/mandos/release : revision 237.7.137

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

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*

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* Everything else is

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13

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*

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

16

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

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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 */

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

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

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

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strtof(), abort() */

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*/

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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() */

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

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

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#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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91

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#ifdef __linux__

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93

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

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111

init_gnutls_session(),

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112

GNUTLS_* */

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113

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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/* GPGME */

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

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

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135

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

133

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

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138

135

139

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

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140

typedef struct server{

166

170

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/* Function to use when printing errors */

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172

void perror_plus(const char *print_text){

173

int e = errno;

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174

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

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program_invocation_short_name);

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errno = e;

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perror(print_text);

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}

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

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

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va_list ap;

183

va_start (ap, format);

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185

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

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program_invocation_short_name));

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

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}

189

174

190

/*

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191

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

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192

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

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193

* "buffer_length" is how much is already used.

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194

*/

179

195

size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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size_t buffer_capacity){

181

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

182

198

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

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199

if(buffer == NULL){

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205

}

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191

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

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int add_server(const char *ip, uint16_t port,

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AvahiIfIndex if_index,

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int af){

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

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int af){

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210

int ret;

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

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if(new_server == NULL){

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perror_plus("malloc");

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return -1;

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return false;

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}

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

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.port = port,

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.if_index = if_index,

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.af = af };

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.port = port,

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.if_index = if_index,

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.af = af };

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if(new_server->ip == NULL){

206

221

perror_plus("strdup");

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return -1;

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return false;

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}

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/* Special case of first server */

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if (mc.current_server == NULL){

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236

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

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237

if(ret == -1){

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238

perror_plus("clock_gettime");

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return -1;

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return false;

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240

}

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return 0;

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return true;

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}

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/*

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* Initialize GPGME.

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*/

232

static bool init_gpgme(const char *seckey,

233

const char *pubkey, const char *tempdir){

247

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

248

const char *tempdir){

234

249

gpgme_error_t rc;

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gpgme_engine_info_t engine_info;

236

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266

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

253

268

if(rc != GPG_ERR_NO_ERROR){

254

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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272

}

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273

259

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rc = gpgme_op_import(mc.ctx, pgp_data);

260

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if(rc != GPG_ERR_NO_ERROR){

261

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

262

gpgme_strsource(rc), gpgme_strerror(rc));

276

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

264

279

}

265

280

272

287

}

273

288

274

289

if(debug){

275

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

290

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

276

291

}

277

292

278

293

/* Init GPGME */

279

294

gpgme_check_version(NULL);

280

295

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

281

296

if(rc != GPG_ERR_NO_ERROR){

282

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

283

gpgme_strsource(rc), gpgme_strerror(rc));

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

284

299

return false;

285

300

}

286

301

287

302

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

288

303

rc = gpgme_get_engine_info(&engine_info);

289

304

if(rc != GPG_ERR_NO_ERROR){

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

292

307

return false;

293

308

}

294

309

while(engine_info != NULL){

300

315

engine_info = engine_info->next;

301

316

}

302

317

if(engine_info == NULL){

303

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

318

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

319

tempdir);

304

320

return false;

305

321

}

306

322

307

323

/* Create new GPGME "context" */

308

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

309

325

if(rc != GPG_ERR_NO_ERROR){

310

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

311

gpgme_strsource(rc), gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

312

329

return false;

313

330

}

314

331

333

350

ssize_t plaintext_length = 0;

334

351

335

352

if(debug){

336

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

353

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

337

354

}

338

355

339

356

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

340

357

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

341

358

0);

342

359

if(rc != GPG_ERR_NO_ERROR){

343

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

344

gpgme_strsource(rc), gpgme_strerror(rc));

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

345

362

return -1;

346

363

}

347

364

348

365

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

349

366

rc = gpgme_data_new(&dh_plain);

350

367

if(rc != GPG_ERR_NO_ERROR){

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

353

371

gpgme_data_release(dh_crypto);

