/mandos/trunk : revision 666

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

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*

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* Everything else is

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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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*

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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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21

* WITHOUT ANY WARRANTY; without even the implied warranty of

24

22

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

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23

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

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* along with this program. If not, see

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

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*

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

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*/

33

32

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

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33

#ifndef _LARGEFILE_SOURCE

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34

#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

35

#endif

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36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

39

#endif /* not _FILE_OFFSET_BITS */

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#endif

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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() */

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stdout, ferror(), remove() */

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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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48

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

50

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

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asprintf(), strncpy(), strsignal()

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*/

49

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

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

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51

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

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52

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

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sockaddr_in6, PF_INET6,

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55

opendir(), DIR */

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56

#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(),

61

getnameinfo() */

62

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

58

inet_pton(), connect() */

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

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

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61

*/

65

62

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

66

63

strtoimax() */

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

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65

program_invocation_short_name */

73

66

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

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67

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

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72

*/

80

73

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

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74

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

82

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

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unlinkat() */

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

75

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

76

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

85

77

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

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78

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

87

79

argp_state, struct argp,

99

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

102

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

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EAI_SYSTEM, gai_strerror() */

104

94

105

95

#ifdef __linux__

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

148

138

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

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139

char *connect_to = NULL;

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const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

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141

uid_t uid = 65534;

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gid_t gid = 65534;

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143

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perror(print_text);

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}

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182

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

183

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

195

184

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

196

185

va_list ap;

197

186

va_start (ap, format);

206

195

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

207

196

* "buffer_length" is how much is already used.

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197

*/

209

__attribute__((nonnull, warn_unused_result))

210

198

size_t incbuffer(char **buffer, size_t buffer_length,

211

199

size_t buffer_capacity){

212

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

225

213

}

226

214

227

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

228

__attribute__((nonnull, warn_unused_result))

229

216

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

230

217

int af, server **current_server){

231

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int ret;

240

227

.af = af };

241

228

if(new_server->ip == NULL){

242

229

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

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#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

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

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

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#endif

257

free(new_server);

258

230

return false;

259

231

}

260

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/* Special case of first server */

262

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new_server->next = new_server;

263

235

new_server->prev = new_server;

264

236

*current_server = new_server;

237

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

265

238

} else {

266

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

267

239

new_server->next = *current_server;

268

240

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

269

241

new_server->prev->next = new_server;

270

242

(*current_server)->prev = new_server;

271

243

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

return false;

248

}

272

249

return true;

273

250

}

274

251

275

252

/*

276

253

* Initialize GPGME.

277

254

*/

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){

255

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

256

const char *tempdir, mandos_context *mc){

283

257

gpgme_error_t rc;

284

258

gpgme_engine_info_t engine_info;

285

259

286

260

/*

287

261

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

288

262

*/

289

bool import_key(const char * const filename){

263

bool import_key(const char *filename){

290

264

int ret;

291

265

int fd;

292

266

gpgme_data_t pgp_data;

310

284

gpgme_strsource(rc), gpgme_strerror(rc));

311

285

return false;

312

286

}

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,

369

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

374

? "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

}

388

287

389

ret = close(fd);

288

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

390

289

if(ret == -1){

391

290

perror_plus("close");

392

291

}

431

330

/* Create new GPGME "context" */

432

331

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

433

332

if(rc != GPG_ERR_NO_ERROR){

434

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

435

gpgme_strsource(rc), gpgme_strerror(rc));

333

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

334

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

335

gpgme_strerror(rc));

436

336

return false;

437

337

}

438

338

447

347

* Decrypt OpenPGP data.

448

348

* Returns -1 on error

449

349

*/

450

__attribute__((nonnull, warn_unused_result))

451

350

static ssize_t pgp_packet_decrypt(const char *cryptotext,

452

351

size_t crypto_size,

453

352

char **plaintext,

474

373

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

475

374

rc = gpgme_data_new(&dh_plain);

476

375

if(rc != GPG_ERR_NO_ERROR){

477

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

376

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

377

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

478

378

gpgme_strsource(rc), gpgme_strerror(rc));

479

379

gpgme_data_release(dh_crypto);

480

380

return -1;

493

393

if(result == NULL){

494

394

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

495

395

} else {

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");

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);

502

400

if(result->file_name != NULL){

503

401

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

504

402

}

574

472

return plaintext_length;

575

473

}

576

474

577

__attribute__((warn_unused_result, const))

578

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

579

if(str == NULL)

580

return "(unknown)";

581

return str;

582

}

583

584

__attribute__((warn_unused_result))

585

static const char *safer_gnutls_strerror(int value){

475

static const char * safer_gnutls_strerror(int value){

586

476

const char *ret = gnutls_strerror(value);

587

return safe_string(ret);

477

if(ret == NULL)

478

ret = "(unknown)";

479

return ret;

588

480

}

589

481

590

482

/* GnuTLS log function callback */

591

__attribute__((nonnull))

592

483

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

593

484

const char* string){

594

485

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

595

486

}

596

487

597

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

598

488

static int init_gnutls_global(const char *pubkeyfilename,

599

489

const char *seckeyfilename,

600

const char *dhparamsfilename,

601

490

mandos_context *mc){

602

491

int ret;

603

unsigned int uret;

604

492

605

493

if(debug){

606

494

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

607

495

}

608

496

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

609

504

if(debug){

610

505

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

611

506

* - GnuTLS manual

619

514

if(ret != GNUTLS_E_SUCCESS){

620

515

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

621

516

safer_gnutls_strerror(ret));

517

gnutls_global_deinit();

622

518

return -1;

623

519

}

624

520

649

545

safer_gnutls_strerror(ret));

650

546

goto globalfail;

651

547

}

652

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

653

if(dhparamsfilename != NULL){

654

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

655

do {

656

int dhpfile = open(dhparamsfilename, O_RDONLY);

657

if(dhpfile == -1){

658

perror_plus("open");

659

dhparamsfilename = NULL;

660

break;

661

}

662

size_t params_capacity = 0;

663

while(true){

664

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

665

(size_t)params.size,

666

(size_t)params_capacity);

667

if(params_capacity == 0){

668

perror_plus("incbuffer");

669

free(params.data);

670

params.data = NULL;

