/mandos/trunk : revision 505.3.9

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

177

186

/*

178

187

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

179

188

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

253

262

254

263

rc = gpgme_data_new_from_fd(&pgp_data, fd);

255

264

if(rc != GPG_ERR_NO_ERROR){

256

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

257

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

258

gpgme_strsource(rc), gpgme_strerror(rc));

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

259

267

return false;

260

268

}

261

269

262

270

rc = gpgme_op_import(mc.ctx, pgp_data);

263

271

if(rc != GPG_ERR_NO_ERROR){

264

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

265

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

266

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

267

274

return false;

268

275

}

269

276

283

}

277

284

278

285

if(debug){

279

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

280

"Initializing GPGME\n");

286

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

281

287

}

282

288

283

289

/* Init GPGME */

284

290

gpgme_check_version(NULL);

285

291

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

286

292

if(rc != GPG_ERR_NO_ERROR){

287

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

288

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

289

gpgme_strsource(rc), gpgme_strerror(rc));

293

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

294

gpgme_strsource(rc), gpgme_strerror(rc));

290

295

return false;

291

296

}

292

297

293

298

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

294

299

rc = gpgme_get_engine_info(&engine_info);

295

300

if(rc != GPG_ERR_NO_ERROR){

296

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

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

301

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

302

gpgme_strsource(rc), gpgme_strerror(rc));

299

303

return false;

300

304

}

301

305

while(engine_info != NULL){

307

311

engine_info = engine_info->next;

308

312

}

309

313

if(engine_info == NULL){

310

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

311

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

314

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

315

tempdir);

312

316

return false;

313

317

}

314

318

315

319

/* Create new GPGME "context" */

316

320

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

317

321

if(rc != GPG_ERR_NO_ERROR){

318

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

319

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

320

gpgme_strerror(rc));

322

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

323

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

324

gpgme_strerror(rc));

321

325

return false;

322

326

}

323

327

342

346

ssize_t plaintext_length = 0;

343

347

344

348

if(debug){

345

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

346

"Trying to decrypt OpenPGP data\n");

349

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

347

350

}

348

351

349

352

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

350

353

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

351

354

0);

352

355

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

355

gpgme_strsource(rc), gpgme_strerror(rc));

356

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

357

gpgme_strsource(rc), gpgme_strerror(rc));

356

358

return -1;

357

359

}

358

360

359

361

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

360

362

rc = gpgme_data_new(&dh_plain);

361

363

if(rc != GPG_ERR_NO_ERROR){

362

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

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

364

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

365

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

366

gpgme_strsource(rc), gpgme_strerror(rc));

365

367

gpgme_data_release(dh_crypto);

366

368

return -1;

367

369

}

370

372

data buffer */

371

373

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

372

374

if(rc != GPG_ERR_NO_ERROR){

373

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

374

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

375

gpgme_strsource(rc), gpgme_strerror(rc));

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

376

377

plaintext_length = -1;

377

378

if(debug){

378

379

gpgme_decrypt_result_t result;

379

380

result = gpgme_op_decrypt_result(mc.ctx);

380

381

if(result == NULL){

381

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

382

"gpgme_op_decrypt_result failed\n");

382

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

383

} else {

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);

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);

390

388

if(result->file_name != NULL){

391

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

392

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

389

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

393

390

}

394

391

gpgme_recipient_t recipient;

395

392

recipient = result->recipients;

396

393

while(recipient != NULL){

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");

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");

406

401

recipient = recipient->next;

407

402

}

408

403

}

411

406

}

412

407

413

408

if(debug){

414

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

415

"Decryption of OpenPGP data succeeded\n");

409

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

416

410

}

417

411

418

412

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

449

443

}

450

444

451

445

if(debug){

452

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

453

"Decrypted password is: ");

446

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

454

447

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

455

448

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

456

449

}

478

471

/* GnuTLS log function callback */

479

472

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

480

473

const char* string){

481

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

474

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

482

475

}

483

476

484

477

static int init_gnutls_global(const char *pubkeyfilename,

486

479

int ret;

487

480

488

481

if(debug){

489

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

490

"Initializing GnuTLS\n");

