/mandos/release : revision 237.16.6

174

perror(print_text);

175

}

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

185

186

177

/*

187

178

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

188

179

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

262

253

263

254

rc = gpgme_data_new_from_fd(&pgp_data, fd);

264

255

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));

256

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

257

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

258

gpgme_strsource(rc), gpgme_strerror(rc));

267

259

return false;

268

260

}

269

261

270

262

rc = gpgme_op_import(mc.ctx, pgp_data);

271

263

if(rc != GPG_ERR_NO_ERROR){

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

264

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

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

274

267

return false;

275

268

}

276

269

283

276

}

284

277

285

278

if(debug){

286

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

279

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

280

"Initializing GPGME\n");

287

281

}

288

282

289

283

/* Init GPGME */

290

284

gpgme_check_version(NULL);

291

285

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

292

286

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));

287

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

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

295

290

return false;

296

291

}

297

292

298

293

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

299

294

rc = gpgme_get_engine_info(&engine_info);

300

295

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));

296

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

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

303

299

return false;

304

300

}

305

301

while(engine_info != NULL){

311

307

engine_info = engine_info->next;

312

308

}

313

309

if(engine_info == NULL){

314

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

315

tempdir);

310

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

311

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

316

312

return false;

317

313

}

318

314

319

315

/* Create new GPGME "context" */

320

316

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

321

317

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));

318

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

319

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

320

gpgme_strerror(rc));

325

321

return false;

326

322

}

327

323

346

342

ssize_t plaintext_length = 0;

347

343

348

344

if(debug){

349

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

345

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

346

"Trying to decrypt OpenPGP data\n");

350

347

}

351

348

352

349

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

353

350

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

354

351

0);

355

352

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));

353

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

354

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

355

gpgme_strsource(rc), gpgme_strerror(rc));

358

356

return -1;

359

357

}

360

358

361

359

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

362

360

rc = gpgme_data_new(&dh_plain);

363

361

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));

362

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

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

367

365

gpgme_data_release(dh_crypto);

368

366

return -1;

369

367

}

372

370

data buffer */

373

371

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

374

372

if(rc != GPG_ERR_NO_ERROR){

375

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

376

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));

377

376

plaintext_length = -1;

378

377

if(debug){

379

378

gpgme_decrypt_result_t result;

380

379

result = gpgme_op_decrypt_result(mc.ctx);

381

380

if(result == NULL){

382

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

381

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

382

"gpgme_op_decrypt_result failed\n");

383

} 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);

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);

388

390

if(result->file_name != NULL){

389

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);

390

393

}

391

394

gpgme_recipient_t recipient;

392

395

recipient = result->recipients;

393

396

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");

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");

401

406

recipient = recipient->next;

402

407

}

403

408

}

406

411

}

407

412

408

413

if(debug){

409

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

414

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

415

"Decryption of OpenPGP data succeeded\n");

410

416

}

411

417

412

418

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

443

449

}

444

450

445

451

if(debug){

446

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

452

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

453

"Decrypted password is: ");

447

454

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

448

455

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

449

456

}

471

478

/* GnuTLS log function callback */

472

479

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

473

480

const char* string){

474

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

481

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

475

482

}

476

483

477

484

static int init_gnutls_global(const char *pubkeyfilename,

479

486

int ret;

480

487

481

488

if(debug){

482

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

489

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

490

"Initializing GnuTLS\n");

483

491

}

484

492

485

493

ret = gnutls_global_init();

486

494

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

495

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

496

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

489

497

return -1;

490

498

}

491

499

500

508

/* OpenPGP credentials */

501

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

502

510

if(ret != GNUTLS_E_SUCCESS){

503

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

504

safer_gnutls_strerror(ret));

511

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

512

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

505

513

gnutls_global_deinit();

506

514

return -1;

507

515

}

508

516

509

517

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);

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);

514

522

}

515

523

516

524

ret = gnutls_certificate_set_openpgp_key_file

517

525

(mc.cred, pubkeyfilename, seckeyfilename,

518

526

GNUTLS_OPENPGP_FMT_BASE64);

519

527

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));

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));

525

534

goto globalfail;

526

535

}

527

536

528

537

/* GnuTLS server initialization */

529

538

ret = gnutls_dh_params_init(&mc.dh_params);

530

539

if(ret != GNUTLS_E_SUCCESS){

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

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));