671

dhparamsfilename = NULL;

672

break;

673

}

674

ssize_t bytes_read = read(dhpfile,

675

params.data + params.size,

676

BUFFER_SIZE);

677

/* EOF */

678

if(bytes_read == 0){

679

break;

680

}

681

/* check bytes_read for failure */

682

if(bytes_read < 0){

683

perror_plus("read");

684

free(params.data);

685

params.data = NULL;

686

dhparamsfilename = NULL;

687

break;

688

}

689

params.size += (unsigned int)bytes_read;

690

}

691

ret = close(dhpfile);

692

if(ret == -1){

693

perror_plus("close");

694

}

695

if(params.data == NULL){

696

dhparamsfilename = NULL;

697

}

698

if(dhparamsfilename == NULL){

699

break;

700

}

701

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

702

GNUTLS_X509_FMT_PEM);

703

if(ret != GNUTLS_E_SUCCESS){

704

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

705

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

706

safer_gnutls_strerror(ret));

707

dhparamsfilename = NULL;

708

}

709

free(params.data);

710

} while(false);

711

}

712

if(dhparamsfilename == NULL){

713

if(mc->dh_bits == 0){

714

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

715

/* Try to read the private key file */

716

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

717

do {

718

int secfile = open(seckeyfilename, O_RDONLY);

719

if(secfile == -1){

720

perror_plus("open");

721

break;

722

}

723

size_t buffer_capacity = 0;

724

while(true){

725

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

726

(size_t)buffer.size,

727

(size_t)buffer_capacity);

728

if(buffer_capacity == 0){

729

perror_plus("incbuffer");

730

free(buffer.data);

731

buffer.data = NULL;

732

break;

733

}

734

ssize_t bytes_read = read(secfile,

735

buffer.data + buffer.size,

736

BUFFER_SIZE);

737

/* EOF */

738

if(bytes_read == 0){

739

break;

740

}

741

/* check bytes_read for failure */

742

if(bytes_read < 0){

743

perror_plus("read");

744

free(buffer.data);

745

buffer.data = NULL;

746

break;

747

}

748

buffer.size += (unsigned int)bytes_read;

749

}

750

close(secfile);

751

} while(false);

752

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

753

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

754

if(buffer.data != NULL){

755

{

756

gnutls_openpgp_privkey_t privkey = NULL;

757

ret = gnutls_openpgp_privkey_init(&privkey);

758

if(ret != GNUTLS_E_SUCCESS){

759

fprintf_plus(stderr, "Error initializing OpenPGP key"

760

" structure: %s",

761

safer_gnutls_strerror(ret));

762

free(buffer.data);

763

buffer.data = NULL;

764

} else {

765

ret = gnutls_openpgp_privkey_import

766

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

767

if(ret != GNUTLS_E_SUCCESS){

768

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

769

safer_gnutls_strerror(ret));

770

privkey = NULL;

771

}

772

free(buffer.data);

773

buffer.data = NULL;

774

if(privkey != NULL){

775

/* Use private key to suggest an appropriate

776

sec_param */

777

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

778

gnutls_openpgp_privkey_deinit(privkey);

779

if(debug){

780

fprintf_plus(stderr, "This OpenPGP key implies using"

781

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

782

safe_string(gnutls_sec_param_get_name

783

(sec_param)));

784

}

785

}

786

}

787

}

788

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

789

/* Err on the side of caution */

790

sec_param = GNUTLS_SEC_PARAM_ULTRA;

791

if(debug){

792

fprintf_plus(stderr, "Falling back to security parameter"

793

" \"%s\"\n",

794

safe_string(gnutls_sec_param_get_name

795

(sec_param)));

796

}

797

}

798

}

799

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

800

if(uret != 0){

801

mc->dh_bits = uret;

802

if(debug){

803

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

804

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

805

safe_string(gnutls_sec_param_get_name

806

(sec_param)),

807

mc->dh_bits);

808

}

809

} else {

810

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

811

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

812

safe_string(gnutls_sec_param_get_name

813

(sec_param)),

814

safer_gnutls_strerror(ret));

815

goto globalfail;

816

}

817

} else if(debug){

818

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

819

mc->dh_bits);

820

}

821

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

822

if(ret != GNUTLS_E_SUCCESS){

823

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

824

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

825

safer_gnutls_strerror(ret));

826

goto globalfail;

827

}

828

}

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

829

555

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

830

556

831

557

return 0;

833

559

globalfail:

834

560

835

561

gnutls_certificate_free_credentials(mc->cred);

562

gnutls_global_deinit();

836

563

gnutls_dh_params_deinit(mc->dh_params);

837

564

return -1;

838

565

}

839

566

840

__attribute__((nonnull, warn_unused_result))

841

567

static int init_gnutls_session(gnutls_session_t *session,

842

568

mandos_context *mc){

843

569

int ret;

890

616

/* ignore client certificate if any. */

891

617

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

892

618

619

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

620

893

621

return 0;

894

622

}

895

623

897

625

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

898

626

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

899

627

900

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

901

__attribute__((warn_unused_result))

902

int raise_privileges(void){

903

int old_errno = errno;

904

int ret = 0;

905

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

906

ret = errno;

907

}

908

errno = old_errno;

909

return ret;

910

}

911

912

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

913

__attribute__((warn_unused_result))

914

int raise_privileges_permanently(void){

915

int old_errno = errno;

916

int ret = raise_privileges();

917

if(ret != 0){

918

errno = old_errno;

919

return ret;

920

}

921

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

922

ret = errno;

923

}

924

errno = old_errno;

925

return ret;

926

}

927

928

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

929

__attribute__((warn_unused_result))

930

int lower_privileges(void){

931

int old_errno = errno;

932

int ret = 0;

933

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

934

ret = errno;

935

}

936

errno = old_errno;

937

return ret;

938

}

939

940

/* Lower privileges permanently */

941

__attribute__((warn_unused_result))

942

int lower_privileges_permanently(void){

943

int old_errno = errno;

944

int ret = 0;

945

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

946

ret = errno;

947

}

948

errno = old_errno;

949

return ret;

950

}

951

952

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

953

__attribute__((nonnull, warn_unused_result))

954

static bool add_delete_local_route(const bool add,

955

const char *address,

956

AvahiIfIndex if_index){

957

int ret;

