/mandos/trunk : revision 505.2.4

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

73

*/

74

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

75

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

76

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

76

setgid(), pause() */

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() */

91

88

92

89

#ifdef __linux__

93

90

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

111

108

init_gnutls_session(),

112

109

GNUTLS_* */

113

110

#include <gnutls/openpgp.h>

114

/* gnutls_certificate_set_openpgp_key_file(),

115

GNUTLS_OPENPGP_FMT_BASE64 */

111

/* gnutls_certificate_set_openpgp_key_file(),

112

GNUTLS_OPENPGP_FMT_BASE64 */

116

113

117

114

/* GPGME */

118

115

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

134

131

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

135

132

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

136

133

char *connect_to = NULL;

137

const char *hookdir = HOOKDIR;

138

134

139

135

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

140

136

typedef struct server{

170

166

171

167

/* Function to use when printing errors */

172

168

void perror_plus(const char *print_text){

173

int e = errno;

174

169

fprintf(stderr, "Mandos plugin %s: ",

175

170

program_invocation_short_name);

176

errno = e;

177

171

perror(print_text);

178

172

}

179

173

180

__attribute__((format (gnu_printf, 2, 3)))

181

174

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

182

175

va_list ap;

183

176

va_start (ap, format);

184

177

185

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

186

program_invocation_short_name));

178

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

187

179

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

188

180

}

189

181

193

185

* "buffer_length" is how much is already used.

194

186

*/

195

187

size_t incbuffer(char **buffer, size_t buffer_length,

196

size_t buffer_capacity){

188

size_t buffer_capacity){

197

189

if(buffer_length + BUFFER_SIZE > buffer_capacity){

198

190

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

199

191

if(buffer == NULL){

205

197

}

206

198

207

199

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

208

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

209

int af){

200

int add_server(const char *ip, uint16_t port,

201

AvahiIfIndex if_index,

202

int af){

210

203

int ret;

211

204

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

212

205

if(new_server == NULL){

213

206

perror_plus("malloc");

214

return false;

207

return -1;

215

208

}

216

209

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

217

.port = port,

218

.if_index = if_index,

219

.af = af };

210

.port = port,

211

.if_index = if_index,

212

.af = af };

220

213

if(new_server->ip == NULL){

221

214

perror_plus("strdup");

222

return false;

215

return -1;

223

216

}

224

217

/* Special case of first server */

225

218

if (mc.current_server == NULL){

236

229

ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

237

230

if(ret == -1){

238

231

perror_plus("clock_gettime");

239

return false;

232

return -1;

240

233

}

241

return true;

234

return 0;

242

235

}

243

236

244

237

/*

245

238

* Initialize GPGME.

246

239

*/

247

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

248

const char *tempdir){

240

static bool init_gpgme(const char *seckey,

241

const char *pubkey, const char *tempdir){

249

242

gpgme_error_t rc;

250

243

gpgme_engine_info_t engine_info;

251

244

266

259

267

260

rc = gpgme_data_new_from_fd(&pgp_data, fd);

268

261

if(rc != GPG_ERR_NO_ERROR){

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

262

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

263

gpgme_strsource(rc), gpgme_strerror(rc));

271

264

return false;

272

265

}

273

266

274

267

rc = gpgme_op_import(mc.ctx, pgp_data);

275

268

if(rc != GPG_ERR_NO_ERROR){

276

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

277

gpgme_strsource(rc), gpgme_strerror(rc));

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

278

271

return false;

279

272

}

280

273

287

280

}

288

281

289

282

if(debug){

290

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

283

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

291

284

}

292

285

293

286

/* Init GPGME */

294

287

gpgme_check_version(NULL);

295

288

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

296

289

if(rc != GPG_ERR_NO_ERROR){

297

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

298

gpgme_strsource(rc), gpgme_strerror(rc));

290

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

291

gpgme_strsource(rc), gpgme_strerror(rc));

299

292

return false;

300

293

}

301

294

302

295

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

303

296

rc = gpgme_get_engine_info(&engine_info);

304

297

if(rc != GPG_ERR_NO_ERROR){

305

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

306

gpgme_strsource(rc), gpgme_strerror(rc));

