/mandos/trunk : revision 609

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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 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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30

*/

33

32

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

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#ifndef _LARGEFILE_SOURCE

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34

#define _LARGEFILE_SOURCE

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#endif /* not _LARGEFILE_SOURCE */

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#endif

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36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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#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 */

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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(),

81

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() */

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

85

77

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

86

78

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

87

79

argp_state, struct argp,

99

91

argz_delete(), argz_append(),

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92

argz_stringify(), argz_add(),

101

93

argz_count() */

102

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

103

EAI_SYSTEM, gai_strerror() */

104

94

105

95

#ifdef __linux__

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96

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

148

138

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

149

139

char *connect_to = NULL;

150

140

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

152

141

uid_t uid = 65534;

153

142

gid_t gid = 65534;

154

143

191

180

perror(print_text);

192

181

}

193

182

194

__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);

198

187

199

188

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

200

189

program_invocation_short_name));

201

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

190

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

202

191

}

203

192

204

193

/*

206

195

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

207

196

* "buffer_length" is how much is already used.

208

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){

213

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

214

if(new_buf == NULL){

215

int old_errno = errno;

216

free(*buffer);

217

errno = old_errno;

218

*buffer = NULL;

201

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

202

if(buffer == NULL){

219

203

return 0;

220

204

}

221

*buffer = new_buf;

222

205

buffer_capacity += BUFFER_SIZE;

223

206

}

224

207

return buffer_capacity;

225

208

}

226

209

227

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

228

__attribute__((nonnull, warn_unused_result))

229

211

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

230

212

int af, server **current_server){

231

213

int ret;

240

222

.af = af };

241

223

if(new_server->ip == NULL){

242

224

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");

249

#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);

258

225

return false;

259

226

}

260

227

/* Special case of first server */

262

229

new_server->next = new_server;

263

230

new_server->prev = new_server;

264

231

*current_server = new_server;

232

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

265

233

} else {

266

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

267

234

new_server->next = *current_server;

268

235

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

269

236

new_server->prev->next = new_server;

270

237

(*current_server)->prev = new_server;

271

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

272

244

return true;

273

245

}

274

246

275

247

/*

276

248

* Initialize GPGME.

277

249

*/

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){

250

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

251

const char *tempdir, mandos_context *mc){

283

252

gpgme_error_t rc;

284

253

gpgme_engine_info_t engine_info;

285

254

286

255

/*

287

256

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

288

257

*/

289

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

290

259

int ret;

291

260

int fd;

292

261

gpgme_data_t pgp_data;

310

279

gpgme_strsource(rc), gpgme_strerror(rc));

311

280

return false;

312

281

}

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

282

389

ret = close(fd);

283

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

390

284

if(ret == -1){

391

285

perror_plus("close");

392

286

}

431

325

/* Create new GPGME "context" */

432

326

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

433

327

if(rc != GPG_ERR_NO_ERROR){

434

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

435

gpgme_strsource(rc), gpgme_strerror(rc));

328

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

329

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

330

gpgme_strerror(rc));

436

331

return false;

437

332

}

438

333

447

342

* Decrypt OpenPGP data.

448

343

* Returns -1 on error

449

344

*/

450

__attribute__((nonnull, warn_unused_result))

451

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

452

346

size_t crypto_size,

453

347

char **plaintext,

474

368

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

475

369

rc = gpgme_data_new(&dh_plain);

476

370

if(rc != GPG_ERR_NO_ERROR){

477

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

371

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

372

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

478

373

gpgme_strsource(rc), gpgme_strerror(rc));

479

374

gpgme_data_release(dh_crypto);

480

375

return -1;

493

388

if(result == NULL){

494

389

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

495

390

} 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");

391

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

392

result->unsupported_algorithm);

393

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

394

result->wrong_key_usage);

502

395

if(result->file_name != NULL){

503

396

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

504

397

}

574

467

return plaintext_length;

575

468

}

576

469

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){

470

static const char * safer_gnutls_strerror(int value){

586

471

const char *ret = gnutls_strerror(value);

587

return safe_string(ret);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

588

475

}

589

476

590

477

/* GnuTLS log function callback */

591

__attribute__((nonnull))

592

478

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

593

479

const char* string){

594

480

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

595

481

}

596

482

597

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

598

483

static int init_gnutls_global(const char *pubkeyfilename,

599

484

const char *seckeyfilename,

600

const char *dhparamsfilename,

601

485

mandos_context *mc){

602

486

int ret;

