/mandos/release : revision 237.7.291

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

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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

*

27

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>.

31

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

const char *dhparamsfilename,

708

519

mandos_context *mc){

709

520

int ret;

521

unsigned int uret;

710

522

711

523

if(debug){

712

524

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

713

525

}

714

526

527

ret = gnutls_global_init();

528

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

531

return -1;

532

}

533

715

534

if(debug){

716

535

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

717

536

* - GnuTLS manual

725

544

if(ret != GNUTLS_E_SUCCESS){

726

545

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

727

546

safer_gnutls_strerror(ret));

547

gnutls_global_deinit();

728

548

return -1;

729

549

}

730

550

731

551

if(debug){

732

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

733

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

552

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

553

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

734

554

pubkeyfilename,

735

555

seckeyfilename);

736

556

}

737

557

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

558

ret = gnutls_certificate_set_openpgp_key_file

752

559

(mc->cred, pubkeyfilename, seckeyfilename,

753

560

GNUTLS_OPENPGP_FMT_BASE64);

754

#else

755

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

756

#endif

757

561

if(ret != GNUTLS_E_SUCCESS){

758

562

fprintf_plus(stderr,

759

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

563

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

760

564

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

761

565

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

762

566

safer_gnutls_strerror(ret));

771

575

safer_gnutls_strerror(ret));

772

576

goto globalfail;

773

577

}

774

/* If a Diffie-Hellman parameters file was given, try to use it */

775

if(dhparamsfilename != NULL){

776

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

777

do {

778

int dhpfile = open(dhparamsfilename, O_RDONLY);

779

if(dhpfile == -1){

780

perror_plus("open");

781

dhparamsfilename = NULL;

782

break;

783

}

784

size_t params_capacity = 0;

578

if(mc->dh_bits == 0){

579

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

580

/* Try to read the private key file */

581

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

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

785

585

while(true){

786

params_capacity = incbuffer((char **)&params.data,

787

(size_t)params.size,

788

(size_t)params_capacity);

789

if(params_capacity == 0){

586

buffer_capacity = incbuffer((char **)&buffer.data,

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

790

590

perror_plus("incbuffer");

791

free(params.data);

792

params.data = NULL;

793

dhparamsfilename = NULL;

591

free(buffer.data);

592

buffer.data = NULL;

794

593

break;

795

594

}

796

ssize_t bytes_read = read(dhpfile,

797

params.data + params.size,

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

798

596

BUFFER_SIZE);

799

597

/* EOF */

800

598

if(bytes_read == 0){

803

601

/* check bytes_read for failure */

804

602

if(bytes_read < 0){

805

603

perror_plus("read");

806

free(params.data);

807

params.data = NULL;

808

dhparamsfilename = NULL;

809

break;

810

}

811

params.size += (unsigned int)bytes_read;

812

}

813

ret = close(dhpfile);

814

if(ret == -1){

815

perror_plus("close");

816

}

817

if(params.data == NULL){

818

dhparamsfilename = NULL;

819

}

820

if(dhparamsfilename == NULL){

821

break;

822

}

823

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

824

GNUTLS_X509_FMT_PEM);

825

if(ret != GNUTLS_E_SUCCESS){

826

fprintf_plus(stderr, "Failed to parse DH parameters in file"

827

" \"%s\": %s\n", dhparamsfilename,

828

safer_gnutls_strerror(ret));

829

dhparamsfilename = NULL;

830

}

831

free(params.data);

832

} while(false);

833

}

834

if(dhparamsfilename == NULL){

835

if(mc->dh_bits == 0){

836

#if GNUTLS_VERSION_NUMBER < 0x030600

837

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

838

/* Try to read the private key file */

839

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

840

do {

841

int secfile = open(seckeyfilename, O_RDONLY);

842

if(secfile == -1){

843

perror_plus("open");

844

break;

845

}

846

size_t buffer_capacity = 0;

847

while(true){

848

buffer_capacity = incbuffer((char **)&buffer.data,

849

(size_t)buffer.size,

850

(size_t)buffer_capacity);

851

if(buffer_capacity == 0){

852

perror_plus("incbuffer");

853

free(buffer.data);

854

buffer.data = NULL;

855

break;

856

}

857

ssize_t bytes_read = read(secfile,

858

buffer.data + buffer.size,

859

BUFFER_SIZE);