958

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

959

char add_arg[] = "add";

960

char delete_arg[] = "delete";

961

char debug_flag[] = "--debug";

962

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

963

if(pluginhelperdir == NULL){

964

if(debug){

965

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

966

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

967

}

968

return false;

969

}

970

971

char interface[IF_NAMESIZE];

972

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

973

perror_plus("if_indextoname");

974

return false;

975

}

976

977

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

978

if(devnull == -1){

979

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

980

return false;

981

}

982

pid_t pid = fork();

983

if(pid == 0){

984

/* Child */

985

/* Raise privileges */

986

errno = raise_privileges_permanently();

987

if(errno != 0){

988

perror_plus("Failed to raise privileges");

989

/* _exit(EX_NOPERM); */

990

} else {

991

/* Set group */

992

errno = 0;

993

ret = setgid(0);

994

if(ret == -1){

995

perror_plus("setgid");

996

_exit(EX_NOPERM);

997

}

998

/* Reset supplementary groups */

999

errno = 0;

1000

ret = setgroups(0, NULL);

1001

if(ret == -1){

1002

perror_plus("setgroups");

1003

_exit(EX_NOPERM);

1004

}

1005

}

1006

ret = dup2(devnull, STDIN_FILENO);

1007

if(ret == -1){

1008

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

1009

_exit(EX_OSERR);

1010

}

1011

ret = close(devnull);

1012

if(ret == -1){

1013

perror_plus("close");

1014

_exit(EX_OSERR);

1015

}

1016

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1017

if(ret == -1){

1018

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

1019

_exit(EX_OSERR);

1020

}

1021

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

1022

O_RDONLY

1023

| O_DIRECTORY

1024

| O_PATH

1025

| O_CLOEXEC));

1026

if(helperdir_fd == -1){

1027

perror_plus("open");

1028

_exit(EX_UNAVAILABLE);

1029

}

1030

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

1031

helper, O_RDONLY));

1032

if(helper_fd == -1){

1033

perror_plus("openat");

1034

close(helperdir_fd);

1035

_exit(EX_UNAVAILABLE);

1036

}

1037

close(helperdir_fd);

1038

#ifdef __GNUC__

1039

#pragma GCC diagnostic push

1040

#pragma GCC diagnostic ignored "-Wcast-qual"

1041

#endif

1042

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

1043

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

1044

interface, debug ? debug_flag : NULL, NULL },

1045

environ) == -1){

1046

#ifdef __GNUC__

1047

#pragma GCC diagnostic pop

1048

#endif

1049

perror_plus("fexecve");

1050

_exit(EXIT_FAILURE);

1051

}

1052

}

1053

if(pid == -1){

1054

perror_plus("fork");

1055

return false;

1056

}

1057

int status;

1058

pid_t pret = -1;

1059

errno = 0;

1060

do {

1061

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

1062

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

1063

int errno_raising = 0;

1064

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

1065

errno_raising = errno;

1066

perror_plus("Failed to raise privileges in order to"

1067

" kill helper program");

1068

}

1069

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

1070

perror_plus("kill");

1071

}

1072

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

1073

perror_plus("Failed to lower privileges after killing"

1074

" helper program");

1075

}

1076

return false;

1077

}

1078

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

1079

if(pret == -1){

1080

perror_plus("waitpid");

1081

return false;

1082

}

1083

if(WIFEXITED(status)){

1084

if(WEXITSTATUS(status) != 0){

1085

fprintf_plus(stderr, "Error: iprouteadddel exited"

1086

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

1087

return false;

1088

}

1089

return true;

1090

}

1091

if(WIFSIGNALED(status)){

1092

fprintf_plus(stderr, "Error: iprouteadddel died by"

1093

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

1094

return false;

1095

}

1096

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

1097

return false;

1098

}

1099

1100

__attribute__((nonnull, warn_unused_result))

1101

static bool add_local_route(const char *address,

1102

AvahiIfIndex if_index){

1103

if(debug){

1104

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

1105

}

1106

return add_delete_local_route(true, address, if_index);

1107

}

1108

1109

__attribute__((nonnull, warn_unused_result))

1110

static bool delete_local_route(const char *address,

1111

AvahiIfIndex if_index){

1112

if(debug){

1113

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

1114

}

1115

return add_delete_local_route(false, address, if_index);

1116

}

1117

1118

628

/* Called when a Mandos server is found */

1119

__attribute__((nonnull, warn_unused_result))

1120

629

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

1121

630

AvahiIfIndex if_index,

1122

631

int af, mandos_context *mc){

1123

632

int ret, tcp_sd = -1;

1124

633

ssize_t sret;

1125

struct sockaddr_storage to;

634

union {

635

struct sockaddr_in in;

636

struct sockaddr_in6 in6;

637

} to;

1126

638

char *buffer = NULL;

1127

639

char *decrypted_buffer = NULL;

1128

640

size_t buffer_length = 0;

1131

643

int retval = -1;

1132

644

gnutls_session_t session;

1133

645

int pf; /* Protocol family */

1134

bool route_added = false;

1135

646

1136

647

errno = 0;

1137

648

1159

670

bool match = false;

1160

671

{

1161

672

char *interface = NULL;

1162

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

1163

mc->interfaces_size,

1164

interface))){

673

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

674

interface))){

1165

675

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

1166

676

match = true;

1167

677

break;

1196

706

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

1197

707

}

1198

708

1199

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

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

1200

710

if(tcp_sd < 0){

1201

711

int e = errno;

1202

712

perror_plus("socket");

1209

719

goto mandos_end;

1210

720

}

1211

721

722

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

1212

723

if(af == AF_INET6){

1213

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

1214

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

1215

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

724

to.in6.sin6_family = (sa_family_t)af;

725

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

1216

726

} else { /* IPv4 */

1217

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

1218

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

1219

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

727

to.in.sin_family = (sa_family_t)af;

728

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

1220

729

}

1221

730

if(ret < 0 ){

1222

731

int e = errno;

1231

740

goto mandos_end;

