/mandos/release : revision 237.7.493

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

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*

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* Everything else is

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*

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* This 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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*

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* This file is part of Mandos.

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*

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

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

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

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* (at your option) any later version.

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*

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

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* WITHOUT ANY WARRANTY; without even the implied warranty of

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

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* General Public License for more details.

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26

*

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

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* along with this program. If not, see

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

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

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*

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

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31

*/

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33

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

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34

#ifndef _LARGEFILE_SOURCE

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35

#define _LARGEFILE_SOURCE

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#endif

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#endif /* not _LARGEFILE_SOURCE */

36

37

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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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

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

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stdout, ferror() */

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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#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(),

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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()

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64

*/

62

65

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

63

66

strtoimax() */

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

65

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

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

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ENOTEMPTY,

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72

program_invocation_short_name */

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73

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

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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(),

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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

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87

argp_state, struct argp,

88

95

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

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96

WEXITSTATUS(), WTERMSIG() */

90

97

#include <grp.h> /* setgroups() */

98

#include <argz.h> /* argz_add_sep(), argz_next(),

99

argz_delete(), argz_append(),

100

argz_stringify(), argz_add(),

101

argz_count() */

102

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

103

EAI_SYSTEM, gai_strerror() */

91

104

92

105

#ifdef __linux__

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106

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

135

148

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

136

149

char *connect_to = NULL;

137

150

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

152

uid_t uid = 65534;

153

gid_t gid = 65534;

138

154

139

155

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

140

156

typedef struct server{

141

157

const char *ip;

142

uint16_t port;

158

in_port_t port;

143

159

AvahiIfIndex if_index;

144

160

int af;

145

161

struct timespec last_seen;

149

165

150

166

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

151

167

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

168

AvahiServer *server;

154

169

gnutls_certificate_credentials_t cred;

155

170

unsigned int dh_bits;

157

172

const char *priority;

158

173

gpgme_ctx_t ctx;

159

174

server *current_server;

175

char *interfaces;

176

size_t interfaces_size;

160

177

} mandos_context;

161

178

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

179

/* global so signal handler can reach it*/

180

AvahiSimplePoll *simple_poll;

167

181

168

182

sig_atomic_t quit_now = 0;

169

183

int signal_received = 0;

177

191

perror(print_text);

178

192

}

179

193

180

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

194

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

181

195

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

182

196

va_list ap;

183

197

va_start (ap, format);

184

198

185

199

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

186

200

program_invocation_short_name));

187

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

201

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

188

202

}

189

203

190

204

/*

192

206

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

193

207

* "buffer_length" is how much is already used.

194

208

*/

209

__attribute__((nonnull, warn_unused_result))

195

210

size_t incbuffer(char **buffer, size_t buffer_length,

196

211

size_t buffer_capacity){

197

212

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

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

199

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;

200

219

return 0;

201

220

}

221

*buffer = new_buf;

202

222

buffer_capacity += BUFFER_SIZE;

203

223

}

204

224

return buffer_capacity;

205

225

}

206

226

207

227

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

208

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

209

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){

210

231

int ret;

211

232

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

212

233

if(new_server == NULL){

219

240

.af = af };

220

241

if(new_server->ip == NULL){

221

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);

222

258

return false;

223

259

}

224

260

/* Special case of first server */

225

if (mc.current_server == NULL){

261

if(*current_server == NULL){

226

262

new_server->next = new_server;

227

263

new_server->prev = new_server;

228

mc.current_server = new_server;

229

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

264

*current_server = new_server;

230

265

} else {

231

new_server->next = mc.current_server;

232

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;

233

269

new_server->prev->next = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

270

(*current_server)->prev = new_server;

240

271

}

241

272

return true;

242

273

}

244

275

/*

245

276

* Initialize GPGME.

246

277

*/

247

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

248

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){

249

283

gpgme_error_t rc;

250

284

gpgme_engine_info_t engine_info;

251

285

252

253

286

/*

254

287

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

255

288

*/

256

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

257

290

int ret;

258

291

int fd;

259

292

gpgme_data_t pgp_data;

271

304

return false;

272

305

}

273

306

274

rc = gpgme_op_import(mc.ctx, pgp_data);

307

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

275

308

if(rc != GPG_ERR_NO_ERROR){

276

309

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

277

310

gpgme_strsource(rc), gpgme_strerror(rc));

278

311

return false;

279

312

}

280

313

281

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

314

ret = close(fd);

282

315

if(ret == -1){

283

316

perror_plus("close");

284

317

}

321

354

}

322

355

323

356

/* Create new GPGME "context" */

324

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

357

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

325

358

if(rc != GPG_ERR_NO_ERROR){

326

359

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

327

360

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

340

373

* Decrypt OpenPGP data.

341

374

* Returns -1 on error

342

375

*/

376

__attribute__((nonnull, warn_unused_result))

343

377

static ssize_t pgp_packet_decrypt(const char *cryptotext,

344

378

size_t crypto_size,

345

char **plaintext){

379

char **plaintext,

380

mandos_context *mc){

346

381

gpgme_data_t dh_crypto, dh_plain;

347

382

gpgme_error_t rc;

348

383

ssize_t ret;

374

409

375

410

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

376

411

data buffer */

377

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

412

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

378

413

if(rc != GPG_ERR_NO_ERROR){

379

414

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

380

415

gpgme_strsource(rc), gpgme_strerror(rc));

381

416

plaintext_length = -1;

382

417

if(debug){

383

418

gpgme_decrypt_result_t result;

384

result = gpgme_op_decrypt_result(mc.ctx);

419

result = gpgme_op_decrypt_result(mc->ctx);

385

420

if(result == NULL){

386

421

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

387

422

} else {

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

423

if(result->unsupported_algorithm != NULL) {

424

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

425

result->unsupported_algorithm);

426

}

427

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

428

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

392

429

if(result->file_name != NULL){

393

430

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

394

431

}

464

501

return plaintext_length;

465

502

}

466

503

467

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

470

if(ret == NULL)

471

ret = "(unknown)";

472

return ret;

504

__attribute__((warn_unused_result, const))

505

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

506

if(str == NULL)

507

return "(unknown)";

508

return str;

509

}

510

511

__attribute__((warn_unused_result))

512

static const char *safer_gnutls_strerror(int value){

513

const char *ret = gnutls_strerror(value);

514

return safe_string(ret);

473

515

}

474

516

475

517

/* GnuTLS log function callback */

518

__attribute__((nonnull))

476

519

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

477

520

const char* string){

478

521

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

479

522

}

480

523

524

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

481

525

static int init_gnutls_global(const char *pubkeyfilename,

482

const char *seckeyfilename){

526

const char *seckeyfilename,

527

const char *dhparamsfilename,

528

mandos_context *mc){

483

529

int ret;

530

unsigned int uret;

484

531

485

532

if(debug){

486

533

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

487

534

}

488

535

489

ret = gnutls_global_init();

490

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

493

return -1;

494

}

495

496

536

if(debug){

497

537

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

498

538

* - GnuTLS manual

502

542

}

503

543

504

544

/* OpenPGP credentials */

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

545

ret = gnutls_certificate_allocate_credentials(&mc->cred);

506

546

if(ret != GNUTLS_E_SUCCESS){

507

547

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

508

548

safer_gnutls_strerror(ret));

509

gnutls_global_deinit();

510

549

return -1;

