/mandos/trunk : revision 767

9

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

10

*

11

* Everything else is

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13

14

*

15

* This file is part of Mandos.

16

*

17

* Mandos is free software: you can redistribute it and/or modify it

18

* under the terms of the GNU General Public License as published by

19

* the Free Software Foundation, either version 3 of the License, or

20

* (at your option) any later version.

21

*

22

* Mandos is distributed in the hope that it will be useful, but

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

17

* published by the Free Software Foundation, either version 3 of the

18

* License, or (at your option) any later version.

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*

20

* This program is distributed in the hope that it will be useful, but

23

21

* WITHOUT ANY WARRANTY; without even the implied warranty of

24

22

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

25

23

* General Public License for more details.

26

24

*

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25

* You should have received a copy of the GNU General Public License

28

* along with Mandos. If not, see <http://www.gnu.org/licenses/>.

26

* along with this program. If not, see

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* <http://www.gnu.org/licenses/>.

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28

*

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29

* Contact the authors at <mandos@recompile.se>.

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30

*/

47

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

48

47

strtof(), abort() */

49

48

#include <stdbool.h> /* bool, false, true */

50

#include <string.h> /* strcmp(), strlen(), strerror(),

51

asprintf(), strncpy(), strsignal()

52

*/

49

#include <string.h> /* memset(), strcmp(), strlen(),

50

strerror(), asprintf(), strcpy() */

53

51

#include <sys/ioctl.h> /* ioctl */

54

52

#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

55

53

sockaddr_in6, PF_INET6,

59

57

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

60

58

inet_pton(), connect(),

61

59

getnameinfo() */

62

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

60

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

63

61

#include <dirent.h> /* opendir(), struct dirent, readdir()

64

62

*/

65

63

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

66

64

strtoimax() */

67

#include <errno.h> /* perror(), errno, EINTR, EINVAL,

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

65

#include <errno.h> /* perror(), errno,

72

66

program_invocation_short_name */

73

67

#include <time.h> /* nanosleep(), time(), sleep() */

74

68

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

123

117

gnutls_*

124

118

init_gnutls_session(),

125

119

GNUTLS_* */

126

#if GNUTLS_VERSION_NUMBER < 0x030600

127

120

#include <gnutls/openpgp.h>

128

121

/* gnutls_certificate_set_openpgp_key_file(),

129

122

GNUTLS_OPENPGP_FMT_BASE64 */

130

#elif GNUTLS_VERSION_NUMBER >= 0x030606

131

#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,

132

GNUTLS_PKCS_PLAIN,

133

GNUTLS_PKCS_NULL_PASSWORD */

134

#endif

135

123

136

124

/* GPGME */

137

125

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

145

133

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

146

134

#define SECKEY "seckey.txt"

147

135

#define PUBKEY "pubkey.txt"

148

#define TLS_PRIVKEY "tls-privkey.pem"

149

#define TLS_PUBKEY "tls-pubkey.pem"

150

136

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

151

137

152

138

bool debug = false;

280

266

return true;

281

267

}

282

268

283

/* Set effective uid to 0, return errno */

284

__attribute__((warn_unused_result))

285

int raise_privileges(void){

286

int old_errno = errno;

287

int ret = 0;

288

if(seteuid(0) == -1){

289

ret = errno;

290

}

291

errno = old_errno;

292

return ret;

293

}

294

295

/* Set effective and real user ID to 0. Return errno. */

296

__attribute__((warn_unused_result))

297

int raise_privileges_permanently(void){

298

int old_errno = errno;

299

int ret = raise_privileges();

300

if(ret != 0){

301

errno = old_errno;

302

return ret;

303

}

304

if(setuid(0) == -1){

305

ret = errno;

306

}

307

errno = old_errno;

308

return ret;

309

}

310

311

/* Set effective user ID to unprivileged saved user ID */

312

__attribute__((warn_unused_result))

313

int lower_privileges(void){

314

int old_errno = errno;

315

int ret = 0;

316

if(seteuid(uid) == -1){

317

ret = errno;

318

}

319

errno = old_errno;

320

return ret;

321

}

322

323

/* Lower privileges permanently */

324

__attribute__((warn_unused_result))

325

int lower_privileges_permanently(void){

326

int old_errno = errno;

327

int ret = 0;

328

if(setuid(uid) == -1){

329

ret = errno;

330

}

331

errno = old_errno;

332

return ret;

333

}

334

335

269

/*

336

270

* Initialize GPGME.

