/mandos/trunk : revision 505.3.11

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

123

125

#define PATHDIR "/conf/conf.d/mandos"

124

126

#define SECKEY "seckey.txt"

125

127

#define PUBKEY "pubkey.txt"

128

#define HOOKDIR "/lib/mandos/network-hooks.d"

126

129

127

130

bool debug = false;

128

131

static const char mandos_protocol_version[] = "1";

130

133

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

131

134

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

132

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

133

137

134

138

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

135

139

typedef struct server{

170

174

perror(print_text);

171

175

}

172

176

177

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

178

va_list ap;

179

va_start (ap, format);

180

181

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

182

program_invocation_short_name));

183

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

184

}

185

173

186

/*

174

187

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

175

188

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

176

189

* "buffer_length" is how much is already used.

177

190

*/

178

191

size_t incbuffer(char **buffer, size_t buffer_length,

179

size_t buffer_capacity){

192

size_t buffer_capacity){

180

193

if(buffer_length + BUFFER_SIZE > buffer_capacity){

181

194

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

182

195

if(buffer == NULL){

188

201

}

189

202

190

203

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

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

204

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

205

int af){

194

206

int ret;

195

207

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

196

208

if(new_server == NULL){

198

210

return -1;

199

211

}

200

212

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

201

.port = port,

202

.if_index = if_index,

203

.af = af };

213

.port = port,

214

.if_index = if_index,

215

.af = af };

204

216

if(new_server->ip == NULL){

205

217

perror_plus("strdup");

206

218

return -1;

228

240

/*

229

241

* Initialize GPGME.

230

242

*/

231

static bool init_gpgme(const char *seckey,

232

const char *pubkey, const char *tempdir){

243

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

244

const char *tempdir){

233

245

gpgme_error_t rc;

234

246

gpgme_engine_info_t engine_info;

235

247

250

262

251

263

rc = gpgme_data_new_from_fd(&pgp_data, fd);

252

264

if(rc != GPG_ERR_NO_ERROR){

253

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

254

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));

255

267

return false;

256

268

}

257

269

258

270

rc = gpgme_op_import(mc.ctx, pgp_data);

259

271

if(rc != GPG_ERR_NO_ERROR){

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

272

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

273

gpgme_strsource(rc), gpgme_strerror(rc));

262

274

return false;

263

275

}

264

276

271

283

}

272

284

273

285

if(debug){

274

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

286

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

275

287

}

276

288

277

289

/* Init GPGME */

278

290

gpgme_check_version(NULL);

279

291

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

280

292

if(rc != GPG_ERR_NO_ERROR){

281

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

282

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));

283

295

return false;

284

296

}

285

297

286

298

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

287

299

rc = gpgme_get_engine_info(&engine_info);

288

300

if(rc != GPG_ERR_NO_ERROR){

289

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

290

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));

291

303

return false;

292

304

}

293

305

while(engine_info != NULL){

299

311

engine_info = engine_info->next;

300

312

}

301

313

if(engine_info == NULL){

302

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);

303

316

return false;

304

317

}

305

318

306

319

/* Create new GPGME "context" */

307

320

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

308

321

if(rc != GPG_ERR_NO_ERROR){

309

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

310

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));

311

325

return false;

312

326

}

313

327

332

346

ssize_t plaintext_length = 0;

333

347

334

348

if(debug){

335

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

349

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

336

350

}

337

351

338

352

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

339

353

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

340

354

0);

341

355

if(rc != GPG_ERR_NO_ERROR){

342

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

343

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));

344

358

return -1;

345

359

}

346

360

347

361

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

348

362

rc = gpgme_data_new(&dh_plain);

349

363

if(rc != GPG_ERR_NO_ERROR){

350

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

351

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));

352

367

gpgme_data_release(dh_crypto);

353

368

return -1;

354

369

}

357

372

data buffer */

358

373

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

359

374

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

375

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

376

gpgme_strsource(rc), gpgme_strerror(rc));

