/mandos/release : revision 237.16.10

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

#include <sys/stat.h> /* open() */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

59

#include <fcntl.h> /* open() */

85

raise() */

86

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

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

89

WEXITSTATUS(), WTERMSIG() */

88

90

89

91

#ifdef __linux__

90

92

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

108

110

init_gnutls_session(),

109

111

GNUTLS_* */

110

112

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

113

/* gnutls_certificate_set_openpgp_key_file(),

114

GNUTLS_OPENPGP_FMT_BASE64 */

113

115

114

116

/* GPGME */

115

117

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

131

133

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

132

134

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

133

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

134

137

135

138

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

136

139

typedef struct server{

175

178

va_list ap;

176

179

va_start (ap, format);

177

180

178

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

181

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

182

program_invocation_short_name));

179

183

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

180

184

}

181

185

189

* "buffer_length" is how much is already used.

186

190

*/

187

191

size_t incbuffer(char **buffer, size_t buffer_length,

188

size_t buffer_capacity){

192

size_t buffer_capacity){

189

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

190

194

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

191

195

if(buffer == NULL){

197

201

}

198

202

199

203

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

200

int add_server(const char *ip, uint16_t port,

201

AvahiIfIndex if_index,

202

int af){

204

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

205

int af){

203

206

int ret;

204

207

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

205

208

if(new_server == NULL){

207

210

return -1;

208

211

}

209

212

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

210

.port = port,

211

.if_index = if_index,

212

.af = af };

213

.port = port,

214

.if_index = if_index,

215

.af = af };

213

216

if(new_server->ip == NULL){

214

217

perror_plus("strdup");

215

218

return -1;

237

240

/*

238

241

* Initialize GPGME.

239

242

*/

240

static bool init_gpgme(const char *seckey,

241

const char *pubkey, const char *tempdir){

243

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

244

const char *tempdir){

242

245

gpgme_error_t rc;

243

246

gpgme_engine_info_t engine_info;

244

247

259

262

260

263

rc = gpgme_data_new_from_fd(&pgp_data, fd);

261

264

if(rc != GPG_ERR_NO_ERROR){

262

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

263

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));

264

267

return false;

265

268

}

266

269

267

270

rc = gpgme_op_import(mc.ctx, pgp_data);

268

271

if(rc != GPG_ERR_NO_ERROR){

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

271

274

return false;

272

275

}

273

276

280

283

}

281

284

282

285

if(debug){

283

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

286

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

284

287

}

285

288

286

289

/* Init GPGME */

287

290

gpgme_check_version(NULL);

288

291

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

289

292

if(rc != GPG_ERR_NO_ERROR){

290

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

291

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));

292

295

return false;

293

296

}

294

297

295

298

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

296

299

rc = gpgme_get_engine_info(&engine_info);

297

300

if(rc != GPG_ERR_NO_ERROR){

298

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

299

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));

300

303

return false;

301

304

}

302

305

while(engine_info != NULL){

308

311

engine_info = engine_info->next;

309

312

}

310

313

if(engine_info == NULL){

311

fprintf(stderr, "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, "bad gpgme_new: %s: %s\n",

319

gpgme_strsource(rc), 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));

320

325

return false;

321

326

}

322

327

341

346

ssize_t plaintext_length = 0;

342

347

343

348

if(debug){

344

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

349

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

345

350

}

346

351

347

352

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

348

353

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

349

354

0);

350

355

if(rc != GPG_ERR_NO_ERROR){

351

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

352

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));

353

358

return -1;

354

359

}

355

360

356

361

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

357

362

rc = gpgme_data_new(&dh_plain);

358

363

if(rc != GPG_ERR_NO_ERROR){

359

fprintf(stderr, "bad gpgme_data_new: %s: %s\n",

360

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));

361

367

gpgme_data_release(dh_crypto);

362

368

return -1;

363

369

}

366

372

data buffer */

367

373

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

368

374

if(rc != GPG_ERR_NO_ERROR){

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

371

377

plaintext_length = -1;

