/mandos/trunk : revision 742

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

10

*

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* Everything else is

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12

13

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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

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#endif /* not _LARGEFILE_SOURCE */

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#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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

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

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stdout, ferror(), remove() */

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

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stdout, ferror() */

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#include <stdint.h> /* uint16_t, uint32_t, intptr_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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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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#include <fcntl.h> /* open() */

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

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62

*/

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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() */

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

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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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#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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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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100

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

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142

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

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143

char *connect_to = NULL;

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144

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

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typedef struct server{

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151

const char *ip;

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uint16_t port;

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in_port_t port;

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AvahiIfIndex if_index;

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int af;

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struct timespec last_seen;

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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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162

AvahiServer *server;

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gnutls_certificate_credentials_t cred;

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164

unsigned int dh_bits;

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166

const char *priority;

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gpgme_ctx_t ctx;

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168

server *current_server;

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char *interfaces;

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size_t interfaces_size;

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171

} mandos_context;

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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 };

173

/* global so signal handler can reach it*/

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AvahiSimplePoll *simple_poll;

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175

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sig_atomic_t quit_now = 0;

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int signal_received = 0;

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/* Function to use when printing errors */

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void perror_plus(const char *print_text){

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int e = errno;

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

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183

program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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189

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

178

190

va_list ap;

179

191

va_start (ap, format);

180

192

181

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

182

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

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));

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196

}

184

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/*

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200

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

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* "buffer_length" is how much is already used.

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202

*/

203

__attribute__((nonnull, warn_unused_result))

190

204

size_t incbuffer(char **buffer, size_t buffer_length,

191

205

size_t buffer_capacity){

192

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

193

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

194

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

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int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

195

213

return 0;

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214

}

215

*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

198

217

}

199

218

return buffer_capacity;

200

219

}

201

220

202

221

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

203

int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

204

int af){

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){

205

225

int ret;

206

226

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

207

227

if(new_server == NULL){

208

228

perror_plus("malloc");

209

return -1;

229

return false;

210

230

}

211

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

212

232

.port = port,

214

234

.af = af };

215

235

if(new_server->ip == NULL){

216

236

perror_plus("strdup");

217

return -1;

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

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#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;

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253

}

219

254

/* Special case of first server */

220

if (mc.current_server == NULL){

255

if(*current_server == NULL){

221

256

new_server->next = new_server;

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257

new_server->prev = new_server;

223

mc.current_server = new_server;

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

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*current_server = new_server;

225

259

} else {

226

new_server->next = mc.current_server;

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

260

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

261

new_server->next = *current_server;

262

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

228

263

new_server->prev->next = new_server;

229

mc.current_server->prev = new_server;

230

}

231

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

232

if(ret == -1){

233

perror_plus("clock_gettime");

234

return -1;

235

}

236

return 0;

264

(*current_server)->prev = new_server;

265

}

266

return true;

237

267

}

238

268

239

269

/*

240

270

* Initialize GPGME.

241

271

*/

242

static bool init_gpgme(const char *seckey, const char *pubkey,

243

const char *tempdir){

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

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const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

244

277

gpgme_error_t rc;

245

278

gpgme_engine_info_t engine_info;

246

279

247

248

280

/*

249

281

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

250

282

*/

251

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

252

284

int ret;

253

285

int fd;

254

286

gpgme_data_t pgp_data;

262

294

rc = gpgme_data_new_from_fd(&pgp_data, fd);

263

295

if(rc != GPG_ERR_NO_ERROR){

264

296

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

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gpgme_strsource(rc), gpgme_strerror(rc));

297

gpgme_strsource(rc), gpgme_strerror(rc));

266

298

return false;

267

299

}

268

300

269

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

270

302

if(rc != GPG_ERR_NO_ERROR){

271

303

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

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gpgme_strsource(rc), gpgme_strerror(rc));

304

gpgme_strsource(rc), gpgme_strerror(rc));

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305

return false;

274

306

}

275

307

290

322

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

291

323

if(rc != GPG_ERR_NO_ERROR){

292

324

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

293

gpgme_strsource(rc), gpgme_strerror(rc));

325

gpgme_strsource(rc), gpgme_strerror(rc));

294

326

return false;

295

327

}

296

328

298

330

rc = gpgme_get_engine_info(&engine_info);

299

331

if(rc != GPG_ERR_NO_ERROR){

300

332

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

301

gpgme_strsource(rc), gpgme_strerror(rc));

333

gpgme_strsource(rc), gpgme_strerror(rc));

302

334

return false;

303

335

}

304

336

while(engine_info != NULL){

310

342

engine_info = engine_info->next;

311

343

}

312

344

if(engine_info == NULL){

313

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

345

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

346

tempdir);

314

347

return false;

315

348

}

316

349

317

350

/* Create new GPGME "context" */

318

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

351

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

319

352

if(rc != GPG_ERR_NO_ERROR){

320

353

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

321

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

322

gpgme_strerror(rc));

354

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

355

gpgme_strerror(rc));

323

356

return false;

324

357

}

325

358

334

367

* Decrypt OpenPGP data.

335

368

* Returns -1 on error

336

369

*/

370

__attribute__((nonnull, warn_unused_result))

337

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

338

372

size_t crypto_size,

339

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

340

375

gpgme_data_t dh_crypto, dh_plain;

341

376

gpgme_error_t rc;

342

377

ssize_t ret;

352

387

0);

353

388

if(rc != GPG_ERR_NO_ERROR){

354

389

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

355

gpgme_strsource(rc), gpgme_strerror(rc));

390

gpgme_strsource(rc), gpgme_strerror(rc));

356

391

return -1;

357

392

}

358

393

360

395

rc = gpgme_data_new(&dh_plain);

361

396

if(rc != GPG_ERR_NO_ERROR){

362

397

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

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

398

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

399

gpgme_strsource(rc), gpgme_strerror(rc));

365

400

gpgme_data_release(dh_crypto);

366

401

return -1;

367

402

}

368

403

369

404

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

370

405

data buffer */

371

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

406

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

372

407

if(rc != GPG_ERR_NO_ERROR){

373

408

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

374

gpgme_strsource(rc), gpgme_strerror(rc));

409

gpgme_strsource(rc), gpgme_strerror(rc));

375

410

plaintext_length = -1;

376

411

if(debug){

377

412

gpgme_decrypt_result_t result;

378

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

379

414

if(result == NULL){

380

415

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

381

416

} else {

382

417

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

383

result->unsupported_algorithm);

418

result->unsupported_algorithm);

384

419

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

385

result->wrong_key_usage);

420

result->wrong_key_usage);

386

421

if(result->file_name != NULL){

387

422

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

388

423

}

390

425

recipient = result->recipients;

391

426

while(recipient != NULL){

392

427

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

393

gpgme_pubkey_algo_name(recipient->pubkey_algo));

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

394

430

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

395

431

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

396

recipient->status == GPG_ERR_NO_SECKEY

397

? "No" : "Yes");

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

398

434

recipient = recipient->next;

399

435

}

400

436

}

457

493

return plaintext_length;

458

494

}

459

495

460

static const char * safer_gnutls_strerror(int value){

461

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

462

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

463

499

if(ret == NULL)

464

500

ret = "(unknown)";

465

501

return ret;