511

550

}

512

551

518

557

}

519

558

520

559

ret = gnutls_certificate_set_openpgp_key_file

521

(mc.cred, pubkeyfilename, seckeyfilename,

560

(mc->cred, pubkeyfilename, seckeyfilename,

522

561

GNUTLS_OPENPGP_FMT_BASE64);

523

562

if(ret != GNUTLS_E_SUCCESS){

524

563

fprintf_plus(stderr,

530

569

}

531

570

532

571

/* GnuTLS server initialization */

533

ret = gnutls_dh_params_init(&mc.dh_params);

572

ret = gnutls_dh_params_init(&mc->dh_params);

534

573

if(ret != GNUTLS_E_SUCCESS){

535

574

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

575

" initialization: %s\n",

537

576

safer_gnutls_strerror(ret));

538

577

goto globalfail;

539

578

}

540

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

541

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

544

goto globalfail;

545

}

546

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

580

if(dhparamsfilename != NULL){

581

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

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

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

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

ret = close(dhpfile);

619

if(ret == -1){

620

perror_plus("close");

621

}

622

if(params.data == NULL){

623

dhparamsfilename = NULL;

624

}

625

if(dhparamsfilename == NULL){

626

break;

627

}

628

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

629

GNUTLS_X509_FMT_PEM);

630

if(ret != GNUTLS_E_SUCCESS){

631

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

632

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

633

safer_gnutls_strerror(ret));

634

dhparamsfilename = NULL;

635

}

636

free(params.data);

637

} while(false);

638

}

639

if(dhparamsfilename == NULL){

640

if(mc->dh_bits == 0){

641

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

642

/* Try to read the private key file */

643

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

644

do {

645

int secfile = open(seckeyfilename, O_RDONLY);

646

if(secfile == -1){

647

perror_plus("open");

648

break;

649

}

650

size_t buffer_capacity = 0;

651

while(true){

652

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

653

(size_t)buffer.size,

654

(size_t)buffer_capacity);

655

if(buffer_capacity == 0){

656

perror_plus("incbuffer");

657

free(buffer.data);

658

buffer.data = NULL;

659

break;

660

}

661

ssize_t bytes_read = read(secfile,

662

buffer.data + buffer.size,

663

BUFFER_SIZE);

664

/* EOF */

665

if(bytes_read == 0){

666

break;

667

}

668

/* check bytes_read for failure */

669

if(bytes_read < 0){

670

perror_plus("read");

671

free(buffer.data);

672

buffer.data = NULL;

673

break;

674

}

675

buffer.size += (unsigned int)bytes_read;

676

}

677

close(secfile);

678

} while(false);

679

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

680

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

681

if(buffer.data != NULL){

682

{

683

gnutls_openpgp_privkey_t privkey = NULL;

684

ret = gnutls_openpgp_privkey_init(&privkey);

685

if(ret != GNUTLS_E_SUCCESS){

686

fprintf_plus(stderr, "Error initializing OpenPGP key"

687

" structure: %s",

688

safer_gnutls_strerror(ret));

689

free(buffer.data);

690

buffer.data = NULL;

691

} else {

692

ret = gnutls_openpgp_privkey_import

693

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

694

if(ret != GNUTLS_E_SUCCESS){

695

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

696

safer_gnutls_strerror(ret));

697

privkey = NULL;

698

}

699

free(buffer.data);

700

buffer.data = NULL;

701

if(privkey != NULL){

702

/* Use private key to suggest an appropriate

703

sec_param */

704

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

705

gnutls_openpgp_privkey_deinit(privkey);

706

if(debug){

707

fprintf_plus(stderr, "This OpenPGP key implies using"

708

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

709

safe_string(gnutls_sec_param_get_name

710

(sec_param)));

711

}

712

}

713

}

714

}

715

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

716

/* Err on the side of caution */

717

sec_param = GNUTLS_SEC_PARAM_ULTRA;

718

if(debug){

719

fprintf_plus(stderr, "Falling back to security parameter"

720

" \"%s\"\n",

721

safe_string(gnutls_sec_param_get_name

722

(sec_param)));

723

}

724

}

725

}

726

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

727

if(uret != 0){

728

mc->dh_bits = uret;

729

if(debug){

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

mc->dh_bits);

735

}

736

} else {

737

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

738

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

739

safe_string(gnutls_sec_param_get_name

740

(sec_param)),

741

safer_gnutls_strerror(ret));

742

goto globalfail;

743

}

744

} else if(debug){

745

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

746

mc->dh_bits);

747

}

748

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

749

if(ret != GNUTLS_E_SUCCESS){

750

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

751

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

752

safer_gnutls_strerror(ret));

753

goto globalfail;

754

}

755

}

756

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

548

757

549

758

return 0;

550

759

551

760

globalfail:

552

761

553

gnutls_certificate_free_credentials(mc.cred);

554

gnutls_global_deinit();

555

gnutls_dh_params_deinit(mc.dh_params);

762

gnutls_certificate_free_credentials(mc->cred);

763

gnutls_dh_params_deinit(mc->dh_params);

556

764

return -1;

557

765

}

558

766

559

static int init_gnutls_session(gnutls_session_t *session){

767

__attribute__((nonnull, warn_unused_result))

768

static int init_gnutls_session(gnutls_session_t *session,

769

mandos_context *mc){

560

770

int ret;

561

771

/* GnuTLS session creation */

562

772

do {

574

784

{

575

785

const char *err;

576

786

do {

577

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

787

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

578

788

if(quit_now){

579

789

gnutls_deinit(*session);

580

790

return -1;

591

801

592

802

do {

593

803

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

594

mc.cred);

804

mc->cred);

595

805

if(quit_now){

596

806

gnutls_deinit(*session);

597

807

return -1;

607

817

/* ignore client certificate if any. */

608

818

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

609

819

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

611

612

820

return 0;

613

821

}

614

822

616

824

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

617

825

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

618

826

827

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

828

__attribute__((warn_unused_result))

829

int raise_privileges(void){

830

int old_errno = errno;

831

int ret = 0;

832

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

833

ret = errno;

834

}

835

errno = old_errno;

836

return ret;

837

}

838

839

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

840

__attribute__((warn_unused_result))

841

int raise_privileges_permanently(void){

842

int old_errno = errno;

843

int ret = raise_privileges();

844

if(ret != 0){

845

errno = old_errno;

846

return ret;

847

}

848

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

849

ret = errno;

850

}

851

errno = old_errno;

852

return ret;

853

}

854

855

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

856

__attribute__((warn_unused_result))

857

int lower_privileges(void){

858

int old_errno = errno;

859

int ret = 0;

860

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

861

ret = errno;

862

}

863

errno = old_errno;

864

return ret;

865

}

866

867

/* Lower privileges permanently */

868

__attribute__((warn_unused_result))

869

int lower_privileges_permanently(void){

870

int old_errno = errno;

871

int ret = 0;

872

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

873

ret = errno;

874

}

875

errno = old_errno;

876

return ret;

877

}

878

879

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

880

__attribute__((nonnull, warn_unused_result))

881

static bool add_delete_local_route(const bool add,

882

const char *address,

883

AvahiIfIndex if_index){

884

int ret;

885

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

886

char add_arg[] = "add";

887

char delete_arg[] = "delete";

888

char debug_flag[] = "--debug";

889

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

890

if(pluginhelperdir == NULL){

891

if(debug){

892

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

893

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

894

}

895

return false;

896

}

897

898

char interface[IF_NAMESIZE];

899

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

900

perror_plus("if_indextoname");

