/mandos/trunk : revision 505.3.5

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

41

42

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

43

stdout, ferror(), remove() */

44

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

44

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

45

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

46

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

47

strtof(), abort() */

73

*/

74

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

75

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

76

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

76

setgid(), pause() */

77

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

78

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

79

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

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

91

90

92

91

#ifdef __linux__

93

92

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

111

110

init_gnutls_session(),

112

111

GNUTLS_* */

113

112

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

116

115

117

116

/* GPGME */

118

117

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

170

169

171

170

/* Function to use when printing errors */

172

171

void perror_plus(const char *print_text){

173

int e = errno;

174

172

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

175

173

program_invocation_short_name);

176

errno = e;

177

174

perror(print_text);

178

175

}

179

176

180

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

181

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

182

va_list ap;

183

va_start (ap, format);

184

185

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

186

program_invocation_short_name));

187

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

188

}

189

190

177

/*

191

178

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

192

179

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

193

180

* "buffer_length" is how much is already used.

194

181

*/

195

182

size_t incbuffer(char **buffer, size_t buffer_length,

196

size_t buffer_capacity){

183

size_t buffer_capacity){

197

184

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

185

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

199

186

if(buffer == NULL){

205

192

}

206

193

207

194

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

208

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

209

int af){

195

int add_server(const char *ip, uint16_t port,

196

AvahiIfIndex if_index,

197

int af){

210

198

int ret;

211

199

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

212

200

if(new_server == NULL){

213

201

perror_plus("malloc");

214

return false;

202

return -1;

215

203

}

216

204

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

217

.port = port,

218

.if_index = if_index,

219

.af = af };

205

.port = port,

206

.if_index = if_index,

207

.af = af };

220

208

if(new_server->ip == NULL){

221

209

perror_plus("strdup");

222

return false;

210

return -1;

223

211

}

224

212

/* Special case of first server */

225

213

if (mc.current_server == NULL){

236

224

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

237

225

if(ret == -1){

238

226

perror_plus("clock_gettime");

239

return false;

227

return -1;

240

228

}

241

return true;

229

return 0;

242

230

}

243

231

244

232

/*

245

233

* Initialize GPGME.

246

234

*/

247

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

248

const char *tempdir){

235

static bool init_gpgme(const char *seckey,

236

const char *pubkey, const char *tempdir){

249

237

gpgme_error_t rc;

250

238

gpgme_engine_info_t engine_info;

251

239

266

254

267

255

rc = gpgme_data_new_from_fd(&pgp_data, fd);

268

256

if(rc != GPG_ERR_NO_ERROR){

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

257

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

258

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

259

gpgme_strsource(rc), gpgme_strerror(rc));

271

260

return false;

272

261

}

273

262

274

263

rc = gpgme_op_import(mc.ctx, pgp_data);

275

264

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

265

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

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

278

268

return false;

279

269

}

280

270

287

277

}

288

278

289

279

if(debug){

290

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

280

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

281

"Initializing GPGME\n");

291

282

}

292

283

293

284

/* Init GPGME */

294

285

gpgme_check_version(NULL);

295

286

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

296

287

if(rc != GPG_ERR_NO_ERROR){

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

288

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

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

299

291

return false;

300

292

}

301

293

302

294

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

303

295

rc = gpgme_get_engine_info(&engine_info);

304

296

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

297

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

298

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

299

gpgme_strsource(rc), gpgme_strerror(rc));

307

300

return false;

308

301

}

309

302

while(engine_info != NULL){

315

308

engine_info = engine_info->next;

316

309

}

317

310

if(engine_info == NULL){

318

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

319

tempdir);

311

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

312

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

320

313

return false;

321

314

}

322

315

323

316

/* Create new GPGME "context" */

324

317

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

325

318

if(rc != GPG_ERR_NO_ERROR){

326

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

327

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

328

gpgme_strerror(rc));

319

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

320

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

321

gpgme_strerror(rc));

329

322

return false;

330

323

}

331

324

350

343

ssize_t plaintext_length = 0;

351

344

352

345

if(debug){

353

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

346

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

347

"Trying to decrypt OpenPGP data\n");

354

348

}

355

349

356

350

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

357

351

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

358

352

0);

359

353

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

354

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

355

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

356

gpgme_strsource(rc), gpgme_strerror(rc));

