/mandos/release : revision 237.16.16

73

*/

74

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

75

getuid(), getgid(), seteuid(),

76

setgid(), pause() */

76

setgid(), pause(), _exit() */

77

#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

78

#include <iso646.h> /* not, or, and */

79

#include <argp.h> /* struct argp_option, error_t, struct

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

89

WEXITSTATUS(), WTERMSIG() */

90

#include <grp.h> /* setgroups() */

90

91

92

#ifdef __linux__

92

93

#include <sys/klog.h> /* klogctl() */

110

111

init_gnutls_session(),

111

112

GNUTLS_* */

112

113

#include <gnutls/openpgp.h>

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

115

116

117

/* GPGME */

117

118

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

174

175

perror(print_text);

175

176

}

176

177

178

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

179

va_list ap;

180

va_start (ap, format);

181

182

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

183

program_invocation_short_name));

184

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

185

}

186

177

187

/*

178

188

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

179

189

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

180

190

* "buffer_length" is how much is already used.

181

191

*/

182

192

size_t incbuffer(char **buffer, size_t buffer_length,

183

size_t buffer_capacity){

193

size_t buffer_capacity){

184

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

185

195

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

186

196

if(buffer == NULL){

192

202

}

193

203

194

204

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

195

int add_server(const char *ip, uint16_t port,

196

AvahiIfIndex if_index,

197

int af){

205

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

206

int af){

198

207

int ret;

199

208

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

200

209

if(new_server == NULL){

202

211

return -1;

203

212

}

204

213

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

205

.port = port,

206

.if_index = if_index,

207

.af = af };

214

.port = port,

215

.if_index = if_index,

216

.af = af };

208

217

if(new_server->ip == NULL){

209

218

perror_plus("strdup");

210

219

return -1;

232

241

/*

233

242

* Initialize GPGME.

234

243

*/

235

static bool init_gpgme(const char *seckey,

236

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

237

246

gpgme_error_t rc;

238

247

gpgme_engine_info_t engine_info;

239

248

254

263

255

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

256

265

if(rc != GPG_ERR_NO_ERROR){

257

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

258

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

259

gpgme_strsource(rc), gpgme_strerror(rc));

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

260

268

return false;

261

269

}

262

270

263

271

rc = gpgme_op_import(mc.ctx, pgp_data);

264

272

if(rc != GPG_ERR_NO_ERROR){

265

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

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

268

275

return false;

269

276

}

270

277

284

}

278

285

279

286

if(debug){

280

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

281

"Initializing GPGME\n");

287

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

282

288

}

283

289

284

290

/* Init GPGME */

285

291

gpgme_check_version(NULL);

286

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

287

293

if(rc != GPG_ERR_NO_ERROR){

288

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

289

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

290

gpgme_strsource(rc), gpgme_strerror(rc));

294

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

295

gpgme_strsource(rc), gpgme_strerror(rc));

291

296

return false;

292

297

}

293

298

294

299

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

295

300

rc = gpgme_get_engine_info(&engine_info);

296

301

if(rc != GPG_ERR_NO_ERROR){

297

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

298

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

299

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

300

304

return false;

301

305

}

302

306

while(engine_info != NULL){

308

312

engine_info = engine_info->next;

309

313

}

310

314

if(engine_info == NULL){

311

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

312

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

315

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

316

tempdir);

313

317

return false;

314

318

}

315

319

316

320

/* Create new GPGME "context" */

317

321

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

318

322

if(rc != GPG_ERR_NO_ERROR){

319

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

320

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

321

gpgme_strerror(rc));

323

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

324

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

325

gpgme_strerror(rc));

322

326

return false;

323

327

}

324

328

343

347

ssize_t plaintext_length = 0;

344

348

345

349

if(debug){

346

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

347

"Trying to decrypt OpenPGP data\n");

350

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

348

351

}

349

352

350

353

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

351

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

352

355

0);

353

356

if(rc != GPG_ERR_NO_ERROR){

354

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

355

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

356

gpgme_strsource(rc), gpgme_strerror(rc));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

357

359

return -1;

358

360

}

359

361

360

362

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

361

363

rc = gpgme_data_new(&dh_plain);