901

return false;

902

}

903

904

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

905

if(devnull == -1){

906

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

907

return false;

908

}

909

pid_t pid = fork();

910

if(pid == 0){

911

/* Child */

912

/* Raise privileges */

913

errno = raise_privileges_permanently();

914

if(errno != 0){

915

perror_plus("Failed to raise privileges");

916

/* _exit(EX_NOPERM); */

917

} else {

918

/* Set group */

919

errno = 0;

920

ret = setgid(0);

921

if(ret == -1){

922

perror_plus("setgid");

923

_exit(EX_NOPERM);

924

}

925

/* Reset supplementary groups */

926

errno = 0;

927

ret = setgroups(0, NULL);

928

if(ret == -1){

929

perror_plus("setgroups");

930

_exit(EX_NOPERM);

931

}

932

}

933

ret = dup2(devnull, STDIN_FILENO);

934

if(ret == -1){

935

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

936

_exit(EX_OSERR);

937

}

938

ret = close(devnull);

939

if(ret == -1){

940

perror_plus("close");

941

_exit(EX_OSERR);

942

}

943

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

944

if(ret == -1){

945

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

946

_exit(EX_OSERR);

947

}

948

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

949

O_RDONLY

950

| O_DIRECTORY

951

| O_PATH

952

| O_CLOEXEC));

953

if(helperdir_fd == -1){

954

perror_plus("open");

955

_exit(EX_UNAVAILABLE);

956

}

957

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

958

helper, O_RDONLY));

959

if(helper_fd == -1){

960

perror_plus("openat");

961

close(helperdir_fd);

962

_exit(EX_UNAVAILABLE);

963

}

964

close(helperdir_fd);

965

#ifdef __GNUC__

966

#pragma GCC diagnostic push

967

#pragma GCC diagnostic ignored "-Wcast-qual"

968

#endif

969

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

970

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

971

interface, debug ? debug_flag : NULL, NULL },

972

environ) == -1){

973

#ifdef __GNUC__

974

#pragma GCC diagnostic pop

975

#endif

976

perror_plus("fexecve");

977

_exit(EXIT_FAILURE);

978

}

979

}

980

if(pid == -1){

981

perror_plus("fork");

982

return false;

983

}

984

int status;

985

pid_t pret = -1;

986

errno = 0;

987

do {

988

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

989

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

990

int errno_raising = 0;

991

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

992

errno_raising = errno;

993

perror_plus("Failed to raise privileges in order to"

994

" kill helper program");

995

}

996

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

997

perror_plus("kill");

998

}

999

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

1000

perror_plus("Failed to lower privileges after killing"

1001

" helper program");

1002

}

1003

return false;

1004

}

1005

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

1006

if(pret == -1){

1007

perror_plus("waitpid");

1008

return false;

1009

}

1010

if(WIFEXITED(status)){

1011

if(WEXITSTATUS(status) != 0){

1012

fprintf_plus(stderr, "Error: iprouteadddel exited"

1013

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

1014

return false;

1015

}

1016

return true;

1017

}

1018

if(WIFSIGNALED(status)){

1019

fprintf_plus(stderr, "Error: iprouteadddel died by"

1020

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

1021

return false;

1022

}

1023

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

1024

return false;

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool add_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(true, address, if_index);

1034

}

1035

1036

__attribute__((nonnull, warn_unused_result))

1037

static bool delete_local_route(const char *address,

1038

AvahiIfIndex if_index){

1039

if(debug){

1040

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

1041

}

1042

return add_delete_local_route(false, address, if_index);

1043

}

1044

619

1045

/* Called when a Mandos server is found */

620

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

1046

__attribute__((nonnull, warn_unused_result))

1047

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

621

1048

AvahiIfIndex if_index,

622

int af){

1049

int af, mandos_context *mc){

623

1050

int ret, tcp_sd = -1;

624

1051

ssize_t sret;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

1052

struct sockaddr_storage to;

629

1053

char *buffer = NULL;

630

1054

char *decrypted_buffer = NULL;

631

1055

size_t buffer_length = 0;

634

1058

int retval = -1;

635

1059

gnutls_session_t session;

636

1060

int pf; /* Protocol family */

1061

bool route_added = false;

637

1062

638

1063

errno = 0;

639

1064

655

1080

return -1;

656

1081

}

657

1082

658

ret = init_gnutls_session(&session);

1083

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

1084

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

1085

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

1086

bool match = false;

1087

{

1088

char *interface = NULL;

1089

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

1090

mc->interfaces_size,

1091

interface))){

1092

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

1093

match = true;

1094

break;

1095

}

1096

}

1097

}

1098

if(not match){

1099

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

1100

connect to the server */

1101

if(debug){

1102

char interface[IF_NAMESIZE];

1103

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

1104

perror_plus("if_indextoname");

1105

} else {

1106

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

1107

" \"%s\"\n",

1108

if_indextoname((unsigned int)if_index,

1109

interface));

1110

}

1111

}

1112

return -1;

1113

}

1114

}

1115

1116

ret = init_gnutls_session(&session, mc);

659

1117

if(ret != 0){

660

1118

return -1;

661

1119

}

662

1120

663

1121

if(debug){

664

1122

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

665

PRIu16 "\n", ip, port);

1123

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

666

1124

}

667

1125

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

1126

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

669

1127

if(tcp_sd < 0){

670

1128

int e = errno;

671

1129

perror_plus("socket");

678

1136

goto mandos_end;

679

1137

}

680

1138

681

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

682

1139

if(af == AF_INET6){

683

to.in6.sin6_family = (sa_family_t)af;

684

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

1140

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

1141

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

1142

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

685

1143

} else { /* IPv4 */

686

to.in.sin_family = (sa_family_t)af;

687

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

1144

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

1145

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

1146

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

688

1147

}

689

1148

if(ret < 0 ){

690

1149

int e = errno;

699

1158

goto mandos_end;

700

1159

}

701

1160

if(af == AF_INET6){

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

1161

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

1162

if(IN6_IS_ADDR_LINKLOCAL

1163

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

709

1164

if(if_index == AVAHI_IF_UNSPEC){

710

1165

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

711

1166

" incomplete without a network interface\n");

713

1168

goto mandos_end;

714

1169

}

715

1170

/* Set the network interface number as scope */

716

to.in6.sin6_scope_id = (uint32_t)if_index;

1171

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

717

1172

}

718

1173

} else {

719

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

720

-Wconversion and

721

-Wunreachable-code */

1174

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

722

1175

}

723

1176

724

1177

if(quit_now){

732

1185

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

733

1186

perror_plus("if_indextoname");

734

1187

} else {

735

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

736

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

1188

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

1189

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

737

1190

}

738

1191

} else {

739

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

740

ip, port);

1192

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

1193

ip, (uintmax_t)port);

741

1194

}

742

1195

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

1196

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

744

const char *pcret;

745

if(af == AF_INET6){

746

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

747

sizeof(addrstr));

748

} else {

749

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

750

sizeof(addrstr));

751

}

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

758

}

759

}

760

761

if(quit_now){

762

errno = EINTR;

763

goto mandos_end;

764

}

765

766

if(af == AF_INET6){

767

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

768

} else {

769

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

770

}

771

if(ret < 0){

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

777

goto mandos_end;

778

}

779

780

if(quit_now){

781

errno = EINTR;

782

goto mandos_end;

1197

if(af == AF_INET6){

1198

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

1199

sizeof(struct sockaddr_in6),

1200

addrstr, sizeof(addrstr), NULL, 0,

1201

NI_NUMERICHOST);

