/mandos/release : revision 237.16.23

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

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() */

90

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

88

91

89

92

#ifdef __linux__

90

93

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

108

111

init_gnutls_session(),

109

112

GNUTLS_* */

110

113

#include <gnutls/openpgp.h>

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

113

116

114

117

/* GPGME */

115

118

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

131

134

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

132

135

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

133

136

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

134

138

135

139

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

136

140

typedef struct server{

171

175

perror(print_text);

172

176

}

173

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

174

187

/*

175

188

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

176

189

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

177

190

* "buffer_length" is how much is already used.

178

191

*/

179

192

size_t incbuffer(char **buffer, size_t buffer_length,

180

size_t buffer_capacity){

193

size_t buffer_capacity){

181

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

182

195

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

183

196

if(buffer == NULL){

189

202

}

190

203

191

204

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

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

205

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

206

int af){

195

207

int ret;

196

208

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

197

209

if(new_server == NULL){

199

211

return -1;

200

212

}

201

213

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

202

.port = port,

203

.if_index = if_index,

204

.af = af };

214

.port = port,

215

.if_index = if_index,

216

.af = af };

205

217

if(new_server->ip == NULL){

206

218

perror_plus("strdup");

207

219

return -1;

229

241

/*

230

242

* Initialize GPGME.

231

243

*/

232

static bool init_gpgme(const char *seckey,

233

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

234

246

gpgme_error_t rc;

235

247

gpgme_engine_info_t engine_info;

236

248

251

263

252

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

253

265

if(rc != GPG_ERR_NO_ERROR){

254

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

255

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));

256

268

return false;

257

269

}

258

270

259

271

rc = gpgme_op_import(mc.ctx, pgp_data);

260

272

if(rc != GPG_ERR_NO_ERROR){

261

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

262

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

263

275

return false;

264

276

}

265

277

272

284

}

273

285

274

286

if(debug){

275

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

287

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

276

288

}

277

289

278

290

/* Init GPGME */

279

291

gpgme_check_version(NULL);

280

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

281

293

if(rc != GPG_ERR_NO_ERROR){

282

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

283

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));

284

296

return false;

285

297

}

286

298

287

299

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

288

300

rc = gpgme_get_engine_info(&engine_info);

289

301

if(rc != GPG_ERR_NO_ERROR){

290

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

291

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));

292

304

return false;

293

305

}

294

306

while(engine_info != NULL){

300

312

engine_info = engine_info->next;

301

313

}

302

314

if(engine_info == NULL){

303

fprintf(stderr, "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);

304

317

return false;

305

318

}

306

319

307

320

/* Create new GPGME "context" */

308

321

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

309

322

if(rc != GPG_ERR_NO_ERROR){

310

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

311

gpgme_strsource(rc), 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));

312

326

return false;

313

327

}

314

328

333

347

ssize_t plaintext_length = 0;

334

348

335

349

if(debug){

336

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

350

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

337

351

}

338

352

339

353

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

340

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

341

355

0);

342

356

if(rc != GPG_ERR_NO_ERROR){

343

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

344

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));

345

359

return -1;

346

360

}

347

361

348

362

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

349

363

rc = gpgme_data_new(&dh_plain);

350

364

if(rc != GPG_ERR_NO_ERROR){

351

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

352

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));

353

368

gpgme_data_release(dh_crypto);

354

369

return -1;

355

370

}

358

373

data buffer */

359

374

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

360

375

if(rc != GPG_ERR_NO_ERROR){

361

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

362

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

363

378

plaintext_length = -1;

364

379

if(debug){

365

380

gpgme_decrypt_result_t result;

366

381

result = gpgme_op_decrypt_result(mc.ctx);

367

382

if(result == NULL){

368

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

383

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

369

384

} else {

370

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

371

result->unsupported_algorithm);

372

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

373

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);

374

389

if(result->file_name != NULL){

375

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

390

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

376

391

}

377

392

gpgme_recipient_t recipient;

