/mandos/release : revision 24.1.176

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

26

* along with this program. If not, see

27

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

28

*

29

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

29

* Contact the authors at <mandos@fukt.bsnet.se>.

30

*/

31

32

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

41

42

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

43

stdout, ferror(), remove() */

44

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

44

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

45

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

46

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

47

strtof(), abort() */

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

61

*/

62

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

63

strtoimax() */

64

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

64

65

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

65

66

program_invocation_short_name */

66

67

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

72

73

*/

73

74

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

74

75

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

75

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

76

setgid(), pause() */

76

77

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

77

78

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

78

79

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

84

85

raise() */

85

86

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

86

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

87

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

88

WEXITSTATUS(), WTERMSIG() */

89

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

90

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

91

argz_delete(), argz_append(),

92

argz_stringify(), argz_add(),

93

argz_count() */

94

88

95

89

#ifdef __linux__

96

90

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

114

108

init_gnutls_session(),

115

109

GNUTLS_* */

116

110

#include <gnutls/openpgp.h>

117

/* gnutls_certificate_set_openpgp_key_file(),

118

GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

119

113

120

114

/* GPGME */

121

115

#include <gpgme.h> /* All GPGME types, constants and

129

123

#define PATHDIR "/conf/conf.d/mandos"

130

124

#define SECKEY "seckey.txt"

131

125

#define PUBKEY "pubkey.txt"

132

#define HOOKDIR "/lib/mandos/network-hooks.d"

133

126

134

127

bool debug = false;

135

128

static const char mandos_protocol_version[] = "1";

136

129

const char *argp_program_version = "mandos-client " VERSION;

137

const char *argp_program_bug_address = "<mandos@recompile.se>";

130

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

138

131

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

139

132

char *connect_to = NULL;

140

const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

142

gid_t gid = 65534;

143

133

144

134

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

145

135

typedef struct server{

146

136

const char *ip;

147

in_port_t port;

137

uint16_t port;

148

138

AvahiIfIndex if_index;

149

139

int af;

150

140

struct timespec last_seen;

154

144

155

145

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

156

146

typedef struct {

147

AvahiSimplePoll *simple_poll;

157

148

AvahiServer *server;

158

149

gnutls_certificate_credentials_t cred;

159

150

unsigned int dh_bits;

161

152

const char *priority;

162

153

gpgme_ctx_t ctx;

163

154

server *current_server;

164

char *interfaces;

165

size_t interfaces_size;

166

155

} mandos_context;

167

156

168

/* global so signal handler can reach it*/

169

AvahiSimplePoll *simple_poll;

157

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

158

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

159

.dh_bits = 1024, .priority = "SECURE256"

160

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

161

.current_server = NULL };

170

162

171

163

sig_atomic_t quit_now = 0;

172

164

int signal_received = 0;

173

165

174

166

/* Function to use when printing errors */

175

167

void perror_plus(const char *print_text){

176

int e = errno;

177

168

fprintf(stderr, "Mandos plugin %s: ",

178

169

program_invocation_short_name);

179

errno = e;

180

170

perror(print_text);

181

171

}

182

172

183

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

184

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

185

va_list ap;

186

va_start (ap, format);

187

188

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

189

program_invocation_short_name));

190

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

191

}

192

193

173

/*

194

174

* Make additional room in "buffer" for at least BUFFER_SIZE more

195

175

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

196

176

* "buffer_length" is how much is already used.

197

177

*/

198

178

size_t incbuffer(char **buffer, size_t buffer_length,

199

size_t buffer_capacity){

179

size_t buffer_capacity){

200

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

181

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

202

182

if(buffer == NULL){

207

187

return buffer_capacity;

208

188

}

209

189

210

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

211

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

212

int af, server **current_server){

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

213

193

int ret;

214

194

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

215

195

if(new_server == NULL){

216

196

perror_plus("malloc");

217

return false;

197

return -1;

218

198

}

219

199

*new_server = (server){ .ip = strdup(ip),

220

.port = port,

221

.if_index = if_index,

222

.af = af };

200

.port = port,

201

.if_index = if_index,

202

.af = af };

223

203

if(new_server->ip == NULL){

224

204

perror_plus("strdup");

225

return false;

205

return -1;

226

206

}

227

/* Special case of first server */

228

if(*current_server == NULL){

207

/* unique case of first server */

208

if (mc.current_server == NULL){

229

209

new_server->next = new_server;

230

210

new_server->prev = new_server;

231

*current_server = new_server;

232

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

211

mc.current_server = new_server;

212

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

233

213

} else {

234

new_server->next = *current_server;

235

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

214

new_server->next = mc.current_server;

215

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

236

216

new_server->prev->next = new_server;

237

(*current_server)->prev = new_server;

217

mc.current_server->prev = new_server;

238

218

}

239

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

219

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

240

220

if(ret == -1){

241

221

perror_plus("clock_gettime");

242

return false;

222

return -1;

243

223

}

244

return true;

224

return 0;

245

225

}

246

226

247

227

/*

248

228

* Initialize GPGME.

249

229

*/

250

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

251

const char *tempdir, mandos_context *mc){

230

static bool init_gpgme(const char *seckey,

231

const char *pubkey, const char *tempdir){

252

232

gpgme_error_t rc;

253

233

gpgme_engine_info_t engine_info;

254

234

235

255

236

/*

256

237

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

257

238

*/

268

249

269

250

rc = gpgme_data_new_from_fd(&pgp_data, fd);

270

251

if(rc != GPG_ERR_NO_ERROR){

271

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

272

gpgme_strsource(rc), gpgme_strerror(rc));

252

fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",

253

gpgme_strsource(rc), gpgme_strerror(rc));

273

254

return false;

274

255

}

275

256

276

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

257

rc = gpgme_op_import(mc.ctx, pgp_data);

277

258

if(rc != GPG_ERR_NO_ERROR){

278

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

279

gpgme_strsource(rc), gpgme_strerror(rc));

259

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

260

gpgme_strsource(rc), gpgme_strerror(rc));

280

261

return false;

281

262

}

282

263

289

270

}

290

271

291

272

if(debug){

292

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

273

fprintf(stderr, "Initializing GPGME\n");

293

274

}

294

275

295

276

/* Init GPGME */

296

277

gpgme_check_version(NULL);

297

278

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

298

279

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

280

fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",

281

gpgme_strsource(rc), gpgme_strerror(rc));

301

282

return false;

302

283

}

303

284

304

/* Set GPGME home directory for the OpenPGP engine only */

285

/* Set GPGME home directory for the OpenPGP engine only */

305

286

rc = gpgme_get_engine_info(&engine_info);

306

287

if(rc != GPG_ERR_NO_ERROR){

307

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

308

gpgme_strsource(rc), gpgme_strerror(rc));