1232

741

}

1233

742

if(af == AF_INET6){

1234

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

1235

if(IN6_IS_ADDR_LINKLOCAL

1236

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

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

1237

753

if(if_index == AVAHI_IF_UNSPEC){

1238

754

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

1239

755

" incomplete without a network interface\n");

1241

757

goto mandos_end;

1242

758

}

1243

759

/* Set the network interface number as scope */

1244

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

760

to.in6.sin6_scope_id = (uint32_t)if_index;

1245

761

}

1246

762

} else {

1247

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

763

to.in.sin_port = htons(port);

1248

764

}

1249

765

1250

766

if(quit_now){

1267

783

}

1268

784

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1269

785

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1270

if(af == AF_INET6){

1271

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

1272

sizeof(struct sockaddr_in6),

1273

addrstr, sizeof(addrstr), NULL, 0,

1274

NI_NUMERICHOST);

1275

} else {

1276

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

1277

sizeof(struct sockaddr_in),

1278

addrstr, sizeof(addrstr), NULL, 0,

1279

NI_NUMERICHOST);

1280

}

1281

if(ret == EAI_SYSTEM){

1282

perror_plus("getnameinfo");

1283

} else if(ret != 0) {

1284

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

1285

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

1286

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

1287

}

1288

}

1289

1290

if(quit_now){

1291

errno = EINTR;

1292

goto mandos_end;

1293

}

1294

1295

while(true){

1296

if(af == AF_INET6){

1297

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

1298

sizeof(struct sockaddr_in6));

1299

} else {

1300

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

1301

sizeof(struct sockaddr_in));

1302

}

1303

if(ret < 0){

1304

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

1305

and if_index != AVAHI_IF_UNSPEC

1306

and connect_to == NULL

1307

and not route_added and

1308

((af == AF_INET6 and not

1309

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1310

&to)->sin6_addr)))

1311

or (af == AF_INET and

1312

/* Not a a IPv4LL address */

1313

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

1314

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

1315

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

1316

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

1317

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

1318

connect to a Mandos server announced by Avahi on a server

1319

host with a global address. Work around this by retrying

1320

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

1321

1322

Avahi bug reference:

1323

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

1324

https://bugs.debian.org/587961

1325

*/

1326

if(debug){

1327

fprintf_plus(stderr, "Mandos server unreachable, trying"

1328

" direct route\n");

1329

}

1330

int e = errno;

1331

route_added = add_local_route(ip, if_index);

1332

if(route_added){

1333

continue;

1334

}

1335

errno = e;

1336

}

1337

if(errno != ECONNREFUSED or debug){

1338

int e = errno;

1339

perror_plus("connect");

1340

errno = e;

1341

}

1342

goto mandos_end;

1343

}

1344

1345

if(quit_now){

1346

errno = EINTR;

1347

goto mandos_end;

1348

}

1349

break;

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;

1350

825

}

1351

826

1352

827

const char *out = mandos_protocol_version;

1506

981

&decrypted_buffer, mc);

1507

982

if(decrypted_buffer_size >= 0){

1508

983

1509

clearerr(stdout);

1510

984

written = 0;

1511

985

while(written < (size_t) decrypted_buffer_size){

1512

986

if(quit_now){

1528

1002

}

1529

1003

written += (size_t)ret;

1530

1004

}

1531

ret = fflush(stdout);

1532

if(ret != 0){

1533

int e = errno;

1534

if(debug){

1535

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

1536

strerror(errno));

1537

}

1538

errno = e;

1539

goto mandos_end;

1540

}

1541

1005

retval = 0;

1542

1006

}

1543

1007

}

1546

1010

1547

1011

mandos_end:

1548

1012

{

1549

if(route_added){

1550

if(not delete_local_route(ip, if_index)){

1551

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

1552

" interface %d", ip, if_index);

1553

}

1554

}

1555

1013

int e = errno;

1556

1014

free(decrypted_buffer);

1557

1015

free(buffer);

1558

1016

if(tcp_sd >= 0){

1559

ret = close(tcp_sd);

1017

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

1560

1018

}

1561

1019

if(ret == -1){

1562

1020

if(e == 0){

1587

1045

AVAHI_GCC_UNUSED AvahiStringList *txt,

1588

1046

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1589

1047

flags,

1590

void *mc){

1048

void* mc){

1591

1049

if(r == NULL){

1592

1050

return;

1593

1051

}

1596

1054

timed out */

1597

1055

1598

1056

if(quit_now){

1599

avahi_s_service_resolver_free(r);

1600

1057

return;

1601

1058

}

1602

1059

1647

1104

const char *domain,

1648

1105

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1649

1106

flags,

1650

void *mc){

1107

void* mc){

1651

1108

if(b == NULL){

1652

1109

return;

1653

1110

}

1713

1170

errno = old_errno;

1714

1171

}

1715

1172

1716

__attribute__((nonnull, warn_unused_result))

1717

1173

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

1718

1174

int ret;

1719

int old_errno;

1175

error_t ret_errno;

1720

1176

1721

1177

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

1722

1178

if(s < 0){

1723

old_errno = errno;

1179

ret_errno = errno;

1724

1180

perror_plus("socket");

1725

errno = old_errno;

1181

errno = ret_errno;

1726

1182

return false;

1727

1183

}

1728

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

1729

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

1184

strcpy(ifr->ifr_name, ifname);

1730

1185

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1731

1186

if(ret == -1){

1732

1187

if(debug){

1733

old_errno = errno;

1188

ret_errno = errno;

1734

1189

perror_plus("ioctl SIOCGIFFLAGS");

1735

errno = old_errno;

1736

}

1737

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

1738

old_errno = errno;

1739

perror_plus("close");

1740

errno = old_errno;

1190

errno = ret_errno;

1741

1191

}

1742

1192

return false;

1743

1193

}

1744

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

1745

old_errno = errno;

1746

perror_plus("close");

1747

errno = old_errno;

1748

}

1749

1194

return true;

1750

1195

}

1751

1196

1752

__attribute__((nonnull, warn_unused_result))

1753

1197

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

1754

1198

1755

1199

/* Reject the loopback device */

1797

1241

* corresponds to an acceptable network device.

1798

1242

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

1799

1243

*/

1800

__attribute__((nonnull, warn_unused_result))

1801

1244

int good_interface(const struct dirent *if_entry){

1802

1245

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

1803

1246

return 0;

1821

1264

/*

1822

1265

* This function determines if a network interface is up.