298

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

299

gpgme_strsource(rc), gpgme_strerror(rc));

307

300

return false;

308

301

}

309

302

while(engine_info != NULL){

315

308

engine_info = engine_info->next;

316

309

}

317

310

if(engine_info == NULL){

318

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

319

tempdir);

311

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

320

312

return false;

321

313

}

322

314

323

315

/* Create new GPGME "context" */

324

316

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

325

317

if(rc != GPG_ERR_NO_ERROR){

326

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

327

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

328

gpgme_strerror(rc));

318

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

319

gpgme_strsource(rc), gpgme_strerror(rc));

329

320

return false;

330

321

}

331

322

350

341

ssize_t plaintext_length = 0;

351

342

352

343

if(debug){

353

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

344

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

354

345

}

355

346

356

347

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

357

348

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

358

349

0);

359

350

if(rc != GPG_ERR_NO_ERROR){

360

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

361

gpgme_strsource(rc), gpgme_strerror(rc));

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

362

353

return -1;

363

354

}

364

355

365

356

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

366

357

rc = gpgme_data_new(&dh_plain);

367

358

if(rc != GPG_ERR_NO_ERROR){

368

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

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

371

361

gpgme_data_release(dh_crypto);

372

362

return -1;

373

363

}

376

366

data buffer */

377

367

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

378

368

if(rc != GPG_ERR_NO_ERROR){

379

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

380

gpgme_strsource(rc), gpgme_strerror(rc));

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

381

371

plaintext_length = -1;

382

372

if(debug){

383

373

gpgme_decrypt_result_t result;

384

374

result = gpgme_op_decrypt_result(mc.ctx);

385

375

if(result == NULL){

386

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

376

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

387

377

} else {

388

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

389

result->unsupported_algorithm);

390

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

391

result->wrong_key_usage);

378

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

379

result->unsupported_algorithm);

380

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

381

result->wrong_key_usage);

392

382

if(result->file_name != NULL){

393

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

383

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

394

384

}

395

385

gpgme_recipient_t recipient;

396

386

recipient = result->recipients;

397

387

while(recipient != NULL){

398

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

399

gpgme_pubkey_algo_name

400

(recipient->pubkey_algo));

401

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

402

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

403

recipient->status == GPG_ERR_NO_SECKEY

404

? "No" : "Yes");

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");

405

394

recipient = recipient->next;

406

395

}

407

396

}

410

399

}

411

400

412

401

if(debug){

413

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

402

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

414

403

}

415

404

416

405

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

423

412

*plaintext = NULL;

424

413

while(true){

425

414

plaintext_capacity = incbuffer(plaintext,

426

(size_t)plaintext_length,

427

plaintext_capacity);

415

(size_t)plaintext_length,

416

plaintext_capacity);

428

417

if(plaintext_capacity == 0){

429

perror_plus("incbuffer");

430

plaintext_length = -1;

431

goto decrypt_end;

418

perror_plus("incbuffer");

419

plaintext_length = -1;

420

goto decrypt_end;

432

421

}

433

422

434

423

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

447

436

}

448

437

449

438

if(debug){

450

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

439

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

451

440

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

452

441

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

453

442

}

475

464

/* GnuTLS log function callback */

476

465

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

477

466

const char* string){

478

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

467

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

479

468

}

480

469

481

470

static int init_gnutls_global(const char *pubkeyfilename,

483

472

int ret;

484

473

485

474

if(debug){

486

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

475

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

487

476

}

488

477

489

478

ret = gnutls_global_init();

490

479

if(ret != GNUTLS_E_SUCCESS){

491

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

492

safer_gnutls_strerror(ret));

480

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

481

safer_gnutls_strerror(ret));

493

482

return -1;

494

483

}

495

484

504

493

/* OpenPGP credentials */

505

494

ret = gnutls_certificate_allocate_credentials(&mc.cred);

506

495

if(ret != GNUTLS_E_SUCCESS){

507

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

508

safer_gnutls_strerror(ret));

496

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

497

safer_gnutls_strerror(ret));

509

498

gnutls_global_deinit();

510

499

return -1;

511

500

}

512

501

513

502

if(debug){

514

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

515

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

516

pubkeyfilename,

517

seckeyfilename);