534

543

goto globalfail;

535

544

}

536

545

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

537

546

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

547

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

548

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

549

safer_gnutls_strerror(ret));

540

550

goto globalfail;

541

551

}

542

552

562

572

}

563

573

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

564

574

if(ret != GNUTLS_E_SUCCESS){

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

575

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

576

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

577

safer_gnutls_strerror(ret));

568

578

}

569

579

570

580

{

577

587

}

578

588

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

579

589

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));

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));

583

594

gnutls_deinit(*session);

584

595

return -1;

585

596

}

594

605

}

595

606

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

596

607

if(ret != GNUTLS_E_SUCCESS){

597

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

598

safer_gnutls_strerror(ret));

608

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

609

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

610

safer_gnutls_strerror(ret));

599

611

gnutls_deinit(*session);

600

612

return -1;

601

613

}

646

658

pf = PF_INET;

647

659

break;

648

660

default:

649

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

661

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

662

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

650

663

errno = EINVAL;

651

664

return -1;

652

665

}

657

670

}

658

671

659

672

if(debug){

660

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

661

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);

662

676

}

663

677

664

678

tcp_sd = socket(pf, SOCK_STREAM, 0);

690

704

}

691

705

if(ret == 0){

692

706

int e = errno;

693

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

707

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

708

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

694

709

errno = e;

695

710

goto mandos_end;

696

711

}

703

718

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

704

719

-Wunreachable-code*/

705

720

if(if_index == AVAHI_IF_UNSPEC){

706

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

707

" 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");

708

724

errno = EINVAL;

709

725

goto mandos_end;

710

726

}

728

744

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

729

745

perror_plus("if_indextoname");

730

746

} else {

731

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

732

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

747

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

748

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

749

ip, interface, port);

733

750

}

734

751

} else {

735

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

736

ip, port);

752

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

753

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

737

754

}

738

755

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

739

756

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

749

766

perror_plus("inet_ntop");

750

767

} else {

751

768

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

752

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

769

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

770

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

753

771

}

754

772

}

755

773

}

809

827

}

810

828

811

829

if(debug){

812

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);

813

832

}

814

833

815

834

if(quit_now){

835

854

836

855

if(ret != GNUTLS_E_SUCCESS){

837

856

if(debug){

838

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

857

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

858

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

839

859

gnutls_perror(ret);

840

860

}

841

861

errno = EPROTO;

845

865

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

846

866

847

867

if(debug){

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

868

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

869

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

850

870

}

851

871

852

872

while(true){

890

910

}

891

911

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

892

912

if(ret < 0){

893

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

894

"***\n");

913

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

914

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

895

915

gnutls_perror(ret);

896

916

errno = EPROTO;

897

917

goto mandos_end;

898

918

}

899

919

break;

900

920

default:

901

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

902

" 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");

903

924

gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

925

errno = EIO;

905

926

goto mandos_end;

910

931

}

911

932

912

933

if(debug){

913

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

934

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

935

"Closing TLS session\n");

914

936

}

915

937

916

938

if(quit_now){

945

967

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

946

968

int e = errno;

947

969

if(debug){

948

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

949

strerror(errno));

970

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

971

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

972

strerror(errno));

950

973

}

951

974

errno = e;

952

975

goto mandos_end;

1009

1032

switch(event){

1010

1033

default:

1011

1034

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)));

1035

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

1036

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

1037

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

1038

avahi_strerror(avahi_server_errno(mc.server)));

1016

1039

break;

1017

1040

1018

1041

case AVAHI_RESOLVER_FOUND:

1020

1043

char ip[AVAHI_ADDRESS_STR_MAX];

1021

1044

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

1022

1045

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);

1046

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

1047

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

1048

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

1049

ip, (intmax_t)interface, port);

1026

1050

}

1027

1051

int ret = start_mandos_communication(ip, port, interface,

1028

1052

avahi_proto_to_af(proto));

1060

1084

default:

1061

1085

case AVAHI_BROWSER_FAILURE:

1062

1086

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1087

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

1088

"(Avahi browser) %s\n",

1089

avahi_strerror(avahi_server_errno(mc.server)));

1065

1090

avahi_simple_poll_quit(mc.simple_poll);

1066

1091

return;

1067

1092

1074

1099

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

1075

1100

name, type, domain, protocol, 0,

1076

1101

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)));