354

372

return -1;

355

373

}

358

376

data buffer */

359

377

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

360

378

if(rc != GPG_ERR_NO_ERROR){

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

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381

plaintext_length = -1;

364

382

if(debug){

365

383

gpgme_decrypt_result_t result;

366

384

result = gpgme_op_decrypt_result(mc.ctx);

367

385

if(result == NULL){

368

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

386

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

369

387

} else {

370

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

371

result->unsupported_algorithm);

372

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

373

result->wrong_key_usage);

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

374

392

if(result->file_name != NULL){

375

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

393

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

376

394

}

377

395

gpgme_recipient_t recipient;

378

396

recipient = result->recipients;

379

397

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

386

405

recipient = recipient->next;

387

406

}

388

407

}

391

410

}

392

411

393

412

if(debug){

394

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

413

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

395

414

}

396

415

397

416

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

404

423

*plaintext = NULL;

405

424

while(true){

406

425

plaintext_capacity = incbuffer(plaintext,

407

(size_t)plaintext_length,

408

plaintext_capacity);

426

(size_t)plaintext_length,

427

plaintext_capacity);

409

428

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

413

432

}

414

433

415

434

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

428

447

}

429

448

430

449

if(debug){

431

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

450

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

432

451

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

433

452

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

434

453

}

456

475

/* GnuTLS log function callback */

457

476

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

458

477

const char* string){

459

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

478

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

460

479

}

461

480

462

481

static int init_gnutls_global(const char *pubkeyfilename,

464

483

int ret;

465

484

466

485

if(debug){

467

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

486

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

468

487

}

469

488

470

489

ret = gnutls_global_init();

471

490

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

491

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

492

safer_gnutls_strerror(ret));

474

493

return -1;

475

494

}

476

495

485

504

/* OpenPGP credentials */

486

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

487

506

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

507

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

508

safer_gnutls_strerror(ret));

490

509

gnutls_global_deinit();

491

510

return -1;

492

511

}

493

512

494

513

if(debug){

495

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

496

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

497

seckeyfilename);

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

498

518

}

499

519

500

520

ret = gnutls_certificate_set_openpgp_key_file

501

521

(mc.cred, pubkeyfilename, seckeyfilename,

502

522

GNUTLS_OPENPGP_FMT_BASE64);

503

523

if(ret != GNUTLS_E_SUCCESS){

504

fprintf(stderr,

505

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

506

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

507

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

508

safer_gnutls_strerror(ret));

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

509

529

goto globalfail;

510

530

}

511

531

512

532

/* GnuTLS server initialization */

513

533

ret = gnutls_dh_params_init(&mc.dh_params);

514

534

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

517

538

goto globalfail;

518

539

}

519

540

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

520

541

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

542

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

543

safer_gnutls_strerror(ret));

523

544

goto globalfail;

524

545

}

525

546

545

566

}

546

567

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

547

568

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

550

572

}

551

573

552

574

{

559

581

}

560

582

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

561

583

if(ret != GNUTLS_E_SUCCESS){

562

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

563

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

564

safer_gnutls_strerror(ret));

584

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

585

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

586

safer_gnutls_strerror(ret));

565

587

gnutls_deinit(*session);

566

588

return -1;

567

589

}

576

598

}

577

599

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

578

600

if(ret != GNUTLS_E_SUCCESS){

579

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

580

safer_gnutls_strerror(ret));

601

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

602

safer_gnutls_strerror(ret));

581

603

gnutls_deinit(*session);

582

604

return -1;

583

605

}

628

650

pf = PF_INET;

629

651

break;

630

652

default:

631

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

653

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

632

654

errno = EINVAL;

633

655

return -1;

634

656

}

639

661

}

640

662

641

663

if(debug){

642

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

643

"\n", ip, port);

664

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

665

PRIu16 "\n", ip, port);

644

666

}

645

667

646

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

672

694

}

673

695

if(ret == 0){

674

696

int e = errno;