603

unsigned int uret;

604

487

605

488

if(debug){

606

489

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

607

490

}

608

491

492

ret = gnutls_global_init();

493

if(ret != GNUTLS_E_SUCCESS){

494

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

495

safer_gnutls_strerror(ret));

496

return -1;

497

}

498

609

499

if(debug){

610

500

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

611

501

* - GnuTLS manual

619

509

if(ret != GNUTLS_E_SUCCESS){

620

510

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

621

511

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

622

513

return -1;

623

514

}

624

515

649

540

safer_gnutls_strerror(ret));

650

541

goto globalfail;

651

542

}

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

}

543

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

544

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

547

goto globalfail;

548

}

549

829

550

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

830

551

831

552

return 0;

833

554

globalfail:

834

555

835

556

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

836

558

gnutls_dh_params_deinit(mc->dh_params);

837

559

return -1;

838

560

}

839

561

840

__attribute__((nonnull, warn_unused_result))

841

562

static int init_gnutls_session(gnutls_session_t *session,

842

563

mandos_context *mc){

843

564

int ret;

890

611

/* ignore client certificate if any. */

891

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

892

613

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

893

616

return 0;

894

617

}

895

618

897

620

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

898

621

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

899

622

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

623

/* Called when a Mandos server is found */

1119

__attribute__((nonnull, warn_unused_result))

1120

624

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

1121

625

AvahiIfIndex if_index,

1122

626

int af, mandos_context *mc){

1123

627

int ret, tcp_sd = -1;

1124

628

ssize_t sret;

1125

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1126

633

char *buffer = NULL;

1127

634

char *decrypted_buffer = NULL;

1128

635

size_t buffer_length = 0;

1131

638

int retval = -1;

1132

639

gnutls_session_t session;

1133

640

int pf; /* Protocol family */

1134

bool route_added = false;

1135

641

1136

642

errno = 0;

1137

643

1159

665

bool match = false;

1160

666

{

1161

667

char *interface = NULL;

1162

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

1163

mc->interfaces_size,

1164

interface))){

668

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

669

interface))){

1165

670

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

1166

671

match = true;

1167

672

break;

1196

701

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

1197

702

}

1198

703

1199

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

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1200

705

if(tcp_sd < 0){

1201

706

int e = errno;

1202

707

perror_plus("socket");

1209

714

goto mandos_end;

1210

715

}

1211

716

717

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

1212

718

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);

719

to.in6.sin6_family = (sa_family_t)af;

720

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

1216

721

} 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);

722

to.in.sin_family = (sa_family_t)af;

723

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

1220

724

}

1221

725

if(ret < 0 ){

1222

726

int e = errno;

1231

735

goto mandos_end;

1232

736

}

1233

737

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)){

738

to.in6.sin6_port = htons(port);

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

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

741

-Wunreachable-code*/

1237

742

if(if_index == AVAHI_IF_UNSPEC){

1238

743

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

1239

744

" incomplete without a network interface\n");

1241

746

goto mandos_end;

1242

747

}

1243

748

/* Set the network interface number as scope */

1244

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

749

to.in6.sin6_scope_id = (uint32_t)if_index;

1245

750

}

1246

751

} else {

1247

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

752

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

753

-Wconversion and

754

-Wunreachable-code */

1248

755

}

1249

756

1250

757

if(quit_now){

1267

774

}

1268

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1269

776

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;

777

const char *pcret;

778

if(af == AF_INET6){

779

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

780

sizeof(addrstr));

781

} else {

782

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

783

sizeof(addrstr));

784

}

785

if(pcret == NULL){

786

perror_plus("inet_ntop");

787

} else {

788

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

789

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

790

}

791

}

792

}

793

794

if(quit_now){

795

errno = EINTR;

796

goto mandos_end;

797

}

798

799

if(af == AF_INET6){

800

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

801

} else {

802

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

803

}

804

if(ret < 0){

805

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

806

int e = errno;

807

perror_plus("connect");

808

errno = e;

809

}

810

goto mandos_end;

811

}

812

813

if(quit_now){

814

errno = EINTR;

815

goto mandos_end;

1350

816

}

1351

817

1352

818

const char *out = mandos_protocol_version;

1506

972

&decrypted_buffer, mc);

1507

973

if(decrypted_buffer_size >= 0){

1508

974

1509

clearerr(stdout);

1510

975

written = 0;

1511

976

while(written < (size_t) decrypted_buffer_size){

1512

977

if(quit_now){

1528

993

}

1529

994

written += (size_t)ret;