362

364

if(rc != GPG_ERR_NO_ERROR){

363

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

364

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

365

gpgme_strsource(rc), gpgme_strerror(rc));

365

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

366

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

367

gpgme_strsource(rc), gpgme_strerror(rc));

366

368

gpgme_data_release(dh_crypto);

367

369

return -1;

368

370

}

371

373

data buffer */

372

374

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

373

375

if(rc != GPG_ERR_NO_ERROR){

374

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

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

377

378

plaintext_length = -1;

378

379

if(debug){

379

380

gpgme_decrypt_result_t result;

380

381

result = gpgme_op_decrypt_result(mc.ctx);

381

382

if(result == NULL){

382

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

383

"gpgme_op_decrypt_result failed\n");

383

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

384

} else {

385

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

386

"Unsupported algorithm: %s\n",

387

result->unsupported_algorithm);

388

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

389

"Wrong key usage: %u\n",

390

result->wrong_key_usage);

385

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

386

result->unsupported_algorithm);

387

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

388

result->wrong_key_usage);

391

389

if(result->file_name != NULL){

392

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

393

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

390

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

394

391

}

395

392

gpgme_recipient_t recipient;

396

393

recipient = result->recipients;

397

394

while(recipient != NULL){

398

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

399

"Public key algorithm: %s\n",

400

gpgme_pubkey_algo_name(recipient->pubkey_algo));

401

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

402

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

403

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

404

"Secret key available: %s\n",

405

recipient->status == GPG_ERR_NO_SECKEY

406

? "No" : "Yes");

395

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

396

gpgme_pubkey_algo_name

397

(recipient->pubkey_algo));

398

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

399

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

400

recipient->status == GPG_ERR_NO_SECKEY

401

? "No" : "Yes");

407

402

recipient = recipient->next;

408

403

}

409

404

}

412

407

}

413

408

414

409

if(debug){

415

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

416

"Decryption of OpenPGP data succeeded\n");

410

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

417

411

}

418

412

419

413

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

426

420

*plaintext = NULL;

427

421

while(true){

428

422

plaintext_capacity = incbuffer(plaintext,

429

(size_t)plaintext_length,

430

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

431

425

if(plaintext_capacity == 0){

432

perror_plus("incbuffer");

433

plaintext_length = -1;

434

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

435

429

}

436

430

437

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

450

444

}

451

445

452

446

if(debug){

453

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

454

"Decrypted password is: ");

447

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

455

448

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

456

449

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

457

450

}

479

472

/* GnuTLS log function callback */

480

473

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

481

474

const char* string){

482

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

475

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

483

476

}

484

477

485

478

static int init_gnutls_global(const char *pubkeyfilename,

487

480

int ret;

488

481

489

482

if(debug){

490

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

491

"Initializing GnuTLS\n");

483

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

492

484

}

493

485

494

486

ret = gnutls_global_init();

495

487

if(ret != GNUTLS_E_SUCCESS){

496

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

497

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

488

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

489

safer_gnutls_strerror(ret));

498

490

return -1;

499

491

}

500

492

509

501

/* OpenPGP credentials */

510

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

511

503

if(ret != GNUTLS_E_SUCCESS){

512

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

513

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

504

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

505

safer_gnutls_strerror(ret));

514

506

gnutls_global_deinit();

515

507

return -1;

516

508

}

517

509

518

510

if(debug){

519

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

520

"Attempting to use OpenPGP public key %s and"

521

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

522

seckeyfilename);

511

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

512

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

513

pubkeyfilename,

514

seckeyfilename);

523

515

}

524

516

525

517

ret = gnutls_certificate_set_openpgp_key_file

526

518

(mc.cred, pubkeyfilename, seckeyfilename,

527

519

GNUTLS_OPENPGP_FMT_BASE64);

528

520

if(ret != GNUTLS_E_SUCCESS){

529

fprintf(stderr,

530

"Mandos plugin mandos-client: "

531

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

532

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

533

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

534

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

521

fprintf_plus(stderr,

522

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

523

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

524

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

525

safer_gnutls_strerror(ret));

535

526

goto globalfail;