675

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

697

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

676

698

errno = e;

677

699

goto mandos_end;

678

700

}

683

705

684

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

707

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

686

-Wunreachable-code*/

708

-Wunreachable-code*/

687

709

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

710

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

711

" incomplete without a network interface\n");

690

712

errno = EINVAL;

691

713

goto mandos_end;

692

714

}

710

732

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

711

733

perror_plus("if_indextoname");

712

734

} else {

713

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

714

ip, interface, port);

735

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

736

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

715

737

}

716

738

} else {

717

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

718

port);

739

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

740

ip, port);

719

741

}

720

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

731

753

perror_plus("inet_ntop");

732

754

} else {

733

755

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

734

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

756

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

735

757

}

736

758

}

737

759

}

765

787

while(true){

766

788

size_t out_size = strlen(out);

767

789

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

768

out_size - written));

790

out_size - written));

769

791

if(ret == -1){

770

792

int e = errno;

771

793

perror_plus("write");

791

813

}

792

814

793

815

if(debug){

794

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

816

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

795

817

}

796

818

797

819

if(quit_now){

799

821

goto mandos_end;

800

822

}

801

823

802

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

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

824

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

825

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

826

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

827

gnutls_transport_set_ptr(session,

828

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

804

829

805

830

if(quit_now){

806

831

errno = EINTR;

817

842

818

843

if(ret != GNUTLS_E_SUCCESS){

819

844

if(debug){

820

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

845

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

821

846

gnutls_perror(ret);

822

847

}

823

848

errno = EPROTO;

827

852

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

828

853

829

854

if(debug){

830

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

831

ip);

855

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

856

" %s\n", ip);

832

857

}

833

858

834

859

while(true){

839

864

}

840

865

841

866

buffer_capacity = incbuffer(&buffer, buffer_length,

842

buffer_capacity);

867

buffer_capacity);

843

868

if(buffer_capacity == 0){

844

869

int e = errno;

845

870

perror_plus("incbuffer");

872

897

}

873

898

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

874

899

if(ret < 0){

875

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

900

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

901

"***\n");

876

902

gnutls_perror(ret);

877

903

errno = EPROTO;

878

904

goto mandos_end;

879

905

}

880

906

break;

881

907

default:

882

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

883

" encrypted session with Mandos server\n");

908

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

909

" encrypted session with Mandos server\n");

884

910

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

911

errno = EIO;

886

912

goto mandos_end;

891

917

}

892

918

893

919

if(debug){

894

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

920

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

895

921

}

896

922

897

923

if(quit_now){

909

935

910

936

if(buffer_length > 0){

911

937

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

914

939

&decrypted_buffer);

915

940

if(decrypted_buffer_size >= 0){

916

941

927

952

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

928

953

int e = errno;

929

954

if(debug){

930

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

931

strerror(errno));

955

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

956

strerror(errno));

932

957

}

933

958

errno = e;

934

959

goto mandos_end;

991

1016

switch(event){

992

1017

default:

993

1018

case AVAHI_RESOLVER_FAILURE:

994

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

995

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

996

avahi_strerror(avahi_server_errno(mc.server)));

1019

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

1020

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

1021

domain,

1022

avahi_strerror(avahi_server_errno(mc.server)));

997

1023

break;

998

1024

999

1025

case AVAHI_RESOLVER_FOUND:

1001

1027

char ip[AVAHI_ADDRESS_STR_MAX];

1002

1028

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

1003

1029

if(debug){

1004

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

1005

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

1006

ip, (intmax_t)interface, port);

1030

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

1031

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

1032

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

1007

1033

}

1008

1034

int ret = start_mandos_communication(ip, port, interface,

1009

1035

avahi_proto_to_af(proto));

1010

1036

if(ret == 0){

1011

1037

avahi_simple_poll_quit(mc.simple_poll);

1012

1038

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

1039

if(not add_server(ip, port, interface,

1040

avahi_proto_to_af(proto))){

1041

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

1042

" list\n", name);

