/mandos/release : revision 237.16.6

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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

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() */

44

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

44

#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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*/

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

79

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

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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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#ifdef __linux__

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

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

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135

char *connect_to = NULL;

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136

const char *hookdir = HOOKDIR;

138

uid_t uid = 65534;

139

gid_t gid = 65534;

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137

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138

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

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typedef struct server{

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/* Function to use when printing errors */

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171

void perror_plus(const char *print_text){

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int e = errno;

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172

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)))

183

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

184

va_list ap;

185

va_start (ap, format);

186

187

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

188

program_invocation_short_name));

189

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

190

}

191

192

177

/*

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178

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

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179

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

207

192

}

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

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

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int af){

195

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

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int af){

212

197

int ret;

213

198

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

214

199

if(new_server == NULL){

215

200

perror_plus("malloc");

216

return false;

201

return -1;

217

202

}

218

203

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

219

204

.port = port,

221

206

.af = af };

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if(new_server->ip == NULL){

223

208

perror_plus("strdup");

224

return false;

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return -1;

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210

}

226

211

/* Special case of first server */

227

212

if (mc.current_server == NULL){

238

223

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

239

224

if(ret == -1){

240

225

perror_plus("clock_gettime");

241

return false;

226

return -1;

242

227

}

243

return true;

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return 0;

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229

}

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230

246

231

/*

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253

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

270

255

if(rc != GPG_ERR_NO_ERROR){

271

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

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gpgme_strsource(rc), gpgme_strerror(rc));

256

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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259

return false;

274

260

}

275

261

276

262

rc = gpgme_op_import(mc.ctx, pgp_data);

277

263

if(rc != GPG_ERR_NO_ERROR){

278

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

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gpgme_strsource(rc), gpgme_strerror(rc));

264

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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267

return false;

281

268

}

282

269

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276

}

290

277

291

278

if(debug){

292

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

279

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

280

"Initializing GPGME\n");

293

281

}

294

282

295

283

/* Init GPGME */

296

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gpgme_check_version(NULL);

297

285

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

298

286

if(rc != GPG_ERR_NO_ERROR){

299

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

300

gpgme_strsource(rc), gpgme_strerror(rc));

287

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

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

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gpgme_strsource(rc), gpgme_strerror(rc));

301

290

return false;

302

291

}

303

292

304

293

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

305

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rc = gpgme_get_engine_info(&engine_info);

306

295

if(rc != GPG_ERR_NO_ERROR){

307

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

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gpgme_strsource(rc), gpgme_strerror(rc));

296

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

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

309

299

return false;

310

300

}

311

301

while(engine_info != NULL){

317

307

engine_info = engine_info->next;

318

308

}

319

309

if(engine_info == NULL){

320

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

321

tempdir);

310

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

311

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

322

312

return false;

323

313

}

324

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325

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/* Create new GPGME "context" */

326

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

327

317

if(rc != GPG_ERR_NO_ERROR){

328

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

329

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

330

gpgme_strerror(rc));

318

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

319

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

320

gpgme_strerror(rc));

331

321

return false;

332

322

}

333

323

352

342

ssize_t plaintext_length = 0;

353

343

354

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if(debug){

355

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

345

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

346

"Trying to decrypt OpenPGP data\n");

356

347

}

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348

358

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

359

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rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

360

351

0);

361

352

if(rc != GPG_ERR_NO_ERROR){

362

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

363

gpgme_strsource(rc), gpgme_strerror(rc));

353

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

354

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

355

gpgme_strsource(rc), gpgme_strerror(rc));

364

356

return -1;

365

357

}

366

358

367

359

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

368

360

rc = gpgme_data_new(&dh_plain);

369

361

if(rc != GPG_ERR_NO_ERROR){

370

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

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

362

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

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

373

365

gpgme_data_release(dh_crypto);

374

366

return -1;

375

367

}

378

370

data buffer */

379

371

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

380

372

if(rc != GPG_ERR_NO_ERROR){

381

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

382

gpgme_strsource(rc), gpgme_strerror(rc));

373

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

374

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

375

gpgme_strsource(rc), gpgme_strerror(rc));

383

376

plaintext_length = -1;

384

377

if(debug){

385

378

gpgme_decrypt_result_t result;

386

379

result = gpgme_op_decrypt_result(mc.ctx);

387

380

if(result == NULL){

388

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

381

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

382

"gpgme_op_decrypt_result failed\n");

389

383

} else {

390

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

391

result->unsupported_algorithm);

392

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

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result->wrong_key_usage);

384

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

385

"Unsupported algorithm: %s\n",

386

result->unsupported_algorithm);

387

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

388

"Wrong key usage: %u\n",

389

result->wrong_key_usage);

394

390

if(result->file_name != NULL){

395

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

391

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

392

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

396

393

}

397

394

gpgme_recipient_t recipient;

398

395

recipient = result->recipients;

399

396

while(recipient != NULL){

400

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

401

gpgme_pubkey_algo_name

402

(recipient->pubkey_algo));

403

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

404

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

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "No" : "Yes");

397

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

398

"Public key algorithm: %s\n",

399

gpgme_pubkey_algo_name(recipient->pubkey_algo));

400

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

401

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

402

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

403

"Secret key available: %s\n",

404

recipient->status == GPG_ERR_NO_SECKEY

405

? "No" : "Yes");