1202

} else {

1203

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

1204

sizeof(struct sockaddr_in),

1205

addrstr, sizeof(addrstr), NULL, 0,

1206

NI_NUMERICHOST);

1207

}

1208

if(ret == EAI_SYSTEM){

1209

perror_plus("getnameinfo");

1210

} else if(ret != 0) {

1211

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

1212

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

1213

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

1214

}

1215

}

1216

1217

if(quit_now){

1218

errno = EINTR;

1219

goto mandos_end;

1220

}

1221

1222

while(true){

1223

if(af == AF_INET6){

1224

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

1225

sizeof(struct sockaddr_in6));

1226

} else {

1227

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

1228

sizeof(struct sockaddr_in));

1229

}

1230

if(ret < 0){

1231

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

1232

and if_index != AVAHI_IF_UNSPEC

1233

and connect_to == NULL

1234

and not route_added and

1235

((af == AF_INET6 and not

1236

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1237

&to)->sin6_addr)))

1238

or (af == AF_INET and

1239

/* Not a a IPv4LL address */

1240

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

1241

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

1242

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

1243

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

1244

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

1245

connect to a Mandos server announced by Avahi on a server

1246

host with a global address. Work around this by retrying

1247

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

1248

1249

Avahi bug reference:

1250

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

1251

https://bugs.debian.org/587961

1252

*/

1253

if(debug){

1254

fprintf_plus(stderr, "Mandos server unreachable, trying"

1255

" direct route\n");

1256

}

1257

int e = errno;

1258

route_added = add_local_route(ip, if_index);

1259

if(route_added){

1260

continue;

1261

}

1262

errno = e;

1263

}

1264

if(errno != ECONNREFUSED or debug){

1265

int e = errno;

1266

perror_plus("connect");

1267

errno = e;

1268

}

1269

goto mandos_end;

1270

}

1271

1272

if(quit_now){

1273

errno = EINTR;

1274

goto mandos_end;

1275

}

1276

break;

783

1277

}

784

1278

785

1279

const char *out = mandos_protocol_version;

821

1315

goto mandos_end;

822

1316

}

823

1317

824

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1318

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

1319

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

1320

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

1321

gnutls_transport_set_ptr(session,

1322

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

826

1323

827

1324

if(quit_now){

828

1325

errno = EINTR;

933

1430

if(buffer_length > 0){

934

1431

ssize_t decrypted_buffer_size;

935

1432

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

936

&decrypted_buffer);

1433

&decrypted_buffer, mc);

937

1434

if(decrypted_buffer_size >= 0){

938

1435

1436

clearerr(stdout);

939

1437

written = 0;

940

1438

while(written < (size_t) decrypted_buffer_size){

941

1439

if(quit_now){

957

1455

}

958

1456

written += (size_t)ret;

959

1457

}

1458

ret = fflush(stdout);

1459

if(ret != 0){

1460

int e = errno;

1461

if(debug){

1462

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

1463

strerror(errno));

1464

}

1465

errno = e;

1466

goto mandos_end;

1467

}

960

1468

retval = 0;

961

1469

}

962

1470

}

965

1473

966

1474

mandos_end:

967

1475

{

1476

if(route_added){

1477

if(not delete_local_route(ip, if_index)){

1478

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

1479

" interface %d", ip, if_index);

1480

}

1481

}

968

1482

int e = errno;

969

1483

free(decrypted_buffer);

970

1484

free(buffer);

971

1485

if(tcp_sd >= 0){

972

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

1486

ret = close(tcp_sd);

973

1487

}

974

1488

if(ret == -1){

975

1489

if(e == 0){

1000

1514

AVAHI_GCC_UNUSED AvahiStringList *txt,

1001

1515

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1002

1516

flags,

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1517

void *mc){

1518

if(r == NULL){

1519

return;

1520

}

1005

1521

1006

1522

/* Called whenever a service has been resolved successfully or

1007

1523

timed out */

1008

1524

1009

1525

if(quit_now){

1526

avahi_s_service_resolver_free(r);

1010

1527

return;

1011

1528

}

1012

1529

1016

1533

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

1017

1534

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

1018

1535

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1536

avahi_strerror(avahi_server_errno

1537

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

1020

1538

break;

1021

1539

1022

1540

case AVAHI_RESOLVER_FOUND:

1028

1546

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

1029

1547

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

1030

1548

}

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1549

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

1550

interface,

1551

avahi_proto_to_af(proto),

1552

mc);

1033

1553

if(ret == 0){

1034

avahi_simple_poll_quit(mc.simple_poll);

1554

avahi_simple_poll_quit(simple_poll);

1035

1555

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1556

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

1557

avahi_proto_to_af(proto),

1558

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

1038

1559

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

1039

1560

" list\n", name);

1040

1561

}

1053

1574

const char *domain,

1054

1575

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1055

1576

flags,

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1577

void *mc){

1578

if(b == NULL){

1579

return;

1580

}

1058

1581

1059

1582

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

1060

1583

is removed from the LAN */

1068

1591

case AVAHI_BROWSER_FAILURE:

1069

1592

1070

1593

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1594

avahi_strerror(avahi_server_errno

1595

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

1596

avahi_simple_poll_quit(simple_poll);

1073

1597

return;

1074

1598

1075

1599

case AVAHI_BROWSER_NEW:

1078

1602

the callback function is called the Avahi server will free the

1079

1603

resolver for us. */

1080

1604

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1605

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

1606

interface, protocol, name, type,

1607

domain, protocol, 0,

1608

resolve_callback, mc) == NULL)

1084

1609

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

1085

1610

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1611

avahi_strerror(avahi_server_errno

1612

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

1087

1613

break;

1088

1614

1089

1615

case AVAHI_BROWSER_REMOVE:

1108

1634

signal_received = sig;

1109

1635

int old_errno = errno;

1110

1636

/* set main loop to exit */

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1637

if(simple_poll != NULL){

1638

avahi_simple_poll_quit(simple_poll);

1113

1639

}

1114

1640

errno = old_errno;

1115

1641

}

1116

1642

1643

__attribute__((nonnull, warn_unused_result))

1117

1644

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

1118

1645

int ret;

1646

int old_errno;

1119

1647

1120

1648

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

1121

1649

if(s < 0){

1650

old_errno = errno;

1122

1651

perror_plus("socket");

1652

errno = old_errno;

1123

1653

return false;

1124

1654

}

1125

strcpy(ifr->ifr_name, ifname);

1655

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

1656

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

1126

1657

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1127

1658

if(ret == -1){

1128

1659

if(debug){

1660

old_errno = errno;

1129

1661

perror_plus("ioctl SIOCGIFFLAGS");

1662

errno = old_errno;

1663

}

1664

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

1665

old_errno = errno;

1666

perror_plus("close");

1667

errno = old_errno;

1130

1668

}

1131

1669

return false;

1132

1670

}

1671

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

1672

old_errno = errno;

1673

perror_plus("close");

1674

errno = old_errno;

1675

}

1133

1676

return true;

1134

1677

}

1135

1678

1679

__attribute__((nonnull, warn_unused_result))

1136

1680

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

1137

1681

1138

1682

/* Reject the loopback device */

1180

1724

* corresponds to an acceptable network device.