1043

}

1015

1044

}

1016

1045

}

1017

1046

}

1041

1070

default:

1042

1071

case AVAHI_BROWSER_FAILURE:

1043

1072

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1073

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

1074

avahi_strerror(avahi_server_errno(mc.server)));

1046

1075

avahi_simple_poll_quit(mc.simple_poll);

1047

1076

return;

1048

1077

1055

1084

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

1056

1085

name, type, domain, protocol, 0,

1057

1086

resolve_callback, NULL) == NULL)

1058

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

1059

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

1087

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

1088

" %s\n", name,

1089

avahi_strerror(avahi_server_errno(mc.server)));

1060

1090

break;

1061

1091

1062

1092

case AVAHI_BROWSER_REMOVE:

1065

1095

case AVAHI_BROWSER_ALL_FOR_NOW:

1066

1096

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1067

1097

if(debug){

1068

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

1098

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

1099

" searching...\n");

1069

1100

}

1070

1101

break;

1071

1102

}

1110

1141

/* Reject the loopback device */

1111

1142

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

1143

if(debug){

1113

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

1114

ifname);

1144

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

1145

ifname);

1115

1146

}

1116

1147

return false;

1117

1148

}

1118

1149

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

1119

1150

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

1120

1151

if(debug){

1121

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

1122

ifname);

1152

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

1153

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

1123

1154

}

1124

1155

return true;

1125

1156

}

1126

1157

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

1127

1158

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

1128

1159

if(debug){

1129

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

1130

ifname);

1160

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1161

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

1131

1162

}

1132

1163

return false;

1133

1164

}

1134

1165

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

1135

1166

if(ifr->ifr_flags & IFF_NOARP){

1136

1167

if(debug){

1137

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

1168

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

1169

ifname);

1138

1170

}

1139

1171

return false;

1140

1172

}

1141

1173

1142

1174

/* Accept this device */

1143

1175

if(debug){

1144

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

1176

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

1145

1177

}

1146

1178

return true;

1147

1179

}

1159

1191

struct ifreq ifr;

1160

1192

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

1161

1193

if(debug){

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1194

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

1195

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

1164

1196

}

1165

1197

return 0;

1166

1198

}

1184

1216

struct ifreq ifr;

1185

1217

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

1186

1218

if(debug){

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1219

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

1220

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

1189

1221

}

1190

1222

return 0;

1191

1223

}

1193

1225

/* Reject down interfaces */

1194

1226

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

1195

1227

if(debug){

1196

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

1197

if_entry->d_name);

1228

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

1229

if_entry->d_name);

1198

1230

}

1199

1231

return 0;

1200

1232

}

1202

1234

/* Reject non-running interfaces */

1203

1235

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

1204

1236

if(debug){

1205

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

1206

if_entry->d_name);

1237

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

1238

if_entry->d_name);

1207

1239

}

1208

1240

return 0;

1209

1241

}

1228

1260

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

1229

1261

int runnable_hook(const struct dirent *direntry){

1230

1262

int ret;

1263

size_t sret;

1231

1264

struct stat st;

1232

1265

1233

1266

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

1235

1268

return 0;

1236

1269

}

1237

1270

1238

/* Save pointer to last character */

1239

char *end = strchr(direntry->d_name, '\0')-1;

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

and (*end == '#')){

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

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);

1255

1292

if(ret == -1){

1256

1293

if(debug){

1257

perror_plus("Could not stat plugin");

1294

perror_plus("Could not stat hook");

1258

1295

}

1259

1296

return 0;

1260

1297

}

1261

1298

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

1262

1299

/* Not a regular file */

1300

if(debug){

1301

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

1302

direntry->d_name);

1303

}

1263

1304

return 0;

1264

1305

}

1265

1306

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

1266

1307

/* Not executable */

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1267

1312

return 0;

1268

1313

}

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1269

1318

return 1;