466

502

}

467

503

468

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

469

506

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

470

507

const char* string){

471

508

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

472

509

}

473

510

511

__attribute__((nonnull, warn_unused_result))

474

512

static int init_gnutls_global(const char *pubkeyfilename,

475

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

476

515

int ret;

477

516

478

517

if(debug){

481

520

482

521

ret = gnutls_global_init();

483

522

if(ret != GNUTLS_E_SUCCESS){

484

fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

523

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

524

safer_gnutls_strerror(ret));

485

525

return -1;

486

526

}

487

527

494

534

}

495

535

496

536

/* OpenPGP credentials */

497

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

498

538

if(ret != GNUTLS_E_SUCCESS){

499

fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

500

541

gnutls_global_deinit();

501

542

return -1;

502

543

}

503

544

504

545

if(debug){

505

546

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

506

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

507

seckeyfilename);

547

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

548

pubkeyfilename,

549

seckeyfilename);

508

550

}

509

551

510

552

ret = gnutls_certificate_set_openpgp_key_file

511

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

512

554

GNUTLS_OPENPGP_FMT_BASE64);

513

555

if(ret != GNUTLS_E_SUCCESS){

514

556

fprintf_plus(stderr,

515

557

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

516

558

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

517

fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

559

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

560

safer_gnutls_strerror(ret));

518

561

goto globalfail;

519

562

}

520

563

521

564

/* GnuTLS server initialization */

522

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

523

566

if(ret != GNUTLS_E_SUCCESS){

524

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

525

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

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

568

" initialization: %s\n",

569

safer_gnutls_strerror(ret));

526

570

goto globalfail;

527

571

}

528

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

572

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

529

573

if(ret != GNUTLS_E_SUCCESS){

530

574

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

531

safer_gnutls_strerror(ret));

575

safer_gnutls_strerror(ret));

532

576

goto globalfail;

533

577

}

534

578

535

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

536

580

537

581

return 0;

538

582

539

583

globalfail:

540

584

541

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

542

586

gnutls_global_deinit();

543

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

544

588

return -1;

545

589

}

546

590

547

static int init_gnutls_session(gnutls_session_t *session){

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

548

594

int ret;

549

595

/* GnuTLS session creation */

550

596

do {

554

600

}

555

601

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

556

602

if(ret != GNUTLS_E_SUCCESS){

557

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

558

safer_gnutls_strerror(ret));

603

fprintf_plus(stderr,

604

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

605

safer_gnutls_strerror(ret));

559

606

}

560

607

561

608

{

562

609

const char *err;

563

610

do {

564

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

611

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

565

612

if(quit_now){

566

613

gnutls_deinit(*session);

567

614

return -1;

569

616

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

570

617

if(ret != GNUTLS_E_SUCCESS){

571

618

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

572

fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));

619

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

620

safer_gnutls_strerror(ret));

573

621

gnutls_deinit(*session);

574

622

return -1;

575

623

}

577

625

578

626

do {

579

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

580

mc.cred);

628

mc->cred);

581

629

if(quit_now){

582

630

gnutls_deinit(*session);

583

631

return -1;

585

633

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

586

634

if(ret != GNUTLS_E_SUCCESS){

587

635

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

588

safer_gnutls_strerror(ret));

636

safer_gnutls_strerror(ret));

589

637

gnutls_deinit(*session);

590

638

return -1;

591

639

}

593

641

/* ignore client certificate if any. */

594

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

595

643

596

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

597

645

598

646

return 0;

599

647

}

603

651

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

604

652

605

653

/* Called when a Mandos server is found */

606

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

654

__attribute__((nonnull, warn_unused_result))

655

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

607

656

AvahiIfIndex if_index,

608

int af){

657

int af, mandos_context *mc){

609

658

int ret, tcp_sd = -1;

610

659

ssize_t sret;

611

union {

612

struct sockaddr_in in;

613

struct sockaddr_in6 in6;

614

} to;

660

struct sockaddr_storage to;

615

661

char *buffer = NULL;

616

662

char *decrypted_buffer = NULL;

617

663

size_t buffer_length = 0;

641

687

return -1;

642

688

}

643

689

644

ret = init_gnutls_session(&session);

690

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

691

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

692

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

693

bool match = false;

694

{

695

char *interface = NULL;

696

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

697

interface))){

698

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

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

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

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

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

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

645

723

if(ret != 0){

646

724

return -1;

647

725

}

648

726

649

727

if(debug){

650

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

651

"\n", ip, port);

728

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

729

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

652

730

}

653

731

654

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

666

744

667

745

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

668

746

if(af == AF_INET6){

669

to.in6.sin6_family = (sa_family_t)af;

670

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

747

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

748

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

671

749

} else { /* IPv4 */

672

to.in.sin_family = (sa_family_t)af;

673

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

750

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

751

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

674

752

}

675

753

if(ret < 0 ){

676

754

int e = errno;

685

763

goto mandos_end;

686

764

}

687

765

if(af == AF_INET6){

688

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

689

-Wconversion and

690

-Wunreachable-code */

691

692

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

693

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

694

-Wunreachable-code*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

695

769

if(if_index == AVAHI_IF_UNSPEC){

696

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

697

" without a network interface\n");

770

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

771

" incomplete without a network interface\n");

698

772

errno = EINVAL;

699

773

goto mandos_end;

700

774

}

701

775

/* Set the network interface number as scope */

702

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

703

777

}

704

778

} else {

705

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

706

-Wconversion and

707

-Wunreachable-code */

779

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

708

780

}

709

781

710

782

if(quit_now){

718

790

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

719

791

perror_plus("if_indextoname");

720

792

} else {

721

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

722

ip, interface, port);

793

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

794

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

723

795

}

724

796

} else {

725

fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);

797

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

798

ip, (uintmax_t)port);

726

799

}

727

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

728

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

729

const char *pcret;

730

802

if(af == AF_INET6){

731

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

732

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

733

807

} else {

734

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

735

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

736

812

}

737

if(pcret == NULL){

738

perror_plus("inet_ntop");

739

} else {

740

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

741

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

742

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

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

817

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

818

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

743

819

}

744

820

}

745

821

749

825

}

750

826

751

827

if(af == AF_INET6){

752

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

828

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

829

sizeof(struct sockaddr_in6));

753

830

} else {

754

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

831

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

832

sizeof(struct sockaddr_in));

755

833

}

756

834

if(ret < 0){

757

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

835

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

758

836

int e = errno;

759

837

perror_plus("connect");

760

838

errno = e;

806

884

goto mandos_end;

807

885

}

808

886

809

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

810

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

887

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

888

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

889

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

890

gnutls_transport_set_ptr(session,

891

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

811

892

812

893

if(quit_now){

813

894

errno = EINTR;

834

915

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

835

916

836

917

if(debug){

837

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);

918

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

919

" %s\n", ip);

838

920

}

839

921

840

922

while(true){

878

960

}

879

961

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

880

962

if(ret < 0){

881

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

963

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

964

"***\n");

882

965

gnutls_perror(ret);

883

966

errno = EPROTO;

884

967

goto mandos_end;

886

969

break;

887

970

default:

888

971

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

889

" encrypted session with Mandos server\n");

972

" encrypted session with Mandos server\n");

890

973

gnutls_bye(session, GNUTLS_SHUT_RDWR);

891

974

errno = EIO;

892

975

goto mandos_end;

