/mandos/trunk : revision 505.2.5

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

181

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

183

182

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

184

183

}

185

184

262

261

263

262

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

263

if(rc != GPG_ERR_NO_ERROR){

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

264

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

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

267

return false;

268

}

269

270

rc = gpgme_op_import(mc.ctx, pgp_data);

271

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

274

275

return false;

275

276

}

276

277

283

284

}

284

285

286

if(debug){

286

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

287

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

288

"Initializing GPGME\n");

287

289

}

288

290

289

291

/* Init GPGME */

290

292

gpgme_check_version(NULL);

291

293

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

294

if(rc != GPG_ERR_NO_ERROR){

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

295

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

296

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

297

gpgme_strsource(rc), gpgme_strerror(rc));

295

298

return false;

296

299

}

297

300

298

301

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

299

302

rc = gpgme_get_engine_info(&engine_info);

300

303

if(rc != GPG_ERR_NO_ERROR){

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

304

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

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

303

307

return false;

304

308

}

305

309

while(engine_info != NULL){

311

315

engine_info = engine_info->next;

312

316

}

313

317

if(engine_info == NULL){

314

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

315

tempdir);

318

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

319

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

316

320

return false;

317

321

}

318

322

319

323

/* Create new GPGME "context" */

320

324

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

321

325

if(rc != GPG_ERR_NO_ERROR){

322

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

323

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

324

gpgme_strerror(rc));

326

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

327

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

328

gpgme_strerror(rc));

325

329

return false;

326

330

}

327

331

346

350

ssize_t plaintext_length = 0;

347

351

348

352

if(debug){

349

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

353

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

354

"Trying to decrypt OpenPGP data\n");

350

355

}

351

356

352

357

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

353

358

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

359

0);

355

360

if(rc != GPG_ERR_NO_ERROR){

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

361

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

362

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

363

gpgme_strsource(rc), gpgme_strerror(rc));

358

364

return -1;

359

365

}

360

366

361

367

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

362

368

rc = gpgme_data_new(&dh_plain);

363

369

if(rc != GPG_ERR_NO_ERROR){

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

370

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

371

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

372

gpgme_strsource(rc), gpgme_strerror(rc));

367

373

gpgme_data_release(dh_crypto);

368

374

return -1;

369

375

}

372

378

data buffer */

373

379

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

374

380

if(rc != GPG_ERR_NO_ERROR){

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

381

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

382

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

383

gpgme_strsource(rc), gpgme_strerror(rc));

377

384

plaintext_length = -1;

378

385

if(debug){

379

386

gpgme_decrypt_result_t result;

380

387

result = gpgme_op_decrypt_result(mc.ctx);

381

388

if(result == NULL){

382

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

389

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

390

"gpgme_op_decrypt_result failed\n");

383

391

} else {

384

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

385

result->unsupported_algorithm);

386

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

387

result->wrong_key_usage);

392

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

393

"Unsupported algorithm: %s\n",

394

result->unsupported_algorithm);

395

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

396

"Wrong key usage: %u\n",

397

result->wrong_key_usage);

388

398

if(result->file_name != NULL){

389

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

399

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

400

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

390

401

}

391

402

gpgme_recipient_t recipient;

392

403

recipient = result->recipients;

393

404

while(recipient != NULL){

394

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

395

gpgme_pubkey_algo_name

396

(recipient->pubkey_algo));

397

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

398

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

399

recipient->status == GPG_ERR_NO_SECKEY

400

? "No" : "Yes");

405

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

406

"Public key algorithm: %s\n",

407

gpgme_pubkey_algo_name(recipient->pubkey_algo));

408

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

409

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

410

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

411

"Secret key available: %s\n",

412

recipient->status == GPG_ERR_NO_SECKEY

413

? "No" : "Yes");

401

414

recipient = recipient->next;

402

415

}

403

416

}

406

419

}

407

420

408

421

if(debug){

409

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

422

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

423

"Decryption of OpenPGP data succeeded\n");

410

424

}

411

425

412

426

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

443

457

}

444

458

445

459

if(debug){

446

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

460

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

461

"Decrypted password is: ");

447

462

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

448

463

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

449

464

}

471

486

/* GnuTLS log function callback */

472

487

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

473

488

const char* string){

474

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

489

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

475

490

}

476

491

477

492

static int init_gnutls_global(const char *pubkeyfilename,

479

494

int ret;