362

377

plaintext_length = -1;

363

378

if(debug){

364

379

gpgme_decrypt_result_t result;

365

380

result = gpgme_op_decrypt_result(mc.ctx);

366

381

if(result == NULL){

367

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

382

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

368

383

} else {

369

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

370

result->unsupported_algorithm);

371

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

372

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);

373

388

if(result->file_name != NULL){

374

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

389

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

375

390

}

376

391

gpgme_recipient_t recipient;

377

392

recipient = result->recipients;

378

393

while(recipient != NULL){

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "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");

385

401

recipient = recipient->next;

386

402

}

387

403

}

390

406

}

391

407

392

408

if(debug){

393

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

409

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

394

410

}

395

411

396

412

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

403

419

*plaintext = NULL;

404

420

while(true){

405

421

plaintext_capacity = incbuffer(plaintext,

406

(size_t)plaintext_length,

407

plaintext_capacity);

422

(size_t)plaintext_length,

423

plaintext_capacity);

408

424

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

410

plaintext_length = -1;

411

goto decrypt_end;

425

perror_plus("incbuffer");

426

plaintext_length = -1;

427

goto decrypt_end;

412

428

}

413

429

414

430

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

427

443

}

428

444

429

445

if(debug){

430

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

446

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

431

447

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

432

448

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

433

449

}

455

471

/* GnuTLS log function callback */

456

472

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

457

473

const char* string){

458

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

474

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

459

475

}

460

476

461

477

static int init_gnutls_global(const char *pubkeyfilename,

463

479

int ret;

464

480

465

481

if(debug){

466

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

482

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

467

483

}

468

484

469

485

ret = gnutls_global_init();

470

486

if(ret != GNUTLS_E_SUCCESS){

471

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

472

safer_gnutls_strerror(ret));

487

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

488

safer_gnutls_strerror(ret));

473

489

return -1;

474

490

}

475

491

484

500

/* OpenPGP credentials */

485

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

486

502

if(ret != GNUTLS_E_SUCCESS){

487

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

488

safer_gnutls_strerror(ret));

503

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

504

safer_gnutls_strerror(ret));

489

505

gnutls_global_deinit();

490

506

return -1;

491

507

}

492

508

493

509

if(debug){

494

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

495

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

496

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);

497

514

}

498

515

499

516

ret = gnutls_certificate_set_openpgp_key_file

500

517

(mc.cred, pubkeyfilename, seckeyfilename,

501

518

GNUTLS_OPENPGP_FMT_BASE64);

502

519

if(ret != GNUTLS_E_SUCCESS){

503

fprintf(stderr,

504

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

505

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

506

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

507

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));

508

525

goto globalfail;

509

526

}

510

527

511

528

/* GnuTLS server initialization */

512

529

ret = gnutls_dh_params_init(&mc.dh_params);

513

530

if(ret != GNUTLS_E_SUCCESS){

514

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

515

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

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

532

" initialization: %s\n",

533

safer_gnutls_strerror(ret));

516

534

goto globalfail;

517

535

}

518

536

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

519

537

if(ret != GNUTLS_E_SUCCESS){

520

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

521

safer_gnutls_strerror(ret));

538

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

539

safer_gnutls_strerror(ret));

522

540

goto globalfail;

523

541

}

524

542

544

562

}

545

563

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

546

564

if(ret != GNUTLS_E_SUCCESS){

547

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

548

safer_gnutls_strerror(ret));

565

fprintf_plus(stderr,

566

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

567

safer_gnutls_strerror(ret));

549

568

}

550

569

551

570

{

558

577

}

559

578

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

560

579

if(ret != GNUTLS_E_SUCCESS){

561

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

562

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

563

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));

564

583

gnutls_deinit(*session);

565

584

return -1;

566

585

}

575

594

}

576

595

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

577

596

if(ret != GNUTLS_E_SUCCESS){

578

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

579

safer_gnutls_strerror(ret));

