/mandos/release : revision 237.7.455

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

10

*

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* Everything else is

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*

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

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

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

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

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*

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

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13

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*

15

* This file is part of Mandos.

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*

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

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

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

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* (at your option) any later version.

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*

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

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* WITHOUT ANY WARRANTY; without even the implied warranty of

22

24

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

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25

* General Public License for more details.

24

26

*

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27

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

26

* along with this program. If not, see

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

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

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*

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

30

31

*/

32

33

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

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34

#ifndef _LARGEFILE_SOURCE

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35

#define _LARGEFILE_SOURCE

35

#endif

36

#endif /* not _LARGEFILE_SOURCE */

36

37

#ifndef _FILE_OFFSET_BITS

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38

#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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40

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

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42

43

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

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stdout, ferror(), remove() */

44

stdout, ferror() */

44

45

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

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46

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

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47

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

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48

strtof(), abort() */

48

49

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

49

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

50

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

50

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

51

asprintf(), strncpy(), strsignal()

52

*/

51

53

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

52

54

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

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55

sockaddr_in6, PF_INET6,

55

57

opendir(), DIR */

56

58

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

57

59

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

58

inet_pton(), connect() */

59

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

60

inet_pton(), connect(),

61

getnameinfo() */

62

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

60

63

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

61

64

*/

62

65

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

63

66

strtoimax() */

64

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

65

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

67

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

66

72

program_invocation_short_name */

67

73

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

68

74

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

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79

*/

74

80

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

75

81

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

76

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

77

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

82

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

83

unlinkat() */

84

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

78

85

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

79

86

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

80

87

argp_state, struct argp,

92

99

argz_delete(), argz_append(),

93

100

argz_stringify(), argz_add(),

94

101

argz_count() */

102

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

103

EAI_SYSTEM, gai_strerror() */

95

104

96

105

#ifdef __linux__

97

106

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

139

148

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

140

149

char *connect_to = NULL;

141

150

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

142

152

uid_t uid = 65534;

143

153

gid_t gid = 65534;

144

154

145

155

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

146

156

typedef struct server{

147

157

const char *ip;

148

uint16_t port;

158

in_port_t port;

149

159

AvahiIfIndex if_index;

150

160

int af;

151

161

struct timespec last_seen;

155

165

156

166

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

157

167

typedef struct {

158

AvahiSimplePoll *simple_poll;

159

168

AvahiServer *server;

160

169

gnutls_certificate_credentials_t cred;

161

170

unsigned int dh_bits;

163

172

const char *priority;

164

173

gpgme_ctx_t ctx;

165

174

server *current_server;

175

char *interfaces;

176

size_t interfaces_size;

166

177

} mandos_context;

167

178

168

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

169

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

170

.dh_bits = 1024, .priority = "SECURE256"

171

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

172

.current_server = NULL };

179

/* global so signal handler can reach it*/

180

AvahiSimplePoll *simple_poll;

173

181

174

182

sig_atomic_t quit_now = 0;

175

183

int signal_received = 0;

183

191

perror(print_text);

184

192

}

185

193

186

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

194

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

187

195

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

188

196

va_list ap;

189

197

va_start (ap, format);

190

198

191

199

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

192

200

program_invocation_short_name));

193

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

201

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

194

202

}

195

203

196

204

/*

198

206

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

199

207

* "buffer_length" is how much is already used.

200

208

*/

209

__attribute__((nonnull, warn_unused_result))

201

210

size_t incbuffer(char **buffer, size_t buffer_length,

202

211

size_t buffer_capacity){

203

212

if(buffer_length + BUFFER_SIZE > buffer_capacity){

204

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

205

if(buffer == NULL){

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;

206

219

return 0;

207

220

}

221

*buffer = new_buf;

208

222

buffer_capacity += BUFFER_SIZE;

209

223

}

210

224

return buffer_capacity;

211

225

}

212

226

213

227

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

214

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

215

int af){

228

__attribute__((nonnull, warn_unused_result))

229

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

230

int af, server **current_server){

216

231

int ret;

217

232

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

218

233

if(new_server == NULL){

225

240

.af = af };

226

241

if(new_server->ip == NULL){

227

242

perror_plus("strdup");

243

free(new_server);

244

return false;

245

}

246

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

247

if(ret == -1){

248

perror_plus("clock_gettime");

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);

228

258

return false;

229

259

}

230

260

/* Special case of first server */

231

if (mc.current_server == NULL){

261

if(*current_server == NULL){

232

262

new_server->next = new_server;

233

263

new_server->prev = new_server;

234

mc.current_server = new_server;

235

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

264

*current_server = new_server;

236

265

} else {

237

new_server->next = mc.current_server;

238

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

266

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

267

new_server->next = *current_server;

268

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

239

269

new_server->prev->next = new_server;

240

mc.current_server->prev = new_server;

241

}

242

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

243

if(ret == -1){

244

perror_plus("clock_gettime");

245

return false;

270

(*current_server)->prev = new_server;

246

271

}

247

272

return true;

248

273

}

250

275

/*

251

276

* Initialize GPGME.

252

277

*/

253

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

254

const char *tempdir){

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

283

gpgme_error_t rc;

256

284

gpgme_engine_info_t engine_info;

257

285

258

259

286

/*

260

287

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

261

288

*/

262

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

263

290

int ret;

264

291

int fd;

265

292

gpgme_data_t pgp_data;

277

304

return false;

278

305

}

279

306

280

rc = gpgme_op_import(mc.ctx, pgp_data);

307

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

281

308

if(rc != GPG_ERR_NO_ERROR){

282

309

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

283

310

gpgme_strsource(rc), gpgme_strerror(rc));

284

311

return false;

285

312

}

286

313

287

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

314

ret = close(fd);

288

315

if(ret == -1){

289

316

perror_plus("close");

290

317

}

327

354

}

328

355

329

356

/* Create new GPGME "context" */

330

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

357

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

331

358

if(rc != GPG_ERR_NO_ERROR){

332

359

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

333

360

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

346

373

* Decrypt OpenPGP data.

347

374

* Returns -1 on error

348

375

*/

376

__attribute__((nonnull, warn_unused_result))

349

377

static ssize_t pgp_packet_decrypt(const char *cryptotext,

350

378

size_t crypto_size,

351

char **plaintext){

379

char **plaintext,

380

mandos_context *mc){

352

381

gpgme_data_t dh_crypto, dh_plain;

353

382

gpgme_error_t rc;

354

383

ssize_t ret;

380

409

381

410

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

382

411

data buffer */

383

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

412

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

384

413

if(rc != GPG_ERR_NO_ERROR){

385

414

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

386

415

gpgme_strsource(rc), gpgme_strerror(rc));

387

416

plaintext_length = -1;

388

417

if(debug){

389

418

gpgme_decrypt_result_t result;

390

result = gpgme_op_decrypt_result(mc.ctx);

419

result = gpgme_op_decrypt_result(mc->ctx);

391

420

if(result == NULL){

392

421

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

393

422

} else {

470

499

return plaintext_length;

471

500

}

472

501

473

static const char * safer_gnutls_strerror(int value){

474

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

475

-Wunreachable-code */

476

if(ret == NULL)

477

ret = "(unknown)";

478

return ret;

502

__attribute__((warn_unused_result, const))

503

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

504

if(str == NULL)

505

return "(unknown)";

506

return str;

507

}

508

509

__attribute__((warn_unused_result))

510

static const char *safer_gnutls_strerror(int value){

511

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

479

513

}

480

514

481

515

/* GnuTLS log function callback */

516

__attribute__((nonnull))

482

517

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

483

518

const char* string){

484

519

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

485

520

}

486

521

522

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

487

523

static int init_gnutls_global(const char *pubkeyfilename,

488

const char *seckeyfilename){

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

mandos_context *mc){

489

527

int ret;