1823

1266

*/

1824

__attribute__((nonnull, warn_unused_result))

1825

1267

bool interface_is_up(const char *interface){

1826

1268

struct ifreq ifr;

1827

1269

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

1838

1280

/*

1839

1281

* This function determines if a network interface is running

1840

1282

*/

1841

__attribute__((nonnull, warn_unused_result))

1842

1283

bool interface_is_running(const char *interface){

1843

1284

struct ifreq ifr;

1844

1285

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

1852

1293

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

1853

1294

}

1854

1295

1855

__attribute__((nonnull, pure, warn_unused_result))

1856

1296

int notdotentries(const struct dirent *direntry){

1857

1297

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

1858

1298

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

1865

1305

}

1866

1306

1867

1307

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

1868

__attribute__((nonnull, warn_unused_result))

1869

1308

int runnable_hook(const struct dirent *direntry){

1870

1309

int ret;

1871

1310

size_t sret;

1879

1318

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

1880

1319

"abcdefghijklmnopqrstuvwxyz"

1881

1320

"0123456789"

1882

"_.-");

1321

"_-");

1883

1322

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

1884

1323

/* Contains non-allowed characters */

1885

1324

if(debug){

1889

1328

return 0;

1890

1329

}

1891

1330

1892

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

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);

1893

1339

if(ret == -1){

1894

1340

if(debug){

1895

1341

perror_plus("Could not stat hook");

1919

1365

return 1;

1920

1366

}

1921

1367

1922

__attribute__((nonnull, warn_unused_result))

1923

1368

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1924

1369

mandos_context *mc){

1925

1370

int ret;

1929

1374

1930

1375

while(true){

1931

1376

if(mc->current_server == NULL){

1932

if(debug){

1377

if (debug){

1933

1378

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

1934

1379

" No timeout!\n");

1935

1380

}

1936

1381

ret = avahi_simple_poll_iterate(s, -1);

1937

1382

} else {

1938

if(debug){

1383

if (debug){

1939

1384

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

1940

1385

" it, or wait\n");

1941

1386

}

1958

1403

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

1959

1404

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

1960

1405

1961

if(debug){

1406

if (debug){

1962

1407

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

1963

1408

block_time);

1964

1409

}

1986

1431

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

1987

1432

}

1988

1433

if(ret != 0){

1989

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

1434

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

1990

1435

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

1991

1436

}

1992

1437

}

1993

1438

}

1994

1439

}

1995

1440

1996

__attribute__((nonnull))

1997

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

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,

1998

1494

const float delay){

1999

struct dirent **direntries = NULL;

2000

if(hookdir_fd == -1){

2001

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2002

| O_CLOEXEC);

2003

if(hookdir_fd == -1){

2004

if(errno == ENOENT){

2005

if(debug){

2006

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

2007

" found\n", hookdir);

2008

}

2009

} else {

2010

perror_plus("open");

2011

}

2012

return;

2013

}

2014

}

2015

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

2016

if(devnull == -1){

2017

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

2018

return;

2019

}

2020

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

2021

runnable_hook, alphasort);

1495

struct dirent **direntries;

1496

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

1497

alphasort);

2022

1498

if(numhooks == -1){

2023

perror_plus("scandir");

2024

close(devnull);

2025

return;

2026

}

2027

struct dirent *direntry;

2028

int ret;

2029

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

2030

direntry = direntries[i];

2031

if(debug){

2032

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

2033

direntry->d_name);

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");

2034

1506

}

2035

pid_t hook_pid = fork();

2036

if(hook_pid == 0){

2037

/* Child */

2038

/* Raise privileges */

2039

errno = raise_privileges_permanently();

2040

if(errno != 0){

2041

perror_plus("Failed to raise privileges");

2042

_exit(EX_NOPERM);

2043

}

2044

/* Set group */

2045

errno = 0;

2046

ret = setgid(0);

2047

if(ret == -1){

2048

perror_plus("setgid");

2049

_exit(EX_NOPERM);

2050

}

2051

/* Reset supplementary groups */

2052

errno = 0;

2053

ret = setgroups(0, NULL);

2054

if(ret == -1){

2055

perror_plus("setgroups");

2056

_exit(EX_NOPERM);

2057

}

2058

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

2059

if(ret == -1){

2060

perror_plus("setenv");

2061

_exit(EX_OSERR);

2062

}

2063

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

2064

if(ret == -1){

2065

perror_plus("setenv");

2066

_exit(EX_OSERR);

2067

}

2068

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

2069

if(ret == -1){

2070

perror_plus("setenv");

2071

_exit(EX_OSERR);

2072

}

2073

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

2074

if(ret == -1){

2075

perror_plus("setenv");

2076

_exit(EX_OSERR);

2077

}

2078

char *delaystring;

2079

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

2080

if(ret == -1){

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){

2081

1516

perror_plus("asprintf");

2082

_exit(EX_OSERR);

2083

}

2084

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

2085

if(ret == -1){

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

}

2086

1575

free(delaystring);

2087

perror_plus("setenv");

2088

_exit(EX_OSERR);

2089

}

2090

free(delaystring);

2091

if(connect_to != NULL){

2092

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

2093

if(ret == -1){

2094

perror_plus("setenv");

2095

_exit(EX_OSERR);

2096

}

2097

}

2098

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

2099

direntry->d_name,

2100

O_RDONLY));

2101

if(hook_fd == -1){

2102

perror_plus("openat");

2103

_exit(EXIT_FAILURE);

2104

}

2105

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

2106

perror_plus("close");

2107

_exit(EXIT_FAILURE);

2108

}

2109

ret = dup2(devnull, STDIN_FILENO);

2110

if(ret == -1){

2111

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

2112

_exit(EX_OSERR);

2113

}

2114

ret = close(devnull);

2115

if(ret == -1){

2116

perror_plus("close");

2117

_exit(EX_OSERR);

2118

}

2119

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2120

if(ret == -1){

2121

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

2122

_exit(EX_OSERR);

2123

}

2124

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

2125

environ) == -1){

2126

perror_plus("fexecve");