503

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

504

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

505

seckeyfilename);

518

506

}

519

507

520

508

ret = gnutls_certificate_set_openpgp_key_file

521

509

(mc.cred, pubkeyfilename, seckeyfilename,

522

510

GNUTLS_OPENPGP_FMT_BASE64);

523

511

if(ret != GNUTLS_E_SUCCESS){

524

fprintf_plus(stderr,

525

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

526

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

527

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

528

safer_gnutls_strerror(ret));

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));

529

517

goto globalfail;

530

518

}

531

519

532

520

/* GnuTLS server initialization */

533

521

ret = gnutls_dh_params_init(&mc.dh_params);

534

522

if(ret != GNUTLS_E_SUCCESS){

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

536

" initialization: %s\n",

537

safer_gnutls_strerror(ret));

523

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

524

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

538

525

goto globalfail;

539

526

}

540

527

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

541

528

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

529

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

530

safer_gnutls_strerror(ret));

544

531

goto globalfail;

545

532

}

546

533

566

553

}

567

554

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

568

555

if(ret != GNUTLS_E_SUCCESS){

569

fprintf_plus(stderr,

570

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

571

safer_gnutls_strerror(ret));

556

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

557

safer_gnutls_strerror(ret));

572

558

}

573

559

574

560

{

581

567

}

582

568

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

583

569

if(ret != GNUTLS_E_SUCCESS){

584

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

585

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

586

safer_gnutls_strerror(ret));

570

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

571

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

572

safer_gnutls_strerror(ret));

587

573

gnutls_deinit(*session);

588

574

return -1;

589

575

}

598

584

}

599

585

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

600

586

if(ret != GNUTLS_E_SUCCESS){

601

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

602

safer_gnutls_strerror(ret));

587

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

588

safer_gnutls_strerror(ret));

603

589

gnutls_deinit(*session);

604

590

return -1;

605

591

}

650

636

pf = PF_INET;

651

637

break;

652

638

default:

653

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

639

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

654

640

errno = EINVAL;

655

641

return -1;

656

642

}

661

647

}

662

648

663

649

if(debug){

664

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

665

PRIu16 "\n", ip, port);

650

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

651

"\n", ip, port);

666

652

}

667

653

668

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

694

680

}

695

681

if(ret == 0){

696

682

int e = errno;

697

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

683

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

698

684

errno = e;

699

685

goto mandos_end;

700

686

}

705

691

706

692

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

693

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

708

-Wunreachable-code*/

694

-Wunreachable-code*/

709

695

if(if_index == AVAHI_IF_UNSPEC){

710

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

711

" incomplete without a network interface\n");

696

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

697

" without a network interface\n");

712

698

errno = EINVAL;

713

699

goto mandos_end;

714

700

}

732

718

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

733

719

perror_plus("if_indextoname");

734

720

} else {

735

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

736

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

721

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

722

ip, interface, port);

737

723

}

738

724

} else {

739

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

740

ip, port);

725

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

726

port);

741

727

}

742

728

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

743

729

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

753

739

perror_plus("inet_ntop");

754

740

} else {

755

741

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

756

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

742

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

757

743

}

758

744

}

759

745

}

787

773

while(true){

788

774

size_t out_size = strlen(out);

789

775

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

790

out_size - written));

776

out_size - written));

791

777

if(ret == -1){

792

778

int e = errno;

793

779

perror_plus("write");

813

799

}

814

800

815

801

if(debug){

816

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

802

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

817

803

}

818

804

819

805

if(quit_now){

839

825

840

826

if(ret != GNUTLS_E_SUCCESS){

841

827

if(debug){

842

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

828

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

843

829

gnutls_perror(ret);

844

830

}

845

831

errno = EPROTO;

849

835

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

850

836

851

837

if(debug){

852

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

853

" %s\n", ip);

838

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

839

ip);

854

840

}

855

841

856

842

while(true){

861

847

}

862

848

863

849

buffer_capacity = incbuffer(&buffer, buffer_length,

864

buffer_capacity);

850

buffer_capacity);

865

851

if(buffer_capacity == 0){

866

852

int e = errno;

867

853

perror_plus("incbuffer");

