/mandos/trunk : revision 24.1.186

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

10

*

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* Everything else is

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*

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

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

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* along with this program. If not, see

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

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*

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

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

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*/

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32

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

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

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stdout, ferror(), remove() */

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

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

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

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

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strtof(), abort() */

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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

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

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

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inet_pton(), connect() */

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

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*/

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

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strtoimax() */

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

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65

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

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program_invocation_short_name */

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

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*/

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

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

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

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setgid(), pause() */

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

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78

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

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

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raise() */

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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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

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WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

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88

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#ifdef __linux__

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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 */

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/* 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;

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

130

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

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131

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

139

132

char *connect_to = NULL;

140

const char *hookdir = HOOKDIR;

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uid_t uid = 65534;

142

gid_t gid = 65534;

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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;

175

165

176

166

/* Function to use when printing errors */

177

167

void perror_plus(const char *print_text){

178

int e = errno;

179

168

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

180

169

program_invocation_short_name);

181

errno = e;

182

170

perror(print_text);

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171

}

184

172

185

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

186

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

187

va_list ap;

188

va_start (ap, format);

189

190

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

191

program_invocation_short_name));

192

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

193

}

194

195

173

/*

196

174

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

197

175

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

198

176

* "buffer_length" is how much is already used.

199

177

*/

200

178

size_t incbuffer(char **buffer, size_t buffer_length,

201

size_t buffer_capacity){

179

size_t buffer_capacity){

202

180

if(buffer_length + BUFFER_SIZE > buffer_capacity){

203

181

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

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182

if(buffer == NULL){

210

188

}

211

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190

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

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

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int af){

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

193

int af){

215

194

int ret;

216

195

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

217

196

if(new_server == NULL){

218

197

perror_plus("malloc");

219

return false;

198

return -1;

220

199

}

221

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

222

.port = port,

223

.if_index = if_index,

224

.af = af };

201

.port = port,

202

.if_index = if_index,

203

.af = af };

225

204

if(new_server->ip == NULL){

226

205

perror_plus("strdup");

227

return false;

206

return -1;

228

207

}

229

208

/* Special case of first server */

230

209

if (mc.current_server == NULL){

241

220

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

242

221

if(ret == -1){

243

222

perror_plus("clock_gettime");

244

return false;

223

return -1;

245

224

}

246

return true;

225

return 0;

247

226

}

248

227

249

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/*

250

229

* Initialize GPGME.

251

230

*/

252

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

253

const char *tempdir){

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

254

233

gpgme_error_t rc;

255

234

gpgme_engine_info_t engine_info;

256

235

271

250

272

251

rc = gpgme_data_new_from_fd(&pgp_data, fd);

273

252

if(rc != GPG_ERR_NO_ERROR){

274

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

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gpgme_strsource(rc), gpgme_strerror(rc));

253

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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255

return false;

277

256

}

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279

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rc = gpgme_op_import(mc.ctx, pgp_data);

280

259

if(rc != GPG_ERR_NO_ERROR){

281

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

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gpgme_strsource(rc), gpgme_strerror(rc));

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

283

262

return false;

284

263

}

285

264

292

271

}

293

272

294

273

if(debug){

295

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

274

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

296

275

}

297

276

298

277

/* Init GPGME */

299

278

gpgme_check_version(NULL);

300

279

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

301

280

if(rc != GPG_ERR_NO_ERROR){

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

281

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

282

gpgme_strsource(rc), gpgme_strerror(rc));

304

283

return false;

305

284

}

306

285

307

286

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

308

287

rc = gpgme_get_engine_info(&engine_info);

309

288

if(rc != GPG_ERR_NO_ERROR){

310

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

311

gpgme_strsource(rc), gpgme_strerror(rc));

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

312

291

return false;

313

292

}

314

293

while(engine_info != NULL){

320

299

engine_info = engine_info->next;

321

300

}

322

301

if(engine_info == NULL){

323

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

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tempdir);

302

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

325

303

return false;

326

304

}

327

305

328

306

/* Create new GPGME "context" */

329

307

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

330

308

if(rc != GPG_ERR_NO_ERROR){

331

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

332

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

333

gpgme_strerror(rc));

309

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

310

gpgme_strsource(rc), gpgme_strerror(rc));

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311

return false;

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312

}

336

313

355

332

ssize_t plaintext_length = 0;

356

333

357

334

if(debug){

358

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

335

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

359

336

}

360

337

361

338

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

362

339

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

363

340

0);

364

341

if(rc != GPG_ERR_NO_ERROR){

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

342

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

343

gpgme_strsource(rc), gpgme_strerror(rc));

367

344

return -1;

368

345

}

369

346

370

347

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

371

348

rc = gpgme_data_new(&dh_plain);

372

349

if(rc != GPG_ERR_NO_ERROR){

373

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

374

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

375

gpgme_strsource(rc), gpgme_strerror(rc));

350

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

351

gpgme_strsource(rc), gpgme_strerror(rc));

376

352

gpgme_data_release(dh_crypto);

377

353

return -1;

378

354

}

381

357

data buffer */

382

358

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

383

359

if(rc != GPG_ERR_NO_ERROR){

384

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

385

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

386

362

plaintext_length = -1;

387

363

if(debug){

388

364

gpgme_decrypt_result_t result;

389

365

result = gpgme_op_decrypt_result(mc.ctx);

390

366

if(result == NULL){

391

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

367

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

392

368

} else {

393

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

394

result->unsupported_algorithm);

395

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

396

result->wrong_key_usage);