536

527

}

537

528

538

529

/* GnuTLS server initialization */

539

530

ret = gnutls_dh_params_init(&mc.dh_params);

540

531

if(ret != GNUTLS_E_SUCCESS){

541

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

542

"Error in GnuTLS DH parameter initialization:"

543

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

544

535

goto globalfail;

545

536

}

546

537

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

547

538

if(ret != GNUTLS_E_SUCCESS){

548

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

549

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

550

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

551

541

goto globalfail;

552

542

}

553

543

573

563

}

574

564

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

575

565

if(ret != GNUTLS_E_SUCCESS){

576

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

577

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

578

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

579

569

}

580

570

581

571

{

588

578

}

589

579

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

590

580

if(ret != GNUTLS_E_SUCCESS){

591

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

592

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

593

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

594

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

581

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

582

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

583

safer_gnutls_strerror(ret));

595

584

gnutls_deinit(*session);

596

585

return -1;

597

586

}

606

595

}

607

596

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

608

597

if(ret != GNUTLS_E_SUCCESS){

609

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

610

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

611

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

612

600

gnutls_deinit(*session);

613

601

return -1;

614

602

}

659

647

pf = PF_INET;

660

648

break;

661

649

default:

662

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

663

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

650

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

664

651

errno = EINVAL;

665

652

return -1;

666

653

}

671

658

}

672

659

673

660

if(debug){

674

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

675

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

676

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

677

663

}

678

664

679

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

705

691

}

706

692

if(ret == 0){

707

693

int e = errno;

708

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

709

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

694

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

710

695

errno = e;

711

696

goto mandos_end;

712

697

}

717

702

718

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

719

704

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

720

-Wunreachable-code*/

705

-Wunreachable-code*/

721

706

if(if_index == AVAHI_IF_UNSPEC){

722

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

723

"An IPv6 link-local address is incomplete"

724

" without a network interface\n");

707

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

708

" incomplete without a network interface\n");

725

709

errno = EINVAL;

726

710

goto mandos_end;

727

711

}

745

729

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

746

730

perror_plus("if_indextoname");

747

731

} else {

748

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

749

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

750

ip, interface, port);

732

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

733

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

751

734

}

752

735

} else {

753

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

754

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

736

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

737

ip, port);

755

738

}

756

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

757

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

767

750

perror_plus("inet_ntop");

768

751

} else {

769

752

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

770

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

771

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

753

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

772

754

}

773

755

}

774

756

}

802

784

while(true){

803

785

size_t out_size = strlen(out);

804

786

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

805

out_size - written));

787

out_size - written));

806

788

if(ret == -1){

807

789

int e = errno;

808

790

perror_plus("write");

828

810

}

829

811

830

812

if(debug){

831

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

832

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

813

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

833

814

}

834

815

835

816

if(quit_now){

855

836

856

837

if(ret != GNUTLS_E_SUCCESS){

857

838

if(debug){

858

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

859

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

839

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

860

840

gnutls_perror(ret);

861

841

}

862

842

errno = EPROTO;

866

846

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

867

847

868

848

if(debug){

869

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

870

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

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

871

851

}

872

852

873

853

while(true){

878

858

}

879

859

880

860

buffer_capacity = incbuffer(&buffer, buffer_length,

881

buffer_capacity);

861

buffer_capacity);

882

862

if(buffer_capacity == 0){

883

863

int e = errno;

884

864

perror_plus("incbuffer");

911

891

}

912

892

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

913

893

if(ret < 0){

914

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

915

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

894

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

895

"***\n");

916

896

gnutls_perror(ret);

917

897

errno = EPROTO;

918

898

goto mandos_end;

919

899

}

920

900

break;

921

901

default:

922

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

923

"Unknown error while reading data from"

924

" encrypted session with Mandos server\n");

902

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

903

" encrypted session with Mandos server\n");

925

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

926

905

errno = EIO;

927

906

goto mandos_end;

932

911

}

933

912

934

913

if(debug){

935

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

936

"Closing TLS session\n");

914

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

937

915

}

938

916

939

917

if(quit_now){

951

929

952

930

if(buffer_length > 0){

953

931

ssize_t decrypted_buffer_size;