362

357

return -1;

363

358

}

364

359

365

360

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

366

361

rc = gpgme_data_new(&dh_plain);

367

362

if(rc != GPG_ERR_NO_ERROR){

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

363

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

364

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

365

gpgme_strsource(rc), gpgme_strerror(rc));

371

366

gpgme_data_release(dh_crypto);

372

367

return -1;

373

368

}

376

371

data buffer */

377

372

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

378

373

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

374

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

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

381

377

plaintext_length = -1;

382

378

if(debug){

383

379

gpgme_decrypt_result_t result;

384

380

result = gpgme_op_decrypt_result(mc.ctx);

385

381

if(result == NULL){

386

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

382

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

383

"gpgme_op_decrypt_result failed\n");

387

384

} else {

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

385

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

386

"Unsupported algorithm: %s\n",

387

result->unsupported_algorithm);

388

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

389

"Wrong key usage: %u\n",

390

result->wrong_key_usage);

392

391

if(result->file_name != NULL){

393

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

392

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

393

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

394

}

395

gpgme_recipient_t recipient;

396

recipient = result->recipients;

397

while(recipient != NULL){

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");

398

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

399

"Public key algorithm: %s\n",

400

gpgme_pubkey_algo_name(recipient->pubkey_algo));

401

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

402

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

403

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

404

"Secret key available: %s\n",

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "No" : "Yes");

405

407

recipient = recipient->next;

406

408

}

407

409

}

410

412

}

411

413

412

414

if(debug){

413

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

415

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

416

"Decryption of OpenPGP data succeeded\n");

414

417

}

415

418

416

419

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

423

426

*plaintext = NULL;

424

427

while(true){

425

428

plaintext_capacity = incbuffer(plaintext,

426

(size_t)plaintext_length,

427

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

428

431

if(plaintext_capacity == 0){

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

432

435

}

433

436

434

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

447

450

}

448

451

449

452

if(debug){

450

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

453

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

454

"Decrypted password is: ");

451

455

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

452

456

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

453

457

}

475

479

/* GnuTLS log function callback */

476

480

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

477

481

const char* string){

478

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

482

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

479

483

}

480

484

481

485

static int init_gnutls_global(const char *pubkeyfilename,

483

487

int ret;

484

488

485

489

if(debug){

486

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

490

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

491

"Initializing GnuTLS\n");

487

492

}

488

493

489

494

ret = gnutls_global_init();

490

495

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

496

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

497

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

493

498

return -1;

494

499

}

495

500

504

509

/* OpenPGP credentials */

505

510

ret = gnutls_certificate_allocate_credentials(&mc.cred);

506

511

if(ret != GNUTLS_E_SUCCESS){

507

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

508

safer_gnutls_strerror(ret));

512

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

513

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

509

514

gnutls_global_deinit();

510

515

return -1;

511

516

}

512

517

513

518

if(debug){

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

519

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

520

"Attempting to use OpenPGP public key %s and"

521

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

522

seckeyfilename);

518

523

}

519

524

520

525

ret = gnutls_certificate_set_openpgp_key_file

521

526

(mc.cred, pubkeyfilename, seckeyfilename,

522

527

GNUTLS_OPENPGP_FMT_BASE64);

523

528

if(ret != GNUTLS_E_SUCCESS){

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));

529

fprintf(stderr,

530

"Mandos plugin mandos-client: "

531

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

532

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

533

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

534

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

529

535

goto globalfail;

530

536

}

531

537

532

538

/* GnuTLS server initialization */

533

539

ret = gnutls_dh_params_init(&mc.dh_params);

534

540

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

541

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

542

"Error in GnuTLS DH parameter initialization:"

543

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

538

544

goto globalfail;

539

545

}

540

546

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

541

547

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

548

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

549

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

550

safer_gnutls_strerror(ret));

544

551

goto globalfail;

545

552

}

546

553

566

573

}

567

574

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

568

575

if(ret != GNUTLS_E_SUCCESS){

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

576

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

577

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

578

safer_gnutls_strerror(ret));

572

579

}

573

580

574

581

{

581

588

}

582

589

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

583

590

if(ret != GNUTLS_E_SUCCESS){

584

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

585

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

586

safer_gnutls_strerror(ret));