528

unsigned int uret;

490

529

491

530

if(debug){

492

531

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

493

532

}

494

533

495

ret = gnutls_global_init();

496

if(ret != GNUTLS_E_SUCCESS){

497

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

498

safer_gnutls_strerror(ret));

499

return -1;

500

}

501

502

534

if(debug){

503

535

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

504

536

* - GnuTLS manual

508

540

}

509

541

510

542

/* OpenPGP credentials */

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

512

544

if(ret != GNUTLS_E_SUCCESS){

513

545

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

514

546

safer_gnutls_strerror(ret));

515

gnutls_global_deinit();

516

547

return -1;

517

548

}

518

549

524

555

}

525

556

526

557

ret = gnutls_certificate_set_openpgp_key_file

527

(mc.cred, pubkeyfilename, seckeyfilename,

558

(mc->cred, pubkeyfilename, seckeyfilename,

528

559

GNUTLS_OPENPGP_FMT_BASE64);

529

560

if(ret != GNUTLS_E_SUCCESS){

530

561

fprintf_plus(stderr,

536

567

}

537

568

538

569

/* GnuTLS server initialization */

539

ret = gnutls_dh_params_init(&mc.dh_params);

570

ret = gnutls_dh_params_init(&mc->dh_params);

540

571

if(ret != GNUTLS_E_SUCCESS){

541

572

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

542

573

" initialization: %s\n",

543

574

safer_gnutls_strerror(ret));

544

575

goto globalfail;

545

576

}

546

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

547

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

550

goto globalfail;

551

}

552

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

577

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

578

if(dhparamsfilename != NULL){

579

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

580

do {

581

int dhpfile = open(dhparamsfilename, O_RDONLY);

582

if(dhpfile == -1){

583

perror_plus("open");

584

dhparamsfilename = NULL;

585

break;

586

}

587

size_t params_capacity = 0;

588

while(true){

589

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

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

593

perror_plus("incbuffer");

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

597

break;

598

}

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

601

BUFFER_SIZE);

602

/* EOF */

603

if(bytes_read == 0){

604

break;

605

}

606

/* check bytes_read for failure */

607

if(bytes_read < 0){

608

perror_plus("read");

609

free(params.data);

610

params.data = NULL;

611

dhparamsfilename = NULL;

612

break;

613

}

614

params.size += (unsigned int)bytes_read;

615

}

616

if(params.data == NULL){

617

dhparamsfilename = NULL;

618

}

619

if(dhparamsfilename == NULL){

620

break;

621

}

622

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

623

GNUTLS_X509_FMT_PEM);

624

if(ret != GNUTLS_E_SUCCESS){

625

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

626

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

627

safer_gnutls_strerror(ret));

628

dhparamsfilename = NULL;

629

}

630

free(params.data);

631

} while(false);

632

}

633

if(dhparamsfilename == NULL){

634

if(mc->dh_bits == 0){

635

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

636

/* Try to read the private key file */

637

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

638

do {

639

int secfile = open(seckeyfilename, O_RDONLY);

640

if(secfile == -1){

641

perror_plus("open");

642

break;

643

}

644

size_t buffer_capacity = 0;

645

while(true){

646

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

647

(size_t)buffer.size,

648

(size_t)buffer_capacity);

649

if(buffer_capacity == 0){

650

perror_plus("incbuffer");

651

free(buffer.data);

652

buffer.data = NULL;

653

break;

654

}

655

ssize_t bytes_read = read(secfile,

656

buffer.data + buffer.size,

657

BUFFER_SIZE);

658

/* EOF */

659

if(bytes_read == 0){

660

break;

661

}

662

/* check bytes_read for failure */

663

if(bytes_read < 0){

664

perror_plus("read");

665

free(buffer.data);

666

buffer.data = NULL;

667

break;

668

}

669

buffer.size += (unsigned int)bytes_read;

670

}

671

close(secfile);

672

} while(false);

673

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

674

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

675

if(buffer.data != NULL){

676

{

677

gnutls_openpgp_privkey_t privkey = NULL;

678

ret = gnutls_openpgp_privkey_init(&privkey);

679

if(ret != GNUTLS_E_SUCCESS){

680

fprintf_plus(stderr, "Error initializing OpenPGP key"

681

" structure: %s",

682

safer_gnutls_strerror(ret));

683

free(buffer.data);

684

buffer.data = NULL;

685

} else {

686

ret = gnutls_openpgp_privkey_import

687

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

688

if(ret != GNUTLS_E_SUCCESS){

689

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

690

safer_gnutls_strerror(ret));

691

privkey = NULL;

692

}

693

free(buffer.data);

694

buffer.data = NULL;

695

if(privkey != NULL){

696

/* Use private key to suggest an appropriate

697

sec_param */

698

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

699

gnutls_openpgp_privkey_deinit(privkey);

700

if(debug){

701

fprintf_plus(stderr, "This OpenPGP key implies using"

702

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

703

safe_string(gnutls_sec_param_get_name

704

(sec_param)));

705

}

706

}

707

}

708

}

709

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

710

/* Err on the side of caution */

711

sec_param = GNUTLS_SEC_PARAM_ULTRA;

712

if(debug){

713

fprintf_plus(stderr, "Falling back to security parameter"

714

" \"%s\"\n",

715

safe_string(gnutls_sec_param_get_name

716

(sec_param)));

717

}

718

}

719

}

720

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

721

if(uret != 0){

722

mc->dh_bits = uret;

723

if(debug){

724

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

725

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

726

safe_string(gnutls_sec_param_get_name

727

(sec_param)),

728

mc->dh_bits);

729

}

730

} else {

731

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

732

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

733

safe_string(gnutls_sec_param_get_name

734

(sec_param)),

735

safer_gnutls_strerror(ret));

736

goto globalfail;

737

}

738

} else if(debug){

739

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

740

mc->dh_bits);

741

}

742

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

743

if(ret != GNUTLS_E_SUCCESS){

744

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

745

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

746

safer_gnutls_strerror(ret));

747

goto globalfail;

748

}

749

}

750

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

554

751

555

752

return 0;

556

753

557

754

globalfail:

558

755

559

gnutls_certificate_free_credentials(mc.cred);

560

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

756

gnutls_certificate_free_credentials(mc->cred);

757

gnutls_dh_params_deinit(mc->dh_params);

562

758

return -1;

563

759

}

564

760

565

static int init_gnutls_session(gnutls_session_t *session){

761

__attribute__((nonnull, warn_unused_result))

762

static int init_gnutls_session(gnutls_session_t *session,

763

mandos_context *mc){

566

764

int ret;

567

765

/* GnuTLS session creation */

568

766

do {

580

778

{

581

779

const char *err;

582

780

do {

583

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

781

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

584

782

if(quit_now){

585

783

gnutls_deinit(*session);

586

784

return -1;

597

795

598

796

do {

599

797

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

600

mc.cred);

798

mc->cred);

601

799

if(quit_now){

602

800

gnutls_deinit(*session);

603

801

return -1;

613

811

/* ignore client certificate if any. */

614

812

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

615

813

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

617

618

814

return 0;

619

815

}

620

816

622

818

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

623

819

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

624

820

821

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

822

__attribute__((warn_unused_result))

823

int raise_privileges(void){

824

int old_errno = errno;

825

int ret = 0;

826

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

827

ret = errno;

828

}

829

errno = old_errno;

