/mandos/release : revision 237.16.18

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

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{

175

179

va_list ap;

176

180

va_start (ap, format);

177

181

178

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

182

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

183

program_invocation_short_name));

179

184

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

180

185

}

181

186

185

190

* "buffer_length" is how much is already used.

186

191

*/

187

192

size_t incbuffer(char **buffer, size_t buffer_length,

188

size_t buffer_capacity){

193

size_t buffer_capacity){

189

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

190

195

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

191

196

if(buffer == NULL){

197

202

}

198

203

199

204

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

200

int add_server(const char *ip, uint16_t port,

201

AvahiIfIndex if_index,

202

int af){

205

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

206

int af){

203

207

int ret;

204

208

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

205

209

if(new_server == NULL){

207

211

return -1;

208

212

}

209

213

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

210

.port = port,

211

.if_index = if_index,

212

.af = af };

214

.port = port,

215

.if_index = if_index,

216

.af = af };

213

217

if(new_server->ip == NULL){

214

218

perror_plus("strdup");

215

219

return -1;

237

241

/*

238

242

* Initialize GPGME.

239

243

*/

240

static bool init_gpgme(const char *seckey,

241

const char *pubkey, const char *tempdir){

244

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

245

const char *tempdir){

242

246

gpgme_error_t rc;

243

247

gpgme_engine_info_t engine_info;

244

248

259

263

260

264

rc = gpgme_data_new_from_fd(&pgp_data, fd);

261

265

if(rc != GPG_ERR_NO_ERROR){

262

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

263

gpgme_strsource(rc), gpgme_strerror(rc));

266

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

267

gpgme_strsource(rc), gpgme_strerror(rc));

264

268

return false;

265

269

}

266

270

267

271

rc = gpgme_op_import(mc.ctx, pgp_data);

268

272

if(rc != GPG_ERR_NO_ERROR){

269

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

270

gpgme_strsource(rc), gpgme_strerror(rc));

273

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

274

gpgme_strsource(rc), gpgme_strerror(rc));

271

275

return false;

272

276

}

273

277

280

284

}

281

285

282

286

if(debug){

283

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

287

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

284

288

}

285

289

286

290

/* Init GPGME */

287

291

gpgme_check_version(NULL);

288

292

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

289

293

if(rc != GPG_ERR_NO_ERROR){

290

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

291

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));

292

296

return false;

293

297

}

294

298

295

299

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

296

300

rc = gpgme_get_engine_info(&engine_info);

297

301

if(rc != GPG_ERR_NO_ERROR){

298

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

299

gpgme_strsource(rc), gpgme_strerror(rc));

302

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

303

gpgme_strsource(rc), gpgme_strerror(rc));

300

304

return false;

301

305

}

302

306

while(engine_info != NULL){

308

312

engine_info = engine_info->next;

309

313

}

310

314

if(engine_info == NULL){

311

fprintf(stderr, "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);

312

317

return false;

313

318

}

314

319

315

320

/* Create new GPGME "context" */

316

321

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

317

322

if(rc != GPG_ERR_NO_ERROR){

318

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

319

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));

320

326

return false;

321

327

}

322

328

341

347

ssize_t plaintext_length = 0;

342

348

343

349

if(debug){

344

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

350

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

345

351

}

346

352

347

353

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

348

354

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

349

355

0);

350

356

if(rc != GPG_ERR_NO_ERROR){

351

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

352

gpgme_strsource(rc), gpgme_strerror(rc));

357

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

358

gpgme_strsource(rc), gpgme_strerror(rc));

353

359

return -1;

354

360

}

355

361

356

362

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

357

363

rc = gpgme_data_new(&dh_plain);

358

364

if(rc != GPG_ERR_NO_ERROR){

359

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

360

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));

361

368

gpgme_data_release(dh_crypto);

362

369

return -1;

363

370

}

366

373

data buffer */

367

374

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

368

375

if(rc != GPG_ERR_NO_ERROR){

369

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

370

gpgme_strsource(rc), gpgme_strerror(rc));

376

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

377

gpgme_strsource(rc), gpgme_strerror(rc));

371

378

plaintext_length = -1;