591

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

592

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

593

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

594

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

587

595

gnutls_deinit(*session);

588

596

return -1;

589

597

}

598

606

}

599

607

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

600

608

if(ret != GNUTLS_E_SUCCESS){

601

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

602

safer_gnutls_strerror(ret));

609

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

610

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

611

safer_gnutls_strerror(ret));

603

612

gnutls_deinit(*session);

604

613

return -1;

605

614

}

650

659

pf = PF_INET;

651

660

break;

652

661

default:

653

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

662

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

663

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

654

664

errno = EINVAL;

655

665

return -1;

656

666

}

661

671

}

662

672

663

673

if(debug){

664

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

665

PRIu16 "\n", ip, port);

674

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

675

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

676

"\n", ip, port);

666

677

}

667

678

668

679

tcp_sd = socket(pf, SOCK_STREAM, 0);

694

705

}

695

706

if(ret == 0){

696

707

int e = errno;

697

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

708

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

709

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

698

710

errno = e;

699

711

goto mandos_end;

700

712

}

705

717

706

718

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

719

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

708

-Wunreachable-code*/

720

-Wunreachable-code*/

709

721

if(if_index == AVAHI_IF_UNSPEC){

710

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

711

" incomplete without a network interface\n");

722

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

723

"An IPv6 link-local address is incomplete"

724

" without a network interface\n");

712

725

errno = EINVAL;

713

726

goto mandos_end;

714

727

}

732

745

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

733

746

perror_plus("if_indextoname");

734

747

} else {

735

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

736

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

748

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

749

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

750

ip, interface, port);

737

751

}

738

752

} else {

739

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

740

ip, port);

753

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

754

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

741

755

}

742

756

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

757

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

753

767

perror_plus("inet_ntop");

754

768

} else {

755

769

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

756

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

770

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

771

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

757

772

}

758

773

}

759

774

}

787

802

while(true){

788

803

size_t out_size = strlen(out);

789

804

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

790

out_size - written));

805

out_size - written));

791

806

if(ret == -1){

792

807

int e = errno;

793

808

perror_plus("write");

813

828

}

814

829

815

830

if(debug){

816

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

831

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

832

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

817

833

}

818

834

819

835

if(quit_now){

821

837

goto mandos_end;

822

838

}

823

839

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);

840

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

841

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

829

842

830

843

if(quit_now){

831

844

errno = EINTR;

842

855

843

856

if(ret != GNUTLS_E_SUCCESS){

844

857

if(debug){

845

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

858

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

859

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

846

860

gnutls_perror(ret);

847

861

}

848

862

errno = EPROTO;

852

866

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

853

867

854

868

if(debug){

855

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

856

" %s\n", ip);

869

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

870

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

857

871

}

858

872

859

873

while(true){

864

878

}

865

879

866

880

buffer_capacity = incbuffer(&buffer, buffer_length,

867

buffer_capacity);

881

buffer_capacity);

868

882

if(buffer_capacity == 0){

869

883

int e = errno;

870

884

perror_plus("incbuffer");

897

911

}

898

912

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

899

913

if(ret < 0){

900

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

901

"***\n");

914

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

915

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

902

916

gnutls_perror(ret);

903

917

errno = EPROTO;

904

918

goto mandos_end;

905

919

}

906

920

break;

907

921

default:

908

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

909

" encrypted session with Mandos server\n");

922

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

923

"Unknown error while reading data from"

924

" encrypted session with Mandos server\n");

910

925

gnutls_bye(session, GNUTLS_SHUT_RDWR);

911

926

errno = EIO;

912

927

goto mandos_end;

917

932

}

918

933

919

934

if(debug){

920

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

935

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

936

"Closing TLS session\n");

921

937

}

922

938

923

939

if(quit_now){

935

951

936

952

if(buffer_length > 0){

937

953

ssize_t decrypted_buffer_size;

938

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

954

decrypted_buffer_size = pgp_packet_decrypt(buffer,

955

buffer_length,

939

956

&decrypted_buffer);

940

957

if(decrypted_buffer_size >= 0){

941

958

952

969

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

953

970

int e = errno;

954

971

if(debug){

955

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

956

strerror(errno));

972

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

973

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

974

strerror(errno));

957

975

}

958

976

errno = e;

959

977

goto mandos_end;