480

495

481

496

if(debug){

482

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

497

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

498

"Initializing GnuTLS\n");

483

499

}

484

500

485

501

ret = gnutls_global_init();

486

502

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

503

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

504

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

489

505

return -1;

490

506

}

491

507

500

516

/* OpenPGP credentials */

501

517

ret = gnutls_certificate_allocate_credentials(&mc.cred);

502

518

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

519

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

520

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

505

521

gnutls_global_deinit();

506

522

return -1;

507

523

}

508

524

509

525

if(debug){

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

526

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

527

"Attempting to use OpenPGP public key %s and"

528

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

529

seckeyfilename);

514

530

}

515

531

516

532

ret = gnutls_certificate_set_openpgp_key_file

517

533

(mc.cred, pubkeyfilename, seckeyfilename,

518

534

GNUTLS_OPENPGP_FMT_BASE64);

519

535

if(ret != GNUTLS_E_SUCCESS){

520

fprintf_plus(stderr,

521

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

522

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

523

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

524

safer_gnutls_strerror(ret));

536

fprintf(stderr,

537

"Mandos plugin mandos-client: "

538

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

539

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

540

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

541

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

525

542

goto globalfail;

526

543

}

527

544

528

545

/* GnuTLS server initialization */

529

546

ret = gnutls_dh_params_init(&mc.dh_params);

530

547

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

548

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

549

"Error in GnuTLS DH parameter initialization:"

550

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

534

551

goto globalfail;

535

552

}

536

553

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

537

554

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

555

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

556

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

557

safer_gnutls_strerror(ret));

540

558

goto globalfail;

541

559

}

542

560

562

580

}

563

581

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

564

582

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

583

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

584

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

585

safer_gnutls_strerror(ret));

568

586

}

569

587

570

588

{

577

595

}

578

596

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

579

597

if(ret != GNUTLS_E_SUCCESS){

580

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

581

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

582

safer_gnutls_strerror(ret));

598

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

599

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

600

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

601

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

583

602

gnutls_deinit(*session);

584

603

return -1;

585

604

}

594

613

}

595

614

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

596

615

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

616

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

617

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

618

safer_gnutls_strerror(ret));

599

619

gnutls_deinit(*session);

600

620

return -1;

601

621

}

646

666

pf = PF_INET;

647

667

break;

648

668

default:

649

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

669

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

670

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

650

671

errno = EINVAL;

651

672

return -1;

652

673

}

657

678

}

658

679

659

680

if(debug){

660

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

661

PRIu16 "\n", ip, port);

681

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

682

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

683

"\n", ip, port);

662

684

}

663

685

664

686

tcp_sd = socket(pf, SOCK_STREAM, 0);

690

712

}

691

713

if(ret == 0){

692

714

int e = errno;

693

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

715

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

716

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

694

717

errno = e;

695

718

goto mandos_end;

696

719

}

703

726

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

704

727

-Wunreachable-code*/

705

728

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" incomplete without a network interface\n");

729

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

730

"An IPv6 link-local address is incomplete"

731

" without a network interface\n");

708

732

errno = EINVAL;

709

733

goto mandos_end;

710

734

}

728

752

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

729

753

perror_plus("if_indextoname");

730

754

} else {

731

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

732

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

755

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

756

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

757

ip, interface, port);

733

758

}

734

759

} else {

735

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

736

ip, port);

760

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

761

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

737

762

}

738

763

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

764

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

749

774

perror_plus("inet_ntop");

750

775

} else {

751

776

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

752

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

777

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

778

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

753

779

}

754

780

}

755

781

}

809

835

}

810

836

811

837

if(debug){

812

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

838

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

839

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

813

840

}

814

841

815

842

if(quit_now){

835

862

836

863

if(ret != GNUTLS_E_SUCCESS){

837

864

if(debug){

838

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

865

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

866

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

839

867

gnutls_perror(ret);

840

868

}

841

869

errno = EPROTO;

845

873

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

846

874

847

875

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

876

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

877

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

850

878

}

851

879

852

880

while(true){

890

918

}

891

919

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

892

920

if(ret < 0){

893

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

894

"***\n");

921

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

922

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

895

923

gnutls_perror(ret);

896

924

errno = EPROTO;