597

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

598

safer_gnutls_strerror(ret));

580

599

gnutls_deinit(*session);

581

600

return -1;

582

601

}

627

646

pf = PF_INET;

628

647

break;

629

648

default:

630

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

649

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

631

650

errno = EINVAL;

632

651

return -1;

633

652

}

638

657

}

639

658

640

659

if(debug){

641

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

642

"\n", ip, port);

660

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

661

PRIu16 "\n", ip, port);

643

662

}

644

663

645

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

671

690

}

672

691

if(ret == 0){

673

692

int e = errno;

674

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

693

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

675

694

errno = e;

676

695

goto mandos_end;

677

696

}

682

701

683

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

684

703

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

685

-Wunreachable-code*/

704

-Wunreachable-code*/

686

705

if(if_index == AVAHI_IF_UNSPEC){

687

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

688

" without a network interface\n");

706

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

707

" incomplete without a network interface\n");

689

708

errno = EINVAL;

690

709

goto mandos_end;

691

710

}

709

728

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

710

729

perror_plus("if_indextoname");

711

730

} else {

712

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

713

ip, interface, port);

731

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

732

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

714

733

}

715

734

} else {

716

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

717

port);

735

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

736

ip, port);

718

737

}

719

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

720

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

730

749

perror_plus("inet_ntop");

731

750

} else {

732

751

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

733

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

752

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

734

753

}

735

754

}

736

755

}

764

783

while(true){

765

784

size_t out_size = strlen(out);

766

785

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

767

out_size - written));

786

out_size - written));

768

787

if(ret == -1){

769

788

int e = errno;

770

789

perror_plus("write");

790

809

}

791

810

792

811

if(debug){

793

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

812

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

794

813

}

795

814

796

815

if(quit_now){

816

835

817

836

if(ret != GNUTLS_E_SUCCESS){

818

837

if(debug){

819

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

838

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

820

839

gnutls_perror(ret);

821

840

}

822

841

errno = EPROTO;

826

845

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

827

846

828

847

if(debug){

829

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

830

ip);

848

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

849

" %s\n", ip);

831

850

}

832

851

833

852

while(true){

838

857

}

839

858

840

859

buffer_capacity = incbuffer(&buffer, buffer_length,

841

buffer_capacity);

860

buffer_capacity);

842

861

if(buffer_capacity == 0){

843

862

int e = errno;

844

863

perror_plus("incbuffer");

871

890

}

872

891

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

873

892

if(ret < 0){

874

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

893

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

894

"***\n");

875

895

gnutls_perror(ret);

876

896

errno = EPROTO;

877

897

goto mandos_end;

878

898

}

879

899

break;

880

900

default:

881

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

882

" encrypted session with Mandos server\n");

901

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

902

" encrypted session with Mandos server\n");

883

903

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

904

errno = EIO;

885

905

goto mandos_end;

890

910

}

891

911

892

912

if(debug){

893

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

913

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

894

914

}

895

915

896

916

if(quit_now){

908

928

909

929

if(buffer_length > 0){

910

930

ssize_t decrypted_buffer_size;

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

912

buffer_length,

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

913

932

&decrypted_buffer);

914

933

if(decrypted_buffer_size >= 0){

915

934

926

945

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

927

946

int e = errno;

928

947

if(debug){

929

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

930

strerror(errno));

948

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

949

strerror(errno));

931

950

}

932

951

errno = e;

933

952

goto mandos_end;

990

1009

switch(event){

991

1010

default:

992

1011

case AVAHI_RESOLVER_FAILURE:

993

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

994

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

995

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)));

996

1016

break;

997

1017

998

1018

case AVAHI_RESOLVER_FOUND:

1000

1020

char ip[AVAHI_ADDRESS_STR_MAX];

1001

1021

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

1002

1022

if(debug){

1003

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

1004

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

1005

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);