288

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

289

gpgme_strsource(rc), gpgme_strerror(rc));

309

290

return false;

310

291

}

311

292

while(engine_info != NULL){

317

298

engine_info = engine_info->next;

318

299

}

319

300

if(engine_info == NULL){

320

fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",

321

tempdir);

301

fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

322

302

return false;

323

303

}

324

304

325

305

/* Create new GPGME "context" */

326

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

306

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

327

307

if(rc != GPG_ERR_NO_ERROR){

328

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

329

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

330

gpgme_strerror(rc));

308

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

309

gpgme_strsource(rc), gpgme_strerror(rc));

331

310

return false;

332

311

}

333

312

344

323

*/

345

324

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

325

size_t crypto_size,

347

char **plaintext,

348

mandos_context *mc){

326

char **plaintext){

349

327

gpgme_data_t dh_crypto, dh_plain;

350

328

gpgme_error_t rc;

351

329

ssize_t ret;

353

331

ssize_t plaintext_length = 0;

354

332

355

333

if(debug){

356

fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");

334

fprintf(stderr, "Trying to decrypt OpenPGP data\n");

357

335

}

358

336

359

337

/* Create new GPGME data buffer from memory cryptotext */

360

338

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

361

339

0);

362

340

if(rc != GPG_ERR_NO_ERROR){

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

341

fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

342

gpgme_strsource(rc), gpgme_strerror(rc));

365

343

return -1;

366

344

}

367

345

368

346

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

369

347

rc = gpgme_data_new(&dh_plain);

370

348

if(rc != GPG_ERR_NO_ERROR){

371

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

372

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

373

gpgme_strsource(rc), gpgme_strerror(rc));

349

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

350

gpgme_strsource(rc), gpgme_strerror(rc));

374

351

gpgme_data_release(dh_crypto);

375

352

return -1;

376

353

}

377

354

378

355

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

379

356

data buffer */

380

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

357

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

381

358

if(rc != GPG_ERR_NO_ERROR){

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

384

361

plaintext_length = -1;

385

362

if(debug){

386

363

gpgme_decrypt_result_t result;

387

result = gpgme_op_decrypt_result(mc->ctx);

364

result = gpgme_op_decrypt_result(mc.ctx);

388

365

if(result == NULL){

389

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

366

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

390

367

} else {

391

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

392

result->unsupported_algorithm);

393

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

394

result->wrong_key_usage);

368

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

369

result->unsupported_algorithm);

370

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

371

result->wrong_key_usage);

395

372

if(result->file_name != NULL){

396

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

373

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

397

374

}

398

375

gpgme_recipient_t recipient;

399

376

recipient = result->recipients;

400

377

while(recipient != NULL){

401

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

402

gpgme_pubkey_algo_name

403

(recipient->pubkey_algo));

404

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

405

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

406

recipient->status == GPG_ERR_NO_SECKEY

407

? "No" : "Yes");

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

408

384

recipient = recipient->next;

409

385

}

410

386

}

413

389

}

414

390

415

391

if(debug){

416

fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");

392

fprintf(stderr, "Decryption of OpenPGP data succeeded\n");

417

393

}

418

394

419

395

/* Seek back to the beginning of the GPGME plaintext data buffer */

426

402

*plaintext = NULL;

427

403

while(true){

428

404

plaintext_capacity = incbuffer(plaintext,

429

(size_t)plaintext_length,

430

plaintext_capacity);

405

(size_t)plaintext_length,

406

plaintext_capacity);

431

407

if(plaintext_capacity == 0){

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

408

perror_plus("incbuffer");

409

plaintext_length = -1;

410

goto decrypt_end;

435

411

}

436

412

437

413

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

450

426

}

451

427

452

428

if(debug){

453

fprintf_plus(stderr, "Decrypted password is: ");

429

fprintf(stderr, "Decrypted password is: ");

454

430

for(ssize_t i = 0; i < plaintext_length; i++){

455

431

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

456

432

}

468

444

}

469

445

470

446

static const char * safer_gnutls_strerror(int value){

471

const char *ret = gnutls_strerror(value);

447

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

448

-Wunreachable-code */

472

449

if(ret == NULL)

473

450

ret = "(unknown)";

474

451

return ret;

477

454

/* GnuTLS log function callback */

478

455

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

479

456

const char* string){

480

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

457

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

481

458

}

482

459

483

460

static int init_gnutls_global(const char *pubkeyfilename,

484

const char *seckeyfilename,

485

mandos_context *mc){

461

const char *seckeyfilename){

486

462

int ret;

487

463

488

464

if(debug){

489

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

465

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

490

466

}

491

467

492

468

ret = gnutls_global_init();

493

469

if(ret != GNUTLS_E_SUCCESS){

494

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

495

safer_gnutls_strerror(ret));

470

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

471

safer_gnutls_strerror(ret));

496

472

return -1;

497

473

}

498

474

505

481

}

506

482

507

483

/* OpenPGP credentials */

508

ret = gnutls_certificate_allocate_credentials(&mc->cred);

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

509

485

if(ret != GNUTLS_E_SUCCESS){

510

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

511

safer_gnutls_strerror(ret));

486

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

487

safer_gnutls_strerror(ret));

512

488

gnutls_global_deinit();

513

489

return -1;

514

490

}

515

491

516

492

if(debug){

517

fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"

518

" secret key %s as GnuTLS credentials\n",

519

pubkeyfilename,

520

seckeyfilename);

493

fprintf(stderr, "Attempting to use OpenPGP public key %s and"

494

" secret key %s as GnuTLS credentials\n", pubkeyfilename,

495

seckeyfilename);

521

496

}

522

497

523

498

ret = gnutls_certificate_set_openpgp_key_file

524

(mc->cred, pubkeyfilename, seckeyfilename,

499

(mc.cred, pubkeyfilename, seckeyfilename,

525

500

GNUTLS_OPENPGP_FMT_BASE64);

526

501

if(ret != GNUTLS_E_SUCCESS){

527

fprintf_plus(stderr,

528

"Error[%d] while reading the OpenPGP key pair ('%s',"

529

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

530

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

531

safer_gnutls_strerror(ret));

502

fprintf(stderr,

503

"Error[%d] while reading the OpenPGP key pair ('%s',"

504

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

505

fprintf(stderr, "The GnuTLS error is: %s\n",

506

safer_gnutls_strerror(ret));

532

507

goto globalfail;

533

508

}

534

509

535

510

/* GnuTLS server initialization */

536

ret = gnutls_dh_params_init(&mc->dh_params);

511

ret = gnutls_dh_params_init(&mc.dh_params);

