/mandos/trunk : revision 505.3.5

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

175

174

perror(print_text);

176

175

}

177

176

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

186

187

177

/*

188

178

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

189

179

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

190

180

* "buffer_length" is how much is already used.

191

181

*/

192

182

size_t incbuffer(char **buffer, size_t buffer_length,

193

size_t buffer_capacity){

183

size_t buffer_capacity){

194

184

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

185

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

196

186

if(buffer == NULL){

202

192

}

203

193

204

194

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

205

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

206

int af){

195

int add_server(const char *ip, uint16_t port,

196

AvahiIfIndex if_index,

197

int af){

207

198

int ret;

208

199

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

209

200

if(new_server == NULL){

211

202

return -1;

212

203

}

213

204

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

214

.port = port,

215

.if_index = if_index,

216

.af = af };

205

.port = port,

206

.if_index = if_index,

207

.af = af };

217

208

if(new_server->ip == NULL){

218

209

perror_plus("strdup");

219

210

return -1;

241

232

/*

242

233

* Initialize GPGME.

243

234

*/

244

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

245

const char *tempdir){

235

static bool init_gpgme(const char *seckey,

236

const char *pubkey, const char *tempdir){

246

237

gpgme_error_t rc;

247

238

gpgme_engine_info_t engine_info;

248

239

263

254

264

255

rc = gpgme_data_new_from_fd(&pgp_data, fd);

265

256

if(rc != GPG_ERR_NO_ERROR){

266

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

267

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));

268

260

return false;

269

261

}

270

262

271

263

rc = gpgme_op_import(mc.ctx, pgp_data);

272

264

if(rc != GPG_ERR_NO_ERROR){

273

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

274

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));

275

268

return false;

276

269

}

277

270

284

277

}

285

278

286

279

if(debug){

287

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

280

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

281

"Initializing GPGME\n");

288

282

}

289

283

290

284

/* Init GPGME */

291

285

gpgme_check_version(NULL);

292

286

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

293

287

if(rc != GPG_ERR_NO_ERROR){

294

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

295

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));

296

291

return false;

297

292

}

298

293

299

294

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

300

295

rc = gpgme_get_engine_info(&engine_info);

301

296

if(rc != GPG_ERR_NO_ERROR){

302

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

303

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));

304

300

return false;

305

301

}

306

302

while(engine_info != NULL){

312

308

engine_info = engine_info->next;

313

309

}

314

310

if(engine_info == NULL){

315

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

316

tempdir);

311

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

312

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

317

313

return false;

318

314

}

319

315

320

316

/* Create new GPGME "context" */

321

317

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

322

318

if(rc != GPG_ERR_NO_ERROR){

323

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

324

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

325

gpgme_strerror(rc));

319

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

320

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

321

gpgme_strerror(rc));

326

322

return false;

327

323

}

328

324

347

343

ssize_t plaintext_length = 0;

348

344

349

345

if(debug){

350

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

346

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

347

"Trying to decrypt OpenPGP data\n");

351

348

}

352

349

353

350

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

354

351

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

355

352

0);

356

353

if(rc != GPG_ERR_NO_ERROR){

357

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

358

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));

359

357

return -1;

360

358

}

361

359

362

360

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

363

361

rc = gpgme_data_new(&dh_plain);

364

362

if(rc != GPG_ERR_NO_ERROR){

365

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

366

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

367

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));

368

366

gpgme_data_release(dh_crypto);

369

367

return -1;

370

368

}

373

371

data buffer */

374

372

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

375

373

if(rc != GPG_ERR_NO_ERROR){

376

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

377

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));

378

377

plaintext_length = -1;

379

378

if(debug){

380

379

gpgme_decrypt_result_t result;

381

380

result = gpgme_op_decrypt_result(mc.ctx);

382

381

if(result == NULL){

383

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

382

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

383

"gpgme_op_decrypt_result failed\n");

384

} else {

385

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

386

result->unsupported_algorithm);

387

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

388

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);

389

391

if(result->file_name != NULL){

390

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);

391

394

}

392

395

gpgme_recipient_t recipient;

393

396

recipient = result->recipients;

394

397

while(recipient != NULL){

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "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");

402

407

recipient = recipient->next;

403

408

}

404

409

}

407

412

}

408

413

409

414

if(debug){

410

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

415

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

416

"Decryption of OpenPGP data succeeded\n");