372

378

if(debug){

373

379

gpgme_decrypt_result_t result;

374

380

result = gpgme_op_decrypt_result(mc.ctx);

375

381

if(result == NULL){

376

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

382

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

377

383

} else {

378

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

379

result->unsupported_algorithm);

380

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

381

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);

382

388

if(result->file_name != NULL){

383

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

389

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

384

390

}

385

391

gpgme_recipient_t recipient;

386

392

recipient = result->recipients;

387

393

while(recipient != NULL){

388

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

389

gpgme_pubkey_algo_name(recipient->pubkey_algo));

390

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

391

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

392

recipient->status == GPG_ERR_NO_SECKEY

393

? "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");

394

401

recipient = recipient->next;

395

402

}

396

403

}

399

406

}

400

407

401

408

if(debug){

402

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

409

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

403

410

}

404

411

405

412

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

412

419

*plaintext = NULL;

413

420

while(true){

414

421

plaintext_capacity = incbuffer(plaintext,

415

(size_t)plaintext_length,

416

plaintext_capacity);

422

(size_t)plaintext_length,

423

plaintext_capacity);

417

424

if(plaintext_capacity == 0){

418

perror_plus("incbuffer");

419

plaintext_length = -1;

420

goto decrypt_end;

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

421

428

}

422

429

423

430

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

436

443

}

437

444

438

445

if(debug){

439

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

446

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

440

447

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

441

448

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

442

449

}

464

471

/* GnuTLS log function callback */

465

472

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

466

473

const char* string){

467

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

474

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

468

475

}

469

476

470

477

static int init_gnutls_global(const char *pubkeyfilename,

472

479

int ret;

473

480

474

481

if(debug){

475

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

482

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

476

483

}

477

484

478

485

ret = gnutls_global_init();

479

486

if(ret != GNUTLS_E_SUCCESS){

480

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

481

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

482

489

return -1;

483

490

}

484

491

493

500

/* OpenPGP credentials */

494

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

495

502

if(ret != GNUTLS_E_SUCCESS){

496

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

497

safer_gnutls_strerror(ret));

503

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

504

safer_gnutls_strerror(ret));

498

505

gnutls_global_deinit();

499

506

return -1;

500

507

}

501

508

502

509

if(debug){

503

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

504

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

505

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);

506

514

}

507

515

508

516

ret = gnutls_certificate_set_openpgp_key_file

509

517

(mc.cred, pubkeyfilename, seckeyfilename,

510

518

GNUTLS_OPENPGP_FMT_BASE64);

511

519

if(ret != GNUTLS_E_SUCCESS){

512

fprintf(stderr,

513

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

514

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

515

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

516

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));

517

525

goto globalfail;

518

526

}

519

527

520

528

/* GnuTLS server initialization */

521

529

ret = gnutls_dh_params_init(&mc.dh_params);

522

530

if(ret != GNUTLS_E_SUCCESS){

523

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

524

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

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

525

534

goto globalfail;

526

535

}

527

536

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

528

537

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

538

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

539

safer_gnutls_strerror(ret));

531

540

goto globalfail;

532

541

}

533

542

553

562

}

554

563

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

555

564

if(ret != GNUTLS_E_SUCCESS){

556

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

557

safer_gnutls_strerror(ret));

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

558

568

}

559

569

560

570

{

567

577

}

568

578

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

569

579

if(ret != GNUTLS_E_SUCCESS){

570

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

571

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

572

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));

573

583

gnutls_deinit(*session);

574

584

return -1;

575

585

}

584

594

}

585

595

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

586

596

if(ret != GNUTLS_E_SUCCESS){

587

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

588

safer_gnutls_strerror(ret));

597

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

598

safer_gnutls_strerror(ret));

589

599

gnutls_deinit(*session);

590

600

return -1;

591

601

}

636

646

pf = PF_INET;

637

647

break;

638

648

default:

639

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

649

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

640

650

errno = EINVAL;

641

651

return -1;