537

512

if(ret != GNUTLS_E_SUCCESS){

538

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

539

" initialization: %s\n",

540

safer_gnutls_strerror(ret));

513

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

514

" %s\n", safer_gnutls_strerror(ret));

541

515

goto globalfail;

542

516

}

543

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

517

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

544

518

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

519

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

520

safer_gnutls_strerror(ret));

547

521

goto globalfail;

548

522

}

549

523

550

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

524

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

551

525

552

526

return 0;

553

527

554

528

globalfail:

555

529

556

gnutls_certificate_free_credentials(mc->cred);

530

gnutls_certificate_free_credentials(mc.cred);

557

531

gnutls_global_deinit();

558

gnutls_dh_params_deinit(mc->dh_params);

532

gnutls_dh_params_deinit(mc.dh_params);

559

533

return -1;

560

534

}

561

535

562

static int init_gnutls_session(gnutls_session_t *session,

563

mandos_context *mc){

536

static int init_gnutls_session(gnutls_session_t *session){

564

537

int ret;

565

538

/* GnuTLS session creation */

566

539

do {

570

543

}

571

544

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

572

545

if(ret != GNUTLS_E_SUCCESS){

573

fprintf_plus(stderr,

574

"Error in GnuTLS session initialization: %s\n",

575

safer_gnutls_strerror(ret));

546

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

547

safer_gnutls_strerror(ret));

576

548

}

577

549

578

550

{

579

551

const char *err;

580

552

do {

581

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

553

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

582

554

if(quit_now){

583

555

gnutls_deinit(*session);

584

556

return -1;

585

557

}

586

558

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

587

559

if(ret != GNUTLS_E_SUCCESS){

588

fprintf_plus(stderr, "Syntax error at: %s\n", err);

589

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

590

safer_gnutls_strerror(ret));

560

fprintf(stderr, "Syntax error at: %s\n", err);

561

fprintf(stderr, "GnuTLS error: %s\n",

562

safer_gnutls_strerror(ret));

591

563

gnutls_deinit(*session);

592

564

return -1;

593

565

}

595

567

596

568

do {

597

569

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc->cred);

570

mc.cred);

599

571

if(quit_now){

600

572

gnutls_deinit(*session);

601

573

return -1;

602

574

}

603

575

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

604

576

if(ret != GNUTLS_E_SUCCESS){

605

fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",

606

safer_gnutls_strerror(ret));

577

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

578

safer_gnutls_strerror(ret));

607

579

gnutls_deinit(*session);

608

580

return -1;

609

581

}

611

583

/* ignore client certificate if any. */

612

584

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

585

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

615

587

616

588

return 0;

617

589

}

621

593

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

622

594

623

595

/* Called when a Mandos server is found */

624

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

596

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

625

597

AvahiIfIndex if_index,

626

int af, mandos_context *mc){

598

int af){

627

599

int ret, tcp_sd = -1;

628

600

ssize_t sret;

629

601

union {

654

626

pf = PF_INET;

655

627

break;

656

628

default:

657

fprintf_plus(stderr, "Bad address family: %d\n", af);

629

fprintf(stderr, "Bad address family: %d\n", af);

658

630

errno = EINVAL;

659

631

return -1;

660

632

}

661

633

662

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

663

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

664

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

665

bool match = false;

666

{

667

char *interface = NULL;

668

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

669

interface))){

670

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

671

match = true;

672

break;

673

}

674

}

675

}

676

if(not match){

677

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

678

connect to the server */

679

if(debug){

680

char interface[IF_NAMESIZE];

681

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

682

perror_plus("if_indextoname");

683

} else {

684

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

685

" \"%s\"\n",

686

if_indextoname((unsigned int)if_index,

687

interface));

688

}

689

}

690

return -1;

691

}

692

}

693

694

ret = init_gnutls_session(&session, mc);

634

ret = init_gnutls_session(&session);

695

635

if(ret != 0){

696

636

return -1;

697

637

}

698

638

699

639

if(debug){

700

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

701

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

640

fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16

641

"\n", ip, port);

702

642

}

703

643

704

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

730

670

}

731

671

if(ret == 0){

732

672

int e = errno;

733

fprintf_plus(stderr, "Bad address: %s\n", ip);

673

fprintf(stderr, "Bad address: %s\n", ip);

734

674

errno = e;

735

675

goto mandos_end;

736

676

}

737

677

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

678

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

679

-Wconversion and

680

-Wunreachable-code */

681

739

682

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

683

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

741

-Wunreachable-code*/

684

-Wunreachable-code*/

742

685

if(if_index == AVAHI_IF_UNSPEC){

743

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

744

" incomplete without a network interface\n");

686

fprintf(stderr, "An IPv6 link-local address is incomplete"

687

" without a network interface\n");

745

688

errno = EINVAL;

746

689

goto mandos_end;

747

690

}

765

708

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

766

709

perror_plus("if_indextoname");

767

710

} else {

768

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

769

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

711

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

712

ip, interface, port);

770

713

}

771

714

} else {

772

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

773

ip, (uintmax_t)port);

715

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

716

port);

774

717

}

775

718

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

719

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

786

729

perror_plus("inet_ntop");

787

730

} else {

788

731

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

789

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

732

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

790

733

}

791

734

}

792

735

}

820

763

while(true){

821

764

size_t out_size = strlen(out);

822

765

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

823

out_size - written));

766

out_size - written));

824

767

if(ret == -1){

825

768

int e = errno;

826

769

perror_plus("write");

846

789

}

847

790

848

791

if(debug){

849

fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);

792

fprintf(stderr, "Establishing TLS session with %s\n", ip);

850

793

}

851

794

852

795

if(quit_now){

854

797

goto mandos_end;

855

798

}

856

799

857

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

858

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

859

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

860

gnutls_transport_set_ptr(session,

861

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

800

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

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

862

802

863

803

if(quit_now){

864

804

errno = EINTR;

875

815

876

816

if(ret != GNUTLS_E_SUCCESS){

877

817

if(debug){

878

fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");

818

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

879

819

gnutls_perror(ret);

880

820

}

881

821

errno = EPROTO;

885

825

/* Read OpenPGP packet that contains the wanted password */

886

826

887

827

if(debug){

888

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

889

" %s\n", ip);

828

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

829

ip);

890

830

}

891

831

892

832

while(true){

897

837

}

898

838

899

839

buffer_capacity = incbuffer(&buffer, buffer_length,

900

buffer_capacity);

840

buffer_capacity);

901

841

if(buffer_capacity == 0){

902

842

int e = errno;

903

843

perror_plus("incbuffer");

930

870

}

931

871

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

932

872

if(ret < 0){

933

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "

934

"***\n");

873

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

935

874

gnutls_perror(ret);

936

875

errno = EPROTO;