860

/* EOF */

861

if(bytes_read == 0){

862

break;

863

}

864

/* check bytes_read for failure */

865

if(bytes_read < 0){

866

perror_plus("read");

867

free(buffer.data);

868

buffer.data = NULL;

869

break;

870

}

871

buffer.size += (unsigned int)bytes_read;

872

}

873

close(secfile);

874

} while(false);

875

/* If successful, use buffer to parse private key */

876

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

877

if(buffer.data != NULL){

878

{

879

gnutls_openpgp_privkey_t privkey = NULL;

880

ret = gnutls_openpgp_privkey_init(&privkey);

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

/* If successful, use buffer to parse private key */

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

881

627

if(ret != GNUTLS_E_SUCCESS){

882

fprintf_plus(stderr, "Error initializing OpenPGP key"

883

" structure: %s",

628

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

884

629

safer_gnutls_strerror(ret));

885

free(buffer.data);

886

buffer.data = NULL;

887

} else {

888

ret = gnutls_openpgp_privkey_import

889

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

890

if(ret != GNUTLS_E_SUCCESS){

891

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

892

safer_gnutls_strerror(ret));

893

privkey = NULL;

894

}

895

free(buffer.data);

896

buffer.data = NULL;

897

if(privkey != NULL){

898

/* Use private key to suggest an appropriate

899

sec_param */

900

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

901

gnutls_openpgp_privkey_deinit(privkey);

902

if(debug){

903

fprintf_plus(stderr, "This OpenPGP key implies using"

904

" a GnuTLS security parameter \"%s\".\n",

905

safe_string(gnutls_sec_param_get_name

906

(sec_param)));

907

}

908

}

630

privkey = NULL;

909

631

}

910

}

911

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

912

/* Err on the side of caution */

913

sec_param = GNUTLS_SEC_PARAM_ULTRA;

914

if(debug){

915

fprintf_plus(stderr, "Falling back to security parameter"

916

" \"%s\"\n",

917

safe_string(gnutls_sec_param_get_name

918

(sec_param)));

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

" GnuTLS security parameter \"%s\".\n",

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

919

644

}

920

645

}

921

646

}

922

unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

923

if(uret != 0){

924

mc->dh_bits = uret;

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

925

650

if(debug){

926

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

927

" implies %u DH bits; using that.\n",

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

928

653

safe_string(gnutls_sec_param_get_name

929

(sec_param)),

930

mc->dh_bits);

654

(sec_param)));

931

655

}

932

} else {

933

fprintf_plus(stderr, "Failed to get implied number of DH"

934

" bits for security parameter \"%s\"): %s\n",

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

663

" implies %u DH bits; using that.\n",

935

664

safe_string(gnutls_sec_param_get_name

936

665

(sec_param)),

937

safer_gnutls_strerror(ret));

938

goto globalfail;

939

}

940

#endif

941

} else { /* dh_bits != 0 */

942

if(debug){

943

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

944

666

mc->dh_bits);

945

667

}

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);

668

} else {

669

fprintf_plus(stderr, "Failed to get implied number of DH"

670

" bits for security parameter \"%s\"): %s\n",

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

954

674

}

955

}

675

} else if(debug){

676

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

677

mc->dh_bits);

678

}

679

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

680

if(ret != GNUTLS_E_SUCCESS){

681

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

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

683

goto globalfail;

684

}

685

686

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

956

687

957

688

return 0;

958

689

959

690

globalfail:

960

691

961

692

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

962

694

gnutls_dh_params_deinit(mc->dh_params);

963

695

return -1;

964

696

}

969

701

int ret;

970

702

/* GnuTLS session creation */

971

703

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

));

704

ret = gnutls_init(session, GNUTLS_SERVER);

980

705

if(quit_now){

981

706

return -1;

982

707

}

1023

748

/* ignore client certificate if any. */

1024

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

1025

750

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

1026

753

return 0;

1027

754

}

1028

755

1030

757

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

1031

758

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

1032

759

1033

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

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool add_delete_local_route(const bool add,

1036

const char *address,

1037

AvahiIfIndex if_index){

1038

int ret;

1039

char helper[] = "mandos-client-iprouteadddel";

1040

char add_arg[] = "add";

1041

char delete_arg[] = "delete";

