_unused_result))

1629

1089

bool get_flags(const char *ifname, struct ifreq *ifr){

1630

1090

int ret;

1631

error_t ret_errno;

1632

1091

1633

1092

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1634

1093

if(s < 0){

1635

ret_errno = errno;

1636

1094

perror_plus("socket");

1637

errno = ret_errno;

1638

1095

return false;

1639

1096

}

1640

1097

strcpy(ifr->ifr_name, ifname);

1641

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1642

1099

if(ret == -1){

1643

1100

if(debug){

1644

ret_errno = errno;

1645

1101

perror_plus("ioctl SIOCGIFFLAGS");

1646

errno = ret_errno;

1647

1102

}

1648

1103

return false;

1649

1104

}

1650

1105

return true;

1651

1106

}

1652

1107

1653

__attribute__((nonnull, warn_unused_result))

1654

1108

bool good_flags(const char *ifname, const struct ifreq *ifr){

1655

1109

1656

1110

/* Reject the loopback device */

1657

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1658

1112

if(debug){

1659

fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",

1660

ifname);

1113

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1114

ifname);

1661

1115

}

1662

1116

return false;

1663

1117

}

1664

1118

/* Accept point-to-point devices only if connect_to is specified */

1665

1119

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1666

1120

if(debug){

1667

fprintf_plus(stderr, "Accepting point-to-point interface"

1668

" \"%s\"\n", ifname);

1121

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1122

ifname);

1669

1123

}

1670

1124

return true;

1671

1125

}

1672

1126

/* Otherwise, reject non-broadcast-capable devices */

1673

1127

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1674

1128

if(debug){

1675

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1676

" \"%s\"\n", ifname);

1129

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1130

ifname);

1677

1131

}

1678

1132

return false;

1679

1133

}

1680

1134

/* Reject non-ARP interfaces (including dummy interfaces) */

1681

1135

if(ifr->ifr_flags & IFF_NOARP){

1682

1136

if(debug){

1683

fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",

1684

ifname);

1137

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);

1685

1138

}

1686

1139

return false;

1687

1140

}

1688

1141

1689

1142

/* Accept this device */

1690

1143

if(debug){

1691

fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);

1144

fprintf(stderr, "Interface \"%s\" is good\n", ifname);

1692

1145

}

1693

1146

return true;

1694

1147

}

1698

1151

* corresponds to an acceptable network device.

1699

1152

* (This function is passed to scandir(3) as a filter function.)

1700

1153

*/

1701

__attribute__((nonnull, warn_unused_result))

1702

1154

int good_interface(const struct dirent *if_entry){

1703

1155

if(if_entry->d_name[0] == '.'){

1704

1156

return 0;

1707

1159

struct ifreq ifr;

1708

1160

if(not get_flags(if_entry->d_name, &ifr)){

1709

1161

if(debug){

1710

fprintf_plus(stderr, "Failed to get flags for interface "

1711

"\"%s\"\n", if_entry->d_name);

1712

}

1713

return 0;

1714

}

1715

1716

if(not good_flags(if_entry->d_name, &ifr)){

1717

return 0;

1718

}

1719

return 1;

1720

}

1721

1722

/*

1723

* This function determines if a network interface is up.

1724

*/

1725

__attribute__((nonnull, warn_unused_result))

1726

bool interface_is_up(const char *interface){

1727

struct ifreq ifr;

1728

if(not get_flags(interface, &ifr)){

1729

if(debug){

1730

fprintf_plus(stderr, "Failed to get flags for interface "

1731

"\"%s\"\n", interface);

1732

}

1733

return false;

1734

}

1735

1736

return (bool)(ifr.ifr_flags & IFF_UP);

1737

}

1738

1739

/*

1740

* This function determines if a network interface is running

1741

*/

1742

__attribute__((nonnull, warn_unused_result))

1743

bool interface_is_running(const char *interface){

1744

struct ifreq ifr;

1745

if(not get_flags(interface, &ifr)){

1746

if(debug){

1747

fprintf_plus(stderr, "Failed to get flags for interface "

1748

"\"%s\"\n", interface);

1749

}

1750

return false;

1751

}

1752

1753

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1754

}

1755

1756

__attribute__((nonnull, pure, warn_unused_result))

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

if(not good_flags(if_entry->d_name, &ifr)){

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

* This function determines if a directory entry in /sys/class/net

1176

* corresponds to an acceptable network device which is up.

1177

* (This function is passed to scandir(3) as a filter function.)

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

if(if_entry->d_name[0] == '.'){

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

if(not get_flags(if_entry->d_name, &ifr)){

1186

if(debug){

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

if(not (ifr.ifr_flags & IFF_UP)){

1195

if(debug){

1196

fprintf(stderr, "Rejecting down interface \"%s\"\n",

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

if(not (ifr.ifr_flags & IFF_RUNNING)){

1204

if(debug){

1205

fprintf(stderr, "Rejecting non-running interface \"%s\"\n",

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

if(not good_flags(if_entry->d_name, &ifr)){

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

1757

1217

int notdotentries(const struct dirent *direntry){

1758

1218

/* Skip "." and ".." */

1759

1219

if(direntry->d_name[0] == '.'

