/mandos/release : revision 237.16.3

9

* "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

73

*/

74

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

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

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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

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

90

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

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90

92

91

#ifdef __linux__

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92

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

111

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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 */

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115

117

116

/* GPGME */

118

117

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

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133

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

135

134

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

136

135

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

136

139

137

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

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138

typedef struct server{

170

168

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169

/* Function to use when printing errors */

172

170

void perror_plus(const char *print_text){

173

int e = errno;

174

171

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

175

172

program_invocation_short_name);

176

errno = e;

177

173

perror(print_text);

178

174

}

179

175

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

176

/*

191

177

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

192

178

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

193

179

* "buffer_length" is how much is already used.

194

180

*/

195

181

size_t incbuffer(char **buffer, size_t buffer_length,

196

size_t buffer_capacity){

182

size_t buffer_capacity){

197

183

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

184

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

199

185

if(buffer == NULL){

205

191

}

206

192

207

193

/* 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){

194

int add_server(const char *ip, uint16_t port,

195

AvahiIfIndex if_index,

196

int af){

210

197

int ret;

211

198

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

212

199

if(new_server == NULL){

213

200

perror_plus("malloc");

214

return false;

201

return -1;

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202

}

216

203

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

217

.port = port,

218

.if_index = if_index,

219

.af = af };

204

.port = port,

205

.if_index = if_index,

206

.af = af };

220

207

if(new_server->ip == NULL){

221

208

perror_plus("strdup");

222

return false;

209

return -1;

223

210

}

224

211

/* Special case of first server */

225

212

if (mc.current_server == NULL){

236

223

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

237

224

if(ret == -1){

238

225

perror_plus("clock_gettime");

239

return false;

226

return -1;

240

227

}

241

return true;

228

return 0;

242

229

}

243

230

244

231

/*

245

232

* Initialize GPGME.

246

233

*/

247

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

248

const char *tempdir){

234

static bool init_gpgme(const char *seckey,

235

const char *pubkey, const char *tempdir){

249

236

gpgme_error_t rc;

250

237

gpgme_engine_info_t engine_info;

251

238

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253

267

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rc = gpgme_data_new_from_fd(&pgp_data, fd);

268

255

if(rc != GPG_ERR_NO_ERROR){

269

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: "

257

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

258

gpgme_strsource(rc), gpgme_strerror(rc));

271

259

return false;

272

260

}

273

261

274

262

rc = gpgme_op_import(mc.ctx, pgp_data);

275

263

if(rc != GPG_ERR_NO_ERROR){

276

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;

279

268

}

280

269

287

276

}

288

277

289

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if(debug){

290

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

279

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

280

"Initializing GPGME\n");

291

281

}

292

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293

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/* Init GPGME */

294

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gpgme_check_version(NULL);

295

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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

296

286

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));

287

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

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

299

290

return false;

300

291

}

301

292

302

293

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

303

294

rc = gpgme_get_engine_info(&engine_info);

304

295

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));

296

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

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

307

299

return false;

308

300

}

309

301

while(engine_info != NULL){

315

307

engine_info = engine_info->next;

316

308

}

317

309

if(engine_info == NULL){

318

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

319

tempdir);

310

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

311

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

320

312

return false;

321

313

}

322

314

323

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/* Create new GPGME "context" */

324

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

325

317

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));

318

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

319

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

320

gpgme_strerror(rc));

329

321

return false;

330

322

}

331

323

350

342

ssize_t plaintext_length = 0;

351

343

352

344

if(debug){

353

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

345

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

346

"Trying to decrypt OpenPGP data\n");

354

347

}

355

348

356

349

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

357

350

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

358

351

0);

359

352

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));

353

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

354

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

355

gpgme_strsource(rc), gpgme_strerror(rc));

362

356

return -1;

363

357

}

364

358

365

359

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

366

360

rc = gpgme_data_new(&dh_plain);

367

361

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));

362

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

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

371

365

gpgme_data_release(dh_crypto);

372

366

return -1;

373

367

}

376

370

data buffer */

377

371

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

378

372

if(rc != GPG_ERR_NO_ERROR){

379

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

380

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));

