/mandos/release : revision 237.15.6

110

init_gnutls_session(),

111

GNUTLS_* */

112

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

115

116

/* GPGME */

117

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

133

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

134

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

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

136

137

138

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

138

139

typedef struct server{

173

174

perror(print_text);

174

175

}

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: ", program_invocation_short_name));

182

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

183

}

184

176

185

/*

177

186

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

178

187

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

179

188

* "buffer_length" is how much is already used.

180

189

*/

181

190

size_t incbuffer(char **buffer, size_t buffer_length,

182

size_t buffer_capacity){

191

size_t buffer_capacity){

183

192

if(buffer_length + BUFFER_SIZE > buffer_capacity){

184

193

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

185

194

if(buffer == NULL){

191

200

}

192

201

193

202

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

194

int add_server(const char *ip, uint16_t port,

195

AvahiIfIndex if_index,

196

int af){

203

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

204

int af){

197

205

int ret;

198

206

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

199

207

if(new_server == NULL){

201

209

return -1;

202

210

}

203

211

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

204

.port = port,

205

.if_index = if_index,

206

.af = af };

212

.port = port,

213

.if_index = if_index,

214

.af = af };

207

215

if(new_server->ip == NULL){

208

216

perror_plus("strdup");

209

217

return -1;

231

239

/*

232

240

* Initialize GPGME.

233

241

*/

234

static bool init_gpgme(const char *seckey,

235

const char *pubkey, const char *tempdir){

242

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

243

const char *tempdir){

236

244

gpgme_error_t rc;

237

245

gpgme_engine_info_t engine_info;

238

246

253

261

254

262

rc = gpgme_data_new_from_fd(&pgp_data, fd);

255

263

if(rc != GPG_ERR_NO_ERROR){

256

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

257

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

264

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

258

265

gpgme_strsource(rc), gpgme_strerror(rc));

259

266

return false;

260

267

}

261

268

262

269

rc = gpgme_op_import(mc.ctx, pgp_data);

263

270

if(rc != GPG_ERR_NO_ERROR){

264

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

265

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

271

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

266

272

gpgme_strsource(rc), gpgme_strerror(rc));

267

273

return false;

268

274

}

276

282

}

277

283

278

284

if(debug){

279

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

280

"Initializing GPGME\n");

285

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

281

286

}

282

287

283

288

/* Init GPGME */

284

289

gpgme_check_version(NULL);

285

290

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

286

291

if(rc != GPG_ERR_NO_ERROR){

287

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

288

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

292

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

289

293

gpgme_strsource(rc), gpgme_strerror(rc));

290

294

return false;

291

295

}

293

297

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

294

298

rc = gpgme_get_engine_info(&engine_info);

295

299

if(rc != GPG_ERR_NO_ERROR){

296

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

297

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

300

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

298

301

gpgme_strsource(rc), gpgme_strerror(rc));

299

302

return false;

300

303

}

307

310

engine_info = engine_info->next;

308

311

}

309

312

if(engine_info == NULL){

310

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

311

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

313

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

312

314

return false;

313

315

}

314

316

315

317

/* Create new GPGME "context" */

316

318

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

317

319

if(rc != GPG_ERR_NO_ERROR){

318

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

320

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

319

321

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

320

322

gpgme_strerror(rc));

321

323

return false;

342

344

ssize_t plaintext_length = 0;

343

345

344

346

if(debug){

345

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

346

"Trying to decrypt OpenPGP data\n");

347

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

347

348

}

348

349

350

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

350

351

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

351

352

0);

352

353

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

354

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

355

gpgme_strsource(rc), gpgme_strerror(rc));

356

return -1;

357

}

359

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

360

rc = gpgme_data_new(&dh_plain);

361

if(rc != GPG_ERR_NO_ERROR){

362

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

362

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

363

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

364

gpgme_strsource(rc), gpgme_strerror(rc));

365

gpgme_data_release(dh_crypto);

