/mandos/trunk : revision 949

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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

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* published by the Free Software Foundation, either version 3 of the

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* License, or (at your option) any later version.

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*

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* This program is distributed in the hope that it will be useful, but

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*

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* This file is part of Mandos.

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*

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* Mandos is free software: you can redistribute it and/or modify it

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* under the terms of the GNU General Public License as published by

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* the Free Software Foundation, either version 3 of the License, or

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* (at your option) any later version.

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*

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* Mandos is distributed in the hope that it will be useful, but

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* WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* General Public License for more details.

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*

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* You should have received a copy of the GNU General Public License

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* along with this program. If not, see

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* <http://www.gnu.org/licenses/>.

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* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

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*

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* Contact the authors at <mandos@recompile.se>.

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*/

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

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34

#ifndef _LARGEFILE_SOURCE

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35

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

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

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

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

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asprintf(), strncpy(), strsignal()

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*/

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53

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

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54

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

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sockaddr_in6, PF_INET6,

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57

opendir(), DIR */

56

58

#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(),

61

getnameinfo() */

62

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

60

63

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

61

64

*/

62

65

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

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66

strtoimax() */

64

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

67

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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72

program_invocation_short_name */

66

73

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

67

74

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

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*/

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80

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

74

81

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

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setgid(), pause(), _exit() */

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

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

83

unlinkat() */

84

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

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

78

86

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

79

87

argp_state, struct argp,

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99

argz_delete(), argz_append(),

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100

argz_stringify(), argz_add(),

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101

argz_count() */

102

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

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EAI_SYSTEM, gai_strerror() */

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104

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105

#ifdef __linux__

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

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148

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

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149

char *connect_to = NULL;

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150

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

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uid_t uid = 65534;

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gid_t gid = 65534;

143

154

180

191

perror(print_text);

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192

}

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193

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

194

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

184

195

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

185

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va_list ap;

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197

va_start (ap, format);

195

206

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

196

207

* "buffer_length" is how much is already used.

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208

*/

209

__attribute__((nonnull, warn_unused_result))

198

210

size_t incbuffer(char **buffer, size_t buffer_length,

199

211

size_t buffer_capacity){

200

212

if(buffer_length + BUFFER_SIZE > buffer_capacity){

213

225

}

214

226

215

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

228

__attribute__((nonnull, warn_unused_result))

216

229

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

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230

int af, server **current_server){

218

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int ret;

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240

.af = af };

228

241

if(new_server->ip == NULL){

229

242

perror_plus("strdup");

243

free(new_server);

244

return false;

245

}

246

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

247

if(ret == -1){

248

perror_plus("clock_gettime");

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#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

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

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

257

free(new_server);

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258

return false;

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259

}

232

260

/* Special case of first server */

234

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new_server->next = new_server;

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new_server->prev = new_server;

236

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*current_server = new_server;

237

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

238

265

} else {

266

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

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new_server->next = *current_server;

240

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

241

269

new_server->prev->next = new_server;

242

270

(*current_server)->prev = new_server;

243

271

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

return false;

248

}

249

272

return true;

250

273

}

251

274

252

275

/*

253

276

* Initialize GPGME.

254

277

*/

255

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

256

const char *tempdir, mandos_context *mc){

278

__attribute__((nonnull, warn_unused_result))

279

static bool init_gpgme(const char * const seckey,

280

const char * const pubkey,

281

const char * const tempdir,

282

mandos_context *mc){

257

283

gpgme_error_t rc;

258

284

gpgme_engine_info_t engine_info;

259

285

260

286

/*

261

287

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

262

288

*/

263

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

264

290

int ret;

265

291

int fd;

266

292

gpgme_data_t pgp_data;

284

310

gpgme_strsource(rc), gpgme_strerror(rc));

285

311

return false;

286

312

}

313

{

314

gpgme_import_result_t import_result

315

= gpgme_op_import_result(mc->ctx);

316

if((import_result->imported < 1

317

or import_result->not_imported > 0)

318

and import_result->unchanged == 0){

319

fprintf_plus(stderr, "bad gpgme_op_import_results:\n");

320

fprintf_plus(stderr,

321

"The total number of considered keys: %d\n",

322

import_result->considered);

323

fprintf_plus(stderr,

324

"The number of keys without user ID: %d\n",

325

import_result->no_user_id);

326

fprintf_plus(stderr,

327

"The total number of imported keys: %d\n",

328

import_result->imported);

329

fprintf_plus(stderr, "The number of imported RSA keys: %d\n",

330

import_result->imported_rsa);

331

fprintf_plus(stderr, "The number of unchanged keys: %d\n",

332

import_result->unchanged);

333

fprintf_plus(stderr, "The number of new user IDs: %d\n",

334

import_result->new_user_ids);

335

fprintf_plus(stderr, "The number of new sub keys: %d\n",

336

import_result->new_sub_keys);

337

fprintf_plus(stderr, "The number of new signatures: %d\n",

338

import_result->new_signatures);

339

fprintf_plus(stderr, "The number of new revocations: %d\n",

340

import_result->new_revocations);

341

fprintf_plus(stderr,

342

"The total number of secret keys read: %d\n",

343

import_result->secret_read);

344

fprintf_plus(stderr,

345

"The number of imported secret keys: %d\n",

346

import_result->secret_imported);

347

fprintf_plus(stderr,

348

"The number of unchanged secret keys: %d\n",

349

import_result->secret_unchanged);

350

fprintf_plus(stderr, "The number of keys not imported: %d\n",

351

import_result->not_imported);

352

for(gpgme_import_status_t import_status

353

= import_result->imports;

354

import_status != NULL;

355

import_status = import_status->next){

356

fprintf_plus(stderr, "Import status for key: %s\n",

357

import_status->fpr);

358

if(import_status->result != GPG_ERR_NO_ERROR){

359

fprintf_plus(stderr, "Import result: %s: %s\n",

360

gpgme_strsource(import_status->result),

361

gpgme_strerror(import_status->result));

362

}

363

fprintf_plus(stderr, "Key status:\n");

364

fprintf_plus(stderr,

365

import_status->status & GPGME_IMPORT_NEW

366

? "The key was new.\n"

367

: "The key was not new.\n");

368

fprintf_plus(stderr,

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import_status->status & GPGME_IMPORT_UID

370

? "The key contained new user IDs.\n"

371

: "The key did not contain new user IDs.\n");

372

fprintf_plus(stderr,

373

import_status->status & GPGME_IMPORT_SIG

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? "The key contained new signatures.\n"

375

: "The key did not contain new signatures.\n");

376

fprintf_plus(stderr,

377

import_status->status & GPGME_IMPORT_SUBKEY

378

? "The key contained new sub keys.\n"

379

: "The key did not contain new sub keys.\n");

380

fprintf_plus(stderr,

381

import_status->status & GPGME_IMPORT_SECRET

382

? "The key contained a secret key.\n"

383

: "The key did not contain a secret key.\n");

384

}

385

return false;

386

}

387

}

287

388

288

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

389

ret = close(fd);

289

390

if(ret == -1){

290

391

perror_plus("close");

291

392

}

330

431

/* Create new GPGME "context" */

331

432

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

332

433

if(rc != GPG_ERR_NO_ERROR){

333

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

334

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

335

gpgme_strerror(rc));

434

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

435

gpgme_strsource(rc), gpgme_strerror(rc));

336

436

return false;

337

437

}

338

438

347

447

* Decrypt OpenPGP data.