407

406

recipient = recipient->next;

408

407

}

409

408

}

412

411

}

413

412

414

413

if(debug){

415

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

416

}

417

418

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

449

}

450

451

if(debug){

452

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

452

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

453

"Decrypted password is: ");

453

454

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

454

455

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

455

456

}

477

478

/* GnuTLS log function callback */

478

479

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

479

480

const char* string){

480

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

481

fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);

481

482

}

482

483

484

static int init_gnutls_global(const char *pubkeyfilename,

485

486

int ret;

486

487

488

if(debug){

488

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

489

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

490

"Initializing GnuTLS\n");

489

491

}

490

492

491

493

ret = gnutls_global_init();

492

494

if(ret != GNUTLS_E_SUCCESS){

493

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

494

safer_gnutls_strerror(ret));

495

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

496

"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

495

497

return -1;

496

498

}

497

499

506

508

/* OpenPGP credentials */

507

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

508

510

if(ret != GNUTLS_E_SUCCESS){

509

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

510

safer_gnutls_strerror(ret));

511

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

512

"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

511

513

gnutls_global_deinit();

512

514

return -1;

513

515

}

514

516

515

517

if(debug){

516

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

517

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

518

pubkeyfilename,

519

seckeyfilename);

518

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

519

"Attempting to use OpenPGP public key %s and"

520

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

521

seckeyfilename);

520

522

}

521

523

522

524

ret = gnutls_certificate_set_openpgp_key_file

523

525

(mc.cred, pubkeyfilename, seckeyfilename,

524

526

GNUTLS_OPENPGP_FMT_BASE64);

525

527

if(ret != GNUTLS_E_SUCCESS){

526

fprintf_plus(stderr,

527

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

528

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

529

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

530

safer_gnutls_strerror(ret));

528

fprintf(stderr,

529

"Mandos plugin mandos-client: "

530

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

531

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

532

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

533

"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

531

534

goto globalfail;

532

535

}

533

536

534

537

/* GnuTLS server initialization */

535

538

ret = gnutls_dh_params_init(&mc.dh_params);

536

539

if(ret != GNUTLS_E_SUCCESS){

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

538

" initialization: %s\n",

539

safer_gnutls_strerror(ret));

540

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

541

"Error in GnuTLS DH parameter initialization:"

542

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

540

543

goto globalfail;

541

544

}

542

545

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

543

546

if(ret != GNUTLS_E_SUCCESS){

544

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

545

safer_gnutls_strerror(ret));

547

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

548

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

549

safer_gnutls_strerror(ret));

546

550

goto globalfail;

547

551

}

548

552

568

572

}

569

573

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

570

574

if(ret != GNUTLS_E_SUCCESS){

571

fprintf_plus(stderr,

572

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

573

safer_gnutls_strerror(ret));

575

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

576

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

577

safer_gnutls_strerror(ret));

574

578

}

575

579

576

580

{

583

587

}

584

588

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

585

589

if(ret != GNUTLS_E_SUCCESS){

586

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

587

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

588

safer_gnutls_strerror(ret));

590

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

591

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

592

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

593

"GnuTLS error: %s\n", safer_gnutls_strerror(ret));

589

594

gnutls_deinit(*session);

590

595

return -1;

591

596

}

600

605

}

601

606

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

602

607

if(ret != GNUTLS_E_SUCCESS){

603

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

604

safer_gnutls_strerror(ret));

608

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

609

"Error setting GnuTLS credentials: %s\n",

610

safer_gnutls_strerror(ret));

605

611

gnutls_deinit(*session);

606

612

return -1;

607

613

}

652

658

pf = PF_INET;

653

659

break;

654

660

default:

655

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

661

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

662

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

656

663

errno = EINVAL;

657

664

return -1;

658

665

}

663

670

}

664

671

665

672

if(debug){

666

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

667

PRIu16 "\n", ip, port);

673

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

674

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

675

"\n", ip, port);

668

676

}

669

677

670

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

696

704

}

697

705

if(ret == 0){

698

706

int e = errno;

699

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

707

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

708

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

700

709

errno = e;

701

710

goto mandos_end;

702

711

}

709

718

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

710

719

-Wunreachable-code*/

711

720

if(if_index == AVAHI_IF_UNSPEC){

712

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

713

" incomplete without a network interface\n");

721

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

722

"An IPv6 link-local address is incomplete"

723

" without a network interface\n");

714

724

errno = EINVAL;

715

725

goto mandos_end;

716

726

}

734

744

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

735

745

perror_plus("if_indextoname");

736

746

} else {

737

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

738

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

747

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

748

"Connection to: %s%%%s, port %" PRIu16 "\n",

749

ip, interface, port);

739

750

}

740

751

} else {

741

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

742

ip, port);

752

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

753

"Connection to: %s, port %" PRIu16 "\n", ip, port);

743

754

}

744

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

745

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

755

766

perror_plus("inet_ntop");

756

767

} else {

757

768

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

758

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

769

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

770

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

759

771

}

760

772

}

761

773

}

815

827

}

816

828

817

829

if(debug){

818

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

830

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

831

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

819

832

}

820

833

821

834

if(quit_now){

823

836

goto mandos_end;