337

271

*/

357

291

return false;

358

292

}

359

293

360

/* Workaround for systems without a real-time clock; see also

361

Debian bug #894495: <https://bugs.debian.org/894495> */

362

do {

363

{

364

time_t currtime = time(NULL);

365

if(currtime != (time_t)-1){

366

struct tm tm;

367

if(gmtime_r(&currtime, &tm) == NULL) {

368

perror_plus("gmtime_r");

369

break;

370

}

371

if(tm.tm_year != 70 or tm.tm_mon != 0){

372

break;

373

}

374

if(debug){

375

fprintf_plus(stderr, "System clock is January 1970");

376

}

377

} else {

378

if(debug){

379

fprintf_plus(stderr, "System clock is invalid");

380

}

381

}

382

}

383

struct stat keystat;

384

ret = fstat(fd, &keystat);

385

if(ret != 0){

386

perror_plus("fstat");

387

break;

388

}

389

ret = raise_privileges();

390

if(ret != 0){

391

errno = ret;

392

perror_plus("Failed to raise privileges");

393

break;

394

}

395

if(debug){

396

fprintf_plus(stderr,

397

"Setting system clock to key file mtime");

398

}

399

time_t keytime = keystat.st_mtim.tv_sec;

400

if(stime(&keytime) != 0){

401

perror_plus("stime");

402

}

403

ret = lower_privileges();

404

if(ret != 0){

405

errno = ret;

406

perror_plus("Failed to lower privileges");

407

}

408

} while(false);

409

410

294

rc = gpgme_data_new_from_fd(&pgp_data, fd);

411

295

if(rc != GPG_ERR_NO_ERROR){

412

296

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

420

304

gpgme_strsource(rc), gpgme_strerror(rc));

421

305

return false;

422

306

}

423

{

424

gpgme_import_result_t import_result

425

= gpgme_op_import_result(mc->ctx);

426

if((import_result->imported < 1

427

or import_result->not_imported > 0)

428

and import_result->unchanged == 0){

429

fprintf_plus(stderr, "bad gpgme_op_import_results:\n");

430

fprintf_plus(stderr,

431

"The total number of considered keys: %d\n",

432

import_result->considered);

433

fprintf_plus(stderr,

434

"The number of keys without user ID: %d\n",

435

import_result->no_user_id);

436

fprintf_plus(stderr,

437

"The total number of imported keys: %d\n",

438

import_result->imported);

439

fprintf_plus(stderr, "The number of imported RSA keys: %d\n",

440

import_result->imported_rsa);

441

fprintf_plus(stderr, "The number of unchanged keys: %d\n",

442

import_result->unchanged);

443

fprintf_plus(stderr, "The number of new user IDs: %d\n",

444

import_result->new_user_ids);

445

fprintf_plus(stderr, "The number of new sub keys: %d\n",

446

import_result->new_sub_keys);

447

fprintf_plus(stderr, "The number of new signatures: %d\n",

448

import_result->new_signatures);

449

fprintf_plus(stderr, "The number of new revocations: %d\n",

450

import_result->new_revocations);

451

fprintf_plus(stderr,

452

"The total number of secret keys read: %d\n",

453

import_result->secret_read);

454

fprintf_plus(stderr,

455

"The number of imported secret keys: %d\n",

456

import_result->secret_imported);

457

fprintf_plus(stderr,

458

"The number of unchanged secret keys: %d\n",

459

import_result->secret_unchanged);

460

fprintf_plus(stderr, "The number of keys not imported: %d\n",

461

import_result->not_imported);

462

for(gpgme_import_status_t import_status

463

= import_result->imports;

464

import_status != NULL;

465

import_status = import_status->next){

466

fprintf_plus(stderr, "Import status for key: %s\n",

467

import_status->fpr);

468

if(import_status->result != GPG_ERR_NO_ERROR){

469

fprintf_plus(stderr, "Import result: %s: %s\n",

470

gpgme_strsource(import_status->result),

471

gpgme_strerror(import_status->result));

472

}

473

fprintf_plus(stderr, "Key status:\n");

474

fprintf_plus(stderr,

475

import_status->status & GPGME_IMPORT_NEW

476

? "The key was new.\n"

477

: "The key was not new.\n");

478

fprintf_plus(stderr,

479

import_status->status & GPGME_IMPORT_UID

480

? "The key contained new user IDs.\n"

481

: "The key did not contain new user IDs.\n");

482

fprintf_plus(stderr,

483

import_status->status & GPGME_IMPORT_SIG

484

? "The key contained new signatures.\n"

485

: "The key did not contain new signatures.\n");

486

fprintf_plus(stderr,

487

import_status->status & GPGME_IMPORT_SUBKEY

488

? "The key contained new sub keys.\n"

489

: "The key did not contain new sub keys.\n");

490

fprintf_plus(stderr,

491

import_status->status & GPGME_IMPORT_SECRET

492

? "The key contained a secret key.\n"

493

: "The key did not contain a secret key.\n");

494

}

495

return false;

496

}

497

}

498

307

499

ret = close(fd);

308

ret = (int)TEMP_FAILURE_RETRY(close(fd));