937

876

goto mandos_end;

938

877

}

939

878

break;

940

879

default:

941

fprintf_plus(stderr, "Unknown error while reading data from"

942

" encrypted session with Mandos server\n");

880

fprintf(stderr, "Unknown error while reading data from"

881

" encrypted session with Mandos server\n");

943

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

944

883

errno = EIO;

945

884

goto mandos_end;

950

889

}

951

890

952

891

if(debug){

953

fprintf_plus(stderr, "Closing TLS session\n");

892

fprintf(stderr, "Closing TLS session\n");

954

893

}

955

894

956

895

if(quit_now){

968

907

969

908

if(buffer_length > 0){

970

909

ssize_t decrypted_buffer_size;

971

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

972

&decrypted_buffer, mc);

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

buffer_length,

912

&decrypted_buffer);

973

913

if(decrypted_buffer_size >= 0){

974

914

975

915

written = 0;

985

925

if(ret == 0 and ferror(stdout)){

986

926

int e = errno;

987

927

if(debug){

988

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

989

strerror(errno));

928

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

929

strerror(errno));

990

930

}

991

931

errno = e;

992

932

goto mandos_end;

1036

976

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

977

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

978

flags,

1039

void* mc){

1040

if(r == NULL){

1041

return;

1042

}

979

AVAHI_GCC_UNUSED void* userdata){

980

assert(r);

1043

981

1044

982

/* Called whenever a service has been resolved successfully or

1045

983

timed out */

1051

989

switch(event){

1052

990

default:

1053

991

case AVAHI_RESOLVER_FAILURE:

1054

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

1055

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

1056

domain,

1057

avahi_strerror(avahi_server_errno

1058

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

992

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

993

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

994

avahi_strerror(avahi_server_errno(mc.server)));

1059

995

break;

1060

996

1061

997

case AVAHI_RESOLVER_FOUND:

1063

999

char ip[AVAHI_ADDRESS_STR_MAX];

1064

1000

avahi_address_snprint(ip, sizeof(ip), address);

1065

1001

if(debug){

1066

fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"

1067

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

1068

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

1002

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

1003

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

1004

ip, (intmax_t)interface, port);

1069

1005

}

1070

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

1071

interface,

1072

avahi_proto_to_af(proto),

1073

mc);

1006

int ret = start_mandos_communication(ip, port, interface,

1007

avahi_proto_to_af(proto));

1074

1008

if(ret == 0){

1075

avahi_simple_poll_quit(simple_poll);

1009

avahi_simple_poll_quit(mc.simple_poll);

1076

1010

} else {

1077

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

1078

avahi_proto_to_af(proto),

1079

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

1080

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

1081

" list\n", name);

1082

}

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1083

1013

}

1084

1014

}

1085

1015

}

1095

1025

const char *domain,

1096

1026

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1027

flags,

1098

void* mc){

1099

if(b == NULL){

1100

return;

1101

}

1028

AVAHI_GCC_UNUSED void* userdata){

1029

assert(b);

1102

1030

1103

1031

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

1104

1032

is removed from the LAN */

1111

1039

default:

1112

1040

case AVAHI_BROWSER_FAILURE:

1113

1041

1114

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

1115

avahi_strerror(avahi_server_errno

1116

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

1117

avahi_simple_poll_quit(simple_poll);

1042

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

1043

avahi_strerror(avahi_server_errno(mc.server)));

1044

avahi_simple_poll_quit(mc.simple_poll);

1118

1045

return;

1119

1046

1120

1047

case AVAHI_BROWSER_NEW:

1123

1050

the callback function is called the Avahi server will free the

1124

1051

resolver for us. */

1125

1052

1126

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

1127

interface, protocol, name, type,

1128

domain, protocol, 0,

1129

resolve_callback, mc) == NULL)

1130

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

1131

" %s\n", name,

1132

avahi_strerror(avahi_server_errno

1133

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

1053

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

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

1056

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

1057

name, avahi_strerror(avahi_server_errno(mc.server)));

1134

1058

break;

1135

1059

1136

1060

case AVAHI_BROWSER_REMOVE:

1139

1063

case AVAHI_BROWSER_ALL_FOR_NOW:

1140

1064

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1141

1065

if(debug){

1142

fprintf_plus(stderr, "No Mandos server found, still"

1143

" searching...\n");

1066

fprintf(stderr, "No Mandos server found, still searching...\n");

1144

1067

}

1145

1068

break;

1146

1069

}

1155

1078

signal_received = sig;

1156

1079

int old_errno = errno;

1157

1080

/* set main loop to exit */

1158

if(simple_poll != NULL){

1159

avahi_simple_poll_quit(simple_poll);

1081

if(mc.simple_poll != NULL){

1082

avahi_simple_poll_quit(mc.simple_poll);

1160

1083

}

1161

1084

errno = old_errno;

1162

1085

}

1163

1086

1164

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

1165

int ret;

1166

error_t ret_errno;

1167

1168

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

1169

if(s < 0){

1170

ret_errno = errno;

1171

perror_plus("socket");

1172

errno = ret_errno;

1173

return false;

1174

}

1175

strcpy(ifr->ifr_name, ifname);

1176

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

if(ret == -1){

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1112

/* read line from flags_fd */

1113

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1114

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1115

flagstring[(size_t)to_read] = '\0';

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

tmpmax = strtoimax(flagstring, &tmp, 0);

1140

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1178

1143

if(debug){

1179

ret_errno = errno;

1180

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1144

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1145

flagstring, if_entry->d_name);

1182

1146

}

1183

return false;

1147

free(flagstring);

1148

return 0;

1184

1149

}

1185

return true;

1186

}

1187

1188

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

1189

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1190

1152

/* Reject the loopback device */

1191

if(ifr->ifr_flags & IFF_LOOPBACK){

1153

if(flags & IFF_LOOPBACK){

1192

1154

if(debug){

1193

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

1194

ifname);

1155

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1156

if_entry->d_name);

1195

1157

}

1196

return false;

1158

return 0;

1197

1159

}

1198

1160

/* Accept point-to-point devices only if connect_to is specified */

1199

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1161

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1200

1162

if(debug){

1201

fprintf_plus(stderr, "Accepting point-to-point interface"

1202

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

1163

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1164

if_entry->d_name);

1203

1165

}

1204

return true;

1166

return 1;

1205

1167

}

1206

1168

/* Otherwise, reject non-broadcast-capable devices */

1207

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1169

if(not (flags & IFF_BROADCAST)){

1208

1170

if(debug){

1209

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1210

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

1171

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1172

if_entry->d_name);

1211

1173

}

1212

return false;

1174

return 0;

1213

1175

}

1214

1176

/* Reject non-ARP interfaces (including dummy interfaces) */

1215

if(ifr->ifr_flags & IFF_NOARP){

1177

if(flags & IFF_NOARP){

1216

1178

if(debug){

1217

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

1218

ifname);

1179

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",

1180

if_entry->d_name);

1219

1181

}

1220

return false;

1182

return 0;

1221

1183

}

1222

1223

1184

/* Accept this device */

1224

1185

if(debug){

1225

fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);

1226

}

1227

return true;

1228

}

1229

1230

/*

1231

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

1232

* corresponds to an acceptable network device.