482

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

491

483

}

492

484

493

485

ret = gnutls_global_init();

494

486

if(ret != GNUTLS_E_SUCCESS){

495

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

496

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

487

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

488

safer_gnutls_strerror(ret));

497

489

return -1;

498

490

}

499

491

508

500

/* OpenPGP credentials */

509

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

510

502

if(ret != GNUTLS_E_SUCCESS){

511

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

512

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

503

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

504

safer_gnutls_strerror(ret));

513

505

gnutls_global_deinit();

514

506

return -1;

515

507

}

516

508

517

509

if(debug){

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);

510

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

511

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

512

pubkeyfilename,

513

seckeyfilename);

522

514

}

523

515

524

516

ret = gnutls_certificate_set_openpgp_key_file

525

517

(mc.cred, pubkeyfilename, seckeyfilename,

526

518

GNUTLS_OPENPGP_FMT_BASE64);

527

519

if(ret != GNUTLS_E_SUCCESS){

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));

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));

534

525

goto globalfail;

535

526

}

536

527

537

528

/* GnuTLS server initialization */

538

529

ret = gnutls_dh_params_init(&mc.dh_params);

539

530

if(ret != GNUTLS_E_SUCCESS){

540

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

541

"Error in GnuTLS DH parameter initialization:"

542

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

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

543

534

goto globalfail;

544

535

}

545

536

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

546

537

if(ret != GNUTLS_E_SUCCESS){

547

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

548

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

549

safer_gnutls_strerror(ret));

538

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

539

safer_gnutls_strerror(ret));

550

540

goto globalfail;

551

541

}

552

542

572

562

}

573

563

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

574

564

if(ret != GNUTLS_E_SUCCESS){

575

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

576

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

577

safer_gnutls_strerror(ret));

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

578

568

}

579

569

580

570

{

587

577

}

588

578

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

589

579

if(ret != GNUTLS_E_SUCCESS){

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));

580

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

581

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

582

safer_gnutls_strerror(ret));

594

583

gnutls_deinit(*session);

595

584

return -1;

596

585

}

605

594

}

606

595

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

607

596

if(ret != GNUTLS_E_SUCCESS){

608

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

609

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

610

safer_gnutls_strerror(ret));

597

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

598

safer_gnutls_strerror(ret));

611

599

gnutls_deinit(*session);

612

600

return -1;

613

601

}

658

646

pf = PF_INET;

659

647

break;

660

648

default:

661

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

662

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

649

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

663

650

errno = EINVAL;

664

651

return -1;

665

652

}

670

657

}

671

658

672

659

if(debug){

673

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

674

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

675

"\n", ip, port);

660

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

661

PRIu16 "\n", ip, port);

676

662

}

677

663

678

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

704

690

}

705

691

if(ret == 0){

706

692

int e = errno;

707

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

708

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

693

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

709

694

errno = e;

710

695

goto mandos_end;

711

696

}

718

703

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

719

704

-Wunreachable-code*/

720

705

if(if_index == AVAHI_IF_UNSPEC){

721

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

722

"An IPv6 link-local address is incomplete"

723

" without a network interface\n");

706

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

707

" incomplete without a network interface\n");

724

708

errno = EINVAL;

725

709

goto mandos_end;

726

710

}

744

728

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

745

729

perror_plus("if_indextoname");

746

730

} else {

747

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

748

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

749

ip, interface, port);

731

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

732

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

750

733

}

751

734

} else {

752

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

753

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

735

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

736

ip, port);

754

737

}

755

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

756

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

766

749

perror_plus("inet_ntop");

767

750

} else {

768

751

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

769

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

770

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

752

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

771

753

}

772

754

}

773

755

}

827

809

}

828

810

829

811

if(debug){

830

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

831

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

812

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

832

813

}

833

814

834

815

if(quit_now){

854

835

855

836

if(ret != GNUTLS_E_SUCCESS){

856

837

if(debug){

857

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

858

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

838

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

859

839

gnutls_perror(ret);

860

840

}

861

841

errno = EPROTO;