897

925

goto mandos_end;

898

926

}

899

927

break;

900

928

default:

901

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

902

" encrypted session with Mandos server\n");

929

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

930

"Unknown error while reading data from"

931

" encrypted session with Mandos server\n");

903

932

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

933

errno = EIO;

905

934

goto mandos_end;

910

939

}

911

940

912

941

if(debug){

913

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

942

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

943

"Closing TLS session\n");

914

944

}

915

945

916

946

if(quit_now){

945

975

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

946

976

int e = errno;

947

977

if(debug){

948

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

949

strerror(errno));

978

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

979

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

980

strerror(errno));

950

981

}

951

982

errno = e;

952

983

goto mandos_end;

1009

1040

switch(event){

1010

1041

default:

1011

1042

case AVAHI_RESOLVER_FAILURE:

1012

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

1013

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

1014

domain,

1015

avahi_strerror(avahi_server_errno(mc.server)));

1043

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

1044

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

1045

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

1046

avahi_strerror(avahi_server_errno(mc.server)));

1016

1047

break;

1017

1048

1018

1049

case AVAHI_RESOLVER_FOUND:

1020

1051

char ip[AVAHI_ADDRESS_STR_MAX];

1021

1052

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

1022

1053

if(debug){

1023

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

1024

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

1025

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

1054

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

1055

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

1056

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

1057

ip, (intmax_t)interface, port);

1026

1058

}

1027

1059

int ret = start_mandos_communication(ip, port, interface,

1028

1060

avahi_proto_to_af(proto));

1060

1092

default:

1061

1093

case AVAHI_BROWSER_FAILURE:

1062

1094

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1095

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

1096

"(Avahi browser) %s\n",

1097

avahi_strerror(avahi_server_errno(mc.server)));

1065

1098

avahi_simple_poll_quit(mc.simple_poll);

1066

1099

return;

1067

1100

1074

1107

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

1075

1108

name, type, domain, protocol, 0,

1076

1109

resolve_callback, NULL) == NULL)

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1110

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

1111

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

1112

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

1080

1113

break;

1081

1114

1082

1115

case AVAHI_BROWSER_REMOVE:

1085

1118

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

1119

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

1120

if(debug){

1088

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

1089

" searching...\n");

1121

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

1122

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

1090

1123

}

1091

1124

break;

1092

1125

}

1131

1164

/* Reject the loopback device */

1132

1165

if(ifr->ifr_flags & IFF_LOOPBACK){

1133

1166

if(debug){

1134

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

1135

ifname);

1167

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

1168

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

1136

1169

}

1137

1170

return false;

1138

1171

}

1139

1172

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

1140

1173

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

1141

1174

if(debug){

1142

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

1143

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

1175

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

1176

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

1144

1177

}

1145

1178

return true;

1146

1179

}

1147

1180

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

1148

1181

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

1149

1182

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1183

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

1184

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

1152

1185

}

1153

1186

return false;

1154

1187

}

1155

1188

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

1156

1189

if(ifr->ifr_flags & IFF_NOARP){

1157

1190

if(debug){

1158

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

1159

ifname);

1191

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

1192

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

1160

1193

}

1161

1194

return false;

1162

1195

}

1163

1196

1164

1197

/* Accept this device */

1165

1198

if(debug){

1166

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

1199

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

1200

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

1167

1201

}

1168

1202

return true;

1169

1203

}

1181

1215

struct ifreq ifr;

1182

1216

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

1183

1217

if(debug){

1184

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

1185

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

1218

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

1219

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

1220

if_entry->d_name);

1186

1221

}

1187

1222

return 0;

1188

1223

}

1206

1241

struct ifreq ifr;

1207

1242

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

1208

1243

if(debug){

1209

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

1210

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

1244

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

1245

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

1246

if_entry->d_name);

1211

1247

}

1212

1248

return 0;

1213

1249

}

1215

1251

/* Reject down interfaces */

1216

1252

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

1217

1253

if(debug){

1218

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

1219

if_entry->d_name);

1254

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

1255

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

1256

if_entry->d_name);

1220

1257

}

1221

1258

return 0;

1222

1259

}

1224

1261

/* Reject non-running interfaces */

1225

1262

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

1226

1263

if(debug){

1227

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

1228

if_entry->d_name);