2127

_exit(EXIT_FAILURE);

2128

}

2129

} else {

2130

if(hook_pid == -1){

2131

perror_plus("fork");

2132

free(direntry);

2133

continue;

2134

}

2135

int status;

2136

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

2137

perror_plus("waitpid");

2138

free(direntry);

2139

continue;

2140

}

2141

if(WIFEXITED(status)){

2142

if(WEXITSTATUS(status) != 0){

2143

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

2144

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

2145

WEXITSTATUS(status));

2146

free(direntry);

2147

continue;

2148

}

2149

} else if(WIFSIGNALED(status)){

2150

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

2151

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

2152

WTERMSIG(status));

2153

free(direntry);

2154

continue;

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

}

2155

1587

} else {

2156

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

2157

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

2158

free(direntry);

2159

continue;

2160

}

2161

}

2162

if(debug){

2163

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

2164

direntry->d_name);

2165

}

2166

free(direntry);

2167

}

2168

free(direntries);

2169

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

2170

perror_plus("close");

2171

} else {

2172

hookdir_fd = -1;

2173

}

2174

close(devnull);

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;

2175

1624

}

2176

1625

2177

__attribute__((nonnull, warn_unused_result))

2178

int bring_up_interface(const char *const interface,

2179

const float delay){

2180

int old_errno = errno;

2181

int ret;

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;

2182

1632

struct ifreq network;

2183

1633

unsigned int if_index = if_nametoindex(interface);

2184

1634

if(if_index == 0){

2193

1643

}

2194

1644

2195

1645

if(not interface_is_up(interface)){

2196

int ret_errno = 0;

2197

int ioctl_errno = 0;

2198

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

1646

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

2199

1647

ret_errno = errno;

2200

1648

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

2201

1649

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

2202

errno = old_errno;

2203

1650

return ret_errno;

2204

1651

}

2205

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

1652

network.ifr_flags |= IFF_UP;

2206

1653

2207

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

2208

if(sd == -1){

1654

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1655

if(sd < 0){

2209

1656

ret_errno = errno;

2210

1657

perror_plus("socket");

2211

1658

errno = old_errno;

2212

1659

return ret_errno;

2213

1660

}

2214

1661

2215

1662

if(quit_now){

2216

ret = close(sd);

2217

if(ret == -1){

2218

perror_plus("close");

2219

}

1663

close(sd);

2220

1664

errno = old_errno;

2221

1665

return EINTR;

2222

1666

}

2226

1670

interface);

2227

1671

}

2228

1672

2229

/* Raise privileges */

2230

ret_errno = raise_privileges();

2231

if(ret_errno != 0){

2232

errno = ret_errno;

2233

perror_plus("Failed to raise privileges");

2234

}

1673

/* Raise priviliges */

1674

raise_privileges();

2235

1675

2236

1676

#ifdef __linux__

2237

int ret_linux;

2238

bool restore_loglevel = false;

2239

if(ret_errno == 0){

2240

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2241

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

2242

ret_linux = klogctl(8, NULL, 5);

2243

if(ret_linux == -1){

2244

perror_plus("klogctl");

2245

} else {

2246

restore_loglevel = true;

2247

}

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");

2248

1684

}

2249

1685

#endif /* __linux__ */

2250

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

2251

ioctl_errno = errno;

1686

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

1687

ret_errno = errno;

2252

1688

#ifdef __linux__

2253

1689

if(restore_loglevel){

2254

1690

ret_linux = klogctl(7, NULL, 0);

2258

1694

}

2259

1695

#endif /* __linux__ */

2260

1696

2261

/* If raise_privileges() succeeded above */

2262

if(ret_errno == 0){

2263

/* Lower privileges */

2264

ret_errno = lower_privileges();

2265

if(ret_errno != 0){

2266

errno = ret_errno;

2267

perror_plus("Failed to lower privileges");

2268

}

2269

}

1697

/* Lower privileges */

1698

lower_privileges();

2270

1699

2271

1700

/* Close the socket */

2272

ret = close(sd);

1701

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

2273

1702

if(ret == -1){

2274

1703

perror_plus("close");

2275

1704

}

2276

1705

2277

1706

if(ret_setflags == -1){

2278

errno = ioctl_errno;

1707

errno = ret_errno;

2279

1708

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2280

1709

errno = old_errno;

2281

return ioctl_errno;

1710

return ret_errno;

2282

1711

}

2283

1712

} else if(debug){

2284

1713

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

2287

1716

2288

1717

/* Sleep checking until interface is running.

2289

1718

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

2290

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

1719

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

2291

1720

if(interface_is_running(interface)){

2292

1721

break;

2293

1722

}

2302

1731

return 0;

2303

1732

}

2304

1733

2305

__attribute__((nonnull, warn_unused_result))

2306

int take_down_interface(const char *const interface){

2307

int old_errno = errno;

1734

error_t take_down_interface(const char *const interface){

1735

error_t old_errno = errno;

2308

1736

struct ifreq network;

2309

1737

unsigned int if_index = if_nametoindex(interface);

2310

1738

if(if_index == 0){

2313

1741

return ENXIO;

2314

1742

}

2315

1743

if(interface_is_up(interface)){

2316

int ret_errno = 0;

2317

int ioctl_errno = 0;

1744

error_t ret_errno = 0;

2318

1745

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

2319

1746

ret_errno = errno;

2320

1747

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

2321

1748

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

2322

errno = old_errno;

2323

1749

return ret_errno;

2324

1750

}

2325

1751

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

2326

1752

2327

1753

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

2328

if(sd == -1){

1754

if(sd < 0){

2329

1755

ret_errno = errno;

2330

1756

perror_plus("socket");

2331

1757

errno = old_errno;

2337

1763

interface);

2338

1764

}

2339

1765

2340

/* Raise privileges */

2341

ret_errno = raise_privileges();

2342

if(ret_errno != 0){

2343

errno = ret_errno;

2344

perror_plus("Failed to raise privileges");

2345

}

1766

/* Raise priviliges */

1767

raise_privileges();

2346

1768

2347

1769

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

2348

ioctl_errno = errno;

1770

ret_errno = errno;

2349

1771

2350

/* If raise_privileges() succeeded above */

2351

if(ret_errno == 0){

2352

/* Lower privileges */

2353

ret_errno = lower_privileges();