916

999

if(buffer_length > 0){

917

1000

ssize_t decrypted_buffer_size;

918

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

919

&decrypted_buffer);

1002

&decrypted_buffer, mc);

920

1003

if(decrypted_buffer_size >= 0){

921

1004

922

1005

written = 0;

933

1016

int e = errno;

934

1017

if(debug){

935

1018

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

936

strerror(errno));

1019

strerror(errno));

937

1020

}

938

1021

errno = e;

939

1022

goto mandos_end;

970

1053

return retval;

971

1054

}

972

1055

1056

__attribute__((nonnull))

973

1057

static void resolve_callback(AvahiSServiceResolver *r,

974

1058

AvahiIfIndex interface,

975

1059

AvahiProtocol proto,

983

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

984

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

985

1069

flags,

986

AVAHI_GCC_UNUSED void* userdata){

987

assert(r);

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

988

1074

989

1075

/* Called whenever a service has been resolved successfully or

990

1076

timed out */

991

1077

992

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

993

1080

return;

994

1081

}

995

1082

996

1083

switch(event){

997

1084

default:

998

1085

case AVAHI_RESOLVER_FAILURE:

999

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

1000

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

1001

avahi_strerror(avahi_server_errno(mc.server)));

1086

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

1087

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

1088

domain,

1089

avahi_strerror(avahi_server_errno

1090

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

1002

1091

break;

1003

1092

1004

1093

case AVAHI_RESOLVER_FOUND:

1007

1096

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

1008

1097

if(debug){

1009

1098

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

1010

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

1011

ip, (intmax_t)interface, port);

1099

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

1100

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

1012

1101

}

1013

int ret = start_mandos_communication(ip, port, interface,

1014

avahi_proto_to_af(proto));

1102

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

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

1015

1106

if(ret == 0){

1016

avahi_simple_poll_quit(mc.simple_poll);

1107

avahi_simple_poll_quit(simple_poll);

1017

1108

} else {

1018

ret = add_server(ip, port, interface,

1019

avahi_proto_to_af(proto));

1109

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

1110

avahi_proto_to_af(proto),

1111

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

1112

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

1113

" list\n", name);

1114

}

1020

1115

}

1021

1116

}

1022

1117

}

1032

1127

const char *domain,

1033

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1034

1129

flags,

1035

AVAHI_GCC_UNUSED void* userdata){

1036

assert(b);

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

1037

1134

1038

1135

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

1039

1136

is removed from the LAN */

1047

1144

case AVAHI_BROWSER_FAILURE:

1048

1145

1049

1146

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

1050

avahi_strerror(avahi_server_errno(mc.server)));

1051

avahi_simple_poll_quit(mc.simple_poll);

1147

avahi_strerror(avahi_server_errno

1148

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

1149

avahi_simple_poll_quit(simple_poll);

1052

1150

return;

1053

1151

1054

1152

case AVAHI_BROWSER_NEW:

1057

1155

the callback function is called the Avahi server will free the

1058

1156

resolver for us. */

1059

1157

1060

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

1061

name, type, domain, protocol, 0,

1062

resolve_callback, NULL) == NULL)

1063

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

1064

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

1158

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

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1162

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

1163

" %s\n", name,

1164

avahi_strerror(avahi_server_errno

1165

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

1065

1166

break;

1066

1167

1067

1168

case AVAHI_BROWSER_REMOVE:

1070

1171

case AVAHI_BROWSER_ALL_FOR_NOW:

1071

1172

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1072

1173

if(debug){

1073

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

1174

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

1175

" searching...\n");

1074

1176

}

1075

1177

break;

1076

1178

}

1085

1187

signal_received = sig;

1086

1188

int old_errno = errno;

1087

1189

/* set main loop to exit */

1088

if(mc.simple_poll != NULL){

1089

avahi_simple_poll_quit(mc.simple_poll);

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1090

1192

}

1091

1193

errno = old_errno;

1092

1194

}

1093

1195

1196

__attribute__((nonnull, warn_unused_result))

1094

1197

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

1095

1198

int ret;

1199

error_t ret_errno;

1096

1200

1097

1201

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

1098

1202

if(s < 0){

1203

ret_errno = errno;

1099

1204

perror_plus("socket");

1205

errno = ret_errno;

1100

1206

return false;

1101

1207

}

1102

1208

strcpy(ifr->ifr_name, ifname);

1103

1209

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1104

1210

if(ret == -1){

1105

1211

if(debug){

1212

ret_errno = errno;

1106

1213

perror_plus("ioctl SIOCGIFFLAGS");

1214

errno = ret_errno;

1107

1215

}

1108

1216

return false;

1109

1217

}

1110

1218

return true;

1111

1219

}

1112

1220

1221

__attribute__((nonnull, warn_unused_result))

1113

1222

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

1114

1223

1115

1224

/* Reject the loopback device */

1116

1225

if(ifr->ifr_flags & IFF_LOOPBACK){

1117

1226

if(debug){

1118

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

1227

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

1228

ifname);

1119

1229

}

1120

1230

return false;

1121

1231

}

1122

1232

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

1123

1233

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

1124

1234

if(debug){

1125

fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);

1235

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

1236

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

1126

1237

}

1127

1238

return true;

1128

1239

}

1129

1240

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

1130

1241

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

1131

1242

if(debug){

1132

fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);

1243

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1244

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

1133

1245

}

1134

1246

return false;

1135

1247

}

1136

1248

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

1137

1249

if(ifr->ifr_flags & IFF_NOARP){

1138

1250

if(debug){

1139

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

1251

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

1252

ifname);

1140

1253

}

1141

1254

return false;

1142

1255

}

1153

1266

* corresponds to an acceptable network device.

1154

1267

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

1155

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1156

1270

int good_interface(const struct dirent *if_entry){

1157

1271

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

1158

1272

return 0;

1161

1275

struct ifreq ifr;

1162

1276

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

1163

1277

if(debug){

1164

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

1165

if_entry->d_name);

1166

}

1167

return 0;

1168

}

1169

1170

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

1171

return 0;

1172

}

1173

return 1;

1174

}

1175

1176

/*

1177

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

1178

* corresponds to an acceptable network device which is up.

1179

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

1180

*/

1181

int up_interface(const struct dirent *if_entry){

1182

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

1183

return 0;

1184

}

1185

1186

struct ifreq ifr;

1187

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

1188

if(debug){

1189

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

1190

if_entry->d_name);

1191

}

1192

return 0;

1193

}

1194

1195

/* Reject down interfaces */

1196

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

1197

if(debug){

1198

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

1199

if_entry->d_name);

1200

}

1201

return 0;

1202

}

1203

1204

/* Reject non-running interfaces */

1205

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

1206

if(debug){

1207

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

1208

if_entry->d_name);

1209

}

1210

return 0;

1211

}

1212

1213

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

1214

return 0;

1215

}

1216

return 1;

1217

}

1218

1278

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

1279

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

1280

}

1281

return 0;

1282

}

1283

1284

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

1285

return 0;

1286

}

1287

return 1;

1288

}

1289

1290

/*

1291

* This function determines if a network interface is up.