1016

1034

switch(event){

1017

1035

default:

1018

1036

case AVAHI_RESOLVER_FAILURE:

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)));

1037

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

1038

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

1039

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

1040

avahi_strerror(avahi_server_errno(mc.server)));

1023

1041

break;

1024

1042

1025

1043

case AVAHI_RESOLVER_FOUND:

1027

1045

char ip[AVAHI_ADDRESS_STR_MAX];

1028

1046

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

1029

1047

if(debug){

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);

1048

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

1049

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

1050

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

1051

ip, (intmax_t)interface, port);

1033

1052

}

1034

1053

int ret = start_mandos_communication(ip, port, interface,

1035

1054

avahi_proto_to_af(proto));

1036

1055

if(ret == 0){

1037

1056

avahi_simple_poll_quit(mc.simple_poll);

1038

1057

} else {

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

}

1058

ret = add_server(ip, port, interface,

1059

avahi_proto_to_af(proto));

1044

1060

}

1045

1061

}

1046

1062

}

1070

1086

default:

1071

1087

case AVAHI_BROWSER_FAILURE:

1072

1088

1073

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

1074

avahi_strerror(avahi_server_errno(mc.server)));

1089

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

1090

"(Avahi browser) %s\n",

1091

avahi_strerror(avahi_server_errno(mc.server)));

1075

1092

avahi_simple_poll_quit(mc.simple_poll);

1076

1093

return;

1077

1094

1084

1101

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

1085

1102

name, type, domain, protocol, 0,

1086

1103

resolve_callback, NULL) == NULL)

1087

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

1088

" %s\n", name,

1089

avahi_strerror(avahi_server_errno(mc.server)));

1104

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

1105

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

1106

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

1090

1107

break;

1091

1108

1092

1109

case AVAHI_BROWSER_REMOVE:

1095

1112

case AVAHI_BROWSER_ALL_FOR_NOW:

1096

1113

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1097

1114

if(debug){

1098

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

1099

" searching...\n");

1115

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

1116

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

1100

1117

}

1101

1118

break;

1102

1119

}

1141

1158

/* Reject the loopback device */

1142

1159

if(ifr->ifr_flags & IFF_LOOPBACK){

1143

1160

if(debug){

1144

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

1145

ifname);

1161

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

1162

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

1146

1163

}

1147

1164

return false;

1148

1165

}

1149

1166

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

1150

1167

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

1151

1168

if(debug){

1152

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

1153

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

1169

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

1170

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

1154

1171

}

1155

1172

return true;

1156

1173

}

1157

1174

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

1158

1175

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

1159

1176

if(debug){

1160

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1161

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

1177

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

1178

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

1162

1179

}

1163

1180

return false;

1164

1181

}

1165

1182

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

1166

1183

if(ifr->ifr_flags & IFF_NOARP){

1167

1184

if(debug){

1168

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

1169

ifname);

1185

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

1186

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

1170

1187

}

1171

1188

return false;

1172

1189

}

1173

1190

1174

1191

/* Accept this device */

1175

1192

if(debug){

1176

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

1193

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

1194

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

1177

1195

}

1178

1196

return true;

1179

1197

}

1191

1209

struct ifreq ifr;

1192

1210

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

1193

1211

if(debug){

1194

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

1195

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

1212

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

1213

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

1214

if_entry->d_name);

1196

1215

}

1197

1216

return 0;

1198

1217

}

1216

1235

struct ifreq ifr;

1217

1236

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

1218

1237

if(debug){

1219

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

1220

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

1238

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

1239

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

1240

if_entry->d_name);

1221

1241

}

1222

1242

return 0;

1223

1243

}

1225

1245

/* Reject down interfaces */

1226

1246

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

1227

1247

if(debug){

1228

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

1229

if_entry->d_name);

1248

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

1249

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

1250

if_entry->d_name);

1230

1251

}

1231

1252

return 0;

1232

1253

}

1234

1255

/* Reject non-running interfaces */

1235

1256

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

1236

1257

if(debug){

1237

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

1238

if_entry->d_name);

1258

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

1259

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

1260

if_entry->d_name);

1239

1261

}

1240

1262

return 0;

1241

1263

}

1260

1282

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

1261

1283

int runnable_hook(const struct dirent *direntry){

1262

1284

int ret;