954

decrypted_buffer_size = pgp_packet_decrypt(buffer,

955

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

956

933

&decrypted_buffer);

957

934

if(decrypted_buffer_size >= 0){

958

935

969

946

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

970

947

int e = errno;

971

948

if(debug){

972

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

973

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

974

strerror(errno));

949

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

950

strerror(errno));

975

951

}

976

952

errno = e;

977

953

goto mandos_end;

1034

1010

switch(event){

1035

1011

default:

1036

1012

case AVAHI_RESOLVER_FAILURE:

1037

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

1038

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

1039

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

1040

avahi_strerror(avahi_server_errno(mc.server)));

1013

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

1014

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

1015

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

1041

1017

break;

1042

1018

1043

1019

case AVAHI_RESOLVER_FOUND:

1045

1021

char ip[AVAHI_ADDRESS_STR_MAX];

1046

1022

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

1047

1023

if(debug){

1048

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

1049

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

1050

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

1051

ip, (intmax_t)interface, port);

1024

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

1025

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

1026

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

1052

1027

}

1053

1028

int ret = start_mandos_communication(ip, port, interface,

1054

1029

avahi_proto_to_af(proto));

1086

1061

default:

1087

1062

case AVAHI_BROWSER_FAILURE:

1088

1063

1089

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

1090

"(Avahi browser) %s\n",

1091

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1092

1066

avahi_simple_poll_quit(mc.simple_poll);

1093

1067

return;

1094

1068

1101

1075

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

1102

1076

name, type, domain, protocol, 0,

1103

1077

resolve_callback, NULL) == NULL)

1104

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

1105

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

1106

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

1078

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

1079

" %s\n", name,

1080

avahi_strerror(avahi_server_errno(mc.server)));

1107

1081

break;

1108

1082

1109

1083

case AVAHI_BROWSER_REMOVE:

1112

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

1113

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1114

1088

if(debug){

1115

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

1116

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

1089

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

1090

" searching...\n");

1117

1091

}

1118

1092

break;

1119

1093

}

1158

1132

/* Reject the loopback device */

1159

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1160

1134

if(debug){

1161

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

1162

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

1135

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

1136

ifname);

1163

1137

}

1164

1138

return false;

1165

1139

}

1166

1140

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

1167

1141

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

1168

1142

if(debug){

1169

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

1170

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

1143

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

1144

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

1171

1145

}

1172

1146

return true;

1173

1147

}

1174

1148

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

1175

1149

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

1176

1150

if(debug){

1177

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

1178

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

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1179

1153

}

1180

1154

return false;

1181

1155

}

1182

1156

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

1183

1157

if(ifr->ifr_flags & IFF_NOARP){

1184

1158

if(debug){

1185

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

1186

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

1159

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

1160

ifname);

1187

1161

}

1188

1162

return false;

1189

1163

}

1190

1164

1191

1165

/* Accept this device */

1192

1166

if(debug){

1193

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

1194

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

1167

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

1195

1168

}

1196

1169

return true;

1197

1170

}

1209

1182

struct ifreq ifr;

1210

1183

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

1211

1184

if(debug){

1212

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

1213

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

1214

if_entry->d_name);

1185

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

1186

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

1215

1187

}

1216

1188

return 0;

1217

1189

}

1235

1207

struct ifreq ifr;

1236

1208

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

1237

1209

if(debug){

1238

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

1239

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

1240

if_entry->d_name);

1210

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

1211

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

1241

1212

}

1242

1213

return 0;

1243

1214

}

1245

1216

/* Reject down interfaces */

1246

1217

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

1247

1218

if(debug){

1248

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

1249

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

1250

if_entry->d_name);

1219

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

1220

if_entry->d_name);

1251

1221

}

1252

1222

return 0;

1253

1223

}

1255

1225

/* Reject non-running interfaces */

1256

1226

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

1257

1227

if(debug){

1258

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

1259

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

1260

if_entry->d_name);

1228

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

1229

if_entry->d_name);

1261

1230

}

1262

1231

return 0;

1263

1232

}

1282

1251

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

1283

1252

int runnable_hook(const struct dirent *direntry){

1284

1253

int ret;