865

845

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

866

846

867

847

if(debug){

868

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

869

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

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

870

850

}

871

851

872

852

while(true){

910

890

}

911

891

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

912

892

if(ret < 0){

913

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

914

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

893

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

894

"***\n");

915

895

gnutls_perror(ret);

916

896

errno = EPROTO;

917

897

goto mandos_end;

918

898

}

919

899

break;

920

900

default:

921

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

922

"Unknown error while reading data from"

923

" encrypted session with Mandos server\n");

901

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

902

" encrypted session with Mandos server\n");

924

903

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

904

errno = EIO;

926

905

goto mandos_end;

931

910

}

932

911

933

912

if(debug){

934

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

935

"Closing TLS session\n");

913

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

936

914

}

937

915

938

916

if(quit_now){

967

945

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

968

946

int e = errno;

969

947

if(debug){

970

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

971

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

972

strerror(errno));

948

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

949

strerror(errno));

973

950

}

974

951

errno = e;

975

952

goto mandos_end;

1032

1009

switch(event){

1033

1010

default:

1034

1011

case AVAHI_RESOLVER_FAILURE:

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)));

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)));

1039

1016

break;

1040

1017

1041

1018

case AVAHI_RESOLVER_FOUND:

1043

1020

char ip[AVAHI_ADDRESS_STR_MAX];

1044

1021

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

1045

1022

if(debug){

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);

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);

1050

1026

}

1051

1027

int ret = start_mandos_communication(ip, port, interface,

1052

1028

avahi_proto_to_af(proto));

1084

1060

default:

1085

1061

case AVAHI_BROWSER_FAILURE:

1086

1062

1087

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

1088

"(Avahi browser) %s\n",

1089

avahi_strerror(avahi_server_errno(mc.server)));

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1090

1065

avahi_simple_poll_quit(mc.simple_poll);

1091

1066

return;

1092

1067

1099

1074

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

1100

1075

name, type, domain, protocol, 0,

1101

1076

resolve_callback, NULL) == NULL)

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)));

1077

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

1078

" %s\n", name,

1079

avahi_strerror(avahi_server_errno(mc.server)));

1105

1080

break;

1106

1081

1107

1082

case AVAHI_BROWSER_REMOVE:

1110

1085

case AVAHI_BROWSER_ALL_FOR_NOW:

1111

1086

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1112

1087

if(debug){

1113

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

1114

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

1088

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

1089

" searching...\n");

1115

1090

}

1116

1091

break;

1117

1092

}

1156

1131

/* Reject the loopback device */

1157

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1158

1133

if(debug){

1159

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

1160

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

1134

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

1135

ifname);

1161

1136

}

1162

1137

return false;

1163

1138

}

1164

1139

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

1165

1140

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

1166

1141

if(debug){

1167

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

1168

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

1142

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

1143

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

1169

1144

}

1170

1145

return true;

1171

1146

}

1172

1147

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

1173

1148

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

1174

1149

if(debug){

1175

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

1176

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

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1177

1152

}

1178

1153

return false;

1179

1154

}

1180

1155

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

1181

1156

if(ifr->ifr_flags & IFF_NOARP){

1182

1157

if(debug){

1183

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

1184

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

1158

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

1159

ifname);

1185

1160

}

1186

1161

return false;

1187

1162

}

1188

1163

1189

1164

/* Accept this device */

1190

1165

if(debug){

1191

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

1192

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

1166

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

1193

1167

}

1194

1168

return true;

1195

1169

}

1207

1181

struct ifreq ifr;

1208

1182

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

1209

1183

if(debug){

1210

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

1211

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

1212

if_entry->d_name);

1184

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

1185

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

1213

1186

}

1214

1187

return 0;

1215

1188

}

1233

1206

struct ifreq ifr;

1234

1207

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

1235

1208

if(debug){

1236

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

1237

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

1238

if_entry->d_name);

1209

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

1210

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

1239

1211

}

1240

1212

return 0;

1241

1213

}

1243

1215

/* Reject down interfaces */

1244

1216

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

1245

1217

if(debug){

1246

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

1247

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

1248

if_entry->d_name);

1218

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

1219

if_entry->d_name);

1249

1220

}

1250

1221

return 0;