369

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

370

result->unsupported_algorithm);

371

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

372

result->wrong_key_usage);

397

373

if(result->file_name != NULL){

398

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

374

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

399

375

}

400

376

gpgme_recipient_t recipient;

401

377

recipient = result->recipients;

402

378

while(recipient != NULL){

403

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

404

gpgme_pubkey_algo_name

405

(recipient->pubkey_algo));

406

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

407

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

408

recipient->status == GPG_ERR_NO_SECKEY

409

? "No" : "Yes");

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

410

385

recipient = recipient->next;

411

386

}

412

387

}

415

390

}

416

391

417

392

if(debug){

418

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

393

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

419

394

}

420

395

421

396

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

428

403

*plaintext = NULL;

429

404

while(true){

430

405

plaintext_capacity = incbuffer(plaintext,

431

(size_t)plaintext_length,

432

plaintext_capacity);

406

(size_t)plaintext_length,

407

plaintext_capacity);

433

408

if(plaintext_capacity == 0){

434

perror_plus("incbuffer");

435

plaintext_length = -1;

436

goto decrypt_end;

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

437

412

}

438

413

439

414

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

452

427

}

453

428

454

429

if(debug){

455

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

430

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

456

431

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

457

432

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

458

433

}

470

445

}

471

446

472

447

static const char * safer_gnutls_strerror(int value){

473

const char *ret = gnutls_strerror(value);

448

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

449

-Wunreachable-code */

474

450

if(ret == NULL)

475

451

ret = "(unknown)";

476

452

return ret;

479

455

/* GnuTLS log function callback */

480

456

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

481

457

const char* string){

482

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

458

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

483

459

}

484

460

485

461

static int init_gnutls_global(const char *pubkeyfilename,

487

463

int ret;

488

464

489

465

if(debug){

490

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

466

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

491

467

}

492

468

493

469

ret = gnutls_global_init();

494

470

if(ret != GNUTLS_E_SUCCESS){

495

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

496

safer_gnutls_strerror(ret));

471

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

472

safer_gnutls_strerror(ret));

497

473

return -1;

498

474

}

499

475

508

484

/* OpenPGP credentials */

509

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

510

486

if(ret != GNUTLS_E_SUCCESS){

511

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

512

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

513

489

gnutls_global_deinit();

514

490

return -1;

515

491

}

516

492

517

493

if(debug){

518

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

519

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

520

pubkeyfilename,

521

seckeyfilename);

494

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

495

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

496

seckeyfilename);

522

497

}

523

498

524

499

ret = gnutls_certificate_set_openpgp_key_file

525

500

(mc.cred, pubkeyfilename, seckeyfilename,

526

501

GNUTLS_OPENPGP_FMT_BASE64);

527

502

if(ret != GNUTLS_E_SUCCESS){

528

fprintf_plus(stderr,

529

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

530

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

531

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

532

safer_gnutls_strerror(ret));

503

fprintf(stderr,

504

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

505

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

506

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

507

safer_gnutls_strerror(ret));

533

508

goto globalfail;

534

509

}

535

510

536

511

/* GnuTLS server initialization */

537

512

ret = gnutls_dh_params_init(&mc.dh_params);

538

513

if(ret != GNUTLS_E_SUCCESS){

539

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

540

" initialization: %s\n",

541

safer_gnutls_strerror(ret));

514

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

515

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

542

516

goto globalfail;

543

517

}

544

518

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

545

519

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

520

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

521

safer_gnutls_strerror(ret));

548

522

goto globalfail;

549

523

}

550

524

570

544

}

571

545

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

572

546

if(ret != GNUTLS_E_SUCCESS){

573

fprintf_plus(stderr,

574

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

575

safer_gnutls_strerror(ret));

547

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

548

safer_gnutls_strerror(ret));

576

549

}

577

550

578

551

{

585

558

}

586

559

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

587

560

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));

561

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

562

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

563

safer_gnutls_strerror(ret));

591

564

gnutls_deinit(*session);

592

565

return -1;

593

566

}

602

575

}

603

576

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

604

577

if(ret != GNUTLS_E_SUCCESS){

605

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

606

safer_gnutls_strerror(ret));

578

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

579

safer_gnutls_strerror(ret));

607

580

gnutls_deinit(*session);

608

581

return -1;

609

582

}

621

594

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

622

595

623

596

/* Called when a Mandos server is found */

624

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

597

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

625

598

AvahiIfIndex if_index,

626

599

int af){

627

600

int ret, tcp_sd = -1;

654

627

pf = PF_INET;

655

628

break;

656

629

default:

657

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

630

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

658

631

errno = EINVAL;

659

632

return -1;

660

633

}

665

638

}

666

639

667

640

if(debug){

668

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

669

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

641

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

642

"\n", ip, port);

670

643

}

671

644

672

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

698

671

}

699

672

if(ret == 0){

700

673

int e = errno;

701

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

674

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

702

675

errno = e;

703

676

goto mandos_end;

704

677

}

705

678

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

679

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

680

-Wconversion and

681

-Wunreachable-code */

682

707

683

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

684

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

709

-Wunreachable-code*/

685

-Wunreachable-code*/

710

686

if(if_index == AVAHI_IF_UNSPEC){

711

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

712

" incomplete without a network interface\n");

687

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

688

" without a network interface\n");

713

689

errno = EINVAL;

714

690

goto mandos_end;

715

691

}

733

709

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

734

710

perror_plus("if_indextoname");