1530

995

}

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

996

retval = 0;

1542

997

}

1543

998

}

1546

1001

1547

1002

mandos_end:

1548

1003

{

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

1004

int e = errno;

1556

1005

free(decrypted_buffer);

1557

1006

free(buffer);

1558

1007

if(tcp_sd >= 0){

1559

ret = close(tcp_sd);

1008

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

1560

1009

}

1561

1010

if(ret == -1){

1562

1011

if(e == 0){

1587

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

1588

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1589

1038

flags,

1590

void *mc){

1039

void* mc){

1591

1040

if(r == NULL){

1592

1041

return;

1593

1042

}

1596

1045

timed out */

1597

1046

1598

1047

if(quit_now){

1599

avahi_s_service_resolver_free(r);

1600

1048

return;

1601

1049

}

1602

1050

1647

1095

const char *domain,

1648

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1649

1097

flags,

1650

void *mc){

1098

void* mc){

1651

1099

if(b == NULL){

1652

1100

return;

1653

1101

}

1713

1161

errno = old_errno;

1714

1162

}

1715

1163

1716

__attribute__((nonnull, warn_unused_result))

1717

1164

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

1718

1165

int ret;

1719

int old_errno;

1166

error_t ret_errno;

1720

1167

1721

1168

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

1722

1169

if(s < 0){

1723

old_errno = errno;

1170

ret_errno = errno;

1724

1171

perror_plus("socket");

1725

errno = old_errno;

1172

errno = ret_errno;

1726

1173

return false;

1727

1174

}

1728

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

1729

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

1175

strcpy(ifr->ifr_name, ifname);

1730

1176

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1731

1177

if(ret == -1){

1732

1178

if(debug){

1733

old_errno = errno;

1179

ret_errno = errno;

1734

1180

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;

1181

errno = ret_errno;

1741

1182

}

1742

1183

return false;

1743

1184

}

1744

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

1745

old_errno = errno;

1746

perror_plus("close");

1747

errno = old_errno;

1748

}

1749

1185

return true;

1750

1186

}

1751

1187

1752

__attribute__((nonnull, warn_unused_result))

1753

1188

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

1754

1189

1755

1190

/* Reject the loopback device */

1797

1232

* corresponds to an acceptable network device.

1798

1233

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

1799

1234

*/

1800

__attribute__((nonnull, warn_unused_result))

1801

1235

int good_interface(const struct dirent *if_entry){

1802

1236

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

1803

1237

return 0;

1821

1255

/*

1822

1256

* This function determines if a network interface is up.

1823

1257

*/

1824

__attribute__((nonnull, warn_unused_result))

1825

1258

bool interface_is_up(const char *interface){

1826

1259

struct ifreq ifr;

1827

1260

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

1838

1271

/*

1839

1272

* This function determines if a network interface is running

1840

1273

*/

1841

__attribute__((nonnull, warn_unused_result))

1842

1274

bool interface_is_running(const char *interface){

1843

1275

struct ifreq ifr;

1844

1276

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

1852

1284

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

1853

1285

}

1854

1286

1855

__attribute__((nonnull, pure, warn_unused_result))

1856

1287

int notdotentries(const struct dirent *direntry){

1857

1288

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

1858

1289

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

1865

1296

}

1866

1297

1867

1298

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

1868

__attribute__((nonnull, warn_unused_result))

1869

1299

int runnable_hook(const struct dirent *direntry){

1870

1300

int ret;

1871

1301

size_t sret;

1879

1309

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

1880

1310

"abcdefghijklmnopqrstuvwxyz"

1881

1311

"0123456789"

1882

"_.-");

1312

"_-");

1883

1313

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

1884

1314

/* Contains non-allowed characters */

1885

1315

if(debug){

1889

1319

return 0;

1890

1320

}

1891

1321

1892

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

1322

char *fullname = NULL;

1323

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

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

1893

1330

if(ret == -1){

1894

1331

if(debug){

1895

1332

perror_plus("Could not stat hook");

1919

1356

return 1;

1920

1357

}

1921

1358

1922

__attribute__((nonnull, warn_unused_result))

1923

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1924

1360

mandos_context *mc){

1925

1361

int ret;

1929

1365

1930

1366

while(true){

1931

1367

if(mc->current_server == NULL){

1932

if(debug){

1368

if (debug){

1933

1369

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

1934

1370

" No timeout!\n");

1935

1371

}

1936

1372

ret = avahi_simple_poll_iterate(s, -1);