370

data buffer */

371

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

372

if(rc != GPG_ERR_NO_ERROR){

373

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

374

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

373

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

375

374

gpgme_strsource(rc), gpgme_strerror(rc));

376

375

plaintext_length = -1;

377

376

if(debug){

378

377

gpgme_decrypt_result_t result;

379

378

result = gpgme_op_decrypt_result(mc.ctx);

380

379

if(result == NULL){

381

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

382

"gpgme_op_decrypt_result failed\n");

380

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

383

381

} else {

384

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

385

"Unsupported algorithm: %s\n",

382

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

386

383

result->unsupported_algorithm);

387

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

388

"Wrong key usage: %u\n",

384

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

389

385

result->wrong_key_usage);

390

386

if(result->file_name != NULL){

391

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

392

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

387

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

393

388

}

394

389

gpgme_recipient_t recipient;

395

390

recipient = result->recipients;

396

391

while(recipient != NULL){

397

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

398

"Public key algorithm: %s\n",

392

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

399

393

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",

394

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

395

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

404

396

recipient->status == GPG_ERR_NO_SECKEY

405

397

? "No" : "Yes");

406

398

recipient = recipient->next;

411

403

}

412

404

413

405

if(debug){

414

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

415

"Decryption of OpenPGP data succeeded\n");

406

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

416

407

}

417

408

418

409

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

425

416

*plaintext = NULL;

426

417

while(true){

427

418

plaintext_capacity = incbuffer(plaintext,

428

(size_t)plaintext_length,

429

plaintext_capacity);

419

(size_t)plaintext_length,

420

plaintext_capacity);

430

421

if(plaintext_capacity == 0){

431

perror_plus("incbuffer");

432

plaintext_length = -1;

433

goto decrypt_end;

422

perror_plus("incbuffer");

423

plaintext_length = -1;

424

goto decrypt_end;

434

425

}

435

426

436

427

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

449

440

}

450

441

451

442

if(debug){

452

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

453

"Decrypted password is: ");

443

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

454

444

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

455

445

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

456

446

}

478

468

/* GnuTLS log function callback */

479

469

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

480

470

const char* string){

481

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

471

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

482

472

}

483

473

484

474

static int init_gnutls_global(const char *pubkeyfilename,

486

476

int ret;

487

477

488

478

if(debug){

489

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

490

"Initializing GnuTLS\n");

479

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

491

480

}

492

481

493

482

ret = gnutls_global_init();

494

483

if(ret != GNUTLS_E_SUCCESS){

495

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

496

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

484

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

497

485

return -1;

498

486

}

499

487

508

496

/* OpenPGP credentials */

509

497

ret = gnutls_certificate_allocate_credentials(&mc.cred);

510

498

if(ret != GNUTLS_E_SUCCESS){

511

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

512

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

499

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

513

500

gnutls_global_deinit();

514

501

return -1;

515

502

}

516

503

517

504

if(debug){

518

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

519

"Attempting to use OpenPGP public key %s and"

505

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

520

506

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

521

507

seckeyfilename);

522

508

}

525

511

(mc.cred, pubkeyfilename, seckeyfilename,

526

512

GNUTLS_OPENPGP_FMT_BASE64);

527

513

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));

514

fprintf_plus(stderr,

515

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

516

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

517

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

534

518

goto globalfail;

535

519

}

536

520

537

521

/* GnuTLS server initialization */

538

522

ret = gnutls_dh_params_init(&mc.dh_params);

539

523

if(ret != GNUTLS_E_SUCCESS){

540

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

541

"Error in GnuTLS DH parameter initialization:"

524

fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"

542

525

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

543

526

goto globalfail;

544

527

}

545

528

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

546

529

if(ret != GNUTLS_E_SUCCESS){

547

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

548

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

530

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

549

531

safer_gnutls_strerror(ret));

550

532

goto globalfail;