642

652

}

647

657

}

648

658

649

659

if(debug){

650

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

651

"\n", ip, port);

660

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

661

PRIu16 "\n", ip, port);

652

662

}

653

663

654

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

680

690

}

681

691

if(ret == 0){

682

692

int e = errno;

683

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

693

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

684

694

errno = e;

685

695

goto mandos_end;

686

696

}

691

701

692

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

693

703

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

694

-Wunreachable-code*/

704

-Wunreachable-code*/

695

705

if(if_index == AVAHI_IF_UNSPEC){

696

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

697

" without a network interface\n");

706

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

707

" incomplete without a network interface\n");

698

708

errno = EINVAL;

699

709

goto mandos_end;

700

710

}

718

728

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

719

729

perror_plus("if_indextoname");

720

730

} else {

721

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

722

ip, interface, port);

731

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

732

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

723

733

}

724

734

} else {

725

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

726

port);

735

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

736

ip, port);

727

737

}

728

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

729

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

739

749

perror_plus("inet_ntop");

740

750

} else {

741

751

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

742

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

752

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

743

753

}

744

754

}

745

755

}

773

783

while(true){

774

784

size_t out_size = strlen(out);

775

785

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

776

out_size - written));

786

out_size - written));

777

787

if(ret == -1){

778

788

int e = errno;

779

789

perror_plus("write");

799

809

}

800

810

801

811

if(debug){

802

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

812

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

803

813

}

804

814

805

815

if(quit_now){

825

835

826

836

if(ret != GNUTLS_E_SUCCESS){

827

837

if(debug){

828

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

838

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

829

839

gnutls_perror(ret);

830

840

}

831

841

errno = EPROTO;

835

845

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

836

846

837

847

if(debug){

838

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

839

ip);

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

840

850

}

841

851

842

852

while(true){

847

857

}

848

858

849

859

buffer_capacity = incbuffer(&buffer, buffer_length,

850

buffer_capacity);

860

buffer_capacity);

851

861

if(buffer_capacity == 0){

852

862

int e = errno;

853

863

perror_plus("incbuffer");

880

890

}

881

891

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

882

892

if(ret < 0){

883

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

893

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

894

"***\n");

884

895

gnutls_perror(ret);

885

896

errno = EPROTO;

886

897

goto mandos_end;

887

898

}

888

899

break;

889

900

default:

890

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

891

" encrypted session with Mandos server\n");

901

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

902

" encrypted session with Mandos server\n");

892

903

gnutls_bye(session, GNUTLS_SHUT_RDWR);

893

904

errno = EIO;

894

905

goto mandos_end;

899

910

}

900

911

901

912

if(debug){

902

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

913

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

903

914

}

904

915

905

916

if(quit_now){

917

928

918

929

if(buffer_length > 0){

919

930

ssize_t decrypted_buffer_size;

920

decrypted_buffer_size = pgp_packet_decrypt(buffer,

921

buffer_length,

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

922

932

&decrypted_buffer);

923

933

if(decrypted_buffer_size >= 0){

924

934

935

945

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

936

946

int e = errno;

937

947

if(debug){

938

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

939

strerror(errno));

948

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

949

strerror(errno));

940

950

}

941

951

errno = e;

942

952

goto mandos_end;

999

1009

switch(event){

1000

1010

default:

1001

1011

case AVAHI_RESOLVER_FAILURE:

1002

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

1003

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

1004

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)));

1005

1016

break;

1006

1017

1007

1018

case AVAHI_RESOLVER_FOUND:

1009

1020

char ip[AVAHI_ADDRESS_STR_MAX];

1010

1021

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

1011

1022

if(debug){

1012

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

1013

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

1014

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);

1015

1026

}

1016

1027

int ret = start_mandos_communication(ip, port, interface,

1017

1028

avahi_proto_to_af(proto));

1049

1060

default:

1050

1061

case AVAHI_BROWSER_FAILURE:

1051

1062

1052

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

1053

avahi_strerror(avahi_server_errno(mc.server)));

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1054

1065

avahi_simple_poll_quit(mc.simple_poll);