824

837

}

825

838

826

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

827

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

828

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

829

gnutls_transport_set_ptr(session,

830

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

839

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

840

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

831

841

832

842

if(quit_now){

833

843

errno = EINTR;

844

854

845

855

if(ret != GNUTLS_E_SUCCESS){

846

856

if(debug){

847

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

857

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

858

"*** GnuTLS Handshake failed ***\n");

848

859

gnutls_perror(ret);

849

860

}

850

861

errno = EPROTO;

854

865

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

855

866

856

867

if(debug){

857

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

858

" %s\n", ip);

868

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

869

"Retrieving OpenPGP encrypted password from %s\n", ip);

859

870

}

860

871

861

872

while(true){

899

910

}

900

911

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

901

912

if(ret < 0){

902

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

903

"***\n");

913

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

914

"*** GnuTLS Re-handshake failed ***\n");

904

915

gnutls_perror(ret);

905

916

errno = EPROTO;

906

917

goto mandos_end;

907

918

}

908

919

break;

909

920

default:

910

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

911

" encrypted session with Mandos server\n");

921

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

922

"Unknown error while reading data from"

923

" encrypted session with Mandos server\n");

912

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

913

925

errno = EIO;

914

926

goto mandos_end;

919

931

}

920

932

921

933

if(debug){

922

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

934

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

935

"Closing TLS session\n");

923

936

}

924

937

925

938

if(quit_now){

954

967

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

955

968

int e = errno;

956

969

if(debug){

957

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

958

strerror(errno));

970

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

971

"Error writing encrypted data: %s\n",

972

strerror(errno));

959

973

}

960

974

errno = e;

961

975

goto mandos_end;

1018

1032

switch(event){

1019

1033

default:

1020

1034

case AVAHI_RESOLVER_FAILURE:

1021

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

1022

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

1023

domain,

1024

avahi_strerror(avahi_server_errno(mc.server)));

1035

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

1036

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

1037

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

1038

avahi_strerror(avahi_server_errno(mc.server)));

1025

1039

break;

1026

1040

1027

1041

case AVAHI_RESOLVER_FOUND:

1029

1043

char ip[AVAHI_ADDRESS_STR_MAX];

1030

1044

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

1031

1045

if(debug){

1032

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

1033

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

1034

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

1046

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

1047

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

1048

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

1049

ip, (intmax_t)interface, port);

1035

1050

}

1036

1051

int ret = start_mandos_communication(ip, port, interface,

1037

1052

avahi_proto_to_af(proto));

1038

1053

if(ret == 0){

1039

1054

avahi_simple_poll_quit(mc.simple_poll);

1040

1055

} else {

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1043

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

1044

" list\n", name);

1045

}

1056

ret = add_server(ip, port, interface,

1057

avahi_proto_to_af(proto));

1046

1058

}

1047

1059

}

1048

1060

}

1072

1084

default:

1073

1085

case AVAHI_BROWSER_FAILURE:

1074

1086

1075

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

1076

avahi_strerror(avahi_server_errno(mc.server)));

1087

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

1088

"(Avahi browser) %s\n",

1089

avahi_strerror(avahi_server_errno(mc.server)));

1077

1090

avahi_simple_poll_quit(mc.simple_poll);

1078

1091

return;

1079

1092

1086

1099

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

1087

1100

name, type, domain, protocol, 0,

1088

1101

resolve_callback, NULL) == NULL)

1089

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

1090

" %s\n", name,

1091

avahi_strerror(avahi_server_errno(mc.server)));

1102

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

1103

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

1104

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

1092

1105

break;

1093

1106

1094

1107

case AVAHI_BROWSER_REMOVE:

1097

1110

case AVAHI_BROWSER_ALL_FOR_NOW:

1098

1111

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1099

1112

if(debug){

1100

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

1101

" searching...\n");

1113

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

1114

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

1102

1115

}

1103

1116

break;

1104

1117

}

1143

1156

/* Reject the loopback device */

1144

1157

if(ifr->ifr_flags & IFF_LOOPBACK){

1145

1158

if(debug){

1146

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

1147

ifname);

1159

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

1160

"Rejecting loopback interface \"%s\"\n", ifname);

1148

1161

}

1149

1162

return false;

1150

1163

}

1151

1164

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

1152

1165

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

1153

1166

if(debug){

1154

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

1155

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

1167

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

1168

"Accepting point-to-point interface \"%s\"\n", ifname);

1156

1169

}

1157

1170

return true;

1158

1171

}

1159

1172

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

1160

1173

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

1161

1174

if(debug){

1162

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1163

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

1175

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

1176

"Rejecting non-broadcast interface \"%s\"\n", ifname);

1164

1177

}

1165

1178

return false;

1166

1179

}

1167

1180

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

1168

1181

if(ifr->ifr_flags & IFF_NOARP){

1169

1182

if(debug){

1170

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

1171

ifname);

1183

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

1184

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

1172

1185

}

1173

1186

return false;

1174

1187

}

1175

1188

1176

1189

/* Accept this device */

1177

1190

if(debug){

1178

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

1191

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

1192

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

1179

1193

}

1180

1194

return true;

1181

1195

}

1193

1207

struct ifreq ifr;

1194

1208

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

1195

1209

if(debug){

1196

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

1197

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

1210

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

1211

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

1212

if_entry->d_name);

1198

1213

}

1199

1214

return 0;