411

417

}

412

418

413

419

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

420

426

*plaintext = NULL;

421

427

while(true){

422

428

plaintext_capacity = incbuffer(plaintext,

423

(size_t)plaintext_length,

424

plaintext_capacity);

429

(size_t)plaintext_length,

430

plaintext_capacity);

425

431

if(plaintext_capacity == 0){

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

429

435

}

430

436

431

437

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

444

450

}

445

451

446

452

if(debug){

447

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

453

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

454

"Decrypted password is: ");

448

455

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

449

456

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

450

457

}

472

479

/* GnuTLS log function callback */

473

480

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

474

481

const char* string){

475

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

482

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

476

483

}

477

484

478

485

static int init_gnutls_global(const char *pubkeyfilename,

480

487

int ret;

481

488

482

489

if(debug){

483

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

490

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

491

"Initializing GnuTLS\n");

484

492

}

485

493

486

494

ret = gnutls_global_init();

487

495

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

496

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

497

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

490

498

return -1;

491

499

}

492

500

501

509

/* OpenPGP credentials */

502

510

ret = gnutls_certificate_allocate_credentials(&mc.cred);

503

511

if(ret != GNUTLS_E_SUCCESS){

504

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

505

safer_gnutls_strerror(ret));

512

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

513

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

506

514

gnutls_global_deinit();

507

515

return -1;

508

516

}

509

517

510

518

if(debug){

511

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

512

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

513

pubkeyfilename,

514

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);

515

523

}

516

524

517

525

ret = gnutls_certificate_set_openpgp_key_file

518

526

(mc.cred, pubkeyfilename, seckeyfilename,

519

527

GNUTLS_OPENPGP_FMT_BASE64);

520

528

if(ret != GNUTLS_E_SUCCESS){

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

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));

526

535

goto globalfail;

527

536

}

528

537

529

538

/* GnuTLS server initialization */

530

539

ret = gnutls_dh_params_init(&mc.dh_params);

531

540

if(ret != GNUTLS_E_SUCCESS){

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

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));

535

544

goto globalfail;

536

545

}

537

546

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

538

547

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

548

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

549

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

550

safer_gnutls_strerror(ret));

541

551

goto globalfail;

542

552

}

543

553

563

573

}

564

574

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

565

575

if(ret != GNUTLS_E_SUCCESS){

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

576

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

577

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

578

safer_gnutls_strerror(ret));

569

579

}

570

580

571

581

{

578

588

}

579

589

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

580

590

if(ret != GNUTLS_E_SUCCESS){

581

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

582

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

583

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));

584

595

gnutls_deinit(*session);

585

596

return -1;

586

597

}

595

606

}

596

607

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

597

608

if(ret != GNUTLS_E_SUCCESS){

598

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

599

safer_gnutls_strerror(ret));

609

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

610

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

611

safer_gnutls_strerror(ret));

600

612

gnutls_deinit(*session);

601

613

return -1;

602

614

}

647

659

pf = PF_INET;

648

660

break;

649

661

default:

650

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

662

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

663

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

651

664

errno = EINVAL;

652

665

return -1;

653

666

}

658

671

}

659

672

660

673

if(debug){

661

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

662

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);

663

677

}

664

678

665

679

tcp_sd = socket(pf, SOCK_STREAM, 0);

691

705

}

692

706

if(ret == 0){

693

707

int e = errno;

694

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

708

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

709

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

695

710

errno = e;

696

711

goto mandos_end;

697

712

}

702

717

703

718

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

719

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

705

-Wunreachable-code*/

720

-Wunreachable-code*/

706

721

if(if_index == AVAHI_IF_UNSPEC){

707

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

708

" 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");

709

725

errno = EINVAL;

710

726

goto mandos_end;

711

727

}

729

745

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

730

746

perror_plus("if_indextoname");

731

747

} else {

732

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

733

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

748

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

749

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

750

ip, interface, port);

734

751

}

735

752

} else {

736

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

737

ip, port);

753

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

754

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

738

755

}

739

756

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

757

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

767

perror_plus("inet_ntop");

751

768

} else {

752

769

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

753

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

770

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

771

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

754

772

}

755

773

}

756

774

}

784

802

while(true){

785

803

size_t out_size = strlen(out);

786

804

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

787

out_size - written));

805

out_size - written));