1042

char debug_flag[] = "--debug";

1043

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

1044

if(pluginhelperdir == NULL){

1045

if(debug){

1046

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

1047

" variable not set; cannot run helper\n");

1048

}

1049

return false;

1050

}

1051

1052

char interface[IF_NAMESIZE];

1053

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

1054

perror_plus("if_indextoname");

1055

return false;

1056

}

1057

1058

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

1059

if(devnull == -1){

1060

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

1061

return false;

1062

}

1063

pid_t pid = fork();

1064

if(pid == 0){

1065

/* Child */

1066

/* Raise privileges */

1067

errno = raise_privileges_permanently();

1068

if(errno != 0){

1069

perror_plus("Failed to raise privileges");

1070

/* _exit(EX_NOPERM); */

1071

} else {

1072

/* Set group */

1073

errno = 0;

1074

ret = setgid(0);

1075

if(ret == -1){

1076

perror_plus("setgid");

1077

_exit(EX_NOPERM);

1078

}

1079

/* Reset supplementary groups */

1080

errno = 0;

1081

ret = setgroups(0, NULL);

1082

if(ret == -1){

1083

perror_plus("setgroups");

1084

_exit(EX_NOPERM);

1085

}

1086

}

1087

ret = dup2(devnull, STDIN_FILENO);

1088

if(ret == -1){

1089

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

1090

_exit(EX_OSERR);

1091

}

1092

ret = close(devnull);

1093

if(ret == -1){

1094

perror_plus("close");

1095

_exit(EX_OSERR);

1096

}

1097

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1098

if(ret == -1){

1099

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1100

_exit(EX_OSERR);

1101

}

1102

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

1103

O_RDONLY

1104

| O_DIRECTORY

1105

| O_PATH

1106

| O_CLOEXEC));

1107

if(helperdir_fd == -1){

1108

perror_plus("open");

1109

_exit(EX_UNAVAILABLE);

1110

}

1111

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

1112

helper, O_RDONLY));

1113

if(helper_fd == -1){

1114

perror_plus("openat");

1115

close(helperdir_fd);

1116

_exit(EX_UNAVAILABLE);

1117

}

1118

close(helperdir_fd);

1119

#ifdef __GNUC__

1120

#pragma GCC diagnostic push

1121

#pragma GCC diagnostic ignored "-Wcast-qual"

1122

#endif

1123

if(fexecve(helper_fd, (char *const [])

1124

{ helper, add ? add_arg : delete_arg, (char *)address,

1125

interface, debug ? debug_flag : NULL, NULL },

1126

environ) == -1){

1127

#ifdef __GNUC__

1128

#pragma GCC diagnostic pop

1129

#endif

1130

perror_plus("fexecve");

1131

_exit(EXIT_FAILURE);

1132

}

1133

}

1134

if(pid == -1){

1135

perror_plus("fork");

1136

return false;

1137

}

1138

int status;

1139

pid_t pret = -1;

1140

errno = 0;

1141

do {

1142

pret = waitpid(pid, &status, 0);

1143

if(pret == -1 and errno == EINTR and quit_now){

1144

int errno_raising = 0;

1145

if((errno = raise_privileges()) != 0){

1146

errno_raising = errno;

1147

perror_plus("Failed to raise privileges in order to"

1148

" kill helper program");

1149

}

1150

if(kill(pid, SIGTERM) == -1){

1151

perror_plus("kill");

1152

}

1153

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

1154

perror_plus("Failed to lower privileges after killing"

1155

" helper program");

1156

}

1157

return false;

1158

}

1159

} while(pret == -1 and errno == EINTR);

1160

if(pret == -1){

1161

perror_plus("waitpid");

1162

return false;

1163

}

1164

if(WIFEXITED(status)){

1165

if(WEXITSTATUS(status) != 0){

1166

fprintf_plus(stderr, "Error: iprouteadddel exited"

1167

" with status %d\n", WEXITSTATUS(status));

1168

return false;

1169

}

1170

return true;

1171

}

1172

if(WIFSIGNALED(status)){

1173

fprintf_plus(stderr, "Error: iprouteadddel died by"

1174

" signal %d\n", WTERMSIG(status));

1175

return false;

1176

}

1177

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

1178

return false;