348

448

* Returns -1 on error

349

449

*/

450

__attribute__((nonnull, warn_unused_result))

350

451

static ssize_t pgp_packet_decrypt(const char *cryptotext,

351

452

size_t crypto_size,

352

453

char **plaintext,

373

474

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

374

475

rc = gpgme_data_new(&dh_plain);

375

476

if(rc != GPG_ERR_NO_ERROR){

376

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

377

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

477

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

378

478

gpgme_strsource(rc), gpgme_strerror(rc));

379

479

gpgme_data_release(dh_crypto);

380

480

return -1;

393

493

if(result == NULL){

394

494

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

395

495

} else {

396

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

397

result->unsupported_algorithm);

398

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

399

result->wrong_key_usage);

496

if(result->unsupported_algorithm != NULL) {

497

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

498

result->unsupported_algorithm);

499

}

500

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

501

result->wrong_key_usage ? "Yes" : "No");

400

502

if(result->file_name != NULL){

401

503

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

402

504

}

403

gpgme_recipient_t recipient;

404

recipient = result->recipients;

405

while(recipient != NULL){

505

506

for(gpgme_recipient_t r = result->recipients; r != NULL;

507

r = r->next){

406

508

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

407

gpgme_pubkey_algo_name

408

(recipient->pubkey_algo));

409

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

509

gpgme_pubkey_algo_name(r->pubkey_algo));

510

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

410

511

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

411

recipient->status == GPG_ERR_NO_SECKEY

412

? "No" : "Yes");

413

recipient = recipient->next;

512

r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");

414

513

}

415

514

}

416

515

}

472

571

return plaintext_length;

473

572

}

474

573

475

static const char * safer_gnutls_strerror(int value){

574

__attribute__((warn_unused_result, const))

575

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

576

if(str == NULL)

577

return "(unknown)";

578

return str;

579

}

580

581

__attribute__((warn_unused_result))

582

static const char *safer_gnutls_strerror(int value){

476

583

const char *ret = gnutls_strerror(value);

477

if(ret == NULL)

478

ret = "(unknown)";

479

return ret;

584

return safe_string(ret);

480

585

}

481

586

482

587

/* GnuTLS log function callback */

588

__attribute__((nonnull))

483

589

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

484

590

const char* string){

485

591

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

486

592

}

487

593

594

__attribute__((nonnull(1, 2, 4), warn_unused_result))

488

595

static int init_gnutls_global(const char *pubkeyfilename,

489

596

const char *seckeyfilename,

597

const char *dhparamsfilename,

490

598

mandos_context *mc){

491

599

int ret;

600

unsigned int uret;

492

601

493

602

if(debug){

494

603

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

495

604

}

496

605

497

ret = gnutls_global_init();

498

if(ret != GNUTLS_E_SUCCESS){

499

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

500

safer_gnutls_strerror(ret));

501

return -1;

502

}

503

504

606

if(debug){

505

607

/* "Use a log level over 10 to enable all debugging options."

506

608

* - GnuTLS manual

514

616

if(ret != GNUTLS_E_SUCCESS){

515

617

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

516

618

safer_gnutls_strerror(ret));

517

gnutls_global_deinit();

518

619

return -1;

519

620

}

520

621

545

646

safer_gnutls_strerror(ret));

546

647

goto globalfail;

547

648

}

548

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

549

if(ret != GNUTLS_E_SUCCESS){

550

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

551

safer_gnutls_strerror(ret));

552

goto globalfail;

553

}

554

649

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

650

if(dhparamsfilename != NULL){

651

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

652

do {

653

int dhpfile = open(dhparamsfilename, O_RDONLY);

654

if(dhpfile == -1){

655

perror_plus("open");

656

dhparamsfilename = NULL;

657

break;

658

}

659

size_t params_capacity = 0;

660

while(true){

661

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

662

(size_t)params.size,

663

(size_t)params_capacity);

664

if(params_capacity == 0){

665

perror_plus("incbuffer");

666

free(params.data);

667

params.data = NULL;

668

dhparamsfilename = NULL;

669

break;

670

}

671

ssize_t bytes_read = read(dhpfile,

672

params.data + params.size,

673

BUFFER_SIZE);

674

/* EOF */

675

if(bytes_read == 0){

676

break;

677

}

678

/* check bytes_read for failure */

679

if(bytes_read < 0){

680

perror_plus("read");

681

free(params.data);

682

params.data = NULL;

683

dhparamsfilename = NULL;

684

break;

685

}

686

params.size += (unsigned int)bytes_read;

687

}

688

ret = close(dhpfile);

689

if(ret == -1){

690

perror_plus("close");

691

}

692

if(params.data == NULL){

693

dhparamsfilename = NULL;

694

}

695

if(dhparamsfilename == NULL){

696

break;

697

}

698

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

699

GNUTLS_X509_FMT_PEM);

700

if(ret != GNUTLS_E_SUCCESS){

701

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

702

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

703

safer_gnutls_strerror(ret));

704

dhparamsfilename = NULL;

705

}

706

free(params.data);

707

} while(false);

708

}

709

if(dhparamsfilename == NULL){

710

if(mc->dh_bits == 0){

711

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

712

/* Try to read the private key file */

713

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

714

do {

715

int secfile = open(seckeyfilename, O_RDONLY);

716

if(secfile == -1){

717

perror_plus("open");

718

break;

719

}

720

size_t buffer_capacity = 0;

721

while(true){

722

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

723

(size_t)buffer.size,

724

(size_t)buffer_capacity);

725

if(buffer_capacity == 0){

726

perror_plus("incbuffer");

727

free(buffer.data);

728

buffer.data = NULL;

729

break;

730

}

731

ssize_t bytes_read = read(secfile,

732

buffer.data + buffer.size,

733

BUFFER_SIZE);

734

/* EOF */

735

if(bytes_read == 0){

736

break;

737

}

738

/* check bytes_read for failure */

739

if(bytes_read < 0){

740

perror_plus("read");

741

free(buffer.data);

742

buffer.data = NULL;

743

break;

744

}

745

buffer.size += (unsigned int)bytes_read;

746

}

747

close(secfile);

748

} while(false);

749

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

750

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

751

if(buffer.data != NULL){

752

{

753

gnutls_openpgp_privkey_t privkey = NULL;

754

ret = gnutls_openpgp_privkey_init(&privkey);

755

if(ret != GNUTLS_E_SUCCESS){

756

fprintf_plus(stderr, "Error initializing OpenPGP key"

757

" structure: %s",

758

safer_gnutls_strerror(ret));

759

free(buffer.data);

760

buffer.data = NULL;

761

} else {

762

ret = gnutls_openpgp_privkey_import

763

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

764

if(ret != GNUTLS_E_SUCCESS){

765

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

766

safer_gnutls_strerror(ret));

767

privkey = NULL;

768

}

769

free(buffer.data);

770

buffer.data = NULL;

771

if(privkey != NULL){

772

/* Use private key to suggest an appropriate

773

sec_param */

774

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

775

gnutls_openpgp_privkey_deinit(privkey);

776

if(debug){

777

fprintf_plus(stderr, "This OpenPGP key implies using"

778

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

779

safe_string(gnutls_sec_param_get_name

780

(sec_param)));

781

}

782

}

783

}

784

}

785

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

786

/* Err on the side of caution */

787

sec_param = GNUTLS_SEC_PARAM_ULTRA;

788

if(debug){

789

fprintf_plus(stderr, "Falling back to security parameter"

790

" \"%s\"\n",

791

safe_string(gnutls_sec_param_get_name

792

(sec_param)));

793

}

794

}

795

}

796

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

797

if(uret != 0){

798

mc->dh_bits = uret;

799

if(debug){

800

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

801

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

802

safe_string(gnutls_sec_param_get_name

803

(sec_param)),

804

mc->dh_bits);

805

}

806

} else {

807

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

808

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

809

safe_string(gnutls_sec_param_get_name

810

(sec_param)),

811

safer_gnutls_strerror(ret));