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

bool interface_is_up(const char *interface){

1295

struct ifreq ifr;

1296

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

1297

if(debug){

1298

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

1299

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

1300

}

1301

return false;

1302

}

1303

1304

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

1305

}

1306

1307

/*

1308

* This function determines if a network interface is running

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

bool interface_is_running(const char *interface){

1312

struct ifreq ifr;

1313

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

1314

if(debug){

1315

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

1316

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

1317

}

1318

return false;

1319

}

1320

1321

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

1322

}

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1219

1325

int notdotentries(const struct dirent *direntry){

1220

1326

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

1221

1327

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

1228

1334

}

1229

1335

1230

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1231

1338

int runnable_hook(const struct dirent *direntry){

1232

1339

int ret;

1233

1340

size_t sret;

1241

1348

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

1242

1349

"abcdefghijklmnopqrstuvwxyz"

1243

1350

"0123456789"

1244

"_-");

1351

"_.-");

1245

1352

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

1246

1353

/* Contains non-allowed characters */

1247

1354

if(debug){

1248

1355

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

1249

direntry->d_name);

1356

direntry->d_name);

1250

1357

}

1251

1358

return 0;

1252

1359

}

1253

1360

1254

char *fullname = NULL;

1255

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1256

if(ret < 0){

1257

perror_plus("asprintf");

1258

return 0;

1259

}

1260

1261

ret = stat(fullname, &st);

1361

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

1262

1362

if(ret == -1){

1263

1363

if(debug){

1264

1364

perror_plus("Could not stat hook");

1269

1369

/* Not a regular file */

1270

1370

if(debug){

1271

1371

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

1272

direntry->d_name);

1372

direntry->d_name);

1273

1373

}

1274

1374

return 0;

1275

1375

}

1277

1377

/* Not executable */

1278

1378

if(debug){

1279

1379

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

1280

direntry->d_name);

1380

direntry->d_name);

1281

1381

}

1282

1382

return 0;

1283

1383

}

1384

if(debug){

1385

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

1386

direntry->d_name);

1387

}

1284

1388

return 1;

1285

1389

}

1286

1390

1287

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1288

1394

int ret;

1289

1395

struct timespec now;

1290

1396

struct timespec waited_time;

1291

1397

intmax_t block_time;

1292

1398

1293

1399

while(true){

1294

if(mc.current_server == NULL){

1295

if (debug){

1296

fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");

1400

if(mc->current_server == NULL){

1401

if(debug){

1402

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

1403

" No timeout!\n");

1297

1404

}

1298

1405

ret = avahi_simple_poll_iterate(s, -1);

1299

1406

} else {

1300

if (debug){

1301

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

1302

" or wait\n");

1407

if(debug){

1408

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

1409

" it, or wait\n");

1303

1410

}

1304

1411

/* the current time */

1305

1412

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1310

1417

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

1311

1418

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

1312

1419

waited_time.tv_sec = (now.tv_sec

1313

- mc.current_server->last_seen.tv_sec);

1420

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

1314

1421

waited_time.tv_nsec = (now.tv_nsec

1315

- mc.current_server->last_seen.tv_nsec);

1422

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

1316

1423

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

1317

1424

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

1318

1425

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

1320

1427

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

1321

1428

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

1322

1429

1323

if (debug){

1324

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

1430

if(debug){

1431

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

1432

block_time);

1325

1433

}

1326

1434

1327

1435

if(block_time <= 0){

1328

ret = start_mandos_communication(mc.current_server->ip,

1329

mc.current_server->port,

1330

mc.current_server->if_index,

1331

mc.current_server->af);

1436

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

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1332

1440

if(ret == 0){

1333

avahi_simple_poll_quit(mc.simple_poll);

1441

avahi_simple_poll_quit(s);

1334

1442

return 0;

1335

1443

}

1336

1444

ret = clock_gettime(CLOCK_MONOTONIC,

1337

&mc.current_server->last_seen);

1445

&mc->current_server->last_seen);

1338

1446

if(ret == -1){

1339

1447

perror_plus("clock_gettime");

1340

1448

return -1;

1341

1449

}

1342

mc.current_server = mc.current_server->next;

1450

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

1343

1451

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

1344

1452

servers, but don't block */

1345

1453

}

1347

1455

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

1348

1456

}

1349

1457

if(ret != 0){

1350

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

1458

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

1351

1459

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

1352

1460

}

1353

1461

}

1354

1462

}

1355

1463

}

1356

1464

1465

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

1466

__attribute__((warn_unused_result))

1467

error_t raise_privileges(void){

1468

error_t old_errno = errno;

1469

error_t ret_errno = 0;

1470

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

1471

ret_errno = errno;

1472

}

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

1477

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

1478

__attribute__((warn_unused_result))

1479

error_t raise_privileges_permanently(void){

1480

error_t old_errno = errno;

1481

error_t ret_errno = raise_privileges();

1482

if(ret_errno != 0){

1483

errno = old_errno;

1484

return ret_errno;

1485

}

1486

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

1487

ret_errno = errno;

1488

}

1489

errno = old_errno;

1490

return ret_errno;

1491

}

1492

1493

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

1494

__attribute__((warn_unused_result))

1495

error_t lower_privileges(void){

1496

error_t old_errno = errno;

1497

error_t ret_errno = 0;

1498

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

1499

ret_errno = errno;

1500

}

1501

errno = old_errno;

1502

return ret_errno;

1503

}

1504

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

error_t lower_privileges_permanently(void){

1508

error_t old_errno = errno;

1509

error_t ret_errno = 0;

1510

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

1511

ret_errno = errno;

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

__attribute__((nonnull))

1518

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

1519

const float delay){

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

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

1538

runnable_hook, alphasort);

1539

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

1540

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

1541

alphasort);

1542

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

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1547

if(numhooks == -1){

1548

perror_plus("scandir");

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1559

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1621

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1626

free(delaystring);

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

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

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

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

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

if(hook_pid == -1){

1654

perror_plus("fork");

1655

free(direntry);

1656

continue;

1657

}

1658

int status;

1659

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

1660

perror_plus("waitpid");

1661

free(direntry);

1662

continue;

1663

}

1664

if(WIFEXITED(status)){

1665

if(WEXITSTATUS(status) != 0){

1666

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

1667

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

1668

WEXITSTATUS(status));

1669

free(direntry);

1670

continue;

1671

}

1672

} else if(WIFSIGNALED(status)){

1673

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

1674

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

1675

WTERMSIG(status));

1676

free(direntry);

1677

continue;

1678

} else {

1679

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

1680

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

1681

free(direntry);

1682

continue;

1683

}

1684

}

1685

if(debug){

1686

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

1687

direntry->d_name);

1688

}

1689

free(direntry);

1690

}

1691

free(direntries);

1692

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

1693

perror_plus("close");

1694

} else {

1695

hookdir_fd = -1;

1696

}

1697

close(devnull);

1698

}

1699

1700

__attribute__((nonnull, warn_unused_result))

1701

error_t bring_up_interface(const char *const interface,

1702

const float delay){

1703

error_t old_errno = errno;

1704

int ret;

1705

struct ifreq network;

1706

unsigned int if_index = if_nametoindex(interface);

1707

if(if_index == 0){

1708

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

1709

errno = old_errno;

1710

return ENXIO;

1711

}

1712

1713

if(quit_now){

1714

errno = old_errno;

1715

return EINTR;

1716

}

1717

1718

if(not interface_is_up(interface)){

1719

error_t ret_errno = 0, ioctl_errno = 0;