1766

1226

}

1767

1227

1768

1228

/* Is this directory entry a runnable program? */

1769

__attribute__((nonnull, warn_unused_result))

1770

1229

int runnable_hook(const struct dirent *direntry){

1771

1230

int ret;

1772

size_t sret;

1773

1231

struct stat st;

1774

1232

1775

1233

if((direntry->d_name)[0] == '\0'){

1777

1235

return 0;

1778

1236

}

1779

1237

1780

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1781

"abcdefghijklmnopqrstuvwxyz"

1782

"0123456789"

1783

"_.-");

1784

if((direntry->d_name)[sret] != '\0'){

1785

/* Contains non-allowed characters */

1786

if(debug){

1787

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1788

direntry->d_name);

1789

}

1790

return 0;

1791

}

1792

1793

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1238

/* Save pointer to last character */

1239

char *end = strchr(direntry->d_name, '\0')-1;

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

if(((direntry->d_name)[0] == '#')

1247

and (*end == '#')){

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

1794

1255

if(ret == -1){

1795

1256

if(debug){

1796

perror_plus("Could not stat hook");

1257

perror_plus("Could not stat plugin");

1797

1258

}

1798

1259

return 0;

1799

1260

}

1800

1261

if(not (S_ISREG(st.st_mode))){

1801

1262

/* Not a regular file */

1802

if(debug){

1803

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1804

direntry->d_name);

1805

}

1806

1263

return 0;

1807

1264

}

1808

1265

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1809

1266

/* Not executable */

1810

if(debug){

1811

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1812

direntry->d_name);

1813

}

1814

1267

return 0;

1815

1268

}

1816

if(debug){

1817

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1818

direntry->d_name);

1819

}

1820

1269

return 1;

1821

1270

}

1822

1271

1823

__attribute__((nonnull, warn_unused_result))

1824

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1825

mandos_context *mc){

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1826

1273

int ret;

1827

1274

struct timespec now;

1828

1275

struct timespec waited_time;

1829

1276

intmax_t block_time;

1830

1277

1831

1278

while(true){

1832

if(mc->current_server == NULL){

1833

if(debug){

1834

fprintf_plus(stderr, "Wait until first server is found."

1835

" No timeout!\n");

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

"Wait until first server is found. No timeout!\n");

1836

1283

}

1837

1284

ret = avahi_simple_poll_iterate(s, -1);

1838

1285

} else {

1839

if(debug){

1840

fprintf_plus(stderr, "Check current_server if we should run"

1841

" it, or wait\n");

1286

if (debug){

1287

fprintf(stderr, "Check current_server if we should run it,"

1288

" or wait\n");

1842

1289

}

1843

1290

/* the current time */

1844

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1849

1296

/* Calculating in ms how long time between now and server

1850

1297

who we visted longest time ago. Now - last seen. */

1851

1298

waited_time.tv_sec = (now.tv_sec

1852

- mc->current_server->last_seen.tv_sec);

1299

- mc.current_server->last_seen.tv_sec);

1853

1300

waited_time.tv_nsec = (now.tv_nsec

1854

- mc->current_server->last_seen.tv_nsec);

1301

- mc.current_server->last_seen.tv_nsec);

1855

1302

/* total time is 10s/10,000ms.

1856

1303

Converting to s from ms by dividing by 1,000,

1857

1304

and ns to ms by dividing by 1,000,000. */

1859

1306

- ((intmax_t)waited_time.tv_sec * 1000))

1860

1307

- ((intmax_t)waited_time.tv_nsec / 1000000));

1861

1308

1862

if(debug){

1863

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1864

block_time);

1309

if (debug){

1310

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1865

1311

}

1866

1312

1867

1313

if(block_time <= 0){

1868

ret = start_mandos_communication(mc->current_server->ip,

1869

mc->current_server->port,

1870

mc->current_server->if_index,

1871

mc->current_server->af, mc);

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1872

1318

if(ret == 0){

1873

avahi_simple_poll_quit(s);

1319

avahi_simple_poll_quit(mc.simple_poll);

1874

1320

return 0;

1875

1321

}

1876

1322

ret = clock_gettime(CLOCK_MONOTONIC,

1877

&mc->current_server->last_seen);

1323

&mc.current_server->last_seen);

1878

1324

if(ret == -1){

1879

1325

perror_plus("clock_gettime");

1880

1326

return -1;

1881

1327

}

1882

mc->current_server = mc->current_server->next;

1328

mc.current_server = mc.current_server->next;

1883

1329

block_time = 0; /* Call avahi to find new Mandos

1884

1330

servers, but don't block */

1885

1331

}

1887

1333

ret = avahi_simple_poll_iterate(s, (int)block_time);

1888

1334

}

1889

1335

if(ret != 0){

1890

if(ret > 0 or errno != EINTR){

1336

if (ret > 0 or errno != EINTR) {

1891

1337

return (ret != 1) ? ret : 0;

1892

1338

}

1893

1339

}

1894

1340

}

1895

1341

}

1896

1342

1897

__attribute__((nonnull))

1898

void run_network_hooks(const char *mode, const char *interface,

1899

const float delay){

1900

struct dirent **direntries = NULL;

1901

if(hookdir_fd == -1){

1902

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1903

| O_CLOEXEC);

1904

if(hookdir_fd == -1){

1905

if(errno == ENOENT){

1906

if(debug){

1907

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1908

" found\n", hookdir);

1909

}

1910

} else {

1911

perror_plus("open");

1912

}

1913

return;

1914

}

1915

}

1916

#ifdef __GLIBC__

1917

#if __GLIBC_PREREQ(2, 15)

1918

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1919

runnable_hook, alphasort);

1920

#else /* not __GLIBC_PREREQ(2, 15) */

1921

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1922

alphasort);

1923

#endif /* not __GLIBC_PREREQ(2, 15) */

1924

#else /* not __GLIBC__ */

1925

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1926

alphasort);

1927

#endif /* not __GLIBC__ */

1928

if(numhooks == -1){

1929

perror_plus("scandir");

1930

return;

1931

}

1932

struct dirent *direntry;

1933

int ret;

1934

int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));

1935

if(devnull == -1){

1936

perror_plus("open(\"/dev/null\", O_RDONLY)");

1937

return;

1938

}

1939

for(int i = 0; i < numhooks; i++){

1940

direntry = direntries[i];

1941

if(debug){

1942

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1943

direntry->d_name);

1944

}

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

ret = setenv("DEVICE", interface, 1);

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

ret = setenv("MODE", mode, 1);

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

ret = asprintf(&delaystring, "%f", (double)delay);

1990

if(ret == -1){

1991

perror_plus("asprintf");

1992

_exit(EX_OSERR);

1993

}

1994

ret = setenv("DELAY", delaystring, 1);

1995

if(ret == -1){

1996

free(delaystring);