551

533

}

572

554

}

573

555

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

574

556

if(ret != GNUTLS_E_SUCCESS){

575

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

576

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

557

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

577

558

safer_gnutls_strerror(ret));

578

559

}

579

560

587

568

}

588

569

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

589

570

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));

571

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

572

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

594

573

gnutls_deinit(*session);

595

574

return -1;

596

575

}

605

584

}

606

585

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

607

586

if(ret != GNUTLS_E_SUCCESS){

608

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

609

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

587

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

610

588

safer_gnutls_strerror(ret));

611

589

gnutls_deinit(*session);

612

590

return -1;

658

636

pf = PF_INET;

659

637

break;

660

638

default:

661

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

662

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

639

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

663

640

errno = EINVAL;

664

641

return -1;

665

642

}

670

647

}

671

648

672

649

if(debug){

673

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

674

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

650

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

675

651

"\n", ip, port);

676

652

}

677

653

704

680

}

705

681

if(ret == 0){

706

682

int e = errno;

707

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

708

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

683

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

709

684

errno = e;

710

685

goto mandos_end;

711

686

}

716

691

717

692

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

718

693

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

719

-Wunreachable-code*/

694

-Wunreachable-code*/

720

695

if(if_index == AVAHI_IF_UNSPEC){

721

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

722

"An IPv6 link-local address is incomplete"

696

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

723

697

" without a network interface\n");

724

698

errno = EINVAL;

725

699

goto mandos_end;

744

718

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

745

719

perror_plus("if_indextoname");

746

720

} else {

747

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

748

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

721

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

749

722

ip, interface, port);

750

723

}

751

724

} else {

752

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

753

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

725

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

754

726

}

755

727

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

756

728

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

766

738

perror_plus("inet_ntop");

767

739

} else {

768

740

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

769

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

770

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

741

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

771

742

}

772

743

}

773

744

}

801

772

while(true){

802

773

size_t out_size = strlen(out);

803

774

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

804

out_size - written));

775

out_size - written));

805

776

if(ret == -1){

806

777

int e = errno;

807

778

perror_plus("write");

827

798

}

828

799

829

800

if(debug){

830

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

831

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

801

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

832

802

}

833

803

834

804

if(quit_now){

854

824

855

825

if(ret != GNUTLS_E_SUCCESS){

856

826

if(debug){

857

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

858

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

827

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

859

828

gnutls_perror(ret);

860

829

}

861

830

errno = EPROTO;

865

834

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

866

835

867

836

if(debug){

868

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

869

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

837

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

870

838

}

871

839

872

840

while(true){

877

845

}

878

846

879

847

buffer_capacity = incbuffer(&buffer, buffer_length,

880

buffer_capacity);

848

buffer_capacity);

881

849

if(buffer_capacity == 0){

882

850

int e = errno;

883

851

perror_plus("incbuffer");

910

878

}

911

879

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

912

880

if(ret < 0){

913

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

914

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

881

fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");

915

882

gnutls_perror(ret);

916

883

errno = EPROTO;

917

884

goto mandos_end;

918

885

}

919

886

break;

920

887

default:

921

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

922

"Unknown error while reading data from"

888

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

923

889

" encrypted session with Mandos server\n");

924

890

gnutls_bye(session, GNUTLS_SHUT_RDWR);

925

891

errno = EIO;

931

897

}

932

898

933

899

if(debug){

934

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

935

"Closing TLS session\n");

900

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

936

901

}

937

902

938

903

if(quit_now){

950

915

951

916

if(buffer_length > 0){

952

917

ssize_t decrypted_buffer_size;

953

decrypted_buffer_size = pgp_packet_decrypt(buffer,

954

buffer_length,

918

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

955

919

&decrypted_buffer);

956

920

if(decrypted_buffer_size >= 0){

957

921

968

932

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

969

933

int e = errno;

970

934

if(debug){

971

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

972

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

935

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

973

936

strerror(errno));

974

937

}

975

938

errno = e;

1033

996

switch(event){

1034

997

default:

1035

998

case AVAHI_RESOLVER_FAILURE:

1036

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

1037

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

999

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

1038

1000

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

1039

1001

avahi_strerror(avahi_server_errno(mc.server)));

1040

1002

break;

1044

1006

char ip[AVAHI_ADDRESS_STR_MAX];

1045

1007

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

1046

1008

if(debug){

1047

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

1048

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

1009

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

1049

1010

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

1050

1011

ip, (intmax_t)interface, port);

1051

1012

}

1085

1046

default:

1086

1047

case AVAHI_BROWSER_FAILURE:

1087

1048

1088

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

1089

"(Avahi browser) %s\n",

1049

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

1090

1050

avahi_strerror(avahi_server_errno(mc.server)));

1091

1051

avahi_simple_poll_quit(mc.simple_poll);

1092

1052

return;

1100

1060

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

1101

1061

name, type, domain, protocol, 0,

1102

1062

resolve_callback, NULL) == NULL)

1103

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

1104

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

1063

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

1105

1064

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

1106

1065

break;

1107

1066

1111

1070

case AVAHI_BROWSER_ALL_FOR_NOW:

1112

1071

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1113

1072

if(debug){

1114

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

1115

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

1073

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

1116

1074

}

1117

1075

break;

1118

1076

}

1157

1115

/* Reject the loopback device */

1158

1116

if(ifr->ifr_flags & IFF_LOOPBACK){

1159

1117

if(debug){

1160

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

1161

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

1118

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

1162

1119

}

1163

1120

return false;

1164

1121

}

1165

1122

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

1166

1123

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

1167

1124

if(debug){

1168

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

1169

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

1125

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

1170

1126

}

1171

1127

return true;

1172

1128

}

1173

1129

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

1174

1130

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

1175

1131

if(debug){

1176

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

1177

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

1132

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

1178

1133

}

1179

1134

return false;

1180

1135

}

1181

1136

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

1182

1137

if(ifr->ifr_flags & IFF_NOARP){

1183

1138

if(debug){

1184

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

1185

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

1139

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

1186

1140

}

1187

1141

return false;

1188

1142

}

1189

1143

1190

1144

/* Accept this device */

1191

1145

if(debug){

1192

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

1193

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

1146

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

1194

1147

}

1195

1148

return true;

1196

1149

}

1208

1161

struct ifreq ifr;

1209

1162

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

1210

1163

if(debug){

1211

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

1212

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

1164

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

1213

1165

if_entry->d_name);

1214

1166

}

1215

1167

return 0;

1234

1186

struct ifreq ifr;

1235

1187

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

1236

1188

if(debug){

1237

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

1238

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

1189

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

1239

1190

if_entry->d_name);

1240

1191

}

1241

1192

return 0;

1244

1195

/* Reject down interfaces */

1245

1196

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

1246

1197

if(debug){

1247

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

1248

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

1198

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

1249

1199

if_entry->d_name);

1250

1200

}

1251

1201

return 0;

1254

1204

/* Reject non-running interfaces */

1255

1205

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

1256

1206

if(debug){

1257

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

1258

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

1207

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

1259

1208

if_entry->d_name);

1260

1209

}

1261

1210

return 0;

1281

1230

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

1282

1231

int runnable_hook(const struct dirent *direntry){

1283

1232

int ret;

1233

size_t sret;

1284

1234

struct stat st;

1285

1235

1286

1236

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

1288

1238

return 0;

1289

1239

}

1290

1240

1291

/* Save pointer to last character */

1292

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

1293

1294

if(*end == '~'){

1295

/* Backup name~ */

1296

return 0;

1297

}

1298

1299

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

1300

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

1301

/* Temporary #name# */

1302

return 0;

1303

}

1304

1305

/* XXX more rules here */

1306

1307

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

1241

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

1242

"abcdefghijklmnopqrstuvwxyz"

1243

"0123456789"

1244

"_-");