1720

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

1721

ret_errno = errno;

1722

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

1723

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

1724

errno = old_errno;

1725

return ret_errno;

1726

}

1727

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

1728

1729

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

1730

if(sd == -1){

1731

ret_errno = errno;

1732

perror_plus("socket");

1733

errno = old_errno;

1734

return ret_errno;

1735

}

1736

1737

if(quit_now){

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

errno = old_errno;

1743

return EINTR;

1744

}

1745

1746

if(debug){

1747

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

1748

interface);

1749

}

1750

1751

/* Raise privileges */

1752

ret_errno = raise_privileges();

1753

if(ret_errno != 0){

1754

errno = ret_errno;

1755

perror_plus("Failed to raise privileges");

1756

}

1757

1758

#ifdef __linux__

1759

int ret_linux;

1760

bool restore_loglevel = false;

1761

if(ret_errno == 0){

1762

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1763

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

1764

ret_linux = klogctl(8, NULL, 5);

1765

if(ret_linux == -1){

1766

perror_plus("klogctl");

1767

} else {

1768

restore_loglevel = true;

1769

}

1770

}

1771

#endif /* __linux__ */

1772

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

1773

ioctl_errno = errno;

1774

#ifdef __linux__

1775

if(restore_loglevel){

1776

ret_linux = klogctl(7, NULL, 0);

1777

if(ret_linux == -1){

1778

perror_plus("klogctl");

1779

}

1780

}

1781

#endif /* __linux__ */

1782

1783

/* If raise_privileges() succeeded above */

1784

if(ret_errno == 0){

1785

/* Lower privileges */

1786

ret_errno = lower_privileges();

1787

if(ret_errno != 0){

1788

errno = ret_errno;

1789

perror_plus("Failed to lower privileges");

1790

}

1791

}

1792

1793

/* Close the socket */

1794

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

1795

if(ret == -1){

1796

perror_plus("close");

1797

}

1798

1799

if(ret_setflags == -1){

1800

errno = ioctl_errno;

1801

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1802

errno = old_errno;

1803

return ioctl_errno;

1804

}

1805

} else if(debug){

1806

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

1807

interface);

1808

}

1809

1810

/* Sleep checking until interface is running.

1811

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

1812

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

1813

if(interface_is_running(interface)){

1814

break;

1815

}

1816

struct timespec sleeptime = { .tv_nsec = 250000000 };

1817

ret = nanosleep(&sleeptime, NULL);

1818

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

1819

perror_plus("nanosleep");

1820

}

1821

}

1822

1823

errno = old_errno;

1824

return 0;

1825

}

1826

1827

__attribute__((nonnull, warn_unused_result))

1828

error_t take_down_interface(const char *const interface){

1829

error_t old_errno = errno;

1830

struct ifreq network;

1831

unsigned int if_index = if_nametoindex(interface);

1832

if(if_index == 0){

1833

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

1834

errno = old_errno;

1835

return ENXIO;

1836

}

1837

if(interface_is_up(interface)){

1838

error_t ret_errno = 0, ioctl_errno = 0;

1839

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

1840

ret_errno = errno;

1841

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

1842

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

1843

errno = old_errno;

1844

return ret_errno;

1845

}

1846

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

1847

1848

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

1849

if(sd == -1){

1850

ret_errno = errno;

1851

perror_plus("socket");

1852

errno = old_errno;

1853

return ret_errno;

1854

}

1855

1856

if(debug){

1857

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

1858

interface);

1859

}

1860

1861

/* Raise privileges */

1862

ret_errno = raise_privileges();

1863

if(ret_errno != 0){

1864

errno = ret_errno;

1865

perror_plus("Failed to raise privileges");

1866

}

1867

1868

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

1869

ioctl_errno = errno;

1870

1871

/* If raise_privileges() succeeded above */

1872

if(ret_errno == 0){

1873

/* Lower privileges */

1874

ret_errno = lower_privileges();

1875

if(ret_errno != 0){

1876

errno = ret_errno;

1877

perror_plus("Failed to lower privileges");

1878

}

1879

}

1880

1881

/* Close the socket */

1882

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

1883

if(ret == -1){

1884

perror_plus("close");

1885

}

1886

1887

if(ret_setflags == -1){

1888

errno = ioctl_errno;

1889

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1890

errno = old_errno;

1891

return ioctl_errno;

1892

}

1893

} else if(debug){

1894

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

1895

interface);

1896

}

1897

1898

errno = old_errno;

1899

return 0;

1900

}

1901

1357

1902

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

1903

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1904

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

1905

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

1906

.interfaces = NULL, .interfaces_size = 0 };

1358

1907

AvahiSServiceBrowser *sb = NULL;

1359

int error;

1908

error_t ret_errno;

1360

1909

int ret;

1361

1910

intmax_t tmpmax;

1362

1911

char *tmp;

1363

1912

int exitcode = EXIT_SUCCESS;

1364

const char *interface = "";

1365

struct ifreq network;

1366

int sd = -1;

1367

bool take_down_interface = false;

1368

uid_t uid;

1369

gid_t gid;

1370

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

1371

bool tempdir_created = false;

1913

char *interfaces_to_take_down = NULL;

1914

size_t interfaces_to_take_down_size = 0;

1915

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

1916

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

1917

char *tempdir = NULL;

1372

1918

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1373

1919

const char *seckey = PATHDIR "/" SECKEY;

1374

1920

const char *pubkey = PATHDIR "/" PUBKEY;

1921

char *interfaces_hooks = NULL;

1375

1922

1376

1923

bool gnutls_initialized = false;

1377

1924

bool gpgme_initialized = false;

1439

1986

.group = 2 },

1440

1987

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

1441

1988

.arg = "SECONDS",

1442

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

1989

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

1443

1990

.group = 2 },

1444

1991

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

1445

1992

.arg = "DIR",

1468

2015

connect_to = arg;

1469

2016

break;

1470

2017

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

1471

interface = arg;

2018

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

2019

arg, (int)',');

2020

if(ret_errno != 0){

2021

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

2022

}

1472

2023

break;

1473

2024

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

1474

2025

seckey = arg;

1517

2068

argp_state_help(state, state->out_stream,

1518

2069

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1519

2070

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

1520

fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");

1521

2071

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

1522

2072

exit(argp_err_exit_status);

1523

2073

break;

1551

2101

{

1552

2102

/* Work around Debian bug #633582:

1553

2103

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

1554

struct stat st;

1555

1556

/* Re-raise priviliges */

1557

errno = 0;

1558

ret = seteuid(0);

1559

if(ret == -1){

1560

perror_plus("seteuid");

1561

}

1562

1563

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

1564

int seckey_fd = open(seckey, O_RDONLY);

1565

if(seckey_fd == -1){

1566

perror_plus("open");

1567

} else {

1568

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

1569

if(ret == -1){

1570

perror_plus("fstat");

1571

} else {

1572

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

1573

ret = fchown(seckey_fd, uid, gid);

1574

if(ret == -1){

1575

perror_plus("fchown");

1576

}

1577

}

1578

}

1579

TEMP_FAILURE_RETRY(close(seckey_fd));

1580

}

1581

}

1582

1583

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

1584

int pubkey_fd = open(pubkey, O_RDONLY);

1585

if(pubkey_fd == -1){

1586

perror_plus("open");