1055

1066

return;

1056

1067

1063

1074

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

1064

1075

name, type, domain, protocol, 0,

1065

1076

resolve_callback, NULL) == NULL)

1066

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

1067

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)));

1068

1080

break;

1069

1081

1070

1082

case AVAHI_BROWSER_REMOVE:

1073

1085

case AVAHI_BROWSER_ALL_FOR_NOW:

1074

1086

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1075

1087

if(debug){

1076

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

1088

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

1089

" searching...\n");

1077

1090

}

1078

1091

break;

1079

1092

}

1118

1131

/* Reject the loopback device */

1119

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1120

1133

if(debug){

1121

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

1122

ifname);

1134

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

1135

ifname);

1123

1136

}

1124

1137

return false;

1125

1138

}

1126

1139

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

1127

1140

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

1128

1141

if(debug){

1129

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1130

ifname);

1142

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

1143

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

1131

1144

}

1132

1145

return true;

1133

1146

}

1134

1147

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

1135

1148

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

1136

1149

if(debug){

1137

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1138

ifname);

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1139

1152

}

1140

1153

return false;

1141

1154

}

1142

1155

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

1143

1156

if(ifr->ifr_flags & IFF_NOARP){

1144

1157

if(debug){

1145

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

1158

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

1159

ifname);

1146

1160

}

1147

1161

return false;

1148

1162

}

1149

1163

1150

1164

/* Accept this device */

1151

1165

if(debug){

1152

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

1166

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

1153

1167

}

1154

1168

return true;

1155

1169

}

1160

1174

* (This function is passed to scandir(3) as a filter function.)

1161

1175

*/

1162

1176

int good_interface(const struct dirent *if_entry){

1163

int ret;

1164

1177

if(if_entry->d_name[0] == '.'){

1165

1178

return 0;

1166

1179

}

1180

1167

1181

struct ifreq ifr;

1168

1169

1182

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

1183

if(debug){

1184

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

1185

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

1186

}

1170

1187

return 0;

1171

1188

}

1172

1189

1182

1199

* (This function is passed to scandir(3) as a filter function.)

1183

1200

*/

1184

1201

int up_interface(const struct dirent *if_entry){

1185

ssize_t ssret;

1186

char *flagname = NULL;

1187

1202

if(if_entry->d_name[0] == '.'){

1188

1203

return 0;

1189

1204

}

1190

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1191

if_entry->d_name);

1192

if(ret < 0){

1193

perror_plus("asprintf");

1194

return 0;

1195

}

1196

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1197

if(flags_fd == -1){

1198

perror_plus("open");

1199

free(flagname);

1200

return 0;

1201

}

1202

free(flagname);

1203

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1204

/* read line from flags_fd */

1205

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1206

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1207

flagstring[(size_t)to_read] = '\0';

1208

if(flagstring == NULL){

1209

perror_plus("malloc");

1210

close(flags_fd);

1211

return 0;

1212

}

1213

while(to_read > 0){

1214

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1215

(size_t)to_read));

1216

if(ssret == -1){

1217

perror_plus("read");

1218

free(flagstring);

1219

close(flags_fd);

1220

return 0;

1221

}

1222

to_read -= ssret;

1223

if(ssret == 0){

1224

break;

1225

}

1226

}

1227

close(flags_fd);

1228

intmax_t tmpmax;

1229

char *tmp;

1230

errno = 0;

1231

tmpmax = strtoimax(flagstring, &tmp, 0);

1232

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1233

and not (isspace(*tmp)))

1234

or tmpmax != (ifreq_flags)tmpmax){

1235

if(debug){

1236

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1237

flagstring, if_entry->d_name);

1238

}

1239

free(flagstring);

1240

return 0;

1241

}

1242

free(flagstring);

1243

ifreq_flags flags = (ifreq_flags)tmpmax;

1244

/* Reject the loopback device */

1245

if(flags & IFF_LOOPBACK){

1246

if(debug){

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1205

1206

struct ifreq ifr;