830

return ret;

831

}

832

833

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

834

__attribute__((warn_unused_result))

835

int raise_privileges_permanently(void){

836

int old_errno = errno;

837

int ret = raise_privileges();

838

if(ret != 0){

839

errno = old_errno;

840

return ret;

841

}

842

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

843

ret = errno;

844

}

845

errno = old_errno;

846

return ret;

847

}

848

849

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

850

__attribute__((warn_unused_result))

851

int lower_privileges(void){

852

int old_errno = errno;

853

int ret = 0;

854

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

855

ret = errno;

856

}

857

errno = old_errno;

858

return ret;

859

}

860

861

/* Lower privileges permanently */

862

__attribute__((warn_unused_result))

863

int lower_privileges_permanently(void){

864

int old_errno = errno;

865

int ret = 0;

866

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

867

ret = errno;

868

}

869

errno = old_errno;

870

return ret;

871

}

872

873

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

874

__attribute__((nonnull, warn_unused_result))

875

static bool add_delete_local_route(const bool add,

876

const char *address,

877

AvahiIfIndex if_index){

878

int ret;

879

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

880

char add_arg[] = "add";

881

char delete_arg[] = "delete";

882

char debug_flag[] = "--debug";

883

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

884

if(pluginhelperdir == NULL){

885

if(debug){

886

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

887

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

888

}

889

return false;

890

}

891

892

char interface[IF_NAMESIZE];

893

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

894

perror_plus("if_indextoname");

895

return false;

896

}

897

898

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

899

if(devnull == -1){

900

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

901

return false;

902

}

903

pid_t pid = fork();

904

if(pid == 0){

905

/* Child */

906

/* Raise privileges */

907

errno = raise_privileges_permanently();

908

if(errno != 0){

909

perror_plus("Failed to raise privileges");

910

/* _exit(EX_NOPERM); */

911

} else {

912

/* Set group */

913

errno = 0;

914

ret = setgid(0);

915

if(ret == -1){

916

perror_plus("setgid");

917

_exit(EX_NOPERM);

918

}

919

/* Reset supplementary groups */

920

errno = 0;

921

ret = setgroups(0, NULL);

922

if(ret == -1){

923

perror_plus("setgroups");

924

_exit(EX_NOPERM);

925

}

926

}

927

ret = dup2(devnull, STDIN_FILENO);

928

if(ret == -1){

929

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

930

_exit(EX_OSERR);

931

}

932

ret = close(devnull);

933

if(ret == -1){

934

perror_plus("close");

935

_exit(EX_OSERR);

936

}

937

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

938

if(ret == -1){

939

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

940

_exit(EX_OSERR);

941

}

942

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

943

O_RDONLY

944

| O_DIRECTORY

945

| O_PATH

946

| O_CLOEXEC));

947

if(helperdir_fd == -1){

948

perror_plus("open");

949

_exit(EX_UNAVAILABLE);

950

}

951

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

952

helper, O_RDONLY));

953

if(helper_fd == -1){

954

perror_plus("openat");

955

close(helperdir_fd);

956

_exit(EX_UNAVAILABLE);

957

}

958

close(helperdir_fd);

959

#ifdef __GNUC__

960

#pragma GCC diagnostic push

961

#pragma GCC diagnostic ignored "-Wcast-qual"

962

#endif

963

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

964

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

965

interface, debug ? debug_flag : NULL, NULL },

966

environ) == -1){

967

#ifdef __GNUC__

968

#pragma GCC diagnostic pop

969

#endif

970

perror_plus("fexecve");

971

_exit(EXIT_FAILURE);

972

}

973

}

974

if(pid == -1){

975

perror_plus("fork");

976

return false;

977

}

978

int status;

979

pid_t pret = -1;

980

errno = 0;

981

do {

982

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

983

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

984

int errno_raising = 0;

985

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

986

errno_raising = errno;

987

perror_plus("Failed to raise privileges in order to"

988

" kill helper program");

989

}

990

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

991

perror_plus("kill");

992

}

993

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

994

perror_plus("Failed to lower privileges after killing"

995

" helper program");

996

}

997

return false;

998

}

999

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

1000

if(pret == -1){

1001

perror_plus("waitpid");

1002

return false;

1003

}

1004

if(WIFEXITED(status)){

1005

if(WEXITSTATUS(status) != 0){

1006

fprintf_plus(stderr, "Error: iprouteadddel exited"

1007

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

1008

return false;

1009

}

1010

return true;

1011

}

1012

if(WIFSIGNALED(status)){

1013

fprintf_plus(stderr, "Error: iprouteadddel died by"

1014

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

1015

return false;

1016

}

1017

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

1018

return false;

1019

}

1020

1021

__attribute__((nonnull, warn_unused_result))

1022

static bool add_local_route(const char *address,

1023

AvahiIfIndex if_index){

1024

if(debug){

1025

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

1026

}

1027

return add_delete_local_route(true, address, if_index);

1028

}

1029

1030

__attribute__((nonnull, warn_unused_result))

1031

static bool delete_local_route(const char *address,

1032

AvahiIfIndex if_index){

1033

if(debug){

1034

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

1035

}

1036

return add_delete_local_route(false, address, if_index);

1037

}

1038

625

1039

/* Called when a Mandos server is found */

626

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

1040

__attribute__((nonnull, warn_unused_result))

1041

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

627

1042

AvahiIfIndex if_index,

628

int af){

1043

int af, mandos_context *mc){

629

1044

int ret, tcp_sd = -1;

630

1045

ssize_t sret;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

1046

struct sockaddr_storage to;

635

1047

char *buffer = NULL;

636

1048

char *decrypted_buffer = NULL;

637

1049

size_t buffer_length = 0;

640

1052

int retval = -1;

641

1053

gnutls_session_t session;

642

1054

int pf; /* Protocol family */

1055

bool route_added = false;

643

1056

644

1057

errno = 0;

645

1058

661

1074

return -1;

662

1075

}

663

1076

664

ret = init_gnutls_session(&session);

1077

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

1078

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

1079

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

1080

bool match = false;

1081

{

1082

char *interface = NULL;

1083

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

1084

mc->interfaces_size,

1085

interface))){

1086

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

1087

match = true;

1088

break;

1089

}

1090

}

1091

}

1092

if(not match){

1093

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

1094

connect to the server */

1095

if(debug){

1096

char interface[IF_NAMESIZE];

1097

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

1098

perror_plus("if_indextoname");

1099

} else {

1100

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

1101

" \"%s\"\n",

1102

if_indextoname((unsigned int)if_index,

1103

interface));

1104

}

1105

}

1106

return -1;

1107

}

1108

}

1109

1110

ret = init_gnutls_session(&session, mc);

665

1111

if(ret != 0){

666

1112

return -1;

667

1113

}

668

1114

669

1115

if(debug){

670

1116

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

671

PRIu16 "\n", ip, port);

1117

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

672

1118

}

673

1119

674

tcp_sd = socket(pf, SOCK_STREAM, 0);

1120

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

675

1121

if(tcp_sd < 0){

676

1122

int e = errno;

677

1123

perror_plus("socket");

684

1130

goto mandos_end;

685

1131

}

686

1132

687

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

688

1133

if(af == AF_INET6){

689

to.in6.sin6_family = (sa_family_t)af;

690

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

1134

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

1135

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

1136

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

691

1137

} else { /* IPv4 */

692

to.in.sin_family = (sa_family_t)af;

693

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

1138

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

1139

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

1140

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

694

1141

}

695

1142

if(ret < 0 ){

696

1143

int e = errno;

705

1152

goto mandos_end;