1102

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

1103

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

1104

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

1080

1105

break;

1081

1106

1082

1107

case AVAHI_BROWSER_REMOVE:

1085

1110

case AVAHI_BROWSER_ALL_FOR_NOW:

1086

1111

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1087

1112

if(debug){

1088

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

1089

" searching...\n");

1113

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

1114

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

1090

1115

}

1091

1116

break;

1092

1117

}

1131

1156

/* Reject the loopback device */

1132

1157

if(ifr->ifr_flags & IFF_LOOPBACK){

1133

1158

if(debug){

1134

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

1135

ifname);

1159

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

1160

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

1136

1161

}

1137

1162

return false;

1138

1163

}

1139

1164

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

1140

1165

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

1141

1166

if(debug){

1142

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

1143

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

1167

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

1168

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

1144

1169

}

1145

1170

return true;

1146

1171

}

1147

1172

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

1148

1173

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

1149

1174

if(debug){

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1175

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

1176

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

1152

1177

}

1153

1178

return false;

1154

1179

}

1155

1180

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

1156

1181

if(ifr->ifr_flags & IFF_NOARP){

1157

1182

if(debug){

1158

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

1159

ifname);

1183

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

1184

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

1160

1185

}

1161

1186

return false;

1162

1187

}

1163

1188

1164

1189

/* Accept this device */

1165

1190

if(debug){

1166

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

1191

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

1192

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

1167

1193

}

1168

1194

return true;

1169

1195

}

1181

1207

struct ifreq ifr;

1182

1208

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

1183

1209

if(debug){

1184

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

1185

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

1210

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

1211

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

1212

if_entry->d_name);

1186

1213

}

1187

1214

return 0;

1188

1215

}

1206

1233

struct ifreq ifr;

1207

1234

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

1208

1235

if(debug){

1209

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

1210

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

1236

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

1237

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

1238

if_entry->d_name);

1211

1239

}

1212

1240

return 0;

1213

1241

}

1215

1243

/* Reject down interfaces */

1216

1244

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

1217

1245

if(debug){

1218

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

1219

if_entry->d_name);

1246

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

1247

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

1248

if_entry->d_name);

1220

1249

}

1221

1250

return 0;

1222

1251

}

1224

1253

/* Reject non-running interfaces */

1225

1254

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

1226

1255

if(debug){

1227

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

1228

if_entry->d_name);

1256

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

1257

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

1258

if_entry->d_name);

1229

1259

}

1230

1260

return 0;

1231

1261

}

1265

1295

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

1266

1296

/* Contains non-allowed characters */

1267

1297

if(debug){

1268

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

1269

direntry->d_name);

1298

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

1299

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

1300

direntry->d_name);

1270

1301

}

1271

1302

return 0;

1272

1303

}

1288

1319

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

1289

1320

/* Not a regular file */

1290

1321

if(debug){

1291

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

1292

direntry->d_name);

1322

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

1323

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

1324

direntry->d_name);

1293

1325

}

1294

1326

return 0;

1295

1327

}

1296

1328

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

1297

1329

/* Not executable */

1298

1330

if(debug){

1299

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

1300

direntry->d_name);

1331

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

1332

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

1333

direntry->d_name);

1301

1334

}

1302

1335

return 0;

1303

1336

}

1313

1346

while(true){

1314

1347

if(mc.current_server == NULL){

1315

1348

if (debug){

1316

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

1317

" No timeout!\n");

1349

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

1350

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

1318

1351

}

1319

1352

ret = avahi_simple_poll_iterate(s, -1);

1320

1353

} else {

1321

1354

if (debug){

1322

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

1323

" it, or wait\n");

1355

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

1356

"Check current_server if we should run it,"

1357

" or wait\n");

1324

1358

}

1325

1359

/* the current time */

1326

1360

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1342

1376

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

1343

1377

1344

1378

if (debug){

1345

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

1346

block_time);

1379

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

1380

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

1347

1381

}

1348

1382

1349

1383

if(block_time <= 0){

1376

1410

}

1377

1411

}

1378

1412

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

1413

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

1478

1414

AvahiSServiceBrowser *sb = NULL;

1479

1415

int error;

1637

1573

argp_state_help(state, state->out_stream,

1638

1574

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1639

1575

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);

1576

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

1577

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

1643

1578

exit(argp_err_exit_status);