378

393

recipient = result->recipients;

379

394

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "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");

386

402

recipient = recipient->next;

387

403

}

388

404

}

391

407

}

392

408

393

409

if(debug){

394

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

410

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

395

411

}

396

412

397

413

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

404

420

*plaintext = NULL;

405

421

while(true){

406

422

plaintext_capacity = incbuffer(plaintext,

407

(size_t)plaintext_length,

408

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

409

425

if(plaintext_capacity == 0){

410

perror_plus("incbuffer");

411

plaintext_length = -1;

412

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

413

429

}

414

430

415

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

428

444

}

429

445

430

446

if(debug){

431

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

447

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

432

448

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

433

449

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

434

450

}

456

472

/* GnuTLS log function callback */

457

473

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

458

474

const char* string){

459

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

475

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

460

476

}

461

477

462

478

static int init_gnutls_global(const char *pubkeyfilename,

464

480

int ret;

465

481

466

482

if(debug){

467

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

483

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

468

484

}

469

485

470

486

ret = gnutls_global_init();

471

487

if(ret != GNUTLS_E_SUCCESS){

472

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

473

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

474

490

return -1;

475

491

}

476

492

485

501

/* OpenPGP credentials */

486

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

487

503

if(ret != GNUTLS_E_SUCCESS){

488

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

489

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

490

506

gnutls_global_deinit();

491

507

return -1;

492

508

}

493

509

494

510

if(debug){

495

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

496

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

497

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);

498

515

}

499

516

500

517

ret = gnutls_certificate_set_openpgp_key_file

501

518

(mc.cred, pubkeyfilename, seckeyfilename,

502

519

GNUTLS_OPENPGP_FMT_BASE64);

503

520

if(ret != GNUTLS_E_SUCCESS){

504

fprintf(stderr,

505

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

506

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

507

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

508

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));

509

526

goto globalfail;

510

527

}

511

528

512

529

/* GnuTLS server initialization */

513

530

ret = gnutls_dh_params_init(&mc.dh_params);

514

531

if(ret != GNUTLS_E_SUCCESS){

515

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

516

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

517

535

goto globalfail;

518

536

}

519

537

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

520

538

if(ret != GNUTLS_E_SUCCESS){

521

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

522

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

523

541

goto globalfail;

524

542

}

525

543

545

563

}

546

564

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

547

565

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

550

569

}

551

570

552

571

{

559

578

}

560

579

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

561

580

if(ret != GNUTLS_E_SUCCESS){

562

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

563

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

564

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));

565

584

gnutls_deinit(*session);

566

585

return -1;

567

586

}

576

595

}

577

596

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

578

597

if(ret != GNUTLS_E_SUCCESS){

579

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

580

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

581

600

gnutls_deinit(*session);

582

601

return -1;

583

602

}

628

647

pf = PF_INET;

629

648

break;

630

649

default:

631

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

650

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

632

651

errno = EINVAL;

633

652

return -1;

634

653

}

639

658

}

640

659

641

660

if(debug){

642

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

643

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

644

663

}

645

664

646

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

672

691

}

673

692

if(ret == 0){

674

693

int e = errno;

675

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

694

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

676

695

errno = e;

677

696

goto mandos_end;

678

697

}

683

702

684

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

685

704

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

686

-Wunreachable-code*/

705

-Wunreachable-code*/

687

706

if(if_index == AVAHI_IF_UNSPEC){

688

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

689

" without a network interface\n");

707

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

708

" incomplete without a network interface\n");

690

709

errno = EINVAL;

691

710

goto mandos_end;

692

711

}

710

729

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

711

730

perror_plus("if_indextoname");

712

731

} else {

713

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

714

ip, interface, port);

732

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

733

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

715

734

}

716

735

} else {

717

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

718

port);

736

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

737

ip, port);

719

738

}

720

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

721

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

731

750

perror_plus("inet_ntop");

732

751

} else {

733

752

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

734

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

753

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

735

754

}

736

755

}

737

756

}

765

784

while(true){

766

785

size_t out_size = strlen(out);