1270

1319

}

1271

1320

1278

1327

while(true){

1279

1328

if(mc.current_server == NULL){

1280

1329

if (debug){

1281

fprintf(stderr,

1282

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

1330

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

1331

" No timeout!\n");

1283

1332

}

1284

1333

ret = avahi_simple_poll_iterate(s, -1);

1285

1334

} else {

1286

1335

if (debug){

1287

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

1288

" or wait\n");

1336

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

1337

" it, or wait\n");

1289

1338

}

1290

1339

/* the current time */

1291

1340

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1307

1356

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

1308

1357

1309

1358

if (debug){

1310

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

1359

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

1360

block_time);

1311

1361

}

1312

1362

1313

1363

if(block_time <= 0){

1333

1383

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

1334

1384

}

1335

1385

if(ret != 0){

1336

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

1386

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

1337

1387

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

1338

1388

}

1339

1389

}

1340

1390

}

1341

1391

}

1342

1392

1393

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

1394

const float delay){

1395

struct dirent **direntries;

1396

struct dirent *direntry;

1397

int ret;

1398

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

1399

alphasort);

1400

if(numhooks == -1){

1401

perror_plus("scandir");

1402

} else {

1403

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

1404

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

1405

direntry = direntries[i];

1406

char *fullname = NULL;

1407

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

1408

if(ret < 0){

1409

perror_plus("asprintf");

1410

continue;

1411

}

1412

if(debug){

1413

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

1414

direntry->d_name);

1415

}

1416

pid_t hook_pid = fork();

1417

if(hook_pid == 0){

1418

/* Child */

1419

/* Raise privileges */

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1431

/* Set group */

1432

errno = 0;

1433

ret = setgid(0);

1434

if(ret == -1){

1435

perror_plus("setgid");

1436

}

1437

/* Reset supplementary groups */

1438

errno = 0;

1439

ret = setgroups(0, NULL);

1440

if(ret == -1){

1441

perror_plus("setgroups");

1442

}

1443

dup2(devnull, STDIN_FILENO);

1444

close(devnull);

1445

dup2(STDERR_FILENO, STDOUT_FILENO);

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

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

1462

if(ret == -1){

1463

perror_plus("setenv");

1464

_exit(EX_OSERR);

1465

}

1466

char *delaystring;

1467

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

1468

if(ret == -1){

1469

perror_plus("asprintf");

1470

_exit(EX_OSERR);

1471

}

1472

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

1473

if(ret == -1){

1474

free(delaystring);

1475

perror_plus("setenv");

1476

_exit(EX_OSERR);

1477

}

1478

free(delaystring);

1479

if(connect_to != NULL){

1480

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

1481

if(ret == -1){

1482

perror_plus("setenv");

1483

_exit(EX_OSERR);

1484

}

1485

}

1486

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

1487

perror_plus("execl");

1488

_exit(EXIT_FAILURE);

1489

}

1490

} else {

1491

int status;

1492

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

1493

perror_plus("waitpid");

1494

free(fullname);

1495

continue;

1496

}

1497

if(WIFEXITED(status)){

1498

if(WEXITSTATUS(status) != 0){

1499

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

1500

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

1501

WEXITSTATUS(status));

1502

free(fullname);

1503

continue;

1504

}

1505

} else if(WIFSIGNALED(status)){

1506

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

1507

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

1508

WTERMSIG(status));

1509

free(fullname);

1510

continue;

1511

} else {

1512

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

1513

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

1514

free(fullname);

1515

continue;

1516

}

1517

}

1518

free(fullname);

1519

if(debug){

1520

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

1521

direntry->d_name);

1522

}

1523

}

1524

close(devnull);

1525

}

1526

return true;

1527

}

1528

1343

1529

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

1344

1530

AvahiSServiceBrowser *sb = NULL;

1345

1531

int error;