706

1153

}

707

1154

if(af == AF_INET6){

708

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

709

-Wconversion and

710

-Wunreachable-code */

711

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

713

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

714

-Wunreachable-code*/

1155

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

1156

if(IN6_IS_ADDR_LINKLOCAL

1157

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

715

1158

if(if_index == AVAHI_IF_UNSPEC){

716

1159

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

717

1160

" incomplete without a network interface\n");

719

1162

goto mandos_end;

720

1163

}

721

1164

/* Set the network interface number as scope */

722

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

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

723

1166

}

724

1167

} else {

725

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

726

-Wconversion and

727

-Wunreachable-code */

1168

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

728

1169

}

729

1170

730

1171

if(quit_now){

738

1179

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

739

1180

perror_plus("if_indextoname");

740

1181

} else {

741

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

742

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

1182

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

1183

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

743

1184

}

744

1185

} else {

745

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

746

ip, port);

1186

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

1187

ip, (uintmax_t)port);

747

1188

}

748

1189

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

749

1190

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

const char *pcret;

751

if(af == AF_INET6){

752

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

753

sizeof(addrstr));

754

} else {

755

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

756

sizeof(addrstr));

757

}

758

if(pcret == NULL){

759

perror_plus("inet_ntop");

760

} else {

761

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

762

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

763

}

764

}

765

}

766

767

if(quit_now){

768

errno = EINTR;

769

goto mandos_end;

770

}

771

772

if(af == AF_INET6){

773

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

774

} else {

775

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

776

}

777

if(ret < 0){

778

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

779

int e = errno;

780

perror_plus("connect");

781

errno = e;

782

}

783

goto mandos_end;

784

}

785

786

if(quit_now){

787

errno = EINTR;

788

goto mandos_end;

1191

if(af == AF_INET6){

1192

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

1193

sizeof(struct sockaddr_in6),

1194

addrstr, sizeof(addrstr), NULL, 0,

1195

NI_NUMERICHOST);

1196

} else {

1197

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

1198

sizeof(struct sockaddr_in),

1199

addrstr, sizeof(addrstr), NULL, 0,

1200

NI_NUMERICHOST);

1201

}

1202

if(ret == EAI_SYSTEM){

1203

perror_plus("getnameinfo");

1204

} else if(ret != 0) {

1205

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

1206

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

1207

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

1208

}

1209

}

1210

1211

if(quit_now){

1212

errno = EINTR;

1213

goto mandos_end;

1214

}

1215

1216

while(true){

1217

if(af == AF_INET6){

1218

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

1219

sizeof(struct sockaddr_in6));

1220

} else {

1221

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

1222

sizeof(struct sockaddr_in));

1223

}

1224

if(ret < 0){

1225

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

1226

and if_index != AVAHI_IF_UNSPEC

1227

and connect_to == NULL

1228

and not route_added and

1229

((af == AF_INET6 and not

1230

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1231

&to)->sin6_addr)))

1232

or (af == AF_INET and

1233

/* Not a a IPv4LL address */

1234

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

1235

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

1236

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

1237

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

1238

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

1239

connect to a Mandos server announced by Avahi on a server

1240

host with a global address. Work around this by retrying

1241

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

1242

1243

Avahi bug reference:

1244

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

1245

https://bugs.debian.org/587961

1246

*/

1247

if(debug){

1248

fprintf_plus(stderr, "Mandos server unreachable, trying"

1249

" direct route\n");

1250

}

1251

int e = errno;

1252

route_added = add_local_route(ip, if_index);

1253

if(route_added){

1254

continue;

1255

}

1256

errno = e;

1257

}

1258

if(errno != ECONNREFUSED or debug){

1259

int e = errno;

1260

perror_plus("connect");

1261

errno = e;

1262

}

1263

goto mandos_end;

1264

}

1265

1266

if(quit_now){

1267

errno = EINTR;

1268

goto mandos_end;

1269

}

1270

break;

789

1271

}

790

1272

791

1273

const char *out = mandos_protocol_version;

942

1424

if(buffer_length > 0){

943

1425

ssize_t decrypted_buffer_size;

944

1426

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

945

&decrypted_buffer);

1427

&decrypted_buffer, mc);

946

1428

if(decrypted_buffer_size >= 0){

947

1429

1430

clearerr(stdout);

948

1431

written = 0;

949

1432

while(written < (size_t) decrypted_buffer_size){

950

1433

if(quit_now){

966

1449

}

967

1450

written += (size_t)ret;

968

1451

}

1452

ret = fflush(stdout);

1453

if(ret != 0){

1454

int e = errno;

1455

if(debug){

1456

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

1457

strerror(errno));

1458

}

1459

errno = e;

1460

goto mandos_end;

1461

}

969

1462

retval = 0;

970

1463

}

971

1464

}

974

1467

975

1468

mandos_end:

976

1469

{

1470

if(route_added){

1471

if(not delete_local_route(ip, if_index)){

1472

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

1473

" interface %d", ip, if_index);

1474

}

1475

}

977

1476

int e = errno;

978

1477

free(decrypted_buffer);

979

1478

free(buffer);

980

1479

if(tcp_sd >= 0){

981

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

1480

ret = close(tcp_sd);

982

1481

}

983

1482

if(ret == -1){

984

1483

if(e == 0){

1009

1508

AVAHI_GCC_UNUSED AvahiStringList *txt,

1010

1509

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1011

1510

flags,

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1511

void *mc){

1512

if(r == NULL){

1513

return;

1514

}

1014

1515

1015

1516

/* Called whenever a service has been resolved successfully or

1016

1517

timed out */

1017

1518

1018

1519

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1019

1521

return;

1020

1522

}

1021

1523

1025

1527

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

1026

1528

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

1027

1529

domain,

1028

avahi_strerror(avahi_server_errno(mc.server)));

1530

avahi_strerror(avahi_server_errno

1531

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

1029

1532

break;

1030

1533

1031

1534

case AVAHI_RESOLVER_FOUND:

1037

1540

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

1038

1541

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

1039

1542

}

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1543

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

1544

interface,

1545

avahi_proto_to_af(proto),

1546

mc);

1042

1547

if(ret == 0){

1043

avahi_simple_poll_quit(mc.simple_poll);

1548

avahi_simple_poll_quit(simple_poll);

1044

1549

} else {

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1550

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

1551

avahi_proto_to_af(proto),

1552

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

1047

1553

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

1048

1554

" list\n", name);

1049

1555

}

1062

1568

const char *domain,

1063

1569

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1064

1570

flags,

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1571

void *mc){

1572

if(b == NULL){

1573

return;

1574

}

1067

1575

1068

1576

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

1069

1577

is removed from the LAN */

1077

1585

case AVAHI_BROWSER_FAILURE:

1078

1586

1079

1587

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1588

avahi_strerror(avahi_server_errno

1589

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

1590

avahi_simple_poll_quit(simple_poll);

1082

1591

return;

1083

1592

1084

1593

case AVAHI_BROWSER_NEW:

1087

1596

the callback function is called the Avahi server will free the

1088

1597

resolver for us. */

1089

1598

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1599

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

1600

interface, protocol, name, type,

1601

domain, protocol, 0,

1602

resolve_callback, mc) == NULL)

1093

1603

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

1094

1604

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1605

avahi_strerror(avahi_server_errno

1606

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

1096

1607

break;

1097

1608

1098

1609

case AVAHI_BROWSER_REMOVE:

1117

1628

signal_received = sig;

1118

1629

int old_errno = errno;

1119

1630

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1631

if(simple_poll != NULL){

1632

avahi_simple_poll_quit(simple_poll);