767

786

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

768

out_size - written));

787

out_size - written));

769

788

if(ret == -1){

770

789

int e = errno;

771

790

perror_plus("write");

791

810

}

792

811

793

812

if(debug){

794

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

813

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

795

814

}

796

815

797

816

if(quit_now){

817

836

818

837

if(ret != GNUTLS_E_SUCCESS){

819

838

if(debug){

820

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

839

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

821

840

gnutls_perror(ret);

822

841

}

823

842

errno = EPROTO;

827

846

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

828

847

829

848

if(debug){

830

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

831

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

832

851

}

833

852

834

853

while(true){

839

858

}

840

859

841

860

buffer_capacity = incbuffer(&buffer, buffer_length,

842

buffer_capacity);

861

buffer_capacity);

843

862

if(buffer_capacity == 0){

844

863

int e = errno;

845

864

perror_plus("incbuffer");

872

891

}

873

892

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

874

893

if(ret < 0){

875

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

894

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

895

"***\n");

876

896

gnutls_perror(ret);

877

897

errno = EPROTO;

878

898

goto mandos_end;

879

899

}

880

900

break;

881

901

default:

882

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

883

" encrypted session with Mandos server\n");

902

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

903

" encrypted session with Mandos server\n");

884

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

905

errno = EIO;

886

906

goto mandos_end;

891

911

}

892

912

893

913

if(debug){

894

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

914

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

895

915

}

896

916

897

917

if(quit_now){

909

929

910

930

if(buffer_length > 0){

911

931

ssize_t decrypted_buffer_size;

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

913

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

914

933

&decrypted_buffer);

915

934

if(decrypted_buffer_size >= 0){

916

935

927

946

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

928

947

int e = errno;

929

948

if(debug){

930

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

931

strerror(errno));

949

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

950

strerror(errno));

932

951

}

933

952

errno = e;

934

953

goto mandos_end;

991

1010

switch(event){

992

1011

default:

993

1012

case AVAHI_RESOLVER_FAILURE:

994

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

995

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

996

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)));

997

1017

break;

998

1018

999

1019

case AVAHI_RESOLVER_FOUND:

1001

1021

char ip[AVAHI_ADDRESS_STR_MAX];

1002

1022

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

1003

1023

if(debug){

1004

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

1005

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

1006

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);

1007

1027

}

1008

1028

int ret = start_mandos_communication(ip, port, interface,

1009

1029

avahi_proto_to_af(proto));

1041

1061

default:

1042

1062

case AVAHI_BROWSER_FAILURE:

1043

1063

1044

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

1045

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1046

1066

avahi_simple_poll_quit(mc.simple_poll);

1047

1067

return;

1048

1068

1055

1075

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

1056

1076

name, type, domain, protocol, 0,

1057

1077

resolve_callback, NULL) == NULL)

1058

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

1059

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)));

1060

1081

break;

1061

1082

1062

1083

case AVAHI_BROWSER_REMOVE:

1065

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

1066

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1067

1088

if(debug){

1068

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

1089

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

1090

" searching...\n");

1069

1091

}

1070

1092

break;

1071

1093

}

1110

1132

/* Reject the loopback device */

1111

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

1134

if(debug){

1113

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

1114

ifname);

1135

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

1136

ifname);

1115

1137

}

1116

1138

return false;

1117

1139

}

1118

1140

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

1119

1141

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

1120

1142

if(debug){

1121

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

1122

ifname);

1143

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

1144

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

1123

1145

}

1124

1146

return true;

1125

1147

}

1126

1148

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

1127

1149

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

1128

1150

if(debug){

1129

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

1130

ifname);

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1131

1153

}

1132

1154

return false;

1133

1155

}

1134

1156

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

1135

1157

if(ifr->ifr_flags & IFF_NOARP){

1136

1158

if(debug){

1137

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

1159

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

1160

ifname);

1138

1161

}

1139

1162

return false;