1587

} else {

1588

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

1589

if(ret == -1){

1590

perror_plus("fstat");

1591

} else {

1592

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

1593

ret = fchown(pubkey_fd, uid, gid);

1594

if(ret == -1){

1595

perror_plus("fchown");

1596

}

1597

}

1598

}

1599

TEMP_FAILURE_RETRY(close(pubkey_fd));

1600

}

1601

}

1602

1603

/* Lower privileges */

1604

errno = 0;

1605

ret = seteuid(uid);

1606

if(ret == -1){

1607

perror_plus("seteuid");

1608

}

1609

}

1610

1611

/* Find network hooks and run them */

1612

{

1613

struct dirent **direntries;

1614

struct dirent *direntry;

1615

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

1616

alphasort);

1617

if(numhooks == -1){

1618

perror_plus("scandir");

2104

2105

/* Re-raise privileges */

2106

ret_errno = raise_privileges();

2107

if(ret_errno != 0){

2108

errno = ret_errno;

2109

perror_plus("Failed to raise privileges");

1619

2110

} else {

1620

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

1621

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

1622

direntry = direntries[0];

1623

char *fullname = NULL;

1624

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1625

if(ret < 0){

1626

perror_plus("asprintf");

1627

continue;

1628

}

1629

pid_t hook_pid = fork();

1630

if(hook_pid == 0){

1631

/* Child */

1632

dup2(devnull, STDIN_FILENO);

1633

close(devnull);

1634

dup2(STDERR_FILENO, STDOUT_FILENO);

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

exit(1);

1639

}

1640

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

1641

if(ret == -1){

1642

perror_plus("setenv");

1643

exit(1);

1644

}

1645

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

1646

if(ret == -1){

1647

perror_plus("setenv");

1648

exit(1);

1649

}

1650

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

1651

if(ret == -1){

1652

perror_plus("setenv");

1653

exit(1);

1654

}

1655

char *delaystring;

1656

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

1657

if(ret == -1){

1658

perror_plus("asprintf");

1659

exit(1);

1660

}

1661

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

1662

if(ret == -1){

1663

free(delaystring);

1664

perror_plus("setenv");

1665

exit(1);

1666

}

1667

free(delaystring);

1668

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

1669

perror_plus("execl");

1670

} else {

1671

int status;

1672

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

1673

perror_plus("waitpid");

1674

free(fullname);

1675

continue;

1676

}

1677

if(WIFEXITED(status)){

1678

if(WEXITSTATUS(status) != 0){

1679

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

1680

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

1681

WEXITSTATUS(status));

1682

free(fullname);

1683

continue;

1684

}

1685

} else if(WIFSIGNALED(status)){

1686

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

1687

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

1688

WTERMSIG(status));

1689

free(fullname);

1690

continue;

1691

} else {

1692

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

1693

direntry->d_name);

1694

free(fullname);

1695

continue;

1696

}

1697

}

1698

free(fullname);

1699

if(quit_now){

1700

goto end;

1701

}

1702

}

1703

close(devnull);

1704

}

2111

struct stat st;

2112

2113

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

2114

int seckey_fd = open(seckey, O_RDONLY);

2115

if(seckey_fd == -1){

2116

perror_plus("open");

2117

} else {

2118

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

2119

if(ret == -1){

2120

perror_plus("fstat");

2121

} else {

2122

if(S_ISREG(st.st_mode)

2123

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

2124

ret = fchown(seckey_fd, uid, gid);

2125

if(ret == -1){

2126

perror_plus("fchown");

2127

}

2128

}

2129

}

2130

TEMP_FAILURE_RETRY(close(seckey_fd));

2131

}

2132

}

2133

2134

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

2135

int pubkey_fd = open(pubkey, O_RDONLY);

2136

if(pubkey_fd == -1){

2137

perror_plus("open");

2138

} else {

2139

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

2140

if(ret == -1){

2141

perror_plus("fstat");

2142

} else {

2143

if(S_ISREG(st.st_mode)

2144

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

2145

ret = fchown(pubkey_fd, uid, gid);

2146

if(ret == -1){

2147

perror_plus("fchown");

2148

}

2149

}

2150

}

2151

TEMP_FAILURE_RETRY(close(pubkey_fd));

2152

}

2153

}

2154

2155

/* Lower privileges */

2156

ret_errno = lower_privileges();

2157

if(ret_errno != 0){

2158

errno = ret_errno;

2159

perror_plus("Failed to lower privileges");

2160

}

2161

}

2162

}

2163

2164

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

2165

{

2166

char *interface = NULL;

2167

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

2168

interface))){

2169

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

2170

and if_nametoindex(interface) == 0){

2171

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

2172

fprintf_plus(stderr, "Not using nonexisting interface"

2173

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

2174

}

2175

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

2176

interface = NULL;

2177

}

2178

}

2179

}

2180

2181

/* Run network hooks */

2182

{

2183

if(mc.interfaces != NULL){

2184

interfaces_hooks = malloc(mc.interfaces_size);

2185

if(interfaces_hooks == NULL){

2186

perror_plus("malloc");

2187

goto end;

2188

}

2189

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

2190

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

2191

}

2192

run_network_hooks("start", interfaces_hooks != NULL ?

2193

interfaces_hooks : "", delay);

1705

2194

}

1706

2195

1707

2196

if(not debug){

1708

2197

avahi_set_log_function(empty_log);

1709

2198

}

1710

2199

1711

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

1712

struct dirent **direntries;

1713

/* First look for interfaces that are up */

1714

ret = scandir(sys_class_net, &direntries, up_interface,

1715

alphasort);

1716

if(ret == 0){

1717

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

1718

free(direntries);

1719

ret = scandir(sys_class_net, &direntries, good_interface,

1720

alphasort);

1721

}

1722

if(ret >= 1){

1723

/* Pick the first interface returned */

1724

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

1725

if(debug){

1726

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

1727

}

1728

if(interface == NULL){

1729

perror_plus("malloc");

1730

free(direntries);

1731

exitcode = EXIT_FAILURE;

1732

goto end;

1733

}

1734

free(direntries);

1735

} else {

1736

free(direntries);

1737

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

1738

exitcode = EXIT_FAILURE;

1739

goto end;

1740

}

1741

}

1742

1743

2200

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

1744

2201

from the signal handler */

1745

2202

/* Initialize the pseudo-RNG for Avahi */

1746

2203

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

1747

mc.simple_poll = avahi_simple_poll_new();

1748

if(mc.simple_poll == NULL){

1749

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

2204

simple_poll = avahi_simple_poll_new();

2205

if(simple_poll == NULL){

2206

fprintf_plus(stderr,

2207

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

1750

2208

exitcode = EX_UNAVAILABLE;

1751

2209

goto end;

1752

2210

}

1814

2272

}

1815

2273

}

1816

2274

1817

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

1818

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

1819

if_index = (AvahiIfIndex) if_nametoindex(interface);

1820

if(if_index == 0){

1821

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

1822

exitcode = EX_UNAVAILABLE;

1823

goto end;

1824

}

1825

1826

if(quit_now){

1827

goto end;

1828

}

1829

1830

/* Re-raise priviliges */

1831

errno = 0;

1832

ret = seteuid(0);

1833

if(ret == -1){

1834

perror_plus("seteuid");

1835

}

1836

1837

#ifdef __linux__

1838

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1839

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

1840

ret = klogctl(8, NULL, 5);