1251

1222

}

1253

1224

/* Reject non-running interfaces */

1254

1225

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

1255

1226

if(debug){

1256

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

1257

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

1258

if_entry->d_name);

1227

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

1228

if_entry->d_name);

1259

1229

}

1260

1230

return 0;

1261

1231

}

1295

1265

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

1296

1266

/* Contains non-allowed characters */

1297

1267

if(debug){

1298

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

1299

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

1300

direntry->d_name);

1268

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

1269

direntry->d_name);

1301

1270

}

1302

1271

return 0;

1303

1272

}

1319

1288

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

1320

1289

/* Not a regular file */

1321

1290

if(debug){

1322

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

1323

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

1324

direntry->d_name);

1291

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

1292

direntry->d_name);

1325

1293

}

1326

1294

return 0;

1327

1295

}

1328

1296

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

1329

1297

/* Not executable */

1330

1298

if(debug){

1331

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

1332

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

1333

direntry->d_name);

1299

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

1300

direntry->d_name);

1334

1301

}

1335

1302

return 0;

1336

1303

}

1346

1313

while(true){

1347

1314

if(mc.current_server == NULL){

1348

1315

if (debug){

1349

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

1350

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

1316

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

1317

" No timeout!\n");

1351

1318

}

1352

1319

ret = avahi_simple_poll_iterate(s, -1);

1353

1320

} else {

1354

1321

if (debug){

1355

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

1356

"Check current_server if we should run it,"

1357

" or wait\n");

1322

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

1323

" it, or wait\n");

1358

1324

}

1359

1325

/* the current time */

1360

1326

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1376

1342

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

1377

1343

1378

1344

if (debug){

1379

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

1380

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

1345

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

1346

block_time);

1381

1347

}

1382

1348

1383

1349

if(block_time <= 0){

1410

1376

}

1411

1377

}

1412

1378

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

1413

1477

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

1414

1478

AvahiSServiceBrowser *sb = NULL;

1415

1479

int error;

1573

1637

argp_state_help(state, state->out_stream,

1574

1638

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1575

1639

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

1576

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

1577

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

1640

fprintf_plus(state->out_stream,

1641

"Mandos plugin mandos-client: ");

1642

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

1578

1643

exit(argp_err_exit_status);

1579

1644

break;

1580

1645

default:

1625

1690

if(ret == -1){

1626

1691

perror_plus("fstat");

1627

1692

} else {

1628

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

1693

if(S_ISREG(st.st_mode)

1694

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

1629

1695

ret = fchown(seckey_fd, uid, gid);

1630

1696

if(ret == -1){

1631

1697

perror_plus("fchown");

1645

1711

if(ret == -1){

1646

1712

perror_plus("fstat");

1647

1713

} else {

1648

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

1714

if(S_ISREG(st.st_mode)

1715

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

1649

1716

ret = fchown(pubkey_fd, uid, gid);

1650

1717

if(ret == -1){

1651

1718

perror_plus("fchown");

1664

1731

}

1665

1732

}

1666

1733

1667

/* Find network hooks and run them */

1734

/* Run network hooks */

1668

1735

{

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);

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");

1758

1750

}

1759

1751

}

1760

1752

1777

1769

/* Pick the first interface returned */

1778

1770

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

1779

1771

if(debug){

1780

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

1781

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

1772

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

1782

1773

}

1783

1774

if(interface == NULL){

1784

1775

perror_plus("malloc");

1789

1780

free(direntries);

1790

1781

} else {

1791

1782

free(direntries);

1792

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

1793

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

1783

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

1794

1784

exitcode = EXIT_FAILURE;

1795

1785

goto end;

1796

1786

}

1802

1792

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

1803

1793

mc.simple_poll = avahi_simple_poll_new();

1804

1794

if(mc.simple_poll == NULL){

1805

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

1806

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

1795

fprintf_plus(stderr,

1796

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

1807

1797

exitcode = EX_UNAVAILABLE;

1808

1798

goto end;

1809

1799

}

1875

1865

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

1876

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1877

1867

if(if_index == 0){

1878

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

1879

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

1868

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

1880

1869

exitcode = EX_UNAVAILABLE;