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376

plaintext_length = -1;

382

377

if(debug){

383

378

gpgme_decrypt_result_t result;

384

379

result = gpgme_op_decrypt_result(mc.ctx);

385

380

if(result == NULL){

386

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

381

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

382

"gpgme_op_decrypt_result failed\n");

387

383

} 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);

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);

392

390

if(result->file_name != NULL){

393

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);

394

393

}

395

394

gpgme_recipient_t recipient;

396

395

recipient = result->recipients;

397

396

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");

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");

405

406

recipient = recipient->next;

406

407

}

407

408

}

410

411

}

411

412

413

if(debug){

413

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

414

416

}

415

417

416

418

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

423

425

*plaintext = NULL;

424

426

while(true){

425

427

plaintext_capacity = incbuffer(plaintext,

426

(size_t)plaintext_length,

427

plaintext_capacity);

428

(size_t)plaintext_length,

429

plaintext_capacity);

428

430

if(plaintext_capacity == 0){

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

432

434

}

433

435

434

436

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

447

449

}

448

450

449

451

if(debug){

450

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

452

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

453

"Decrypted password is: ");

451

454

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

452

455

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

453

456

}

475

478

/* GnuTLS log function callback */

476

479

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

477

480

const char* string){

478

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

481

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

479

482

}

480

483

481

484

static int init_gnutls_global(const char *pubkeyfilename,

483

486

int ret;

484

487

485

488

if(debug){

486

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

489

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

490

"Initializing GnuTLS\n");

487

491

}

488

492

489

493

ret = gnutls_global_init();

490

494

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

495

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

496

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

493

497

return -1;

494

498

}

495

499

504

508

/* OpenPGP credentials */

505

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

506

510

if(ret != GNUTLS_E_SUCCESS){

507

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

508

safer_gnutls_strerror(ret));

511

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

512

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

509

513

gnutls_global_deinit();

510

514

return -1;

511

515

}

512

516

513

517

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);

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);

518

522

}

519

523

520

524

ret = gnutls_certificate_set_openpgp_key_file

521

525

(mc.cred, pubkeyfilename, seckeyfilename,

522

526

GNUTLS_OPENPGP_FMT_BASE64);

523

527

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));

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));

529

534

goto globalfail;

530

535

}

531

536

532

537

/* GnuTLS server initialization */

533

538

ret = gnutls_dh_params_init(&mc.dh_params);

534

539

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

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));

538

543

goto globalfail;

539

544

}

540

545

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

541

546

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

547

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

548

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

549

safer_gnutls_strerror(ret));

544

550

goto globalfail;

545

551

}

546

552

566

572

}

567

573

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

568

574

if(ret != GNUTLS_E_SUCCESS){

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

575

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

576

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

577

safer_gnutls_strerror(ret));

572

578

}

573

579

574

580

{

581

587

}

582

588

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

583

589

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));

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));

587

594

gnutls_deinit(*session);

588

595

return -1;

589

596

}

598

605

}

599

606

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

600

607

if(ret != GNUTLS_E_SUCCESS){

601

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

602

safer_gnutls_strerror(ret));

608

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

609

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

610

safer_gnutls_strerror(ret));

603

611

gnutls_deinit(*session);

604

612

return -1;

605

613

}

650

658

pf = PF_INET;

651

659

break;

652

660

default:

653

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

661

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

662

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

654

663

errno = EINVAL;

655

664

return -1;

656

665

}

661

670

}

662

671

663

672

if(debug){

664

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

665

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);

666

676

}

667

677

668

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

694

704

}

695

705

if(ret == 0){

696

706

int e = errno;

697

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

707

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

708

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

698

709

errno = e;

699

710

goto mandos_end;

700

711

}

705

716

706

717

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

718

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

708

-Wunreachable-code*/

719

-Wunreachable-code*/

709

720

if(if_index == AVAHI_IF_UNSPEC){

710

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

711

" 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");

712

724

errno = EINVAL;

713

725

goto mandos_end;

714

726

}

732

744

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

733

745

perror_plus("if_indextoname");

734

746

} else {

735

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

736

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

747

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

748

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

749

ip, interface, port);