735

711

} else {

736

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

737

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

712

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

713

ip, interface, port);

738

714

}

739

715

} else {

740

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

741

ip, (uintmax_t)port);

716

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

717

port);

742

718

}

743

719

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

720

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

754

730

perror_plus("inet_ntop");

755

731

} else {

756

732

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

757

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

733

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

758

734

}

759

735

}

760

736

}

788

764

while(true){

789

765

size_t out_size = strlen(out);

790

766

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

791

out_size - written));

767

out_size - written));

792

768

if(ret == -1){

793

769

int e = errno;

794

770

perror_plus("write");

814

790

}

815

791

816

792

if(debug){

817

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

793

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

818

794

}

819

795

820

796

if(quit_now){

822

798

goto mandos_end;

823

799

}

824

800

825

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

826

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

827

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

828

gnutls_transport_set_ptr(session,

829

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

801

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

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

830

803

831

804

if(quit_now){

832

805

errno = EINTR;

843

816

844

817

if(ret != GNUTLS_E_SUCCESS){

845

818

if(debug){

846

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

819

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

847

820

gnutls_perror(ret);

848

821

}

849

822

errno = EPROTO;

853

826

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

854

827

855

828

if(debug){

856

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

857

" %s\n", ip);

829

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

830

ip);

858

831

}

859

832

860

833

while(true){

865

838

}

866

839

867

840

buffer_capacity = incbuffer(&buffer, buffer_length,

868

buffer_capacity);

841

buffer_capacity);

869

842

if(buffer_capacity == 0){

870

843

int e = errno;

871

844

perror_plus("incbuffer");

898

871

}

899

872

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

900

873

if(ret < 0){

901

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

902

"***\n");

874

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

903

875

gnutls_perror(ret);

904

876

errno = EPROTO;

905

877

goto mandos_end;

906

878

}

907

879

break;

908

880

default:

909

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

910

" encrypted session with Mandos server\n");

881

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

882

" encrypted session with Mandos server\n");

911

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

912

884

errno = EIO;

913

885

goto mandos_end;

918

890

}

919

891

920

892

if(debug){

921

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

893

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

922

894

}

923

895

924

896

if(quit_now){

936

908

937

909

if(buffer_length > 0){

938

910

ssize_t decrypted_buffer_size;

939

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

940

913

&decrypted_buffer);

941

914

if(decrypted_buffer_size >= 0){

942

915

953

926

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

954

927

int e = errno;

955

928

if(debug){

956

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

957

strerror(errno));

929

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

930

strerror(errno));

958

931

}

959

932

errno = e;

960

933

goto mandos_end;

1005

978

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

979

flags,

1007

980

AVAHI_GCC_UNUSED void* userdata){

1008

if(r == NULL){

1009

return;

1010

}

981

assert(r);

1011

982

1012

983

/* Called whenever a service has been resolved successfully or

1013

984

timed out */

1019

990

switch(event){

1020

991

default:

1021

992

case AVAHI_RESOLVER_FAILURE:

1022

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

1023

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

1024

domain,

1025

avahi_strerror(avahi_server_errno(mc.server)));

993

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

994

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

995

avahi_strerror(avahi_server_errno(mc.server)));

1026

996

break;

1027

997

1028

998

case AVAHI_RESOLVER_FOUND:

1030

1000

char ip[AVAHI_ADDRESS_STR_MAX];

1031

1001

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

1032

1002

if(debug){

1033

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

1034

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

1035

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

1003

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

1004

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

1005

ip, (intmax_t)interface, port);

1036

1006

}

1037

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

1038

interface,

1007

int ret = start_mandos_communication(ip, port, interface,

1039

1008

avahi_proto_to_af(proto));

1040

1009

if(ret == 0){

1041

1010

avahi_simple_poll_quit(mc.simple_poll);

1042

1011

} else {

1043

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

1044

avahi_proto_to_af(proto))){

1045

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

1046

" list\n", name);

1047

}

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1048

1014

}

1049

1015

}

1050

1016

}

1061

1027

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1028

flags,

1063

1029

AVAHI_GCC_UNUSED void* userdata){

1064

if(b == NULL){

1065

return;

1066

}

1030

assert(b);

1067

1031

1068

1032

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

1069

1033

is removed from the LAN */

1076

1040

default:

1077

1041

case AVAHI_BROWSER_FAILURE:

1078

1042

1079

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1081

1045

avahi_simple_poll_quit(mc.simple_poll);

1082

1046

return;

1083

1047

1090

1054

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

1091

1055

name, type, domain, protocol, 0,

1092

1056

resolve_callback, NULL) == NULL)

1093

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

1094

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1057

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

1058

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

1096

1059

break;

1097

1060

1098

1061

case AVAHI_BROWSER_REMOVE:

1101

1064

case AVAHI_BROWSER_ALL_FOR_NOW:

1102

1065

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1103

1066

if(debug){

1104

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

1105

" searching...\n");

1067

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

1106

1068

}

1107

1069

break;

1108

1070

}

1123

1085

errno = old_errno;

1124

1086

}

1125

1087

1126

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

1127

int ret;

1128

error_t ret_errno;

1129

1130

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

1131

if(s < 0){

1132

ret_errno = errno;

1133

perror_plus("socket");

1134

errno = ret_errno;

1135

return false;

1136

}

1137

strcpy(ifr->ifr_name, ifname);

1138

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1139

if(ret == -1){

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1140

1144

if(debug){

1141

ret_errno = errno;

1142

perror_plus("ioctl SIOCGIFFLAGS");