894

880

}

895

881

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

896

882

if(ret < 0){

897

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

898

"***\n");

883

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

899

884

gnutls_perror(ret);

900

885

errno = EPROTO;

901

886

goto mandos_end;

902

887

}

903

888

break;

904

889

default:

905

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

906

" encrypted session with Mandos server\n");

890

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

891

" encrypted session with Mandos server\n");

907

892

gnutls_bye(session, GNUTLS_SHUT_RDWR);

908

893

errno = EIO;

909

894

goto mandos_end;

914

899

}

915

900

916

901

if(debug){

917

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

902

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

918

903

}

919

904

920

905

if(quit_now){

932

917

933

918

if(buffer_length > 0){

934

919

ssize_t decrypted_buffer_size;

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

920

decrypted_buffer_size = pgp_packet_decrypt(buffer,

921

buffer_length,

936

922

&decrypted_buffer);

937

923

if(decrypted_buffer_size >= 0){

938

924

949

935

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

950

936

int e = errno;

951

937

if(debug){

952

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

953

strerror(errno));

938

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

939

strerror(errno));

954

940

}

955

941

errno = e;

956

942

goto mandos_end;

1013

999

switch(event){

1014

1000

default:

1015

1001

case AVAHI_RESOLVER_FAILURE:

1016

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

1017

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

1018

domain,

1019

avahi_strerror(avahi_server_errno(mc.server)));

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)));

1020

1005

break;

1021

1006

1022

1007

case AVAHI_RESOLVER_FOUND:

1024

1009

char ip[AVAHI_ADDRESS_STR_MAX];

1025

1010

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

1026

1011

if(debug){

1027

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

1028

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

1029

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

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);

1030

1015

}

1031

1016

int ret = start_mandos_communication(ip, port, interface,

1032

1017

avahi_proto_to_af(proto));

1033

1018

if(ret == 0){

1034

1019

avahi_simple_poll_quit(mc.simple_poll);

1035

1020

} else {

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1038

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1039

" list\n", name);

1040

}

1021

ret = add_server(ip, port, interface,

1022

avahi_proto_to_af(proto));

1041

1023

}

1042

1024

}

1043

1025

}

1067

1049

default:

1068

1050

case AVAHI_BROWSER_FAILURE:

1069

1051

1070

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

1071

avahi_strerror(avahi_server_errno(mc.server)));

1052

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

1053

avahi_strerror(avahi_server_errno(mc.server)));

1072

1054

avahi_simple_poll_quit(mc.simple_poll);

1073

1055

return;

1074

1056

1081

1063

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

1082

1064

name, type, domain, protocol, 0,

1083

1065

resolve_callback, NULL) == NULL)

1084

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

1085

" %s\n", name,

1086

avahi_strerror(avahi_server_errno(mc.server)));

1066

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

1067

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

1087

1068

break;

1088

1069

1089

1070

case AVAHI_BROWSER_REMOVE:

1092

1073

case AVAHI_BROWSER_ALL_FOR_NOW:

1093

1074

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1094

1075

if(debug){

1095

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

1096

" searching...\n");

1076

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

1097

1077

}

1098

1078

break;

1099

1079

}

1138

1118

/* Reject the loopback device */

1139

1119

if(ifr->ifr_flags & IFF_LOOPBACK){

1140

1120

if(debug){

1141

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

1142

ifname);

1121

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

1122

ifname);

1143

1123

}

1144

1124

return false;

1145

1125

}

1146

1126

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

1147

1127

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

1148

1128

if(debug){

1149

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

1150

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

1129

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

1130

ifname);

1151

1131

}

1152

1132

return true;

1153

1133

}

1154

1134

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

1155

1135

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

1156

1136

if(debug){

1157

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1158

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

1137

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

1138

ifname);

1159

1139

}

1160

1140

return false;

1161

1141

}

1162

1142

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

1163

1143

if(ifr->ifr_flags & IFF_NOARP){

1164

1144

if(debug){

1165

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

1166

ifname);

1145

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

1167

1146

}

1168

1147

return false;

1169

1148

}

1170

1149

1171

1150

/* Accept this device */

1172

1151

if(debug){

1173

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

1152

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

1174

1153

}

1175

1154

return true;