1200

1215

}

1218

1233

struct ifreq ifr;

1219

1234

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

1220

1235

if(debug){

1221

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

1222

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

1236

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

1237

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

1238

if_entry->d_name);

1223

1239

}

1224

1240

return 0;

1225

1241

}

1227

1243

/* Reject down interfaces */

1228

1244

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

1229

1245

if(debug){

1230

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

1231

if_entry->d_name);

1246

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

1247

"Rejecting down interface \"%s\"\n",

1248

if_entry->d_name);

1232

1249

}

1233

1250

return 0;

1234

1251

}

1236

1253

/* Reject non-running interfaces */

1237

1254

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

1238

1255

if(debug){

1239

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

1240

if_entry->d_name);

1256

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

1257

"Rejecting non-running interface \"%s\"\n",

1258

if_entry->d_name);

1241

1259

}

1242

1260

return 0;

1243

1261

}

1277

1295

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

1278

1296

/* Contains non-allowed characters */

1279

1297

if(debug){

1280

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

1281

direntry->d_name);

1298

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

1299

"Ignoring hook \"%s\" with bad name\n",

1300

direntry->d_name);

1282

1301

}

1283

1302

return 0;

1284

1303

}

1300

1319

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

1301

1320

/* Not a regular file */

1302

1321

if(debug){

1303

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

1304

direntry->d_name);

1322

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

1323

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

1324

direntry->d_name);

1305

1325

}

1306

1326

return 0;

1307

1327

}

1308

1328

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

1309

1329

/* Not executable */

1310

1330

if(debug){

1311

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

1312

direntry->d_name);

1331

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

1332

"Ignoring hook \"%s\" - not executable\n",

1333

direntry->d_name);

1313

1334

}

1314

1335

return 0;

1315

1336

}

1316

if(debug){

1317

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

1318

direntry->d_name);

1319

}

1320

1337

return 1;

1321

1338

}

1322

1339

1329

1346

while(true){

1330

1347

if(mc.current_server == NULL){

1331

1348

if (debug){

1332

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

1333

" No timeout!\n");

1349

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

1350

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

1334

1351

}

1335

1352

ret = avahi_simple_poll_iterate(s, -1);

1336

1353

} else {

1337

1354

if (debug){

1338

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

1339

" it, or wait\n");

1355

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

1356

"Check current_server if we should run it,"

1357

" or wait\n");

1340

1358

}

1341

1359

/* the current time */

1342

1360

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1358

1376

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

1359

1377

1360

1378

if (debug){

1361

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

1362

block_time);

1379

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

1380

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

1363

1381

}

1364

1382

1365

1383

if(block_time <= 0){

1392

1410

}

1393

1411

}

1394

1412

1395

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

1396

int raise_privileges(void){

1397

int old_errno = errno;

1398

int ret_errno = 0;

1399

errno = 0;

1400

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

1401

perror_plus("seteuid");

1402

}

1403

ret_errno = errno;

1404

errno = old_errno;

1405

return ret_errno;

1406

}

1407

1408

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

1409

int raise_privileges_permanently(void){

1410

int old_errno = errno;

1411

int ret_errno = raise_privileges();

1412

if(ret_errno != 0){

1413

errno = old_errno;

1414

return ret_errno;

1415

}

1416

errno = 0;

1417

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

1418

perror_plus("seteuid");

1419

}

1420

ret_errno = errno;

1421

errno = old_errno;

1422

return ret_errno;

1423

}

1424

1425

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

1426

int lower_privileges(void){

1427

int old_errno = errno;

1428

int ret_errno = 0;

1429

errno = 0;

1430

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

1431

perror_plus("seteuid");

1432

}

1433

ret_errno = errno;

1434

errno = old_errno;

1435

return ret_errno;

1436

}

1437

1438

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

1439

const float delay){

1440

struct dirent **direntries;

1441

struct dirent *direntry;

1442

int ret;

1443

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

1444

alphasort);

1445

if(numhooks == -1){

1446

perror_plus("scandir");

1447

} else {

1448

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

1449

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

1450

direntry = direntries[i];

1451

char *fullname = NULL;

1452

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

1453

if(ret < 0){

1454

perror_plus("asprintf");

1455

continue;

1456

}

1457

if(debug){

1458

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

1459

direntry->d_name);

1460

}

1461

pid_t hook_pid = fork();

1462

if(hook_pid == 0){

1463

/* Child */

1464

/* Raise privileges */

1465

raise_privileges_permanently();

1466

/* Set group */

1467

errno = 0;

1468

ret = setgid(0);

1469

if(ret == -1){

1470

perror_plus("setgid");

1471

}

1472

/* Reset supplementary groups */

1473

errno = 0;

1474

ret = setgroups(0, NULL);

1475

if(ret == -1){

1476

perror_plus("setgroups");

1477

}

1478

dup2(devnull, STDIN_FILENO);

1479

close(devnull);

1480

dup2(STDERR_FILENO, STDOUT_FILENO);

1481

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

1482

if(ret == -1){

1483

perror_plus("setenv");

1484

_exit(EX_OSERR);

1485

}

1486

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

1487

if(ret == -1){

1488

perror_plus("setenv");

1489

_exit(EX_OSERR);

1490

}

1491

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

1492

if(ret == -1){

1493

perror_plus("setenv");