500

309

if(ret == -1){

501

310

perror_plus("close");

502

311

}

541

350

/* Create new GPGME "context" */

542

351

rc = gpgme_new(&(mc->ctx));

543

352

if(rc != GPG_ERR_NO_ERROR){

544

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

545

gpgme_strsource(rc), gpgme_strerror(rc));

353

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

354

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

355

gpgme_strerror(rc));

546

356

return false;

547

357

}

548

358

584

394

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

585

395

rc = gpgme_data_new(&dh_plain);

586

396

if(rc != GPG_ERR_NO_ERROR){

587

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

397

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

398

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

588

399

gpgme_strsource(rc), gpgme_strerror(rc));

589

400

gpgme_data_release(dh_crypto);

590

401

return -1;

603

414

if(result == NULL){

604

415

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

605

416

} else {

606

if(result->unsupported_algorithm != NULL) {

607

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

608

result->unsupported_algorithm);

609

}

610

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

611

result->wrong_key_usage ? "Yes" : "No");

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

612

421

if(result->file_name != NULL){

613

422

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

614

423

}

615

616

for(gpgme_recipient_t r = result->recipients; r != NULL;

617

r = r->next){

424

gpgme_recipient_t recipient;

425

recipient = result->recipients;

426

while(recipient != NULL){

618

427

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

619

gpgme_pubkey_algo_name(r->pubkey_algo));

620

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

621

431

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

622

r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

434

recipient = recipient->next;

623

435

}

624

436

}

625

437

}

701

513

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

702

514

}

703

515

704

__attribute__((nonnull(1, 2, 4), warn_unused_result))

516

__attribute__((nonnull, warn_unused_result))

705

517

static int init_gnutls_global(const char *pubkeyfilename,

706

518

const char *seckeyfilename,

707

519

const char *dhparamsfilename,

708

520

mandos_context *mc){

709

521

int ret;

522

unsigned int uret;

710

523

711

524

if(debug){

712

525

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

713

526

}

714

527

528

ret = gnutls_global_init();

529

if(ret != GNUTLS_E_SUCCESS){

530

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

531

safer_gnutls_strerror(ret));

532

return -1;

533

}

534

715

535

if(debug){

716

536

/* "Use a log level over 10 to enable all debugging options."

717

537

* - GnuTLS manual

725

545

if(ret != GNUTLS_E_SUCCESS){

726

546

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

727

547

safer_gnutls_strerror(ret));

548

gnutls_global_deinit();

728

549

return -1;

729

550

}

730

551

731

552

if(debug){

732

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

733

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

553

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

554

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

734

555

pubkeyfilename,

735

556

seckeyfilename);

736

557

}

737

558

738

#if GNUTLS_VERSION_NUMBER >= 0x030606

739

ret = gnutls_certificate_set_rawpk_key_file

740

(mc->cred, pubkeyfilename, seckeyfilename,

741

GNUTLS_X509_FMT_PEM, /* format */

742

NULL, /* pass */

743

/* key_usage */

744

GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,

745

NULL, /* names */

746

0, /* names_length */

747

/* privkey_flags */

748

GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,

749

0); /* pkcs11_flags */

750

#elif GNUTLS_VERSION_NUMBER < 0x030600

751

559

ret = gnutls_certificate_set_openpgp_key_file

752

560

(mc->cred, pubkeyfilename, seckeyfilename,

753

561

GNUTLS_OPENPGP_FMT_BASE64);

754

#else

755

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

756

#endif

757

562

if(ret != GNUTLS_E_SUCCESS){

758

563

fprintf_plus(stderr,

759

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

564

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

760

565

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

761

566

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

762

567

safer_gnutls_strerror(ret));

810

615

}

811

616

params.size += (unsigned int)bytes_read;

812

617

}

813

ret = close(dhpfile);

814

if(ret == -1){

815

perror_plus("close");

816

}

817

618

if(params.data == NULL){

818

619

dhparamsfilename = NULL;

819

620

}

828

629

safer_gnutls_strerror(ret));

829

630

dhparamsfilename = NULL;

830

631

}

831

free(params.data);

832

632

} while(false);

833

633

}

834

634

if(dhparamsfilename == NULL){

835

635

if(mc->dh_bits == 0){

836

#if GNUTLS_VERSION_NUMBER < 0x030600

837

636

/* Find out the optimal number of DH bits */

838

637

/* Try to read the private key file */

839

638

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

919

718

}

920

719

}

921

720

}

922

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

923

722

if(uret != 0){

924

723

mc->dh_bits = uret;

925

724

if(debug){

937

736

safer_gnutls_strerror(ret));

938

737

goto globalfail;

939

738

}

940

#endif

941

} else { /* dh_bits != 0 */

942

if(debug){

943

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

944

mc->dh_bits);