1122

1633

}

1123

1634

errno = old_errno;

1124

1635

}

1125

1636

1637

__attribute__((nonnull, warn_unused_result))

1126

1638

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

1127

1639

int ret;

1128

error_t ret_errno;

1640

int old_errno;

1129

1641

1130

1642

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

1131

1643

if(s < 0){

1132

ret_errno = errno;

1644

old_errno = errno;

1133

1645

perror_plus("socket");

1134

errno = ret_errno;

1646

errno = old_errno;

1135

1647

return false;

1136

1648

}

1137

strcpy(ifr->ifr_name, ifname);

1649

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

1650

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

1138

1651

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1139

1652

if(ret == -1){

1140

1653

if(debug){

1141

ret_errno = errno;

1654

old_errno = errno;

1142

1655

perror_plus("ioctl SIOCGIFFLAGS");

1143

errno = ret_errno;

1656

errno = old_errno;

1144

1657

}

1145

1658

return false;

1146

1659

}

1147

1660

return true;

1148

1661

}

1149

1662

1663

__attribute__((nonnull, warn_unused_result))

1150

1664

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

1151

1665

1152

1666

/* Reject the loopback device */

1194

1708

* corresponds to an acceptable network device.

1195

1709

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

1196

1710

*/

1711

__attribute__((nonnull, warn_unused_result))

1197

1712

int good_interface(const struct dirent *if_entry){

1198

1713

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

1199

1714

return 0;

1217

1732

/*

1218

1733

* This function determines if a network interface is up.

1219

1734

*/

1735

__attribute__((nonnull, warn_unused_result))

1220

1736

bool interface_is_up(const char *interface){

1221

1737

struct ifreq ifr;

1222

1738

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

1233

1749

/*

1234

1750

* This function determines if a network interface is running

1235

1751

*/

1752

__attribute__((nonnull, warn_unused_result))

1236

1753

bool interface_is_running(const char *interface){

1237

1754

struct ifreq ifr;

1238

1755

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

1246

1763

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

1247

1764

}

1248

1765

1766

__attribute__((nonnull, pure, warn_unused_result))

1249

1767

int notdotentries(const struct dirent *direntry){

1250

1768

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

1251

1769

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

1258

1776

}

1259

1777

1260

1778

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

1779

__attribute__((nonnull, warn_unused_result))

1261

1780

int runnable_hook(const struct dirent *direntry){

1262

1781

int ret;

1263

1782

size_t sret;

1271

1790

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

1272

1791

"abcdefghijklmnopqrstuvwxyz"

1273

1792

"0123456789"

1274

"_-");

1793

"_.-");

1275

1794

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

1276

1795

/* Contains non-allowed characters */

1277

1796

if(debug){

1281

1800

return 0;

1282

1801

}

1283

1802

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1803

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

1292

1804

if(ret == -1){

1293

1805

if(debug){

1294

1806

perror_plus("Could not stat hook");

1318

1830

return 1;

1319

1831

}

1320

1832

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1833

__attribute__((nonnull, warn_unused_result))

1834

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1835

mandos_context *mc){

1322

1836

int ret;

1323

1837

struct timespec now;

1324

1838

struct timespec waited_time;

1325

1839

intmax_t block_time;

1326

1840

1327

1841

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1842

if(mc->current_server == NULL){

1843

if(debug){

1330

1844

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

1331

1845

" No timeout!\n");

1332

1846

}

1333

1847

ret = avahi_simple_poll_iterate(s, -1);

1334

1848

} else {

1335

if (debug){

1849

if(debug){

1336

1850

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

1337

1851

" it, or wait\n");

1338

1852

}

1345

1859

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

1346

1860

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

1347

1861

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1862

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

1349

1863

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1864

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

1351

1865

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

1352

1866

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

1353

1867

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

1355

1869

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

1356

1870

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

1357

1871

1358

if (debug){

1872

if(debug){

1359

1873

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

1360

1874

block_time);

1361

1875

}

1362

1876

1363

1877

if(block_time <= 0){

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1878

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

1879

mc->current_server->port,

1880

mc->current_server->if_index,

1881

mc->current_server->af, mc);

1368

1882

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1883

avahi_simple_poll_quit(s);

1370

1884

return 0;

1371

1885

}

1372

1886

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1887

&mc->current_server->last_seen);

1374

1888

if(ret == -1){

1375

1889

perror_plus("clock_gettime");

1376

1890

return -1;

1377

1891

}

1378

mc.current_server = mc.current_server->next;

1892

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

1379

1893

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

1380

1894

servers, but don't block */

1381

1895

}

1383

1897

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

1384

1898

}

1385

1899

if(ret != 0){

1386

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

1900

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

1387

1901

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

1388

1902

}

1389

1903

}

1390

1904

}

1391

1905

}

1392

1906

1393

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

1394

error_t raise_privileges(void){

1395

error_t old_errno = errno;

1396

error_t ret_errno = 0;

1397

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

1398

ret_errno = errno;

1399

perror_plus("seteuid");

1400

}

1401

errno = old_errno;

1402

return ret_errno;

1403

}

1404

1405

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

1406

error_t raise_privileges_permanently(void){

1407

error_t old_errno = errno;

1408

error_t ret_errno = raise_privileges();

1409

if(ret_errno != 0){

1410

errno = old_errno;

1411

return ret_errno;

1412

}

1413

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

1414

ret_errno = errno;

1415

perror_plus("seteuid");

1416

}

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

1421

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

1422

error_t lower_privileges(void){

1423

error_t old_errno = errno;

1424

error_t ret_errno = 0;

1425

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

1426

ret_errno = errno;

1427

perror_plus("seteuid");

1428

}

1429

errno = old_errno;

1430

return ret_errno;

1431

}

1432

1433

/* Lower privileges permanently */

1434

error_t lower_privileges_permanently(void){

1435

error_t old_errno = errno;

1436

error_t ret_errno = 0;

1437

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

1438

ret_errno = errno;

1439

perror_plus("setuid");

1440

}

1441

errno = old_errno;

1442

return ret_errno;

1443

}

1444

1445

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

1907

__attribute__((nonnull))

1908

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

1446

1909

const float delay){

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1910

struct dirent **direntries = NULL;

1911

if(hookdir_fd == -1){

1912

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1913

| O_CLOEXEC);

1914

if(hookdir_fd == -1){

1915

if(errno == ENOENT){

1916

if(debug){

1917

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

1918

" found\n", hookdir);

1919

}

1920

} else {

1921

perror_plus("open");

1922

}

1923

return;

1924

}

1925

}

1926

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

1927

runnable_hook, alphasort);

1452

1928

if(numhooks == -1){

1453

1929

perror_plus("scandir");

1454

} else {

1455

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

1456

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

1457

direntry = direntries[i];

1458

char *fullname = NULL;

1459

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

1460

if(ret < 0){

1930

return;

1931

}

1932

struct dirent *direntry;

1933

int ret;

1934

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

1935

if(devnull == -1){

1936

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

1937

return;

1938

}

1939

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

1940

direntry = direntries[i];

1941

if(debug){

1942

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

1943

direntry->d_name);

1944

}

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

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

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

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

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

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

1990

if(ret == -1){

1461

1991

perror_plus("asprintf");

1462

continue;

1463

}

1464

if(debug){

1465

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

1466

direntry->d_name);

1467

}

1468

pid_t hook_pid = fork();

1469

if(hook_pid == 0){

1470

/* Child */

1471

/* Raise privileges */

1472

raise_privileges_permanently();

1473

/* Set group */

1474

errno = 0;

1475

ret = setgid(0);