1494

_exit(EX_OSERR);

1495

}

1496

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

1497

if(ret == -1){

1498

perror_plus("setenv");

1499

_exit(EX_OSERR);

1500

}

1501

char *delaystring;

1502

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

1503

if(ret == -1){

1504

perror_plus("asprintf");

1505

_exit(EX_OSERR);

1506

}

1507

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

1508

if(ret == -1){

1509

free(delaystring);

1510

perror_plus("setenv");

1511

_exit(EX_OSERR);

1512

}

1513

free(delaystring);

1514

if(connect_to != NULL){

1515

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

1516

if(ret == -1){

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

}

1521

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

1522

perror_plus("execl");

1523

_exit(EXIT_FAILURE);

1524

}

1525

} else {

1526

int status;

1527

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

1528

perror_plus("waitpid");

1529

free(fullname);

1530

continue;

1531

}

1532

if(WIFEXITED(status)){

1533

if(WEXITSTATUS(status) != 0){

1534

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

1535

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

1536

WEXITSTATUS(status));

1537

free(fullname);

1538

continue;

1539

}

1540

} else if(WIFSIGNALED(status)){

1541

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

1542

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

1543

WTERMSIG(status));

1544

free(fullname);

1545

continue;

1546

} else {

1547

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

1548

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

1549

free(fullname);

1550

continue;

1551

}

1552

}

1553

free(fullname);

1554

if(debug){

1555

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

1556

direntry->d_name);

1557

}

1558

}

1559

close(devnull);

1560

}

1561

return true;

1562

}

1563

1564

int bring_up_interface(const char * const interface, const float delay){

1565

int sd = -1;

1566

int old_errno = errno;

1567

int ret_errno = 0;

1568

int ret;

1569

struct ifreq network;

1570

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1571

if(if_index == 0){

1572

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

1573

errno = old_errno;

1574

return ENXIO;

1575

}

1576

1577

if(quit_now){

1578

errno = old_errno;

1579

return EINTR;

1580

}

1581

1582

/* Re-raise priviliges */

1583

raise_privileges();

1584

1585

#ifdef __linux__

1586

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1587

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

1588

ret = klogctl(8, NULL, 5);

1589

bool restore_loglevel = true;

1590

if(ret == -1){

1591

restore_loglevel = false;

1592

perror_plus("klogctl");

1593

}

1594

#endif /* __linux__ */

1595

1596

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1597

if(sd < 0){

1598

ret_errno = errno;

1599

perror_plus("socket");

1600

#ifdef __linux__

1601

if(restore_loglevel){

1602

ret = klogctl(7, NULL, 0);

1603

if(ret == -1){

1604

perror_plus("klogctl");

1605

}

1606

}

1607

#endif /* __linux__ */

1608

/* Lower privileges */

1609

lower_privileges();

1610

errno = old_errno;

1611

return ret_errno;

1612

}

1613

strcpy(network.ifr_name, interface);

1614

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

1615

if(ret == -1){

1616

ret_errno = errno;

1617

perror_plus("ioctl SIOCGIFFLAGS");

1618

#ifdef __linux__

1619

if(restore_loglevel){

1620

ret = klogctl(7, NULL, 0);

1621

if(ret == -1){

1622

perror_plus("klogctl");

1623

}

1624

}

1625

#endif /* __linux__ */

1626

/* Lower privileges */

1627

lower_privileges();

1628

errno = old_errno;

1629

return ret_errno;

1630

}

1631

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

1632

network.ifr_flags |= IFF_UP;

1633

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

1634

if(ret == -1){

1635

ret_errno = errno;

1636

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1637

#ifdef __linux__

1638

if(restore_loglevel){

1639

ret = klogctl(7, NULL, 0);

1640

if(ret == -1){

1641

perror_plus("klogctl");

1642

}

1643

}

1644

#endif /* __linux__ */

1645

/* Lower privileges */

1646

lower_privileges();

1647

errno = old_errno;

1648

return ret_errno;

1649

}

1650

}

1651

/* Sleep checking until interface is running.

1652

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

1653

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

1654

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

1655

if(ret == -1){

1656

perror_plus("ioctl SIOCGIFFLAGS");

1657

} else if(network.ifr_flags & IFF_RUNNING){

1658

break;

1659

}

1660

struct timespec sleeptime = { .tv_nsec = 250000000 };

1661

ret = nanosleep(&sleeptime, NULL);

1662

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

1663

perror_plus("nanosleep");

1664

}

1665

}

1666

/* Close the socket */

1667

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

1668

if(ret == -1){

1669

perror_plus("close");

1670

}

1671

#ifdef __linux__

1672

if(restore_loglevel){

1673

/* Restores kernel loglevel to default */

1674

ret = klogctl(7, NULL, 0);

1675

if(ret == -1){

1676

perror_plus("klogctl");

1677

}

1678

}

1679

#endif /* __linux__ */

1680

/* Lower privileges */

1681

lower_privileges();

1682

errno = old_errno;

1683

return 0;

1684

}

1685

1686

1413

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

1687

1414

AvahiSServiceBrowser *sb = NULL;

1688

1415

int error;

1694

1421

struct ifreq network;

1695

1422

int sd = -1;

1696

1423

bool take_down_interface = false;

1424

uid_t uid;

1425

gid_t gid;