812

goto globalfail;

813

}

814

} else if(debug){

815

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

816

mc->dh_bits);

817

}

818

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

819

if(ret != GNUTLS_E_SUCCESS){

820

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

821

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

822

safer_gnutls_strerror(ret));

823

goto globalfail;

824

}

825

}

555

826

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

556

827

557

828

return 0;

559

830

globalfail:

560

831

561

832

gnutls_certificate_free_credentials(mc->cred);

562

gnutls_global_deinit();

563

833

gnutls_dh_params_deinit(mc->dh_params);

564

834

return -1;

565

835

}

566

836

837

__attribute__((nonnull, warn_unused_result))

567

838

static int init_gnutls_session(gnutls_session_t *session,

568

839

mandos_context *mc){

569

840

int ret;

616

887

/* ignore client certificate if any. */

617

888

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

618

889

619

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

620

621

890

return 0;

622

891

}

623

892

625

894

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

626

895

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

627

896

897

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

898

__attribute__((warn_unused_result))

899

int raise_privileges(void){

900

int old_errno = errno;

901

int ret = 0;

902

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

903

ret = errno;

904

}

905

errno = old_errno;

906

return ret;

907

}

908

909

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

910

__attribute__((warn_unused_result))

911

int raise_privileges_permanently(void){

912

int old_errno = errno;

913

int ret = raise_privileges();

914

if(ret != 0){

915

errno = old_errno;

916

return ret;

917

}

918

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

919

ret = errno;

920

}

921

errno = old_errno;

922

return ret;

923

}

924

925

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

926

__attribute__((warn_unused_result))

927

int lower_privileges(void){

928

int old_errno = errno;

929

int ret = 0;

930

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

931

ret = errno;

932

}

933

errno = old_errno;

934

return ret;

935

}

936

937

/* Lower privileges permanently */

938

__attribute__((warn_unused_result))

939

int lower_privileges_permanently(void){

940

int old_errno = errno;

941

int ret = 0;

942

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

943

ret = errno;

944

}

945

errno = old_errno;

946

return ret;

947

}

948

949

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

950

__attribute__((nonnull, warn_unused_result))

951

static bool add_delete_local_route(const bool add,

952

const char *address,

953

AvahiIfIndex if_index){

954

int ret;

955

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

956

char add_arg[] = "add";

957

char delete_arg[] = "delete";

958

char debug_flag[] = "--debug";

959

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

960

if(pluginhelperdir == NULL){

961

if(debug){

962

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

963

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

964

}

965

return false;

966

}

967

968

char interface[IF_NAMESIZE];

969

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

970

perror_plus("if_indextoname");

971

return false;

972

}

973

974

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

975

if(devnull == -1){

976

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

977

return false;

978

}

979

pid_t pid = fork();

980

if(pid == 0){

981

/* Child */

982

/* Raise privileges */

983

errno = raise_privileges_permanently();

984

if(errno != 0){

985

perror_plus("Failed to raise privileges");

986

/* _exit(EX_NOPERM); */

987

} else {

988

/* Set group */

989

errno = 0;

990

ret = setgid(0);

991

if(ret == -1){

992

perror_plus("setgid");

993

_exit(EX_NOPERM);

994

}

995

/* Reset supplementary groups */

996

errno = 0;

997

ret = setgroups(0, NULL);

998

if(ret == -1){

999

perror_plus("setgroups");

1000

_exit(EX_NOPERM);

1001

}

1002

}

1003

ret = dup2(devnull, STDIN_FILENO);

1004

if(ret == -1){

1005

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

1006

_exit(EX_OSERR);

1007

}

1008

ret = close(devnull);

1009

if(ret == -1){

1010

perror_plus("close");

1011

_exit(EX_OSERR);

1012

}

1013

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1014

if(ret == -1){

1015

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

1016

_exit(EX_OSERR);

1017

}

1018

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

1019

O_RDONLY

1020

| O_DIRECTORY

1021

| O_PATH

1022

| O_CLOEXEC));

1023

if(helperdir_fd == -1){

1024

perror_plus("open");

1025

_exit(EX_UNAVAILABLE);

1026

}

1027

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

1028

helper, O_RDONLY));

1029

if(helper_fd == -1){

1030

perror_plus("openat");

1031

close(helperdir_fd);

1032

_exit(EX_UNAVAILABLE);

1033

}

1034

close(helperdir_fd);

1035

#ifdef __GNUC__

1036

#pragma GCC diagnostic push

1037

#pragma GCC diagnostic ignored "-Wcast-qual"

1038

#endif

1039

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

1040

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

1041

interface, debug ? debug_flag : NULL, NULL },

1042

environ) == -1){

1043

#ifdef __GNUC__

1044

#pragma GCC diagnostic pop

1045

#endif

1046

perror_plus("fexecve");

1047

_exit(EXIT_FAILURE);

1048

}

1049

}

1050

if(pid == -1){

1051

perror_plus("fork");

1052

return false;

1053

}

1054

int status;

1055

pid_t pret = -1;

1056

errno = 0;

1057

do {

1058

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

1059

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

1060

int errno_raising = 0;

1061

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

1062

errno_raising = errno;

1063

perror_plus("Failed to raise privileges in order to"

1064

" kill helper program");

1065

}

1066

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

1067

perror_plus("kill");

1068

}

1069

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

1070

perror_plus("Failed to lower privileges after killing"

1071

" helper program");

1072

}

1073

return false;

1074

}

1075

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

1076

if(pret == -1){

1077

perror_plus("waitpid");

1078

return false;

1079

}

1080

if(WIFEXITED(status)){

1081

if(WEXITSTATUS(status) != 0){

1082

fprintf_plus(stderr, "Error: iprouteadddel exited"

1083

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

1084

return false;

1085

}

1086

return true;

1087

}

1088

if(WIFSIGNALED(status)){

1089

fprintf_plus(stderr, "Error: iprouteadddel died by"

1090

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

1091

return false;

1092

}

1093

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

1094

return false;

1095

}

1096

1097

__attribute__((nonnull, warn_unused_result))

1098

static bool add_local_route(const char *address,

1099

AvahiIfIndex if_index){

1100

if(debug){

1101

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

1102

}

1103

return add_delete_local_route(true, address, if_index);

1104

}

1105

1106

__attribute__((nonnull, warn_unused_result))

1107

static bool delete_local_route(const char *address,

1108

AvahiIfIndex if_index){

1109

if(debug){

1110

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

1111

}

1112

return add_delete_local_route(false, address, if_index);

1113

}

1114

628

1115

/* Called when a Mandos server is found */

1116

__attribute__((nonnull, warn_unused_result))

629

1117

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

630

1118

AvahiIfIndex if_index,

631

1119

int af, mandos_context *mc){

632

1120

int ret, tcp_sd = -1;

633

1121

ssize_t sret;

634

union {

635

struct sockaddr_in in;

636

struct sockaddr_in6 in6;

637

} to;

1122

struct sockaddr_storage to;

638

1123

char *buffer = NULL;

639

1124

char *decrypted_buffer = NULL;

640

1125

size_t buffer_length = 0;

643

1128

int retval = -1;

644

1129

gnutls_session_t session;

645

1130

int pf; /* Protocol family */

1131

bool route_added = false;

646

1132

647

1133

errno = 0;

648

1134

670

1156

bool match = false;

671

1157

{

672

1158

char *interface = NULL;

673

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

674

interface))){

1159

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

1160

mc->interfaces_size,

1161

interface))){

675

1162

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

676

1163

match = true;

677

1164

break;

706

1193

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

707

1194

}

708

1195

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

1196

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

710

1197

if(tcp_sd < 0){

711

1198

int e = errno;

712

1199

perror_plus("socket");