1233

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

1234

*/

1235

int good_interface(const struct dirent *if_entry){

1236

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

1237

return 0;

1238

}

1239

1240

struct ifreq ifr;

1241

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

1242

if(debug){

1243

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

1244

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

1245

}

1246

return 0;

1247

}

1248

1249

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

1250

return 0;

1186

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1187

if_entry->d_name);

1251

1188

}

1252

1189

return 1;

1253

1190

}

1254

1191

1255

/*

1256

* This function determines if a network interface is up.

1257

*/

1258

bool interface_is_up(const char *interface){

1259

struct ifreq ifr;

1260

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

1261

if(debug){

1262

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

1263

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

1264

}

1265

return false;

1266

}

1267

1268

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

1269

}

1270

1271

/*

1272

* This function determines if a network interface is running

1273

*/

1274

bool interface_is_running(const char *interface){

1275

struct ifreq ifr;

1276

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

1277

if(debug){

1278

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

1279

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

1280

}

1281

return false;

1282

}

1283

1284

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

1285

}

1286

1287

1192

int notdotentries(const struct dirent *direntry){

1288

1193

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

1289

1194

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

1295

1200

return 1;

1296

1201

}

1297

1202

1298

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

1299

int runnable_hook(const struct dirent *direntry){

1300

int ret;

1301

size_t sret;

1302

struct stat st;

1303

1304

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

1305

/* Empty name? */

1306

return 0;

1307

}

1308

1309

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

1310

"abcdefghijklmnopqrstuvwxyz"

1311

"0123456789"

1312

"_-");

1313

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

1314

/* Contains non-allowed characters */

1315

if(debug){

1316

fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",

1317

direntry->d_name);

1318

}

1319

return 0;

1320

}

1321

1322

char *fullname = NULL;

1323

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

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

1330

if(ret == -1){

1331

if(debug){

1332

perror_plus("Could not stat hook");

1333

}

1334

return 0;

1335

}

1336

if(not (S_ISREG(st.st_mode))){

1337

/* Not a regular file */

1338

if(debug){

1339

fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",

1340

direntry->d_name);

1341

}

1342

return 0;

1343

}

1344

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1345

/* Not executable */

1346

if(debug){

1347

fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",

1348

direntry->d_name);

1349

}

1350

return 0;

1351

}

1352

if(debug){

1353

fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",

1354

direntry->d_name);

1355

}

1356

return 1;

1357

}

1358

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

mandos_context *mc){

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1361

1204

int ret;

1362

1205

struct timespec now;

1363

1206

struct timespec waited_time;

1364

1207

intmax_t block_time;

1365

1208

1366

1209

while(true){

1367

if(mc->current_server == NULL){

1210

if(mc.current_server == NULL){

1368

1211

if (debug){

1369

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

1370

" No timeout!\n");

1212

fprintf(stderr,

1213

"Wait until first server is found. No timeout!\n");

1371

1214

}

1372

1215

ret = avahi_simple_poll_iterate(s, -1);

1373

1216

} else {

1374

1217

if (debug){

1375

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

1376

" it, or wait\n");

1218

fprintf(stderr, "Check current_server if we should run it,"

1219

" or wait\n");

1377

1220

}

1378

1221

/* the current time */

1379

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1384

1227

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

1385

1228

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

1386

1229

waited_time.tv_sec = (now.tv_sec

1387

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

1230

- mc.current_server->last_seen.tv_sec);

1388

1231

waited_time.tv_nsec = (now.tv_nsec

1389

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

1232

- mc.current_server->last_seen.tv_nsec);

1390

1233

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

1391

1234

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

1392

1235

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

1393

1236

block_time = ((retry_interval

1394

1237

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

1395

1238

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

1396

1239

1397

1240

if (debug){

1398

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

1399

block_time);

1241

fprintf(stderr, "Blocking for %ld ms\n", block_time);

1400

1242

}

1401

1243

1402

1244

if(block_time <= 0){

1403

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

1404

mc->current_server->port,

1405

mc->current_server->if_index,

1406

mc->current_server->af, mc);

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1407

1249

if(ret == 0){

1408

avahi_simple_poll_quit(s);

1250

avahi_simple_poll_quit(mc.simple_poll);

1409

1251

return 0;

1410

1252

}

1411

1253

ret = clock_gettime(CLOCK_MONOTONIC,

1412

&mc->current_server->last_seen);

1254

&mc.current_server->last_seen);

1413

1255

if(ret == -1){

1414

1256

perror_plus("clock_gettime");

1415

1257

return -1;

1416

1258

}

1417

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

1259

mc.current_server = mc.current_server->next;

1418

1260

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

1419

1261

servers, but don't block */

1420

1262

}

1422

1264

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

1423

1265

}

1424

1266

if(ret != 0){

1425

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

1267

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

1426

1268

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

1427

1269

}

1428

1270

}

1429

1271

}

1430

1272

}

1431

1273

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

const float delay){

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

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

1490

alphasort);

1491

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1499

}

1500

} else {

1501

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

1502

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

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

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

1506

if(ret < 0){

1507

perror_plus("asprintf");

1508

continue;

1509

}

1510

if(debug){

1511

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

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

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

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

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

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

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

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

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

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

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

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

1566

free(delaystring);

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

1578

} else {

1579

int status;

1580

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

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

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

1588

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

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

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

1595

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

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

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

1601

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

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

1615

}

1616

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1623

struct ifreq network;

1624

unsigned int if_index = if_nametoindex(interface);

1625

if(if_index == 0){

1626

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

1627

errno = old_errno;

1628

return ENXIO;

1629

}

1630

1631

if(quit_now){

1632

errno = old_errno;

1633

return EINTR;

1634

}

1635

1636

if(not interface_is_up(interface)){

1637

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

1638

ret_errno = errno;

1639

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

1640

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

1641

return ret_errno;

1642

}

1643

network.ifr_flags |= IFF_UP;

1644

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1647

ret_errno = errno;

1648

perror_plus("socket");

1649

errno = old_errno;

1650

return ret_errno;

1651

}

1652

1653

if(quit_now){

1654

close(sd);

1655

errno = old_errno;

1656

return EINTR;

1657

}

1658

1659

if(debug){

1660

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

1661

interface);

1662

}

1663

1664

/* Raise priviliges */

1665

raise_privileges();

1666

1667

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1675

}

1676

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret_linux = klogctl(7, NULL, 0);

1682

if(ret_linux == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

1688

/* Lower privileges */

1689

lower_privileges();

1690

1691

/* Close the socket */

1692

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

1693

if(ret == -1){

1694

perror_plus("close");

1695

}

1696

1697

if(ret_setflags == -1){

1698

errno = ret_errno;

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

errno = old_errno;

1701

return ret_errno;

1702

}

1703

} else if(debug){

1704

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

1705

interface);

1706

}

1707

1708

/* Sleep checking until interface is running.