1254

size_t sret;

1285

1255

struct stat st;

1286

1256

1287

1257

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

1289

1259

return 0;

1290

1260

}

1291

1261

1292

/* Save pointer to last character */

1293

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

1294

1295

if(*end == '~'){

1296

/* Backup name~ */

1297

return 0;

1298

}

1299

1300

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

1301

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

1302

/* Temporary #name# */

1303

return 0;

1304

}

1305

1306

/* XXX more rules here */

1262

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

1263

"abcdefghijklmnopqrstuvwxyz"

1264

"0123456789"

1265

"_-");

1266

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

1267

/* Contains non-allowed characters */

1268

if(debug){

1269

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

1270

direntry->d_name);

1271

}

1272

return 0;

1273

}

1307

1274

1308

1275

char *fullname = NULL;

1309

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

1310

direntry->d_name);

1276

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

1311

1277

if(ret < 0){

1312

1278

perror_plus("asprintf");

1313

1279

return 0;

1316

1282

ret = stat(fullname, &st);

1317

1283

if(ret == -1){

1318

1284

if(debug){

1319

perror_plus("Could not stat plugin");

1285

perror_plus("Could not stat hook");

1320

1286

}

1321

1287

return 0;

1322

1288

}

1323

1289

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

1324

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1325

1295

return 0;

1326

1296

}

1327

1297

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

1328

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1329

1303

return 0;

1330

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1331

1309

return 1;

1332

1310

}

1333

1311

1340

1318

while(true){

1341

1319

if(mc.current_server == NULL){

1342

1320

if (debug){

1343

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

1344

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

1321

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

1322

" No timeout!\n");

1345

1323

}

1346

1324

ret = avahi_simple_poll_iterate(s, -1);

1347

1325

} else {

1348

1326

if (debug){

1349

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

1350

"Check current_server if we should run it,"

1351

" or wait\n");

1327

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

1328

" it, or wait\n");

1352

1329

}

1353

1330

/* the current time */

1354

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1370

1347

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

1371

1348

1372

1349

if (debug){

1373

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

1374

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

1350

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

1351

block_time);

1375

1352

}

1376

1353

1377

1354

if(block_time <= 0){

1404

1381

}

1405

1382

}

1406

1383

1384

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

1385

const float delay){

1386

struct dirent **direntries;

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1391

if(numhooks == -1){

1392

perror_plus("scandir");

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

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

1399

if(ret < 0){

1400

perror_plus("asprintf");

1401

continue;

1402

}

1403

if(debug){

1404

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

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());

1435

fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());

1436

dup2(devnull, STDIN_FILENO);

1437

close(devnull);

1438

dup2(STDERR_FILENO, STDOUT_FILENO);

1439

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

1440

if(ret == -1){

1441

perror_plus("setenv");

1442

_exit(EX_OSERR);

1443

}

1444

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

1445

if(ret == -1){

1446

perror_plus("setenv");

1447

_exit(EX_OSERR);

1448

}

1449

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

1450

if(ret == -1){

1451

perror_plus("setenv");

1452

_exit(EX_OSERR);

1453

}

1454

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

1455

if(ret == -1){

1456

perror_plus("setenv");

1457

_exit(EX_OSERR);

1458

}

1459

char *delaystring;

1460

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

1461

if(ret == -1){

1462

perror_plus("asprintf");

1463

_exit(EX_OSERR);

1464

}

1465

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

1466

if(ret == -1){

1467

free(delaystring);

1468

perror_plus("setenv");

1469

_exit(EX_OSERR);

1470

}

1471

free(delaystring);

1472

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

1473

perror_plus("execl");

1474

} else {

1475

int status;

1476

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

1477

perror_plus("waitpid");

1478

free(fullname);

1479

continue;

1480

}

1481

if(WIFEXITED(status)){

1482

if(WEXITSTATUS(status) != 0){

1483

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

1484

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

1485

WEXITSTATUS(status));

1486

free(fullname);

1487

continue;

1488

}

1489

} else if(WIFSIGNALED(status)){

1490

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

1491

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

1492

WTERMSIG(status));

1493

free(fullname);