719

1206

goto mandos_end;

720

1207

}

721

1208

722

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

723

1209

if(af == AF_INET6){

724

to.in6.sin6_family = (sa_family_t)af;

725

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

1210

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

1211

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

1212

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

726

1213

} else { /* IPv4 */

727

to.in.sin_family = (sa_family_t)af;

728

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

1214

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

1215

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

1216

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

729

1217

}

730

1218

if(ret < 0 ){

731

1219

int e = errno;

740

1228

goto mandos_end;

741

1229

}

742

1230

if(af == AF_INET6){

743

to.in6.sin6_port = htons(port);

744

#ifdef __GNUC__

745

#pragma GCC diagnostic push

746

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

747

#endif

748

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

749

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

750

#ifdef __GNUC__

751

#pragma GCC diagnostic pop

752

#endif

1231

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

1232

if(IN6_IS_ADDR_LINKLOCAL

1233

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

753

1234

if(if_index == AVAHI_IF_UNSPEC){

754

1235

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

755

1236

" incomplete without a network interface\n");

757

1238

goto mandos_end;

758

1239

}

759

1240

/* Set the network interface number as scope */

760

to.in6.sin6_scope_id = (uint32_t)if_index;

1241

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

761

1242

}

762

1243

} else {

763

to.in.sin_port = htons(port);

1244

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

764

1245

}

765

1246

766

1247

if(quit_now){

783

1264

}

784

1265

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

785

1266

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

786

const char *pcret;

787

if(af == AF_INET6){

788

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

789

sizeof(addrstr));

790

} else {

791

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

792

sizeof(addrstr));

793

}

794

if(pcret == NULL){

795

perror_plus("inet_ntop");

796

} else {

797

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

798

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

799

}

800

}

801

}

802

803

if(quit_now){

804

errno = EINTR;

805

goto mandos_end;

806

}

807

808

if(af == AF_INET6){

809

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

810

} else {

811

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

812

}

813

if(ret < 0){

814

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

815

int e = errno;

816

perror_plus("connect");

817

errno = e;

818

}

819

goto mandos_end;

820

}

821

822

if(quit_now){

823

errno = EINTR;

824

goto mandos_end;

1267

if(af == AF_INET6){

1268

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

1269

sizeof(struct sockaddr_in6),

1270

addrstr, sizeof(addrstr), NULL, 0,

1271

NI_NUMERICHOST);

1272

} else {

1273

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

1274

sizeof(struct sockaddr_in),

1275

addrstr, sizeof(addrstr), NULL, 0,

1276

NI_NUMERICHOST);

1277

}

1278

if(ret == EAI_SYSTEM){

1279

perror_plus("getnameinfo");

1280

} else if(ret != 0) {

1281

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

1282

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

1283

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

1284

}

1285

}

1286

1287

if(quit_now){

1288

errno = EINTR;

1289

goto mandos_end;

1290

}

1291

1292

while(true){

1293

if(af == AF_INET6){

1294

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

1295

sizeof(struct sockaddr_in6));

1296

} else {

1297

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

1298

sizeof(struct sockaddr_in));

1299

}

1300

if(ret < 0){

1301

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

1302

and if_index != AVAHI_IF_UNSPEC

1303

and connect_to == NULL

1304

and not route_added and

1305

((af == AF_INET6 and not

1306

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1307

&to)->sin6_addr)))

1308

or (af == AF_INET and

1309

/* Not a a IPv4LL address */

1310

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

1311

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

1312

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

1313

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

1314

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

1315

connect to a Mandos server announced by Avahi on a server

1316

host with a global address. Work around this by retrying

1317

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

1318

1319

Avahi bug reference:

1320

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

1321

https://bugs.debian.org/587961

1322

*/

1323

if(debug){

1324

fprintf_plus(stderr, "Mandos server unreachable, trying"

1325

" direct route\n");

1326

}

1327

int e = errno;

1328

route_added = add_local_route(ip, if_index);

1329

if(route_added){

1330

continue;

1331

}

1332

errno = e;

1333

}

1334

if(errno != ECONNREFUSED or debug){

1335

int e = errno;

1336

perror_plus("connect");

1337

errno = e;

1338

}

1339

goto mandos_end;

1340

}

1341

1342

if(quit_now){

1343

errno = EINTR;

1344

goto mandos_end;

1345

}

1346

break;

825

1347

}

826

1348

827

1349

const char *out = mandos_protocol_version;

981

1503

&decrypted_buffer, mc);

982

1504

if(decrypted_buffer_size >= 0){

983

1505

1506

clearerr(stdout);

984

1507

written = 0;

985

1508

while(written < (size_t) decrypted_buffer_size){

986

1509

if(quit_now){

1002

1525

}

1003

1526

written += (size_t)ret;

1004

1527

}

1528

ret = fflush(stdout);

1529

if(ret != 0){

1530

int e = errno;

1531

if(debug){

1532

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

1533

strerror(errno));

1534

}

1535

errno = e;

1536

goto mandos_end;

1537

}

1005

1538

retval = 0;

1006

1539

}

1007

1540

}

1010

1543

1011

1544

mandos_end:

1012

1545

{

1546

if(route_added){

1547

if(not delete_local_route(ip, if_index)){

1548

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

1549

" interface %d", ip, if_index);

1550

}

1551

}

1013

1552

int e = errno;

1014

1553

free(decrypted_buffer);

1015

1554

free(buffer);

1016

1555

if(tcp_sd >= 0){

1017

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

1556

ret = close(tcp_sd);

1018

1557

}

1019

1558

if(ret == -1){

1020

1559

if(e == 0){

1045

1584

AVAHI_GCC_UNUSED AvahiStringList *txt,

1046

1585

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1047

1586

flags,

1048

void* mc){

1587

void *mc){

1049

1588

if(r == NULL){

1050

1589

return;

1051

1590

}

1054

1593

timed out */

1055

1594

1056

1595

if(quit_now){

1596

avahi_s_service_resolver_free(r);

1057

1597

return;

1058

1598

}

1059

1599

1104

1644

const char *domain,

1105

1645

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1106

1646

flags,

1107

void* mc){

1647

void *mc){

1108

1648

if(b == NULL){

1109

1649

return;

1110

1650

}

1170

1710

errno = old_errno;

1171

1711

}

1172

1712

1713

__attribute__((nonnull, warn_unused_result))

1173

1714

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

1174

1715

int ret;

1175

error_t ret_errno;

1716

int old_errno;

1176

1717

1177

1718

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

1178

1719

if(s < 0){

1179

ret_errno = errno;

1720

old_errno = errno;

1180

1721

perror_plus("socket");

1181

errno = ret_errno;

1722

errno = old_errno;

1182

1723

return false;

1183

1724

}

1184

strcpy(ifr->ifr_name, ifname);

1725

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1726

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1185

1727

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1186

1728

if(ret == -1){

1187

1729

if(debug){

1188

ret_errno = errno;

1730

old_errno = errno;

1189

1731

perror_plus("ioctl SIOCGIFFLAGS");

1190

errno = ret_errno;

1732

errno = old_errno;

1733

}

1734

if((close(s) == -1) and debug){

1735

old_errno = errno;

1736

perror_plus("close");

1737

errno = old_errno;

1191

1738

}

1192

1739

return false;

1193

1740

}

1741

if((close(s) == -1) and debug){

1742

old_errno = errno;

1743

perror_plus("close");

1744

errno = old_errno;

1745

}

1194

1746

return true;

1195

1747

}

1196

1748

1749

__attribute__((nonnull, warn_unused_result))

1197

1750

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

1198

1751

1199

1752

/* Reject the loopback device */

1241

1794

* corresponds to an acceptable network device.