1006

1026

}

1007

1027

int ret = start_mandos_communication(ip, port, interface,

1008

1028

avahi_proto_to_af(proto));

1040

1060

default:

1041

1061

case AVAHI_BROWSER_FAILURE:

1042

1062

1043

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

1044

avahi_strerror(avahi_server_errno(mc.server)));

1063

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

1064

avahi_strerror(avahi_server_errno(mc.server)));

1045

1065

avahi_simple_poll_quit(mc.simple_poll);

1046

1066

return;

1047

1067

1054

1074

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

1055

1075

name, type, domain, protocol, 0,

1056

1076

resolve_callback, NULL) == NULL)

1057

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

1058

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)));

1059

1080

break;

1060

1081

1061

1082

case AVAHI_BROWSER_REMOVE:

1064

1085

case AVAHI_BROWSER_ALL_FOR_NOW:

1065

1086

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1066

1087

if(debug){

1067

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

1088

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

1089

" searching...\n");

1068

1090

}

1069

1091

break;

1070

1092

}

1085

1107

errno = old_errno;

1086

1108

}

1087

1109

1088

/*

1089

* This function determines if a directory entry in /sys/class/net

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1110

bool get_flags(const char *ifname, struct ifreq *ifr){

1111

int ret;

1112

1113

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1114

if(s < 0){

1115

perror_plus("socket");

1116

return false;

1117

}

1118

strcpy(ifr->ifr_name, ifname);

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1120

if(ret == -1){

1144

1121

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1122

perror_plus("ioctl SIOCGIFFLAGS");

1147

1123

}

1148

free(flagstring);

1149

return 0;

1124

return false;

1150

1125

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1126

return true;

1127

}

1128

1129

bool good_flags(const char *ifname, const struct ifreq *ifr){

1130

1153

1131

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1132

if(ifr->ifr_flags & IFF_LOOPBACK){

1155

1133

if(debug){

1156

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

1157

if_entry->d_name);

1134

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

1135

ifname);

1158

1136

}

1159

return 0;

1137

return false;

1160

1138

}

1161

1139

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

1162

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

1140

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

1163

1141

if(debug){

1164

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

1165

if_entry->d_name);

1142

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

1143

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

1166

1144

}

1167

return 1;

1145

return true;

1168

1146

}

1169

1147

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

1170

if(not (flags & IFF_BROADCAST)){

1148

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

1171

1149

if(debug){

1172

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

1173

if_entry->d_name);

1150

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1151

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

1174

1152

}

1175

return 0;

1153

return false;

1176

1154

}

1177

1155

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

1178

if(flags & IFF_NOARP){

1156

if(ifr->ifr_flags & IFF_NOARP){

1179

1157

if(debug){

1180

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

1181

if_entry->d_name);

1158

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

1159

ifname);

1182

1160

}

1183

return 0;

1161

return false;

1184

1162

}

1163

1185

1164

/* Accept this device */

1186

1165

if(debug){

1187

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

1188

if_entry->d_name);

1166

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

1167

}

1168

return true;

1169

}

1170

1171

/*

1172

* This function determines if a directory entry in /sys/class/net

1173

* corresponds to an acceptable network device.

1174

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

1175

*/

1176

int good_interface(const struct dirent *if_entry){

1177

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

1178

return 0;

1179

}

1180

1181

struct ifreq ifr;

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

}

1187

return 0;

1188

}

1189

1190

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

1191

return 0;

1192

}

1193

return 1;

1194

}

1195

1196

/*

1197

* This function determines if a directory entry in /sys/class/net

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

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

1215

/* Reject down interfaces */

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;

1189

1235

}

1190

1236

return 1;

1191

1237

}

1201

1247

return 1;

1202

1248

}

1203

1249

1250

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

1251

int runnable_hook(const struct dirent *direntry){

1252

int ret;

1253

size_t sret;

1254

struct stat st;