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

ret = setenv("CONNECT", connect_to, 1);

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

if(close(hookdir_fd) == -1){

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

perror_plus("dup2(devnull, STDIN_FILENO)");

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

2032

_exit(EX_OSERR);

2033

}

2034

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

2054

" with status %d\n", direntry->d_name,

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

2061

" signal %d\n", direntry->d_name,

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

2065

} else {

2066

fprintf_plus(stderr, "Warning: network hook \"%s\""

2067

" crashed\n", direntry->d_name);

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

if(close(hookdir_fd) == -1){

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

2085

}

2086

2087

__attribute__((nonnull, warn_unused_result))

2088

error_t bring_up_interface(const char *const interface,

2089

const float delay){

2090

error_t old_errno = errno;

2091

int ret;

2092

struct ifreq network;

2093

unsigned int if_index = if_nametoindex(interface);

2094

if(if_index == 0){

2095

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

2096

errno = old_errno;

2097

return ENXIO;

2098

}

2099

2100

if(quit_now){

2101

errno = old_errno;

2102

return EINTR;

2103

}

2104

2105

if(not interface_is_up(interface)){

2106

error_t ret_errno = 0, ioctl_errno = 0;

2107

if(not get_flags(interface, &network)){

2108

ret_errno = errno;

2109

fprintf_plus(stderr, "Failed to get flags for interface "

2110

"\"%s\"\n", interface);

2111

errno = old_errno;

2112

return ret_errno;

2113

}

2114

network.ifr_flags |= IFF_UP; /* set flag */

2115

2116

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

2117

if(sd == -1){

2118

ret_errno = errno;

2119

perror_plus("socket");

2120

errno = old_errno;

2121

return ret_errno;

2122

}

2123

2124

if(quit_now){

2125

ret = close(sd);

2126

if(ret == -1){

2127

perror_plus("close");

2128

}

2129

errno = old_errno;

2130

return EINTR;

2131

}

2132

2133

if(debug){

2134

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

2135

interface);

2136

}

2137

2138

/* Raise privileges */

2139

ret_errno = raise_privileges();

2140

if(ret_errno != 0){

2141

errno = ret_errno;

2142

perror_plus("Failed to raise privileges");

2143

}

2144

2145

#ifdef __linux__

2146

int ret_linux;

2147

bool restore_loglevel = false;

2148

if(ret_errno == 0){

2149

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2150

messages about the network interface to mess up the prompt */

2151

ret_linux = klogctl(8, NULL, 5);

2152

if(ret_linux == -1){

2153

perror_plus("klogctl");

2154

} else {

2155

restore_loglevel = true;

2156

}

2157

}

2158

#endif /* __linux__ */

2159

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2160

ioctl_errno = errno;

2161

#ifdef __linux__

2162

if(restore_loglevel){

2163

ret_linux = klogctl(7, NULL, 0);

2164

if(ret_linux == -1){

2165

perror_plus("klogctl");

2166

}

2167

}

2168

#endif /* __linux__ */

2169

2170

/* If raise_privileges() succeeded above */

2171

if(ret_errno == 0){

2172

/* Lower privileges */

2173

ret_errno = lower_privileges();

2174

if(ret_errno != 0){

2175

errno = ret_errno;

2176

perror_plus("Failed to lower privileges");

2177

}

2178

}

2179

2180

/* Close the socket */

2181

ret = close(sd);

2182

if(ret == -1){

2183

perror_plus("close");

2184

}

2185

2186

if(ret_setflags == -1){

2187

errno = ioctl_errno;

2188

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2189

errno = old_errno;

2190

return ioctl_errno;

2191

}

2192

} else if(debug){

2193

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

2194

interface);

2195

}

2196

2197

/* Sleep checking until interface is running.

2198

Check every 0.25s, up to total time of delay */

2199

for(int i=0; i < delay * 4; i++){

2200

if(interface_is_running(interface)){

2201

break;

2202

}

2203

struct timespec sleeptime = { .tv_nsec = 250000000 };

2204

ret = nanosleep(&sleeptime, NULL);

2205

if(ret == -1 and errno != EINTR){

2206

perror_plus("nanosleep");

2207

}

2208

}

2209

2210

errno = old_errno;

2211

return 0;

2212

}

2213

2214

__attribute__((nonnull, warn_unused_result))

2215

error_t take_down_interface(const char *const interface){

2216

error_t old_errno = errno;

2217

struct ifreq network;

2218

unsigned int if_index = if_nametoindex(interface);

2219

if(if_index == 0){

2220

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

2221

errno = old_errno;

2222

return ENXIO;

2223

}

2224

if(interface_is_up(interface)){

2225

error_t ret_errno = 0, ioctl_errno = 0;

2226

if(not get_flags(interface, &network) and debug){

2227

ret_errno = errno;

2228

fprintf_plus(stderr, "Failed to get flags for interface "

2229

"\"%s\"\n", interface);

2230

errno = old_errno;

2231

return ret_errno;

2232

}

2233

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

2234

2235

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

2236

if(sd == -1){

2237

ret_errno = errno;

2238

perror_plus("socket");

2239

errno = old_errno;

2240

return ret_errno;

2241

}

2242

2243

if(debug){

2244

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

2245

interface);

2246

}

2247

2248

/* Raise privileges */

2249

ret_errno = raise_privileges();

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("Failed to raise privileges");

2253

}

2254

2255

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2256

ioctl_errno = errno;

2257

2258

/* If raise_privileges() succeeded above */

2259

if(ret_errno == 0){

2260

/* Lower privileges */

2261

ret_errno = lower_privileges();

2262

if(ret_errno != 0){

2263

errno = ret_errno;

2264

perror_plus("Failed to lower privileges");

2265

}

2266

}

2267

2268

/* Close the socket */

2269

int ret = close(sd);

2270

if(ret == -1){

2271

perror_plus("close");

2272

}

2273

2274

if(ret_setflags == -1){

2275

errno = ioctl_errno;

2276

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2277

errno = old_errno;

2278

return ioctl_errno;