1242

1795

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

1243

1796

*/

1797

__attribute__((nonnull, warn_unused_result))

1244

1798

int good_interface(const struct dirent *if_entry){

1245

1799

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

1246

1800

return 0;

1264

1818

/*

1265

1819

* This function determines if a network interface is up.

1266

1820

*/

1821

__attribute__((nonnull, warn_unused_result))

1267

1822

bool interface_is_up(const char *interface){

1268

1823

struct ifreq ifr;

1269

1824

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

1280

1835

/*

1281

1836

* This function determines if a network interface is running

1282

1837

*/

1838

__attribute__((nonnull, warn_unused_result))

1283

1839

bool interface_is_running(const char *interface){

1284

1840

struct ifreq ifr;

1285

1841

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

1293

1849

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

1294

1850

}

1295

1851

1852

__attribute__((nonnull, pure, warn_unused_result))

1296

1853

int notdotentries(const struct dirent *direntry){

1297

1854

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

1298

1855

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

1305

1862

}

1306

1863

1307

1864

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

1865

__attribute__((nonnull, warn_unused_result))

1308

1866

int runnable_hook(const struct dirent *direntry){

1309

1867

int ret;

1310

1868

size_t sret;

1318

1876

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

1319

1877

"abcdefghijklmnopqrstuvwxyz"

1320

1878

"0123456789"

1321

"_-");

1879

"_.-");

1322

1880

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

1323

1881

/* Contains non-allowed characters */

1324

1882

if(debug){

1328

1886

return 0;

1329

1887

}

1330

1888

1331

char *fullname = NULL;

1332

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

1333

if(ret < 0){

1334

perror_plus("asprintf");

1335

return 0;

1336

}

1337

1338

ret = stat(fullname, &st);

1889

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

1339

1890

if(ret == -1){

1340

1891

if(debug){

1341

1892

perror_plus("Could not stat hook");

1365

1916

return 1;

1366

1917

}

1367

1918

1919

__attribute__((nonnull, warn_unused_result))

1368

1920

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1369

1921

mandos_context *mc){

1370

1922

int ret;

1374

1926

1375

1927

while(true){

1376

1928

if(mc->current_server == NULL){

1377

if (debug){

1929

if(debug){

1378

1930

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

1379

1931

" No timeout!\n");

1380

1932

}

1381

1933

ret = avahi_simple_poll_iterate(s, -1);

1382

1934

} else {

1383

if (debug){

1935

if(debug){

1384

1936

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

1385

1937

" it, or wait\n");

1386

1938

}

1403

1955

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

1404

1956

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

1405

1957

1406

if (debug){

1958

if(debug){

1407

1959

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

1408

1960

block_time);

1409

1961

}

1431

1983

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

1432

1984

}

1433

1985

if(ret != 0){

1434

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

1986

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

1435

1987

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

1436

1988

}

1437

1989

}

1438

1990

}

1439

1991

}

1440

1992

1441

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

1442

error_t raise_privileges(void){

1443

error_t old_errno = errno;

1444

error_t ret_errno = 0;

1445

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

1446

ret_errno = errno;

1447

perror_plus("seteuid");

1448

}

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

1453

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

1454

error_t raise_privileges_permanently(void){

1455

error_t old_errno = errno;

1456

error_t ret_errno = raise_privileges();

1457

if(ret_errno != 0){

1458

errno = old_errno;

1459

return ret_errno;

1460

}

1461

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

1462

ret_errno = errno;

1463

perror_plus("seteuid");

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

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

1470

error_t lower_privileges(void){

1471

error_t old_errno = errno;

1472

error_t ret_errno = 0;

1473

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

1474

ret_errno = errno;

1475

perror_plus("seteuid");

1476

}

1477

errno = old_errno;

1478

return ret_errno;

1479

}

1480

1481

/* Lower privileges permanently */

1482

error_t lower_privileges_permanently(void){

1483

error_t old_errno = errno;

1484

error_t ret_errno = 0;

1485

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

1486

ret_errno = errno;

1487

perror_plus("setuid");

1488

}

1489

errno = old_errno;

1490

return ret_errno;

1491

}

1492

1493

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

1993

__attribute__((nonnull))

1994

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

1494

1995

const float delay){

1495

struct dirent **direntries;

1496

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

1497

alphasort);

1996

struct dirent **direntries = NULL;

1997

if(hookdir_fd == -1){

1998

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1999

| O_CLOEXEC);

2000

if(hookdir_fd == -1){

2001

if(errno == ENOENT){

2002

if(debug){

2003

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

2004

" found\n", hookdir);

2005

}

2006

} else {

2007

perror_plus("open");

2008

}

2009

return;

2010

}

2011

}

2012

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

2013

if(devnull == -1){

2014

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

2015

return;

2016

}

2017

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

2018

runnable_hook, alphasort);

1498

2019

if(numhooks == -1){

1499

if(errno == ENOENT){

1500

if(debug){

1501

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

1502

" found\n", hookdir);

1503

}

1504

} else {

1505

perror_plus("scandir");

2020

perror_plus("scandir");

2021

close(devnull);

2022

return;

2023

}

2024

struct dirent *direntry;

2025

int ret;

2026

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

2027

direntry = direntries[i];

2028

if(debug){

2029

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

2030

direntry->d_name);

1506

2031

}

1507

} else {

1508

struct dirent *direntry;

1509

int ret;

1510

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

1511

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

1512

direntry = direntries[i];

1513

char *fullname = NULL;

1514

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

1515

if(ret < 0){

2032

pid_t hook_pid = fork();

2033

if(hook_pid == 0){

2034

/* Child */

2035

/* Raise privileges */

2036

errno = raise_privileges_permanently();

2037

if(errno != 0){

2038

perror_plus("Failed to raise privileges");

2039

_exit(EX_NOPERM);

2040

}

2041

/* Set group */

2042

errno = 0;

2043

ret = setgid(0);

2044

if(ret == -1){

2045

perror_plus("setgid");

2046

_exit(EX_NOPERM);

2047

}

2048

/* Reset supplementary groups */

2049

errno = 0;

2050

ret = setgroups(0, NULL);

2051

if(ret == -1){

2052

perror_plus("setgroups");

2053

_exit(EX_NOPERM);

2054

}

2055

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

2056

if(ret == -1){

2057

perror_plus("setenv");

2058

_exit(EX_OSERR);

2059

}

2060

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

2061

if(ret == -1){

2062

perror_plus("setenv");

2063

_exit(EX_OSERR);

2064

}

2065

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

2066

if(ret == -1){

2067

perror_plus("setenv");

2068

_exit(EX_OSERR);

2069

}

2070

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

2071

if(ret == -1){

2072

perror_plus("setenv");

2073

_exit(EX_OSERR);

2074

}

2075

char *delaystring;

2076

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

2077

if(ret == -1){

1516

2078

perror_plus("asprintf");

1517

continue;

1518

}

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

pid_t hook_pid = fork();

1524

if(hook_pid == 0){

1525

/* Child */

1526

/* Raise privileges */

1527

raise_privileges_permanently();

1528

/* Set group */

1529

errno = 0;

1530

ret = setgid(0);

1531

if(ret == -1){

1532

perror_plus("setgid");

1533

}

1534

/* Reset supplementary groups */

1535

errno = 0;

1536

ret = setgroups(0, NULL);

1537

if(ret == -1){

1538

perror_plus("setgroups");

1539

}

1540

dup2(devnull, STDIN_FILENO);

1541

close(devnull);

1542

dup2(STDERR_FILENO, STDOUT_FILENO);

1543

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

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

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

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

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

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

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

1559

if(ret == -1){

1560

perror_plus("setenv");

1561

_exit(EX_OSERR);

1562

}

1563

char *delaystring;