1255

1256

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

1257

/* Empty name? */

1258

return 0;

1259

}

1260

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);

1282

if(ret == -1){

1283

if(debug){

1284

perror_plus("Could not stat hook");

1285

}

1286

return 0;

1287

}

1288

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

1289

/* Not a regular file */

1290

if(debug){

1291

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

1292

direntry->d_name);

1293

}

1294

return 0;

1295

}

1296

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

1297

/* Not executable */

1298

if(debug){

1299

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

1300

direntry->d_name);

1301

}

1302

return 0;

1303

}

1304

return 1;

1305

}

1306

1204

1307

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

1308

int ret;

1206

1309

struct timespec now;

1210

1313

while(true){

1211

1314

if(mc.current_server == NULL){

1212

1315

if (debug){

1213

fprintf(stderr,

1214

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

1316

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

1317

" No timeout!\n");

1215

1318

}

1216

1319

ret = avahi_simple_poll_iterate(s, -1);

1217

1320

} else {

1218

1321

if (debug){

1219

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

1220

" or wait\n");

1322

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

1323

" it, or wait\n");

1221

1324

}

1222

1325

/* the current time */

1223

1326

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1239

1342

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

1240

1343

1241

1344

if (debug){

1242

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

1345

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

1346

block_time);

1243

1347

}

1244

1348

1245

1349

if(block_time <= 0){

1265

1369

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

1266

1370

}

1267

1371

if(ret != 0){

1268

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

1372

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

1269

1373

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

1270

1374

}

1271

1375

}

1272

1376

}

1273

1377

}

1274

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[i];

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

if(debug){

1399

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

1400

direntry->d_name);

1401

}

1402

pid_t hook_pid = fork();

1403

if(hook_pid == 0){

1404

/* Child */

1405

dup2(devnull, STDIN_FILENO);

1406

close(devnull);

1407

dup2(STDERR_FILENO, STDOUT_FILENO);

1408

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

1409

if(ret == -1){

1410

perror_plus("setenv");

1411

return false;

1412

}

1413

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

1414

if(ret == -1){

1415

perror_plus("setenv");

1416

return false;

1417

}

1418

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

1419

if(ret == -1){

1420

perror_plus("setenv");

1421

return false;

1422

}

1423

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

1424

if(ret == -1){

1425

perror_plus("setenv");

1426

return false;

1427

}

1428

char *delaystring;

1429

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

1430

if(ret == -1){

1431

perror_plus("asprintf");

1432

return false;

1433

}

1434

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

1435

if(ret == -1){

1436

free(delaystring);

1437

perror_plus("setenv");

1438

return false;

1439

}

1440

free(delaystring);

1441

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

1442

perror_plus("execl");

1443

} else {

1444

int status;

1445

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

1446

perror_plus("waitpid");

1447

free(fullname);

1448

continue;

1449

}

1450

if(WIFEXITED(status)){

1451

if(WEXITSTATUS(status) != 0){

1452

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

1453

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

1454

WEXITSTATUS(status));

1455

free(fullname);

1456

continue;

1457

}

1458

} else if(WIFSIGNALED(status)){

1459

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

1460

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

1461

WTERMSIG(status));

1462

free(fullname);

1463

continue;

1464

} else {

1465

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

1466

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

1467

free(fullname);

1468

continue;

1469

}

1470

}

1471

free(fullname);

1472

if(quit_now){

1473

break;

1474

}

1475

}

1476

close(devnull);

1477

}

1478

return true;

1479

}

1480

1275

1481

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

1276

1482

AvahiSServiceBrowser *sb = NULL;

1277

1483

int error;

1359

1565

.arg = "SECONDS",

1360

1566

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

1361

1567

.group = 2 },

1568

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

1569

.arg = "DIR",

1570

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

1571

.group = 2 },

1362

1572

/*

1363

1573

* These reproduce what we would get without ARGP_NO_HELP

1364

1574

*/

1417

1627

argp_error(state, "Bad retry interval");