1494

continue;

1495

} else {

1496

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

1497

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

1498

free(fullname);

1499

continue;

1500

}

1501

}

1502

free(fullname);

1503

if(debug){

1504

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

1505

direntry->d_name);

1506

}

1507

}

1508

close(devnull);

1509

}

1510

return true;

1511

}

1512

1407

1513

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

1408

1514

AvahiSServiceBrowser *sb = NULL;

1409

1515

int error;

1567

1673

argp_state_help(state, state->out_stream,

1568

1674

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1569

1675

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

1570

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

1571

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

1676

fprintf_plus(state->out_stream,

1677

"Mandos plugin mandos-client: ");

1678

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

1572

1679

exit(argp_err_exit_status);

1573

1680

break;

1574

1681

default:

1601

1708

{

1602

1709

/* Work around Debian bug #633582:

1603

1710

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

1604

struct stat st;

1605

1711

1606

1712

/* Re-raise priviliges */

1607

1713

errno = 0;

1608

1714

ret = seteuid(0);

1609

1715

if(ret == -1){

1610

1716

perror_plus("seteuid");

1611

}

1612

1613

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

1614

int seckey_fd = open(seckey, O_RDONLY);

1615

if(seckey_fd == -1){

1616

perror_plus("open");

1617

} else {

1618

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

1619

if(ret == -1){

1620

perror_plus("fstat");

1621

} else {

1622

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

1623

ret = fchown(seckey_fd, uid, gid);

1624

if(ret == -1){

1625

perror_plus("fchown");

1626

}

1627

}

1628

}

1629

TEMP_FAILURE_RETRY(close(seckey_fd));

1630

}

1631

}

1632

1633

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

1634

int pubkey_fd = open(pubkey, O_RDONLY);

1635

if(pubkey_fd == -1){

1636

perror_plus("open");

1637

} else {

1638

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

1639

if(ret == -1){

1640

perror_plus("fstat");

1641

} else {

1642

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

1643

ret = fchown(pubkey_fd, uid, gid);

1644

if(ret == -1){

1645

perror_plus("fchown");

1646

}

1647

}

1648

}

1649

TEMP_FAILURE_RETRY(close(pubkey_fd));

1650

}

1651

}

1652

1653

/* Lower privileges */

1654

errno = 0;

1655

ret = seteuid(uid);

1656

if(ret == -1){

1657

perror_plus("seteuid");

1658

}

1659

}

1660

1661

/* Find network hooks and run them */

1662

{

1663

struct dirent **direntries;

1664

struct dirent *direntry;

1665

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

1666

alphasort);

1667

if(numhooks == -1){

1668

perror_plus("scandir");

1669

1717

} else {

1670

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

1671

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

1672

direntry = direntries[0];

1673

char *fullname = NULL;

1674

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

1675

if(ret < 0){

1676

perror_plus("asprintf");

1677

continue;

1678

}

1679

pid_t hook_pid = fork();

1680

if(hook_pid == 0){

1681

/* Child */

1682

dup2(devnull, STDIN_FILENO);

1683

close(devnull);

1684

dup2(STDERR_FILENO, STDOUT_FILENO);

1685

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

1686

if(ret == -1){

1687

perror_plus("setenv");

1688

exit(1);

1689

}

1690

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

1691

if(ret == -1){

1692

perror_plus("setenv");

1693

exit(1);

1694

}

1695

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

1696

if(ret == -1){

1697

perror_plus("setenv");

1698

exit(1);

1699

}

1700

char *delaystring;

1701

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

1702

if(ret == -1){

1703

perror_plus("asprintf");

1704

exit(1);

1705

}

1706

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

1707

if(ret == -1){

1708

free(delaystring);

1709

perror_plus("setenv");

1710

exit(1);

1711

}

1712

free(delaystring);

1713

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

1714

perror_plus("execl");

1715

} else {

1716

int status;

1717

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

1718

perror_plus("waitpid");

1719

free(fullname);

1720

continue;

1721

}

1722

if(WIFEXITED(status)){

1723

if(WEXITSTATUS(status) != 0){

1724

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

1725

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

1726

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

1727

WEXITSTATUS(status));