1644

1579

break;

1645

1580

default:

1690

1625

if(ret == -1){

1691

1626

perror_plus("fstat");

1692

1627

} else {

1693

if(S_ISREG(st.st_mode)

1694

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

1628

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

1695

1629

ret = fchown(seckey_fd, uid, gid);

1696

1630

if(ret == -1){

1697

1631

perror_plus("fchown");

1711

1645

if(ret == -1){

1712

1646

perror_plus("fstat");

1713

1647

} else {

1714

if(S_ISREG(st.st_mode)

1715

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

1648

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

1716

1649

ret = fchown(pubkey_fd, uid, gid);

1717

1650

if(ret == -1){

1718

1651

perror_plus("fchown");

1731

1664

}

1732

1665

}

1733

1666

1734

/* Run network hooks */

1667

/* Find network hooks and run them */

1735

1668

{

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");

1669

struct dirent **direntries;

1670

struct dirent *direntry;

1671

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

1672

alphasort);

1673

if(numhooks == -1){

1674

perror_plus("scandir");

1675

} else {

1676

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

1677

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

1678

direntry = direntries[0];

1679

char *fullname = NULL;

1680

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

1681

if(ret < 0){

1682

perror_plus("asprintf");

1683

continue;

1684

}

1685

pid_t hook_pid = fork();

1686

if(hook_pid == 0){

1687

/* Child */

1688

dup2(devnull, STDIN_FILENO);

1689

close(devnull);

1690

dup2(STDERR_FILENO, STDOUT_FILENO);

1691

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

1692

if(ret == -1){

1693

perror_plus("setenv");

1694

exit(1);

1695

}

1696

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

1697

if(ret == -1){

1698

perror_plus("setenv");

1699

exit(1);

1700

}

1701

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

1702

if(ret == -1){

1703

perror_plus("setenv");

1704

exit(1);

1705

}

1706

char *delaystring;

1707

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

1708

if(ret == -1){

1709

perror_plus("asprintf");

1710

exit(1);

1711

}

1712

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

1713

if(ret == -1){

1714

free(delaystring);

1715

perror_plus("setenv");

1716

exit(1);

1717

}

1718

free(delaystring);

1719

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

1720

perror_plus("execl");

1721

} else {

1722

int status;

1723

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

1724

perror_plus("waitpid");

1725

free(fullname);

1726

continue;

1727

}

1728

if(WIFEXITED(status)){

1729

if(WEXITSTATUS(status) != 0){

1730

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

1731

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

1732

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

1733

WEXITSTATUS(status));

1734

free(fullname);

1735

continue;

1736

}

1737

} else if(WIFSIGNALED(status)){

1738

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

1739

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

1740

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

1741

WTERMSIG(status));

1742

free(fullname);

1743

continue;

1744

} else {

1745

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

1746

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

1747

direntry->d_name);

1748

free(fullname);

1749

continue;

1750

}

1751

}

1752

free(fullname);

1753

if(quit_now){

1754

goto end;

1755

}

1756

}

1757

close(devnull);

1750

1758

}

1751

1759

}

1752

1760

1769

1777

/* Pick the first interface returned */

1770

1778

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

1771

1779

if(debug){

1772

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

1780

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

1781

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

1773

1782

}

1774

1783

if(interface == NULL){

1775

1784

perror_plus("malloc");

1780

1789

free(direntries);

1781

1790

} else {

1782

1791

free(direntries);

1783

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

1792

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

1793

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

1784

1794

exitcode = EXIT_FAILURE;

1785

1795

goto end;

1786

1796

}

1792

1802

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

1793

1803

mc.simple_poll = avahi_simple_poll_new();

1794

1804

if(mc.simple_poll == NULL){

1795

fprintf_plus(stderr,

1796

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

1805

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

1806

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

1797

1807

exitcode = EX_UNAVAILABLE;

1798

1808

goto end;

1799

1809

}

1865

1875

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

1866

1876

if_index = (AvahiIfIndex) if_nametoindex(interface);

1867

1877

if(if_index == 0){

1868

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

1878

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

1879

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

1869

1880

exitcode = EX_UNAVAILABLE;

1870

1881

goto end;

1871

1882

}

1991

2002

#endif /* __linux__ */

1992

2003

/* Lower privileges */

1993

2004

errno = 0;