1937

1373

} else {

1938

if(debug){

1374

if (debug){

1939

1375

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

1940

1376

" it, or wait\n");

1941

1377

}

1958

1394

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

1959

1395

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

1960

1396

1961

if(debug){

1397

if (debug){

1962

1398

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

1963

1399

block_time);

1964

1400

}

1986

1422

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

1987

1423

}

1988

1424

if(ret != 0){

1989

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

1425

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

1990

1426

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

1991

1427

}

1992

1428

}

1993

1429

}

1994

1430

}

1995

1431

1996

__attribute__((nonnull))

1997

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

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1998

1485

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);

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

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

1490

alphasort);

2022

1491

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);

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

2034

1499

}

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){

1500

} else {

1501

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

1502

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

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

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

1506

if(ret < 0){

2081

1507

perror_plus("asprintf");

2082

_exit(EX_OSERR);

2083

}

2084

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

2085

if(ret == -1){

1508

continue;

1509

}

1510

if(debug){

1511

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

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

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

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

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

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

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

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

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

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

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

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

2086

1566

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;

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

2155

1578

} 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);

1579

int status;

1580

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

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

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

1588

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

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

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

1595

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

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

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

1601

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

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

2175

1615

}

2176

1616

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;

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

2182

1623

struct ifreq network;

2183

1624

unsigned int if_index = if_nametoindex(interface);

2184

1625

if(if_index == 0){

2193

1634

}

2194

1635

2195

1636

if(not interface_is_up(interface)){

2196

int ret_errno = 0;

2197

int ioctl_errno = 0;

2198

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

1637

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

2199

1638

ret_errno = errno;

2200

1639

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

2201

1640

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

2202

errno = old_errno;

2203

1641

return ret_errno;

2204

1642

}

2205

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

1643

network.ifr_flags |= IFF_UP;

2206

1644

2207

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

2208

if(sd == -1){

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

2209

1647

ret_errno = errno;

2210

1648

perror_plus("socket");

2211

1649

errno = old_errno;

2212

1650

return ret_errno;

2213

1651

}

2214

1652

2215

1653

if(quit_now){

2216

ret = close(sd);

2217

if(ret == -1){

2218

perror_plus("close");

2219

}

1654

close(sd);

2220

1655

errno = old_errno;

2221

1656

return EINTR;

2222

1657

}

2226

1661

interface);

2227

1662

}

2228

1663

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

}

1664

/* Raise priviliges */

1665

raise_privileges();

2235

1666

2236

1667

#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

}

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

2248

1675

}

2249

1676

#endif /* __linux__ */

2250

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

2251

ioctl_errno = errno;

1677

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

1678

ret_errno = errno;

2252

1679

#ifdef __linux__

2253

1680

if(restore_loglevel){

2254

1681

ret_linux = klogctl(7, NULL, 0);

2258

1685

}

2259

1686

#endif /* __linux__ */

2260

1687

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

}

1688

/* Lower privileges */

1689

lower_privileges();

2270

1690

2271

1691

/* Close the socket */

2272

ret = close(sd);

1692

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

2273

1693

if(ret == -1){

2274

1694

perror_plus("close");

2275

1695

}

2276

1696

2277

1697

if(ret_setflags == -1){

2278

errno = ioctl_errno;

1698

errno = ret_errno;

2279

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2280

1700

errno = old_errno;

2281

return ioctl_errno;

1701

return ret_errno;

2282

1702

}

2283

1703

} else if(debug){

2284

1704

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

2287

1707

2288

1708

/* Sleep checking until interface is running.

2289

1709

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

2290

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

1710

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

2291

1711

if(interface_is_running(interface)){

2292

1712

break;

2293

1713

}

2302

1722

return 0;

2303

1723

}

2304

1724

2305

__attribute__((nonnull, warn_unused_result))

2306

int take_down_interface(const char *const interface){

2307

int old_errno = errno;

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

2308

1730

struct ifreq network;

2309

1731

unsigned int if_index = if_nametoindex(interface);

2310

1732

if(if_index == 0){

2313

1735

return ENXIO;

2314

1736

}

2315

1737

if(interface_is_up(interface)){

2316

int ret_errno = 0;

2317

int ioctl_errno = 0;

2318

1738

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

2319

1739

ret_errno = errno;

2320

1740

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

2321

1741

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

2322

errno = old_errno;

2323

1742

return ret_errno;