1179

}

1180

1181

__attribute__((nonnull, warn_unused_result))

1182

static bool add_local_route(const char *address,

1183

AvahiIfIndex if_index){

1184

if(debug){

1185

fprintf_plus(stderr, "Adding route to %s\n", address);

1186

}

1187

return add_delete_local_route(true, address, if_index);

1188

}

1189

1190

__attribute__((nonnull, warn_unused_result))

1191

static bool delete_local_route(const char *address,

1192

AvahiIfIndex if_index){

1193

if(debug){

1194

fprintf_plus(stderr, "Removing route to %s\n", address);

1195

}

1196

return add_delete_local_route(false, address, if_index);

1197

}

1198

1199

760

/* Called when a Mandos server is found */

1200

761

__attribute__((nonnull, warn_unused_result))

1201

762

static int start_mandos_communication(const char *ip, in_port_t port,

1212

773

int retval = -1;

1213

774

gnutls_session_t session;

1214

775

int pf; /* Protocol family */

1215

bool route_added = false;

1216

776

1217

777

errno = 0;

1218

778

1240

800

bool match = false;

1241

801

{

1242

802

char *interface = NULL;

1243

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

1244

mc->interfaces_size,

1245

interface))){

803

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

804

interface))){

1246

805

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

1247

806

match = true;

1248

807

break;

1277

836

PRIuMAX "\n", ip, (uintmax_t)port);

1278

837

}

1279

838

1280

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

839

tcp_sd = socket(pf, SOCK_STREAM, 0);

1281

840

if(tcp_sd < 0){

1282

841

int e = errno;

1283

842

perror_plus("socket");

1290

849

goto mandos_end;

1291

850

}

1292

851

852

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

1293

853

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);

854

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

855

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

1297

856

} 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);

857

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

858

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

1301

859

}

1302

860

if(ret < 0 ){

1303

861

int e = errno;

1373

931

goto mandos_end;

1374

932

}

1375

933

1376

while(true){

1377

if(af == AF_INET6){

1378

ret = connect(tcp_sd, (struct sockaddr *)&to,

1379

sizeof(struct sockaddr_in6));

1380

} else {

1381

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

1382

sizeof(struct sockaddr_in));

1383

}

1384

if(ret < 0){

1385

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

1386

and if_index != AVAHI_IF_UNSPEC

1387

and connect_to == NULL

1388

and not route_added and

1389

((af == AF_INET6 and not

1390

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1391

&to)->sin6_addr)))

1392

or (af == AF_INET and

1393

/* Not a a IPv4LL address */

1394

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1395

& 0xFFFF0000L) != 0xA9FE0000L))){

1396

/* Work around Avahi bug - Avahi does not announce link-local

1397

addresses if it has a global address, so local hosts with

1398

*only* a link-local address (e.g. Mandos clients) cannot

1399

connect to a Mandos server announced by Avahi on a server

1400

host with a global address. Work around this by retrying

1401

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

1402

1403

Avahi bug reference:

1404

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

1405

https://bugs.debian.org/587961

1406

*/

1407

if(debug){

1408

fprintf_plus(stderr, "Mandos server unreachable, trying"

1409

" direct route\n");

1410

}

1411

int e = errno;

1412

route_added = add_local_route(ip, if_index);

1413

if(route_added){

1414

continue;

1415

}

1416

errno = e;

1417

}

1418

if(errno != ECONNREFUSED or debug){

1419

int e = errno;

1420

perror_plus("connect");

1421

errno = e;

1422

}

1423

goto mandos_end;

1424

}

1425

1426

if(quit_now){

1427

errno = EINTR;

1428

goto mandos_end;

1429

}

1430

break;

934

if(af == AF_INET6){

935

ret = connect(tcp_sd, (struct sockaddr *)&to,

936

sizeof(struct sockaddr_in6));

937

} else {

938

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

939

sizeof(struct sockaddr_in));

940

}

941

if(ret < 0){

942

if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

943

int e = errno;

944

perror_plus("connect");

945

errno = e;

946

}

947

goto mandos_end;

948

}

949

950

if(quit_now){

951

errno = EINTR;

952

goto mandos_end;

1431

953

}

1432

954

1433

955

const char *out = mandos_protocol_version;

1587

1109

&decrypted_buffer, mc);

1588

1110

if(decrypted_buffer_size >= 0){

1589

1111

1590

clearerr(stdout);