1207

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

1208

if(debug){

1209

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

1210

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

1211

}

1212

return 0;

1213

}

1214

1253

1215

/* Reject down interfaces */

1254

if(not (flags & IFF_UP)){

1255

return 0;

1256

}

1257

1258

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

1259

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1260

if(debug){

1261

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1262

if_entry->d_name);

1263

}

1264

return 1;

1265

}

1266

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

1267

if(not (flags & IFF_BROADCAST)){

1268

if(debug){

1269

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

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

1275

if(flags & IFF_NOARP){

1276

if(debug){

1277

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

1278

if_entry->d_name);

1279

}

1280

return 0;

1281

}

1282

/* Accept this device */

1283

if(debug){

1284

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1285

if_entry->d_name);

1216

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

1217

if(debug){

1218

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

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

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

1226

if(debug){

1227

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

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

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

1234

return 0;

1286

1235

}

1287

1236

return 1;

1288

1237

}

1301

1250

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

1302

1251

int runnable_hook(const struct dirent *direntry){

1303

1252

int ret;

1253

size_t sret;

1304

1254

struct stat st;

1305

1255

1306

1256

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

1308

1258

return 0;

1309

1259

}

1310

1260

1311

/* Save pointer to last character */

1312

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

1313

1314

if(*end == '~'){

1315

/* Backup name~ */

1316

return 0;

1317

}

1318

1319

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

1320

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

1321

/* Temporary #name# */

1322

return 0;

1323

}

1324

1325

/* XXX more rules here */

1326

1327

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

1261

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

1262

"abcdefghijklmnopqrstuvwxyz"

1263

"0123456789"

1264

"_-");

1265

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

1266

/* Contains non-allowed characters */

1267

if(debug){

1268

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

1269

direntry->d_name);

1270

}

1271

return 0;

1272

}

1273

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1328

1282

if(ret == -1){

1329

1283

if(debug){

1330

perror_plus("Could not stat plugin");

1284

perror_plus("Could not stat hook");

1331

1285

}

1332

1286

return 0;

1333

1287

}

1334

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

1288

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

1335

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1336

1294

return 0;

1337

1295

}

1338

1296

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

1339

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1340

1302

return 0;

1341

1303

}

1342

1304

return 1;

1351

1313

while(true){

1352

1314

if(mc.current_server == NULL){

1353

1315

if (debug){

1354

fprintf(stderr,

1355

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

1316

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

1317

" No timeout!\n");

1356

1318

}

1357

1319

ret = avahi_simple_poll_iterate(s, -1);

1358

1320

} else {

1359

1321

if (debug){

1360

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

1361

" or wait\n");

1322

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

1323

" it, or wait\n");

1362

1324

}

1363

1325

/* the current time */

1364

1326

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1380

1342

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

1381

1343

1382

1344

if (debug){

1383

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

1345

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

1346

block_time);

1384

1347

}

1385

1348

1386

1349

if(block_time <= 0){

1406

1369

ret = avahi_simple_poll_iterate(s, (int)block_time);

1407

1370

}

1408

1371

if(ret != 0){

1409

if (ret > 0 or errno != EINTR) {

1372

if (ret > 0 or errno != EINTR){

1410

1373

return (ret != 1) ? ret : 0;

1411

1374

}

1412

1375

}

1413

1376

}

1414

1377

}

1415

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

1416

1477

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

1417

1478

AvahiSServiceBrowser *sb = NULL;

1418

1479

int error;

1500

1561

.arg = "SECONDS",

1501

1562

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

1502

1563

.group = 2 },

1564

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

1565

.arg = "DIR",

1566

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

1567

.group = 2 },

1503

1568

/*

1504

1569

* These reproduce what we would get without ARGP_NO_HELP

1505

1570

*/

1558

1623

argp_error(state, "Bad retry interval");

1559

1624

}

1560

1625

break;

1626

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

1627

hookdir = arg;

1628

break;