737

750

}

738

751

} else {

739

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

740

ip, port);

752

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

753

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

741

754

}

742

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

753

766

perror_plus("inet_ntop");

754

767

} else {

755

768

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

756

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

769

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

770

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

757

771

}

758

772

}

759

773

}

787

801

while(true){

788

802

size_t out_size = strlen(out);

789

803

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

790

out_size - written));

804

out_size - written));

791

805

if(ret == -1){

792

806

int e = errno;

793

807

perror_plus("write");

813

827

}

814

828

815

829

if(debug){

816

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);

817

832

}

818

833

819

834

if(quit_now){

839

854

840

855

if(ret != GNUTLS_E_SUCCESS){

841

856

if(debug){

842

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

857

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

858

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

843

859

gnutls_perror(ret);

844

860

}

845

861

errno = EPROTO;

849

865

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

850

866

851

867

if(debug){

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

868

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

869

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

854

870

}

855

871

856

872

while(true){

861

877

}

862

878

863

879

buffer_capacity = incbuffer(&buffer, buffer_length,

864

buffer_capacity);

880

buffer_capacity);

865

881

if(buffer_capacity == 0){

866

882

int e = errno;

867

883

perror_plus("incbuffer");

894

910

}

895

911

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

896

912

if(ret < 0){

897

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

898

"***\n");

913

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

914

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

899

915

gnutls_perror(ret);

900

916

errno = EPROTO;

901

917

goto mandos_end;

902

918

}

903

919

break;

904

920

default:

905

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

906

" 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");

907

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

908

925

errno = EIO;

909

926

goto mandos_end;

914

931

}

915

932

916

933

if(debug){

917

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

934

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

935

"Closing TLS session\n");

918

936

}

919

937

920

938

if(quit_now){

932

950

933

951

if(buffer_length > 0){

934

952

ssize_t decrypted_buffer_size;

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

953

decrypted_buffer_size = pgp_packet_decrypt(buffer,

954

buffer_length,

936

955

&decrypted_buffer);

937

956

if(decrypted_buffer_size >= 0){

938

957

949

968

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

950

969

int e = errno;

951

970

if(debug){

952

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

953

strerror(errno));

971

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

972

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

973

strerror(errno));

954

974

}

955

975

errno = e;

956

976

goto mandos_end;

1013

1033

switch(event){

1014

1034

default:

1015

1035

case AVAHI_RESOLVER_FAILURE:

1016

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

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

1036

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

1037

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

1038

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

1039

avahi_strerror(avahi_server_errno(mc.server)));

1020

1040

break;

1021

1041

1022

1042

case AVAHI_RESOLVER_FOUND:

1024

1044

char ip[AVAHI_ADDRESS_STR_MAX];

1025

1045

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

1026

1046

if(debug){

1027

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

1028

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

1029

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

1047

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

1048

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

1049

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

1050

ip, (intmax_t)interface, port);

1030

1051

}

1031

1052

int ret = start_mandos_communication(ip, port, interface,

1032

1053

avahi_proto_to_af(proto));

1033

1054

if(ret == 0){

1034

1055

avahi_simple_poll_quit(mc.simple_poll);

1035

1056

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

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

1039

" list\n", name);

1040

}

1057

ret = add_server(ip, port, interface,

1058

avahi_proto_to_af(proto));

1041

1059

}

1042

1060

}

1043

1061

}

1067

1085

default:

1068

1086

case AVAHI_BROWSER_FAILURE:

1069

1087

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1088

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

1089

"(Avahi browser) %s\n",

1090

avahi_strerror(avahi_server_errno(mc.server)));

1072

1091

avahi_simple_poll_quit(mc.simple_poll);

1073

1092

return;

1074

1093

1081

1100

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

1082

1101

name, type, domain, protocol, 0,

1083

1102

resolve_callback, NULL) == NULL)

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1103

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

1104

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

1105

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

1087

1106

break;

1088

1107

1089

1108

case AVAHI_BROWSER_REMOVE:

1092

1111

case AVAHI_BROWSER_ALL_FOR_NOW:

1093

1112

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1094

1113

if(debug){

1095

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

1096

" searching...\n");

1114

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

1115

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

1097

1116

}

1098

1117

break;

1099

1118

}

1138

1157

/* Reject the loopback device */

1139

1158

if(ifr->ifr_flags & IFF_LOOPBACK){

1140

1159

if(debug){

1141

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

1142

ifname);

1160

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

1161

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

1143

1162

}

1144

1163

return false;

1145

1164

}

1146

1165

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

1147

1166

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

1148

1167

if(debug){

1149

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

1150

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

1168

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

1169

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

1151

1170

}

1152

1171

return true;

1153

1172

}

1154

1173

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

1155

1174

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

1156

1175

if(debug){

1157

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1158

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

1176

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

1177

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

1159

1178

}

1160

1179

return false;

1161

1180

}

1162

1181

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

1163

1182

if(ifr->ifr_flags & IFF_NOARP){

1164

1183

if(debug){

1165

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

1166

ifname);

1184

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

1185

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

1167

1186

}

1168

1187

return false;

1169

1188

}

1170

1189

1171

1190

/* Accept this device */

1172

1191

if(debug){

1173

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

1192

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

1193

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

1174

1194

}

1175

1195

return true;

1176

1196

}

1188

1208

struct ifreq ifr;

1189

1209

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

1190

1210

if(debug){

1191

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

1192

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

1211

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

1212

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

1213

if_entry->d_name);

1193

1214

}

1194

1215

return 0;

1195

1216

}

1213

1234

struct ifreq ifr;

1214

1235

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

1215

1236

if(debug){

1216

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

1217

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

1237

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

1238

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

1239

if_entry->d_name);

1218

1240

}

1219

1241

return 0;

1220

1242

}

1222

1244

/* Reject down interfaces */

1223

1245

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

1224

1246

if(debug){

1225

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

1226

if_entry->d_name);

1247

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

1248

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

1249

if_entry->d_name);

1227

1250

}

1228

1251

return 0;

1229

1252

}

1231

1254

/* Reject non-running interfaces */

1232

1255

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

1233

1256

if(debug){

1234

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

1235

if_entry->d_name);

1257

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

1258

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

1259

if_entry->d_name);

1236

1260

}

1237

1261

return 0;

1238

1262

}

1257

1281

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

1258

1282

int runnable_hook(const struct dirent *direntry){

1259

1283

int ret;

1260

size_t sret;

1261

1284

struct stat st;

1262

1285

1263

1286

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

1265

1288

return 0;

1266

1289

}

1267

1290

1268

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

1269

"abcdefghijklmnopqrstuvwxyz"

1270

"0123456789"

1271

"_-");

1272

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

1273

/* Contains non-allowed characters */

1274

if(debug){

1275

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

1276

direntry->d_name);

1277

}

1278

return 0;

1279

}

1280

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1291

/* Save pointer to last character */

1292

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

1293

1294

if(*end == '~'){

1295

/* Backup name~ */

1296

return 0;

1297

}

1298

1299

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

1300

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

1301

/* Temporary #name# */

1302

return 0;

1303

}

1304

1305

/* XXX more rules here */

1306

1307

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

1289

1308

if(ret == -1){

1290

1309

if(debug){

1291

perror_plus("Could not stat hook");

1310

perror_plus("Could not stat plugin");

1292

1311

}

1293

1312

return 0;

1294

1313

}

1295

1314

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

1296

1315

/* Not a regular file */

1297

if(debug){

1298

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

1299

direntry->d_name);

1300

}

1301

1316

return 0;

1302

1317

}

1303

1318

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

1304

1319

/* Not executable */

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

1320

return 0;

1310

1321

}

1311

if(debug){

1312

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

1313

direntry->d_name);

1314

}

1315

1322

return 1;

1316

1323

}

1317

1324

1331

while(true){

1325

1332

if(mc.current_server == NULL){

1326

1333

if (debug){

1327

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

1328

" No timeout!\n");

1334

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

1335

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

1329

1336

}

1330

1337

ret = avahi_simple_poll_iterate(s, -1);

1331

1338

} else {

1332

1339

if (debug){

1333

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

1334

" it, or wait\n");