1841

bool restore_loglevel = true;

1842

if(ret == -1){

1843

restore_loglevel = false;

1844

perror_plus("klogctl");

1845

}

1846

#endif /* __linux__ */

1847

1848

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1849

if(sd < 0){

1850

perror_plus("socket");

1851

exitcode = EX_OSERR;

1852

#ifdef __linux__

1853

if(restore_loglevel){

1854

ret = klogctl(7, NULL, 0);

1855

if(ret == -1){

1856

perror_plus("klogctl");

1857

}

1858

}

1859

#endif /* __linux__ */

1860

/* Lower privileges */

1861

errno = 0;

1862

ret = seteuid(uid);

1863

if(ret == -1){

1864

perror_plus("seteuid");

1865

}

1866

goto end;

1867

}

1868

strcpy(network.ifr_name, interface);

1869

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

1870

if(ret == -1){

1871

perror_plus("ioctl SIOCGIFFLAGS");

1872

#ifdef __linux__

1873

if(restore_loglevel){

1874

ret = klogctl(7, NULL, 0);

1875

if(ret == -1){

1876

perror_plus("klogctl");

1877

}

1878

}

1879

#endif /* __linux__ */

1880

exitcode = EX_OSERR;

1881

/* Lower privileges */

1882

errno = 0;

1883

ret = seteuid(uid);

1884

if(ret == -1){

1885

perror_plus("seteuid");

1886

}

1887

goto end;

1888

}

1889

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

1890

network.ifr_flags |= IFF_UP;

1891

take_down_interface = true;

1892

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

1893

if(ret == -1){

1894

take_down_interface = false;

1895

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1896

exitcode = EX_OSERR;

1897

#ifdef __linux__

1898

if(restore_loglevel){

1899

ret = klogctl(7, NULL, 0);

1900

if(ret == -1){

1901

perror_plus("klogctl");

2275

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

2276

if(mc.interfaces == NULL){

2277

struct dirent **direntries = NULL;

2278

/* Look for any good interfaces */

2279

ret = scandir(sys_class_net, &direntries, good_interface,

2280

alphasort);

2281

if(ret >= 1){

2282

/* Add all found interfaces to interfaces list */

2283

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

2284

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

2285

direntries[i]->d_name);

2286

if(ret_errno != 0){

2287

errno = ret_errno;

2288

perror_plus("argz_add");

2289

free(direntries[i]);

2290

continue;

2291

}

2292

if(debug){

2293

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

2294

direntries[i]->d_name);

2295

}

2296

free(direntries[i]);

2297

}

2298

free(direntries);

2299

} else {

2300

if(ret == 0){

2301

free(direntries);

2302

}

2303

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

2304

exitcode = EXIT_FAILURE;

2305

goto end;

2306

}

2307

}

2308

2309

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

2310

{

2311

char *interface = NULL;

2312

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

2313

interface))){

2314

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

2315

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

2316

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

2317

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

2318

interface);

2319

interface = NULL;

2320

while((interface = argz_next(mc.interfaces,

2321

mc.interfaces_size, interface))){

2322

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

2323

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

2324

interface);

2325

interface = NULL;

1902

2326

}

1903

2327

}

1904

#endif /* __linux__ */

1905

/* Lower privileges */

1906

errno = 0;

1907

ret = seteuid(uid);

1908

if(ret == -1){

1909

perror_plus("seteuid");

1910

}

1911

goto end;

1912

}

1913

}

1914

/* Sleep checking until interface is running.

1915

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

1916

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

1917

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

1918

if(ret == -1){

1919

perror_plus("ioctl SIOCGIFFLAGS");

1920

} else if(network.ifr_flags & IFF_RUNNING){

1921

2328

break;

1922

2329

}

1923

struct timespec sleeptime = { .tv_nsec = 250000000 };

1924

ret = nanosleep(&sleeptime, NULL);

1925

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

1926

perror_plus("nanosleep");

1927

}

1928

}

1929

if(not take_down_interface){

1930

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

1931

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

1932

if(ret == -1){

1933

perror_plus("close");

1934

}

1935

}

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

/* Restores kernel loglevel to default */

1939

ret = klogctl(7, NULL, 0);

1940

if(ret == -1){

1941

perror_plus("klogctl");

1942

}

1943

}

1944

#endif /* __linux__ */

1945

/* Lower privileges */

1946

errno = 0;

1947

if(take_down_interface){

1948

/* Lower privileges */

1949

ret = seteuid(uid);

1950

if(ret == -1){

1951

perror_plus("seteuid");

1952

}

1953

} else {

1954

/* Lower privileges permanently */

1955

ret = setuid(uid);

1956

if(ret == -1){

1957

perror_plus("setuid");

1958

}

1959

}

2330

bool interface_was_up = interface_is_up(interface);

2331

errno = bring_up_interface(interface, delay);

2332

if(not interface_was_up){

2333

if(errno != 0){

2334

perror_plus("Failed to bring up interface");

2335

} else {

2336

errno = argz_add(&interfaces_to_take_down,

2337

&interfaces_to_take_down_size,

2338

interface);

2339

if(errno != 0){

2340

perror_plus("argz_add");

2341

}

2342

}

2343

}

2344

}

2345

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

2346

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

2347

}

2348

}

2349

2350

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

2351

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

2352

if(debug){

2353

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

2354

mc.interfaces);

2355

}

2356

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

1960

2357

}

1961

2358

1962

2359

if(quit_now){

1963

2360

goto end;

1964

2361

}

1965

2362

1966

ret = init_gnutls_global(pubkey, seckey);

2363

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

1967

2364

if(ret == -1){

1968

2365

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

1969

2366

exitcode = EX_UNAVAILABLE;

1976

2373

goto end;

1977

2374

}

1978

2375

1979

if(mkdtemp(tempdir) == NULL){

2376

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

2377

tempdir = mkdtemp(run_tempdir);

2378

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

2379

if(debug){

2380

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

2381

run_tempdir, old_tempdir);

2382

}

2383

tempdir = mkdtemp(old_tempdir);

2384

}

2385

if(tempdir == NULL){

1980

2386

perror_plus("mkdtemp");

1981

2387

goto end;

1982

2388

}

1983

tempdir_created = true;

1984

2389

1985

2390

if(quit_now){

1986

2391

goto end;

1987

2392

}

1988

2393

1989

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

2394

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

1990

2395

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

1991

2396

exitcode = EX_UNAVAILABLE;

1992

2397

goto end;

2002

2407

/* Connect directly, do not use Zeroconf */

2003

2408

/* (Mainly meant for debugging) */

2004

2409

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

2410

2005

2411

if(address == NULL){

2006

2412

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

2007

2413

exitcode = EX_USAGE;

2012

2418

goto end;

2013

2419

}

2014

2420

2015

uint16_t port;

2421

in_port_t port;

2016

2422

errno = 0;

2017

2423

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

2018

2424

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

2019

or tmpmax != (uint16_t)tmpmax){

2425

or tmpmax != (in_port_t)tmpmax){

2020

2426

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

2021

2427

exitcode = EX_USAGE;

2022

2428

goto end;

2023

2429

}

2024

2430

2025

2431

if(quit_now){

2026

2432

goto end;

2027

2433

}

2028

2434

2029

port = (uint16_t)tmpmax;