1418

1628

}

1419

1629

break;

1630

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

1631

hookdir = arg;

1632

break;

1420

1633

/*

1421

1634

* These reproduce what we would get without ARGP_NO_HELP

1422

1635

*/

1428

1641

argp_state_help(state, state->out_stream,

1429

1642

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

1643

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

1431

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

1644

fprintf_plus(state->out_stream,

1645

"Mandos plugin mandos-client: ");

1646

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

1432

1647

exit(argp_err_exit_status);

1433

1648

break;

1434

1649

default:

1458

1673

}

1459

1674

}

1460

1675

1461

{

1676

if(getuid() == 0){

1462

1677

/* Work around Debian bug #633582:

1463

1678

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

1464

1679

struct stat st;

1479

1694

if(ret == -1){

1480

1695

perror_plus("fstat");

1481

1696

} else {

1482

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

1697

if(S_ISREG(st.st_mode)

1698

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

1483

1699

ret = fchown(seckey_fd, uid, gid);

1484

1700

if(ret == -1){

1485

1701

perror_plus("fchown");

1499

1715

if(ret == -1){

1500

1716

perror_plus("fstat");

1501

1717

} else {

1502

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

1718

if(S_ISREG(st.st_mode)

1719

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

1503

1720

ret = fchown(pubkey_fd, uid, gid);

1504

1721

if(ret == -1){

1505

1722

perror_plus("fchown");

1518

1735

}

1519

1736

}

1520

1737

1738

/* Run network hooks */

1739

{

1740

if(getuid() == 0){

1741

/* Re-raise priviliges */

1742

errno = 0;

1743

ret = seteuid(0);

1744

if(ret == -1){

1745

perror_plus("seteuid");

1746

}

1747

}

1748

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

1749

goto end;

1750

}

1751

if(getuid() == 0){

1752

/* Lower privileges */

1753

errno = 0;

1754

ret = seteuid(uid);

1755

if(ret == -1){

1756

perror_plus("seteuid");

1757

}

1758

}

1759

}

1760

1521

1761

if(not debug){

1522

1762

avahi_set_log_function(empty_log);

1523

1763

}

1524

1764

1525

1765

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

1526

1766

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1767

/* First look for interfaces that are up */

1768

ret = scandir(sys_class_net, &direntries, up_interface,

1528

1769

alphasort);

1770

if(ret == 0){

1771

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

1772

free(direntries);

1773

ret = scandir(sys_class_net, &direntries, good_interface,

1774

alphasort);

1775

}

1529

1776

if(ret >= 1){

1530

/* Pick the first good interface */

1777

/* Pick the first interface returned */

1531

1778

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

1532

1779

if(debug){

1533

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

1780

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

1534

1781

}

1535

1782

if(interface == NULL){

1536

1783

perror_plus("malloc");

1541

1788

free(direntries);

1542

1789

} else {

1543

1790

free(direntries);

1544

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

1791

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

1545

1792

exitcode = EXIT_FAILURE;

1546

1793

goto end;

1547

1794

}

1553

1800

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

1554

1801

mc.simple_poll = avahi_simple_poll_new();

1555

1802

if(mc.simple_poll == NULL){

1556

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

1803

fprintf_plus(stderr,

1804

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

1557

1805

exitcode = EX_UNAVAILABLE;

1558

1806

goto end;

1559

1807

}

1625

1873

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

1626

1874

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

1875

if(if_index == 0){

1628

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

1876

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

1629

1877

exitcode = EX_UNAVAILABLE;

1630

1878

goto end;

1631

1879

}

1751

1999

#endif /* __linux__ */

1752

2000

/* Lower privileges */

1753

2001

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

1760

} else {

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

2002

/* Lower privileges */

2003

ret = seteuid(uid);

2004

if(ret == -1){

2005

perror_plus("seteuid");