1181

1725

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

1182

1726

*/

1727

__attribute__((nonnull, warn_unused_result))

1183

1728

int good_interface(const struct dirent *if_entry){

1184

1729

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

1185

1730

return 0;

1201

1746

}

1202

1747

1203

1748

/*

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1749

* This function determines if a network interface is up.

1750

*/

1751

__attribute__((nonnull, warn_unused_result))

1752

bool interface_is_up(const char *interface){

1753

struct ifreq ifr;

1754

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

1755

if(debug){

1756

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

1757

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

1758

}

1759

return false;

1760

}

1761

1762

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

1763

}

1764

1765

/*

1766

* This function determines if a network interface is running

1767

*/

1768

__attribute__((nonnull, warn_unused_result))

1769

bool interface_is_running(const char *interface){

1770

struct ifreq ifr;

1771

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

1772

if(debug){

1773

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

1774

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

1775

}

1776

return false;

1777

}

1778

1779

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

1780

}

1781

1782

__attribute__((nonnull, pure, warn_unused_result))

1246

1783

int notdotentries(const struct dirent *direntry){

1247

1784

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

1248

1785

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

1255

1792

}

1256

1793

1257

1794

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

1795

__attribute__((nonnull, warn_unused_result))

1258

1796

int runnable_hook(const struct dirent *direntry){

1259

1797

int ret;

1260

1798

size_t sret;

1268

1806

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

1269

1807

"abcdefghijklmnopqrstuvwxyz"

1270

1808

"0123456789"

1271

"_-");

1809

"_.-");

1272

1810

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

1273

1811

/* Contains non-allowed characters */

1274

1812

if(debug){

1278

1816

return 0;

1279

1817

}

1280

1818

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1819

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

1289

1820

if(ret == -1){

1290

1821

if(debug){

1291

1822

perror_plus("Could not stat hook");

1315

1846

return 1;

1316

1847

}

1317

1848

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1849

__attribute__((nonnull, warn_unused_result))

1850

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1851

mandos_context *mc){

1319

1852

int ret;

1320

1853

struct timespec now;

1321

1854

struct timespec waited_time;

1322

1855

intmax_t block_time;

1323

1856

1324

1857

while(true){

1325

if(mc.current_server == NULL){

1326

if (debug){

1858

if(mc->current_server == NULL){

1859

if(debug){

1327

1860

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

1328

1861

" No timeout!\n");

1329

1862

}

1330

1863

ret = avahi_simple_poll_iterate(s, -1);

1331

1864

} else {

1332

if (debug){

1865

if(debug){

1333

1866

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

1334

1867

" it, or wait\n");

1335

1868

}

1342

1875

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

1343

1876

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

1344

1877

waited_time.tv_sec = (now.tv_sec

1345

- mc.current_server->last_seen.tv_sec);

1878

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

1346

1879

waited_time.tv_nsec = (now.tv_nsec

1347

- mc.current_server->last_seen.tv_nsec);

1880

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

1348

1881

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

1349

1882

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

1350

1883

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

1352

1885

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

1353

1886

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

1354

1887

1355

if (debug){

1888

if(debug){

1356

1889

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

1357

1890

block_time);

1358

1891

}

1359

1892

1360

1893

if(block_time <= 0){

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1894

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

1895

mc->current_server->port,

1896

mc->current_server->if_index,

1897

mc->current_server->af, mc);

1365

1898

if(ret == 0){

1366

avahi_simple_poll_quit(mc.simple_poll);

1899

avahi_simple_poll_quit(s);

1367

1900

return 0;

1368

1901

}

1369

1902

ret = clock_gettime(CLOCK_MONOTONIC,

1370

&mc.current_server->last_seen);

1903

&mc->current_server->last_seen);

1371

1904

if(ret == -1){

1372

1905

perror_plus("clock_gettime");

1373

1906

return -1;

1374

1907

}

1375

mc.current_server = mc.current_server->next;

1908

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

1376

1909

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

1377

1910

servers, but don't block */

1378

1911

}

1380

1913

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

1381

1914

}

1382

1915

if(ret != 0){

1383

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

1916

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

1384

1917

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

1385

1918

}

1386

1919

}

1387

1920

}

1388

1921

}

1389

1922

1390

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

1923

__attribute__((nonnull))

1924

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

1391

1925

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1926

struct dirent **direntries = NULL;

1927

if(hookdir_fd == -1){

1928

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1929

| O_CLOEXEC);

1930

if(hookdir_fd == -1){

1931

if(errno == ENOENT){

1932

if(debug){

1933

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

1934

" found\n", hookdir);

1935

}

1936

} else {

1937

perror_plus("open");

1938

}

1939

return;

1940

}

1941

}

1942

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

1943

if(devnull == -1){

1944

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

1945

return;

1946

}

1947

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

1948

runnable_hook, alphasort);

1397

1949

if(numhooks == -1){

1398

1950

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1951

close(devnull);

1952

return;

1953

}

1954

struct dirent *direntry;

1955

int ret;

1956

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

1957

direntry = direntries[i];

1958

if(debug){

1959

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

1960

direntry->d_name);

1961

}

1962

pid_t hook_pid = fork();

1963

if(hook_pid == 0){

1964

/* Child */

1965

/* Raise privileges */

1966

errno = raise_privileges_permanently();

1967

if(errno != 0){

1968

perror_plus("Failed to raise privileges");

1969

_exit(EX_NOPERM);

1970

}

1971

/* Set group */

1972

errno = 0;

1973

ret = setgid(0);

1974

if(ret == -1){

1975

perror_plus("setgid");

1976

_exit(EX_NOPERM);

1977

}

1978

/* Reset supplementary groups */

1979

errno = 0;

1980

ret = setgroups(0, NULL);

1981

if(ret == -1){

1982

perror_plus("setgroups");

1983

_exit(EX_NOPERM);

1984

}

1985

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

1986

if(ret == -1){

1987

perror_plus("setenv");

1988

_exit(EX_OSERR);

1989

}

1990

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

1991

if(ret == -1){

1992

perror_plus("setenv");

1993

_exit(EX_OSERR);

1994

}

1995

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

1996

if(ret == -1){

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

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

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

char *delaystring;

2006

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

2007

if(ret == -1){

1406

2008

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

2009

_exit(EX_OSERR);

2010

}

2011

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

2012

if(ret == -1){

1475

2013

free(delaystring);

1476

if(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

2014

perror_plus("setenv");

2015

_exit(EX_OSERR);

2016

}

2017

free(delaystring);

2018

if(connect_to != NULL){

2019

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

2020

if(ret == -1){

2021

perror_plus("setenv");

2022

_exit(EX_OSERR);

2023

}

2024

}

2025

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

2026

direntry->d_name,

2027

O_RDONLY));

2028

if(hook_fd == -1){

2029

perror_plus("openat");

2030

_exit(EXIT_FAILURE);

2031

}

2032

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

2033

perror_plus("close");

2034

_exit(EXIT_FAILURE);

2035

}

2036

ret = dup2(devnull, STDIN_FILENO);

2037

if(ret == -1){

2038

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

2039

_exit(EX_OSERR);

2040

}

2041

ret = close(devnull);

2042

if(ret == -1){

2043

perror_plus("close");

2044

_exit(EX_OSERR);

2045

}

2046

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2047

if(ret == -1){

2048

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

2049

_exit(EX_OSERR);

2050

}

2051

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

2052

environ) == -1){

2053

perror_plus("fexecve");

2054

_exit(EXIT_FAILURE);

2055

}

2056

} else {

2057

if(hook_pid == -1){

2058

perror_plus("fork");