372

379

if(debug){

373

380

gpgme_decrypt_result_t result;

374

381

result = gpgme_op_decrypt_result(mc.ctx);

375

382

if(result == NULL){

376

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

383

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

377

384

} else {

378

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

379

result->unsupported_algorithm);

380

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

381

result->wrong_key_usage);

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);

382

389

if(result->file_name != NULL){

383

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

390

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

384

391

}

385

392

gpgme_recipient_t recipient;

386

393

recipient = result->recipients;

387

394

while(recipient != NULL){

388

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

389

gpgme_pubkey_algo_name(recipient->pubkey_algo));

390

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

391

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

392

recipient->status == GPG_ERR_NO_SECKEY

393

? "No" : "Yes");

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");

394

402

recipient = recipient->next;

395

403

}

396

404

}

399

407

}

400

408

401

409

if(debug){

402

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

410

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

403

411

}

404

412

405

413

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

412

420

*plaintext = NULL;

413

421

while(true){

414

422

plaintext_capacity = incbuffer(plaintext,

415

(size_t)plaintext_length,

416

plaintext_capacity);

423

(size_t)plaintext_length,

424

plaintext_capacity);

417

425

if(plaintext_capacity == 0){

418

perror_plus("incbuffer");

419

plaintext_length = -1;

420

goto decrypt_end;

426

perror_plus("incbuffer");

427

plaintext_length = -1;

428

goto decrypt_end;

421

429

}

422

430

423

431

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

436

444

}

437

445

438

446

if(debug){

439

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

447

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

440

448

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

441

449

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

442

450

}

464

472

/* GnuTLS log function callback */

465

473

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

466

474

const char* string){

467

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

475

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

468

476

}

469

477

470

478

static int init_gnutls_global(const char *pubkeyfilename,

472

480

int ret;

473

481

474

482

if(debug){

475

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

483

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

476

484

}

477

485

478

486

ret = gnutls_global_init();

479

487

if(ret != GNUTLS_E_SUCCESS){

480

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

481

safer_gnutls_strerror(ret));

488

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

489

safer_gnutls_strerror(ret));

482

490

return -1;

483

491

}

484

492

493

501

/* OpenPGP credentials */

494

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

495

503

if(ret != GNUTLS_E_SUCCESS){

496

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

497

safer_gnutls_strerror(ret));

504

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

505

safer_gnutls_strerror(ret));

498

506

gnutls_global_deinit();

499

507

return -1;

500

508

}

501

509

502

510

if(debug){

503

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

504

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

505

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);

506

515

}

507

516

508

517

ret = gnutls_certificate_set_openpgp_key_file

509

518

(mc.cred, pubkeyfilename, seckeyfilename,

510

519

GNUTLS_OPENPGP_FMT_BASE64);

511

520

if(ret != GNUTLS_E_SUCCESS){

512

fprintf(stderr,

513

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

514

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

515

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

516

safer_gnutls_strerror(ret));

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));

517

526

goto globalfail;

518

527

}

519

528

520

529

/* GnuTLS server initialization */

521

530

ret = gnutls_dh_params_init(&mc.dh_params);

522

531

if(ret != GNUTLS_E_SUCCESS){

523

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

524

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

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

" initialization: %s\n",

534

safer_gnutls_strerror(ret));

525

535

goto globalfail;

526

536

}

527

537

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

528

538

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

531

541

goto globalfail;

532

542

}

533

543

553

563

}

554

564

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

555

565

if(ret != GNUTLS_E_SUCCESS){

556

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

557

safer_gnutls_strerror(ret));

566

fprintf_plus(stderr,

567

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

568

safer_gnutls_strerror(ret));

558

569

}

559

570

560

571

{

567

578

}

568

579

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

569

580

if(ret != GNUTLS_E_SUCCESS){

570

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

571

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

572

safer_gnutls_strerror(ret));

581

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

582

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

583

safer_gnutls_strerror(ret));

573

584

gnutls_deinit(*session);

574

585

return -1;

575

586

}

584

595

}

585

596

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

586

597

if(ret != GNUTLS_E_SUCCESS){

587

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

588

safer_gnutls_strerror(ret));