1425

1611

.group = 2 },

1426

1612

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

1427

1613

.arg = "SECONDS",

1428

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

1614

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

1615

.group = 2 },

1616

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

1617

.arg = "DIR",

1618

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

1429

1619

.group = 2 },

1430

1620

/*

1431

1621

* These reproduce what we would get without ARGP_NO_HELP

1485

1675

argp_error(state, "Bad retry interval");

1486

1676

}

1487

1677

break;

1678

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

1679

hookdir = arg;

1680

break;

1488

1681

/*

1489

1682

* These reproduce what we would get without ARGP_NO_HELP

1490

1683

*/

1496

1689

argp_state_help(state, state->out_stream,

1497

1690

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

1691

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

1499

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

1692

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

1500

1693

exit(argp_err_exit_status);

1501

1694

break;

1502

1695

default:

1529

1722

{

1530

1723

/* Work around Debian bug #633582:

1531

1724

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

1532

struct stat st;

1533

1725

1534

1726

/* Re-raise priviliges */

1535

1727

errno = 0;

1536

1728

ret = seteuid(0);

1537

1729

if(ret == -1){

1538

1730

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1731

} else {

1732

struct stat st;

1733

1734

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

1735

int seckey_fd = open(seckey, O_RDONLY);

1736

if(seckey_fd == -1){

1737

perror_plus("open");

1738

} else {

1739

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

1740

if(ret == -1){

1741

perror_plus("fstat");

1742

} else {

1743

if(S_ISREG(st.st_mode)

1744

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

1745

ret = fchown(seckey_fd, uid, gid);

1746

if(ret == -1){

1747

perror_plus("fchown");

1748

}

1749

}

1750

}

1751

TEMP_FAILURE_RETRY(close(seckey_fd));

1752

}

1753

}

1754

1755

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

1756

int pubkey_fd = open(pubkey, O_RDONLY);

1757

if(pubkey_fd == -1){

1758

perror_plus("open");

1759

} else {

1760

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

1761

if(ret == -1){

1762

perror_plus("fstat");

1763

} else {

1764

if(S_ISREG(st.st_mode)

1765

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

1766

ret = fchown(pubkey_fd, uid, gid);

1767

if(ret == -1){

1768

perror_plus("fchown");

1769

}

1770

}

1771

}

1772

TEMP_FAILURE_RETRY(close(pubkey_fd));

1773

}

1774

}

1775

1776

/* Lower privileges */

1777

errno = 0;

1778

ret = seteuid(uid);

1779

if(ret == -1){

1780

perror_plus("seteuid");

1781

}

1586

1782

}

1587

1783

}

1588

1784

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

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

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

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

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

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

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

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

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

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

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

ret = execl(fullname, direntry->d_name, "start", NULL);

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

1644

goto end;

1645

}

1646

}

1647

close(devnull);

1785

/* Run network hooks */

1786

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

1787

goto end;

1648

1788

}

1649

1789

1650

1790

if(not debug){

1666

1806

/* Pick the first interface returned */

1667

1807

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

1668

1808

if(debug){

1669

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

1809

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

1670

1810

}

1671

1811

if(interface == NULL){

1672

1812

perror_plus("malloc");

1677

1817

free(direntries);

1678

1818

} else {

1679

1819

free(direntries);

1680

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

1820

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

1681

1821

exitcode = EXIT_FAILURE;

1682

1822

goto end;

1683

1823

}

1689

1829

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

1690

1830

mc.simple_poll = avahi_simple_poll_new();

1691

1831

if(mc.simple_poll == NULL){

1692

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

1832

fprintf_plus(stderr,

1833

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

1693

1834

exitcode = EX_UNAVAILABLE;

1694

1835

goto end;

1695

1836

}

1761

1902

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

1762

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

1904

if(if_index == 0){

1764

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

1905

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

1765

1906

exitcode = EX_UNAVAILABLE;

1766

1907

goto end;

1767

1908

}

1887

2028

#endif /* __linux__ */

1888

2029

/* Lower privileges */

1889

2030

errno = 0;

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

} else {

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

perror_plus("setuid");