1564

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

1565

if(ret == -1){

1566

perror_plus("asprintf");

1567

_exit(EX_OSERR);

1568

}

1569

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

1570

if(ret == -1){

1571

free(delaystring);

1572

perror_plus("setenv");

1573

_exit(EX_OSERR);

1574

}

2079

_exit(EX_OSERR);

2080

}

2081

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

2082

if(ret == -1){

1575

2083

free(delaystring);

1576

if(connect_to != NULL){

1577

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

1578

if(ret == -1){

1579

perror_plus("setenv");

1580

_exit(EX_OSERR);

1581

}

1582

}

1583

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1584

perror_plus("execl");

1585

_exit(EXIT_FAILURE);

1586

}

2084

perror_plus("setenv");

2085

_exit(EX_OSERR);

2086

}

2087

free(delaystring);

2088

if(connect_to != NULL){

2089

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

2090

if(ret == -1){

2091

perror_plus("setenv");

2092

_exit(EX_OSERR);

2093

}

2094

}

2095

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

2096

direntry->d_name,

2097

O_RDONLY));

2098

if(hook_fd == -1){

2099

perror_plus("openat");

2100

_exit(EXIT_FAILURE);

2101

}

2102

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

2103

perror_plus("close");

2104

_exit(EXIT_FAILURE);

2105

}

2106

ret = dup2(devnull, STDIN_FILENO);

2107

if(ret == -1){

2108

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

2109

_exit(EX_OSERR);

2110

}

2111

ret = close(devnull);

2112

if(ret == -1){

2113

perror_plus("close");

2114

_exit(EX_OSERR);

2115

}

2116

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2117

if(ret == -1){

2118

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

2119

_exit(EX_OSERR);

2120

}

2121

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

2122

environ) == -1){

2123

perror_plus("fexecve");

2124

_exit(EXIT_FAILURE);

2125

}

2126

} else {

2127

if(hook_pid == -1){

2128

perror_plus("fork");

2129

free(direntry);

2130

continue;

2131

}

2132

int status;

2133

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

2134

perror_plus("waitpid");

2135

free(direntry);

2136

continue;

2137

}

2138

if(WIFEXITED(status)){

2139

if(WEXITSTATUS(status) != 0){

2140

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

2141

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

2142

WEXITSTATUS(status));

2143

free(direntry);

2144

continue;

2145

}

2146

} else if(WIFSIGNALED(status)){

2147

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

2148

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

2149

WTERMSIG(status));

2150

free(direntry);

2151

continue;

1587

2152

} else {

1588

int status;

1589

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

1590

perror_plus("waitpid");

1591

free(fullname);

1592

continue;

1593

}

1594

if(WIFEXITED(status)){

1595

if(WEXITSTATUS(status) != 0){

1596

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

1597

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

1598

WEXITSTATUS(status));

1599

free(fullname);

1600

continue;

1601

}

1602

} else if(WIFSIGNALED(status)){

1603

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

1604

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

1605

WTERMSIG(status));

1606

free(fullname);

1607

continue;

1608

} else {

1609

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

1610

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

1611

free(fullname);

1612

continue;

1613

}

1614

}

1615

free(fullname);

1616

if(debug){

1617

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

1618

direntry->d_name);

1619

}

1620

}

1621

close(devnull);

1622

}

1623

return true;

2153

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

2154

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

2155

free(direntry);

2156

continue;

2157

}

2158

}

2159

if(debug){

2160

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

2161

direntry->d_name);

2162

}

2163

free(direntry);

2164

}

2165

free(direntries);

2166

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

2167

perror_plus("close");

2168

} else {

2169

hookdir_fd = -1;

2170

}

2171

close(devnull);

1624

2172

}

1625

2173

1626

error_t bring_up_interface(const char *const interface,

1627

const float delay){

1628

int sd = -1;

1629

error_t old_errno = errno;

1630

error_t ret_errno = 0;

1631

int ret, ret_setflags;

2174

__attribute__((nonnull, warn_unused_result))

2175

int bring_up_interface(const char *const interface,

2176

const float delay){

2177

int old_errno = errno;

2178

int ret;

1632

2179

struct ifreq network;

1633

2180

unsigned int if_index = if_nametoindex(interface);

1634

2181

if(if_index == 0){

1643

2190

}

1644

2191

1645

2192

if(not interface_is_up(interface)){

1646

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

2193

int ret_errno = 0;

2194

int ioctl_errno = 0;

2195

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

1647

2196

ret_errno = errno;

1648

2197

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

1649

2198

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

2199

errno = old_errno;

1650

2200

return ret_errno;

1651

2201

}

1652

network.ifr_flags |= IFF_UP;

2202

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

1653

2203

1654

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1655

if(sd < 0){

2204

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

2205

if(sd == -1){

1656

2206

ret_errno = errno;

1657

2207

perror_plus("socket");

1658

2208

errno = old_errno;

1659

2209

return ret_errno;

1660

2210

}

1661

2211

1662

2212

if(quit_now){

1663

close(sd);

2213

ret = close(sd);

2214

if(ret == -1){

2215

perror_plus("close");

2216

}

1664

2217

errno = old_errno;

1665

2218

return EINTR;

1666

2219

}

1670

2223

interface);

1671

2224

}

1672

2225

1673

/* Raise priviliges */

1674

raise_privileges();

2226

/* Raise privileges */

2227

ret_errno = raise_privileges();

2228

if(ret_errno != 0){

2229

errno = ret_errno;

2230

perror_plus("Failed to raise privileges");

2231

}

1675

2232

1676

2233

#ifdef __linux__

1677

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1678

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

1679

int ret_linux = klogctl(8, NULL, 5);

1680

bool restore_loglevel = true;

1681

if(ret_linux == -1){

1682

restore_loglevel = false;

1683

perror_plus("klogctl");

2234

int ret_linux;

2235

bool restore_loglevel = false;

2236

if(ret_errno == 0){

2237

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2238

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

2239

ret_linux = klogctl(8, NULL, 5);

2240

if(ret_linux == -1){

2241

perror_plus("klogctl");

2242

} else {

2243

restore_loglevel = true;

2244

}

1684

2245

}

1685

2246

#endif /* __linux__ */

1686

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

1687

ret_errno = errno;

2247

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

2248

ioctl_errno = errno;

1688

2249

#ifdef __linux__

1689

2250

if(restore_loglevel){

1690

2251

ret_linux = klogctl(7, NULL, 0);

1694

2255

}

1695

2256

#endif /* __linux__ */

1696

2257

1697

/* Lower privileges */

1698

lower_privileges();

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

}

1699

2267

1700

2268

/* Close the socket */

1701

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

2269

ret = close(sd);

1702

2270

if(ret == -1){

1703

2271

perror_plus("close");

1704

2272

}

1705

2273

1706

2274

if(ret_setflags == -1){

1707

errno = ret_errno;

2275

errno = ioctl_errno;

1708

2276

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1709

2277

errno = old_errno;

1710

return ret_errno;

2278

return ioctl_errno;

1711

2279

}

1712

2280

} else if(debug){

1713

2281

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

1716

2284

1717

2285

/* Sleep checking until interface is running.