1766

2006

}

1767

2007

}

1768

2008

1772

2012

1773

2013

ret = init_gnutls_global(pubkey, seckey);

1774

2014

if(ret == -1){

1775

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

2015

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

1776

2016

exitcode = EX_UNAVAILABLE;

1777

2017

goto end;

1778

2018

} else {

1794

2034

}

1795

2035

1796

2036

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

1797

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

2037

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

1798

2038

exitcode = EX_UNAVAILABLE;

1799

2039

goto end;

1800

2040

} else {

1810

2050

/* (Mainly meant for debugging) */

1811

2051

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

1812

2052

if(address == NULL){

1813

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

2053

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

1814

2054

exitcode = EX_USAGE;

1815

2055

goto end;

1816

2056

}

1824

2064

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

1825

2065

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

1826

2066

or tmpmax != (uint16_t)tmpmax){

1827

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

2067

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

1828

2068

exitcode = EX_USAGE;

1829

2069

goto end;

1830

2070

}

1860

2100

break;

1861

2101

}

1862

2102

if(debug){

1863

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

1864

(int)retry_interval);

2103

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

2104

(int)retry_interval);

1865

2105

}

1866

2106

sleep((int)retry_interval);

1867

2107

}

1869

2109

if (not quit_now){

1870

2110

exitcode = EXIT_SUCCESS;

1871

2111

}

1872

2112

1873

2113

goto end;

1874

2114

}

1875

2115

1897

2137

1898

2138

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

1899

2139

if(mc.server == NULL){

1900

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

1901

avahi_strerror(error));

2140

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

2141

avahi_strerror(error));

1902

2142

exitcode = EX_UNAVAILABLE;

1903

2143

goto end;

1904

2144

}

1912

2152

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1913

2153

NULL, 0, browse_callback, NULL);

1914

2154

if(sb == NULL){

1915

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

1916

avahi_strerror(avahi_server_errno(mc.server)));

2155

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

2156

avahi_strerror(avahi_server_errno(mc.server)));

1917

2157

exitcode = EX_UNAVAILABLE;

1918

2158

goto end;

1919

2159

}

1925

2165

/* Run the main loop */

1926

2166

1927

2167

if(debug){

1928

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

2168

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

1929

2169

}

1930

2170

1931

2171

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

2172

(int)(retry_interval * 1000));

1933

2173

if(debug){

1934

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

1935

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

2174

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

2175

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

1936

2176

}

1937

2177

1938

2178

end:

1939

2179

1940

2180

if(debug){

1941

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

2181

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

1942

2182

}

1943

2183

1944

2184

/* Cleanup things */

1972

2212

}

1973

2213

}

1974

2214

1975

/* Take down the network interface */

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

if(geteuid() == 0){

2215

/* Re-raise priviliges */

2216

{

2217

if(getuid() == 0){

2218

errno = 0;

2219

ret = seteuid(0);

2220

if(ret == -1){

2221

perror_plus("seteuid");

2222

}

2223

}

2224

/* Run network hooks */

2225

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

2226

goto end;

2227

}

2228

2229

/* Take down the network interface */

2230

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

1984

2231

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

1985

2232

if(ret == -1){

1986

2233

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

2234

} else if(network.ifr_flags & IFF_UP){

1988

2235

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

1989

2236

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

1990

2237

if(ret == -1){

1995

2242

if(ret == -1){

1996

2243

perror_plus("close");

1997

2244

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

2245

}

2246

}

2247

if(getuid() == 0){

2248

/* Lower privileges permanently */

2249

errno = 0;

2250

ret = setuid(uid);

2251

if(ret == -1){

2252

perror_plus("setuid");

2004

2253

}

2005

2254

}

2006

2255

2022

2271

}

2023

2272

ret = remove(fullname);

2024

2273

if(ret == -1){

2025

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

2026

strerror(errno));

2274

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

2275

strerror(errno));

2027

2276

}

2028

2277

free(fullname);

2029

2278

}