945

}

946

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

947

if(ret != GNUTLS_E_SUCCESS){

948

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

949

" bits): %s\n", mc->dh_bits,

950

safer_gnutls_strerror(ret));

951

goto globalfail;

952

}

953

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

739

} else if(debug){

740

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

741

mc->dh_bits);

742

}

743

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

744

if(ret != GNUTLS_E_SUCCESS){

745

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

746

" bits): %s\n", mc->dh_bits,

747

safer_gnutls_strerror(ret));

748

goto globalfail;

954

749

}

955

750

}

751

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

956

752

957

753

return 0;

958

754

959

755

globalfail:

960

756

961

757

gnutls_certificate_free_credentials(mc->cred);

758

gnutls_global_deinit();

962

759

gnutls_dh_params_deinit(mc->dh_params);

963

760

return -1;

964

761

}

969

766

int ret;

970

767

/* GnuTLS session creation */

971

768

do {

972

ret = gnutls_init(session, (GNUTLS_SERVER

973

#if GNUTLS_VERSION_NUMBER >= 0x030506

974

| GNUTLS_NO_TICKETS

975

#endif

976

#if GNUTLS_VERSION_NUMBER >= 0x030606

977

| GNUTLS_ENABLE_RAWPK

978

#endif

979

));

769

ret = gnutls_init(session, GNUTLS_SERVER);

980

770

if(quit_now){

981

771

return -1;

982

772

}

1030

820

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

1031

821

__attribute__((unused)) const char *txt){}

1032

822

823

/* Set effective uid to 0, return errno */

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

if(seteuid(0) == -1){

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

/* Set effective and real user ID to 0. Return errno. */

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

if(setuid(0) == -1){

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

/* Set effective user ID to unprivileged saved user ID */

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

if(seteuid(uid) == -1){

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

if(setuid(uid) == -1){

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

1033

875

/* Helper function to add_local_route() and delete_local_route() */

1034

876

__attribute__((nonnull, warn_unused_result))

1035

877

static bool add_delete_local_route(const bool add,

1089

931

perror_plus("dup2(devnull, STDIN_FILENO)");

1090

932

_exit(EX_OSERR);

1091

933

}

1092

ret = close(devnull);

934

ret = (int)TEMP_FAILURE_RETRY(close(devnull));

1093

935

if(ret == -1){

1094

936

perror_plus("close");

1095

937

_exit(EX_OSERR);

1112

954

helper, O_RDONLY));

1113

955

if(helper_fd == -1){

1114

956

perror_plus("openat");

1115

close(helperdir_fd);

1116

957

_exit(EX_UNAVAILABLE);

1117

958

}

1118

close(helperdir_fd);

959

TEMP_FAILURE_RETRY(close(helperdir_fd));

1119

960

#ifdef __GNUC__

1120

961

#pragma GCC diagnostic push

1121

962

#pragma GCC diagnostic ignored "-Wcast-qual"

1240

1081

bool match = false;

1241

1082

{

1242

1083

char *interface = NULL;

1243

while((interface = argz_next(mc->interfaces,

1244

mc->interfaces_size,

1245

interface))){

1084

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

1085

interface))){

1246

1086

if(if_nametoindex(interface) == (unsigned int)if_index){

1247

1087

match = true;

1248

1088

break;

1290

1130

goto mandos_end;

1291

1131

}

1292

1132

1133

memset(&to, 0, sizeof(to));

1293

1134

if(af == AF_INET6){

1294

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1295

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1296

ret = inet_pton(af, ip, &to6->sin6_addr);

1135

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

1136

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

1297

1137

} else { /* IPv4 */

1298

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1299

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1300

ret = inet_pton(af, ip, &to4->sin_addr);

1138

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

1139

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

1301

1140

}

1302

1141

if(ret < 0 ){

1303

1142

int e = errno;

1382

1221

sizeof(struct sockaddr_in));

1383

1222

}

1384

1223

if(ret < 0){

1385

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1224

if(errno == ENETUNREACH

1386

1225

and if_index != AVAHI_IF_UNSPEC

1387

1226

and connect_to == NULL

1388

1227

and not route_added and

1401

1240

with an explicit route added with the server's address.