1881

1870

goto end;

1882

1871

}

2002

1991

#endif /* __linux__ */

2003

1992

/* Lower privileges */

2004

1993

errno = 0;

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

}

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

2017

1998

}

2018

1999

}

2019

2000

2023

2004

2024

2005

ret = init_gnutls_global(pubkey, seckey);

2025

2006

if(ret == -1){

2026

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

2027

"init_gnutls_global failed\n");

2007

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

2028

2008

exitcode = EX_UNAVAILABLE;

2029

2009

goto end;

2030

2010

} else {

2046

2026

}

2047

2027

2048

2028

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

2049

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

2050

"init_gpgme failed\n");

2029

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

2051

2030

exitcode = EX_UNAVAILABLE;

2052

2031

goto end;

2053

2032

} else {

2063

2042

/* (Mainly meant for debugging) */

2064

2043

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

2065

2044

if(address == NULL){

2066

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

2067

"No colon in address\n");

2045

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

2068

2046

exitcode = EX_USAGE;

2069

2047

goto end;

2070

2048

}

2078

2056

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

2079

2057

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

2080

2058

or tmpmax != (uint16_t)tmpmax){

2081

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

2082

"Bad port number\n");

2059

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

2083

2060

exitcode = EX_USAGE;

2084

2061

goto end;

2085

2062

}

2115

2092

break;

2116

2093

}

2117

2094

if(debug){

2118

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

2119

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

2095

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

2096

(int)retry_interval);

2120

2097

}

2121

2098

sleep((int)retry_interval);

2122

2099

}

2152

2129

2153

2130

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

2154

2131

if(mc.server == NULL){

2155

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

2156

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

2157

avahi_strerror(error));

2132

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

2133

avahi_strerror(error));

2158

2134

exitcode = EX_UNAVAILABLE;

2159

2135

goto end;

2160

2136

}

2168

2144

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2169

2145

NULL, 0, browse_callback, NULL);

2170

2146

if(sb == NULL){

2171

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

2172

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

2173

avahi_strerror(avahi_server_errno(mc.server)));

2147

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

2148

avahi_strerror(avahi_server_errno(mc.server)));

2174

2149

exitcode = EX_UNAVAILABLE;

2175

2150

goto end;

2176

2151

}

2182

2157

/* Run the main loop */

2183

2158

2184

2159

if(debug){

2185

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

2186

"Starting Avahi loop search\n");

2160

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

2187

2161

}

2188

2162

2189

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2190

2164

(int)(retry_interval * 1000));

2191

2165

if(debug){

2192

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

2193

"avahi_loop_with_timeout exited %s\n",

2194

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

2166

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

2167

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

2195

2168

}

2196

2169

2197

2170

end:

2198

2171

2199

2172

if(debug){

2200

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

2201

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

2173

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

2202

2174

}

2203

2175

2204

2176

/* Cleanup things */

2232

2204

}

2233

2205

}

2234

2206

2235

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

2236

2237

/* Take down the network interface */

2238

if(take_down_interface){

2239

/* Re-raise priviliges */

2207

/* Re-raise priviliges */

2208

{

2240

2209

errno = 0;

2241

2210

ret = seteuid(0);

2242

2211

if(ret == -1){

2243

2212

perror_plus("seteuid");

2244

2213

}

2245

if(geteuid() == 0){

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){

2246

2221

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

2247

2222

if(ret == -1){

2248

2223

perror_plus("ioctl SIOCGIFFLAGS");

2257

2232

if(ret == -1){

2258

2233

perror_plus("close");

2259

2234

}

2260

/* Lower privileges permanently */

2261

errno = 0;

2262

ret = setuid(uid);

2263

if(ret == -1){

2264

perror_plus("setuid");

2265

}

2266

2235

}

2267

2236

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2268

2243

2269

2244

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

2270

2245

if(tempdir_created){

2284

2259

}

2285

2260

ret = remove(fullname);

2286

2261

if(ret == -1){

2287

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

2288

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

2262

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

2263

strerror(errno));

2289

2264

}

2290

2265

free(fullname);

2291

2266

}