2279

}

2280

} else if(debug){

2281

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

2282

interface);

2283

}

2284

2285

errno = old_errno;

2286

return 0;

2287

}

2288

2289

1343

int main(int argc, char *argv[]){

2290

mandos_context mc = { .server = NULL, .dh_bits = 0,

2291

.priority = "SECURE256:!CTYPE-X.509"

2292

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2293

.current_server = NULL, .interfaces = NULL,

2294

.interfaces_size = 0 };

2295

1344

AvahiSServiceBrowser *sb = NULL;

2296

error_t ret_errno;

1345

int error;

2297

1346

int ret;

2298

1347

intmax_t tmpmax;

2299

1348

char *tmp;

2300

1349

int exitcode = EXIT_SUCCESS;

2301

char *interfaces_to_take_down = NULL;

2302

size_t interfaces_to_take_down_size = 0;

2303

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

2304

char old_tempdir[] = "/tmp/mandosXXXXXX";

2305

char *tempdir = NULL;

1350

const char *interface = "";

1351

struct ifreq network;

1352

int sd = -1;

1353

bool take_down_interface = false;

1354

uid_t uid;

1355

gid_t gid;

1356

char tempdir[] = "/tmp/mandosXXXXXX";

1357

bool tempdir_created = false;

2306

1358

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2307

1359

const char *seckey = PATHDIR "/" SECKEY;

2308

1360

const char *pubkey = PATHDIR "/" PUBKEY;

2309

const char *dh_params_file = NULL;

2310

char *interfaces_hooks = NULL;

2311

1361

2312

1362

bool gnutls_initialized = false;

2313

1363

bool gpgme_initialized = false;

2365

1415

.doc = "Bit length of the prime number used in the"

2366

1416

" Diffie-Hellman key exchange",

2367

1417

.group = 2 },

2368

{ .name = "dh-params", .key = 134,

2369

.arg = "FILE",

2370

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2371

" for the Diffie-Hellman key exchange",

2372

.group = 2 },

2373

1418

{ .name = "priority", .key = 130,

2374

1419

.arg = "STRING",

2375

1420

.doc = "GnuTLS priority string for the TLS handshake",

2380

1425

.group = 2 },

2381

1426

{ .name = "retry", .key = 132,

2382

1427

.arg = "SECONDS",

2383

.doc = "Retry interval used when denied by the Mandos server",

2384

.group = 2 },

2385

{ .name = "network-hook-dir", .key = 133,

2386

.arg = "DIR",

2387

.doc = "Directory where network hooks are located",

1428

.doc = "Retry interval used when denied by the mandos server",

2388

1429

.group = 2 },

2389

1430

/*

2390

1431

* These reproduce what we would get without ARGP_NO_HELP

2409

1450

connect_to = arg;

2410

1451

break;

2411

1452

case 'i': /* --interface */

2412

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

2413

arg, (int)',');

2414

if(ret_errno != 0){

2415

argp_error(state, "%s", strerror(ret_errno));

2416

}

1453

interface = arg;

2417

1454

break;

2418

1455

case 's': /* --seckey */

2419

1456

seckey = arg;

2430

1467

}

2431

1468

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

2432

1469

break;

2433

case 134: /* --dh-params */

2434

dh_params_file = arg;

2435

break;

2436

1470

case 130: /* --priority */

2437

1471

mc.priority = arg;

2438

1472

break;

2451

1485

argp_error(state, "Bad retry interval");

2452

1486

}

2453

1487

break;

2454

case 133: /* --network-hook-dir */

2455

hookdir = arg;

2456

break;

2457

1488

/*

2458

1489

* These reproduce what we would get without ARGP_NO_HELP

2459

1490

*/

2465

1496

argp_state_help(state, state->out_stream,

2466

1497

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2467

1498

case 'V': /* --version */

2468

fprintf_plus(state->out_stream, "%s\n", argp_program_version);

1499

fprintf(state->out_stream, "%s\n", argp_program_version);

2469

1500

exit(argp_err_exit_status);

2470

1501

break;

2471

1502

default:

2494

1525

goto end;

2495

1526

}

2496

1527

}

2497

1528

2498

1529

{

2499

1530

/* Work around Debian bug #633582:

2500

1531

<http://bugs.debian.org/633582> */

2501

2502

/* Re-raise privileges */

2503

ret_errno = raise_privileges();

2504

if(ret_errno != 0){

2505

errno = ret_errno;

2506

perror_plus("Failed to raise privileges");

2507

} else {

2508

struct stat st;

2509

2510

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2511

int seckey_fd = open(seckey, O_RDONLY);

2512

if(seckey_fd == -1){

2513

perror_plus("open");

2514

} else {

2515

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

2516

if(ret == -1){

2517

perror_plus("fstat");

2518

} else {

2519

if(S_ISREG(st.st_mode)

2520

and st.st_uid == 0 and st.st_gid == 0){

2521

ret = fchown(seckey_fd, uid, gid);

2522

if(ret == -1){

2523

perror_plus("fchown");

2524

}

2525

}

2526

}

2527

close(seckey_fd);

2528

}

2529

}

2530

2531

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

2532

int pubkey_fd = open(pubkey, O_RDONLY);

2533

if(pubkey_fd == -1){

2534

perror_plus("open");

2535

} else {

2536

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

2537

if(ret == -1){

2538

perror_plus("fstat");

2539

} else {

2540

if(S_ISREG(st.st_mode)

2541

and st.st_uid == 0 and st.st_gid == 0){

2542

ret = fchown(pubkey_fd, uid, gid);

2543

if(ret == -1){

2544

perror_plus("fchown");

2545

}

2546

}

2547

}

2548

close(pubkey_fd);

2549

}

2550

}

2551

2552

if(dh_params_file != NULL

2553

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2554

int dhparams_fd = open(dh_params_file, O_RDONLY);

2555

if(dhparams_fd == -1){

2556

perror_plus("open");

2557

} else {

2558

ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));

2559

if(ret == -1){

2560

perror_plus("fstat");