788

806

if(ret == -1){

789

807

int e = errno;

790

808

perror_plus("write");

810

828

}

811

829

812

830

if(debug){

813

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);

814

833

}

815

834

816

835

if(quit_now){

836

855

837

856

if(ret != GNUTLS_E_SUCCESS){

838

857

if(debug){

839

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

858

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

859

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

840

860

gnutls_perror(ret);

841

861

}

842

862

errno = EPROTO;

846

866

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

847

867

848

868

if(debug){

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

869

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

870

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

851

871

}

852

872

853

873

while(true){

858

878

}

859

879

860

880

buffer_capacity = incbuffer(&buffer, buffer_length,

861

buffer_capacity);

881

buffer_capacity);

862

882

if(buffer_capacity == 0){

863

883

int e = errno;

864

884

perror_plus("incbuffer");

891

911

}

892

912

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

893

913

if(ret < 0){

894

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

895

"***\n");

914

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

915

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

896

916

gnutls_perror(ret);

897

917

errno = EPROTO;

898

918

goto mandos_end;

899

919

}

900

920

break;

901

921

default:

902

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

903

" 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");

904

925

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

926

errno = EIO;

906

927

goto mandos_end;

911

932

}

912

933

913

934

if(debug){

914

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

935

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

936

"Closing TLS session\n");

915

937

}

916

938

917

939

if(quit_now){

929

951

930

952

if(buffer_length > 0){

931

953

ssize_t decrypted_buffer_size;

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

954

decrypted_buffer_size = pgp_packet_decrypt(buffer,

955

buffer_length,

933

956

&decrypted_buffer);

934

957

if(decrypted_buffer_size >= 0){

935

958

946

969

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

947

970

int e = errno;

948

971

if(debug){

949

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

950

strerror(errno));

972

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

973

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

974

strerror(errno));

951

975

}

952

976

errno = e;

953

977

goto mandos_end;

1010

1034

switch(event){

1011

1035

default:

1012

1036

case AVAHI_RESOLVER_FAILURE:

1013

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

1014

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

1015

domain,

1016

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)));

1017

1041

break;

1018

1042

1019

1043

case AVAHI_RESOLVER_FOUND:

1021

1045

char ip[AVAHI_ADDRESS_STR_MAX];

1022

1046

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

1023

1047

if(debug){

1024

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

1025

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

1026

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);

1027

1052

}

1028

1053

int ret = start_mandos_communication(ip, port, interface,

1029

1054

avahi_proto_to_af(proto));

1061

1086

default:

1062

1087

case AVAHI_BROWSER_FAILURE:

1063

1088

1064

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

1065

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)));

1066

1092

avahi_simple_poll_quit(mc.simple_poll);

1067

1093

return;

1068

1094

1075

1101

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

1076

1102

name, type, domain, protocol, 0,

1077

1103

resolve_callback, NULL) == NULL)

1078

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

1079

" %s\n", name,

1080

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)));

1081

1107

break;

1082

1108

1083

1109

case AVAHI_BROWSER_REMOVE:

1086

1112

case AVAHI_BROWSER_ALL_FOR_NOW:

1087

1113

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1088

1114

if(debug){

1089

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

1090

" searching...\n");

1115

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

1116

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

1091

1117

}

1092

1118

break;

1093

1119

}

1132

1158

/* Reject the loopback device */

1133

1159

if(ifr->ifr_flags & IFF_LOOPBACK){

1134

1160

if(debug){

1135

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

1136

ifname);

1161

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

1162

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

1137

1163

}

1138

1164

return false;

1139

1165

}

1140

1166

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

1141

1167

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

1142

1168

if(debug){

1143

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

1144

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

1169

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

1170

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

1145

1171

}

1146

1172

return true;

1147

1173

}

1148

1174

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

1149

1175

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

1150

1176

if(debug){

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1177

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

1178

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

1153

1179

}

1154

1180

return false;

1155

1181

}

1156

1182

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

1157

1183

if(ifr->ifr_flags & IFF_NOARP){

1158

1184

if(debug){

1159

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

1160

ifname);

1185

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

1186

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

1161

1187

}

1162

1188

return false;

1163

1189

}

1164

1190

1165

1191

/* Accept this device */

1166

1192

if(debug){

1167

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

1193

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

1194

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

1168

1195

}

1169

1196

return true;