1709

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

1710

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

1711

if(interface_is_running(interface)){

1712

break;

1713

}

1714

struct timespec sleeptime = { .tv_nsec = 250000000 };

1715

ret = nanosleep(&sleeptime, NULL);

1716

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

1717

perror_plus("nanosleep");

1718

}

1719

}

1720

1721

errno = old_errno;

1722

return 0;

1723

}

1724

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

struct ifreq network;

1731

unsigned int if_index = if_nametoindex(interface);

1732

if(if_index == 0){

1733

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

1734

errno = old_errno;

1735

return ENXIO;

1736

}

1737

if(interface_is_up(interface)){

1738

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

1739

ret_errno = errno;

1740

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

1741

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

1742

return ret_errno;

1743

}

1744

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

1745

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1748

ret_errno = errno;

1749

perror_plus("socket");

1750

errno = old_errno;

1751

return ret_errno;

1752

}

1753

1754

if(debug){

1755

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

1756

interface);

1757

}

1758

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1767

1768

/* Close the socket */

1769

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

1770

if(ret == -1){

1771

perror_plus("close");

1772

}

1773

1774

if(ret_setflags == -1){

1775

errno = ret_errno;

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

errno = old_errno;

1778

return ret_errno;

1779

}

1780

} else if(debug){

1781

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

1782

interface);

1783

}

1784

1785

errno = old_errno;

1786

return 0;

1787

}

1788

1789

1274

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

1794

1275

AvahiSServiceBrowser *sb = NULL;

1795

error_t ret_errno;

1276

int error;

1796

1277

int ret;

1797

1278

intmax_t tmpmax;

1798

1279

char *tmp;

1799

1280

int exitcode = EXIT_SUCCESS;

1800

char *interfaces_to_take_down = NULL;

1801

size_t interfaces_to_take_down_size = 0;

1281

const char *interface = "";

1282

struct ifreq network;

1283

int sd = -1;

1284

bool take_down_interface = false;

1285

uid_t uid;

1286

gid_t gid;

1802

1287

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

1803

1288

bool tempdir_created = false;

1804

1289

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

1290

const char *seckey = PATHDIR "/" SECKEY;

1806

1291

const char *pubkey = PATHDIR "/" PUBKEY;

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

1292

1810

1293

bool gnutls_initialized = false;

1811

1294

bool gpgme_initialized = false;

1873

1356

.group = 2 },

1874

1357

{ .name = "retry", .key = 132,

1875

1358

.arg = "SECONDS",

1876

.doc = "Retry interval used when denied by the Mandos server",

1877

.group = 2 },

1878

{ .name = "network-hook-dir", .key = 133,

1879

.arg = "DIR",

1880

.doc = "Directory where network hooks are located",

1359

.doc = "Retry interval used when denied by the mandos server",

1881

1360

.group = 2 },

1882

1361

/*

1883

1362

* These reproduce what we would get without ARGP_NO_HELP

1902

1381

connect_to = arg;

1903

1382

break;

1904

1383

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

1905

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

1906

arg, (int)',');

1907

if(ret_errno != 0){

1908

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

1909

}

1384

interface = arg;

1910

1385

break;

1911

1386

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

1912

1387

seckey = arg;

1936

1411

errno = 0;

1937

1412

retry_interval = strtod(arg, &tmp);

1938

1413

if(errno != 0 or tmp == arg or *tmp != '\0'

1939

or (retry_interval * 1000) > INT_MAX

1940

or retry_interval < 0){

1414

or (retry_interval * 1000) > INT_MAX){

1941

1415

argp_error(state, "Bad retry interval");

1942

1416

}

1943

1417

break;

1944

case 133: /* --network-hook-dir */

1945

hookdir = arg;

1946

break;

1947

1418

/*

1948

1419

* These reproduce what we would get without ARGP_NO_HELP

1949

1420

*/

1955

1426

argp_state_help(state, state->out_stream,

1956

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1957

1428

case 'V': /* --version */

1958

fprintf_plus(state->out_stream, "%s\n", argp_program_version);

1429

fprintf(state->out_stream, "%s\n", argp_program_version);

1959

1430

exit(argp_err_exit_status);

1960

1431

break;

1961

1432

default:

1988

1459

{

1989

1460

/* Work around Debian bug #633582:

1990

1461

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

1462

struct stat st;

1991

1463

1992

1464

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

1994

struct stat st;

1995

1996

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

1997

int seckey_fd = open(seckey, O_RDONLY);

1998

if(seckey_fd == -1){

1999

perror_plus("open");

2000

} else {

2001

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

2002

if(ret == -1){

2003

perror_plus("fstat");

2004

} else {

2005

if(S_ISREG(st.st_mode)

2006

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

2007

ret = fchown(seckey_fd, uid, gid);

2008

if(ret == -1){

2009

perror_plus("fchown");

2010

}

2011

}

2012

}

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2014

}

2015

}

2016

2017

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

2018

int pubkey_fd = open(pubkey, O_RDONLY);

2019

if(pubkey_fd == -1){

2020

perror_plus("open");

2021

} else {

2022

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

2023

if(ret == -1){

2024

perror_plus("fstat");

2025

} else {

2026

if(S_ISREG(st.st_mode)

2027

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

2028

ret = fchown(pubkey_fd, uid, gid);

2029

if(ret == -1){

2030

perror_plus("fchown");

2031

}

2032

}

2033

}

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2038

/* Lower privileges */

2039

lower_privileges();

2040

}

2041

}

2042

2043

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

2044

{

2045

char *interface = NULL;

2046

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

2047

interface))){

2048

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

2049

and if_nametoindex(interface) == 0){

2050

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

2051

fprintf_plus(stderr, "Not using nonexisting interface"

2052

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

2053

}

2054

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

2055

interface = NULL;

2056

}

2057

}

2058

}

2059

2060

/* Run network hooks */

2061

{

2062

if(mc.interfaces != NULL){

2063

interfaces_hooks = malloc(mc.interfaces_size);