1263

size_t sret;

1264

1285

struct stat st;

1265

1286

1266

1287

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

1268

1289

return 0;

1269

1290

}

1270

1291

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

}

1292

/* Save pointer to last character */

1293

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

1294

1295

if(*end == '~'){

1296

/* Backup name~ */

1297

return 0;

1298

}

1299

1300

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

1301

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

1302

/* Temporary #name# */

1303

return 0;

1304

}

1305

1306

/* XXX more rules here */

1283

1307

1284

1308

char *fullname = NULL;

1285

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

1309

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

1310

direntry->d_name);

1286

1311

if(ret < 0){

1287

1312

perror_plus("asprintf");

1288

1313

return 0;

1291

1316

ret = stat(fullname, &st);

1292

1317

if(ret == -1){

1293

1318

if(debug){

1294

perror_plus("Could not stat hook");

1319

perror_plus("Could not stat plugin");

1295

1320

}

1296

1321

return 0;

1297

1322

}

1298

1323

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

1299

1324

/* Not a regular file */

1300

if(debug){

1301

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

1302

direntry->d_name);

1303

}

1304

1325

return 0;

1305

1326

}

1306

1327

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

1307

1328

/* Not executable */

1308

if(debug){

1309

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

1310

direntry->d_name);

1311

}

1312

1329

return 0;

1313

1330

}

1314

if(debug){

1315

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

1316

direntry->d_name);

1317

}

1318

1331

return 1;

1319

1332

}

1320

1333

1327

1340

while(true){

1328

1341

if(mc.current_server == NULL){

1329

1342

if (debug){

1330

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

1331

" No timeout!\n");

1343

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

1344

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

1332

1345

}

1333

1346

ret = avahi_simple_poll_iterate(s, -1);

1334

1347

} else {

1335

1348

if (debug){

1336

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

1337

" it, or wait\n");

1349

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

1350

"Check current_server if we should run it,"

1351

" or wait\n");

1338

1352

}

1339

1353

/* the current time */

1340

1354

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1356

1370

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

1357

1371

1358

1372

if (debug){

1359

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

1360

block_time);

1373

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

1374

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

1361

1375

}

1362

1376

1363

1377

if(block_time <= 0){

1390

1404

}

1391

1405

}

1392

1406

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

1529

1407

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

1530

1408

AvahiSServiceBrowser *sb = NULL;

1531

1409

int error;

1611

1489

.group = 2 },

1612

1490

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

1613

1491

.arg = "SECONDS",

1614

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

1492

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

1615

1493

.group = 2 },

1616

1494

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

1617

1495

.arg = "DIR",

1689

1567

argp_state_help(state, state->out_stream,

1690

1568

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1691

1569

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

1692

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

1570

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

1571

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

1693

1572

exit(argp_err_exit_status);

1694

1573

break;

1695

1574

default:

1722

1601

{

1723

1602

/* Work around Debian bug #633582:

1724

1603

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

1604

struct stat st;

1725

1605

1726

1606

/* Re-raise priviliges */

1727

1607

errno = 0;

1728

1608

ret = seteuid(0);

1729

1609

if(ret == -1){

1730

1610

perror_plus("seteuid");

1611

}

1612

1613

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

1614

int seckey_fd = open(seckey, O_RDONLY);

1615

if(seckey_fd == -1){

1616

perror_plus("open");

1617

} else {

1618

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

1619

if(ret == -1){

1620

perror_plus("fstat");

1621

} else {

1622

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

1623

ret = fchown(seckey_fd, uid, gid);

1624

if(ret == -1){

1625

perror_plus("fchown");

1626

}

1627

}

1628

}

1629

TEMP_FAILURE_RETRY(close(seckey_fd));

1630

}

1631

}

1632

1633

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

1634

int pubkey_fd = open(pubkey, O_RDONLY);

1635

if(pubkey_fd == -1){

1636

perror_plus("open");

1637

} else {

1638

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

1639

if(ret == -1){

1640

perror_plus("fstat");

1641

} else {

1642

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

1643

ret = fchown(pubkey_fd, uid, gid);

1644

if(ret == -1){

1645

perror_plus("fchown");

1646

}

1647

}

1648

}

1649

TEMP_FAILURE_RETRY(close(pubkey_fd));