2435

port = (in_port_t)tmpmax;

2030

2436

*address = '\0';

2031

2437

/* Colon in address indicates IPv6 */

2032

2438

int af;

2048

2454

}

2049

2455

2050

2456

while(not quit_now){

2051

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

2457

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

2458

&mc);

2052

2459

if(quit_now or ret == 0){

2053

2460

break;

2054

2461

}

2055

2462

if(debug){

2056

fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);

2463

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

2464

(int)retry_interval);

2057

2465

}

2058

sleep((int)retry_interval);

2466

sleep((unsigned int)retry_interval);

2059

2467

}

2060

2468

2061

if (not quit_now){

2469

if(not quit_now){

2062

2470

exitcode = EXIT_SUCCESS;

2063

2471

}

2064

2472

2079

2487

config.publish_domain = 0;

2080

2488

2081

2489

/* Allocate a new server */

2082

mc.server = avahi_server_new(avahi_simple_poll_get

2083

(mc.simple_poll), &config, NULL,

2084

NULL, &error);

2490

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2491

&config, NULL, NULL, &ret_errno);

2085

2492

2086

2493

/* Free the Avahi configuration data */

2087

2494

avahi_server_config_free(&config);

2090

2497

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

2091

2498

if(mc.server == NULL){

2092

2499

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

2093

avahi_strerror(error));

2500

avahi_strerror(ret_errno));

2094

2501

exitcode = EX_UNAVAILABLE;

2095

2502

goto end;

2096

2503

}

2102

2509

/* Create the Avahi service browser */

2103

2510

sb = avahi_s_service_browser_new(mc.server, if_index,

2104

2511

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2105

NULL, 0, browse_callback, NULL);

2512

NULL, 0, browse_callback,

2513

(void *)&mc);

2106

2514

if(sb == NULL){

2107

2515

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

2108

avahi_strerror(avahi_server_errno(mc.server)));

2516

avahi_strerror(avahi_server_errno(mc.server)));

2109

2517

exitcode = EX_UNAVAILABLE;

2110

2518

goto end;

2111

2519

}

2119

2527

if(debug){

2120

2528

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

2121

2529

}

2122

2123

ret = avahi_loop_with_timeout(mc.simple_poll,

2124

(int)(retry_interval * 1000));

2530

2531

ret = avahi_loop_with_timeout(simple_poll,

2532

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

2125

2533

if(debug){

2126

2534

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

2127

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

2535

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

2128

2536

}

2129

2537

2130

2538

end:

2134

2542

}

2135

2543

2136

2544

/* Cleanup things */

2545

free(mc.interfaces);

2546

2137

2547

if(sb != NULL)

2138

2548

avahi_s_service_browser_free(sb);

2139

2549

2140

2550

if(mc.server != NULL)

2141

2551

avahi_server_free(mc.server);

2142

2552

2143

if(mc.simple_poll != NULL)

2144

avahi_simple_poll_free(mc.simple_poll);

2553

if(simple_poll != NULL)

2554

avahi_simple_poll_free(simple_poll);

2145

2555

2146

2556

if(gnutls_initialized){

2147

2557

gnutls_certificate_free_credentials(mc.cred);

2152

2562

if(gpgme_initialized){

2153

2563

gpgme_release(mc.ctx);

2154

2564

}

2155

2565

2156

2566

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

2157

2567

has seen */

2158

2568

if(mc.current_server != NULL){

2159

2569

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

2160

2570

while(mc.current_server != NULL){

2161

2571

server *next = mc.current_server->next;

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic push

2574

#pragma GCC diagnostic ignored "-Wcast-qual"

2575

#endif

2576

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

2577

#ifdef __GNUC__

2578

#pragma GCC diagnostic pop

2579

#endif

2162

2580

free(mc.current_server);

2163

2581

mc.current_server = next;

2164

2582

}

2165

2583

}

2166

2584

2167

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

2168

2169

/* Take down the network interface */

2170

if(take_down_interface){

2171

/* Re-raise priviliges */

2172

errno = 0;

2173

ret = seteuid(0);

2174

if(ret == -1){

2175

perror_plus("seteuid");

2585

/* Re-raise privileges */

2586

{

2587

ret_errno = raise_privileges();

2588

if(ret_errno != 0){

2589

errno = ret_errno;

2590

perror_plus("Failed to raise privileges");

2591

} else {

2592

2593

/* Run network hooks */

2594

run_network_hooks("stop", interfaces_hooks != NULL ?

2595

interfaces_hooks : "", delay);

2596

2597

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

2598

{

2599

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to take down interface");

2607

}

2608

}

2609

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

2610

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

2611

" down\n");

2612

}

2613

}

2176

2614

}

2177

if(geteuid() == 0){

2178

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

2179

if(ret == -1){

2180

perror_plus("ioctl SIOCGIFFLAGS");

2181

} else if(network.ifr_flags & IFF_UP){

2182

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

2183

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

2184

if(ret == -1){

2185

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2186

}

2187

}

2188

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

2189

if(ret == -1){

2190

perror_plus("close");

2191

}

2192

/* Lower privileges permanently */

2193

errno = 0;

2194

ret = setuid(uid);

2195

if(ret == -1){

2196

perror_plus("setuid");

2197

}

2615

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

errno = ret_errno;

2619

perror_plus("Failed to lower privileges permanently");

2198

2620

}

2199

2621

}

2200

2622

2623

free(interfaces_to_take_down);

2624

free(interfaces_hooks);

2625

2201

2626

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

2202

if(tempdir_created){

2627

if(tempdir != NULL){

2203

2628

struct dirent **direntries = NULL;

2204

struct dirent *direntry = NULL;

2205

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

2206

alphasort);

2207

if (numentries > 0){

2208

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

2209

direntry = direntries[i];

2210

char *fullname = NULL;

2211

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

2212

direntry->d_name);

2213

if(ret < 0){

2214

perror_plus("asprintf");

2215

continue;

2216

}

2217

ret = remove(fullname);

2218

if(ret == -1){

2219

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));

2220

}

2221

free(fullname);

2629

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

2630

O_NOFOLLOW));

2631

if(tempdir_fd == -1){

2632

perror_plus("open");

2633

} else {

2634

#ifdef __GLIBC__

2635

#if __GLIBC_PREREQ(2, 15)

2636

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

2637

notdotentries, alphasort);

2638

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

2639

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

2640

alphasort);

2641

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

2642

#else /* not __GLIBC__ */

2643

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

2644

alphasort);

2645

#endif /* not __GLIBC__ */

2646

if(numentries >= 0){

2647

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

2648

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

2649

if(ret == -1){

2650

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

2651

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

2652

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

2653

}

2654

free(direntries[i]);

2655

}

2656

2657

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

2658

free(direntries);

2659

if(numentries == -1){

2660

perror_plus("scandir");

2661

}

2662

ret = rmdir(tempdir);

2663

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

2664

perror_plus("rmdir");

2665

}

2222

2666

}

2223

}

2224

2225

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

2226

free(direntries);

2227

if (numentries == -1){

2228

perror_plus("scandir");

2229

}

2230

ret = rmdir(tempdir);

2231

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

2232

perror_plus("rmdir");

2667

TEMP_FAILURE_RETRY(close(tempdir_fd));

2233

2668

}

2234

2669

}

2235

2670