2059

free(direntry);

2060

continue;

2061

}

2062

int status;

2063

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

2064

perror_plus("waitpid");

2065

free(direntry);

2066

continue;

2067

}

2068

if(WIFEXITED(status)){

2069

if(WEXITSTATUS(status) != 0){

2070

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

2071

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

2072

WEXITSTATUS(status));

2073

free(direntry);

2074

continue;

2075

}

2076

} else if(WIFSIGNALED(status)){

2077

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

2078

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

2079

WTERMSIG(status));

2080

free(direntry);

2081

continue;

2082

} else {

2083

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

2084

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

2085

free(direntry);

2086

continue;

2087

}

2088

}

2089

if(debug){

2090

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

2091

direntry->d_name);

2092

}

2093

free(direntry);

2094

}

2095

free(direntries);

2096

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

2097

perror_plus("close");

2098

} else {

2099

hookdir_fd = -1;

2100

}

2101

close(devnull);

2102

}

2103

2104

__attribute__((nonnull, warn_unused_result))

2105

int bring_up_interface(const char *const interface,

2106

const float delay){

2107

int old_errno = errno;

2108

int ret;

2109

struct ifreq network;

2110

unsigned int if_index = if_nametoindex(interface);

2111

if(if_index == 0){

2112

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

2113

errno = old_errno;

2114

return ENXIO;

2115

}

2116

2117

if(quit_now){

2118

errno = old_errno;

2119

return EINTR;

2120

}

2121

2122

if(not interface_is_up(interface)){

2123

int ret_errno = 0;

2124

int ioctl_errno = 0;

2125

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

2126

ret_errno = errno;

2127

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

2128

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

2129

errno = old_errno;

2130

return ret_errno;

2131

}

2132

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

2133

2134

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

2135

if(sd == -1){

2136

ret_errno = errno;

2137

perror_plus("socket");

2138

errno = old_errno;

2139

return ret_errno;

2140

}

2141

2142

if(quit_now){

2143

ret = close(sd);

2144

if(ret == -1){

2145

perror_plus("close");

2146

}

2147

errno = old_errno;

2148

return EINTR;

2149

}

2150

2151

if(debug){

2152

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

2153

interface);

2154

}

2155

2156

/* Raise privileges */

2157

ret_errno = raise_privileges();

2158

if(ret_errno != 0){

2159

errno = ret_errno;

2160

perror_plus("Failed to raise privileges");

2161

}

2162

2163

#ifdef __linux__

2164

int ret_linux;

2165

bool restore_loglevel = false;

2166

if(ret_errno == 0){

2167

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2168

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

2169

ret_linux = klogctl(8, NULL, 5);

2170

if(ret_linux == -1){

2171

perror_plus("klogctl");

2172

} else {

2173

restore_loglevel = true;

2174

}

2175

}

2176

#endif /* __linux__ */

2177

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

2178

ioctl_errno = errno;

2179

#ifdef __linux__

2180

if(restore_loglevel){

2181

ret_linux = klogctl(7, NULL, 0);

2182

if(ret_linux == -1){

2183

perror_plus("klogctl");

2184

}

2185

}

2186

#endif /* __linux__ */

2187

2188

/* If raise_privileges() succeeded above */

2189

if(ret_errno == 0){

2190

/* Lower privileges */

2191

ret_errno = lower_privileges();

2192

if(ret_errno != 0){

2193

errno = ret_errno;

2194

perror_plus("Failed to lower privileges");

2195

}

2196

}

2197

2198

/* Close the socket */

2199

ret = close(sd);

2200

if(ret == -1){

2201

perror_plus("close");

2202

}

2203

2204

if(ret_setflags == -1){

2205

errno = ioctl_errno;

2206

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2207

errno = old_errno;

2208

return ioctl_errno;

2209

}

2210

} else if(debug){

2211

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

2212

interface);

2213

}

2214

2215

/* Sleep checking until interface is running.

2216

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

2217

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

2218

if(interface_is_running(interface)){

2219

break;

2220

}

2221

struct timespec sleeptime = { .tv_nsec = 250000000 };

2222

ret = nanosleep(&sleeptime, NULL);

2223

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

2224

perror_plus("nanosleep");

2225

}

2226

}

2227

2228

errno = old_errno;

2229

return 0;

2230

}

2231

2232

__attribute__((nonnull, warn_unused_result))

2233

int take_down_interface(const char *const interface){

2234

int old_errno = errno;

2235

struct ifreq network;

2236

unsigned int if_index = if_nametoindex(interface);

2237

if(if_index == 0){

2238

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

2239

errno = old_errno;

2240

return ENXIO;

2241

}

2242

if(interface_is_up(interface)){

2243

int ret_errno = 0;

2244

int ioctl_errno = 0;

2245

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

2246

ret_errno = errno;

2247

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

2248

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

2249

errno = old_errno;

2250

return ret_errno;

2251

}

2252

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

2253

2254

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

2255

if(sd == -1){

2256

ret_errno = errno;

2257

perror_plus("socket");

2258

errno = old_errno;

2259

return ret_errno;

2260

}

2261

2262

if(debug){

2263

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

2264

interface);

2265

}

2266

2267

/* Raise privileges */

2268

ret_errno = raise_privileges();

2269

if(ret_errno != 0){

2270

errno = ret_errno;

2271

perror_plus("Failed to raise privileges");

2272

}

2273

2274

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

2275

ioctl_errno = errno;

2276

2277

/* If raise_privileges() succeeded above */

2278

if(ret_errno == 0){

2279

/* Lower privileges */

2280

ret_errno = lower_privileges();

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2283

perror_plus("Failed to lower privileges");

2284

}

2285

}

2286

2287

/* Close the socket */

2288

int ret = close(sd);

2289

if(ret == -1){

2290

perror_plus("close");

2291

}

2292

2293

if(ret_setflags == -1){

2294

errno = ioctl_errno;

2295

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2296

errno = old_errno;

2297

return ioctl_errno;

2298

}

2299

} else if(debug){

2300

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

2301

interface);

2302

}

2303

2304

errno = old_errno;

2305

return 0;

1524

2306

}

1525

2307

1526

2308

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

2309

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

2310

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

2311

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

2312

.current_server = NULL, .interfaces = NULL,

2313

.interfaces_size = 0 };

1527

2314

AvahiSServiceBrowser *sb = NULL;

1528

int error;

2315

error_t ret_errno;

1529

2316

int ret;

1530

2317

intmax_t tmpmax;

1531

2318

char *tmp;

1532

2319

int exitcode = EXIT_SUCCESS;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1539

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

1540

bool tempdir_created = false;

2320

char *interfaces_to_take_down = NULL;

2321

size_t interfaces_to_take_down_size = 0;

2322

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

2323

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

2324

char *tempdir = NULL;

1541

2325

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1542

2326

const char *seckey = PATHDIR "/" SECKEY;

1543

2327

const char *pubkey = PATHDIR "/" PUBKEY;

2328

const char *dh_params_file = NULL;

2329

char *interfaces_hooks = NULL;

1544

2330

1545

2331

bool gnutls_initialized = false;

1546

2332

bool gpgme_initialized = false;

1598

2384

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

1599

2385

" Diffie-Hellman key exchange",

1600

2386

.group = 2 },

2387

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

2388

.arg = "FILE",

2389

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

2390

" for the Diffie-Hellman key exchange",

2391

.group = 2 },

1601

2392

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

1602

2393

.arg = "STRING",

1603

2394

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

1637

2428

connect_to = arg;