1561

1629

/*

1562

1630

* These reproduce what we would get without ARGP_NO_HELP

1563

1631

*/

1569

1637

argp_state_help(state, state->out_stream,

1570

1638

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1571

1639

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

1572

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);

1573

1643

exit(argp_err_exit_status);

1574

1644

break;

1575

1645

default:

1620

1690

if(ret == -1){

1621

1691

perror_plus("fstat");

1622

1692

} else {

1623

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){

1624

1695

ret = fchown(seckey_fd, uid, gid);

1625

1696

if(ret == -1){

1626

1697

perror_plus("fchown");

1640

1711

if(ret == -1){

1641

1712

perror_plus("fstat");

1642

1713

} else {

1643

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){

1644

1716

ret = fchown(pubkey_fd, uid, gid);

1645

1717

if(ret == -1){

1646

1718

perror_plus("fchown");

1659

1731

}

1660

1732

}

1661

1733

1662

/* Find network hooks and run them */

1734

/* Run network hooks */

1663

1735

{

1664

struct dirent **direntries;

1665

struct dirent *direntry;

1666

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

1667

alphasort);

1668

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

1669

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

1670

direntry = direntries[0];

1671

char *fullname = NULL;

1672

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

1673

direntry->d_name);

1674

if(ret < 0){

1675

perror_plus("asprintf");

1676

continue;

1677

}

1678

pid_t hook_pid = fork();

1679

if(hook_pid == 0){

1680

/* Child */

1681

dup2(devnull, STDIN_FILENO);

1682

close(devnull);

1683

dup2(STDERR_FILENO, STDOUT_FILENO);

1684

setenv("DEVICE", interface, 1);

1685

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

1686

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

1687

/* setenv( XXX more here */

1688

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

1689

perror_plus("execl");

1690

}

1691

free(fullname);

1692

if(quit_now){

1693

goto end;

1694

}

1695

}

1696

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");

1750

}

1697

1751

}

1698

1752

1699

1753

if(not debug){

1702

1756

1703

1757

if(interface[0] == '\0'){

1704

1758

struct dirent **direntries;

1705

ret = scandir(sys_class_net, &direntries, good_interface,

1759

/* First look for interfaces that are up */

1760

ret = scandir(sys_class_net, &direntries, up_interface,

1706

1761

alphasort);

1762

if(ret == 0){

1763

/* No up interfaces, look for any good interfaces */

1764

free(direntries);

1765

ret = scandir(sys_class_net, &direntries, good_interface,

1766

alphasort);

1767

}

1707

1768

if(ret >= 1){

1708

/* Pick the first good interface */

1769

/* Pick the first interface returned */

1709

1770

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

1710

1771

if(debug){

1711

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

1772

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

1712

1773

}

1713

1774

if(interface == NULL){

1714

1775

perror_plus("malloc");

1719

1780

free(direntries);

1720

1781

} else {

1721

1782

free(direntries);

1722

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

1783

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

1723

1784

exitcode = EXIT_FAILURE;

1724

1785

goto end;

1725

1786

}

1731

1792

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

1732

1793

mc.simple_poll = avahi_simple_poll_new();

1733

1794

if(mc.simple_poll == NULL){

1734

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

1795

fprintf_plus(stderr,

1796

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

1735

1797

exitcode = EX_UNAVAILABLE;

1736

1798

goto end;

1737

1799

}

1803

1865

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

1804

1866

if_index = (AvahiIfIndex) if_nametoindex(interface);

1805

1867

if(if_index == 0){

1806

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

1868

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

1807

1869

exitcode = EX_UNAVAILABLE;

1808

1870

goto end;

1809

1871

}

1929

1991

#endif /* __linux__ */

1930

1992

/* Lower privileges */

1931

1993

errno = 0;

1932

if(take_down_interface){

1933

/* Lower privileges */

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

1938

} else {

1939

/* Lower privileges permanently */

1940

ret = setuid(uid);

1941

if(ret == -1){

1942

perror_plus("setuid");

1943

}

1994

/* Lower privileges */

1995

ret = seteuid(uid);