1245

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

1246

/* Contains non-allowed characters */

1247

if(debug){

1248

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

1249

direntry->d_name);

1250

}

1251

return 0;

1252

}

1253

1254

char *fullname = NULL;

1255

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

1256

if(ret < 0){

1257

perror_plus("asprintf");

1258

return 0;

1259

}

1260

1261

ret = stat(fullname, &st);

1308

1262

if(ret == -1){

1309

1263

if(debug){

1310

perror_plus("Could not stat plugin");

1264

perror_plus("Could not stat hook");

1311

1265

}

1312

1266

return 0;

1313

1267

}

1314

1268

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

1315

1269

/* Not a regular file */

1270

if(debug){

1271

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

1272

direntry->d_name);

1273

}

1316

1274

return 0;

1317

1275

}

1318

1276

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

1319

1277

/* Not executable */

1278

if(debug){

1279

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

1280

direntry->d_name);

1281

}

1320

1282

return 0;

1321

1283

}

1322

1284

return 1;

1331

1293

while(true){

1332

1294

if(mc.current_server == NULL){

1333

1295

if (debug){

1334

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

1335

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

1296

fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");

1336

1297

}

1337

1298

ret = avahi_simple_poll_iterate(s, -1);

1338

1299

} else {

1339

1300

if (debug){

1340

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

1341

"Check current_server if we should run it,"

1301

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

1342

1302

" or wait\n");

1343

1303

}

1344

1304

/* the current time */

1361

1321

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

1362

1322

1363

1323

if (debug){

1364

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

1365

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

1324

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

1366

1325

}

1367

1326

1368

1327

if(block_time <= 0){

1482

1441

.arg = "SECONDS",

1483

1442

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

1484

1443

.group = 2 },

1444

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

1445

.arg = "DIR",

1446

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

1447

.group = 2 },

1485

1448

/*

1486

1449

* These reproduce what we would get without ARGP_NO_HELP

1487

1450

*/

1540

1503

argp_error(state, "Bad retry interval");

1541

1504

}

1542

1505

break;

1506

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

1507

hookdir = arg;

1508

break;

1543

1509

/*

1544

1510

* These reproduce what we would get without ARGP_NO_HELP

1545

1511

*/

1551

1517

argp_state_help(state, state->out_stream,

1552

1518

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1553

1519

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

1554

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

1555

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

1520

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

1521

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

1556

1522

exit(argp_err_exit_status);

1557

1523

break;

1558

1524

default:

1646

1612

{

1647

1613

struct dirent **direntries;

1648

1614

struct dirent *direntry;

1649

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

1615

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

1650

1616

alphasort);

1651

1617

if(numhooks == -1){

1652

1618

perror_plus("scandir");

1655

1621

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

1656

1622

direntry = direntries[0];

1657

1623

char *fullname = NULL;

1658

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

1659

direntry->d_name);

1624

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

1660

1625

if(ret < 0){

1661

1626

perror_plus("asprintf");

1662

1627

continue;

1667

1632

dup2(devnull, STDIN_FILENO);

1668

1633

close(devnull);

1669

1634

dup2(STDERR_FILENO, STDOUT_FILENO);

1635

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

1636

if(ret == -1){

1637

perror_plus("setenv");

1638

exit(1);

1639

}

1670

1640

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

1671

1641

if(ret == -1){

1672

1642

perror_plus("setenv");

1706

1676

}

1707

1677

if(WIFEXITED(status)){

1708

1678

if(WEXITSTATUS(status) != 0){

1709

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

1710

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

1679

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

1711

1680

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

1712

1681

WEXITSTATUS(status));

1713

1682

free(fullname);

1714

1683

continue;

1715

1684

}

1716

1685

} else if(WIFSIGNALED(status)){

1717

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

1718

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

1686

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

1719

1687

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

1720

1688

WTERMSIG(status));

1721

1689

free(fullname);

1722

1690

continue;