1638

2429

break;

1639

2430

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

1640

interface = arg;

2431

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

2432

arg, (int)',');

2433

if(ret_errno != 0){

2434

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

2435

}

1641

2436

break;

1642

2437

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

1643

2438

seckey = arg;

1654

2449

}

1655

2450

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

1656

2451

break;

2452

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

2453

dh_params_file = arg;

2454

break;

1657

2455

case 130: /* --priority */

1658

2456

mc.priority = arg;

1659

2457

break;

1699

2497

.args_doc = "",

1700

2498

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

1701

2499

" passwords from a Mandos server" };

1702

ret = argp_parse(&argp, argc, argv,

1703

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1704

switch(ret){

2500

ret_errno = argp_parse(&argp, argc, argv,

2501

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2502

switch(ret_errno){

1705

2503

case 0:

1706

2504

break;

1707

2505

case ENOMEM:

1708

2506

default:

1709

errno = ret;

2507

errno = ret_errno;

1710

2508

perror_plus("argp_parse");

1711

2509

exitcode = EX_OSERR;

1712

2510

goto end;

1715

2513

goto end;

1716

2514

}

1717

2515

}

1718

2516

1719

2517

{

1720

2518

/* Work around Debian bug #633582:

1721

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

2519

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

1722

2520

1723

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

2521

/* Re-raise privileges */

2522

ret = raise_privileges();

2523

if(ret != 0){

2524

errno = ret;

2525

perror_plus("Failed to raise privileges");

1728

2526

} else {

1729

2527

struct stat st;

1730

2528

1745

2543

}

1746

2544

}

1747

2545

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

2546

close(seckey_fd);

1749

2547

}

1750

2548

}

1751

2549

1752

2550

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

1753

2551

int pubkey_fd = open(pubkey, O_RDONLY);

1754

2552

if(pubkey_fd == -1){

1766

2564

}

1767

2565

}

1768

2566

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

2567

close(pubkey_fd);

2568

}

2569

}

2570

2571

if(dh_params_file != NULL

2572

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

2573

int dhparams_fd = open(dh_params_file, O_RDONLY);

2574

if(dhparams_fd == -1){

2575

perror_plus("open");

2576

} else {

2577

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

2578

if(ret == -1){

2579

perror_plus("fstat");

2580

} else {

2581

if(S_ISREG(st.st_mode)

2582

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

2583

ret = fchown(dhparams_fd, uid, gid);

2584

if(ret == -1){

2585

perror_plus("fchown");

2586

}

2587

}

2588

}

2589

close(dhparams_fd);

2590

}

2591

}

2592

1773

2593

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2594

ret = lower_privileges();

2595

if(ret != 0){

2596

errno = ret;

2597

perror_plus("Failed to lower privileges");

2598

}

2599

}

2600

}

2601

2602

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

2603

{

2604

char *interface = NULL;

2605

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

2606

interface))){

2607

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

2608

and if_nametoindex(interface) == 0){

2609

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

2610

fprintf_plus(stderr, "Not using nonexisting interface"

2611

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

2612

}

2613

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

2614

interface = NULL;

1778

2615

}

1779

2616

}

1780

2617

}

1781

2618

1782

2619

/* Run network hooks */

1783

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

1784

goto end;

2620

{

2621

if(mc.interfaces != NULL){

2622

interfaces_hooks = malloc(mc.interfaces_size);

2623

if(interfaces_hooks == NULL){

2624

perror_plus("malloc");

2625

goto end;

2626

}

2627

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

2628

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

2629

}

2630

run_network_hooks("start", interfaces_hooks != NULL ?

2631

interfaces_hooks : "", delay);

1785

2632

}

1786

2633

1787

2634

if(not debug){

1788

2635

avahi_set_log_function(empty_log);

1789

2636

}

1790

2637

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

1823

2638

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

1824

2639

from the signal handler */

1825

2640

/* Initialize the pseudo-RNG for Avahi */

1826

2641

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

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2642

simple_poll = avahi_simple_poll_new();

2643

if(simple_poll == NULL){

1829

2644

fprintf_plus(stderr,

1830

2645

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

1831

2646

exitcode = EX_UNAVAILABLE;

1895

2710

}

1896

2711

}

1897

2712

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

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

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2713

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

2714

if(mc.interfaces == NULL){

2715

struct dirent **direntries = NULL;

2716

/* Look for any good interfaces */

2717

ret = scandir(sys_class_net, &direntries, good_interface,

2718

alphasort);

2719

if(ret >= 1){

2720

/* Add all found interfaces to interfaces list */

2721

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

2722

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

2723

direntries[i]->d_name);

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("argz_add");

2727

free(direntries[i]);

2728

continue;

2729

}

2730

if(debug){

2731

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

2732

direntries[i]->d_name);

2733

}

2734

free(direntries[i]);

2735

}

2736

free(direntries);

2737

} else {

2738

if(ret == 0){

2739

free(direntries);

2740

}

2741

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

2742

exitcode = EXIT_FAILURE;

2743

goto end;

2744

}

2745

}

2746

2747

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

2748

{

2749

char *interface = NULL;

2750

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

2751

interface))){

2752

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

2753

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

2754

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

2755

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

2756

interface);

2757

interface = NULL;

2758

while((interface = argz_next(mc.interfaces,

2759

mc.interfaces_size, interface))){

2760

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

2761

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

2762

interface);

2763

interface = NULL;

1983

2764

}

1984

2765

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2002

2766

break;

2003

2767

}

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2768

bool interface_was_up = interface_is_up(interface);

2769

errno = bring_up_interface(interface, delay);

2770

if(not interface_was_up){

2771

if(errno != 0){

2772

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

2773

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

2774

} else {

2775

errno = argz_add(&interfaces_to_take_down,

2776

&interfaces_to_take_down_size,

2777

interface);

2778

if(errno != 0){

2779

perror_plus("argz_add");

2780

}

2781

}

2782

}

2783

}

2784

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

2785

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

2786

}

2787

}

2788

2789

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

2790

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

2791

if(debug){

2792

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

2793

mc.interfaces);

2794

}

2795

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

2033

2796

}

2034

2797

2035

2798

if(quit_now){

2036

2799

goto end;

2037

2800

}

2038

2801

2039

ret = init_gnutls_global(pubkey, seckey);

2802

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

2040

2803

if(ret == -1){

2041

2804

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

2042

2805

exitcode = EX_UNAVAILABLE;

2049

2812

goto end;

2050

2813

}

2051

2814

2052

if(mkdtemp(tempdir) == NULL){

2815

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

2816

tempdir = mkdtemp(run_tempdir);

2817

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

2818

if(debug){

2819

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

2820

run_tempdir, old_tempdir);

2821

}

2822

tempdir = mkdtemp(old_tempdir);

2823

}

2824

if(tempdir == NULL){

2053

2825

perror_plus("mkdtemp");

2054

2826

goto end;

2055

2827

}

2056

tempdir_created = true;

2057

2828

2058

2829

if(quit_now){

2059

2830

goto end;

2060

2831

}

2061

2832

2062

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

2833

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

2063

2834

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

2064

2835

exitcode = EX_UNAVAILABLE;

2065

2836

goto end;

2075

2846

/* Connect directly, do not use Zeroconf */

2076

2847

/* (Mainly meant for debugging) */

2077

2848

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

2849

2078

2850

if(address == NULL){

2079

2851

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

2080

2852

exitcode = EX_USAGE;