2324

1743

}

2325

1744

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

2326

1745

2327

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

2328

if(sd == -1){

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

2329

1748

ret_errno = errno;

2330

1749

perror_plus("socket");

2331

1750

errno = old_errno;

2337

1756

interface);

2338

1757

}

2339

1758

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

}

2346

2347

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

2348

ioctl_errno = errno;

2349

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

}

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

2359

1767

2360

1768

/* Close the socket */

2361

int ret = close(sd);

1769

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

2362

1770

if(ret == -1){

2363

1771

perror_plus("close");

2364

1772

}

2365

1773

2366

1774

if(ret_setflags == -1){

2367

errno = ioctl_errno;

1775

errno = ret_errno;

2368

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2369

1777

errno = old_errno;

2370

return ioctl_errno;

1778

return ret_errno;

2371

1779

}

2372

1780

} else if(debug){

2373

1781

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

2379

1787

}

2380

1788

2381

1789

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 };

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

2387

1794

AvahiSServiceBrowser *sb = NULL;

2388

1795

error_t ret_errno;

2389

1796

int ret;

2392

1799

int exitcode = EXIT_SUCCESS;

2393

1800

char *interfaces_to_take_down = NULL;

2394

1801

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;

1802

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

1803

bool tempdir_created = false;

2398

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2399

1805

const char *seckey = PATHDIR "/" SECKEY;

2400

1806

const char *pubkey = PATHDIR "/" PUBKEY;

2401

const char *dh_params_file = NULL;

2402

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

2403

1809

2404

1810

bool gnutls_initialized = false;

2405

1811

bool gpgme_initialized = false;

2457

1863

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

2458

1864

" Diffie-Hellman key exchange",

2459

1865

.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

1866

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

2466

1867

.arg = "STRING",

2467

1868

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

2522

1923

}

2523

1924

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

2524

1925

break;

2525

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

2526

dh_params_file = arg;

2527

break;

2528

1926

case 130: /* --priority */

2529

1927

mc.priority = arg;

2530

1928

break;

2570

1968

.args_doc = "",

2571

1969

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

2572

1970

" 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){

1971

ret = argp_parse(&argp, argc, argv,

1972

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1973

switch(ret){

2576

1974

case 0:

2577

1975

break;

2578

1976

case ENOMEM:

2579

1977

default:

2580

errno = ret_errno;

1978

errno = ret;

2581

1979

perror_plus("argp_parse");

2582

1980

exitcode = EX_OSERR;

2583

1981

goto end;

2586

1984

goto end;

2587

1985

}

2588

1986

}

2589

1987

2590

1988

{

2591

1989

/* Work around Debian bug #633582:

2592

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

1990

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

2593

1991

2594

/* Re-raise privileges */

2595

ret = raise_privileges();

2596

if(ret != 0){

2597

errno = ret;

2598

perror_plus("Failed to raise privileges");

2599

} else {

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2600

1994

struct stat st;

2601

1995

2602

1996

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

2616

2010

}

2617

2011

}

2618

2012

}

2619

close(seckey_fd);

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2620

2014

}

2621

2015

}

2622

2016

2623

2017

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

2624

2018

int pubkey_fd = open(pubkey, O_RDONLY);

2625

2019

if(pubkey_fd == -1){

2637

2031

}

2638

2032

}

2639

2033

}

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

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2666

2038

/* Lower privileges */

2667

ret = lower_privileges();

2668

if(ret != 0){

2669

errno = ret;

2670

perror_plus("Failed to lower privileges");

2671

}

2039

lower_privileges();

2672

2040

}

2673

2041

}

2674

2042

2698

2066

goto end;

2699

2067

}

2700

2068

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

2701

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

2702

}

2703

run_network_hooks("start", interfaces_hooks != NULL ?

2704

interfaces_hooks : "", delay);

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

2705

2077

}

2706

2078

2707

2079

if(not debug){

2785

2157

2786

2158

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

2787

2159

if(mc.interfaces == NULL){

2788

struct dirent **direntries = NULL;

2160

struct dirent **direntries;

2789

2161

/* Look for any good interfaces */

2790

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2791

2163

alphasort);

2795

2167

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

2796

2168

direntries[i]->d_name);

2797

2169

if(ret_errno != 0){

2798

errno = ret_errno;

2799

2170

perror_plus("argz_add");

2800

free(direntries[i]);

2801

2171

continue;

2802

2172

}

2803

2173

if(debug){

2804

2174

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

2805

2175

direntries[i]->d_name);

2806

2176

}

2807

free(direntries[i]);