1996

if(ret == -1){

1997

perror_plus("seteuid");

1944

1998

}

1945

1999

}

1946

2000

1950

2004

1951

2005

ret = init_gnutls_global(pubkey, seckey);

1952

2006

if(ret == -1){

1953

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

2007

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

1954

2008

exitcode = EX_UNAVAILABLE;

1955

2009

goto end;

1956

2010

} else {

1972

2026

}

1973

2027

1974

2028

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

1975

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

2029

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

1976

2030

exitcode = EX_UNAVAILABLE;

1977

2031

goto end;

1978

2032

} else {

1988

2042

/* (Mainly meant for debugging) */

1989

2043

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

1990

2044

if(address == NULL){

1991

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

2045

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

1992

2046

exitcode = EX_USAGE;

1993

2047

goto end;

1994

2048

}

2002

2056

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

2003

2057

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

2004

2058

or tmpmax != (uint16_t)tmpmax){

2005

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

2059

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

2006

2060

exitcode = EX_USAGE;

2007

2061

goto end;

2008

2062

}

2038

2092

break;

2039

2093

}

2040

2094

if(debug){

2041

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

2042

(int)retry_interval);

2095

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

2096

(int)retry_interval);

2043

2097

}

2044

2098

sleep((int)retry_interval);

2045

2099

}

2075

2129

2076

2130

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

2077

2131

if(mc.server == NULL){

2078

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

2079

avahi_strerror(error));

2132

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

2133

avahi_strerror(error));

2080

2134

exitcode = EX_UNAVAILABLE;

2081

2135

goto end;

2082

2136

}

2090

2144

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2091

2145

NULL, 0, browse_callback, NULL);

2092

2146

if(sb == NULL){

2093

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

2094

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)));

2095

2149

exitcode = EX_UNAVAILABLE;

2096

2150

goto end;

2097

2151

}

2103

2157

/* Run the main loop */

2104

2158

2105

2159

if(debug){

2106

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

2160

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

2107

2161

}

2108

2162

2109

2163

ret = avahi_loop_with_timeout(mc.simple_poll,

2110

2164

(int)(retry_interval * 1000));

2111

2165

if(debug){

2112

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

2113

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

2166

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

2167

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

2114

2168

}

2115

2169

2116

2170

end:

2117

2171

2118

2172

if(debug){

2119

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

2173

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

2120

2174

}

2121

2175

2122

2176

/* Cleanup things */

2150

2204

}

2151

2205

}

2152

2206

2153

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

2154

2155

/* Take down the network interface */

2156

if(take_down_interface){

2157

/* Re-raise priviliges */

2207

/* Re-raise priviliges */

2208

{

2158

2209

errno = 0;

2159

2210

ret = seteuid(0);

2160

2211

if(ret == -1){

2161

2212

perror_plus("seteuid");

2162

2213

}

2163

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){

2164

2221

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

2165

2222

if(ret == -1){

2166

2223

perror_plus("ioctl SIOCGIFFLAGS");

2167

} else if(network.ifr_flags & IFF_UP) {

2224

} else if(network.ifr_flags & IFF_UP){

2168

2225

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

2169

2226

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

2170

2227

if(ret == -1){

2175

2232

if(ret == -1){

2176

2233

perror_plus("close");

2177

2234

}

2178

/* Lower privileges permanently */

2179

errno = 0;

2180

ret = setuid(uid);

2181

if(ret == -1){

2182

perror_plus("setuid");

2183

}

2184

2235

}

2185

2236

}

2237

/* Lower privileges permanently */

2238

errno = 0;

2239

ret = setuid(uid);

2240

if(ret == -1){

2241

perror_plus("setuid");

2242

}

2186

2243

2187

2244

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

2188

2245

if(tempdir_created){

2202

2259

}

2203

2260

ret = remove(fullname);

2204

2261

if(ret == -1){

2205

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

2206

strerror(errno));

2262

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

2263

strerror(errno));

2207

2264

}

2208

2265

free(fullname);

2209

2266

}