1591

1112

written = 0;

1592

1113

while(written < (size_t) decrypted_buffer_size){

1593

1114

if(quit_now){

1609

1130

}

1610

1131

written += (size_t)ret;

1611

1132

}

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

1133

retval = 0;

1623

1134

}

1624

1135

}

1627

1138

1628

1139

mandos_end:

1629

1140

{

1630

if(route_added){

1631

if(not delete_local_route(ip, if_index)){

1632

fprintf_plus(stderr, "Failed to delete local route to %s on"

1633

" interface %d", ip, if_index);

1634

}

1635

}

1636

1141

int e = errno;

1637

1142

free(decrypted_buffer);

1638

1143

free(buffer);

1639

1144

if(tcp_sd >= 0){

1640

ret = close(tcp_sd);

1145

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

1641

1146

}

1642

1147

if(ret == -1){

1643

1148

if(e == 0){

1655

1160

return retval;

1656

1161

}

1657

1162

1163

__attribute__((nonnull))

1658

1164

static void resolve_callback(AvahiSServiceResolver *r,

1659

1165

AvahiIfIndex interface,

1660

1166

AvahiProtocol proto,

1797

1303

__attribute__((nonnull, warn_unused_result))

1798

1304

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

1799

1305

int ret;

1800

int old_errno;

1306

error_t ret_errno;

1801

1307

1802

1308

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

1803

1309

if(s < 0){

1804

old_errno = errno;

1310

ret_errno = errno;

1805

1311

perror_plus("socket");

1806

errno = old_errno;

1312

errno = ret_errno;

1807

1313

return false;

1808

1314

}

1809

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

1810

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

1315

strcpy(ifr->ifr_name, ifname);

1811

1316

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1812

1317

if(ret == -1){

1813

1318

if(debug){

1814

old_errno = errno;

1319

ret_errno = errno;

1815

1320

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;

1321

errno = ret_errno;

1822

1322

}

1823

1323

return false;

1824

1324

}

1825

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

1826

old_errno = errno;

1827

perror_plus("close");

1828

errno = old_errno;

1829

}

1830

1325

return true;

1831

1326

}

1832

1327

2074

1569

}

2075

1570

}

2076

1571

1572

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

1573

__attribute__((warn_unused_result))

1574

error_t raise_privileges(void){

1575

error_t old_errno = errno;

1576

error_t ret_errno = 0;

1577

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

1578

ret_errno = errno;

1579

}

1580

errno = old_errno;

1581

return ret_errno;

1582

}

1583

1584

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

1585

__attribute__((warn_unused_result))

1586

error_t raise_privileges_permanently(void){

1587

error_t old_errno = errno;

1588

error_t ret_errno = raise_privileges();

1589

if(ret_errno != 0){

1590

errno = old_errno;

1591

return ret_errno;

1592

}

1593

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

1594

ret_errno = errno;

1595

}

1596

errno = old_errno;

1597

return ret_errno;

1598

}

1599

1600

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

1601

__attribute__((warn_unused_result))

1602

error_t lower_privileges(void){

1603

error_t old_errno = errno;

1604

error_t ret_errno = 0;

1605

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

1606

ret_errno = errno;

1607

}

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

1612

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1614

error_t lower_privileges_permanently(void){

1615

error_t old_errno = errno;

1616

error_t ret_errno = 0;

1617

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

1618

ret_errno = errno;

1619

}

1620

errno = old_errno;

1621

return ret_errno;

1622

}

1623

2077

1624

__attribute__((nonnull))

2078

1625

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

2079

1626

const float delay){

2080

1627

struct dirent **direntries = NULL;

2081

1628

if(hookdir_fd == -1){

2082

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2083

| O_CLOEXEC);

1629

hookdir_fd = open(hookdir, O_RDONLY);

2084

1630

if(hookdir_fd == -1){

2085

1631

if(errno == ENOENT){

2086

1632

if(debug){

2093

1639

return;

2094

1640

}

2095

1641

}

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

}

1642

#ifdef __GLIBC__

1643

#if __GLIBC_PREREQ(2, 15)

2101

1644

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

2102

1645

runnable_hook, alphasort);

1646

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

1647

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

1648

alphasort);

1649

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

1650

#else /* not __GLIBC__ */

1651

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

1652

alphasort);