1143

errno = ret_errno;

1145

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

1146

flagstring, if_entry->d_name);

1144

1147

}

1145

return false;

1148

free(flagstring);

1149

return 0;

1146

1150

}

1147

return true;

1148

}

1149

1150

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

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

1153

/* Reject the loopback device */

1153

if(ifr->ifr_flags & IFF_LOOPBACK){

1154

if(flags & IFF_LOOPBACK){

1154

1155

if(debug){

1155

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

1156

ifname);

1156

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

1157

if_entry->d_name);

1157

1158

}

1158

return false;

1159

return 0;

1159

1160

}

1160

1161

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

1161

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

1162

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

1162

1163

if(debug){

1163

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

1164

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

1164

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

1165

if_entry->d_name);

1165

1166

}

1166

return true;

1167

return 1;

1167

1168

}

1168

1169

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

1169

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

1170

if(not (flags & IFF_BROADCAST)){

1170

1171

if(debug){

1171

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1172

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

1172

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

1173

if_entry->d_name);

1173

1174

}

1174

return false;

1175

return 0;

1175

1176

}

1176

1177

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

1177

if(ifr->ifr_flags & IFF_NOARP){

1178

if(flags & IFF_NOARP){

1178

1179

if(debug){

1179

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

1180

ifname);

1180

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

1181

if_entry->d_name);

1181

1182

}

1182

return false;

1183

return 0;

1183

1184

}

1184

1185

/* Accept this device */

1186

if(debug){

1187

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

1188

}

1189

return true;

1190

}

1191

1192

/*

1193

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

1194

* corresponds to an acceptable network device.

1195

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

1196

*/

1197

int good_interface(const struct dirent *if_entry){

1198

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

1199

return 0;

1200

}

1201

1202

struct ifreq ifr;

1203

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

1204

if(debug){

1205

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

1206

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

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1187

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

1188

if_entry->d_name);

1213

1189

}

1214

1190

return 1;

1215

1191

}

1216

1192

1217

/*

1218

* This function determines if a network interface is up.

1219

*/

1220

bool interface_is_up(const char *interface){

1221

struct ifreq ifr;

1222

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

1223

if(debug){

1224

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

1225

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

1226

}

1227

return false;

1228

}

1229

1230

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

1231

}

1232

1233

/*

1234

* This function determines if a network interface is running

1235

*/

1236

bool interface_is_running(const char *interface){

1237

struct ifreq ifr;

1238

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

1239

if(debug){

1240

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

1241

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

1242

}

1243

return false;

1244

}

1245

1246

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

1247

}

1248

1249

1193

int notdotentries(const struct dirent *direntry){

1250

1194

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

1251

1195

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

1257

1201

return 1;

1258

1202

}

1259

1203

1260

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

1261

int runnable_hook(const struct dirent *direntry){

1262

int ret;

1263

size_t sret;

1264

struct stat st;

1265

1266

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

1267

/* Empty name? */

1268

return 0;

1269

}

1270

1271

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

1272

"abcdefghijklmnopqrstuvwxyz"

1273

"0123456789"

1274

"_-");

1275

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

1276

/* Contains non-allowed characters */

1277

if(debug){

1278

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

1279

direntry->d_name);

1280

}

1281

return 0;

1282

}

1283

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1292

if(ret == -1){

1293

if(debug){

1294

perror_plus("Could not stat hook");

1295

}

1296

return 0;

1297

}

1298

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

1299

/* Not a regular file */

1300

if(debug){

1301

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

1302

direntry->d_name);

1303

}

1304

return 0;

1305

}

1306

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

1307

/* Not executable */

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

return 0;

1313

}

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1318

return 1;

1319

}

1320

1321

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1322

1205

int ret;

1323

1206

struct timespec now;

1327

1210

while(true){

1328

1211

if(mc.current_server == NULL){

1329

1212

if (debug){

1330

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

1331

" No timeout!\n");

1213

fprintf(stderr,

1214

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

1332

1215

}

1333

1216

ret = avahi_simple_poll_iterate(s, -1);

1334

1217

} else {

1335

1218

if (debug){

1336

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

1337

" it, or wait\n");

1219

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

1220

" or wait\n");

1338

1221

}

1339

1222

/* the current time */

1340

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1356

1239

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

1357

1240

1358

1241

if (debug){

1359

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

1360

block_time);

1242

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

1361

1243

}

1362

1244

1363

1245

if(block_time <= 0){

1383

1265

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

1384

1266

}

1385

1267

if(ret != 0){

1386

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

1268

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

1387

1269

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

1388

1270

}

1389

1271

}

1390

1272

}

1391

1273

}

1392

1274

1393

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

1394

error_t raise_privileges(void){

1395

error_t old_errno = errno;

1396

error_t ret_errno = 0;

1397

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

1398

ret_errno = errno;

1399

perror_plus("seteuid");

1400

}

1401

errno = old_errno;

1402

return ret_errno;

1403

}

1404

1405

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

1406

error_t raise_privileges_permanently(void){

1407

error_t old_errno = errno;

1408

error_t ret_errno = raise_privileges();

1409

if(ret_errno != 0){

1410

errno = old_errno;

1411

return ret_errno;

1412

}

1413

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

1414

ret_errno = errno;

1415

perror_plus("seteuid");

1416

}

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

1421

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

1422

error_t lower_privileges(void){

1423

error_t old_errno = errno;

1424

error_t ret_errno = 0;

1425

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

1426

ret_errno = errno;

1427

perror_plus("seteuid");