1402

1241

1403

1242

Avahi bug reference:

1404

https://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1243

http://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1405

1244

https://bugs.debian.org/587961

1406

1245

*/

1407

1246

if(debug){

1587

1426

&decrypted_buffer, mc);

1588

1427

if(decrypted_buffer_size >= 0){

1589

1428

1590

clearerr(stdout);

1591

1429

written = 0;

1592

1430

while(written < (size_t) decrypted_buffer_size){

1593

1431

if(quit_now){

1609

1447

}

1610

1448

written += (size_t)ret;

1611

1449

}

1612

ret = fflush(stdout);

1613

if(ret != 0){

1614

int e = errno;

1615

if(debug){

1616

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

1617

strerror(errno));

1618

}

1619

errno = e;

1620

goto mandos_end;

1621

}

1622

1450

retval = 0;

1623

1451

}

1624

1452

}

1637

1465

free(decrypted_buffer);

1638

1466

free(buffer);

1639

1467

if(tcp_sd >= 0){

1640

ret = close(tcp_sd);

1468

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

1641

1469

}

1642

1470

if(ret == -1){

1643

1471

if(e == 0){

1655

1483

return retval;

1656

1484

}

1657

1485

1486

__attribute__((nonnull))

1658

1487

static void resolve_callback(AvahiSServiceResolver *r,

1659

1488

AvahiIfIndex interface,

1660

1489

AvahiProtocol proto,

1797

1626

__attribute__((nonnull, warn_unused_result))

1798

1627

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

1799

1628

int ret;

1800

int old_errno;

1629

error_t ret_errno;

1801

1630

1802

1631

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

1803

1632

if(s < 0){

1804

old_errno = errno;

1633

ret_errno = errno;

1805

1634

perror_plus("socket");

1806

errno = old_errno;

1635

errno = ret_errno;

1807

1636

return false;

1808

1637

}

1809

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1810

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1638

strcpy(ifr->ifr_name, ifname);

1811

1639

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1812

1640

if(ret == -1){

1813

1641

if(debug){

1814

old_errno = errno;

1642

ret_errno = errno;

1815

1643

perror_plus("ioctl SIOCGIFFLAGS");

1816

errno = old_errno;

1817

}

1818

if((close(s) == -1) and debug){

1819

old_errno = errno;

1820

perror_plus("close");

1821

errno = old_errno;

1644

errno = ret_errno;

1822

1645

}

1823

1646

return false;

1824

1647

}

1825

if((close(s) == -1) and debug){

1826

old_errno = errno;

1827

perror_plus("close");

1828

errno = old_errno;

1829

}

1830

1648

return true;

1831

1649

}

1832

1650

2093

1911

return;

2094

1912

}

2095

1913

}

2096

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

2097

if(devnull == -1){

2098

perror_plus("open(\"/dev/null\", O_RDONLY)");

2099

return;

2100

}

1914

#ifdef __GLIBC__

1915

#if __GLIBC_PREREQ(2, 15)

2101

1916

int numhooks = scandirat(hookdir_fd, ".", &direntries,

2102

1917

runnable_hook, alphasort);

1918

#else /* not __GLIBC_PREREQ(2, 15) */

1919

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

1920

alphasort);

1921

#endif /* not __GLIBC_PREREQ(2, 15) */

1922

#else /* not __GLIBC__ */

1923

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

1924

alphasort);

1925

#endif /* not __GLIBC__ */

2103

1926

if(numhooks == -1){

2104

1927

perror_plus("scandir");

2105

close(devnull);

2106

1928

return;

2107

1929

}

2108

1930

struct dirent *direntry;

2109

1931

int ret;

1932

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

1933

if(devnull == -1){

1934

perror_plus("open(\"/dev/null\", O_RDONLY)");

1935

return;

1936

}

2110

1937

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

2111

1938

direntry = direntries[i];

2112

1939

if(debug){

2183

2010

perror_plus("openat");

2184

2011

_exit(EXIT_FAILURE);

2185

2012

}

2186

if(close(hookdir_fd) == -1){

2013

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

2187

2014

perror_plus("close");

2188

2015

_exit(EXIT_FAILURE);

2189

2016

}

2192

2019

perror_plus("dup2(devnull, STDIN_FILENO)");

2193

2020

_exit(EX_OSERR);

2194

2021

}

2195

ret = close(devnull);

2022

ret = (int)TEMP_FAILURE_RETRY(close(devnull));

2196

2023

if(ret == -1){

2197

2024

perror_plus("close");

2198

2025

_exit(EX_OSERR);

2247

2074

free(direntry);

2248

2075

}

2249

2076

free(direntries);

2250

if(close(hookdir_fd) == -1){

2077

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

2251

2078

perror_plus("close");

2252

2079

} else {

2253

2080

hookdir_fd = -1;

2256

2083

}

2257

2084

2258

2085

__attribute__((nonnull, warn_unused_result))

2259

int bring_up_interface(const char *const interface,

2260

const float delay){

2261

int old_errno = errno;

2086

error_t bring_up_interface(const char *const interface,

2087

const float delay){

2088

error_t old_errno = errno;

2262

2089

int ret;

2263

2090

struct ifreq network;

2264

2091

unsigned int if_index = if_nametoindex(interface);

2274

2101

}

2275

2102

2276

2103

if(not interface_is_up(interface)){

2277

int ret_errno = 0;

2278

int ioctl_errno = 0;