1718

2286

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

1719

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

2287

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

1720

2288

if(interface_is_running(interface)){

1721

2289

break;

1722

2290

}

1731

2299

return 0;

1732

2300

}

1733

2301

1734

error_t take_down_interface(const char *const interface){

1735

error_t old_errno = errno;

2302

__attribute__((nonnull, warn_unused_result))

2303

int take_down_interface(const char *const interface){

2304

int old_errno = errno;

1736

2305

struct ifreq network;

1737

2306

unsigned int if_index = if_nametoindex(interface);

1738

2307

if(if_index == 0){

1741

2310

return ENXIO;

1742

2311

}

1743

2312

if(interface_is_up(interface)){

1744

error_t ret_errno = 0;

2313

int ret_errno = 0;

2314

int ioctl_errno = 0;

1745

2315

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

1746

2316

ret_errno = errno;

1747

2317

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

1748

2318

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

2319

errno = old_errno;

1749

2320

return ret_errno;

1750

2321

}

1751

2322

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

1752

2323

1753

2324

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

1754

if(sd < 0){

2325

if(sd == -1){

1755

2326

ret_errno = errno;

1756

2327

perror_plus("socket");

1757

2328

errno = old_errno;

1763

2334

interface);

1764

2335

}

1765

2336

1766

/* Raise priviliges */

1767

raise_privileges();

2337

/* Raise privileges */

2338

ret_errno = raise_privileges();

2339

if(ret_errno != 0){

2340

errno = ret_errno;

2341

perror_plus("Failed to raise privileges");

2342

}

1768

2343

1769

2344

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

1770

ret_errno = errno;

2345

ioctl_errno = errno;

1771

2346

1772

/* Lower privileges */

1773

lower_privileges();

2347

/* If raise_privileges() succeeded above */

2348

if(ret_errno == 0){

2349

/* Lower privileges */

2350

ret_errno = lower_privileges();

2351

if(ret_errno != 0){

2352

errno = ret_errno;

2353

perror_plus("Failed to lower privileges");

2354

}

2355

}

1774

2356

1775

2357

/* Close the socket */

1776

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

2358

int ret = close(sd);

1777

2359

if(ret == -1){

1778

2360

perror_plus("close");

1779

2361

}

1780

2362

1781

2363

if(ret_setflags == -1){

1782

errno = ret_errno;

2364

errno = ioctl_errno;

1783

2365

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1784

2366

errno = old_errno;

1785

return ret_errno;

2367

return ioctl_errno;

1786

2368

}

1787

2369

} else if(debug){

1788

2370

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

1794

2376

}

1795

2377

1796

2378

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

1797

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

1798

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

1799

"+CTYPE-OPENPGP", .current_server = NULL,

1800

.interfaces = NULL, .interfaces_size = 0 };

2379

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

2380

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

2381

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

2382

.current_server = NULL, .interfaces = NULL,

2383

.interfaces_size = 0 };

1801

2384

AvahiSServiceBrowser *sb = NULL;

1802

2385

error_t ret_errno;

1803

2386

int ret;

1806

2389

int exitcode = EXIT_SUCCESS;

1807

2390

char *interfaces_to_take_down = NULL;

1808

2391

size_t interfaces_to_take_down_size = 0;

1809

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

1810

bool tempdir_created = false;

2392

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

2393

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

2394

char *tempdir = NULL;

1811

2395

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1812

2396

const char *seckey = PATHDIR "/" SECKEY;

1813

2397

const char *pubkey = PATHDIR "/" PUBKEY;

2398

const char *dh_params_file = NULL;

1814

2399

char *interfaces_hooks = NULL;

1815

2400

1816

2401

bool gnutls_initialized = false;

1869

2454

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

1870

2455

" Diffie-Hellman key exchange",

1871

2456

.group = 2 },

2457

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

2458

.arg = "FILE",

2459

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

2460

" for the Diffie-Hellman key exchange",

2461

.group = 2 },

1872

2462

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

1873

2463

.arg = "STRING",

1874

2464

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

1929

2519

}

1930

2520

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

1931

2521

break;

2522

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

2523

dh_params_file = arg;

2524

break;

1932

2525

case 130: /* --priority */

1933

2526

mc.priority = arg;

1934

2527

break;

1974

2567

.args_doc = "",

1975

2568

.doc = "Mandos client -- Get and decrypt"

1976

2569

" passwords from a Mandos server" };

1977

ret = argp_parse(&argp, argc, argv,

1978

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1979

switch(ret){

2570

ret_errno = argp_parse(&argp, argc, argv,

2571

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2572

switch(ret_errno){

1980

2573

case 0:

1981

2574

break;

1982

2575

case ENOMEM:

1983

2576

default:

1984

errno = ret;

2577

errno = ret_errno;

1985

2578

perror_plus("argp_parse");

1986

2579

exitcode = EX_OSERR;

1987

2580

goto end;

1990

2583

goto end;

1991

2584

}

1992

2585

}

1993

2586

1994

2587

{

1995

2588

/* Work around Debian bug #633582:

1996

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

2589

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

1997

2590

1998

/* Re-raise priviliges */

1999

if(raise_privileges() == 0){

2591

/* Re-raise privileges */

2592

ret = raise_privileges();

2593

if(ret != 0){

2594

errno = ret;

2595

perror_plus("Failed to raise privileges");

2596

} else {

2000

2597

struct stat st;

2001

2598

2002

2599

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

2016

2613

}

2017

2614

}

2018

2615

}

2019

TEMP_FAILURE_RETRY(close(seckey_fd));

2616

close(seckey_fd);

2020

2617

}

2021

2618

}

2022

2619

2023

2620

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

2024

2621

int pubkey_fd = open(pubkey, O_RDONLY);

2025

2622

if(pubkey_fd == -1){

2037

2634

}

2038

2635

}

2039

2636

}

2040

TEMP_FAILURE_RETRY(close(pubkey_fd));

2041

}

2042

}

2043

2637

close(pubkey_fd);

2638

}

2639

}

2640

2641

if(dh_params_file != NULL

2642

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

2643

int dhparams_fd = open(dh_params_file, O_RDONLY);

2644

if(dhparams_fd == -1){

2645

perror_plus("open");

2646

} else {

2647

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

2648

if(ret == -1){

2649

perror_plus("fstat");

2650

} else {

2651

if(S_ISREG(st.st_mode)

2652

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

2653

ret = fchown(dhparams_fd, uid, gid);

2654

if(ret == -1){

2655

perror_plus("fchown");

2656

}

2657

}

2658

}

2659

close(dhparams_fd);

2660

}

2661

}

2662

2044

2663

/* Lower privileges */

2045

lower_privileges();

2664

ret = lower_privileges();

2665

if(ret != 0){

2666

errno = ret;

2667

perror_plus("Failed to lower privileges");

2668

}

2046

2669

}

2047

2670

}

2048

2671

2074

2697

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

2075

2698

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

2076

2699

}

2077

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2700

run_network_hooks("start", interfaces_hooks != NULL ?

2701

interfaces_hooks : "", delay);

2081

2702

}

2082

2703

2083

2704

if(not debug){

2161

2782

2162

2783

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

2163

2784

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2785

struct dirent **direntries = NULL;

2165

2786

/* Look for any good interfaces */

2166

2787

ret = scandir(sys_class_net, &direntries, good_interface,

2167

2788

alphasort);

2173

2794

if(ret_errno != 0){

2174

2795

errno = ret_errno;

2175

2796

perror_plus("argz_add");

2797

free(direntries[i]);

2176

2798

continue;

2177

2799

}

2178

2800

if(debug){

2179

2801

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

2180

2802

direntries[i]->d_name);

2181

2803

}

2804

free(direntries[i]);

2182

2805

}

2183

2806

free(direntries);

2184

2807

} else {

2185

free(direntries);

2808

if(ret == 0){

2809

free(direntries);

2810

}

2186

2811

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

2187

2812

exitcode = EXIT_FAILURE;

2188

2813

goto end;

2211

2836

break;

2212

2837

}

2213

2838

bool interface_was_up = interface_is_up(interface);

2214

ret = bring_up_interface(interface, delay);

2839

errno = bring_up_interface(interface, delay);

2215

2840

if(not interface_was_up){

2216

if(ret != 0){

2217

errno = ret;