1140

1163

}

1141

1164

1142

1165

/* Accept this device */

1143

1166

if(debug){

1144

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

1167

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

1145

1168

}

1146

1169

return true;

1147

1170

}

1159

1182

struct ifreq ifr;

1160

1183

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

1161

1184

if(debug){

1162

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

1163

if_entry->d_name);

1185

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

1186

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

1164

1187

}

1165

1188

return 0;

1166

1189

}

1184

1207

struct ifreq ifr;

1185

1208

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

1186

1209

if(debug){

1187

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

1188

if_entry->d_name);

1210

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

1211

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

1189

1212

}

1190

1213

return 0;

1191

1214

}

1193

1216

/* Reject down interfaces */

1194

1217

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

1195

1218

if(debug){

1196

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

1197

if_entry->d_name);

1219

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

1220

if_entry->d_name);

1198

1221

}

1199

1222

return 0;

1200

1223

}

1202

1225

/* Reject non-running interfaces */

1203

1226

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

1204

1227

if(debug){

1205

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

1206

if_entry->d_name);

1228

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

1229

if_entry->d_name);

1207

1230

}

1208

1231

return 0;

1209

1232

}

1228

1251

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

1229

1252

int runnable_hook(const struct dirent *direntry){

1230

1253

int ret;

1254

size_t sret;

1231

1255

struct stat st;

1232

1256

1233

1257

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

1235

1259

return 0;

1236

1260

}

1237

1261

1238

/* Save pointer to last character */

1239

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

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

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

1247

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

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

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

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

}

1274

1275

char *fullname = NULL;

1276

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

1277

if(ret < 0){

1278

perror_plus("asprintf");

1279

return 0;

1280

}

1281

1282

ret = stat(fullname, &st);

1255

1283

if(ret == -1){

1256

1284

if(debug){

1257

perror_plus("Could not stat plugin");

1285

perror_plus("Could not stat hook");

1258

1286

}

1259

1287

return 0;

1260

1288

}

1261

1289

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

1262

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1263

1295

return 0;

1264

1296

}

1265

1297

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

1266

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1267

1303

return 0;

1268

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1269

1309

return 1;

1270

1310

}

1271

1311

1278

1318

while(true){

1279

1319

if(mc.current_server == NULL){

1280

1320

if (debug){

1281

fprintf(stderr,

1282

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

1321

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

1322

" No timeout!\n");

1283

1323

}

1284

1324

ret = avahi_simple_poll_iterate(s, -1);

1285

1325

} else {

1286

1326

if (debug){

1287

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

1288

" or wait\n");

1327

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

1328

" it, or wait\n");

1289

1329

}

1290

1330

/* the current time */

1291

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1307

1347

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

1308

1348

1309

1349

if (debug){

1310

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

1350

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

1351

block_time);

1311

1352

}

1312

1353

1313

1354

if(block_time <= 0){

1333

1374

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

1334

1375

}

1335

1376

if(ret != 0){

1336

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

1377

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

1337

1378

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

1338

1379

}

1339

1380

}

1340

1381

}

1341

1382

}

1342

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

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

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

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

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

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

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

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

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

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

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

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1469

free(delaystring);

1470

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

1471

perror_plus("execl");

1472

} else {

1473

int status;

1474

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

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

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

1482

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

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

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

1489

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

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

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

1495

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

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

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

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1509

}

1510

1343

1511

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

1344

1512

AvahiSServiceBrowser *sb = NULL;

1345

1513

int error;

1427

1595

.arg = "SECONDS",

1428

1596

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

1429

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1430

1602

/*

1431

1603

* These reproduce what we would get without ARGP_NO_HELP

1432

1604

*/

1485

1657

argp_error(state, "Bad retry interval");

1486

1658

}

1487

1659

break;

1660

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

1661

hookdir = arg;

1662

break;