2104

error_t ret_errno = 0, ioctl_errno = 0;

2279

2105

if(not get_flags(interface, &network)){

2280

2106

ret_errno = errno;

2281

2107

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

2294

2120

}

2295

2121

2296

2122

if(quit_now){

2297

ret = close(sd);

2123

ret = (int)TEMP_FAILURE_RETRY(close(sd));

2298

2124

if(ret == -1){

2299

2125

perror_plus("close");

2300

2126

}

2350

2176

}

2351

2177

2352

2178

/* Close the socket */

2353

ret = close(sd);

2179

ret = (int)TEMP_FAILURE_RETRY(close(sd));

2354

2180

if(ret == -1){

2355

2181

perror_plus("close");

2356

2182

}

2368

2194

2369

2195

/* Sleep checking until interface is running.

2370

2196

Check every 0.25s, up to total time of delay */

2371

for(int i = 0; i < delay * 4; i++){

2197

for(int i=0; i < delay * 4; i++){

2372

2198

if(interface_is_running(interface)){

2373

2199

break;

2374

2200

}

2384

2210

}

2385

2211

2386

2212

__attribute__((nonnull, warn_unused_result))

2387

int take_down_interface(const char *const interface){

2388

int old_errno = errno;

2213

error_t take_down_interface(const char *const interface){

2214

error_t old_errno = errno;

2389

2215

struct ifreq network;

2390

2216

unsigned int if_index = if_nametoindex(interface);

2391

2217

if(if_index == 0){

2394

2220

return ENXIO;

2395

2221

}

2396

2222

if(interface_is_up(interface)){

2397

int ret_errno = 0;

2398

int ioctl_errno = 0;

2223

error_t ret_errno = 0, ioctl_errno = 0;

2399

2224

if(not get_flags(interface, &network) and debug){

2400

2225

ret_errno = errno;

2401

2226

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

2439

2264

}

2440

2265

2441

2266

/* Close the socket */

2442

int ret = close(sd);

2267

int ret = (int)TEMP_FAILURE_RETRY(close(sd));

2443

2268

if(ret == -1){

2444

2269

perror_plus("close");

2445

2270

}

2461

2286

2462

2287

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

2463

2288

mandos_context mc = { .server = NULL, .dh_bits = 0,

2464

#if GNUTLS_VERSION_NUMBER >= 0x030606

2465

.priority = "SECURE128:!CTYPE-X.509"

2466

":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"

2467

":%PROFILE_ULTRA",

2468

#elif GNUTLS_VERSION_NUMBER < 0x030600

2469

.priority = "SECURE256:!CTYPE-X.509"

2470

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2471

#else

2472

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

2473

#endif

2474

.current_server = NULL, .interfaces = NULL,

2475

.interfaces_size = 0 };

2289

.priority = "SECURE256:!CTYPE-X.509:"

2290

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

2291

.interfaces = NULL, .interfaces_size = 0 };

2476

2292

AvahiSServiceBrowser *sb = NULL;

2477

2293

error_t ret_errno;

2478

2294

int ret;

2487

2303

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2488

2304

const char *seckey = PATHDIR "/" SECKEY;

2489

2305

const char *pubkey = PATHDIR "/" PUBKEY;

2490

#if GNUTLS_VERSION_NUMBER >= 0x030606

2491

const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;

2492

const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;

2493

#endif

2494

2306

const char *dh_params_file = NULL;

2495

2307

char *interfaces_hooks = NULL;

2496

2308

2544

2356

{ .name = "pubkey", .key = 'p',

2545

2357

.arg = "FILE",

2546

2358

.doc = "OpenPGP public key file base name",

2547

.group = 1 },

2548

{ .name = "tls-privkey", .key = 't',

2549

.arg = "FILE",

2550

#if GNUTLS_VERSION_NUMBER >= 0x030606

2551

.doc = "TLS private key file base name",

2552

#else

2553

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2554

#endif

2555

.group = 1 },

2556

{ .name = "tls-pubkey", .key = 'T',

2557

.arg = "FILE",

2558

#if GNUTLS_VERSION_NUMBER >= 0x030606

2559

.doc = "TLS public key file base name",

2560

#else

2561

.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",

2562

#endif

2563

.group = 1 },

2359

.group = 2 },

2564

2360

{ .name = "dh-bits", .key = 129,

2565

2361

.arg = "BITS",

2566

2362

.doc = "Bit length of the prime number used in the"

2622

2418

case 'p': /* --pubkey */

2623

2419

pubkey = arg;

2624

2420

break;

2625

case 't': /* --tls-privkey */

2626

#if GNUTLS_VERSION_NUMBER >= 0x030606

2627

tls_privkey = arg;

2628

#endif

2629

break;

2630

case 'T': /* --tls-pubkey */

2631

#if GNUTLS_VERSION_NUMBER >= 0x030606

2632

tls_pubkey = arg;