2064

if(interfaces_hooks == NULL){

2065

perror_plus("malloc");

2066

goto end;

2067

}

2068

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

1465

errno = 0;

1466

ret = seteuid(0);

1467

if(ret == -1){

1468

perror_plus("seteuid");

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

2076

1512

}

2077

1513

}

2078

1514

2079

1515

if(not debug){

2080

1516

avahi_set_log_function(empty_log);

2081

1517

}

1518

1519

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

1520

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1522

alphasort);

1523

if(ret >= 1){

1524

/* Pick the first good interface */

1525

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

1526

if(debug){

1527

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

1528

}

1529

if(interface == NULL){

1530

perror_plus("malloc");

1531

free(direntries);

1532

exitcode = EXIT_FAILURE;

1533

goto end;

1534

}

1535

free(direntries);

1536

} else {

1537

free(direntries);

1538

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

1539

exitcode = EXIT_FAILURE;

1540

goto end;

1541

}

1542

}

2082

1543

2083

1544

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

2084

1545

from the signal handler */

2085

1546

/* Initialize the pseudo-RNG for Avahi */

2086

1547

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

2087

simple_poll = avahi_simple_poll_new();

2088

if(simple_poll == NULL){

2089

fprintf_plus(stderr,

2090

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

1548

mc.simple_poll = avahi_simple_poll_new();

1549

if(mc.simple_poll == NULL){

1550

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

2091

1551

exitcode = EX_UNAVAILABLE;

2092

1552

goto end;

2093

1553

}

2155

1615

}

2156

1616

}

2157

1617

2158

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

2159

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2161

/* Look for any good interfaces */

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2163

alphasort);

2164

if(ret >= 1){

2165

/* Add all found interfaces to interfaces list */

2166

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

2167

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

2168

direntries[i]->d_name);

2169

if(ret_errno != 0){

2170

perror_plus("argz_add");

2171

continue;

2172

}

2173

if(debug){

2174

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

2175

direntries[i]->d_name);

2176

}

2177

}

2178

free(direntries);

2179

} else {

2180

free(direntries);

2181

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

2182

exitcode = EXIT_FAILURE;

2183

goto end;

2184

}

2185

}

2186

2187

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

2188

{

2189

char *interface = NULL;

2190

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

2191

interface))){

2192

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

2193

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

2194

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

2195

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

2196

interface);

2197

interface = NULL;

2198

while((interface = argz_next(mc.interfaces,

2199

mc.interfaces_size, interface))){

2200

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

2201

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

2202

interface);

2203

interface = NULL;

1618

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

1619

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

1620

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

if(if_index == 0){

1622

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

1623

exitcode = EX_UNAVAILABLE;

1624

goto end;

1625

}

1626

1627

if(quit_now){

1628

goto end;

1629

}

1630

1631

/* Re-raise priviliges */

1632

errno = 0;

1633

ret = seteuid(0);

1634

if(ret == -1){

1635

perror_plus("seteuid");

1636

}

1637

1638

#ifdef __linux__

1639

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1640

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

1641

ret = klogctl(8, NULL, 5);

1642

bool restore_loglevel = true;

1643

if(ret == -1){

1644

restore_loglevel = false;

1645

perror_plus("klogctl");

1646

}

1647

#endif /* __linux__ */

1648

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1651

perror_plus("socket");

1652

exitcode = EX_OSERR;

1653

#ifdef __linux__

1654

if(restore_loglevel){

1655

ret = klogctl(7, NULL, 0);

1656

if(ret == -1){

1657

perror_plus("klogctl");

1658

}

1659

}

1660

#endif /* __linux__ */

1661

/* Lower privileges */

1662

errno = 0;

1663

ret = seteuid(uid);

1664

if(ret == -1){

1665

perror_plus("seteuid");

1666

}

1667

goto end;

1668

}

1669

strcpy(network.ifr_name, interface);

1670

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

1671

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1673

#ifdef __linux__

1674

if(restore_loglevel){

1675

ret = klogctl(7, NULL, 0);

1676

if(ret == -1){

1677

perror_plus("klogctl");

1678

}

1679

}

1680

#endif /* __linux__ */

1681

exitcode = EX_OSERR;

1682

/* Lower privileges */

1683

errno = 0;

1684

ret = seteuid(uid);

1685

if(ret == -1){

1686

perror_plus("seteuid");

1687

}

1688

goto end;

1689

}

1690

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

1691

network.ifr_flags |= IFF_UP;

1692

take_down_interface = true;

1693

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

1694

if(ret == -1){

1695

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

exitcode = EX_OSERR;

1698

#ifdef __linux__

1699

if(restore_loglevel){

1700

ret = klogctl(7, NULL, 0);

1701

if(ret == -1){

1702

perror_plus("klogctl");

2204

1703

}

2205

1704

}

1705

#endif /* __linux__ */

1706

/* Lower privileges */

1707

errno = 0;

1708

ret = seteuid(uid);

1709

if(ret == -1){

1710

perror_plus("seteuid");

1711

}

1712

goto end;

1713

}

1714

}

1715

/* Sleep checking until interface is running.

1716

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

1717

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

1718

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

1719

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1721

} else if(network.ifr_flags & IFF_RUNNING){

2206

1722

break;

2207

1723

}

2208

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2210

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2214

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2218

}

2219

}

2220

}

2221

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

2222

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

2223

}

2224

}

2225

2226

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

2227

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

2228

if(debug){

2229

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

2230

mc.interfaces);

2231

}

2232

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

1724

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

ret = nanosleep(&sleeptime, NULL);

1726

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

1727

perror_plus("nanosleep");

1728

}

1729

}

1730

if(not take_down_interface){

1731

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

1732

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

1733

if(ret == -1){

1734

perror_plus("close");

1735

}

1736

}

1737

#ifdef __linux__

1738

if(restore_loglevel){

1739

/* Restores kernel loglevel to default */

1740

ret = klogctl(7, NULL, 0);

1741

if(ret == -1){

1742

perror_plus("klogctl");

1743

}

1744

}

1745

#endif /* __linux__ */

1746

/* Lower privileges */

1747

errno = 0;

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

1754

} else {

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

1759

}

1760

}

2233

1761

}

2234

1762

2235

1763

if(quit_now){

2236

1764

goto end;

2237

1765

}

2238

1766

2239

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

1767

ret = init_gnutls_global(pubkey, seckey);

2240

1768

if(ret == -1){

2241

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

1769

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

2242

1770

exitcode = EX_UNAVAILABLE;

2243

1771

goto end;

2244

1772

} else {

2259

1787

goto end;

2260

1788

}

2261

1789

2262

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

2263

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

1790

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

1791

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

2264

1792

exitcode = EX_UNAVAILABLE;