1176

1155

}

1181

1160

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

1182

1161

*/

1183

1162

int good_interface(const struct dirent *if_entry){

1163

int ret;

1184

1164

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

1185

1165

return 0;

1186

1166

}

1187

1188

1167

struct ifreq ifr;

1168

1189

1169

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

1190

if(debug){

1191

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

1192

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

1193

}

1194

1170

return 0;

1195

1171

}

1196

1172

1206

1182

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

1207

1183

*/

1208

1184

int up_interface(const struct dirent *if_entry){

1185

ssize_t ssret;

1186

char *flagname = NULL;

1209

1187

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

1210

1188

return 0;

1211

1189

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

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

1222

1253

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

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);

1242

1286

}

1243

1287

return 1;

1244

1288

}

1257

1301

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

1258

1302

int runnable_hook(const struct dirent *direntry){

1259

1303

int ret;

1260

size_t sret;

1261

1304

struct stat st;

1262

1305

1263

1306

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

1265

1308

return 0;

1266

1309

}

1267

1310

1268

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

1269

"abcdefghijklmnopqrstuvwxyz"

1270

"0123456789"

1271

"_-");

1272

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

1273

/* Contains non-allowed characters */

1274

if(debug){

1275

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

1276

direntry->d_name);

1277

}

1278

return 0;

1279

}

1280

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

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);

1289

1328

if(ret == -1){

1290

1329

if(debug){

1291

perror_plus("Could not stat hook");

1330

perror_plus("Could not stat plugin");

1292

1331

}

1293

1332

return 0;

1294

1333

}

1295

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

1334

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

1296

1335

/* Not a regular file */

1297

if(debug){

1298

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

1299

direntry->d_name);

1300

}

1301

1336

return 0;

1302

1337

}

1303

1338

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

1304

1339

/* Not executable */

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1309

1340

return 0;

1310

1341

}

1311

if(debug){

1312

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

1313

direntry->d_name);

1314

}

1315

1342

return 1;

1316

1343

}

1317

1344

1324

1351

while(true){

1325

1352

if(mc.current_server == NULL){

1326

1353

if (debug){

1327

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

1328

" No timeout!\n");

1354

fprintf(stderr,

1355

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

1329

1356

}

1330

1357

ret = avahi_simple_poll_iterate(s, -1);

1331

1358

} else {

1332

1359

if (debug){

1333

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

1334

" it, or wait\n");

1360

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

1361

" or wait\n");

1335

1362

}

1336

1363

/* the current time */

1337

1364

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1353

1380

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

1354

1381

1355

1382

if (debug){

1356

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

1357

block_time);

1383

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

1358

1384

}

1359

1385

1360

1386

if(block_time <= 0){

1380

1406

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

1381

1407

}

1382

1408

if(ret != 0){

1383

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

1409

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

1384

1410

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

1385

1411

}

1386

1412

}

1387

1413

}

1388

1414

}

1389

1415

1390

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

1391

const float delay){

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1397

if(numhooks == -1){

1398

perror_plus("scandir");

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1406

perror_plus("asprintf");

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1475

free(delaystring);

1476

if(connect_to != NULL){

1477

ret = setenv("CONNECT", connect_to, 1);

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

1524

}

1525

1526

1416

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

1527

1417

AvahiSServiceBrowser *sb = NULL;

1528

1418

int error;

1608

1498

.group = 2 },

1609

1499

{ .name = "retry", .key = 132,

1610

1500

.arg = "SECONDS",

1611

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

1612

.group = 2 },

1613

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

1614

.arg = "DIR",

1615

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

1501

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

1616

1502

.group = 2 },

1617

1503

/*

1618

1504

* These reproduce what we would get without ARGP_NO_HELP

1672

1558

argp_error(state, "Bad retry interval");

1673

1559

}

1674

1560

break;

1675

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

1676

hookdir = arg;

1677

break;

1678

1561

/*

1679

1562

* These reproduce what we would get without ARGP_NO_HELP

1680

1563

*/

1686

1569

argp_state_help(state, state->out_stream,

1687

1570

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1688

1571

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

1689

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

1572

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

1690

1573

exit(argp_err_exit_status);

1691

1574

break;