1340

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

1341

"Check current_server if we should run it,"

1342

" or wait\n");

1335

1343

}

1336

1344

/* the current time */

1337

1345

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1353

1361

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

1354

1362

1355

1363

if (debug){

1356

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

1357

block_time);

1364

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

1365

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

1358

1366

}

1359

1367

1360

1368

if(block_time <= 0){

1387

1395

}

1388

1396

}

1389

1397

1390

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

1391

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1397

if(numhooks == -1){

1398

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1406

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1475

free(delaystring);

1476

if(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

1524

}

1525

1526

1398

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

1527

1399

AvahiSServiceBrowser *sb = NULL;

1528

1400

int error;

1608

1480

.group = 2 },

1609

1481

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

1610

1482

.arg = "SECONDS",

1611

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

1612

.group = 2 },

1613

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

1614

.arg = "DIR",

1615

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

1483

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

1616

1484

.group = 2 },

1617

1485

/*

1618

1486

* These reproduce what we would get without ARGP_NO_HELP

1672

1540

argp_error(state, "Bad retry interval");

1673

1541

}

1674

1542

break;

1675

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

1676

hookdir = arg;

1677

break;

1678

1543

/*

1679

1544

* These reproduce what we would get without ARGP_NO_HELP

1680

1545

*/

1686

1551

argp_state_help(state, state->out_stream,

1687

1552

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1688

1553

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

1689

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

1554

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

1555

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

1690

1556

exit(argp_err_exit_status);

1691

1557

break;

1692

1558

default:

1719

1585

{

1720

1586

/* Work around Debian bug #633582:

1721

1587

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

1588

struct stat st;

1722

1589

1723

1590

/* Re-raise priviliges */

1724

1591

errno = 0;

1725

1592

ret = seteuid(0);

1726

1593

if(ret == -1){

1727

1594

perror_plus("seteuid");

1595

}

1596

1597

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

1598

int seckey_fd = open(seckey, O_RDONLY);

1599

if(seckey_fd == -1){

1600

perror_plus("open");

1601

} else {

1602

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

1603

if(ret == -1){

1604

perror_plus("fstat");

1605

} else {

1606

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

1607

ret = fchown(seckey_fd, uid, gid);

1608

if(ret == -1){

1609

perror_plus("fchown");

1610

}

1611

}

1612

}

1613

TEMP_FAILURE_RETRY(close(seckey_fd));

1614

}

1615

}

1616

1617

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

1618

int pubkey_fd = open(pubkey, O_RDONLY);

1619

if(pubkey_fd == -1){

1620

perror_plus("open");

1621

} else {

1622

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

1623

if(ret == -1){

1624

perror_plus("fstat");

1625

} else {

1626

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

1627

ret = fchown(pubkey_fd, uid, gid);

1628

if(ret == -1){

1629

perror_plus("fchown");

1630

}

1631

}

1632

}

1633

TEMP_FAILURE_RETRY(close(pubkey_fd));

1634

}

1635

}

1636

1637

/* Lower privileges */

1638

errno = 0;

1639

ret = seteuid(uid);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

}

1644

1645

/* Find network hooks and run them */

1646

{

1647

struct dirent **direntries;

1648

struct dirent *direntry;

1649

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

1650

alphasort);

1651

if(numhooks == -1){

1652

perror_plus("scandir");

1728

1653

} else {

1729

struct stat st;

1730

1731

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

1732

int seckey_fd = open(seckey, O_RDONLY);

1733

if(seckey_fd == -1){

1734

perror_plus("open");

1735

} else {

1736

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

1737

if(ret == -1){

1738

perror_plus("fstat");

1739

} else {

1740

if(S_ISREG(st.st_mode)

1741

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

1742

ret = fchown(seckey_fd, uid, gid);

1743

if(ret == -1){

1744

perror_plus("fchown");

1745

}

1746

}

1747

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

1749

}

1750

}

1751

1752

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

1753

int pubkey_fd = open(pubkey, O_RDONLY);

1754

if(pubkey_fd == -1){

1755

perror_plus("open");