1428

}

1429

errno = old_errno;

1430

return ret_errno;

1431

}

1432

1433

/* Lower privileges permanently */

1434

error_t lower_privileges_permanently(void){

1435

error_t old_errno = errno;

1436

error_t ret_errno = 0;

1437

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

1438

ret_errno = errno;

1439

perror_plus("setuid");

1440

}

1441

errno = old_errno;

1442

return ret_errno;

1443

}

1444

1445

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

1446

const float delay){

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1452

if(numhooks == -1){

1453

if(errno == ENOENT){

1454

if(debug){

1455

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

1456

" found\n", hookdir);

1457

}

1458

} else {

1459

perror_plus("scandir");

1460

}

1461

} else {

1462

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

1463

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

1464

direntry = direntries[i];

1465

char *fullname = NULL;

1466

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

1467

if(ret < 0){

1468

perror_plus("asprintf");

1469

continue;

1470

}

1471

if(debug){

1472

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

1473

direntry->d_name);

1474

}

1475

pid_t hook_pid = fork();

1476

if(hook_pid == 0){

1477

/* Child */

1478

/* Raise privileges */

1479

raise_privileges_permanently();

1480

/* Set group */

1481

errno = 0;

1482

ret = setgid(0);

1483

if(ret == -1){

1484

perror_plus("setgid");

1485

}

1486

/* Reset supplementary groups */

1487

errno = 0;

1488

ret = setgroups(0, NULL);

1489

if(ret == -1){

1490

perror_plus("setgroups");

1491

}

1492

dup2(devnull, STDIN_FILENO);

1493

close(devnull);

1494

dup2(STDERR_FILENO, STDOUT_FILENO);

1495

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

1496

if(ret == -1){

1497

perror_plus("setenv");

1498

_exit(EX_OSERR);

1499

}

1500

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

1501

if(ret == -1){

1502

perror_plus("setenv");

1503

_exit(EX_OSERR);

1504

}

1505

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

1506

if(ret == -1){

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

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

1511

if(ret == -1){

1512

perror_plus("setenv");

1513

_exit(EX_OSERR);

1514

}

1515

char *delaystring;

1516

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

1517

if(ret == -1){

1518

perror_plus("asprintf");

1519

_exit(EX_OSERR);

1520

}

1521

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

1522

if(ret == -1){

1523

free(delaystring);

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

free(delaystring);

1528

if(connect_to != NULL){

1529

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

1530

if(ret == -1){

1531

perror_plus("setenv");

1532

_exit(EX_OSERR);

1533

}

1534

}

1535

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

1536

perror_plus("execl");

1537

_exit(EXIT_FAILURE);

1538

}

1539

} else {

1540

int status;

1541

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

1542

perror_plus("waitpid");

1543

free(fullname);

1544

continue;

1545

}

1546

if(WIFEXITED(status)){

1547

if(WEXITSTATUS(status) != 0){

1548

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

1549

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

1550

WEXITSTATUS(status));

1551

free(fullname);

1552

continue;

1553

}

1554

} else if(WIFSIGNALED(status)){

1555

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

1556

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

1557

WTERMSIG(status));

1558

free(fullname);

1559

continue;

1560

} else {

1561

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

1562

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

1563

free(fullname);

1564

continue;

1565

}

1566

}

1567

free(fullname);

1568

if(debug){

1569

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

1570

direntry->d_name);

1571

}

1572

}

1573

close(devnull);

1574

}

1575

return true;

1576

}

1577

1578

error_t bring_up_interface(const char *const interface,

1579

const float delay){

1580

int sd = -1;

1581

error_t old_errno = errno;

1582

error_t ret_errno = 0;

1583

int ret, ret_setflags;

1584

struct ifreq network;

1585

unsigned int if_index = if_nametoindex(interface);

1586

if(if_index == 0){

1587

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

1588

errno = old_errno;

1589

return ENXIO;

1590

}

1591

1592

if(quit_now){

1593

errno = old_errno;

1594

return EINTR;

1595

}

1596

1597

if(not interface_is_up(interface)){

1598

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

1599

ret_errno = errno;

1600

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

1601

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

1602

return ret_errno;

1603

}

1604

network.ifr_flags |= IFF_UP;

1605

1606

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1607

if(sd < 0){

1608

ret_errno = errno;

1609

perror_plus("socket");

1610

errno = old_errno;

1611

return ret_errno;

1612

}

1613

1614

if(quit_now){

1615

close(sd);

1616

errno = old_errno;

1617

return EINTR;

1618

}

1619

1620

if(debug){

1621

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

1622

interface);

1623

}

1624

1625

/* Raise priviliges */

1626

raise_privileges();

1627

1628

#ifdef __linux__

1629

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1630

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

1631

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

1632

bool restore_loglevel = true;

1633

if(ret_linux == -1){

1634

restore_loglevel = false;

1635

perror_plus("klogctl");

1636

}

1637

#endif /* __linux__ */

1638

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

1639

ret_errno = errno;

1640

#ifdef __linux__

1641

if(restore_loglevel){

1642

ret_linux = klogctl(7, NULL, 0);

1643

if(ret_linux == -1){

1644

perror_plus("klogctl");

1645

}

1646

}

1647

#endif /* __linux__ */

1648

1649

/* Lower privileges */

1650

lower_privileges();

1651

1652

/* Close the socket */

1653

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

1654

if(ret == -1){

1655

perror_plus("close");

1656

}

1657

1658

if(ret_setflags == -1){

1659

errno = ret_errno;

1660

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1661

errno = old_errno;

1662

return ret_errno;

1663

}

1664

} else if(debug){

1665

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

1666

interface);

1667

}

1668

1669

/* Sleep checking until interface is running.