2561

} else {

2562

if(S_ISREG(st.st_mode)

2563

and st.st_uid == 0 and st.st_gid == 0){

2564

ret = fchown(dhparams_fd, uid, gid);

2565

if(ret == -1){

2566

perror_plus("fchown");

2567

}

2568

}

2569

}

2570

close(dhparams_fd);

2571

}

2572

}

2573

2574

/* Lower privileges */

2575

ret_errno = lower_privileges();

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to lower privileges");

2579

}

2580

}

2581

}

2582

2583

/* Remove invalid interface names (except "none") */

2584

{

2585

char *interface = NULL;

2586

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2587

interface))){

2588

if(strcmp(interface, "none") != 0

2589

and if_nametoindex(interface) == 0){

2590

if(interface[0] != '\0'){

2591

fprintf_plus(stderr, "Not using nonexisting interface"

2592

" \"%s\"\n", interface);

2593

}

2594

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2595

interface = NULL;

2596

}

2597

}

2598

}

2599

2600

/* Run network hooks */

2601

{

2602

if(mc.interfaces != NULL){

2603

interfaces_hooks = malloc(mc.interfaces_size);

2604

if(interfaces_hooks == NULL){

2605

perror_plus("malloc");

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,

1594

alphasort);

1595

int devnull = open("/dev/null", O_RDONLY);

1596

for(int i = 0; i < numhooks; i++){

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

ret = asprintf(&fullname, "%s/%s", tempdir,

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

setenv("DEVICE", interface, 1);

1612

setenv("VERBOSE", debug ? "1" : "0", 1);

1613

setenv("MODE", "start", 1);

1614

/* setenv( XXX more here */

1615

ret = execl(fullname, direntry->d_name, "start", NULL);

1616

perror_plus("execl");

1617

}

1618

free(fullname);

1619

if(quit_now){

2606

1620

goto end;

2607

1621

}

2608

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2609

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2610

1622

}

2611

run_network_hooks("start", interfaces_hooks != NULL ?

2612

interfaces_hooks : "", delay);

1623

close(devnull);

2613

1624

}

2614

1625

2615

1626

if(not debug){

2616

1627

avahi_set_log_function(empty_log);

2617

1628

}

2618

1629

1630

if(interface[0] == '\0'){

1631

struct dirent **direntries;

1632

/* First look for interfaces that are up */

1633

ret = scandir(sys_class_net, &direntries, up_interface,

1634

alphasort);

1635

if(ret == 0){

1636

/* No up interfaces, look for any good interfaces */

1637

free(direntries);

1638

ret = scandir(sys_class_net, &direntries, good_interface,

1639

alphasort);

1640

}

1641

if(ret >= 1){

1642

/* Pick the first interface returned */

1643

interface = strdup(direntries[0]->d_name);

1644

if(debug){

1645

fprintf(stderr, "Using interface \"%s\"\n", interface);

1646

}

1647

if(interface == NULL){

1648

perror_plus("malloc");

1649

free(direntries);

1650

exitcode = EXIT_FAILURE;

1651

goto end;

1652

}

1653

free(direntries);

1654

} else {

1655

free(direntries);

1656

fprintf(stderr, "Could not find a network interface\n");

1657

exitcode = EXIT_FAILURE;

1658

goto end;

1659

}

1660

}

1661

2619

1662

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

2620

1663

from the signal handler */

2621

1664

/* Initialize the pseudo-RNG for Avahi */

2622

1665

srand((unsigned int) time(NULL));

2623

simple_poll = avahi_simple_poll_new();

2624

if(simple_poll == NULL){

2625

fprintf_plus(stderr,

2626

"Avahi: Failed to create simple poll object.\n");

1666

mc.simple_poll = avahi_simple_poll_new();

1667

if(mc.simple_poll == NULL){

1668

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

2627

1669

exitcode = EX_UNAVAILABLE;

2628

1670

goto end;

2629

1671

}

2691

1733

}

2692

1734

}

2693

1735

2694

/* If no interfaces were specified, make a list */

2695

if(mc.interfaces == NULL){

2696

struct dirent **direntries = NULL;

2697

/* Look for any good interfaces */

2698

ret = scandir(sys_class_net, &direntries, good_interface,

2699

alphasort);

2700

if(ret >= 1){

2701

/* Add all found interfaces to interfaces list */

2702

for(int i = 0; i < ret; ++i){

2703

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2704

direntries[i]->d_name);

2705

if(ret_errno != 0){

2706

errno = ret_errno;

2707

perror_plus("argz_add");

2708

free(direntries[i]);

2709

continue;

2710

}

2711

if(debug){

2712

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2713

direntries[i]->d_name);

2714

}

2715

free(direntries[i]);

2716

}

2717

free(direntries);

1736

/* If the interface is down, bring it up */

1737

if(strcmp(interface, "none") != 0){

1738

if_index = (AvahiIfIndex) if_nametoindex(interface);

1739

if(if_index == 0){

1740

fprintf(stderr, "No such interface: \"%s\"\n", interface);

1741

exitcode = EX_UNAVAILABLE;

1742

goto end;

1743

}

1744

1745

if(quit_now){

1746

goto end;

1747

}

1748

1749

/* Re-raise priviliges */

1750

errno = 0;

1751

ret = seteuid(0);

1752

if(ret == -1){

1753

perror_plus("seteuid");

1754

}

1755

1756

#ifdef __linux__

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

messages about the network interface to mess up the prompt */

1759

ret = klogctl(8, NULL, 5);

1760

bool restore_loglevel = true;

1761

if(ret == -1){

1762

restore_loglevel = false;

1763

perror_plus("klogctl");

1764

}

1765

#endif /* __linux__ */

1766

1767

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1768

if(sd < 0){

1769

perror_plus("socket");

1770

exitcode = EX_OSERR;

1771

#ifdef __linux__

1772

if(restore_loglevel){

1773

ret = klogctl(7, NULL, 0);

1774

if(ret == -1){

1775

perror_plus("klogctl");