1653

#endif /* not __GLIBC__ */

2103

1654

if(numhooks == -1){

2104

1655

perror_plus("scandir");

2105

close(devnull);

2106

1656

return;

2107

1657

}

2108

1658

struct dirent *direntry;

2109

1659

int ret;

1660

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

2110

1661

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

2111

1662

direntry = direntries[i];

2112

1663

if(debug){

2136

1687

perror_plus("setgroups");

2137

1688

_exit(EX_NOPERM);

2138

1689

}

1690

ret = dup2(devnull, STDIN_FILENO);

1691

if(ret == -1){

1692

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

1693

_exit(EX_OSERR);

1694

}

1695

ret = close(devnull);

1696

if(ret == -1){

1697

perror_plus("close");

1698

_exit(EX_OSERR);

1699

}

1700

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1701

if(ret == -1){

1702

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1703

_exit(EX_OSERR);

1704

}

2139

1705

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

2140

1706

if(ret == -1){

2141

1707

perror_plus("setenv");

2176

1742

_exit(EX_OSERR);

2177

1743

}

2178

1744

}

2179

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

2180

direntry->d_name,

2181

O_RDONLY));

1745

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

2182

1746

if(hook_fd == -1){

2183

1747

perror_plus("openat");

2184

1748

_exit(EXIT_FAILURE);

2185

1749

}

2186

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

1750

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

2187

1751

perror_plus("close");

2188

1752

_exit(EXIT_FAILURE);

2189

1753

}

2190

ret = dup2(devnull, STDIN_FILENO);

2191

if(ret == -1){

2192

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

2193

_exit(EX_OSERR);

2194

}

2195

ret = close(devnull);

2196

if(ret == -1){

2197

perror_plus("close");

2198

_exit(EX_OSERR);

2199

}

2200

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2201

if(ret == -1){

2202

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

2203

_exit(EX_OSERR);

2204

}

2205

1754

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

2206

1755

environ) == -1){

2207

1756

perror_plus("fexecve");

2247

1796

free(direntry);

2248

1797

}

2249

1798

free(direntries);

2250

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

1799

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

2251

1800

perror_plus("close");

2252

1801

} else {

2253

1802

hookdir_fd = -1;

2256

1805

}

2257

1806

2258

1807

__attribute__((nonnull, warn_unused_result))

2259

int bring_up_interface(const char *const interface,

2260

const float delay){

2261

int old_errno = errno;

1808

error_t bring_up_interface(const char *const interface,

1809

const float delay){

1810

error_t old_errno = errno;

2262

1811

int ret;

2263

1812

struct ifreq network;

2264

1813

unsigned int if_index = if_nametoindex(interface);

2274

1823

}

2275

1824

2276

1825

if(not interface_is_up(interface)){

2277

int ret_errno = 0;

2278

int ioctl_errno = 0;

1826

error_t ret_errno = 0, ioctl_errno = 0;

2279

1827

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

2280

1828

ret_errno = errno;

2281

1829

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

2294

1842

}

2295

1843

2296

1844

if(quit_now){

2297

ret = close(sd);

1845

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

2298

1846

if(ret == -1){

2299

1847

perror_plus("close");

2300

1848

}

2350

1898

}

2351

1899

2352

1900

/* Close the socket */

2353

ret = close(sd);

1901

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

2354

1902

if(ret == -1){

2355

1903

perror_plus("close");

2356

1904

}

2368

1916

2369

1917

/* Sleep checking until interface is running.

2370

1918

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

2371

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

1919

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

2372

1920

if(interface_is_running(interface)){

2373

1921

break;

2374

1922

}

2384

1932

}

2385

1933

2386

1934

__attribute__((nonnull, warn_unused_result))

2387

int take_down_interface(const char *const interface){

2388

int old_errno = errno;

1935

error_t take_down_interface(const char *const interface){

1936

error_t old_errno = errno;

2389

1937

struct ifreq network;

2390

1938

unsigned int if_index = if_nametoindex(interface);

2391

1939

if(if_index == 0){

2394

1942

return ENXIO;

2395

1943

}

2396

1944

if(interface_is_up(interface)){

2397

int ret_errno = 0;

2398

int ioctl_errno = 0;

1945

error_t ret_errno = 0, ioctl_errno = 0;