2633

#endif

2634

break;

2635

2421

case 129: /* --dh-bits */

2636

2422

errno = 0;

2637

2423

tmpmax = strtoimax(arg, &tmp, 10);

2672

2458

argp_state_help(state, state->out_stream,

2673

2459

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

2674

2460

& ~(unsigned int)ARGP_HELP_EXIT_OK);

2675

__builtin_unreachable();

2676

2461

case -3: /* --usage */

2677

2462

argp_state_help(state, state->out_stream,

2678

2463

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2679

__builtin_unreachable();

2680

2464

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

2681

2465

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

2682

2466

exit(argp_err_exit_status);

2691

2475

.args_doc = "",

2692

2476

.doc = "Mandos client -- Get and decrypt"

2693

2477

" passwords from a Mandos server" };

2694

ret_errno = argp_parse(&argp, argc, argv,

2695

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2696

switch(ret_errno){

2478

ret = argp_parse(&argp, argc, argv,

2479

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2480

switch(ret){

2697

2481

case 0:

2698

2482

break;

2699

2483

case ENOMEM:

2700

2484

default:

2701

errno = ret_errno;

2485

errno = ret;

2702

2486

perror_plus("argp_parse");

2703

2487

exitcode = EX_OSERR;

2704

2488

goto end;

2710

2494

2711

2495

{

2712

2496

/* Work around Debian bug #633582:

2713

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

2497

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

2714

2498

2715

2499

/* Re-raise privileges */

2716

ret = raise_privileges();

2717

if(ret != 0){

2718

errno = ret;

2500

ret_errno = raise_privileges();

2501

if(ret_errno != 0){

2502

errno = ret_errno;

2719

2503

perror_plus("Failed to raise privileges");

2720

2504

} else {

2721

2505

struct stat st;

2737

2521

}

2738

2522

}

2739

2523

}

2740

close(seckey_fd);

2524

TEMP_FAILURE_RETRY(close(seckey_fd));

2741

2525

}

2742

2526

}

2743

2527

2758

2542

}

2759

2543

}

2760

2544

}

2761

close(pubkey_fd);

2545

TEMP_FAILURE_RETRY(close(pubkey_fd));

2762

2546

}

2763

2547

}

2764

2548

2765

if(dh_params_file != NULL

2766

and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2549

if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2767

2550

int dhparams_fd = open(dh_params_file, O_RDONLY);

2768

2551

if(dhparams_fd == -1){

2769

2552

perror_plus("open");

2780

2563

}

2781

2564

}

2782

2565

}

2783

close(dhparams_fd);

2566

TEMP_FAILURE_RETRY(close(dhparams_fd));

2784

2567

}

2785

2568

}

2786

2569

2787

2570

/* Lower privileges */

2788

ret = lower_privileges();

2789

if(ret != 0){

2790

errno = ret;

2571

ret_errno = lower_privileges();

2572

if(ret_errno != 0){

2573

errno = ret_errno;

2791

2574

perror_plus("Failed to lower privileges");

2792

2575

}

2793

2576

}

2993

2776

goto end;

2994

2777

}

2995

2778

2996

#if GNUTLS_VERSION_NUMBER >= 0x030606

2997

ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);

2998

#elif GNUTLS_VERSION_NUMBER < 0x030600

2999

2779

ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);

3000

#else

3001

#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"

3002

#endif

3003

2780

if(ret == -1){

3004

2781

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

3005

2782

exitcode = EX_UNAVAILABLE;

3127

2904

3128

2905

/* Allocate a new server */

3129

2906

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3130

&config, NULL, NULL, &ret);

2907

&config, NULL, NULL, &ret_errno);

3131

2908

3132

2909

/* Free the Avahi configuration data */

3133

2910

avahi_server_config_free(&config);

3136

2913

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

3137

2914

if(mc.server == NULL){

3138

2915

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

3139

avahi_strerror(ret));

2916

avahi_strerror(ret_errno));

3140

2917

exitcode = EX_UNAVAILABLE;

3141

2918

goto end;

3142

2919

}

3177

2954

end:

3178

2955

3179

2956

if(debug){

3180

if(signal_received){

3181

fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",

3182

argv[0], signal_received,

3183

strsignal(signal_received));

3184

} else {

3185

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

3186

}

2957

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

3187

2958

}

3188

2959

3189

2960

/* Cleanup things */

3200

2971

3201

2972

if(gnutls_initialized){

3202

2973

gnutls_certificate_free_credentials(mc.cred);

2974

gnutls_global_deinit();

3203

2975

gnutls_dh_params_deinit(mc.dh_params);

3204

2976

}

3205

2977

3228

3000

3229

3001

/* Re-raise privileges */

3230

3002

{

3231

ret = raise_privileges();