1692

1575

default:

1719

1602

{

1720

1603

/* Work around Debian bug #633582:

1721

1604

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

1605

struct stat st;

1722

1606

1723

1607

/* Re-raise priviliges */

1724

1608

errno = 0;

1725

1609

ret = seteuid(0);

1726

1610

if(ret == -1){

1727

1611

perror_plus("seteuid");

1728

} else {

1729

struct stat st;

1730

1731

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

1732

int seckey_fd = open(seckey, O_RDONLY);

1733

if(seckey_fd == -1){

1734

perror_plus("open");

1735

} else {

1736

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

1737

if(ret == -1){

1738

perror_plus("fstat");

1739

} else {

1740

if(S_ISREG(st.st_mode)

1741

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

1742

ret = fchown(seckey_fd, uid, gid);

1743

if(ret == -1){

1744

perror_plus("fchown");

1745

}

1746

}

1747

}

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

1749

}

1750

}

1751

1752

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

1753

int pubkey_fd = open(pubkey, O_RDONLY);

1754

if(pubkey_fd == -1){

1755

perror_plus("open");

1756

} else {

1757

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

1758

if(ret == -1){

1759

perror_plus("fstat");

1760

} else {

1761

if(S_ISREG(st.st_mode)

1762

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

1763

ret = fchown(pubkey_fd, uid, gid);

1764

if(ret == -1){

1765

perror_plus("fchown");

1766

}

1767

}

1768

}

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

1770

}

1771

}

1772

1773

/* Lower privileges */

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1612

}

1613

1614

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

1615

int seckey_fd = open(seckey, O_RDONLY);

1616

if(seckey_fd == -1){

1617

perror_plus("open");

1618

} else {

1619

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

1620

if(ret == -1){

1621

perror_plus("fstat");

1622

} else {

1623

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

1624

ret = fchown(seckey_fd, uid, gid);

1625

if(ret == -1){

1626

perror_plus("fchown");

1627

}

1628

}

1629

}

1630

TEMP_FAILURE_RETRY(close(seckey_fd));

1631

}

1632

}

1633

1634

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

1635

int pubkey_fd = open(pubkey, O_RDONLY);

1636

if(pubkey_fd == -1){

1637

perror_plus("open");

1638

} else {

1639

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

1640

if(ret == -1){

1641

perror_plus("fstat");

1642

} else {

1643

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

1644

ret = fchown(pubkey_fd, uid, gid);

1645

if(ret == -1){

1646

perror_plus("fchown");

1647

}

1648

}

1649

}

1650

TEMP_FAILURE_RETRY(close(pubkey_fd));

1651

}

1652

}

1653

1654

/* Lower privileges */

1655

errno = 0;

1656

ret = seteuid(uid);

1657

if(ret == -1){

1658

perror_plus("seteuid");

1779

1659

}

1780

1660

}

1781

1661

1782

/* Run network hooks */

1783

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

1784

goto end;

1662

/* Find network hooks and run them */

1663

{

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);

1785

1697

}

1786

1698

1787

1699

if(not debug){

1790

1702

1791

1703

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

1792

1704

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1705

ret = scandir(sys_class_net, &direntries, good_interface,

1795

1706

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

1707

if(ret >= 1){

1803

/* Pick the first interface returned */

1708

/* Pick the first good interface */

1804

1709

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

1805

1710

if(debug){

1806

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

1711

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

1807

1712

}

1808

1713

if(interface == NULL){

1809

1714

perror_plus("malloc");

1814

1719

free(direntries);

1815

1720

} else {

1816

1721

free(direntries);

1817

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

1722

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

1818

1723

exitcode = EXIT_FAILURE;

1819

1724

goto end;

1820

1725

}

1826

1731

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

1827

1732

mc.simple_poll = avahi_simple_poll_new();

1828

1733

if(mc.simple_poll == NULL){

1829

fprintf_plus(stderr,

1830

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

1734

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

1831

1735

exitcode = EX_UNAVAILABLE;

1832

1736

goto end;

1833

1737

}

1899

1803

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

1900

1804

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

1805

if(if_index == 0){

1902

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

1806

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

1903

1807

exitcode = EX_UNAVAILABLE;