2399

1946

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

2400

1947

ret_errno = errno;

2401

1948

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

2439

1986

}

2440

1987

2441

1988

/* Close the socket */

2442

int ret = close(sd);

1989

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

2443

1990

if(ret == -1){

2444

1991

perror_plus("close");

2445

1992

}

2461

2008

2462

2009

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

2463

2010

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 };

2011

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

2012

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

2013

.interfaces = NULL, .interfaces_size = 0 };

2476

2014

AvahiSServiceBrowser *sb = NULL;

2477

2015

error_t ret_errno;

2478

2016

int ret;

2487

2025

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2488

2026

const char *seckey = PATHDIR "/" SECKEY;

2489

2027

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

const char *dh_params_file = NULL;

2495

2028

char *interfaces_hooks = NULL;

2496

2029

2497

2030

bool gnutls_initialized = false;

2544

2077

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

2545

2078

.arg = "FILE",

2546

2079

.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 },

2080

.group = 2 },

2564

2081

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

2565

2082

.arg = "BITS",

2566

2083

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

2567

2084

" Diffie-Hellman key exchange",

2568

2085

.group = 2 },

2569

{ .name = "dh-params", .key = 134,

2570

.arg = "FILE",

2571

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2572

" for the Diffie-Hellman key exchange",

2573

.group = 2 },

2574

2086

{ .name = "priority", .key = 130,

2575

2087

.arg = "STRING",

2576

2088

.doc = "GnuTLS priority string for the TLS handshake",

2622

2134

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

2623

2135

pubkey = arg;

2624

2136

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

2137

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

2636

2138

errno = 0;

2637

2139

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

2641

2143

}

2642

2144

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

2643

2145

break;

2644

case 134: /* --dh-params */

2645

dh_params_file = arg;

2646

break;

2647

2146

case 130: /* --priority */

2648

2147

mc.priority = arg;

2649

2148

break;

2672

2171

argp_state_help(state, state->out_stream,

2673

2172

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

2674

2173

& ~(unsigned int)ARGP_HELP_EXIT_OK);

2675

__builtin_unreachable();

2676

2174

case -3: /* --usage */

2677

2175

argp_state_help(state, state->out_stream,

2678

2176

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2679

__builtin_unreachable();

2680

2177

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

2681

2178

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

2682

2179

exit(argp_err_exit_status);

2691

2188

.args_doc = "",

2692

2189

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

2693

2190

" 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){

2191

ret = argp_parse(&argp, argc, argv,

2192

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2193

switch(ret){

2697

2194

case 0:

2698

2195

break;

2699

2196

case ENOMEM:

2700

2197

default:

2701

errno = ret_errno;

2198

errno = ret;

2702

2199

perror_plus("argp_parse");

2703

2200

exitcode = EX_OSERR;

2704

2201

goto end;

2707

2204

goto end;

2708

2205

}

2709

2206

}

2710

2207

2711

2208

{

2712

2209

/* Work around Debian bug #633582:

2713

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

2210

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

2714

2211

2715

2212

/* Re-raise privileges */

2716

ret = raise_privileges();

2717

if(ret != 0){

2718

errno = ret;

2213

ret_errno = raise_privileges();

2214

if(ret_errno != 0){

2215

errno = ret_errno;

2719

2216

perror_plus("Failed to raise privileges");

2720

2217

} else {

2721

2218

struct stat st;

2737

2234

}

2738

2235

}

2739

2236

}

2740

close(seckey_fd);

2237

TEMP_FAILURE_RETRY(close(seckey_fd));

2741

2238

}

2742

2239

}

2743

2240

2744

2241

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

2745

2242

int pubkey_fd = open(pubkey, O_RDONLY);

2746

2243

if(pubkey_fd == -1){

2758

2255

}

2759

2256

}

2760

2257

}

2761

close(pubkey_fd);

2762

}

2763

}

2764

2765

if(dh_params_file != NULL

2766

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

2767

int dhparams_fd = open(dh_params_file, O_RDONLY);

2768

if(dhparams_fd == -1){

2769

perror_plus("open");

2770

} else {

2771

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

2772

if(ret == -1){

2773

perror_plus("fstat");

2774

} else {

2775

if(S_ISREG(st.st_mode)

2776

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

2777

ret = fchown(dhparams_fd, uid, gid);