598

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

599

safer_gnutls_strerror(ret));

589

600

gnutls_deinit(*session);

590

601

return -1;

591

602

}

636

647

pf = PF_INET;

637

648

break;

638

649

default:

639

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

650

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

640

651

errno = EINVAL;

641

652

return -1;

642

653

}

647

658

}

648

659

649

660

if(debug){

650

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

651

"\n", ip, port);

661

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

662

PRIu16 "\n", ip, port);

652

663

}

653

664

654

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

680

691

}

681

692

if(ret == 0){

682

693

int e = errno;

683

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

694

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

684

695

errno = e;

685

696

goto mandos_end;

686

697

}

691

702

692

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

693

704

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

694

-Wunreachable-code*/

705

-Wunreachable-code*/

695

706

if(if_index == AVAHI_IF_UNSPEC){

696

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

697

" without a network interface\n");

707

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

708

" incomplete without a network interface\n");

698

709

errno = EINVAL;

699

710

goto mandos_end;

700

711

}

718

729

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

719

730

perror_plus("if_indextoname");

720

731

} else {

721

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

722

ip, interface, port);

732

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

733

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

723

734

}

724

735

} else {

725

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

726

port);

736

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

737

ip, port);

727

738

}

728

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

729

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

739

750

perror_plus("inet_ntop");

740

751

} else {

741

752

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

742

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

753

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

743

754

}

744

755

}

745

756

}

773

784

while(true){

774

785

size_t out_size = strlen(out);

775

786

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

776

out_size - written));

787

out_size - written));

777

788

if(ret == -1){

778

789

int e = errno;

779

790

perror_plus("write");

799

810

}

800

811

801

812

if(debug){

802

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

813

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

803

814

}

804

815

805

816

if(quit_now){

825

836

826

837

if(ret != GNUTLS_E_SUCCESS){

827

838

if(debug){

828

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

839

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

829

840

gnutls_perror(ret);

830

841

}

831

842

errno = EPROTO;

835

846

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

836

847

837

848

if(debug){

838

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

839

ip);

849

fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"

850

" %s\n", ip);

840

851

}

841

852

842

853

while(true){

847

858

}

848

859

849

860

buffer_capacity = incbuffer(&buffer, buffer_length,

850

buffer_capacity);

861

buffer_capacity);

851

862

if(buffer_capacity == 0){

852

863

int e = errno;

853

864

perror_plus("incbuffer");

880

891

}

881

892

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

882

893

if(ret < 0){

883

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

894

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

895

"***\n");

884

896

gnutls_perror(ret);

885

897

errno = EPROTO;

886

898

goto mandos_end;

887

899

}

888

900

break;

889

901

default:

890

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

891

" encrypted session with Mandos server\n");

902

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

903

" encrypted session with Mandos server\n");

892

904

gnutls_bye(session, GNUTLS_SHUT_RDWR);

893

905

errno = EIO;

894

906

goto mandos_end;

899

911

}

900

912

901

913

if(debug){

902

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

914

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

903

915

}

904

916

905

917

if(quit_now){

917

929

918

930

if(buffer_length > 0){

919

931

ssize_t decrypted_buffer_size;

920

decrypted_buffer_size = pgp_packet_decrypt(buffer,

921

buffer_length,

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

922

933

&decrypted_buffer);

923

934

if(decrypted_buffer_size >= 0){

924

935

946

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

936

947

int e = errno;

937

948

if(debug){

938

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

939

strerror(errno));

949

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

950

strerror(errno));

940

951

}

941

952

errno = e;

942

953

goto mandos_end;

999

1010

switch(event){

1000

1011

default:

1001

1012

case AVAHI_RESOLVER_FAILURE:

1002

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

1003

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

1004

avahi_strerror(avahi_server_errno(mc.server)));

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)));

1005

1017

break;

1006

1018

1007

1019

case AVAHI_RESOLVER_FOUND:

1009

1021

char ip[AVAHI_ADDRESS_STR_MAX];

1010

1022

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

1011

1023

if(debug){

1012

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

1013

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

1014

ip, (intmax_t)interface, port);

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);