2218

perror_plus("Failed to bring up interface");

2841

if(errno != 0){

2842

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

2843

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

2219

2844

} else {

2220

ret_errno = argz_add(&interfaces_to_take_down,

2221

&interfaces_to_take_down_size,

2222

interface);

2223

if(ret_errno != 0){

2224

errno = ret_errno;

2845

errno = argz_add(&interfaces_to_take_down,

2846

&interfaces_to_take_down_size,

2847

interface);

2848

if(errno != 0){

2225

2849

perror_plus("argz_add");

2226

2850

}

2227

2851

}

2245

2869

goto end;

2246

2870

}

2247

2871

2248

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

2872

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

2249

2873

if(ret == -1){

2250

2874

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

2251

2875

exitcode = EX_UNAVAILABLE;

2258

2882

goto end;

2259

2883

}

2260

2884

2261

if(mkdtemp(tempdir) == NULL){

2885

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

2886

tempdir = mkdtemp(run_tempdir);

2887

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

2888

if(debug){

2889

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

2890

run_tempdir, old_tempdir);

2891

}

2892

tempdir = mkdtemp(old_tempdir);

2893

}

2894

if(tempdir == NULL){

2262

2895

perror_plus("mkdtemp");

2263

2896

goto end;

2264

2897

}

2265

tempdir_created = true;

2266

2898

2267

2899

if(quit_now){

2268

2900

goto end;

2343

2975

sleep((unsigned int)retry_interval);

2344

2976

}

2345

2977

2346

if (not quit_now){

2978

if(not quit_now){

2347

2979

exitcode = EXIT_SUCCESS;

2348

2980

}

2349

2981

2365

2997

2366

2998

/* Allocate a new server */

2367

2999

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2368

&config, NULL, NULL, &ret_errno);

3000

&config, NULL, NULL, &ret);

2369

3001

2370

3002

/* Free the Avahi configuration data */

2371

3003

avahi_server_config_free(&config);

2374

3006

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

2375

3007

if(mc.server == NULL){

2376

3008

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

2377

avahi_strerror(ret_errno));

3009

avahi_strerror(ret));

2378

3010

exitcode = EX_UNAVAILABLE;

2379

3011

goto end;

2380

3012

}

2404

3036

if(debug){

2405

3037

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

2406

3038

}

2407

3039

2408

3040

ret = avahi_loop_with_timeout(simple_poll,

2409

3041

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

2410

3042

if(debug){

2415

3047

end:

2416

3048

2417

3049

if(debug){

2418

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

3050

if(signal_received){

3051

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

3052

argv[0], signal_received,

3053

strsignal(signal_received));

3054

} else {

3055

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

3056

}

2419

3057

}

2420

3058

2421

3059

/* Cleanup things */

2432

3070

2433

3071

if(gnutls_initialized){

2434

3072

gnutls_certificate_free_credentials(mc.cred);

2435

gnutls_global_deinit();

2436

3073

gnutls_dh_params_deinit(mc.dh_params);

2437

3074

}

2438

3075

2446

3083

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

2447

3084

while(mc.current_server != NULL){

2448

3085

server *next = mc.current_server->next;

3086

#ifdef __GNUC__

3087

#pragma GCC diagnostic push

3088

#pragma GCC diagnostic ignored "-Wcast-qual"

3089

#endif

3090

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

3091

#ifdef __GNUC__

3092

#pragma GCC diagnostic pop

3093

#endif

2449

3094

free(mc.current_server);

2450

3095

mc.current_server = next;

2451

3096

}

2452

3097

}

2453

3098

2454

/* Re-raise priviliges */

3099

/* Re-raise privileges */

2455

3100

{

2456

raise_privileges();

2457

2458

/* Run network hooks */

2459

run_network_hooks("stop", interfaces_hooks != NULL ?

2460

interfaces_hooks : "", delay);

2461

2462

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

2463

{

2464

char *interface = NULL;

2465

while((interface=argz_next(interfaces_to_take_down,

2466

interfaces_to_take_down_size,

2467

interface))){

2468

ret_errno = take_down_interface(interface);

2469

if(ret_errno != 0){

2470

errno = ret_errno;

2471

perror_plus("Failed to take down interface");

2472

}

2473

}

2474

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

2475

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

2476

" down\n");

2477

}

2478

}

2479

2480

lower_privileges_permanently();

3101

ret = raise_privileges();

3102

if(ret != 0){

3103

errno = ret;

3104

perror_plus("Failed to raise privileges");

3105

} else {

3106

3107

/* Run network hooks */

3108

run_network_hooks("stop", interfaces_hooks != NULL ?

3109

interfaces_hooks : "", delay);

3110

3111

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

3112

{

3113

char *interface = NULL;

3114

while((interface = argz_next(interfaces_to_take_down,

3115

interfaces_to_take_down_size,

3116

interface))){

3117

ret = take_down_interface(interface);

3118

if(ret != 0){

3119

errno = ret;

3120

perror_plus("Failed to take down interface");

3121

}

3122

}

3123

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

3124

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

3125

" down\n");

3126

}

3127

}

3128

}

3129

3130

ret = lower_privileges_permanently();

3131

if(ret != 0){

3132

errno = ret;

3133

perror_plus("Failed to lower privileges permanently");

3134

}

2481

3135

}

2482

3136

2483

3137

free(interfaces_to_take_down);

2484

3138

free(interfaces_hooks);

2485

3139

3140

void clean_dir_at(int base, const char * const dirname,

3141

uintmax_t level){

3142

struct dirent **direntries = NULL;

3143

int dret;

3144

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3145

O_RDONLY

3146

| O_NOFOLLOW

3147

| O_DIRECTORY

3148

| O_PATH));

3149

if(dir_fd == -1){

3150

perror_plus("open");

3151

return;

3152

}

3153

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

3154

notdotentries, alphasort);

3155

if(numentries >= 0){

3156

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

3157

if(debug){

3158

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3159

dirname, direntries[i]->d_name);

3160

}

3161

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3162

if(dret == -1){

3163

if(errno == EISDIR){

3164

dret = unlinkat(dir_fd, direntries[i]->d_name,

3165

AT_REMOVEDIR);

3166

}

3167

if((dret == -1) and (errno == ENOTEMPTY)

3168

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3169

== 0) and (level == 0)){

3170

/* Recurse only in this special case */

3171

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3172

dret = 0;

3173

}

3174

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

3175

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3176

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

3177

}

3178

}

3179

free(direntries[i]);

3180

}

3181

3182

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

3183

free(direntries);

3184

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3185

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

3186

perror_plus("rmdir");

3187

}

3188

} else {

3189

perror_plus("scandirat");

3190

}

3191

close(dir_fd);

3192

}

3193

2486

3194

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

2487

if(tempdir_created){

2488

struct dirent **direntries = NULL;

2489

struct dirent *direntry = NULL;

2490

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

2491

alphasort);

2492

if (numentries > 0){

2493

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

2494

direntry = direntries[i];

2495

char *fullname = NULL;

2496

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

2497

direntry->d_name);

2498

if(ret < 0){

2499

perror_plus("asprintf");

2500

continue;

2501

}

2502

ret = remove(fullname);

2503

if(ret == -1){

2504

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

2505

strerror(errno));

2506

}

2507

free(fullname);

2508

}

2509

}

2510

2511

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

2512

free(direntries);

2513

if (numentries == -1){

2514

perror_plus("scandir");

2515

}

2516

ret = rmdir(tempdir);

2517

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

2518

perror_plus("rmdir");

2519

}

3195

if(tempdir != NULL){

3196

clean_dir_at(-1, tempdir, 0);

2520

3197

}

2521

3198

2522

3199

if(quit_now){