2778

if(ret == -1){

2779

perror_plus("fchown");

2780

}

2781

}

2782

}

2783

close(dhparams_fd);

2784

}

2785

}

2786

2258

TEMP_FAILURE_RETRY(close(pubkey_fd));

2259

}

2260

}

2261

2787

2262

/* Lower privileges */

2788

ret = lower_privileges();

2789

if(ret != 0){

2790

errno = ret;

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2791

2266

perror_plus("Failed to lower privileges");

2792

2267

}

2793

2268

}

2963

2438

errno = bring_up_interface(interface, delay);

2964

2439

if(not interface_was_up){

2965

2440

if(errno != 0){

2966

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2967

" %s\n", interface, strerror(errno));

2441

perror_plus("Failed to bring up interface");

2968

2442

} else {

2969

2443

errno = argz_add(&interfaces_to_take_down,

2970

2444

&interfaces_to_take_down_size,

2993

2467

goto end;

2994

2468

}

2995

2469

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

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

2470

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

3003

2471

if(ret == -1){

3004

2472

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

3005

2473

exitcode = EX_UNAVAILABLE;

3127

2595

3128

2596

/* Allocate a new server */

3129

2597

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3130

&config, NULL, NULL, &ret);

2598

&config, NULL, NULL, &ret_errno);

3131

2599

3132

2600

/* Free the Avahi configuration data */

3133

2601

avahi_server_config_free(&config);

3136

2604

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

3137

2605

if(mc.server == NULL){

3138

2606

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

3139

avahi_strerror(ret));

2607

avahi_strerror(ret_errno));

3140

2608

exitcode = EX_UNAVAILABLE;

3141

2609

goto end;

3142

2610

}

3177

2645

end:

3178

2646

3179

2647

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

}

2648

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

3187

2649

}

3188

2650

3189

2651

/* Cleanup things */

3200

2662

3201

2663

if(gnutls_initialized){

3202

2664

gnutls_certificate_free_credentials(mc.cred);

2665

gnutls_global_deinit();

3203

2666

gnutls_dh_params_deinit(mc.dh_params);

3204

2667

}

3205

2668

3228

2691

3229

2692

/* Re-raise privileges */

3230

2693

{

3231

ret = raise_privileges();

3232

if(ret != 0){

3233

errno = ret;

2694

ret_errno = raise_privileges();

2695

if(ret_errno != 0){

2696

errno = ret_errno;

3234

2697

perror_plus("Failed to raise privileges");

3235

2698

} else {

3236

2699

3241

2704

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

3242

2705

{

3243

2706

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;

2707

while((interface=argz_next(interfaces_to_take_down,

2708

interfaces_to_take_down_size,

2709

interface))){

2710

ret_errno = take_down_interface(interface);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

3250

2713

perror_plus("Failed to take down interface");

3251

2714

}

3252

2715

}

3257

2720

}

3258

2721

}

3259

2722

3260

ret = lower_privileges_permanently();

3261

if(ret != 0){

3262

errno = ret;

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

3263

2726

perror_plus("Failed to lower privileges permanently");

3264

2727

}

3265

2728

}

3267

2730

free(interfaces_to_take_down);

3268

2731

free(interfaces_hooks);

3269

2732

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

2733

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

3325

2734

if(tempdir != NULL){

3326

clean_dir_at(-1, tempdir, 0);

2735

struct dirent **direntries = NULL;

2736

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

2737

O_NOFOLLOW));

2738

if(tempdir_fd == -1){

2739

perror_plus("open");

2740

} else {

2741

#ifdef __GLIBC__

2742

#if __GLIBC_PREREQ(2, 15)

2743

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

2744

notdotentries, alphasort);

2745

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

2746

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

2747

alphasort);

2748

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

2749

#else /* not __GLIBC__ */

2750

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

2751

alphasort);

2752

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2754

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

2755

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

2756

if(ret == -1){

2757

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

2758

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

2759

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

2760

}

2761

free(direntries[i]);

2762

}

2763

2764

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

2765

free(direntries);

2766

if(numentries == -1){

2767

perror_plus("scandir");

2768

}

2769

ret = rmdir(tempdir);

2770

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

2771

perror_plus("rmdir");

2772

}

2773

}

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2775

}

3327

2776

}

3328

2777

3329

2778

if(quit_now){