1476

if(ret == -1){

1477

perror_plus("setgid");

1478

}

1479

/* Reset supplementary groups */

1480

errno = 0;

1481

ret = setgroups(0, NULL);

1482

if(ret == -1){

1483

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

char *delaystring;

1509

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

1510

if(ret == -1){

1511

perror_plus("asprintf");

1512

_exit(EX_OSERR);

1513

}

1514

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

1515

if(ret == -1){

1516

free(delaystring);

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

1520

1996

free(delaystring);

1521

if(connect_to != NULL){

1522

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

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

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

1529

perror_plus("execl");

1530

_exit(EXIT_FAILURE);

1531

}

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

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

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

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

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

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

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

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

2032

_exit(EX_OSERR);

2033

}

2034

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

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

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

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

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

2054

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

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

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

2061

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

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

1532

2065

} else {

1533

int status;

1534

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

1535

perror_plus("waitpid");

1536

free(fullname);

1537

continue;

1538

}

1539

if(WIFEXITED(status)){

1540

if(WEXITSTATUS(status) != 0){

1541

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

1542

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

1543

WEXITSTATUS(status));

1544

free(fullname);

1545

continue;

1546

}

1547

} else if(WIFSIGNALED(status)){

1548

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

1549

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

1550

WTERMSIG(status));

1551

free(fullname);

1552

continue;

1553

} else {

1554

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

1555

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

1556

free(fullname);

1557

continue;

1558

}

1559

}

1560

free(fullname);

1561

if(debug){

1562

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

1563

direntry->d_name);

1564

}

1565

}

1566

close(devnull);

1567

}

1568

return true;

2066

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

2067

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

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

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

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

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

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

1569

2085

}

1570

2086

1571

error_t bring_up_interface(const char *const interface,

1572

const float delay){

1573

int sd = -1;

1574

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

2087

__attribute__((nonnull, warn_unused_result))

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

2091

int ret;

1577

2092

struct ifreq network;

1578

2093

unsigned int if_index = if_nametoindex(interface);

1579

2094

if(if_index == 0){

1588

2103

}

1589

2104

1590

2105

if(not interface_is_up(interface)){

1591

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

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

2108

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

1592

2109

ret_errno = errno;

1593

2110

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

1594

2111

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

2112

errno = old_errno;

1595

2113

return ret_errno;

1596

2114

}

1597

network.ifr_flags |= IFF_UP;

2115

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

1598

2116

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

2117

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

2118

if(sd == -1){

1601

2119

ret_errno = errno;

1602

2120

perror_plus("socket");

1603

2121

errno = old_errno;

1604

2122

return ret_errno;

1605

2123

}

1606

2124

1607

2125

if(quit_now){

1608

close(sd);

2126

ret = close(sd);

2127

if(ret == -1){

2128

perror_plus("close");

2129

}

1609

2130

errno = old_errno;

1610

2131

return EINTR;

1611

2132

}

1615

2136

interface);

1616

2137

}

1617

2138

1618

/* Raise priviliges */

1619

raise_privileges();

2139

/* Raise privileges */

2140

ret_errno = raise_privileges();

2141

if(ret_errno != 0){

2142

errno = ret_errno;

2143

perror_plus("Failed to raise privileges");

2144

}

1620

2145

1621

2146

#ifdef __linux__

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

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

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

2147

int ret_linux;

2148

bool restore_loglevel = false;

2149

if(ret_errno == 0){

2150

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2151

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

2152

ret_linux = klogctl(8, NULL, 5);

2153

if(ret_linux == -1){

2154

perror_plus("klogctl");

2155

} else {

2156

restore_loglevel = true;

2157

}

1629

2158

}

1630

2159

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

2160

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

2161

ioctl_errno = errno;

1633

2162

#ifdef __linux__

1634

2163

if(restore_loglevel){

1635

2164

ret_linux = klogctl(7, NULL, 0);

1639

2168

}

1640

2169

#endif /* __linux__ */

1641

2170

1642

/* Lower privileges */

1643

lower_privileges();

2171

/* If raise_privileges() succeeded above */

2172

if(ret_errno == 0){

2173

/* Lower privileges */

2174

ret_errno = lower_privileges();

2175

if(ret_errno != 0){

2176

errno = ret_errno;

2177

perror_plus("Failed to lower privileges");

2178

}

2179

}

1644

2180

1645

2181

/* Close the socket */

1646

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

2182

ret = close(sd);

1647

2183

if(ret == -1){

1648

2184

perror_plus("close");

1649

2185

}

1650

2186

1651

2187

if(ret_setflags == -1){

1652

errno = ret_errno;

2188

errno = ioctl_errno;

1653

2189

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

2190

errno = old_errno;

1655

return ret_errno;

2191

return ioctl_errno;

1656

2192

}

1657

2193

} else if(debug){

1658

2194

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

1661

2197

1662

2198

/* Sleep checking until interface is running.

1663

2199

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

1664

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

2200

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

1665

2201

if(interface_is_running(interface)){

1666

2202

break;

1667

2203

}

1676

2212

return 0;

1677

2213

}

1678

2214

1679

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

2215

__attribute__((nonnull, warn_unused_result))

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

1684

2218

struct ifreq network;

1685

2219

unsigned int if_index = if_nametoindex(interface);

1686

2220

if(if_index == 0){

1689

2223

return ENXIO;

1690

2224

}

1691

2225

if(interface_is_up(interface)){

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

1692

2228

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

1693

2229

ret_errno = errno;

1694

2230

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

1695

2231

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

2232

errno = old_errno;

1696

2233

return ret_errno;

1697

2234

}

1698

2235

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

1699

2236

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

2237

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

2238

if(sd == -1){

1702

2239

ret_errno = errno;

1703

2240

perror_plus("socket");

1704

2241

errno = old_errno;

1710

2247

interface);

1711

2248

}

1712

2249

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

2250

/* Raise privileges */

2251

ret_errno = raise_privileges();

2252

if(ret_errno != 0){

2253

errno = ret_errno;

2254

perror_plus("Failed to raise privileges");

2255

}

2256

2257

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

2258

ioctl_errno = errno;

2259

2260

/* If raise_privileges() succeeded above */

2261

if(ret_errno == 0){

2262

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2268

}

1721

2269

1722

2270

/* Close the socket */

1723

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

2271

int ret = close(sd);

1724

2272

if(ret == -1){

1725

2273

perror_plus("close");

1726

2274

}

1727

2275

1728

2276

if(ret_setflags == -1){

1729

errno = ret_errno;

2277

errno = ioctl_errno;

1730

2278

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

2279

errno = old_errno;

1732

return ret_errno;

2280

return ioctl_errno;

1733

2281

}

1734

2282

} else if(debug){

1735

2283

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

1741

2289

}

1742

2290

1743

2291

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

2292

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

2293

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

2294

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

2295

.current_server = NULL, .interfaces = NULL,

2296

.interfaces_size = 0 };

1744

2297

AvahiSServiceBrowser *sb = NULL;

1745

2298

error_t ret_errno;

1746

2299

int ret;

1747

2300

intmax_t tmpmax;

1748

2301

char *tmp;

1749

2302

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

2303

char *interfaces_to_take_down = NULL;

1753

2304

size_t interfaces_to_take_down_size = 0;

1754

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

1755

bool tempdir_created = false;

2305

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

2306

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

2307

char *tempdir = NULL;

1756

2308

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1757

2309

const char *seckey = PATHDIR "/" SECKEY;

1758

2310

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

1759

2312

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1761

2313

1762

2314

bool gnutls_initialized = false;

1763

2315

bool gpgme_initialized = false;