2265

1793

goto end;

2266

1794

} else {

2275

1803

/* Connect directly, do not use Zeroconf */

2276

1804

/* (Mainly meant for debugging) */

2277

1805

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

2278

2279

1806

if(address == NULL){

2280

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

1807

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

2281

1808

exitcode = EX_USAGE;

2282

1809

goto end;

2283

1810

}

2286

1813

goto end;

2287

1814

}

2288

1815

2289

in_port_t port;

1816

uint16_t port;

2290

1817

errno = 0;

2291

1818

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

2292

1819

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

2293

or tmpmax != (in_port_t)tmpmax){

2294

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

1820

or tmpmax != (uint16_t)tmpmax){

1821

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

2295

1822

exitcode = EX_USAGE;

2296

1823

goto end;

2297

1824

}

2298

1825

2299

1826

if(quit_now){

2300

1827

goto end;

2301

1828

}

2302

1829

2303

port = (in_port_t)tmpmax;

1830

port = (uint16_t)tmpmax;

2304

1831

*address = '\0';

1832

address = connect_to;

2305

1833

/* Colon in address indicates IPv6 */

2306

1834

int af;

2307

if(strchr(connect_to, ':') != NULL){

1835

if(strchr(address, ':') != NULL){

2308

1836

af = AF_INET6;

2309

/* Accept [] around IPv6 address - see RFC 5952 */

2310

if(connect_to[0] == '[' and address[-1] == ']')

2311

{

2312

connect_to++;

2313

address[-1] = '\0';

2314

}

2315

1837

} else {

2316

1838

af = AF_INET;

2317

1839

}

2318

address = connect_to;

2319

1840

2320

1841

if(quit_now){

2321

1842

goto end;

2322

1843

}

2323

1844

2324

1845

while(not quit_now){

2325

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

2326

&mc);

1846

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

2327

1847

if(quit_now or ret == 0){

2328

1848

break;

2329

1849

}

2330

if(debug){

2331

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

2332

(int)retry_interval);

2333

}

2334

sleep((int)retry_interval);

2335

}

2336

1850

sleep((int)retry_interval or 1);

1851

};

1852

2337

1853

if (not quit_now){

2338

1854

exitcode = EXIT_SUCCESS;

2339

1855

}

2340

1856

2341

1857

goto end;

2342

1858

}

2343

1859

2355

1871

config.publish_domain = 0;

2356

1872

2357

1873

/* Allocate a new server */

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

1874

mc.server = avahi_server_new(avahi_simple_poll_get

1875

(mc.simple_poll), &config, NULL,

1876

NULL, &error);

2360

1877

2361

1878

/* Free the Avahi configuration data */

2362

1879

avahi_server_config_free(&config);

2364

1881

2365

1882

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

2366

1883

if(mc.server == NULL){

2367

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

2368

avahi_strerror(ret_errno));

1884

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

1885

avahi_strerror(error));

2369

1886

exitcode = EX_UNAVAILABLE;

2370

1887

goto end;

2371

1888

}

2377

1894

/* Create the Avahi service browser */

2378

1895

sb = avahi_s_service_browser_new(mc.server, if_index,

2379

1896

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2380

NULL, 0, browse_callback,

2381

(void *)&mc);

1897

NULL, 0, browse_callback, NULL);

2382

1898

if(sb == NULL){

2383

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

2384

avahi_strerror(avahi_server_errno(mc.server)));

1899

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

1900

avahi_strerror(avahi_server_errno(mc.server)));

2385

1901

exitcode = EX_UNAVAILABLE;

2386

1902

goto end;

2387

1903

}

2393

1909

/* Run the main loop */

2394

1910

2395

1911

if(debug){

2396

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

1912

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

2397

1913

}

2398

1914

2399

ret = avahi_loop_with_timeout(simple_poll,

2400

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

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

1916

(int)(retry_interval * 1000));

2401

1917

if(debug){

2402

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

2403

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

1918

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

1919

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

2404

1920

}

2405

1921

2406

1922

end:

2407

1923

2408

1924

if(debug){

2409

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

1925

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

2410

1926

}

2411

1927

2412

1928

/* Cleanup things */

2413

free(mc.interfaces);

2414

2415

1929

if(sb != NULL)

2416

1930

avahi_s_service_browser_free(sb);

2417

1931

2418

1932

if(mc.server != NULL)

2419

1933

avahi_server_free(mc.server);

2420

1934

2421

if(simple_poll != NULL)

2422

avahi_simple_poll_free(simple_poll);

1935

if(mc.simple_poll != NULL)

1936

avahi_simple_poll_free(mc.simple_poll);

2423

1937

2424

1938

if(gnutls_initialized){

2425

1939

gnutls_certificate_free_credentials(mc.cred);

2430

1944

if(gpgme_initialized){

2431

1945

gpgme_release(mc.ctx);

2432

1946

}

2433

1947

2434

1948

/* Cleans up the circular linked list of Mandos servers the client

2435

1949

has seen */

2436

1950

if(mc.current_server != NULL){

2442

1956

}

2443

1957

}

2444

1958

2445

/* Re-raise priviliges */

2446

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

1959

/* Take down the network interface */

1960

if(take_down_interface){

1961

/* Re-raise priviliges */

1962

errno = 0;

1963

ret = seteuid(0);

1964

if(ret == -1){

1965

perror_plus("seteuid");

1966

}

1967

if(geteuid() == 0){

1968

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

1969

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1971

} else if(network.ifr_flags & IFF_UP) {

1972

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

1973

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

1974

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2463

1976

}

2464

1977

}

2465

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

2466

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

2467

" down\n");

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

2468

1987

}

2469

1988

}

2470

2471

lower_privileges_permanently();

2472

1989

}

2473

1990

2474

free(interfaces_to_take_down);

2475

free(interfaces_hooks);

2476

2477

1991

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

2478

1992

if(tempdir_created){

2479

1993

struct dirent **direntries = NULL;

2480

1994

struct dirent *direntry = NULL;

2481

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

2482

alphasort);

2483

if (numentries > 0){

2484

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

1995

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1996

if (ret > 0){

1997

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

2485

1998

direntry = direntries[i];

2486

1999

char *fullname = NULL;

2487

2000

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

2492

2005

}

2493

2006

ret = remove(fullname);

2494

2007

if(ret == -1){

2495

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

2496

strerror(errno));

2008

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

2009

strerror(errno));

2497

2010

}

2498

2011

free(fullname);

2499

2012

}

2500

2013

}

2501

2014

2502

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

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2503

2017

free(direntries);

2504

if (numentries == -1){

2018

if (ret == -1){

2505

2019

perror_plus("scandir");

2506

2020

}

2507

2021

ret = rmdir(tempdir);