3232

if(ret != 0){

3233

errno = ret;

3003

ret_errno = raise_privileges();

3004

if(ret_errno != 0){

3005

errno = ret_errno;

3234

3006

perror_plus("Failed to raise privileges");

3235

3007

} else {

3236

3008

3241

3013

/* Take down the network interfaces which were brought up */

3242

3014

{

3243

3015

char *interface = NULL;

3244

while((interface = argz_next(interfaces_to_take_down,

3245

interfaces_to_take_down_size,

3246

interface))){

3247

ret = take_down_interface(interface);

3248

if(ret != 0){

3249

errno = ret;

3016

while((interface=argz_next(interfaces_to_take_down,

3017

interfaces_to_take_down_size,

3018

interface))){

3019

ret_errno = take_down_interface(interface);

3020

if(ret_errno != 0){

3021

errno = ret_errno;

3250

3022

perror_plus("Failed to take down interface");

3251

3023

}

3252

3024

}

3257

3029

}

3258

3030

}

3259

3031

3260

ret = lower_privileges_permanently();

3261

if(ret != 0){

3262

errno = ret;

3032

ret_errno = lower_privileges_permanently();

3033

if(ret_errno != 0){

3034

errno = ret_errno;

3263

3035

perror_plus("Failed to lower privileges permanently");

3264

3036

}

3265

3037

}

3267

3039

free(interfaces_to_take_down);

3268

3040

free(interfaces_hooks);

3269

3041

3270

void clean_dir_at(int base, const char * const dirname,

3271

uintmax_t level){

3272

struct dirent **direntries = NULL;

3273

int dret;

3274

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3275

O_RDONLY

3276

| O_NOFOLLOW

3277

| O_DIRECTORY

3278

| O_PATH));

3279

if(dir_fd == -1){

3280

perror_plus("open");

3281

return;

3282

}

3283

int numentries = scandirat(dir_fd, ".", &direntries,

3284

notdotentries, alphasort);

3285

if(numentries >= 0){

3286

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

3287

if(debug){

3288

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3289

dirname, direntries[i]->d_name);

3290

}

3291

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3292

if(dret == -1){

3293

if(errno == EISDIR){

3294

dret = unlinkat(dir_fd, direntries[i]->d_name,

3295

AT_REMOVEDIR);

3296

}

3297

if((dret == -1) and (errno == ENOTEMPTY)

3298

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3299

== 0) and (level == 0)){

3300

/* Recurse only in this special case */

3301

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3302

dret = 0;

3303

}

3304

if((dret == -1) and (errno != ENOENT)){

3305

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3306

direntries[i]->d_name, strerror(errno));

3307

}

3308

}

3309

free(direntries[i]);

3310

}

3311

3312

/* need to clean even if 0 because man page doesn't specify */

3313

free(direntries);

3314

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3315

if(dret == -1 and errno != ENOENT){

3316

perror_plus("rmdir");

3317

}

3318

} else {

3319

perror_plus("scandirat");

3320

}

3321

close(dir_fd);

3322

}

3323

3324

3042

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

3325

3043

if(tempdir != NULL){

3326

clean_dir_at(-1, tempdir, 0);

3044

struct dirent **direntries = NULL;

3045

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY

3046

| O_NOFOLLOW

3047

| O_DIRECTORY

3048

| O_PATH));

3049

if(tempdir_fd == -1){

3050

perror_plus("open");

3051

} else {

3052

#ifdef __GLIBC__

3053

#if __GLIBC_PREREQ(2, 15)

3054

int numentries = scandirat(tempdir_fd, ".", &direntries,

3055

notdotentries, alphasort);

3056

#else /* not __GLIBC_PREREQ(2, 15) */

3057

int numentries = scandir(tempdir, &direntries, notdotentries,

3058

alphasort);

3059

#endif /* not __GLIBC_PREREQ(2, 15) */

3060

#else /* not __GLIBC__ */

3061

int numentries = scandir(tempdir, &direntries, notdotentries,

3062

alphasort);

3063

#endif /* not __GLIBC__ */

3064

if(numentries >= 0){

3065

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

3066

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

3067

if(ret == -1){

3068

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

3069

" \"%s\", 0): %s\n", tempdir,

3070

direntries[i]->d_name, strerror(errno));

3071

}

3072

free(direntries[i]);

3073

}

3074

3075

/* need to clean even if 0 because man page doesn't specify */

3076

free(direntries);

3077

if(numentries == -1){

3078

perror_plus("scandir");

3079

}

3080

ret = rmdir(tempdir);

3081

if(ret == -1 and errno != ENOENT){

3082

perror_plus("rmdir");

3083

}

3084

}

3085

TEMP_FAILURE_RETRY(close(tempdir_fd));

3086

}

3327

3087

}

3328

3088

3329

3089

if(quit_now){