1815

2367

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

1816

2368

" Diffie-Hellman key exchange",

1817

2369

.group = 2 },

2370

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

2371

.arg = "FILE",

2372

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

2373

" for the Diffie-Hellman key exchange",

2374

.group = 2 },

1818

2375

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

1819

2376

.arg = "STRING",

1820

2377

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

1854

2411

connect_to = arg;

1855

2412

break;

1856

2413

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

1857

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1858

(int)',');

2414

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

2415

arg, (int)',');

1859

2416

if(ret_errno != 0){

1860

2417

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

1861

2418

}

1875

2432

}

1876

2433

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

1877

2434

break;

2435

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

2436

dh_params_file = arg;

2437

break;

1878

2438

case 130: /* --priority */

1879

2439

mc.priority = arg;

1880

2440

break;

1920

2480

.args_doc = "",

1921

2481

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

1922

2482

" passwords from a Mandos server" };

1923

ret = argp_parse(&argp, argc, argv,

1924

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1925

switch(ret){

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

1926

2486

case 0:

1927

2487

break;

1928

2488

case ENOMEM:

1929

2489

default:

1930

errno = ret;

2490

errno = ret_errno;

1931

2491

perror_plus("argp_parse");

1932

2492

exitcode = EX_OSERR;

1933

2493

goto end;

1936

2496

goto end;

1937

2497

}

1938

2498

}

1939

2499

1940

2500

{

1941

2501

/* Work around Debian bug #633582:

1942

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

2502

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

1943

2503

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2504

/* Re-raise privileges */

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2508

perror_plus("Failed to raise privileges");

2509

} else {

1946

2510

struct stat st;

1947

2511

1948

2512

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

1962

2526

}

1963

2527

}

1964

2528

}

1965

TEMP_FAILURE_RETRY(close(seckey_fd));

2529

close(seckey_fd);

1966

2530

}

1967

2531

}

1968

2532

1969

2533

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

1970

2534

int pubkey_fd = open(pubkey, O_RDONLY);

1971

2535

if(pubkey_fd == -1){

1983

2547

}

1984

2548

}

1985

2549

}

1986

TEMP_FAILURE_RETRY(close(pubkey_fd));

1987

}

1988

}

1989

2550

close(pubkey_fd);

2551

}

2552

}

2553

2554

if(dh_params_file != NULL

2555

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

2556

int dhparams_fd = open(dh_params_file, O_RDONLY);

2557

if(dhparams_fd == -1){

2558

perror_plus("open");

2559

} else {

2560

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

2561

if(ret == -1){

2562

perror_plus("fstat");

2563

} else {

2564

if(S_ISREG(st.st_mode)

2565

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

2566

ret = fchown(dhparams_fd, uid, gid);

2567

if(ret == -1){

2568

perror_plus("fchown");

2569

}

2570

}

2571

}

2572

close(dhparams_fd);

2573

}

2574

}

2575

1990

2576

/* Lower privileges */

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2580

perror_plus("Failed to lower privileges");

1995

2581

}

1996

2582

}

1997

2583

}

1998

2584

1999

/* Remove empty interface names */

2585

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

2000

2586

{

2001

2587

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2588

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

2003

2589

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2590

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

2591

and if_nametoindex(interface) == 0){

2592

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

2006

2593

fprintf_plus(stderr, "Not using nonexisting interface"

2007

2594

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

2008

2595

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2596

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

2010

2597

interface = NULL;

2011

2598

}

2012

2599

}

2014

2601

2015

2602

/* Run network hooks */

2016

2603

{

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

if(not run_network_hooks("start", interfaces_hooks, delay)){

2026

goto end;

2027

}

2604

if(mc.interfaces != NULL){

2605

interfaces_hooks = malloc(mc.interfaces_size);

2606

if(interfaces_hooks == NULL){

2607

perror_plus("malloc");

2608

goto end;

2609

}

2610

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

2611

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

2612

}

2613

run_network_hooks("start", interfaces_hooks != NULL ?

2614

interfaces_hooks : "", delay);

2028

2615

}

2029

2616

2030

2617

if(not debug){

2035

2622

from the signal handler */

2036

2623

/* Initialize the pseudo-RNG for Avahi */

2037

2624

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

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2625

simple_poll = avahi_simple_poll_new();

2626

if(simple_poll == NULL){

2040

2627

fprintf_plus(stderr,

2041

2628

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

2042

2629

exitcode = EX_UNAVAILABLE;

2107

2694

}

2108

2695

2109

2696

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

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2697

if(mc.interfaces == NULL){

2698

struct dirent **direntries = NULL;

2112

2699

/* Look for any good interfaces */

2113

2700

ret = scandir(sys_class_net, &direntries, good_interface,

2114

2701

alphasort);

2115

2702

if(ret >= 1){

2116

2703

/* Add all found interfaces to interfaces list */

2117

2704

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2705

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

2119

2706

direntries[i]->d_name);

2120

2707

if(ret_errno != 0){

2708

errno = ret_errno;

2121

2709

perror_plus("argz_add");

2710

free(direntries[i]);

2122

2711

continue;

2123

2712

}

2124

2713

if(debug){

2125

2714

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

2126

2715

direntries[i]->d_name);

2127

2716

}

2717

free(direntries[i]);

2128

2718

}

2129

2719

free(direntries);

2130

2720

} else {

2131

free(direntries);

2721

if(ret == 0){

2722

free(direntries);

2723

}

2132

2724

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

2133

2725

exitcode = EXIT_FAILURE;

2134

2726

goto end;

2135

2727

}

2136

2728

}

2137

2729

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

if(not (argz_count(interfaces, interfaces_size) == 1

2149

and strcmp(interfaces, "none") == 0)){

2730

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

2731

{

2150

2732

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2733

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

2152

2734

interface))){

2735

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

2736

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

2737

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

2738

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

2739

interface);

2740

interface = NULL;

2741

while((interface = argz_next(mc.interfaces,

2742

mc.interfaces_size, interface))){

2743

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

2744

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

2745

interface);

2746

interface = NULL;

2747

}

2748

}

2749

break;

2750

}

2153

2751

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2752

errno = bring_up_interface(interface, delay);

2155

2753

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2158

perror_plus("Failed to bring up interface");

2754

if(errno != 0){

2755

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

2756

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

2159

2757

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2758

errno = argz_add(&interfaces_to_take_down,

2759

&interfaces_to_take_down_size,

2760

interface);

2761

if(errno != 0){

2762

perror_plus("argz_add");

2763

}

2163

2764

}

2164

2765

}

2165

2766

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

2767

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

2170

2768

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

2171

2769

}

2172

2770

}

2173

2771

2772

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

2773

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

2774

if(debug){

2775

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

2776

mc.interfaces);

2777

}

2778

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

2779

}

2780

2174

2781

if(quit_now){

2175

2782

goto end;

2176

2783

}

2177

2784

2178

ret = init_gnutls_global(pubkey, seckey);

2785

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

2179

2786

if(ret == -1){

2180

2787

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

2181

2788

exitcode = EX_UNAVAILABLE;

2188

2795

goto end;

2189

2796

}

2190

2797

2191

if(mkdtemp(tempdir) == NULL){

2798

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

2799

tempdir = mkdtemp(run_tempdir);

2800

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

2801

if(debug){

2802

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

2803

run_tempdir, old_tempdir);

2804

}

2805

tempdir = mkdtemp(old_tempdir);

2806

}

2807

if(tempdir == NULL){

2192

2808

perror_plus("mkdtemp");

2193

2809

goto end;

2194

2810

}

2195

tempdir_created = true;