1170

1197

}

1182

1209

struct ifreq ifr;

1183

1210

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

1184

1211

if(debug){

1185

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

1186

"\"%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);

1187

1215

}

1188

1216

return 0;

1189

1217

}

1207

1235

struct ifreq ifr;

1208

1236

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

1209

1237

if(debug){

1210

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

1211

"\"%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);

1212

1241

}

1213

1242

return 0;

1214

1243

}

1216

1245

/* Reject down interfaces */

1217

1246

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

1218

1247

if(debug){

1219

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

1220

if_entry->d_name);

1248

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

1249

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

1250

if_entry->d_name);

1221

1251

}

1222

1252

return 0;

1223

1253

}

1225

1255

/* Reject non-running interfaces */

1226

1256

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

1227

1257

if(debug){

1228

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

1229

if_entry->d_name);

1258

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

1259

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

1260

if_entry->d_name);

1230

1261

}

1231

1262

return 0;

1232

1263

}

1251

1282

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

1252

1283

int runnable_hook(const struct dirent *direntry){

1253

1284

int ret;

1254

size_t sret;

1255

1285

struct stat st;

1256

1286

1257

1287

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

1259

1289

return 0;

1260

1290

}

1261

1291

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

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 */

1274

1307

1275

1308

char *fullname = NULL;

1276

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

1309

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

1310

direntry->d_name);

1277

1311

if(ret < 0){

1278

1312

perror_plus("asprintf");

1279

1313

return 0;

1282

1316

ret = stat(fullname, &st);

1283

1317

if(ret == -1){

1284

1318

if(debug){

1285

perror_plus("Could not stat hook");

1319

perror_plus("Could not stat plugin");

1286

1320

}

1287

1321

return 0;

1288

1322

}

1289

1323

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

1290

1324

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1295

1325

return 0;

1296

1326

}

1297

1327

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

1298

1328

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1303

1329

return 0;

1304

1330

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

1331

return 1;

1310

1332

}

1311

1333

1318

1340

while(true){

1319

1341

if(mc.current_server == NULL){

1320

1342

if (debug){

1321

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

1322

" No timeout!\n");

1343

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

1344

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

1323

1345

}

1324

1346

ret = avahi_simple_poll_iterate(s, -1);

1325

1347

} else {

1326

1348

if (debug){

1327

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

1328

" it, or wait\n");

1349

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

1350

"Check current_server if we should run it,"

1351

" or wait\n");

1329

1352

}

1330

1353

/* the current time */

1331

1354

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1347

1370

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

1348

1371

1349

1372

if (debug){

1350

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

1351

block_time);

1373

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

1374

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

1352

1375

}

1353

1376

1354

1377

if(block_time <= 0){

1381

1404

}

1382

1405

}

1383

1406

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

1511

1407

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

1512

1408

AvahiSServiceBrowser *sb = NULL;

1513

1409

int error;

1671

1567

argp_state_help(state, state->out_stream,

1672

1568

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1673

1569

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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);

1677

1572

exit(argp_err_exit_status);

1678

1573

break;

1679

1574

default:

1706

1601

{

1707

1602

/* Work around Debian bug #633582:

1708

1603

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

1604

struct stat st;

1709

1605

1710

1606

/* Re-raise priviliges */

1711

1607

errno = 0;

1712

1608

ret = seteuid(0);

1713

1609

if(ret == -1){

1714

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");

1715

1669

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

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);

1766

1752

}

1767

1753

}

1768

1754

1769

/* Run network hooks */

1770

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

1771

goto end;

1772

}

1773

1774

1755

if(not debug){

1775

1756

avahi_set_log_function(empty_log);

1776

1757

}

1790

1771

/* Pick the first interface returned */

1791

1772

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

1792

1773

if(debug){

1793

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

1774

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

1775

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

1794

1776

}

1795

1777

if(interface == NULL){

1796

1778

perror_plus("malloc");

1801

1783

free(direntries);

1802

1784

} else {

1803

1785

free(direntries);

1804

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");

1805

1788

exitcode = EXIT_FAILURE;

1806

1789

goto end;

1807

1790

}

1813

1796

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

1814

1797

mc.simple_poll = avahi_simple_poll_new();

1815

1798

if(mc.simple_poll == NULL){

1816

fprintf_plus(stderr,

1817

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

1799

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

1800

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

1818

1801

exitcode = EX_UNAVAILABLE;