1264

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

1265

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

1266

if_entry->d_name);

1229

1267

}

1230

1268

return 0;

1231

1269

}

1265

1303

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

1266

1304

/* Contains non-allowed characters */

1267

1305

if(debug){

1268

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

1269

direntry->d_name);

1306

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

1307

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

1308

direntry->d_name);

1270

1309

}

1271

1310

return 0;

1272

1311

}

1288

1327

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

1289

1328

/* Not a regular file */

1290

1329

if(debug){

1291

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

1292

direntry->d_name);

1330

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

1331

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

1332

direntry->d_name);

1293

1333

}

1294

1334

return 0;

1295

1335

}

1296

1336

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

1297

1337

/* Not executable */

1298

1338

if(debug){

1299

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

1300

direntry->d_name);

1339

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

1340

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

1341

direntry->d_name);

1301

1342

}

1302

1343

return 0;

1303

1344

}

1313

1354

while(true){

1314

1355

if(mc.current_server == NULL){

1315

1356

if (debug){

1316

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

1317

" No timeout!\n");

1357

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

1358

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

1318

1359

}

1319

1360

ret = avahi_simple_poll_iterate(s, -1);

1320

1361

} else {

1321

1362

if (debug){

1322

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

1323

" it, or wait\n");

1363

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

1364

"Check current_server if we should run it,"

1365

" or wait\n");

1324

1366

}

1325

1367

/* the current time */

1326

1368

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1342

1384

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

1343

1385

1344

1386

if (debug){

1345

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

1346

block_time);

1387

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

1388

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

1347

1389

}

1348

1390

1349

1391

if(block_time <= 0){

1376

1418

}

1377

1419

}

1378

1420

1379

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

1380

const float delay){

1381

struct dirent **direntries;

1382

struct dirent *direntry;

1383

int ret;

1384

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

1385

alphasort);

1386

if(numhooks == -1){

1387

perror_plus("scandir");

1388

} else {

1389

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

1390

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

1391

direntry = direntries[0];

1392

char *fullname = NULL;

1393

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

1394

if(ret < 0){

1395

perror_plus("asprintf");

1396

continue;

1397

}

1398

pid_t hook_pid = fork();

1399

if(hook_pid == 0){

1400

/* Child */

1401

dup2(devnull, STDIN_FILENO);

1402

close(devnull);

1403

dup2(STDERR_FILENO, STDOUT_FILENO);

1404

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

1405

if(ret == -1){

1406

perror_plus("setenv");

1407

return false;

1408

}

1409

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

1410

if(ret == -1){

1411

perror_plus("setenv");

1412

return false;

1413

}

1414

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

1415

if(ret == -1){

1416

perror_plus("setenv");

1417

return false;

1418

}

1419

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

1420

if(ret == -1){

1421

perror_plus("setenv");

1422

return false;

1423

}

1424

char *delaystring;

1425

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

1426

if(ret == -1){

1427

perror_plus("asprintf");

1428

return false;

1429

}

1430

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

1431

if(ret == -1){

1432

free(delaystring);

1433

perror_plus("setenv");

1434

return false;

1435

}

1436

free(delaystring);

1437

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

1438

perror_plus("execl");

1439

} else {

1440

int status;

1441

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

1442

perror_plus("waitpid");

1443

free(fullname);

1444

continue;

1445

}

1446

if(WIFEXITED(status)){

1447

if(WEXITSTATUS(status) != 0){

1448

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

1449

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

1450

WEXITSTATUS(status));

1451

free(fullname);

1452

continue;

1453

}

1454

} else if(WIFSIGNALED(status)){

1455

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

1456

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

1457

WTERMSIG(status));

1458

free(fullname);

1459

continue;

1460

} else {

1461

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

1462

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

1463

free(fullname);

1464

continue;

1465

}

1466

}

1467

free(fullname);

1468

if(quit_now){

1469

break;

1470

}

1471

}

1472

close(devnull);

1473

}

1474

return true;

1475

}

1476

1477

1421

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

1478

1422

AvahiSServiceBrowser *sb = NULL;

1479

1423

int error;

1637

1581

argp_state_help(state, state->out_stream,

1638

1582

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

1583

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

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

1584

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

1585

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

1643

1586

exit(argp_err_exit_status);

1644

1587

break;

1645

1588

default:

1690

1633

if(ret == -1){

1691

1634

perror_plus("fstat");

1692

1635

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1636

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

1695

1637

ret = fchown(seckey_fd, uid, gid);

1696

1638

if(ret == -1){

1697

1639

perror_plus("fchown");

1711

1653

if(ret == -1){

1712

1654

perror_plus("fstat");

1713

1655

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1656

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

1716

1657

ret = fchown(pubkey_fd, uid, gid);

1717

1658

if(ret == -1){

1718

1659

perror_plus("fchown");

1731

1672

}

1732

1673

}

1733

1674

1734

/* Run network hooks */

1675

/* Find network hooks and run them */

1735

1676

{

1736

/* Re-raise priviliges */

1737

errno = 0;

1738

ret = seteuid(0);

1739

if(ret == -1){

1740

perror_plus("seteuid");

1741

}

1742

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

1743

goto end;

1744

}

1745

/* Lower privileges */

1746

errno = 0;

1747

ret = seteuid(uid);

1748

if(ret == -1){

1749

perror_plus("seteuid");

1677

struct dirent **direntries;

1678

struct dirent *direntry;

1679

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

1680

alphasort);

1681

if(numhooks == -1){

1682

perror_plus("scandir");

1683

} else {

1684

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

1685

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

1686

direntry = direntries[0];

1687

char *fullname = NULL;

1688

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

1689

if(ret < 0){

1690

perror_plus("asprintf");

1691

continue;

1692

}

1693

pid_t hook_pid = fork();

1694

if(hook_pid == 0){

1695

/* Child */

1696

dup2(devnull, STDIN_FILENO);

1697

close(devnull);

1698

dup2(STDERR_FILENO, STDOUT_FILENO);

1699

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

1700

if(ret == -1){

1701

perror_plus("setenv");

1702

exit(1);

1703

}

1704

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

1705

if(ret == -1){

1706

perror_plus("setenv");

1707

exit(1);

1708

}

1709

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

1710

if(ret == -1){

1711

perror_plus("setenv");

1712

exit(1);

1713

}

1714

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

1715

if(ret == -1){

1716

perror_plus("setenv");

1717

exit(1);

1718

}

1719

char *delaystring;

1720

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

1721

if(ret == -1){

1722

perror_plus("asprintf");

1723

exit(1);

1724

}

1725

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

1726

if(ret == -1){

1727

free(delaystring);

1728

perror_plus("setenv");

1729

exit(1);

1730

}

1731

free(delaystring);

1732

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

1733

perror_plus("execl");

1734

} else {

1735

int status;

1736

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

1737

perror_plus("waitpid");

1738

free(fullname);

1739

continue;

1740

}

1741

if(WIFEXITED(status)){

1742

if(WEXITSTATUS(status) != 0){

1743

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

1744

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

1745

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

1746

WEXITSTATUS(status));

1747

free(fullname);

1748

continue;

1749

}

1750

} else if(WIFSIGNALED(status)){

1751

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

1752

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

1753

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

1754

WTERMSIG(status));

1755

free(fullname);

1756

continue;

1757

} else {

1758

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

1759

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

1760

direntry->d_name);

1761

free(fullname);

1762

continue;

1763

}

1764

}

1765

free(fullname);

1766

if(quit_now){

1767

goto end;

1768

}

1769

}

1770

close(devnull);

1750

1771

}

1751

1772

}

1752

1773

1769

1790

/* Pick the first interface returned */

1770

1791

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

1771

1792

if(debug){

1772

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

1793

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

1794

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

1773

1795

}

1774

1796

if(interface == NULL){

1775

1797

perror_plus("malloc");

1780

1802

free(direntries);

1781

1803

} else {

1782

1804

free(direntries);

1783

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

1805

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

1806

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

1784

1807

exitcode = EXIT_FAILURE;

1785

1808

goto end;

1786

1809

}

1792

1815

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

1793

1816

mc.simple_poll = avahi_simple_poll_new();

1794

1817

if(mc.simple_poll == NULL){

1795

fprintf_plus(stderr,

1796

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

1818

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

1819

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

1797

1820

exitcode = EX_UNAVAILABLE;

1798

1821

goto end;

1799

1822

}

1865

1888

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

1866

1889

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

1890

if(if_index == 0){

1868

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

1891

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

1892

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

1869

1893

exitcode = EX_UNAVAILABLE;