1697

1426

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

1698

1427

bool tempdir_created = false;

1699

1428

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1766

1495

.group = 2 },

1767

1496

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

1768

1497

.arg = "SECONDS",

1769

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

1498

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

1770

1499

.group = 2 },

1771

1500

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

1772

1501

.arg = "DIR",

1844

1573

argp_state_help(state, state->out_stream,

1845

1574

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1846

1575

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

1847

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

1576

fprintf(state->out_stream, "Mandos plugin mandos-client: ");

1577

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

1848

1578

exit(argp_err_exit_status);

1849

1579

break;

1850

1580

default:

1877

1607

{

1878

1608

/* Work around Debian bug #633582:

1879

1609

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

1610

struct stat st;

1880

1611

1881

1612

/* Re-raise priviliges */

1882

if(raise_privileges() == 0){

1883

struct stat st;

1884

1885

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

1886

int seckey_fd = open(seckey, O_RDONLY);

1887

if(seckey_fd == -1){

1888

perror_plus("open");

1889

} else {

1890

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

1891

if(ret == -1){

1892

perror_plus("fstat");

1893

} else {

1894

if(S_ISREG(st.st_mode)

1895

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

1896

ret = fchown(seckey_fd, uid, gid);

1897

if(ret == -1){

1898

perror_plus("fchown");

1899

}

1900

}

1901

}

1902

TEMP_FAILURE_RETRY(close(seckey_fd));

1903

}

1904

}

1905

1906

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

1907

int pubkey_fd = open(pubkey, O_RDONLY);

1908

if(pubkey_fd == -1){

1909

perror_plus("open");

1910

} else {

1911

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

1912

if(ret == -1){

1913

perror_plus("fstat");

1914

} else {

1915

if(S_ISREG(st.st_mode)

1916

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

1917

ret = fchown(pubkey_fd, uid, gid);

1918

if(ret == -1){

1919

perror_plus("fchown");

1920

}

1921

}

1922

}

1923

TEMP_FAILURE_RETRY(close(pubkey_fd));

1924

}

1925

}

1926

1927

/* Lower privileges */

1928

errno = 0;

1929

ret = seteuid(uid);

1930

if(ret == -1){

1931

perror_plus("seteuid");

1932

}

1613

errno = 0;

1614

ret = seteuid(0);

1615

if(ret == -1){

1616

perror_plus("seteuid");

1617

}

1618

1619

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

1620

int seckey_fd = open(seckey, O_RDONLY);

1621

if(seckey_fd == -1){

1622

perror_plus("open");

1623

} else {

1624

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

1625

if(ret == -1){

1626

perror_plus("fstat");

1627

} else {

1628

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

1629

ret = fchown(seckey_fd, uid, gid);

1630

if(ret == -1){

1631

perror_plus("fchown");

1632

}

1633

}

1634

}

1635

TEMP_FAILURE_RETRY(close(seckey_fd));

1636

}

1637

}

1638

1639

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

1640

int pubkey_fd = open(pubkey, O_RDONLY);

1641

if(pubkey_fd == -1){

1642

perror_plus("open");

1643

} else {

1644

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

1645

if(ret == -1){

1646

perror_plus("fstat");

1647

} else {

1648

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

1649

ret = fchown(pubkey_fd, uid, gid);

1650

if(ret == -1){

1651

perror_plus("fchown");

1652

}

1653

}

1654

}

1655

TEMP_FAILURE_RETRY(close(pubkey_fd));

1656

}

1657

}

1658

1659

/* Lower privileges */

1660

errno = 0;

1661

ret = seteuid(uid);

1662

if(ret == -1){

1663

perror_plus("seteuid");

1933

1664

}

1934

1665

}

1935

1666

1936

/* Run network hooks */

1937

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

1938

goto end;

1667

/* Find network hooks and run them */

1668

{

1669

struct dirent **direntries;

1670

struct dirent *direntry;

1671

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

1672

alphasort);

1673

if(numhooks == -1){

1674

perror_plus("scandir");

1675

} else {

1676

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

1677

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

1678

direntry = direntries[0];

1679

char *fullname = NULL;

1680

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

1681

if(ret < 0){

1682

perror_plus("asprintf");

1683

continue;

1684

}

1685

pid_t hook_pid = fork();

1686

if(hook_pid == 0){

1687

/* Child */

1688

dup2(devnull, STDIN_FILENO);

1689

close(devnull);

1690

dup2(STDERR_FILENO, STDOUT_FILENO);

1691

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

1692

if(ret == -1){

1693

perror_plus("setenv");

1694

exit(1);

1695

}

1696

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

1697

if(ret == -1){

1698

perror_plus("setenv");

1699

exit(1);

1700

}

1701

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

1702

if(ret == -1){

1703

perror_plus("setenv");

1704

exit(1);

1705

}

1706

char *delaystring;

1707

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

1708

if(ret == -1){

1709

perror_plus("asprintf");

1710

exit(1);

1711

}

1712

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

1713

if(ret == -1){

1714

free(delaystring);

1715

perror_plus("setenv");

1716

exit(1);

1717

}

1718

free(delaystring);

1719

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

1720

perror_plus("execl");

1721

} else {

1722

int status;

1723

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

1724

perror_plus("waitpid");

1725

free(fullname);

1726

continue;