1488

1663

/*

1489

1664

* These reproduce what we would get without ARGP_NO_HELP

1490

1665

*/

1496

1671

argp_state_help(state, state->out_stream,

1497

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

1673

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

1499

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

1676

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

1500

1677

exit(argp_err_exit_status);

1501

1678

break;

1502

1679

default:

1529

1706

{

1530

1707

/* Work around Debian bug #633582:

1531

1708

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

1532

struct stat st;

1533

1709

1534

1710

/* Re-raise priviliges */

1535

1711

errno = 0;

1536

1712

ret = seteuid(0);

1537

1713

if(ret == -1){

1538

1714

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1715

} else {

1716

struct stat st;

1717

1718

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

1719

int seckey_fd = open(seckey, O_RDONLY);

1720

if(seckey_fd == -1){

1721

perror_plus("open");

1722

} else {

1723

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

1724

if(ret == -1){

1725

perror_plus("fstat");

1726

} else {

1727

if(S_ISREG(st.st_mode)

1728

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

1729

ret = fchown(seckey_fd, uid, gid);

1730

if(ret == -1){

1731

perror_plus("fchown");

1732

}

1733

}

1734

}

1735

TEMP_FAILURE_RETRY(close(seckey_fd));

1736

}

1737

}

1738

1739

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

1740

int pubkey_fd = open(pubkey, O_RDONLY);

1741

if(pubkey_fd == -1){

1742

perror_plus("open");

1743

} else {

1744

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

1745

if(ret == -1){

1746

perror_plus("fstat");

1747

} else {

1748

if(S_ISREG(st.st_mode)

1749

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

1750

ret = fchown(pubkey_fd, uid, gid);

1751

if(ret == -1){

1752

perror_plus("fchown");

1753

}

1754

}

1755

}

1756

TEMP_FAILURE_RETRY(close(pubkey_fd));

1757

}

1758

}

1759

1760

/* Lower privileges */

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

1765

}

1586

1766

}

1587

1767

}

1588

1768

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

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

1594

alphasort);

1595

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

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

setenv("DEVICE", interface, 1);

1612

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

1613

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

1614

/* setenv( XXX more here */

1615

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

1616

perror_plus("execl");

1617

}

1618

free(fullname);

1619

if(quit_now){

1620

goto end;

1621

}

1622

}

1623

close(devnull);

1769

/* Run network hooks */

1770

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

1771

goto end;

1624

1772

}

1625

1773

1626

1774

if(not debug){

1642

1790

/* Pick the first interface returned */

1643

1791

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

1644

1792

if(debug){

1645

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

1793

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

1646

1794

}

1647

1795

if(interface == NULL){

1648

1796

perror_plus("malloc");

1653

1801

free(direntries);

1654

1802

} else {

1655

1803

free(direntries);

1656

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

1804

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

1657

1805

exitcode = EXIT_FAILURE;

1658

1806

goto end;

1659

1807

}

1665

1813

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

1666

1814

mc.simple_poll = avahi_simple_poll_new();

1667

1815

if(mc.simple_poll == NULL){

1668

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

1816

fprintf_plus(stderr,

1817

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

1669

1818

exitcode = EX_UNAVAILABLE;

1670

1819

goto end;

1671

1820

}

1737

1886

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

1738

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1739

1888

if(if_index == 0){

1740

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

1889

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

1741

1890

exitcode = EX_UNAVAILABLE;

1742

1891

goto end;

1743

1892

}

1863

2012

#endif /* __linux__ */

1864

2013

/* Lower privileges */

1865

2014

errno = 0;

1866

if(take_down_interface){

1867

/* Lower privileges */

1868

ret = seteuid(uid);

1869

if(ret == -1){

1870

perror_plus("seteuid");

1871

}

1872

} else {

1873

/* Lower privileges permanently */

1874

ret = setuid(uid);

1875

if(ret == -1){

1876

perror_plus("setuid");

1877

}

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

1878

2019

}

1879

2020

}

1880

2021

1884

2025

1885

2026

ret = init_gnutls_global(pubkey, seckey);