1650

}

1651

}

1652

1653

/* Lower privileges */

1654

errno = 0;

1655

ret = seteuid(uid);

1656

if(ret == -1){

1657

perror_plus("seteuid");

1658

}

1659

}

1660

1661

/* Find network hooks and run them */

1662

{

1663

struct dirent **direntries;

1664

struct dirent *direntry;

1665

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

1666

alphasort);

1667

if(numhooks == -1){

1668

perror_plus("scandir");

1731

1669

} 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

}

1670

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

1671

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

1672

direntry = direntries[0];

1673

char *fullname = NULL;

1674

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

1675

if(ret < 0){

1676

perror_plus("asprintf");

1677

continue;

1678

}

1679

pid_t hook_pid = fork();

1680

if(hook_pid == 0){

1681

/* Child */

1682

dup2(devnull, STDIN_FILENO);

1683

close(devnull);

1684

dup2(STDERR_FILENO, STDOUT_FILENO);

1685

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

1686

if(ret == -1){

1687

perror_plus("setenv");

1688

exit(1);

1689

}

1690

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

1691

if(ret == -1){

1692

perror_plus("setenv");

1693

exit(1);

1694

}

1695

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

1696

if(ret == -1){

1697

perror_plus("setenv");

1698

exit(1);

1699

}

1700

char *delaystring;

1701

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

1702

if(ret == -1){

1703

perror_plus("asprintf");

1704

exit(1);

1705

}

1706

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

1707

if(ret == -1){

1708

free(delaystring);

1709

perror_plus("setenv");

1710

exit(1);

1711

}

1712

free(delaystring);

1713

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

1714

perror_plus("execl");

1715

} else {

1716

int status;

1717

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

1718

perror_plus("waitpid");

1719

free(fullname);

1720

continue;

1721

}

1722

if(WIFEXITED(status)){

1723

if(WEXITSTATUS(status) != 0){

1724

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

1725

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

1726

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

1727

WEXITSTATUS(status));

1728

free(fullname);

1729

continue;

1730

}

1731

} else if(WIFSIGNALED(status)){

1732

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

1733

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

1734

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

1735

WTERMSIG(status));

1736

free(fullname);

1737

continue;

1738

} else {

1739

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

1740

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

1741

direntry->d_name);

1742

free(fullname);

1743

continue;

1744

}

1745

}

1746

free(fullname);

1747

if(quit_now){

1748

goto end;

1749

}

1750

}

1751

close(devnull);

1782

1752

}

1783

1753

}

1784

1754

1785

/* Run network hooks */

1786

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

1787

goto end;

1788

}

1789

1790

1755

if(not debug){

1791

1756

avahi_set_log_function(empty_log);

1792

1757

}

1806

1771

/* Pick the first interface returned */

1807

1772

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

1808

1773

if(debug){

1809

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

1774

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

1775

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

1810

1776

}

1811

1777

if(interface == NULL){

1812

1778

perror_plus("malloc");

1817

1783

free(direntries);

1818

1784

} else {

1819

1785

free(direntries);

1820

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

1786

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

1787

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

1821

1788

exitcode = EXIT_FAILURE;

1822

1789

goto end;

1823

1790

}

1829

1796

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

1830

1797

mc.simple_poll = avahi_simple_poll_new();

1831

1798

if(mc.simple_poll == NULL){

1832

fprintf_plus(stderr,

1833

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

1799

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

1800

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

1834

1801

exitcode = EX_UNAVAILABLE;

1835

1802

goto end;

1836

1803

}

1902

1869

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

1903

1870

if_index = (AvahiIfIndex) if_nametoindex(interface);

1904

1871

if(if_index == 0){

1905

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

1872

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

1873

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

1906

1874

exitcode = EX_UNAVAILABLE;

1907

1875

goto end;

1908

1876

}

2028

1996

#endif /* __linux__ */

2029

1997

/* Lower privileges */

2030

1998

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

1999

if(take_down_interface){

2000

/* Lower privileges */

2001

ret = seteuid(uid);

2002

if(ret == -1){

2003

perror_plus("seteuid");

2004

}

2005

} else {

2006

/* Lower privileges permanently */

2007

ret = setuid(uid);

2008

if(ret == -1){

2009

perror_plus("setuid");