2085

2857

goto end;

2086

2858

}

2087

2859

2088

uint16_t port;

2860

in_port_t port;

2089

2861

errno = 0;

2090

2862

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

2091

2863

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

2092

or tmpmax != (uint16_t)tmpmax){

2864

or tmpmax != (in_port_t)tmpmax){

2093

2865

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

2094

2866

exitcode = EX_USAGE;

2095

2867

goto end;

2096

2868

}

2097

2869

2098

2870

if(quit_now){

2099

2871

goto end;

2100

2872

}

2101

2873

2102

port = (uint16_t)tmpmax;

2874

port = (in_port_t)tmpmax;

2103

2875

*address = '\0';

2104

2876

/* Colon in address indicates IPv6 */

2105

2877

int af;

2121

2893

}

2122

2894

2123

2895

while(not quit_now){

2124

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

2896

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

2897

&mc);

2125

2898

if(quit_now or ret == 0){

2126

2899

break;

2127

2900

}

2129

2902

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

2130

2903

(int)retry_interval);

2131

2904

}

2132

sleep((int)retry_interval);

2905

sleep((unsigned int)retry_interval);

2133

2906

}

2134

2907

2135

if (not quit_now){

2908

if(not quit_now){

2136

2909

exitcode = EXIT_SUCCESS;

2137

2910

}

2138

2911

2153

2926

config.publish_domain = 0;

2154

2927

2155

2928

/* Allocate a new server */

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

2929

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2930

&config, NULL, NULL, &ret);

2159

2931

2160

2932

/* Free the Avahi configuration data */

2161

2933

avahi_server_config_free(&config);

2164

2936

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

2165

2937

if(mc.server == NULL){

2166

2938

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

2167

avahi_strerror(error));

2939

avahi_strerror(ret));

2168

2940

exitcode = EX_UNAVAILABLE;

2169

2941

goto end;

2170

2942

}

2176

2948

/* Create the Avahi service browser */

2177

2949

sb = avahi_s_service_browser_new(mc.server, if_index,

2178

2950

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

NULL, 0, browse_callback, NULL);

2951

NULL, 0, browse_callback,

2952

(void *)&mc);

2180

2953

if(sb == NULL){

2181

2954

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

2182

2955

avahi_strerror(avahi_server_errno(mc.server)));

2193

2966

if(debug){

2194

2967

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

2195

2968

}

2196

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2969

2970

ret = avahi_loop_with_timeout(simple_poll,

2971

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

2199

2972

if(debug){

2200

2973

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

2201

2974

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

2204

2977

end:

2205

2978

2206

2979

if(debug){

2207

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

2980

if(signal_received){

2981

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

2982

argv[0], signal_received,

2983

strsignal(signal_received));

2984

} else {

2985

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

2986

}

2208

2987

}

2209

2988

2210

2989

/* Cleanup things */

2990

free(mc.interfaces);

2991

2211

2992

if(sb != NULL)

2212

2993

avahi_s_service_browser_free(sb);

2213

2994

2214

2995

if(mc.server != NULL)

2215

2996

avahi_server_free(mc.server);

2216

2997

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

2998

if(simple_poll != NULL)

2999

avahi_simple_poll_free(simple_poll);

2219

3000

2220

3001

if(gnutls_initialized){

2221

3002

gnutls_certificate_free_credentials(mc.cred);

2222

gnutls_global_deinit();

2223

3003

gnutls_dh_params_deinit(mc.dh_params);

2224

3004

}

2225

3005

2233

3013

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

2234

3014

while(mc.current_server != NULL){

2235

3015

server *next = mc.current_server->next;

3016

#ifdef __GNUC__

3017

#pragma GCC diagnostic push

3018

#pragma GCC diagnostic ignored "-Wcast-qual"

3019

#endif

3020

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

3021

#ifdef __GNUC__

3022

#pragma GCC diagnostic pop

3023

#endif

2236

3024

free(mc.current_server);

2237

3025

mc.current_server = next;

2238

3026

}

2239

3027

}

2240

3028

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

3029

/* Re-raise privileges */

2245

3030

{

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

3031

ret = raise_privileges();

3032

if(ret != 0){

3033

errno = ret;

3034

perror_plus("Failed to raise privileges");

3035

} else {

3036

3037

/* Run network hooks */

3038

run_network_hooks("stop", interfaces_hooks != NULL ?

3039

interfaces_hooks : "", delay);

3040

3041

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

3042

{

3043

char *interface = NULL;

3044

while((interface = argz_next(interfaces_to_take_down,

3045

interfaces_to_take_down_size,

3046

interface))){

3047

ret = take_down_interface(interface);

3048

if(ret != 0){

3049

errno = ret;

3050

perror_plus("Failed to take down interface");

3051

}

3052

}

3053

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

3054

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

3055

" down\n");

3056

}

3057

}

2250

3058

}

2251

3059

2252

/* Take down the network interface */

2253

if(take_down_interface and geteuid() == 0){

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2262

}

2263

}

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2267

}

3060

ret = lower_privileges_permanently();

3061

if(ret != 0){

3062

errno = ret;

3063

perror_plus("Failed to lower privileges permanently");

2268

3064

}

2269

3065

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

3066

3067

free(interfaces_to_take_down);

3068

free(interfaces_hooks);

3069

3070

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

3071

uintmax_t level){

3072

struct dirent **direntries = NULL;

3073

int dret;

3074

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

3075

O_RDONLY

3076

| O_NOFOLLOW

3077

| O_DIRECTORY

3078

| O_PATH));

3079

if(dir_fd == -1){

3080

perror_plus("open");

3081

return;

3082

}

3083

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

3084

notdotentries, alphasort);

3085

if(numentries >= 0){

3086

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

3087

if(debug){

3088

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

3089

dirname, direntries[i]->d_name);

3090

}

3091

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

3092

if(dret == -1){

3093

if(errno == EISDIR){

3094

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

3095

AT_REMOVEDIR);

3096

}

3097

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

3098

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

3099

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

3100

/* Recurse only in this special case */

3101

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

3102

dret = 0;

3103

}

3104

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

3105

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

3106

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

3107

}

3108

}

3109

free(direntries[i]);

3110

}

3111

3112

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

3113

free(direntries);

3114

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3115

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

3116

perror_plus("rmdir");

3117

}

3118

} else {

3119

perror_plus("scandirat");

3120

}

3121

close(dir_fd);

2275

3122

}

2276

3123

2277

3124

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

2278

if(tempdir_created){

2279

struct dirent **direntries = NULL;

2280

struct dirent *direntry = NULL;

2281

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

2282

alphasort);

2283

if (numentries > 0){

2284

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

2285

direntry = direntries[i];

2286

char *fullname = NULL;

2287

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

2288

direntry->d_name);

2289

if(ret < 0){

2290

perror_plus("asprintf");

2291

continue;

2292

}

2293

ret = remove(fullname);

2294

if(ret == -1){

2295

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

2296

strerror(errno));

2297

}

2298

free(fullname);

2299

}

2300

}

2301

2302

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

2303

free(direntries);

2304

if (numentries == -1){

2305

perror_plus("scandir");

2306

}

2307

ret = rmdir(tempdir);

2308

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

2309

perror_plus("rmdir");

2310

}

3125

if(tempdir != NULL){

3126

clean_dir_at(-1, tempdir, 0);

2311

3127

}

2312

3128

2313

3129

if(quit_now){