1776

}

1777

}

1778

#endif /* __linux__ */

1779

/* Lower privileges */

1780

errno = 0;

1781

ret = seteuid(uid);

1782

if(ret == -1){

1783

perror_plus("seteuid");

1784

}

1785

goto end;

1786

}

1787

strcpy(network.ifr_name, interface);

1788

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1789

if(ret == -1){

1790

perror_plus("ioctl SIOCGIFFLAGS");

1791

#ifdef __linux__

1792

if(restore_loglevel){

1793

ret = klogctl(7, NULL, 0);

1794

if(ret == -1){

1795

perror_plus("klogctl");

1796

}

1797

}

1798

#endif /* __linux__ */

1799

exitcode = EX_OSERR;

1800

/* Lower privileges */

1801

errno = 0;

1802

ret = seteuid(uid);

1803

if(ret == -1){

1804

perror_plus("seteuid");

1805

}

1806

goto end;

1807

}

1808

if((network.ifr_flags & IFF_UP) == 0){

1809

network.ifr_flags |= IFF_UP;

1810

take_down_interface = true;

1811

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1812

if(ret == -1){

1813

take_down_interface = false;

1814

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1815

exitcode = EX_OSERR;

1816

#ifdef __linux__

1817

if(restore_loglevel){

1818

ret = klogctl(7, NULL, 0);

1819

if(ret == -1){

1820

perror_plus("klogctl");

1821

}

1822

}

1823

#endif /* __linux__ */

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1830

goto end;

1831

}

1832

}

1833

/* Sleep checking until interface is running.

1834

Check every 0.25s, up to total time of delay */

1835

for(int i=0; i < delay * 4; i++){

1836

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1837

if(ret == -1){

1838

perror_plus("ioctl SIOCGIFFLAGS");

1839

} else if(network.ifr_flags & IFF_RUNNING){

1840

break;

1841

}

1842

struct timespec sleeptime = { .tv_nsec = 250000000 };

1843

ret = nanosleep(&sleeptime, NULL);

1844

if(ret == -1 and errno != EINTR){

1845

perror_plus("nanosleep");

1846

}

1847

}

1848

if(not take_down_interface){

1849

/* We won't need the socket anymore */

1850

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1851

if(ret == -1){

1852

perror_plus("close");

1853

}

1854

}

1855

#ifdef __linux__

1856

if(restore_loglevel){

1857

/* Restores kernel loglevel to default */

1858

ret = klogctl(7, NULL, 0);

1859

if(ret == -1){

1860

perror_plus("klogctl");

1861

}

1862

}

1863

#endif /* __linux__ */

1864

/* Lower privileges */

1865

errno = 0;

1866

if(take_down_interface){

1867

/* Lower privileges */

1868

ret = seteuid(uid);

1869

if(ret == -1){

1870

perror_plus("seteuid");

1871

}

2718

1872

} else {

2719

if(ret == 0){

2720

free(direntries);

2721

}

2722

fprintf_plus(stderr, "Could not find a network interface\n");

2723

exitcode = EXIT_FAILURE;

2724

goto end;

2725

}

2726

}

2727

2728

/* Bring up interfaces which are down, and remove any "none"s */

2729

{

2730

char *interface = NULL;

2731

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2732

interface))){

2733

/* If interface name is "none", stop bringing up interfaces.

2734

Also remove all instances of "none" from the list */

2735

if(strcmp(interface, "none") == 0){

2736

argz_delete(&mc.interfaces, &mc.interfaces_size,

2737

interface);

2738

interface = NULL;

2739

while((interface = argz_next(mc.interfaces,

2740

mc.interfaces_size, interface))){

2741

if(strcmp(interface, "none") == 0){

2742

argz_delete(&mc.interfaces, &mc.interfaces_size,

2743

interface);

2744

interface = NULL;

2745

}

2746

}

2747

break;

2748

}

2749

bool interface_was_up = interface_is_up(interface);

2750

errno = bring_up_interface(interface, delay);

2751

if(not interface_was_up){

2752

if(errno != 0){

2753

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2754

" %s\n", interface, strerror(errno));

2755

} else {

2756

errno = argz_add(&interfaces_to_take_down,

2757

&interfaces_to_take_down_size,

2758

interface);

2759

if(errno != 0){

2760

perror_plus("argz_add");

2761

}

2762

}

2763

}

2764

}

2765

if(debug and (interfaces_to_take_down == NULL)){

2766

fprintf_plus(stderr, "No interfaces were brought up\n");

2767

}

2768

}

2769

2770

/* If we only got one interface, explicitly use only that one */

2771

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2772

if(debug){

2773

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2774

mc.interfaces);

2775

}

2776

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

1873

/* Lower privileges permanently */

1874

ret = setuid(uid);

1875

if(ret == -1){

1876

perror_plus("setuid");

1877

}

1878

}

2777

1879

}

2778

1880

2779

1881

if(quit_now){

2780

1882

goto end;

2781

1883

}

2782

1884

2783

ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);

1885

ret = init_gnutls_global(pubkey, seckey);

2784

1886

if(ret == -1){

2785

fprintf_plus(stderr, "init_gnutls_global failed\n");

1887

fprintf(stderr, "init_gnutls_global failed\n");

2786

1888

exitcode = EX_UNAVAILABLE;

2787

1889

goto end;

2788

1890

} else {

2793

1895

goto end;

2794

1896

}

2795

1897

2796

/* Try /run/tmp before /tmp */

2797

tempdir = mkdtemp(run_tempdir);

2798

if(tempdir == NULL and errno == ENOENT){

2799

if(debug){

2800

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2801

run_tempdir, old_tempdir);

2802

}

2803

tempdir = mkdtemp(old_tempdir);

2804

}

2805

if(tempdir == NULL){

1898

if(mkdtemp(tempdir) == NULL){

2806

1899

perror_plus("mkdtemp");

2807

1900

goto end;

2808

1901

}

1902

tempdir_created = true;

2809

1903

2810

1904

if(quit_now){

2811

1905

goto end;