1728

free(fullname);

1729

continue;

1730

}

1731

} else if(WIFSIGNALED(status)){

1732

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

1733

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

1734

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

1735

WTERMSIG(status));

1736

free(fullname);

1737

continue;

1738

} else {

1739

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

1740

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

1741

direntry->d_name);

1742

free(fullname);

1743

continue;

1744

}

1745

}

1746

free(fullname);

1747

if(quit_now){

1748

goto end;

1749

}

1750

}

1751

close(devnull);

1718

struct stat st;

1719

1720

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

1721

int seckey_fd = open(seckey, O_RDONLY);

1722

if(seckey_fd == -1){

1723

perror_plus("open");

1724

} else {

1725

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

1726

if(ret == -1){

1727

perror_plus("fstat");

1728

} else {

1729

if(S_ISREG(st.st_mode)

1730

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

1731

ret = fchown(seckey_fd, uid, gid);

1732

if(ret == -1){

1733

perror_plus("fchown");

1734

}

1735

}

1736

}

1737

TEMP_FAILURE_RETRY(close(seckey_fd));

1738

}

1739

}

1740

1741

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

1742

int pubkey_fd = open(pubkey, O_RDONLY);

1743

if(pubkey_fd == -1){

1744

perror_plus("open");

1745

} else {

1746

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

1747

if(ret == -1){

1748

perror_plus("fstat");

1749

} else {

1750

if(S_ISREG(st.st_mode)

1751

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

1752

ret = fchown(pubkey_fd, uid, gid);

1753

if(ret == -1){

1754

perror_plus("fchown");

1755

}

1756

}

1757

}

1758

TEMP_FAILURE_RETRY(close(pubkey_fd));

1759

}

1760

}

1761

1762

/* Lower privileges */

1763

errno = 0;

1764

ret = seteuid(uid);

1765

if(ret == -1){

1766

perror_plus("seteuid");

1767

}

1752

1768

}

1753

1769

}

1754

1770

1771

/* Run network hooks */

1772

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

1773

goto end;

1774

}

1775

1755

1776

if(not debug){

1756

1777

avahi_set_log_function(empty_log);

1757

1778

}

1771

1792

/* Pick the first interface returned */

1772

1793

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

1773

1794

if(debug){

1774

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

1775

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

1795

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

1776

1796

}

1777

1797

if(interface == NULL){

1778

1798

perror_plus("malloc");

1783

1803

free(direntries);

1784

1804

} else {

1785

1805

free(direntries);

1786

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

1787

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

1806

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

1788

1807

exitcode = EXIT_FAILURE;

1789

1808

goto end;

1790

1809

}

1796

1815

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

1797

1816

mc.simple_poll = avahi_simple_poll_new();

1798

1817

if(mc.simple_poll == NULL){

1799

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

1800

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

1818

fprintf_plus(stderr,

1819

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

1801

1820

exitcode = EX_UNAVAILABLE;

1802

1821

goto end;

1803

1822

}

1869

1888

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

1870

1889

if_index = (AvahiIfIndex) if_nametoindex(interface);

1871

1890

if(if_index == 0){

1872

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

1873

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

1891

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

1874

1892

exitcode = EX_UNAVAILABLE;

1875

1893

goto end;

1876

1894

}

1996

2014

#endif /* __linux__ */

1997

2015

/* Lower privileges */

1998

2016

errno = 0;

1999

if(take_down_interface){

2000

/* Lower privileges */

2001

ret = seteuid(uid);

2002

if(ret == -1){

2003

perror_plus("seteuid");

2004

}

2005

} else {

2006

/* Lower privileges permanently */

2007

ret = setuid(uid);

2008

if(ret == -1){

2009

perror_plus("setuid");

2010

}

2017

/* Lower privileges */

2018

ret = seteuid(uid);

2019

if(ret == -1){

2020

perror_plus("seteuid");

2011

2021

}

2012

2022

}

2013

2023

2017

2027

2018

2028

ret = init_gnutls_global(pubkey, seckey);

2019

2029

if(ret == -1){

2020

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

2021

"init_gnutls_global failed\n");

2030

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

2022

2031

exitcode = EX_UNAVAILABLE;