2196

2811

2197

2812

if(quit_now){

2198

2813

goto end;

2199

2814

}

2200

2815

2201

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

2816

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

2202

2817

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

2203

2818

exitcode = EX_UNAVAILABLE;

2204

2819

goto end;

2225

2840

goto end;

2226

2841

}

2227

2842

2228

uint16_t port;

2843

in_port_t port;

2229

2844

errno = 0;

2230

2845

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

2231

2846

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

2232

or tmpmax != (uint16_t)tmpmax){

2847

or tmpmax != (in_port_t)tmpmax){

2233

2848

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

2234

2849

exitcode = EX_USAGE;

2235

2850

goto end;

2236

2851

}

2237

2852

2238

2853

if(quit_now){

2239

2854

goto end;

2240

2855

}

2241

2856

2242

port = (uint16_t)tmpmax;

2857

port = (in_port_t)tmpmax;

2243

2858

*address = '\0';

2244

2859

/* Colon in address indicates IPv6 */

2245

2860

int af;

2261

2876

}

2262

2877

2263

2878

while(not quit_now){

2264

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

2879

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

2880

&mc);

2265

2881

if(quit_now or ret == 0){

2266

2882

break;

2267

2883

}

2269

2885

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

2270

2886

(int)retry_interval);

2271

2887

}

2272

sleep((int)retry_interval);

2888

sleep((unsigned int)retry_interval);

2273

2889

}

2274

2890

2275

if (not quit_now){

2891

if(not quit_now){

2276

2892

exitcode = EXIT_SUCCESS;

2277

2893

}

2278

2894

2293

2909

config.publish_domain = 0;

2294

2910

2295

2911

/* Allocate a new server */

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2912

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2913

&config, NULL, NULL, &ret);

2299

2914

2300

2915

/* Free the Avahi configuration data */

2301

2916

avahi_server_config_free(&config);

2304

2919

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

2305

2920

if(mc.server == NULL){

2306

2921

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

2307

avahi_strerror(ret_errno));

2922

avahi_strerror(ret));

2308

2923

exitcode = EX_UNAVAILABLE;

2309

2924

goto end;

2310

2925

}

2316

2931

/* Create the Avahi service browser */

2317

2932

sb = avahi_s_service_browser_new(mc.server, if_index,

2318

2933

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2319

NULL, 0, browse_callback, NULL);

2934

NULL, 0, browse_callback,

2935

(void *)&mc);

2320

2936

if(sb == NULL){

2321

2937

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

2322

2938

avahi_strerror(avahi_server_errno(mc.server)));

2333

2949

if(debug){

2334

2950

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

2335

2951

}

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2952

2953

ret = avahi_loop_with_timeout(simple_poll,

2954

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

2339

2955

if(debug){

2340

2956

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

2341

2957

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

2344

2960

end:

2345

2961

2346

2962

if(debug){

2347

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

2963

if(signal_received){

2964

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

2965

argv[0], signal_received,

2966

strsignal(signal_received));

2967

} else {

2968

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

2969

}

2348

2970

}

2349

2971

2350

2972

/* Cleanup things */

2973

free(mc.interfaces);

2974

2351

2975

if(sb != NULL)

2352

2976

avahi_s_service_browser_free(sb);

2353

2977

2354

2978

if(mc.server != NULL)

2355

2979

avahi_server_free(mc.server);

2356

2980

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2981

if(simple_poll != NULL)

2982

avahi_simple_poll_free(simple_poll);

2359

2983

2360

2984

if(gnutls_initialized){

2361

2985

gnutls_certificate_free_credentials(mc.cred);

2362

gnutls_global_deinit();

2363

2986

gnutls_dh_params_deinit(mc.dh_params);

2364

2987

}

2365

2988

2373

2996

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

2374

2997

while(mc.current_server != NULL){

2375

2998

server *next = mc.current_server->next;

2999

#ifdef __GNUC__

3000

#pragma GCC diagnostic push

3001

#pragma GCC diagnostic ignored "-Wcast-qual"

3002

#endif

3003

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

3004

#ifdef __GNUC__

3005

#pragma GCC diagnostic pop

3006

#endif

2376

3007

free(mc.current_server);

2377

3008

mc.current_server = next;

2378

3009

}

2379

3010

}

2380

3011

2381

/* Re-raise priviliges */

3012

/* Re-raise privileges */

2382

3013

{

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

2398

}

2399

}

2400

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

2401

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

2402

" down\n");

2403

}

2404

}

2405

2406

lower_privileges_permanently();

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

3017

perror_plus("Failed to raise privileges");

3018

} else {

3019

3020

/* Run network hooks */

3021

run_network_hooks("stop", interfaces_hooks != NULL ?

3022

interfaces_hooks : "", delay);

3023

3024

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

3025

{

3026

char *interface = NULL;

3027

while((interface = argz_next(interfaces_to_take_down,

3028

interfaces_to_take_down_size,

3029

interface))){

3030

ret = take_down_interface(interface);

3031

if(ret != 0){

3032

errno = ret;

3033

perror_plus("Failed to take down interface");

3034

}

3035

}

3036

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

3037

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

3038

" down\n");

3039

}

3040

}

3041

}

3042

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

3046

perror_plus("Failed to lower privileges permanently");

3047

}

2407

3048

}

2408

3049

2409

3050

free(interfaces_to_take_down);

2410

3051

free(interfaces_hooks);

2411

3052

3053

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

3054

uintmax_t level){

3055

struct dirent **direntries = NULL;

3056

int dret;

3057

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

3058

O_RDONLY

3059

| O_NOFOLLOW

3060

| O_DIRECTORY

3061

| O_PATH));

3062

if(dir_fd == -1){

3063

perror_plus("open");

3064

}

3065

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

3066

notdotentries, alphasort);

3067

if(numentries >= 0){

3068

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

3069

if(debug){

3070

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

3071

dirname, direntries[i]->d_name);

3072

}

3073

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

3074

if(dret == -1){

3075

if(errno == EISDIR){

3076

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

3077

AT_REMOVEDIR);

3078

}

3079

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

3080

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

3081

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

3082

/* Recurse only in this special case */

3083

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

3084

dret = 0;

3085

}

3086

if(dret == -1){

3087

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

3088

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

3089

}

3090

}

3091

free(direntries[i]);

3092

}

3093

3094

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

3095

free(direntries);

3096

if(numentries == -1){

3097

perror_plus("scandirat");

3098

}

3099

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3100

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

3101

perror_plus("rmdir");

3102

}

3103

} else {

3104

perror_plus("scandirat");

3105

}

3106

close(dir_fd);

3107

}

3108

2412

3109

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

2413

if(tempdir_created){

2414

struct dirent **direntries = NULL;

2415

struct dirent *direntry = NULL;

2416

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

2417

alphasort);

2418

if (numentries > 0){

2419

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

2420

direntry = direntries[i];

2421

char *fullname = NULL;

2422

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

2423

direntry->d_name);

2424

if(ret < 0){

2425

perror_plus("asprintf");

2426

continue;

2427

}

2428

ret = remove(fullname);

2429

if(ret == -1){

2430

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

2431

strerror(errno));

2432

}

2433

free(fullname);

2434

}

2435

}

2436

2437

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

2438

free(direntries);

2439

if (numentries == -1){

2440

perror_plus("scandir");

2441

}

2442

ret = rmdir(tempdir);

2443

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

2444

perror_plus("rmdir");

2445

}

3110

if(tempdir != NULL){

3111

clean_dir_at(-1, tempdir, 0);

2446

3112

}

2447

3113

2448

3114

if(quit_now){