1015

1027

}

1016

1028

int ret = start_mandos_communication(ip, port, interface,

1017

1029

avahi_proto_to_af(proto));

1049

1061

default:

1050

1062

case AVAHI_BROWSER_FAILURE:

1051

1063

1052

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

1053

avahi_strerror(avahi_server_errno(mc.server)));

1064

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

1065

avahi_strerror(avahi_server_errno(mc.server)));

1054

1066

avahi_simple_poll_quit(mc.simple_poll);

1055

1067

return;

1056

1068

1063

1075

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

1064

1076

name, type, domain, protocol, 0,

1065

1077

resolve_callback, NULL) == NULL)

1066

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

1067

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)));

1068

1081

break;

1069

1082

1070

1083

case AVAHI_BROWSER_REMOVE:

1073

1086

case AVAHI_BROWSER_ALL_FOR_NOW:

1074

1087

case AVAHI_BROWSER_CACHE_EXHAUSTED:

1075

1088

if(debug){

1076

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

1089

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

1090

" searching...\n");

1077

1091

}

1078

1092

break;

1079

1093

}

1118

1132

/* Reject the loopback device */

1119

1133

if(ifr->ifr_flags & IFF_LOOPBACK){

1120

1134

if(debug){

1121

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

1122

ifname);

1135

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

1136

ifname);

1123

1137

}

1124

1138

return false;

1125

1139

}

1126

1140

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

1127

1141

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

1128

1142

if(debug){

1129

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

1130

ifname);

1143

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

1144

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

1131

1145

}

1132

1146

return true;

1133

1147

}

1134

1148

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

1135

1149

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

1136

1150

if(debug){

1137

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

1138

ifname);

1151

fprintf_plus(stderr, "Rejecting non-broadcast interface"

1152

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

1139

1153

}

1140

1154

return false;

1141

1155

}

1142

1156

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

1143

1157

if(ifr->ifr_flags & IFF_NOARP){

1144

1158

if(debug){

1145

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

1159

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

1160

ifname);

1146

1161

}

1147

1162

return false;

1148

1163

}

1149

1164

1150

1165

/* Accept this device */

1151

1166

if(debug){

1152

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

1167

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

1153

1168

}

1154

1169

return true;

1155

1170

}

1160

1175

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

1161

1176

*/

1162

1177

int good_interface(const struct dirent *if_entry){

1163

int ret;

1164

1178

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

1165

1179

return 0;

1166

1180

}

1181

1167

1182

struct ifreq ifr;

1168

1169

1183

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

1184

if(debug){

1185

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

1186

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

1187

}

1170

1188

return 0;

1171

1189

}

1172

1190

1182

1200

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

1183

1201

*/

1184

1202

int up_interface(const struct dirent *if_entry){

1185

ssize_t ssret;

1186

char *flagname = NULL;

1187

1203

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

1188

1204

return 0;

1189

1205

}

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

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

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

1211

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

1212

}

1213

return 0;

1214

}

1215

1253

1216

/* Reject down interfaces */

1254

if(not (flags & IFF_UP)){

1255

return 0;

1256

}

1257

1258

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

1259

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

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 1;

1265

}

1266

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

1267

if(not (flags & IFF_BROADCAST)){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

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

1275

if(flags & IFF_NOARP){

1276

if(debug){

1277

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

1278

if_entry->d_name);

1279

}

1280

return 0;

1281

}

1282

/* Accept this device */

1283

if(debug){

1284

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

1285

if_entry->d_name);

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1286

1236

}

1287

1237

return 1;

1288

1238

}

1301

1251

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

1302

1252

int runnable_hook(const struct dirent *direntry){

1303

1253

int ret;

1254

size_t sret;

1304

1255

struct stat st;

1305

1256

1306

1257

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

1308

1259

return 0;

1309

1260

}

1310

1261

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);

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);

1328

1283

if(ret == -1){

1329

1284

if(debug){

1330

perror_plus("Could not stat plugin");

1285

perror_plus("Could not stat hook");

1331

1286

}

1332

1287

return 0;

1333

1288

}

1334

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

1289

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

1335

1290

/* Not a regular file */

1291

if(debug){

1292

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

1293

direntry->d_name);