1904

1808

goto end;

1905

1809

}

2025

1929

#endif /* __linux__ */

2026

1930

/* Lower privileges */

2027

1931

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

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

}

2032

1944

}

2033

1945

}

2034

1946

2038

1950

2039

1951

ret = init_gnutls_global(pubkey, seckey);

2040

1952

if(ret == -1){

2041

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

1953

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

2042

1954

exitcode = EX_UNAVAILABLE;

2043

1955

goto end;

2044

1956

} else {

2060

1972

}

2061

1973

2062

1974

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

2063

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

1975

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

2064

1976

exitcode = EX_UNAVAILABLE;

2065

1977

goto end;

2066

1978

} else {

2076

1988

/* (Mainly meant for debugging) */

2077

1989

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

2078

1990

if(address == NULL){

2079

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

1991

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

2080

1992

exitcode = EX_USAGE;

2081

1993

goto end;

2082

1994

}

2090

2002

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

2091

2003

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

2092

2004

or tmpmax != (uint16_t)tmpmax){

2093

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

2005

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

2094

2006

exitcode = EX_USAGE;

2095

2007

goto end;

2096

2008

}

2126

2038

break;

2127

2039

}

2128

2040

if(debug){

2129

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

2130

(int)retry_interval);

2041

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

2042

(int)retry_interval);

2131

2043

}

2132

2044

sleep((int)retry_interval);

2133

2045

}

2163

2075

2164

2076

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

2165

2077

if(mc.server == NULL){

2166

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

2167

avahi_strerror(error));

2078

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

2079

avahi_strerror(error));

2168

2080

exitcode = EX_UNAVAILABLE;

2169

2081

goto end;

2170

2082

}

2178

2090

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2179

2091

NULL, 0, browse_callback, NULL);

2180

2092

if(sb == NULL){

2181

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

2182

avahi_strerror(avahi_server_errno(mc.server)));

2093

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

2094

avahi_strerror(avahi_server_errno(mc.server)));

2183

2095

exitcode = EX_UNAVAILABLE;

2184

2096

goto end;

2185

2097

}

2191

2103

/* Run the main loop */

2192

2104

2193

2105

if(debug){

2194

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

2106

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

2195

2107

}

2196

2108

2197

2109

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

2110

(int)(retry_interval * 1000));

2199

2111

if(debug){

2200

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

2201

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

2112

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

2113

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

2202

2114

}

2203

2115

2204

2116

end:

2205

2117

2206

2118

if(debug){

2207

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

2119

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

2208

2120

}

2209

2121

2210

2122

/* Cleanup things */

2226

2138

if(gpgme_initialized){

2227

2139

gpgme_release(mc.ctx);

2228

2140

}

2229

2141

2230

2142

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

2231

2143

has seen */

2232

2144

if(mc.current_server != NULL){

2238

2150

}

2239

2151

}

2240

2152

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2153

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

2243

2154

2244

/* Re-raise priviliges */

2245

{

2155

/* Take down the network interface */

2156

if(take_down_interface){

2157

/* Re-raise priviliges */

2246

2158

errno = 0;

2247

2159

ret = seteuid(0);

2248

2160

if(ret == -1){

2249

2161

perror_plus("seteuid");

2250

2162

}

2251

2252

/* Take down the network interface */

2253

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

2163

if(geteuid() == 0){

2254

2164

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

2255

2165

if(ret == -1){

2256

2166

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2167

} else if(network.ifr_flags & IFF_UP) {

2258

2168

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

2259

2169

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

2260

2170

if(ret == -1){

2265

2175

if(ret == -1){

2266

2176

perror_plus("close");

2267

2177

}

2178

/* Lower privileges permanently */

2179

errno = 0;

2180

ret = setuid(uid);

2181

if(ret == -1){

2182

perror_plus("setuid");

2183

}

2268

2184

}

2269

2185

}

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

2276

2186

2277

2187

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

2278

2188

if(tempdir_created){

2292

2202

}

2293

2203

ret = remove(fullname);

2294

2204

if(ret == -1){

2295

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

2296

strerror(errno));

2205

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

2206

strerror(errno));

2297

2207

}

2298

2208

free(fullname);

2299

2209

}