2354

if(ret_errno != 0){

2355

errno = ret_errno;

2356

perror_plus("Failed to lower privileges");

2357

}

2358

}

1772

/* Lower privileges */

1773

lower_privileges();

2359

1774

2360

1775

/* Close the socket */

2361

int ret = close(sd);

1776

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

2362

1777

if(ret == -1){

2363

1778

perror_plus("close");

2364

1779

}

2365

1780

2366

1781

if(ret_setflags == -1){

2367

errno = ioctl_errno;

1782

errno = ret_errno;

2368

1783

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2369

1784

errno = old_errno;

2370

return ioctl_errno;

1785

return ret_errno;

2371

1786

}

2372

1787

} else if(debug){

2373

1788

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

2379

1794

}

2380

1795

2381

1796

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

2382

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

2383

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

2384

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

2385

.current_server = NULL, .interfaces = NULL,

2386

.interfaces_size = 0 };

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 };

2387

1801

AvahiSServiceBrowser *sb = NULL;

2388

1802

error_t ret_errno;

2389

1803

int ret;

2392

1806

int exitcode = EXIT_SUCCESS;

2393

1807

char *interfaces_to_take_down = NULL;

2394

1808

size_t interfaces_to_take_down_size = 0;

2395

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

2396

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

2397

char *tempdir = NULL;

1809

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

1810

bool tempdir_created = false;

2398

1811

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2399

1812

const char *seckey = PATHDIR "/" SECKEY;

2400

1813

const char *pubkey = PATHDIR "/" PUBKEY;

2401

const char *dh_params_file = NULL;

2402

1814

char *interfaces_hooks = NULL;

2403

1815

2404

1816

bool gnutls_initialized = false;

2457

1869

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

2458

1870

" Diffie-Hellman key exchange",

2459

1871

.group = 2 },

2460

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

2461

.arg = "FILE",

2462

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

2463

" for the Diffie-Hellman key exchange",

2464

.group = 2 },

2465

1872

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

2466

1873

.arg = "STRING",

2467

1874

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

2522

1929

}

2523

1930

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

2524

1931

break;

2525

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

2526

dh_params_file = arg;

2527

break;

2528

1932

case 130: /* --priority */

2529

1933

mc.priority = arg;

2530

1934

break;

2570

1974

.args_doc = "",

2571

1975

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

2572

1976

" passwords from a Mandos server" };

2573

ret_errno = argp_parse(&argp, argc, argv,

2574

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2575

switch(ret_errno){

1977

ret = argp_parse(&argp, argc, argv,

1978

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1979

switch(ret){

2576

1980

case 0:

2577

1981

break;

2578

1982

case ENOMEM:

2579

1983

default:

2580

errno = ret_errno;

1984

errno = ret;

2581

1985

perror_plus("argp_parse");

2582

1986

exitcode = EX_OSERR;

2583

1987

goto end;

2586

1990

goto end;

2587

1991

}

2588

1992

}

2589

1993

2590

1994

{

2591

1995

/* Work around Debian bug #633582:

2592

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

1996

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

2593

1997

2594

/* Re-raise privileges */

2595

ret = raise_privileges();

2596

if(ret != 0){

2597

errno = ret;

2598

perror_plus("Failed to raise privileges");

2599

} else {

1998

/* Re-raise priviliges */

1999

if(raise_privileges() == 0){

2600

2000

struct stat st;

2601

2001

2602

2002

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

2616

2016

}

2617

2017

}

2618

2018

}

2619

close(seckey_fd);

2019

TEMP_FAILURE_RETRY(close(seckey_fd));

2620

2020

}

2621

2021

}

2622

2022

2623

2023

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

2624

2024

int pubkey_fd = open(pubkey, O_RDONLY);

2625

2025

if(pubkey_fd == -1){

2637

2037

}

2638

2038

}

2639

2039

}

2640

close(pubkey_fd);

2641

}

2642

}

2643

2644

if(dh_params_file != NULL

2645

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

2646

int dhparams_fd = open(dh_params_file, O_RDONLY);

2647

if(dhparams_fd == -1){

2648

perror_plus("open");

2649

} else {

2650

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

2651

if(ret == -1){

2652

perror_plus("fstat");

2653

} else {

2654

if(S_ISREG(st.st_mode)

2655

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

2656

ret = fchown(dhparams_fd, uid, gid);

2657

if(ret == -1){

2658

perror_plus("fchown");

2659

}

2660

}

2661

}

2662

close(dhparams_fd);

2663

}

2664

}

2665

2040

TEMP_FAILURE_RETRY(close(pubkey_fd));

2041

}

2042

}

2043

2666

2044

/* Lower privileges */

2667

ret = lower_privileges();

2668

if(ret != 0){

2669

errno = ret;

2670

perror_plus("Failed to lower privileges");

2671

}

2045

lower_privileges();

2672

2046

}

2673

2047

}

2674

2048

2700

2074

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

2701

2075

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

2702

2076

}

2703

run_network_hooks("start", interfaces_hooks != NULL ?

2704

interfaces_hooks : "", delay);

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2705

2081

}

2706

2082

2707

2083

if(not debug){

2785

2161

2786

2162

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

2787

2163

if(mc.interfaces == NULL){

2788

struct dirent **direntries = NULL;

2164

struct dirent **direntries;

2789

2165

/* Look for any good interfaces */

2790

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2791

2167

alphasort);

2797

2173

if(ret_errno != 0){

2798

2174

errno = ret_errno;

2799

2175

perror_plus("argz_add");

2800

free(direntries[i]);

2801

2176

continue;

2802

2177

}

2803

2178

if(debug){

2804

2179

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

2805

2180

direntries[i]->d_name);

2806

2181

}

2807

free(direntries[i]);

2808

2182

}

2809

2183

free(direntries);

2810

2184

} else {

2811

if(ret == 0){

2812

free(direntries);

2813

}

2185

free(direntries);

2814

2186

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

2815

2187

exitcode = EXIT_FAILURE;

2816

2188

goto end;

2839

2211

break;

2840

2212

}

2841

2213

bool interface_was_up = interface_is_up(interface);

2842

errno = bring_up_interface(interface, delay);