1670

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

1671

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

1672

if(interface_is_running(interface)){

1673

break;

1674

}

1675

struct timespec sleeptime = { .tv_nsec = 250000000 };

1676

ret = nanosleep(&sleeptime, NULL);

1677

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

1678

perror_plus("nanosleep");

1679

}

1680

}

1681

1682

errno = old_errno;

1683

return 0;

1684

}

1685

1686

error_t take_down_interface(const char *const interface){

1687

int sd = -1;

1688

error_t old_errno = errno;

1689

error_t ret_errno = 0;

1690

int ret, ret_setflags;

1691

struct ifreq network;

1692

unsigned int if_index = if_nametoindex(interface);

1693

if(if_index == 0){

1694

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

1695

errno = old_errno;

1696

return ENXIO;

1697

}

1698

if(interface_is_up(interface)){

1699

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

1700

ret_errno = errno;

1701

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

1702

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

1703

return ret_errno;

1704

}

1705

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

1706

1707

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1708

if(sd < 0){

1709

ret_errno = errno;

1710

perror_plus("socket");

1711

errno = old_errno;

1712

return ret_errno;

1713

}

1714

1715

if(debug){

1716

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

1717

interface);

1718

}

1719

1720

/* Raise priviliges */

1721

raise_privileges();

1722

1723

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

1724

ret_errno = errno;

1725

1726

/* Lower privileges */

1727

lower_privileges();

1728

1729

/* Close the socket */

1730

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

1731

if(ret == -1){

1732

perror_plus("close");

1733

}

1734

1735

if(ret_setflags == -1){

1736

errno = ret_errno;

1737

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

errno = old_errno;

1739

return ret_errno;

1740

}

1741

} else if(debug){

1742

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

1743

interface);

1744

}

1745

1746

errno = old_errno;

1747

return 0;

1748

}

1749

1750

1275

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

1751

1276

AvahiSServiceBrowser *sb = NULL;

1752

error_t ret_errno;

1277

int error;

1753

1278

int ret;

1754

1279

intmax_t tmpmax;

1755

1280

char *tmp;

1756

1281

int exitcode = EXIT_SUCCESS;

1757

char *interfaces = NULL;

1758

size_t interfaces_size = 0;

1759

char *interfaces_to_take_down = NULL;

1760

size_t interfaces_to_take_down_size = 0;

1282

const char *interface = "";

1283

struct ifreq network;

1284

int sd = -1;

1285

bool take_down_interface = false;

1286

uid_t uid;

1287

gid_t gid;

1761

1288

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

1762

1289

bool tempdir_created = false;

1763

1290

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1764

1291

const char *seckey = PATHDIR "/" SECKEY;

1765

1292

const char *pubkey = PATHDIR "/" PUBKEY;

1766

char *interfaces_hooks = NULL;

1767

size_t interfaces_hooks_size = 0;

1768

1293

1769

1294

bool gnutls_initialized = false;

1770

1295

bool gpgme_initialized = false;

1832

1357

.group = 2 },

1833

1358

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

1834

1359

.arg = "SECONDS",

1835

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

1836

.group = 2 },

1837

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

1838

.arg = "DIR",

1839

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

1360

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

1840

1361

.group = 2 },

1841

1362

/*

1842

1363

* These reproduce what we would get without ARGP_NO_HELP

1861

1382

connect_to = arg;

1862

1383

break;

1863

1384

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

1864

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

1865

(int)',');

1866

if(ret_errno != 0){

1867

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

1868

}

1385

interface = arg;

1869

1386

break;

1870

1387

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

1871

1388

seckey = arg;

1900

1417

argp_error(state, "Bad retry interval");

1901

1418

}

1902

1419

break;

1903

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

1904

hookdir = arg;

1905

break;

1906

1420

/*

1907

1421

* These reproduce what we would get without ARGP_NO_HELP

1908

1422

*/

1914

1428

argp_state_help(state, state->out_stream,

1915

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1916

1430

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

1917

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

1431

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

1918

1432

exit(argp_err_exit_status);

1919

1433

break;

1920

1434

default:

1947

1461

{

1948

1462

/* Work around Debian bug #633582:

1949

1463

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

1464

struct stat st;

1950

1465

1951

1466

/* Re-raise priviliges */

1952

if(raise_privileges() == 0){

1953

struct stat st;

1954

1955

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

1956

int seckey_fd = open(seckey, O_RDONLY);

1957

if(seckey_fd == -1){

1958

perror_plus("open");

1959

} else {

1960

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

1961

if(ret == -1){

1962

perror_plus("fstat");

1963

} else {

1964

if(S_ISREG(st.st_mode)

1965

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

1966

ret = fchown(seckey_fd, uid, gid);

1967

if(ret == -1){

1968

perror_plus("fchown");

1969

}

1970

}

1971

}

1972

TEMP_FAILURE_RETRY(close(seckey_fd));

1973

}

1974

}

1975

1976

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

1977

int pubkey_fd = open(pubkey, O_RDONLY);

1978

if(pubkey_fd == -1){

1979

perror_plus("open");

1980

} else {

1981

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

1982

if(ret == -1){

1983

perror_plus("fstat");

1984

} else {

1985

if(S_ISREG(st.st_mode)

1986

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

1987

ret = fchown(pubkey_fd, uid, gid);