1756

} else {

1757

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

1758

if(ret == -1){

1759

perror_plus("fstat");

1760

} else {

1761

if(S_ISREG(st.st_mode)

1762

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

1763

ret = fchown(pubkey_fd, uid, gid);

1764

if(ret == -1){

1765

perror_plus("fchown");

1766

}

1767

}

1768

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

1773

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1654

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

1655

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

1656

direntry = direntries[0];

1657

char *fullname = NULL;

1658

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

1659

direntry->d_name);

1660

if(ret < 0){

1661

perror_plus("asprintf");

1662

continue;

1663

}

1664

pid_t hook_pid = fork();

1665

if(hook_pid == 0){

1666

/* Child */

1667

dup2(devnull, STDIN_FILENO);

1668

close(devnull);

1669

dup2(STDERR_FILENO, STDOUT_FILENO);

1670

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

1671

if(ret == -1){

1672

perror_plus("setenv");

1673

exit(1);

1674

}

1675

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

1676

if(ret == -1){

1677

perror_plus("setenv");

1678

exit(1);

1679

}

1680

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

1681

if(ret == -1){

1682

perror_plus("setenv");

1683

exit(1);

1684

}

1685

char *delaystring;

1686

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

1687

if(ret == -1){

1688

perror_plus("asprintf");

1689

exit(1);

1690

}

1691

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

1692

if(ret == -1){

1693

free(delaystring);

1694

perror_plus("setenv");

1695

exit(1);

1696

}

1697

free(delaystring);

1698

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

1699

perror_plus("execl");

1700

} else {

1701

int status;

1702

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

1703

perror_plus("waitpid");

1704

free(fullname);

1705

continue;

1706

}

1707

if(WIFEXITED(status)){

1708

if(WEXITSTATUS(status) != 0){

1709

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

1710

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

1711

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

1712

WEXITSTATUS(status));

1713

free(fullname);

1714

continue;

1715

}

1716

} else if(WIFSIGNALED(status)){

1717

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

1718

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

1719

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

1720

WTERMSIG(status));

1721

free(fullname);

1722

continue;

1723

} else {

1724

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

1725

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

1726

direntry->d_name);

1727

free(fullname);

1728

continue;

1729

}

1730

}

1731

free(fullname);

1732

if(quit_now){

1733

goto end;

1734

}

1735

}

1736

close(devnull);

1779

1737

}

1780

1738

}

1781

1739

1782

/* Run network hooks */

1783

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

1784

goto end;

1785

}

1786

1787

1740

if(not debug){

1788

1741

avahi_set_log_function(empty_log);

1789

1742

}

1803

1756

/* Pick the first interface returned */

1804

1757

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

1805

1758

if(debug){

1806

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

1759

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

1760

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

1807

1761

}

1808

1762

if(interface == NULL){

1809

1763

perror_plus("malloc");

1814

1768

free(direntries);

1815

1769

} else {

1816

1770

free(direntries);

1817

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

1771

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

1772

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

1818

1773

exitcode = EXIT_FAILURE;

1819

1774

goto end;

1820

1775

}

1826

1781

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

1827

1782

mc.simple_poll = avahi_simple_poll_new();

1828

1783

if(mc.simple_poll == NULL){

1829

fprintf_plus(stderr,

1830

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

1784

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

1785

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

1831

1786

exitcode = EX_UNAVAILABLE;

1832

1787

goto end;

1833

1788

}

1899

1854

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

1900

1855

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

1856

if(if_index == 0){

1902

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

1857

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

1858

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

1903

1859

exitcode = EX_UNAVAILABLE;

1904

1860

goto end;

1905

1861

}

2025

1981

#endif /* __linux__ */

2026

1982

/* Lower privileges */

2027

1983

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

1984

if(take_down_interface){

1985

/* Lower privileges */

1986

ret = seteuid(uid);

1987

if(ret == -1){

1988

perror_plus("seteuid");

1989

}

1990

} else {

1991

/* Lower privileges permanently */

1992

ret = setuid(uid);

1993

if(ret == -1){

1994

perror_plus("setuid");

1995

}

2032

1996

}

2033

1997

}

2034

1998

2038

2002

2039

2003

ret = init_gnutls_global(pubkey, seckey);