1819

1802

goto end;

1820

1803

}

1886

1869

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

1887

1870

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

1871

if(if_index == 0){

1889

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

1872

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

1873

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

1890

1874

exitcode = EX_UNAVAILABLE;

1891

1875

goto end;

1892

1876

}

2012

1996

#endif /* __linux__ */

2013

1997

/* Lower privileges */

2014

1998

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

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

}

2019

2011

}

2020

2012

}

2021

2013

2025

2017

2026

2018

ret = init_gnutls_global(pubkey, seckey);

2027

2019

if(ret == -1){

2028

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

2020

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

2021

"init_gnutls_global failed\n");

2029

2022

exitcode = EX_UNAVAILABLE;

2030

2023

goto end;

2031

2024

} else {

2047

2040

}

2048

2041

2049

2042

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

2050

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

2043

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

2044

"init_gpgme failed\n");

2051

2045

exitcode = EX_UNAVAILABLE;

2052

2046

goto end;

2053

2047

} else {

2063

2057

/* (Mainly meant for debugging) */

2064

2058

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

2065

2059

if(address == NULL){

2066

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

2060

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

2061

"No colon in address\n");

2067

2062

exitcode = EX_USAGE;

2068

2063

goto end;

2069

2064

}

2077

2072

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

2078

2073

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

2079

2074

or tmpmax != (uint16_t)tmpmax){

2080

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

2075

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

2076

"Bad port number\n");

2081

2077

exitcode = EX_USAGE;

2082

2078

goto end;

2083

2079

}

2113

2109

break;

2114

2110

}

2115

2111

if(debug){

2116

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

2117

(int)retry_interval);

2112

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

2113

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

2118

2114

}

2119

2115

sleep((int)retry_interval);

2120

2116

}

2150

2146

2151

2147

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

2152

2148

if(mc.server == NULL){

2153

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

2154

avahi_strerror(error));

2149

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

2150

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

2151

avahi_strerror(error));

2155

2152

exitcode = EX_UNAVAILABLE;

2156

2153

goto end;

2157

2154

}

2165

2162

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2166

2163

NULL, 0, browse_callback, NULL);

2167

2164

if(sb == NULL){

2168

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

2169

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)));

2170

2168

exitcode = EX_UNAVAILABLE;

2171

2169

goto end;

2172

2170

}

2178

2176

/* Run the main loop */

2179

2177

2180

2178

if(debug){

2181

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

2179

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

2180

"Starting Avahi loop search\n");

2182

2181

}

2183

2182

2184

2183

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

2184

(int)(retry_interval * 1000));

2186

2185

if(debug){

2187

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

2188

(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");

2189

}

2190

2191

end:

2192

2193

if(debug){

2194

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

2194

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

2195

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

2195

2196

}

2196

2197

2198

/* Cleanup things */

2213

2214

if(gpgme_initialized){

2214

2215

gpgme_release(mc.ctx);

2215

2216

}

2216

2217

2218

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

2218

2219

has seen */

2219

2220

if(mc.current_server != NULL){

2225

2226

}

2226

2227

}

2227

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2229

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

2230

2231

/* Re-raise priviliges */

2232

{

2231

/* Take down the network interface */

2232

if(take_down_interface){

2233

/* Re-raise priviliges */

2233

2234

errno = 0;

2234

2235

ret = seteuid(0);

2235

2236

if(ret == -1){

2236

2237

perror_plus("seteuid");

2237

2238

}

2238

2239

/* Take down the network interface */

2240

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

2239

if(geteuid() == 0){

2241

2240

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

2242

2241

if(ret == -1){

2243

2242

perror_plus("ioctl SIOCGIFFLAGS");

2252

2251

if(ret == -1){

2253

2252

perror_plus("close");

2254

2253

}

2254

/* Lower privileges permanently */

2255

errno = 0;

2256

ret = setuid(uid);

2257

if(ret == -1){

2258

perror_plus("setuid");

2259

}

2255

2260

}

2256

2261

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2263

2262

2264

2263

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

2265

2264

if(tempdir_created){

2279

2278

}

2280

2279

ret = remove(fullname);

2281

2280

if(ret == -1){

2282

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

2283

strerror(errno));

2281

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

2282

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

2284

2283

}

2285

2284

free(fullname);

2286

2285

}