1988

if(ret == -1){

1989

perror_plus("fchown");

1990

}

1991

}

1992

}

1993

TEMP_FAILURE_RETRY(close(pubkey_fd));

1994

}

1995

}

1996

1997

/* Lower privileges */

1998

errno = 0;

1999

ret = seteuid(uid);

2000

if(ret == -1){

2001

perror_plus("seteuid");

2002

}

2003

}

2004

}

2005

2006

/* Remove empty interface names */

2007

{

2008

char *interface = NULL;

2009

while((interface = argz_next(interfaces, interfaces_size,

2010

interface))){

2011

if(if_nametoindex(interface) == 0){

2012

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

2013

fprintf_plus(stderr, "Not using nonexisting interface"

2014

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

2015

}

2016

argz_delete(&interfaces, &interfaces_size, interface);

2017

interface = NULL;

2018

}

2019

}

2020

}

2021

2022

/* Run network hooks */

2023

{

2024

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2025

interfaces, interfaces_size);

2026

if(ret_errno != 0){

2027

errno = ret_errno;

2028

perror_plus("argz_append");

2029

goto end;

2030

}

2031

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

2032

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

2033

goto end;

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

2034

1518

}

2035

1519

}

2036

1520

2037

1521

if(not debug){

2038

1522

avahi_set_log_function(empty_log);

2039

1523

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

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

1532

if(debug){

1533

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

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

2040

1549

2041

1550

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

2042

1551

from the signal handler */

2044

1553

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

2045

1554

mc.simple_poll = avahi_simple_poll_new();

2046

1555

if(mc.simple_poll == NULL){

2047

fprintf_plus(stderr,

2048

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

1556

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

2049

1557

exitcode = EX_UNAVAILABLE;

2050

1558

goto end;

2051

1559

}

2113

1621

}

2114

1622

}

2115

1623

2116

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

2117

if(interfaces == NULL){

2118

struct dirent **direntries;

2119

/* Look for any good interfaces */

2120

ret = scandir(sys_class_net, &direntries, good_interface,

2121

alphasort);

2122

if(ret >= 1){

2123

/* Add all found interfaces to interfaces list */

2124

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

2125

ret_errno = argz_add(&interfaces, &interfaces_size,

2126

direntries[i]->d_name);

2127

if(ret_errno != 0){

2128

perror_plus("argz_add");

2129

continue;

2130

}

2131

if(debug){

2132

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

2133

direntries[i]->d_name);

2134

}

2135

}

2136

free(direntries);

1624

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

1625

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

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

if(if_index == 0){

1628

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

1629

exitcode = EX_UNAVAILABLE;

1630

goto end;

1631

}

1632

1633

if(quit_now){

1634

goto end;

1635

}

1636

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1644

#ifdef __linux__

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1646

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

1647

ret = klogctl(8, NULL, 5);

1648

bool restore_loglevel = true;

1649

if(ret == -1){

1650

restore_loglevel = false;

1651

perror_plus("klogctl");

1652

}

1653

#endif /* __linux__ */

1654

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1656

if(sd < 0){

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1659

#ifdef __linux__

1660

if(restore_loglevel){

1661

ret = klogctl(7, NULL, 0);

1662

if(ret == -1){

1663

perror_plus("klogctl");

1664

}

1665

}

1666

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

goto end;

1674

}

1675

strcpy(network.ifr_name, interface);

1676

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

1677

if(ret == -1){

1678

perror_plus("ioctl SIOCGIFFLAGS");

1679

#ifdef __linux__

1680

if(restore_loglevel){

1681

ret = klogctl(7, NULL, 0);

1682

if(ret == -1){

1683

perror_plus("klogctl");

1684

}

1685

}

1686

#endif /* __linux__ */

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1694

goto end;

1695

}

1696

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

1697

network.ifr_flags |= IFF_UP;

1698

take_down_interface = true;

1699

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

1700

if(ret == -1){

1701

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1704

#ifdef __linux__

1705

if(restore_loglevel){

1706

ret = klogctl(7, NULL, 0);

1707

if(ret == -1){

1708

perror_plus("klogctl");

1709

}

1710

}

1711

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

goto end;

1719

}

1720

}

1721

/* Sleep checking until interface is running.

1722

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

1723

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

1724

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

1725

if(ret == -1){

1726

perror_plus("ioctl SIOCGIFFLAGS");

1727

} else if(network.ifr_flags & IFF_RUNNING){

1728

break;

1729

}

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1731

ret = nanosleep(&sleeptime, NULL);

1732

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

1733

perror_plus("nanosleep");

1734

}

1735

}

1736

if(not take_down_interface){

1737

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

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1742

}

1743

#ifdef __linux__

1744

if(restore_loglevel){

1745

/* Restores kernel loglevel to default */

1746

ret = klogctl(7, NULL, 0);

1747

if(ret == -1){

1748

perror_plus("klogctl");

1749

}

1750

}

1751

#endif /* __linux__ */

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

2137

1760

} else {

2138

free(direntries);

2139

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

2140

exitcode = EXIT_FAILURE;

2141

goto end;

2142

}

2143

}

2144

2145

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

2146

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

2147

if(debug){

2148

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

2149

interfaces);

2150

}

2151

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2152

}

2153

2154

/* Bring up interfaces which are down */

2155

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

2156

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

2157

char *interface = NULL;

2158

while((interface = argz_next(interfaces, interfaces_size,

2159

interface))){

2160

bool interface_was_up = interface_is_up(interface);