2808

2177

}

2809

2178

free(direntries);

2810

2179

} else {

2811

if(ret == 0){

2812

free(direntries);

2813

}

2180

free(direntries);

2814

2181

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

2815

2182

exitcode = EXIT_FAILURE;

2816

2183

goto end;

2839

2206

break;

2840

2207

}

2841

2208

bool interface_was_up = interface_is_up(interface);

2842

errno = bring_up_interface(interface, delay);

2209

ret = bring_up_interface(interface, delay);

2843

2210

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));

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2847

2214

} else {

2848

errno = argz_add(&interfaces_to_take_down,

2849

&interfaces_to_take_down_size,

2850

interface);

2851

if(errno != 0){

2852

perror_plus("argz_add");

2853

}

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2854

2218

}

2855

2219

}

2856

2220

}

2872

2236

goto end;

2873

2237

}

2874

2238

2875

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

2239

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

2876

2240

if(ret == -1){

2877

2241

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

2878

2242

exitcode = EX_UNAVAILABLE;

2885

2249

goto end;

2886

2250

}

2887

2251

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){

2252

if(mkdtemp(tempdir) == NULL){

2898

2253

perror_plus("mkdtemp");

2899

2254

goto end;

2900

2255

}

2256

tempdir_created = true;

2901

2257

2902

2258

if(quit_now){

2903

2259

goto end;

2975

2331

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

2976

2332

(int)retry_interval);

2977

2333

}

2978

sleep((unsigned int)retry_interval);

2334

sleep((int)retry_interval);

2979

2335

}

2980

2336

2981

if(not quit_now){

2337

if (not quit_now){

2982

2338

exitcode = EXIT_SUCCESS;

2983

2339

}

2984

2340

3000

2356

3001

2357

/* Allocate a new server */

3002

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3003

&config, NULL, NULL, &ret);

2359

&config, NULL, NULL, &ret_errno);

3004

2360

3005

2361

/* Free the Avahi configuration data */

3006

2362

avahi_server_config_free(&config);

3009

2365

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

3010

2366

if(mc.server == NULL){

3011

2367

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

3012

avahi_strerror(ret));

2368

avahi_strerror(ret_errno));

3013

2369

exitcode = EX_UNAVAILABLE;

3014

2370

goto end;

3015

2371

}

3039

2395

if(debug){

3040

2396

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

3041

2397

}

3042

2398

3043

2399

ret = avahi_loop_with_timeout(simple_poll,

3044

2400

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

3045

2401

if(debug){

3050

2406

end:

3051

2407

3052

2408

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

}

2409

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

3060

2410

}

3061

2411

3062

2412

/* Cleanup things */

3073

2423

3074

2424

if(gnutls_initialized){

3075

2425

gnutls_certificate_free_credentials(mc.cred);

2426

gnutls_global_deinit();

3076

2427

gnutls_dh_params_deinit(mc.dh_params);

3077

2428

}

3078

2429

3086

2437

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

3087

2438

while(mc.current_server != NULL){

3088

2439

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

2440

free(mc.current_server);

3098

2441

mc.current_server = next;

3099

2442

}

3100

2443

}

3101

2444

3102

/* Re-raise privileges */

2445

/* Re-raise priviliges */

3103

2446

{

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

}

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2463

}

2464

}

2465

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

2466

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

2467

" down\n");

2468

}

2469

}

2470

2471

lower_privileges_permanently();

3138

2472

}

3139

2473

3140

2474

free(interfaces_to_take_down);

3141

2475

free(interfaces_hooks);

3142

2476

3143

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

3144

uintmax_t level){

2477

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

2478

if(tempdir_created){

3145

2479

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){

2480

struct dirent *direntry = NULL;

2481

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

2482

alphasort);

2483

if (numentries > 0){

3159

2484

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);

2485

direntry = direntries[i];

2486

char *fullname = NULL;

2487

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

2488

direntry->d_name);

2489

if(ret < 0){

2490

perror_plus("asprintf");

2491

continue;

2492

}

2493

ret = remove(fullname);

2494

if(ret == -1){

2495

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

2496

strerror(errno));

2497

}

2498

free(fullname);

2499

}

2500

}

2501

2502

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

2503

free(direntries);

2504

if (numentries == -1){

2505

perror_plus("scandir");

2506

}

2507

ret = rmdir(tempdir);

2508

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

2509

perror_plus("rmdir");

2510

}

3200

2511

}

3201

2512

3202

2513

if(quit_now){