1886

2027

if(ret == -1){

1887

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

2028

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

1888

2029

exitcode = EX_UNAVAILABLE;

1889

2030

goto end;

1890

2031

} else {

1906

2047

}

1907

2048

1908

2049

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

1909

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

2050

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

1910

2051

exitcode = EX_UNAVAILABLE;

1911

2052

goto end;

1912

2053

} else {

1922

2063

/* (Mainly meant for debugging) */

1923

2064

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

1924

2065

if(address == NULL){

1925

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

2066

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

1926

2067

exitcode = EX_USAGE;

1927

2068

goto end;

1928

2069

}

1936

2077

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

1937

2078

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

1938

2079

or tmpmax != (uint16_t)tmpmax){

1939

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

2080

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

1940

2081

exitcode = EX_USAGE;

1941

2082

goto end;

1942

2083

}

1972

2113

break;

1973

2114

}

1974

2115

if(debug){

1975

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

1976

(int)retry_interval);

2116

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

2117

(int)retry_interval);

1977

2118

}

1978

2119

sleep((int)retry_interval);

1979

2120

}

2009

2150

2010

2151

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

2011

2152

if(mc.server == NULL){

2012

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

2013

avahi_strerror(error));

2153

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

2154

avahi_strerror(error));

2014

2155

exitcode = EX_UNAVAILABLE;

2015

2156

goto end;

2016

2157

}

2024

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2025

2166

NULL, 0, browse_callback, NULL);

2026

2167

if(sb == NULL){

2027

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

2028

avahi_strerror(avahi_server_errno(mc.server)));

2168

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

2169

avahi_strerror(avahi_server_errno(mc.server)));

2029

2170

exitcode = EX_UNAVAILABLE;

2030

2171

goto end;

2031

2172

}

2037

2178

/* Run the main loop */

2038

2179

2039

2180

if(debug){

2040

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

2181

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

2041

2182

}

2042

2183

2043

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2044

2185

(int)(retry_interval * 1000));

2045

2186

if(debug){

2046

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

2047

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

2187

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

2188

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

2048

2189

}

2049

2190

2050

2191

end:

2051

2192

2052

2193

if(debug){

2053

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

2194

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

2054

2195

}

2055

2196

2056

2197

/* Cleanup things */

2072

2213

if(gpgme_initialized){

2073

2214

gpgme_release(mc.ctx);

2074

2215

}

2075

2216

2076

2217

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

2077

2218

has seen */

2078

2219

if(mc.current_server != NULL){

2084

2225

}

2085

2226

}

2086

2227

2087

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

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2088

2230

2089

/* Take down the network interface */

2090

if(take_down_interface){

2091

/* Re-raise priviliges */

2231

/* Re-raise priviliges */

2232

{

2092

2233

errno = 0;

2093

2234

ret = seteuid(0);

2094

2235

if(ret == -1){

2095

2236

perror_plus("seteuid");

2096

2237

}

2097

if(geteuid() == 0){

2238

2239

/* Take down the network interface */

2240

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

2098

2241

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

2099

2242

if(ret == -1){

2100

2243

perror_plus("ioctl SIOCGIFFLAGS");

2101

} else if(network.ifr_flags & IFF_UP) {

2244

} else if(network.ifr_flags & IFF_UP){

2102

2245

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

2103

2246

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

2104

2247

if(ret == -1){

2109

2252

if(ret == -1){

2110

2253

perror_plus("close");

2111

2254

}

2112

/* Lower privileges permanently */

2113

errno = 0;

2114

ret = setuid(uid);

2115

if(ret == -1){

2116

perror_plus("setuid");

2117

}

2118

2255

}

2119

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2120

2263

2121

2264

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

2122

2265

if(tempdir_created){

2136

2279

}

2137

2280

ret = remove(fullname);

2138

2281

if(ret == -1){

2139

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

2140

strerror(errno));

2282

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

2283

strerror(errno));

2141

2284

}

2142

2285

free(fullname);

2143

2286

}