1723

1691

} else {

1724

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

1725

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

1692

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

1726

1693

direntry->d_name);

1727

1694

free(fullname);

1728

1695

continue;

1756

1723

/* Pick the first interface returned */

1757

1724

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

1758

1725

if(debug){

1759

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

1760

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

1726

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

1761

1727

}

1762

1728

if(interface == NULL){

1763

1729

perror_plus("malloc");

1768

1734

free(direntries);

1769

1735

} else {

1770

1736

free(direntries);

1771

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

1772

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

1737

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

1773

1738

exitcode = EXIT_FAILURE;

1774

1739

goto end;

1775

1740

}

1781

1746

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

1782

1747

mc.simple_poll = avahi_simple_poll_new();

1783

1748

if(mc.simple_poll == NULL){

1784

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

1785

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

1749

fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");

1786

1750

exitcode = EX_UNAVAILABLE;

1787

1751

goto end;

1788

1752

}

1854

1818

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

1855

1819

if_index = (AvahiIfIndex) if_nametoindex(interface);

1856

1820

if(if_index == 0){

1857

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

1858

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

1821

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

1859

1822

exitcode = EX_UNAVAILABLE;

1860

1823

goto end;

1861

1824

}

2002

1965

2003

1966

ret = init_gnutls_global(pubkey, seckey);

2004

1967

if(ret == -1){

2005

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

2006

"init_gnutls_global failed\n");

1968

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

2007

1969

exitcode = EX_UNAVAILABLE;

2008

1970

goto end;

2009

1971

} else {

2025

1987

}

2026

1988

2027

1989

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

2028

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

2029

"init_gpgme failed\n");

1990

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

2030

1991

exitcode = EX_UNAVAILABLE;

2031

1992

goto end;

2032

1993

} else {

2042

2003

/* (Mainly meant for debugging) */

2043

2004

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

2044

2005

if(address == NULL){

2045

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

2046

"No colon in address\n");

2006

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

2047

2007

exitcode = EX_USAGE;

2048

2008

goto end;

2049

2009

}

2057

2017

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

2058

2018

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

2059

2019

or tmpmax != (uint16_t)tmpmax){

2060

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

2061

"Bad port number\n");

2020

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

2062

2021

exitcode = EX_USAGE;

2063

2022

goto end;

2064

2023

}

2094

2053

break;

2095

2054

}

2096

2055

if(debug){

2097

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

2098

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

2056

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

2099

2057

}

2100

2058

sleep((int)retry_interval);

2101

2059

}

2131

2089

2132

2090

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

2133

2091

if(mc.server == NULL){

2134

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

2135

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

2092

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

2136

2093

avahi_strerror(error));

2137

2094

exitcode = EX_UNAVAILABLE;

2138

2095

goto end;

2147

2104

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2148

2105

NULL, 0, browse_callback, NULL);

2149

2106

if(sb == NULL){

2150

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

2151

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

2107

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

2152

2108

avahi_strerror(avahi_server_errno(mc.server)));

2153

2109

exitcode = EX_UNAVAILABLE;

2154

2110

goto end;

2161

2117

/* Run the main loop */

2162

2118

2163

2119

if(debug){

2164

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

2165

"Starting Avahi loop search\n");

2120

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

2166

2121

}

2167

2122

2168

2123

ret = avahi_loop_with_timeout(mc.simple_poll,

2169

2124

(int)(retry_interval * 1000));

2170

2125

if(debug){

2171

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

2172

"avahi_loop_with_timeout exited %s\n",

2126

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

2173

2127

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

2174

2128

}

2175

2129

2176

2130

end:

2177

2131

2178

2132

if(debug){

2179

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

2180

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

2133

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

2181

2134

}

2182

2135

2183

2136

/* Cleanup things */

2263

2216

}

2264

2217

ret = remove(fullname);

2265

2218

if(ret == -1){

2266

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

2267

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

2219

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

2268

2220

}

2269

2221

free(fullname);

2270

2222

}