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

2005

if(take_down_interface){

2006

/* Lower privileges */

2007

ret = seteuid(uid);

2008

if(ret == -1){

2009

perror_plus("seteuid");

2010

}

2011

} else {

2012

/* Lower privileges permanently */

2013

ret = setuid(uid);

2014

if(ret == -1){

2015

perror_plus("setuid");

2016

}

1998

2017

}

1999

2018

}

2000

2019

2004

2023

2005

2024

ret = init_gnutls_global(pubkey, seckey);

2006

2025

if(ret == -1){

2007

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

2026

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

2027

"init_gnutls_global failed\n");

2008

2028

exitcode = EX_UNAVAILABLE;

2009

2029

goto end;

2010

2030

} else {

2026

2046

}

2027

2047

2028

2048

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

2029

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

2049

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

2050

"init_gpgme failed\n");

2030

2051

exitcode = EX_UNAVAILABLE;

2031

2052

goto end;

2032

2053

} else {

2042

2063

/* (Mainly meant for debugging) */

2043

2064

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

2044

2065

if(address == NULL){

2045

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

2066

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

2067

"No colon in address\n");

2046

2068

exitcode = EX_USAGE;

2047

2069

goto end;

2048

2070

}

2056

2078

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

2057

2079

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

2058

2080

or tmpmax != (uint16_t)tmpmax){

2059

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

2081

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

2082

"Bad port number\n");

2060

2083

exitcode = EX_USAGE;

2061

2084

goto end;

2062

2085

}

2092

2115

break;

2093

2116

}

2094

2117

if(debug){

2095

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

2096

(int)retry_interval);

2118

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

2119

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

2097

2120

}

2098

2121

sleep((int)retry_interval);

2099

2122

}

2129

2152

2130

2153

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

2131

2154

if(mc.server == NULL){

2132

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

2133

avahi_strerror(error));

2155

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

2156

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

2157

avahi_strerror(error));

2134

2158

exitcode = EX_UNAVAILABLE;

2135

2159

goto end;

2136

2160

}

2144

2168

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2145

2169

NULL, 0, browse_callback, NULL);

2146

2170

if(sb == NULL){

2147

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

2148

avahi_strerror(avahi_server_errno(mc.server)));

2171

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

2172

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

2173

avahi_strerror(avahi_server_errno(mc.server)));

2149

2174

exitcode = EX_UNAVAILABLE;

2150

2175

goto end;

2151

2176

}

2157

2182

/* Run the main loop */

2158

2183

2159

2184

if(debug){

2160

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

2185

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

2186

"Starting Avahi loop search\n");

2161

2187

}

2162

2188

2163

2189

ret = avahi_loop_with_timeout(mc.simple_poll,

2164

2190

(int)(retry_interval * 1000));

2165

2191

if(debug){

2166

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

2167

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

2192

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

2193

"avahi_loop_with_timeout exited %s\n",

2194

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

2168

2195

}

2169

2196

2170

2197

end:

2171

2198

2172

2199

if(debug){

2173

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

2200

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

2201

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

2174

2202

}

2175

2203

2176

2204

/* Cleanup things */

2204

2232

}

2205

2233

}

2206

2234

2207

/* Re-raise priviliges */

2208

{

2235

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

2236

2237

/* Take down the network interface */

2238

if(take_down_interface){

2239

/* Re-raise priviliges */

2209

2240

errno = 0;

2210

2241

ret = seteuid(0);

2211

2242

if(ret == -1){

2212

2243

perror_plus("seteuid");

2213

2244

}

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){

2245

if(geteuid() == 0){

2221

2246

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

2222

2247

if(ret == -1){

2223

2248

perror_plus("ioctl SIOCGIFFLAGS");

2232

2257

if(ret == -1){

2233

2258

perror_plus("close");

2234

2259

}

2260

/* Lower privileges permanently */

2261

errno = 0;

2262

ret = setuid(uid);

2263

if(ret == -1){

2264

perror_plus("setuid");

2265

}

2235

2266

}

2236

2267

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2243

2268

2244

2269

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

2245

2270

if(tempdir_created){

2259

2284

}

2260

2285

ret = remove(fullname);

2261

2286

if(ret == -1){

2262

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

2263

strerror(errno));

2287

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

2288

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

2264

2289

}

2265

2290

free(fullname);

2266

2291

}