2040

2004

if(ret == -1){

2041

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

2005

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

2006

"init_gnutls_global failed\n");

2042

2007

exitcode = EX_UNAVAILABLE;

2043

2008

goto end;

2044

2009

} else {

2060

2025

}

2061

2026

2062

2027

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

2063

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

2028

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

2029

"init_gpgme failed\n");

2064

2030

exitcode = EX_UNAVAILABLE;

2065

2031

goto end;

2066

2032

} else {

2076

2042

/* (Mainly meant for debugging) */

2077

2043

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

2078

2044

if(address == NULL){

2079

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

2045

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

2046

"No colon in address\n");

2080

2047

exitcode = EX_USAGE;

2081

2048

goto end;

2082

2049

}

2090

2057

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

2091

2058

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

2092

2059

or tmpmax != (uint16_t)tmpmax){

2093

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

2060

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

2061

"Bad port number\n");

2094

2062

exitcode = EX_USAGE;

2095

2063

goto end;

2096

2064

}

2126

2094

break;

2127

2095

}

2128

2096

if(debug){

2129

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

2130

(int)retry_interval);

2097

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

2098

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

2131

2099

}

2132

2100

sleep((int)retry_interval);

2133

2101

}

2163

2131

2164

2132

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

2165

2133

if(mc.server == NULL){

2166

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

2167

avahi_strerror(error));

2134

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

2135

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

2136

avahi_strerror(error));

2168

2137

exitcode = EX_UNAVAILABLE;

2169

2138

goto end;

2170

2139

}

2178

2147

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

2148

NULL, 0, browse_callback, NULL);

2180

2149

if(sb == NULL){

2181

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

2182

avahi_strerror(avahi_server_errno(mc.server)));

2150

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

2151

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

2152

avahi_strerror(avahi_server_errno(mc.server)));

2183

2153

exitcode = EX_UNAVAILABLE;

2184

2154

goto end;

2185

2155

}

2191

2161

/* Run the main loop */

2192

2162

2193

2163

if(debug){

2194

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

2164

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

2165

"Starting Avahi loop search\n");

2195

2166

}

2196

2167

2197

2168

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

2169

(int)(retry_interval * 1000));

2199

2170

if(debug){

2200

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

2201

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

2171

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

2172

"avahi_loop_with_timeout exited %s\n",

2173

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

2202

2174

}

2203

2175

2204

2176

end:

2205

2177

2206

2178

if(debug){

2207

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

2179

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

2180

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

2208

2181

}

2209

2182

2210

2183

/* Cleanup things */

2226

2199

if(gpgme_initialized){

2227

2200

gpgme_release(mc.ctx);

2228

2201

}

2229

2202

2230

2203

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

2231

2204

has seen */

2232

2205

if(mc.current_server != NULL){

2238

2211

}

2239

2212

}

2240

2213

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2214

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

2243

2215

2244

/* Re-raise priviliges */

2245

{

2216

/* Take down the network interface */

2217

if(take_down_interface){

2218

/* Re-raise priviliges */

2246

2219

errno = 0;

2247

2220

ret = seteuid(0);

2248

2221

if(ret == -1){

2249

2222

perror_plus("seteuid");

2250

2223

}

2251

2252

/* Take down the network interface */

2253

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

2224

if(geteuid() == 0){

2254

2225

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

2255

2226

if(ret == -1){

2256

2227

perror_plus("ioctl SIOCGIFFLAGS");

2265

2236

if(ret == -1){

2266

2237

perror_plus("close");

2267

2238

}

2239

/* Lower privileges permanently */

2240

errno = 0;

2241

ret = setuid(uid);

2242

if(ret == -1){

2243

perror_plus("setuid");

2244

}

2268

2245

}

2269

2246

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2276

2247

2277

2248

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

2278

2249

if(tempdir_created){

2292

2263

}

2293

2264

ret = remove(fullname);

2294

2265

if(ret == -1){

2295

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

2296

strerror(errno));

2266

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

2267

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

2297

2268

}

2298

2269

free(fullname);

2299

2270

}