2812

1906

}

2813

1907

2814

if(not init_gpgme(pubkey, seckey, tempdir, &mc)){

2815

fprintf_plus(stderr, "init_gpgme failed\n");

1908

if(not init_gpgme(pubkey, seckey, tempdir)){

1909

fprintf(stderr, "init_gpgme failed\n");

2816

1910

exitcode = EX_UNAVAILABLE;

2817

1911

goto end;

2818

1912

} else {

2827

1921

/* Connect directly, do not use Zeroconf */

2828

1922

/* (Mainly meant for debugging) */

2829

1923

char *address = strrchr(connect_to, ':');

2830

2831

1924

if(address == NULL){

2832

fprintf_plus(stderr, "No colon in address\n");

1925

fprintf(stderr, "No colon in address\n");

2833

1926

exitcode = EX_USAGE;

2834

1927

goto end;

2835

1928

}

2838

1931

goto end;

2839

1932

}

2840

1933

2841

in_port_t port;

1934

uint16_t port;

2842

1935

errno = 0;

2843

1936

tmpmax = strtoimax(address+1, &tmp, 10);

2844

1937

if(errno != 0 or tmp == address+1 or *tmp != '\0'

2845

or tmpmax != (in_port_t)tmpmax){

2846

fprintf_plus(stderr, "Bad port number\n");

1938

or tmpmax != (uint16_t)tmpmax){

1939

fprintf(stderr, "Bad port number\n");

2847

1940

exitcode = EX_USAGE;

2848

1941

goto end;

2849

1942

}

2850

1943

2851

1944

if(quit_now){

2852

1945

goto end;

2853

1946

}

2854

1947

2855

port = (in_port_t)tmpmax;

1948

port = (uint16_t)tmpmax;

2856

1949

*address = '\0';

2857

1950

/* Colon in address indicates IPv6 */

2858

1951

int af;

2874

1967

}

2875

1968

2876

1969

while(not quit_now){

2877

ret = start_mandos_communication(address, port, if_index, af,

2878

&mc);

1970

ret = start_mandos_communication(address, port, if_index, af);

2879

1971

if(quit_now or ret == 0){

2880

1972

break;

2881

1973

}

2882

1974

if(debug){

2883

fprintf_plus(stderr, "Retrying in %d seconds\n",

2884

(int)retry_interval);

1975

fprintf(stderr, "Retrying in %d seconds\n",

1976

(int)retry_interval);

2885

1977

}

2886

sleep((unsigned int)retry_interval);

1978

sleep((int)retry_interval);

2887

1979

}

2888

1980

2889

if(not quit_now){

1981

if (not quit_now){

2890

1982

exitcode = EXIT_SUCCESS;

2891

1983

}

2892

1984

2907

1999

config.publish_domain = 0;

2908

2000

2909

2001

/* Allocate a new server */

2910

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2911

&config, NULL, NULL, &ret_errno);

2002

mc.server = avahi_server_new(avahi_simple_poll_get

2003

(mc.simple_poll), &config, NULL,

2004

NULL, &error);

2912

2005

2913

2006

/* Free the Avahi configuration data */

2914

2007

avahi_server_config_free(&config);

2916

2009

2917

2010

/* Check if creating the Avahi server object succeeded */

2918

2011

if(mc.server == NULL){

2919

fprintf_plus(stderr, "Failed to create Avahi server: %s\n",

2920

avahi_strerror(ret_errno));

2012

fprintf(stderr, "Failed to create Avahi server: %s\n",

2013

avahi_strerror(error));

2921

2014

exitcode = EX_UNAVAILABLE;

2922

2015

goto end;

2923

2016

}

2929

2022

/* Create the Avahi service browser */

2930

2023

sb = avahi_s_service_browser_new(mc.server, if_index,

2931

2024

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2932

NULL, 0, browse_callback,

2933

(void *)&mc);

2025

NULL, 0, browse_callback, NULL);

2934

2026

if(sb == NULL){

2935

fprintf_plus(stderr, "Failed to create service browser: %s\n",

2936

avahi_strerror(avahi_server_errno(mc.server)));

2027

fprintf(stderr, "Failed to create service browser: %s\n",

2028

avahi_strerror(avahi_server_errno(mc.server)));

2937

2029

exitcode = EX_UNAVAILABLE;

2938

2030

goto end;

2939

2031

}

2945

2037

/* Run the main loop */

2946

2038

2947

2039

if(debug){

2948

fprintf_plus(stderr, "Starting Avahi loop search\n");

2040

fprintf(stderr, "Starting Avahi loop search\n");

2949

2041

}

2950

2951

ret = avahi_loop_with_timeout(simple_poll,

2952

(int)(retry_interval * 1000), &mc);

2042

2043

ret = avahi_loop_with_timeout(mc.simple_poll,

2044

(int)(retry_interval * 1000));

2953

2045

if(debug){

2954

fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",

2955

(ret == 0) ? "successfully" : "with error");

2046

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

2047

(ret == 0) ? "successfully" : "with error");

2956

2048

}

2957

2049

2958

2050

end:

2959

2051

2960

2052

if(debug){

2961

fprintf_plus(stderr, "%s exiting\n", argv[0]);

2053

fprintf(stderr, "%s exiting\n", argv[0]);

2962

2054

}

2963

2055

2964

2056

/* Cleanup things */

2965

free(mc.interfaces);

2966

2967

2057

if(sb != NULL)

2968

2058

avahi_s_service_browser_free(sb);

2969

2059

2970

2060

if(mc.server != NULL)

2971

2061

avahi_server_free(mc.server);

2972

2062

2973

if(simple_poll != NULL)

2974

avahi_simple_poll_free(simple_poll);

2063

if(mc.simple_poll != NULL)

2064

avahi_simple_poll_free(mc.simple_poll);

2975

2065

2976

2066

if(gnutls_initialized){

2977

2067

gnutls_certificate_free_credentials(mc.cred);

2982

2072

if(gpgme_initialized){

2983

2073

gpgme_release(mc.ctx);