2010

}

2035

2011

}

2036

2012

}

2037

2013

2041

2017

2042

2018

ret = init_gnutls_global(pubkey, seckey);

2043

2019

if(ret == -1){

2044

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

2020

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

2021

"init_gnutls_global failed\n");

2045

2022

exitcode = EX_UNAVAILABLE;

2046

2023

goto end;

2047

2024

} else {

2063

2040

}

2064

2041

2065

2042

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

2066

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

2043

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

2044

"init_gpgme failed\n");

2067

2045

exitcode = EX_UNAVAILABLE;

2068

2046

goto end;

2069

2047

} else {

2079

2057

/* (Mainly meant for debugging) */

2080

2058

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

2081

2059

if(address == NULL){

2082

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

2060

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

2061

"No colon in address\n");

2083

2062

exitcode = EX_USAGE;

2084

2063

goto end;

2085

2064

}

2093

2072

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

2094

2073

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

2095

2074

or tmpmax != (uint16_t)tmpmax){

2096

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

2075

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

2076

"Bad port number\n");

2097

2077

exitcode = EX_USAGE;

2098

2078

goto end;

2099

2079

}

2129

2109

break;

2130

2110

}

2131

2111

if(debug){

2132

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

2133

(int)retry_interval);

2112

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

2113

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

2134

2114

}

2135

2115

sleep((int)retry_interval);

2136

2116

}

2166

2146

2167

2147

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

2168

2148

if(mc.server == NULL){

2169

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

2170

avahi_strerror(error));

2149

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

2150

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

2151

avahi_strerror(error));

2171

2152

exitcode = EX_UNAVAILABLE;

2172

2153

goto end;

2173

2154

}

2181

2162

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2182

2163

NULL, 0, browse_callback, NULL);

2183

2164

if(sb == NULL){

2184

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

2185

avahi_strerror(avahi_server_errno(mc.server)));

2165

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

2166

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

2167

avahi_strerror(avahi_server_errno(mc.server)));

2186

2168

exitcode = EX_UNAVAILABLE;

2187

2169

goto end;

2188

2170

}

2194

2176

/* Run the main loop */

2195

2177

2196

2178

if(debug){

2197

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

2179

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

2180

"Starting Avahi loop search\n");

2198

2181

}

2199

2182

2200

2183

ret = avahi_loop_with_timeout(mc.simple_poll,

2201

2184

(int)(retry_interval * 1000));

2202

2185

if(debug){

2203

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

2204

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

2186

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

2187

"avahi_loop_with_timeout exited %s\n",

2188

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

2205

2189

}

2206

2190

2207

2191

end:

2208

2192

2209

2193

if(debug){

2210

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

2194

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

2195

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

2211

2196

}

2212

2197

2213

2198

/* Cleanup things */

2229

2214

if(gpgme_initialized){

2230

2215

gpgme_release(mc.ctx);

2231

2216

}

2232

2217

2233

2218

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

2234

2219

has seen */

2235

2220

if(mc.current_server != NULL){

2241

2226

}

2242

2227

}

2243

2228

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2229

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

2246

2230

2247

/* Re-raise priviliges */

2248

{

2231

/* Take down the network interface */

2232

if(take_down_interface){

2233

/* Re-raise priviliges */

2249

2234

errno = 0;

2250

2235

ret = seteuid(0);

2251

2236

if(ret == -1){

2252

2237

perror_plus("seteuid");

2253

2238

}

2254

2255

/* Take down the network interface */

2256

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

2239

if(geteuid() == 0){

2257

2240

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

2258

2241

if(ret == -1){

2259

2242

perror_plus("ioctl SIOCGIFFLAGS");

2268

2251

if(ret == -1){

2269

2252

perror_plus("close");

2270

2253

}

2254

/* Lower privileges permanently */

2255

errno = 0;

2256

ret = setuid(uid);

2257

if(ret == -1){

2258

perror_plus("setuid");

2259

}

2271

2260

}

2272

2261

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2279

2262

2280

2263

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

2281

2264

if(tempdir_created){

2295

2278

}

2296

2279

ret = remove(fullname);

2297

2280

if(ret == -1){

2298

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

2299

strerror(errno));

2281

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

2282

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

2300

2283

}

2301

2284

free(fullname);

2302

2285

}