2161

ret = bring_up_interface(interface, delay);

2162

if(not interface_was_up){

2163

if(ret != 0){

2164

errno = ret;

2165

perror_plus("Failed to bring up interface");

2166

} else {

2167

ret_errno = argz_add(&interfaces_to_take_down,

2168

&interfaces_to_take_down_size,

2169

interface);

2170

}

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

2171

1765

}

2172

1766

}

2173

free(interfaces);

2174

interfaces = NULL;

2175

interfaces_size = 0;

2176

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

2177

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

2178

}

2179

1767

}

2180

1768

2181

1769

if(quit_now){

2184

1772

2185

1773

ret = init_gnutls_global(pubkey, seckey);

2186

1774

if(ret == -1){

2187

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

1775

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

2188

1776

exitcode = EX_UNAVAILABLE;

2189

1777

goto end;

2190

1778

} else {

2206

1794

}

2207

1795

2208

1796

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

2209

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

1797

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

2210

1798

exitcode = EX_UNAVAILABLE;

2211

1799

goto end;

2212

1800

} else {

2221

1809

/* Connect directly, do not use Zeroconf */

2222

1810

/* (Mainly meant for debugging) */

2223

1811

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

2224

2225

1812

if(address == NULL){

2226

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

1813

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

2227

1814

exitcode = EX_USAGE;

2228

1815

goto end;

2229

1816

}

2232

1819

goto end;

2233

1820

}

2234

1821

2235

in_port_t port;

1822

uint16_t port;

2236

1823

errno = 0;

2237

1824

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

2238

1825

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

2239

or tmpmax != (in_port_t)tmpmax){

2240

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

1826

or tmpmax != (uint16_t)tmpmax){

1827

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

2241

1828

exitcode = EX_USAGE;

2242

1829

goto end;

2243

1830

}

2246

1833

goto end;

2247

1834

}

2248

1835

2249

port = (in_port_t)tmpmax;

1836

port = (uint16_t)tmpmax;

2250

1837

*address = '\0';

2251

1838

/* Colon in address indicates IPv6 */

2252

1839

int af;

2273

1860

break;

2274

1861

}

2275

1862

if(debug){

2276

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

2277

(int)retry_interval);

1863

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

1864

(int)retry_interval);

2278

1865

}

2279

1866

sleep((int)retry_interval);

2280

1867

}

2282

1869

if (not quit_now){

2283

1870

exitcode = EXIT_SUCCESS;

2284

1871

}

2285

1872

2286

1873

goto end;

2287

1874

}

2288

1875

2302

1889

/* Allocate a new server */

2303

1890

mc.server = avahi_server_new(avahi_simple_poll_get

2304

1891

(mc.simple_poll), &config, NULL,

2305

NULL, &ret_errno);

1892

NULL, &error);

2306

1893

2307

1894

/* Free the Avahi configuration data */

2308

1895

avahi_server_config_free(&config);

2310

1897

2311

1898

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

2312

1899

if(mc.server == NULL){

2313

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

2314

avahi_strerror(ret_errno));

1900

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

1901

avahi_strerror(error));

2315

1902

exitcode = EX_UNAVAILABLE;

2316

1903

goto end;

2317

1904

}

2325

1912

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2326

1913

NULL, 0, browse_callback, NULL);

2327

1914

if(sb == NULL){

2328

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

2329

avahi_strerror(avahi_server_errno(mc.server)));

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2330

1917

exitcode = EX_UNAVAILABLE;

2331

1918

goto end;

2332

1919

}

2338

1925

/* Run the main loop */

2339

1926

2340

1927

if(debug){

2341

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

1928

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

2342

1929

}

2343

1930

2344

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

2345

1932

(int)(retry_interval * 1000));

2346

1933

if(debug){

2347

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

2348

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

1934

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

1935

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

2349

1936

}

2350

1937

2351

1938

end:

2352

1939

2353

1940

if(debug){

2354

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

1941

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

2355

1942

}

2356

1943

2357

1944

/* Cleanup things */

2373

1960

if(gpgme_initialized){

2374

1961

gpgme_release(mc.ctx);

2375

1962

}

2376

1963

2377

1964

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

2378

1965

has seen */

2379

1966

if(mc.current_server != NULL){

2385

1972

}

2386

1973

}

2387

1974

2388

/* Re-raise priviliges */

2389

{

2390

raise_privileges();

2391

2392

/* Run network hooks */

2393

run_network_hooks("stop", interfaces_hooks, delay);

2394

2395

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

2396

{

2397

char *interface = NULL;

2398

while((interface=argz_next(interfaces_to_take_down,

2399

interfaces_to_take_down_size,

2400

interface))){

2401

ret_errno = take_down_interface(interface);

2402

if(ret_errno != 0){

2403

errno = ret_errno;

2404

perror_plus("Failed to take down interface");

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2405

1992

}

2406

1993

}

2407

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

2408

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

2409

" down\n");

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2410

2003

}

2411

2004

}

2412

2413

lower_privileges_permanently();

2414

2005

}

2415

2006

2416

free(interfaces_to_take_down);

2417

free(interfaces_hooks);

2418

2419

2007

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

2420

2008

if(tempdir_created){

2421

2009

struct dirent **direntries = NULL;

2434

2022

}

2435

2023

ret = remove(fullname);

2436

2024

if(ret == -1){

2437

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

2438

strerror(errno));

2025

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

2026

strerror(errno));

2439

2027

}

2440

2028

free(fullname);

2441

2029

}