1870

1894

goto end;

1871

1895

}

1991

2015

#endif /* __linux__ */

1992

2016

/* Lower privileges */

1993

2017

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

2018

if(take_down_interface){

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

2023

}

2024

} else {

2025

/* Lower privileges permanently */

2026

ret = setuid(uid);

2027

if(ret == -1){

2028

perror_plus("setuid");

2029

}

1998

2030

}

1999

2031

}

2000

2032

2004

2036

2005

2037

ret = init_gnutls_global(pubkey, seckey);

2006

2038

if(ret == -1){

2007

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

2039

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

2040

"init_gnutls_global failed\n");

2008

2041

exitcode = EX_UNAVAILABLE;

2009

2042

goto end;

2010

2043

} else {

2026

2059

}

2027

2060

2028

2061

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

2029

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

2062

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

2063

"init_gpgme failed\n");

2030

2064

exitcode = EX_UNAVAILABLE;

2031

2065

goto end;

2032

2066

} else {

2042

2076

/* (Mainly meant for debugging) */

2043

2077

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

2044

2078

if(address == NULL){

2045

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

2079

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

2080

"No colon in address\n");

2046

2081

exitcode = EX_USAGE;

2047

2082

goto end;

2048

2083

}

2056

2091

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

2057

2092

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

2058

2093

or tmpmax != (uint16_t)tmpmax){

2059

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

2094

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

2095

"Bad port number\n");

2060

2096

exitcode = EX_USAGE;

2061

2097

goto end;

2062

2098

}

2092

2128

break;

2093

2129

}

2094

2130

if(debug){

2095

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

2096

(int)retry_interval);

2131

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

2132

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

2097

2133

}

2098

2134

sleep((int)retry_interval);

2099

2135

}

2129

2165

2130

2166

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

2131

2167

if(mc.server == NULL){

2132

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

2133

avahi_strerror(error));

2168

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

2169

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

2170

avahi_strerror(error));

2134

2171

exitcode = EX_UNAVAILABLE;

2135

2172

goto end;

2136

2173

}

2144

2181

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

2182

NULL, 0, browse_callback, NULL);

2146

2183

if(sb == NULL){

2147

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

2148

avahi_strerror(avahi_server_errno(mc.server)));

2184

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

2185

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

2186

avahi_strerror(avahi_server_errno(mc.server)));

2149

2187

exitcode = EX_UNAVAILABLE;

2150

2188

goto end;

2151

2189

}

2157

2195

/* Run the main loop */

2158

2196

2159

2197

if(debug){

2160

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

2198

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

2199

"Starting Avahi loop search\n");

2161

2200

}

2162

2201

2163

2202

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

2203

(int)(retry_interval * 1000));

2165

2204

if(debug){

2166

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

2167

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

2205

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

2206

"avahi_loop_with_timeout exited %s\n",

2207

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

2168

2208

}

2169

2209

2170

2210

end:

2171

2211

2172

2212

if(debug){

2173

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

2213

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

2214

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

2174

2215

}

2175

2216

2176

2217

/* Cleanup things */

2204

2245

}

2205

2246

}

2206

2247

2207

/* Re-raise priviliges */

2208

{

2248

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

2249

2250

/* Take down the network interface */

2251

if(take_down_interface){

2252

/* Re-raise priviliges */

2209

2253

errno = 0;

2210

2254

ret = seteuid(0);

2211

2255

if(ret == -1){

2212

2256

perror_plus("seteuid");

2213

2257

}

2214

/* Run network hooks */

2215

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

2216

goto end;

2217

}

2218

2219

/* Take down the network interface */

2220

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

2258

if(geteuid() == 0){

2221

2259

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

2222

2260

if(ret == -1){

2223

2261

perror_plus("ioctl SIOCGIFFLAGS");

2232

2270

if(ret == -1){

2233

2271

perror_plus("close");

2234

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2235

2279

}

2236

2280

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2243

2281

2244

2282

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

2245

2283

if(tempdir_created){

2259

2297

}

2260

2298

ret = remove(fullname);

2261

2299

if(ret == -1){

2262

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

2263

strerror(errno));

2300

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

2301

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

2264

2302

}

2265

2303

free(fullname);

2266

2304

}