1901

}

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

1902

2035

}

1903

2036

}

1904

2037

1908

2041

1909

2042

ret = init_gnutls_global(pubkey, seckey);

1910

2043

if(ret == -1){

1911

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

2044

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

1912

2045

exitcode = EX_UNAVAILABLE;

1913

2046

goto end;

1914

2047

} else {

1930

2063

}

1931

2064

1932

2065

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

1933

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

2066

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

1934

2067

exitcode = EX_UNAVAILABLE;

1935

2068

goto end;

1936

2069

} else {

1946

2079

/* (Mainly meant for debugging) */

1947

2080

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

1948

2081

if(address == NULL){

1949

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

2082

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

1950

2083

exitcode = EX_USAGE;

1951

2084

goto end;

1952

2085

}

1960

2093

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

1961

2094

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

1962

2095

or tmpmax != (uint16_t)tmpmax){

1963

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

2096

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

1964

2097

exitcode = EX_USAGE;

1965

2098

goto end;

1966

2099

}

1996

2129

break;

1997

2130

}

1998

2131

if(debug){

1999

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

2000

(int)retry_interval);

2132

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

2133

(int)retry_interval);

2001

2134

}

2002

2135

sleep((int)retry_interval);

2003

2136

}

2033

2166

2034

2167

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

2035

2168

if(mc.server == NULL){

2036

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

2037

avahi_strerror(error));

2169

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

2170

avahi_strerror(error));

2038

2171

exitcode = EX_UNAVAILABLE;

2039

2172

goto end;

2040

2173

}

2048

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2049

2182

NULL, 0, browse_callback, NULL);

2050

2183

if(sb == NULL){

2051

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

2052

avahi_strerror(avahi_server_errno(mc.server)));

2184

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

2185

avahi_strerror(avahi_server_errno(mc.server)));

2053

2186

exitcode = EX_UNAVAILABLE;

2054

2187

goto end;

2055

2188

}

2061

2194

/* Run the main loop */

2062

2195

2063

2196

if(debug){

2064

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

2197

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

2065

2198

}

2066

2199

2067

2200

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

2201

(int)(retry_interval * 1000));

2069

2202

if(debug){

2070

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

2071

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

2203

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

2204

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

2072

2205

}

2073

2206

2074

2207

end:

2075

2208

2076

2209

if(debug){

2077

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

2210

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

2078

2211

}

2079

2212

2080

2213

/* Cleanup things */

2096

2229

if(gpgme_initialized){

2097

2230

gpgme_release(mc.ctx);

2098

2231

}

2099

2232

2100

2233

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

2101

2234

has seen */

2102

2235

if(mc.current_server != NULL){

2108

2241

}

2109

2242

}

2110

2243

2111

/* XXX run network hooks "stop" here */

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2112

2246

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2247

/* Re-raise priviliges */

2248

{

2116

2249

errno = 0;

2117

2250

ret = seteuid(0);

2118

2251

if(ret == -1){

2119

2252

perror_plus("seteuid");

2120

2253

}

2121

if(geteuid() == 0){

2254

2255

/* Take down the network interface */

2256

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

2122

2257

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

2123

2258

if(ret == -1){

2124

2259

perror_plus("ioctl SIOCGIFFLAGS");

2125

} else if(network.ifr_flags & IFF_UP) {

2260

} else if(network.ifr_flags & IFF_UP){

2126

2261

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

2127

2262

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

2128

2263

if(ret == -1){

2133

2268

if(ret == -1){

2134

2269

perror_plus("close");

2135

2270

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

perror_plus("setuid");

2141

}

2142

2271

}

2143

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2144

2279

2145

2280

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

2146

2281

if(tempdir_created){

2160

2295

}

2161

2296

ret = remove(fullname);

2162

2297

if(ret == -1){

2163

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

2164

strerror(errno));

2298

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

2299

strerror(errno));

2165

2300

}

2166

2301

free(fullname);

2167

2302

}