1294

}

1336

1295

return 0;

1337

1296

}

1338

1297

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

1339

1298

/* Not executable */

1299

if(debug){

1300

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

1301

direntry->d_name);

1302

}

1340

1303

return 0;

1341

1304

}

1305

if(debug){

1306

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

1307

direntry->d_name);

1308

}

1342

1309

return 1;

1343

1310

}

1344

1311

1351

1318

while(true){

1352

1319

if(mc.current_server == NULL){

1353

1320

if (debug){

1354

fprintf(stderr,

1355

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

1321

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

1322

" No timeout!\n");

1356

1323

}

1357

1324

ret = avahi_simple_poll_iterate(s, -1);

1358

1325

} else {

1359

1326

if (debug){

1360

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

1361

" or wait\n");

1327

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

1328

" it, or wait\n");

1362

1329

}

1363

1330

/* the current time */

1364

1331

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1380

1347

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

1381

1348

1382

1349

if (debug){

1383

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

1350

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

1351

block_time);

1384

1352

}

1385

1353

1386

1354

if(block_time <= 0){

1406

1374

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

1407

1375

}

1408

1376

if(ret != 0){

1409

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

1377

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

1410

1378

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

1411

1379

}

1412

1380

}

1413

1381

}

1414

1382

}

1415

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

1416

1511

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

1417

1512

AvahiSServiceBrowser *sb = NULL;

1418

1513

int error;

1500

1595

.arg = "SECONDS",

1501

1596

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

1502

1597

.group = 2 },

1598

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

1599

.arg = "DIR",

1600

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

1601

.group = 2 },

1503

1602

/*

1504

1603

* These reproduce what we would get without ARGP_NO_HELP

1505

1604

*/

1558

1657

argp_error(state, "Bad retry interval");

1559

1658

}

1560

1659

break;

1660

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

1661

hookdir = arg;

1662

break;

1561

1663

/*

1562

1664

* These reproduce what we would get without ARGP_NO_HELP

1563

1665

*/

1569

1671

argp_state_help(state, state->out_stream,

1570

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1571

1673

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

1572

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);

1573

1677

exit(argp_err_exit_status);

1574

1678

break;

1575

1679

default:

1602

1706

{

1603

1707

/* Work around Debian bug #633582:

1604

1708

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

1605

struct stat st;

1606

1709

1607

1710

/* Re-raise priviliges */

1608

1711

errno = 0;

1609

1712

ret = seteuid(0);

1610

1713

if(ret == -1){

1611

1714

perror_plus("seteuid");

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");

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

}

1659

1766

}

1660

1767

}

1661

1768

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);

1769

/* Run network hooks */

1770

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

1771

goto end;

1697

1772

}

1698

1773

1699

1774

if(not debug){

1702

1777

1703

1778

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

1704

1779

struct dirent **direntries;

1705

ret = scandir(sys_class_net, &direntries, good_interface,

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1706

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1707

1789

if(ret >= 1){

1708

/* Pick the first good interface */

1790

/* Pick the first interface returned */

1709

1791

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

1710

1792

if(debug){

1711

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

1793

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

1712

1794

}

1713

1795

if(interface == NULL){

1714

1796

perror_plus("malloc");

1719

1801

free(direntries);

1720

1802

} else {

1721

1803

free(direntries);

1722

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

1804

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

1723

1805

exitcode = EXIT_FAILURE;

1724

1806

goto end;

1725

1807

}

1731

1813

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

1732

1814

mc.simple_poll = avahi_simple_poll_new();

1733

1815

if(mc.simple_poll == NULL){

1734

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

1816

fprintf_plus(stderr,

1817

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

1735

1818

exitcode = EX_UNAVAILABLE;

1736

1819

goto end;

1737

1820

}

1803

1886

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

1804

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1805

1888

if(if_index == 0){

1806

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

1889

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

1807

1890

exitcode = EX_UNAVAILABLE;

1808

1891

goto end;

1809

1892

}

1929

2012

#endif /* __linux__ */

1930

2013

/* Lower privileges */

1931

2014

errno = 0;

1932

if(take_down_interface){

1933

/* Lower privileges */

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

1938

} else {

1939

/* Lower privileges permanently */

1940

ret = setuid(uid);