2214

ret = bring_up_interface(interface, delay);

2843

2215

if(not interface_was_up){

2844

if(errno != 0){

2845

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

2846

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

2216

if(ret != 0){

2217

errno = ret;

2218

perror_plus("Failed to bring up interface");

2847

2219

} else {

2848

errno = argz_add(&interfaces_to_take_down,

2849

&interfaces_to_take_down_size,

2850

interface);

2851

if(errno != 0){

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;

2852

2225

perror_plus("argz_add");

2853

2226

}

2854

2227

}

2872

2245

goto end;

2873

2246

}

2874

2247

2875

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

2248

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

2876

2249

if(ret == -1){

2877

2250

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

2878

2251

exitcode = EX_UNAVAILABLE;

2885

2258

goto end;

2886

2259

}

2887

2260

2888

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

2889

tempdir = mkdtemp(run_tempdir);

2890

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

2891

if(debug){

2892

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

2893

run_tempdir, old_tempdir);

2894

}

2895

tempdir = mkdtemp(old_tempdir);

2896

}

2897

if(tempdir == NULL){

2261

if(mkdtemp(tempdir) == NULL){

2898

2262

perror_plus("mkdtemp");

2899

2263

goto end;

2900

2264

}

2265

tempdir_created = true;

2901

2266

2902

2267

if(quit_now){

2903

2268

goto end;

2978

2343

sleep((unsigned int)retry_interval);

2979

2344

}

2980

2345

2981

if(not quit_now){

2346

if (not quit_now){

2982

2347

exitcode = EXIT_SUCCESS;

2983

2348

}

2984

2349

3000

2365

3001

2366

/* Allocate a new server */

3002

2367

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3003

&config, NULL, NULL, &ret);

2368

&config, NULL, NULL, &ret_errno);

3004

2369

3005

2370

/* Free the Avahi configuration data */

3006

2371

avahi_server_config_free(&config);

3009

2374

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

3010

2375

if(mc.server == NULL){

3011

2376

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

3012

avahi_strerror(ret));

2377

avahi_strerror(ret_errno));

3013

2378

exitcode = EX_UNAVAILABLE;

3014

2379

goto end;

3015

2380

}

3039

2404

if(debug){

3040

2405

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

3041

2406

}

3042

2407

3043

2408

ret = avahi_loop_with_timeout(simple_poll,

3044

2409

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

3045

2410

if(debug){

3050

2415

end:

3051

2416

3052

2417

if(debug){

3053

if(signal_received){

3054

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

3055

argv[0], signal_received,

3056

strsignal(signal_received));

3057

} else {

3058

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

3059

}

2418

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

3060

2419

}

3061

2420

3062

2421

/* Cleanup things */

3073

2432

3074

2433

if(gnutls_initialized){

3075

2434

gnutls_certificate_free_credentials(mc.cred);

2435

gnutls_global_deinit();

3076

2436

gnutls_dh_params_deinit(mc.dh_params);

3077

2437

}

3078

2438

3086

2446

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

3087

2447

while(mc.current_server != NULL){

3088

2448

server *next = mc.current_server->next;

3089

#ifdef __GNUC__

3090

#pragma GCC diagnostic push

3091

#pragma GCC diagnostic ignored "-Wcast-qual"

3092

#endif

3093

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

3094

#ifdef __GNUC__

3095

#pragma GCC diagnostic pop

3096

#endif

3097

2449

free(mc.current_server);

3098

2450

mc.current_server = next;

3099

2451

}

3100

2452

}

3101

2453

3102

/* Re-raise privileges */

2454

/* Re-raise priviliges */

3103

2455

{

3104

ret = raise_privileges();

3105

if(ret != 0){

3106

errno = ret;

3107

perror_plus("Failed to raise privileges");

3108

} else {

3109

3110

/* Run network hooks */

3111

run_network_hooks("stop", interfaces_hooks != NULL ?

3112

interfaces_hooks : "", delay);

3113

3114

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

3115

{

3116

char *interface = NULL;

3117

while((interface = argz_next(interfaces_to_take_down,

3118

interfaces_to_take_down_size,

3119

interface))){

3120

ret = take_down_interface(interface);

3121

if(ret != 0){

3122

errno = ret;

3123

perror_plus("Failed to take down interface");

3124

}

3125

}

3126

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

3127

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

3128

" down\n");

3129

}

3130

}

3131

}

3132

3133

ret = lower_privileges_permanently();

3134

if(ret != 0){

3135

errno = ret;

3136

perror_plus("Failed to lower privileges permanently");

3137

}

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();

3138

2481

}

3139

2482

3140

2483

free(interfaces_to_take_down);

3141

2484

free(interfaces_hooks);

3142

2485

3143

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

3144

uintmax_t level){

2486

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

2487

if(tempdir_created){

3145

2488

struct dirent **direntries = NULL;

3146

int dret;

3147

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

3148

O_RDONLY

3149

| O_NOFOLLOW

3150

| O_DIRECTORY

3151

| O_PATH));

3152

if(dir_fd == -1){

3153

perror_plus("open");

3154

return;

3155

}

3156

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

3157

notdotentries, alphasort);

3158

if(numentries >= 0){

2489

struct dirent *direntry = NULL;

2490

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

2491

alphasort);

2492

if (numentries > 0){

3159

2493

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

3160

if(debug){

3161

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

3162

dirname, direntries[i]->d_name);

3163

}

3164

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

3165

if(dret == -1){

3166

if(errno == EISDIR){

3167

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

3168

AT_REMOVEDIR);

3169

}

3170

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

3171

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

3172

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

3173

/* Recurse only in this special case */

3174

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

3175

dret = 0;

3176

}

3177

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

3178

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

3179

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

3180

}

3181

}

3182

free(direntries[i]);

3183

}

3184

3185

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

3186

free(direntries);

3187

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3188

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

3189

perror_plus("rmdir");

3190

}

3191

} else {

3192

perror_plus("scandirat");

3193

}

3194

close(dir_fd);

3195

}

3196

3197

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

3198

if(tempdir != NULL){

3199

clean_dir_at(-1, tempdir, 0);

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

}

3200

2520

}

3201

2521

3202

2522

if(quit_now){