2984

2074

}

2985

2075

2986

2076

/* Cleans up the circular linked list of Mandos servers the client

2987

2077

has seen */

2988

2078

if(mc.current_server != NULL){

2989

2079

mc.current_server->prev->next = NULL;

2990

2080

while(mc.current_server != NULL){

2991

2081

server *next = mc.current_server->next;

2992

#ifdef __GNUC__

2993

#pragma GCC diagnostic push

2994

#pragma GCC diagnostic ignored "-Wcast-qual"

2995

#endif

2996

free((char *)(mc.current_server->ip));

2997

#ifdef __GNUC__

2998

#pragma GCC diagnostic pop

2999

#endif

3000

2082

free(mc.current_server);

3001

2083

mc.current_server = next;

3002

2084

}

3003

2085

}

3004

2086

3005

/* Re-raise privileges */

3006

{

3007

ret_errno = raise_privileges();

3008

if(ret_errno != 0){

3009

errno = ret_errno;

3010

perror_plus("Failed to raise privileges");

3011

} else {

3012

3013

/* Run network hooks */

3014

run_network_hooks("stop", interfaces_hooks != NULL ?

3015

interfaces_hooks : "", delay);

3016

3017

/* Take down the network interfaces which were brought up */

3018

{

3019

char *interface = NULL;

3020

while((interface=argz_next(interfaces_to_take_down,

3021

interfaces_to_take_down_size,

3022

interface))){

3023

ret_errno = take_down_interface(interface);

3024

if(ret_errno != 0){

3025

errno = ret_errno;

3026

perror_plus("Failed to take down interface");

3027

}

3028

}

3029

if(debug and (interfaces_to_take_down == NULL)){

3030

fprintf_plus(stderr, "No interfaces needed to be taken"

3031

" down\n");

3032

}

3033

}

2087

/* XXX run network hooks "stop" here */

2088

2089

/* Take down the network interface */

2090

if(take_down_interface){

2091

/* Re-raise priviliges */

2092

errno = 0;

2093

ret = seteuid(0);

2094

if(ret == -1){

2095

perror_plus("seteuid");

3034

2096

}

3035

3036

ret_errno = lower_privileges_permanently();

3037

if(ret_errno != 0){

3038

errno = ret_errno;

3039

perror_plus("Failed to lower privileges permanently");

2097

if(geteuid() == 0){

2098

ret = ioctl(sd, SIOCGIFFLAGS, &network);

2099

if(ret == -1){

2100

perror_plus("ioctl SIOCGIFFLAGS");

2101

} else if(network.ifr_flags & IFF_UP) {

2102

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

2103

ret = ioctl(sd, SIOCSIFFLAGS, &network);

2104

if(ret == -1){

2105

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2106

}

2107

}

2108

ret = (int)TEMP_FAILURE_RETRY(close(sd));

2109

if(ret == -1){

2110

perror_plus("close");

2111

}

2112

/* Lower privileges permanently */

2113

errno = 0;

2114

ret = setuid(uid);

2115

if(ret == -1){

2116

perror_plus("setuid");

2117

}

3040

2118

}

3041

2119

}

3042

2120

3043

free(interfaces_to_take_down);

3044

free(interfaces_hooks);

3045

3046

2121

/* Removes the GPGME temp directory and all files inside */

3047

if(tempdir != NULL){

2122

if(tempdir_created){

3048

2123

struct dirent **direntries = NULL;

3049

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY

3050

| O_NOFOLLOW

3051

| O_DIRECTORY

3052

| O_PATH));

3053

if(tempdir_fd == -1){

3054

perror_plus("open");

3055

} else {

3056

#ifdef __GLIBC__

3057

#if __GLIBC_PREREQ(2, 15)

3058

int numentries = scandirat(tempdir_fd, ".", &direntries,

3059

notdotentries, alphasort);

3060

#else /* not __GLIBC_PREREQ(2, 15) */

3061

int numentries = scandir(tempdir, &direntries, notdotentries,

3062

alphasort);

3063

#endif /* not __GLIBC_PREREQ(2, 15) */

3064

#else /* not __GLIBC__ */

3065

int numentries = scandir(tempdir, &direntries, notdotentries,

3066

alphasort);

3067

#endif /* not __GLIBC__ */

3068

if(numentries >= 0){

3069

for(int i = 0; i < numentries; i++){

3070

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

3071

if(ret == -1){

3072

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

3073

" \"%s\", 0): %s\n", tempdir,

3074

direntries[i]->d_name, strerror(errno));

3075

}

3076

free(direntries[i]);

3077

}

3078

3079

/* need to clean even if 0 because man page doesn't specify */

3080

free(direntries);

3081

if(numentries == -1){

3082

perror_plus("scandir");

3083

}

3084

ret = rmdir(tempdir);

3085

if(ret == -1 and errno != ENOENT){

3086

perror_plus("rmdir");

3087

}

2124

struct dirent *direntry = NULL;

2125

int numentries = scandir(tempdir, &direntries, notdotentries,

2126

alphasort);

2127

if (numentries > 0){

2128

for(int i = 0; i < numentries; i++){

2129

direntry = direntries[i];

2130

char *fullname = NULL;

2131

ret = asprintf(&fullname, "%s/%s", tempdir,

2132

direntry->d_name);

2133

if(ret < 0){

2134

perror_plus("asprintf");

2135

continue;

2136

}

2137

ret = remove(fullname);

2138

if(ret == -1){

2139

fprintf(stderr, "remove(\"%s\"): %s\n", fullname,

2140

strerror(errno));

2141

}

2142

free(fullname);

3088

2143

}

3089

close(tempdir_fd);

2144

}

2145

2146

/* need to clean even if 0 because man page doesn't specify */

2147

free(direntries);

2148

if (numentries == -1){

2149

perror_plus("scandir");

2150

}

2151

ret = rmdir(tempdir);

2152

if(ret == -1 and errno != ENOENT){

2153

perror_plus("rmdir");

3090

2154

}

3091

2155

}

3092

2156