1941

if(ret == -1){

1942

perror_plus("setuid");

1943

}

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

1944

2019

}

1945

2020

}

1946

2021

1950

2025

1951

2026

ret = init_gnutls_global(pubkey, seckey);

1952

2027

if(ret == -1){

1953

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

2028

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

1954

2029

exitcode = EX_UNAVAILABLE;

1955

2030

goto end;

1956

2031

} else {

1972

2047

}

1973

2048

1974

2049

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

1975

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

2050

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

1976

2051

exitcode = EX_UNAVAILABLE;

1977

2052

goto end;

1978

2053

} else {

1988

2063

/* (Mainly meant for debugging) */

1989

2064

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

1990

2065

if(address == NULL){

1991

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

2066

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

1992

2067

exitcode = EX_USAGE;

1993

2068

goto end;

1994

2069

}

2002

2077

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

2003

2078

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

2004

2079

or tmpmax != (uint16_t)tmpmax){

2005

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

2080

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

2006

2081

exitcode = EX_USAGE;

2007

2082

goto end;

2008

2083

}

2038

2113

break;

2039

2114

}

2040

2115

if(debug){

2041

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

2042

(int)retry_interval);

2116

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

2117

(int)retry_interval);

2043

2118

}

2044

2119

sleep((int)retry_interval);

2045

2120

}

2075

2150

2076

2151

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

2077

2152

if(mc.server == NULL){

2078

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

2079

avahi_strerror(error));

2153

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

2154

avahi_strerror(error));

2080

2155

exitcode = EX_UNAVAILABLE;

2081

2156

goto end;

2082

2157

}

2090

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2091

2166

NULL, 0, browse_callback, NULL);

2092

2167

if(sb == NULL){

2093

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

2094

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)));

2095

2170

exitcode = EX_UNAVAILABLE;

2096

2171

goto end;

2097

2172

}

2103

2178

/* Run the main loop */

2104

2179

2105

2180

if(debug){

2106

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

2181

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

2107

2182

}

2108

2183

2109

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2110

2185

(int)(retry_interval * 1000));

2111

2186

if(debug){

2112

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

2113

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

2187

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

2188

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

2114

2189

}

2115

2190

2116

2191

end:

2117

2192

2118

2193

if(debug){

2119

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

2194

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

2120

2195

}

2121

2196

2122

2197

/* Cleanup things */

2138

2213

if(gpgme_initialized){

2139

2214

gpgme_release(mc.ctx);

2140

2215

}

2141

2216

2142

2217

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

2143

2218

has seen */

2144

2219

if(mc.current_server != NULL){

2150

2225

}

2151

2226

}

2152

2227

2153

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

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2154

2230

2155

/* Take down the network interface */

2156

if(take_down_interface){

2157

/* Re-raise priviliges */

2231

/* Re-raise priviliges */

2232

{

2158

2233

errno = 0;

2159

2234

ret = seteuid(0);

2160

2235

if(ret == -1){

2161

2236

perror_plus("seteuid");

2162

2237

}

2163

if(geteuid() == 0){

2238

2239

/* Take down the network interface */

2240

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

2164

2241

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

2165

2242

if(ret == -1){

2166

2243

perror_plus("ioctl SIOCGIFFLAGS");

2167

} else if(network.ifr_flags & IFF_UP) {

2244

} else if(network.ifr_flags & IFF_UP){

2168

2245

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

2169

2246

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

2170

2247

if(ret == -1){

2175

2252

if(ret == -1){

2176

2253

perror_plus("close");

2177

2254

}

2178

/* Lower privileges permanently */

2179

errno = 0;

2180

ret = setuid(uid);

2181

if(ret == -1){

2182

perror_plus("setuid");

2183

}

2184

2255

}

2185

2256

}

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2186

2263

2187

2264

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

2188

2265

if(tempdir_created){

2202

2279

}

2203

2280

ret = remove(fullname);

2204

2281

if(ret == -1){

2205

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

2206

strerror(errno));

2282

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

2283

strerror(errno));

2207

2284

}

2208

2285

free(fullname);

2209

2286

}