2023

2032

goto end;

2024

2033

} else {

2040

2049

}

2041

2050

2042

2051

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

2043

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

2044

"init_gpgme failed\n");

2052

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

2045

2053

exitcode = EX_UNAVAILABLE;

2046

2054

goto end;

2047

2055

} else {

2057

2065

/* (Mainly meant for debugging) */

2058

2066

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

2059

2067

if(address == NULL){

2060

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

2061

"No colon in address\n");

2068

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

2062

2069

exitcode = EX_USAGE;

2063

2070

goto end;

2064

2071

}

2072

2079

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

2073

2080

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

2074

2081

or tmpmax != (uint16_t)tmpmax){

2075

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

2076

"Bad port number\n");

2082

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

2077

2083

exitcode = EX_USAGE;

2078

2084

goto end;

2079

2085

}

2109

2115

break;

2110

2116

}

2111

2117

if(debug){

2112

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

2113

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

2118

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

2119

(int)retry_interval);

2114

2120

}

2115

2121

sleep((int)retry_interval);

2116

2122

}

2146

2152

2147

2153

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

2148

2154

if(mc.server == NULL){

2149

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

2150

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

2151

avahi_strerror(error));

2155

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

2156

avahi_strerror(error));

2152

2157

exitcode = EX_UNAVAILABLE;

2153

2158

goto end;

2154

2159

}

2162

2167

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2163

2168

NULL, 0, browse_callback, NULL);

2164

2169

if(sb == NULL){

2165

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

2166

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

2167

avahi_strerror(avahi_server_errno(mc.server)));

2170

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

2171

avahi_strerror(avahi_server_errno(mc.server)));

2168

2172

exitcode = EX_UNAVAILABLE;

2169

2173

goto end;

2170

2174

}

2176

2180

/* Run the main loop */

2177

2181

2178

2182

if(debug){

2179

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

2180

"Starting Avahi loop search\n");

2183

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

2181

2184

}

2182

2185

2183

2186

ret = avahi_loop_with_timeout(mc.simple_poll,

2184

2187

(int)(retry_interval * 1000));

2185

2188

if(debug){

2186

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

2187

"avahi_loop_with_timeout exited %s\n",

2188

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

2189

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

2190

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

2189

2191

}

2190

2192

2191

2193

end:

2192

2194

2193

2195

if(debug){

2194

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

2195

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

2196

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

2196

2197

}

2197

2198

2199

/* Cleanup things */

2214

2215

if(gpgme_initialized){

2215

2216

gpgme_release(mc.ctx);

2216

2217

}

2217

2218

2219

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

2219

2220

has seen */

2220

2221

if(mc.current_server != NULL){

2226

2227

}

2227

2228

}

2228

2229

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

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2230

2232

2231

/* Take down the network interface */

2232

if(take_down_interface){

2233

/* Re-raise priviliges */

2233

/* Re-raise priviliges */

2234

{

2234

2235

errno = 0;

2235

2236

ret = seteuid(0);

2236

2237

if(ret == -1){

2237

2238

perror_plus("seteuid");

2238

2239

}

2239

if(geteuid() == 0){

2240

2241

/* Take down the network interface */

2242

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

2240

2243

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

2241

2244

if(ret == -1){

2242

2245

perror_plus("ioctl SIOCGIFFLAGS");

2251

2254

if(ret == -1){

2252

2255

perror_plus("close");

2253

2256

}

2254

/* Lower privileges permanently */

2255

errno = 0;

2256

ret = setuid(uid);

2257

if(ret == -1){

2258

perror_plus("setuid");

2259

}

2260

2257

}

2261

2258

}

2259

/* Lower privileges permanently */

2260

errno = 0;

2261

ret = setuid(uid);

2262

if(ret == -1){

2263

perror_plus("setuid");

2264

}

2262

2265

2263

2266

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

2264

2267

if(tempdir_created){

2278

2281

}

2279

2282

ret = remove(fullname);

2280

2283

if(ret == -1){

2281

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

2282

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

2284

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

2285

strerror(errno));

2283

2286

}

2284

2287

free(fullname);

2285

2288

}