1727

}

1728

if(WIFEXITED(status)){

1729

if(WEXITSTATUS(status) != 0){

1730

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

1731

"Warning: network hook \"%s\" exited"

1732

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

1733

WEXITSTATUS(status));

1734

free(fullname);

1735

continue;

1736

}

1737

} else if(WIFSIGNALED(status)){

1738

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

1739

"Warning: network hook \"%s\" died by"

1740

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

1741

WTERMSIG(status));

1742

free(fullname);

1743

continue;

1744

} else {

1745

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

1746

"Warning: network hook \"%s\" crashed\n",

1747

direntry->d_name);

1748

free(fullname);

1749

continue;

1750

}

1751

}

1752

free(fullname);

1753

if(quit_now){

1754

goto end;

1755

}

1756

}

1757

close(devnull);

1758

}

1939

1759

}

1940

1760

1941

1761

if(not debug){

1957

1777

/* Pick the first interface returned */

1958

1778

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

1959

1779

if(debug){

1960

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

1780

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

1781

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

1961

1782

}

1962

1783

if(interface == NULL){

1963

1784

perror_plus("malloc");

1968

1789

free(direntries);

1969

1790

} else {

1970

1791

free(direntries);

1971

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

1792

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

1793

"Could not find a network interface\n");

1972

1794

exitcode = EXIT_FAILURE;

1973

1795

goto end;

1974

1796

}

1980

1802

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

1981

1803

mc.simple_poll = avahi_simple_poll_new();

1982

1804

if(mc.simple_poll == NULL){

1983

fprintf_plus(stderr,

1984

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

1805

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

1806

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

1985

1807

exitcode = EX_UNAVAILABLE;

1986

1808

goto end;

1987

1809

}

2050

1872

}

2051

1873

2052

1874

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

2053

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

2054

ret = bring_up_interface(interface, delay);

2055

if(ret != 0){

2056

errno = ret;

2057

perror_plus("Failed to bring up interface");

1875

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

1876

if_index = (AvahiIfIndex) if_nametoindex(interface);

1877

if(if_index == 0){

1878

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

1879

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

1880

exitcode = EX_UNAVAILABLE;

1881

goto end;

1882

}

1883

1884

if(quit_now){

1885

goto end;

1886

}

1887

1888

/* Re-raise priviliges */

1889

errno = 0;

1890

ret = seteuid(0);

1891

if(ret == -1){

1892

perror_plus("seteuid");

1893

}

1894

1895

#ifdef __linux__

1896

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1897

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

1898

ret = klogctl(8, NULL, 5);

1899

bool restore_loglevel = true;

1900

if(ret == -1){

1901

restore_loglevel = false;

1902

perror_plus("klogctl");

1903

}

1904

#endif /* __linux__ */

1905

1906

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1907

if(sd < 0){

1908

perror_plus("socket");

1909

exitcode = EX_OSERR;

1910

#ifdef __linux__

1911

if(restore_loglevel){

1912

ret = klogctl(7, NULL, 0);

1913

if(ret == -1){

1914

perror_plus("klogctl");

1915

}

1916

}

1917

#endif /* __linux__ */

1918

/* Lower privileges */

1919

errno = 0;

1920

ret = seteuid(uid);

1921

if(ret == -1){

1922

perror_plus("seteuid");

1923

}

1924

goto end;

1925

}

1926

strcpy(network.ifr_name, interface);

1927

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

1928

if(ret == -1){

1929

perror_plus("ioctl SIOCGIFFLAGS");

1930

#ifdef __linux__

1931

if(restore_loglevel){

1932

ret = klogctl(7, NULL, 0);

1933

if(ret == -1){

1934

perror_plus("klogctl");

1935

}

1936

}

1937

#endif /* __linux__ */

1938

exitcode = EX_OSERR;

1939

/* Lower privileges */

1940

errno = 0;

1941

ret = seteuid(uid);

1942

if(ret == -1){

1943

perror_plus("seteuid");

1944

}

1945

goto end;

1946

}

1947

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

1948

network.ifr_flags |= IFF_UP;

1949

take_down_interface = true;

1950

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

1951

if(ret == -1){

1952

take_down_interface = false;

1953

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1954

exitcode = EX_OSERR;

1955

#ifdef __linux__

1956

if(restore_loglevel){

1957

ret = klogctl(7, NULL, 0);

1958

if(ret == -1){

1959

perror_plus("klogctl");

1960

}

1961

}

1962

#endif /* __linux__ */

1963

/* Lower privileges */

1964

errno = 0;

1965

ret = seteuid(uid);

1966

if(ret == -1){

1967

perror_plus("seteuid");

1968

}

1969

goto end;

1970

}

1971

}

1972

/* Sleep checking until interface is running.

1973

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

1974

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

1975

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

1976

if(ret == -1){

1977

perror_plus("ioctl SIOCGIFFLAGS");

1978

} else if(network.ifr_flags & IFF_RUNNING){

1979

break;

1980

}

1981

struct timespec sleeptime = { .tv_nsec = 250000000 };

1982

ret = nanosleep(&sleeptime, NULL);

1983

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

1984

perror_plus("nanosleep");

1985

}

1986

}

1987

if(not take_down_interface){

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("close");

1992

}

1993

}

1994

#ifdef __linux__

1995

if(restore_loglevel){

1996

/* Restores kernel loglevel to default */

1997

ret = klogctl(7, NULL, 0);

1998

if(ret == -1){

1999

perror_plus("klogctl");

2000

}

2001

}

2002

#endif /* __linux__ */

2003

/* Lower privileges */

2004

errno = 0;

2005

if(take_down_interface){

2006

/* Lower privileges */

2007

ret = seteuid(uid);

2008

if(ret == -1){

2009

perror_plus("seteuid");

2010

}

2011

} else {

2012

/* Lower privileges permanently */

2013

ret = setuid(uid);

2014

if(ret == -1){

2015

perror_plus("setuid");

2016

}

2058

2017

}

2059

2018

}

2060

2019

2064

2023

2065

2024

ret = init_gnutls_global(pubkey, seckey);

2066

2025

if(ret == -1){

2067

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

2026

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

2027

"init_gnutls_global failed\n");

2068

2028

exitcode = EX_UNAVAILABLE;

2069

2029

goto end;

2070

2030

} else {

2086

2046

}

2087

2047

2088

2048

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

2089

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

2049

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

2050

"init_gpgme failed\n");

2090

2051

exitcode = EX_UNAVAILABLE;

2091

2052

goto end;

2092

2053

} else {

2101

2062

/* Connect directly, do not use Zeroconf */

2102

2063

/* (Mainly meant for debugging) */

2103

2064

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

2104

2105

2065

if(address == NULL){

2106

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

2066

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

2067

"No colon in address\n");

2107

2068

exitcode = EX_USAGE;

2108

2069

goto end;

2109

2070

}

2117

2078

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

2118

2079

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

2119

2080

or tmpmax != (uint16_t)tmpmax){

2120

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

2081

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

2082

"Bad port number\n");

2121

2083

exitcode = EX_USAGE;

2122

2084

goto end;

2123

2085

}

2153

2115

break;

2154

2116

}

2155

2117

if(debug){

2156

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

2157

(int)retry_interval);

2118

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

2119

"Retrying in %d seconds\n", (int)retry_interval);

2158

2120

}

2159

2121

sleep((int)retry_interval);

2160

2122

}

2190

2152

2191

2153

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

2192

2154

if(mc.server == NULL){

2193

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

2194

avahi_strerror(error));

2155

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

2156

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

2157

avahi_strerror(error));

2195

2158

exitcode = EX_UNAVAILABLE;

2196

2159

goto end;

2197

2160

}

2205

2168

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2206

2169

NULL, 0, browse_callback, NULL);

2207

2170

if(sb == NULL){

2208

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

2209

avahi_strerror(avahi_server_errno(mc.server)));

2171

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

2172

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

2173

avahi_strerror(avahi_server_errno(mc.server)));

2210

2174

exitcode = EX_UNAVAILABLE;

2211

2175

goto end;

2212

2176

}

2218

2182

/* Run the main loop */

2219

2183

2220

2184

if(debug){

2221

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

2185

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

2186

"Starting Avahi loop search\n");

2222

2187

}

2223

2188

2224

2189

ret = avahi_loop_with_timeout(mc.simple_poll,

2225

2190

(int)(retry_interval * 1000));

2226

2191

if(debug){

2227

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

2228

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

2192

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

2193

"avahi_loop_with_timeout exited %s\n",

2194

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

2229

2195

}

2230

2196

2231

2197

end:

2232

2198

2233

2199

if(debug){

2234

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

2200

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

2201

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

2235

2202

}

2236

2203

2237

2204

/* Cleanup things */

2253

2220

if(gpgme_initialized){

2254

2221

gpgme_release(mc.ctx);

2255

2222

}

2256

2223

2257

2224

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

2258

2225

has seen */

2259

2226

if(mc.current_server != NULL){

2265

2232

}

2266

2233

}

2267

2234

2268

/* Run network hooks */

2269

run_network_hooks("stop", interface, delay);

2235

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

2270

2236

2271

/* Re-raise priviliges */

2272

{

2273

raise_privileges();

2274

2275

/* Take down the network interface */

2276

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

2237

/* Take down the network interface */

2238

if(take_down_interface){

2239

/* Re-raise priviliges */

2240

errno = 0;

2241

ret = seteuid(0);

2242

if(ret == -1){

2243

perror_plus("seteuid");

2244

}

2245

if(geteuid() == 0){

2277

2246

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

2278

2247

if(ret == -1){

2279

2248

perror_plus("ioctl SIOCGIFFLAGS");

2288

2257

if(ret == -1){

2289

2258

perror_plus("close");

2290

2259

}

2260

/* Lower privileges permanently */

2261

errno = 0;

2262

ret = setuid(uid);

2263

if(ret == -1){

2264

perror_plus("setuid");

2265

}

2291

2266

}

2292

2267

}

2293

/* Lower privileges permanently */

2294

errno = 0;

2295

ret = setuid(uid);

2296

if(ret == -1){

2297

perror_plus("setuid");

2298

}

2299

2268

2300

2269

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

2301

2270

if(tempdir_created){

2315

2284

}

2316

2285

ret = remove(fullname);

2317

2286

if(ret == -1){

2318

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

2319

strerror(errno));

2287

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

2288

"remove(\"%s\"): %s\n", fullname, strerror(errno));

2320

2289

}

2321

2290

free(fullname);

2322

2291

}