/mandos/release : revision 237.7.498

9

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

10

*

11

* Everything else is

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13

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*

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* 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

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* 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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13

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*

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

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* (at your option) any later version.

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*

22

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

21

23

* WITHOUT ANY WARRANTY; without even the implied warranty of

22

24

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

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25

* General Public License for more details.

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26

*

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27

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

26

* along with this program. If not, see

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

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

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29

*

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30

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

30

31

*/

46

47

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

47

48

strtof(), abort() */

48

49

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

49

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

50

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

50

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

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asprintf(), strncpy(), strsignal()

52

*/

51

53

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

52

54

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

53

55

sockaddr_in6, PF_INET6,

57

59

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

58

60

inet_pton(), connect(),

59

61

getnameinfo() */

60

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

62

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

61

63

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

62

64

*/

63

65

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

64

66

strtoimax() */

65

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

67

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

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

66

72

program_invocation_short_name */

67

73

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

68

74

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

304

310

gpgme_strsource(rc), gpgme_strerror(rc));

305

311

return false;

306

312

}

313

{

314

gpgme_import_result_t import_result

315

= gpgme_op_import_result(mc->ctx);

316

if((import_result->imported < 1

317

or import_result->not_imported > 0)

318

and import_result->unchanged == 0){

319

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

320

fprintf_plus(stderr,

321

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

322

import_result->considered);

323

fprintf_plus(stderr,

324

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

325

import_result->no_user_id);

326

fprintf_plus(stderr,

327

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

328

import_result->imported);

329

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

330

import_result->imported_rsa);

331

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

332

import_result->unchanged);

333

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

334

import_result->new_user_ids);

335

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

336

import_result->new_sub_keys);

337

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

338

import_result->new_signatures);

339

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

340

import_result->new_revocations);

341

fprintf_plus(stderr,

342

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

343

import_result->secret_read);

344

fprintf_plus(stderr,

345

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

346

import_result->secret_imported);

347

fprintf_plus(stderr,

348

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

349

import_result->secret_unchanged);

350

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

351

import_result->not_imported);

352

for(gpgme_import_status_t import_status

353

= import_result->imports;

354

import_status != NULL;

355

import_status = import_status->next){

356

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

357

import_status->fpr);

358

if(import_status->result != GPG_ERR_NO_ERROR){

359

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

360

gpgme_strsource(import_status->result),

361

gpgme_strerror(import_status->result));

362

}

363

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

364

fprintf_plus(stderr,

365

import_status->status & GPGME_IMPORT_NEW

366

? "The key was new.\n"

367

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

368

fprintf_plus(stderr,

369

import_status->status & GPGME_IMPORT_UID

370

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

371

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

372

fprintf_plus(stderr,

373

import_status->status & GPGME_IMPORT_SIG

374

? "The key contained new signatures.\n"

375

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

376

fprintf_plus(stderr,

377

import_status->status & GPGME_IMPORT_SUBKEY

378

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

379

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

380

fprintf_plus(stderr,

381

import_status->status & GPGME_IMPORT_SECRET

382

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

383

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

384

}

385

return false;

386

}

387

}

307

388

308

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

389

ret = close(fd);

309

390

if(ret == -1){

310

391

perror_plus("close");

311

392

}

350

431

/* Create new GPGME "context" */

351

432

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

352

433

if(rc != GPG_ERR_NO_ERROR){

353

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

354

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

355

gpgme_strerror(rc));

434

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

435

gpgme_strsource(rc), gpgme_strerror(rc));

356

436

return false;

357

437

}

358

438

394

474

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

395

475

rc = gpgme_data_new(&dh_plain);

396

476

if(rc != GPG_ERR_NO_ERROR){

397

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

398

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

477

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

399

478

gpgme_strsource(rc), gpgme_strerror(rc));

400

479

gpgme_data_release(dh_crypto);

401

480

return -1;

414

493

if(result == NULL){

415

494

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

416

495

} else {

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);

496

if(result->unsupported_algorithm != NULL) {

497

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

498

result->unsupported_algorithm);

499

}

500

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

501

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

421

502

if(result->file_name != NULL){

422

503

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

423

504

}

424

gpgme_recipient_t recipient;

425

recipient = result->recipients;

426

while(recipient != NULL){

505

506

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

507

r = r->next){

427

508

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

428

gpgme_pubkey_algo_name

429

(recipient->pubkey_algo));

430

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

509

gpgme_pubkey_algo_name(r->pubkey_algo));

510

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

431

511

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

432

recipient->status == GPG_ERR_NO_SECKEY

433

? "No" : "Yes");

434

recipient = recipient->next;

512

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

435

513

}

436

514

}

437

515

}

513

591

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

514

592

}

515

593

516

__attribute__((nonnull, warn_unused_result))

594

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

517

595

static int init_gnutls_global(const char *pubkeyfilename,

518

596

const char *seckeyfilename,

597

const char *dhparamsfilename,

519

598

mandos_context *mc){

520

599

int ret;

521

600

unsigned int uret;

524

603

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

525

604

}

526

605

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

534

606

if(debug){

535

607

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

536

608

* - GnuTLS manual

544

616

if(ret != GNUTLS_E_SUCCESS){

545

617

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

546

618

safer_gnutls_strerror(ret));

547

gnutls_global_deinit();

548

619

return -1;

549

620

}

550

621

575

646

safer_gnutls_strerror(ret));

576

647

goto globalfail;

577

648

}

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;

649

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

650

if(dhparamsfilename != NULL){

651

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

652

do {

653

int dhpfile = open(dhparamsfilename, O_RDONLY);

654

if(dhpfile == -1){

655

perror_plus("open");

656

dhparamsfilename = NULL;

657

break;

658

}

659

size_t params_capacity = 0;

585

660

while(true){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

661

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

662

(size_t)params.size,

663

(size_t)params_capacity);

664

if(params_capacity == 0){

590

665

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

666

free(params.data);

667

params.data = NULL;

668

dhparamsfilename = NULL;

593

669

break;

594

670

}

595

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

671

ssize_t bytes_read = read(dhpfile,

672

params.data + params.size,

596

673

BUFFER_SIZE);

597

674

/* EOF */

598

675

if(bytes_read == 0){

601

678

/* check bytes_read for failure */

602

679

if(bytes_read < 0){

603

680

perror_plus("read");

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);

681

free(params.data);

682

params.data = NULL;

683

dhparamsfilename = NULL;

684

break;

685

}

686

params.size += (unsigned int)bytes_read;

687

}

688

ret = close(dhpfile);

689

if(ret == -1){

690

perror_plus("close");

691

}

692

if(params.data == NULL){

693

dhparamsfilename = NULL;

694

}

695

if(dhparamsfilename == NULL){

696

break;

697

}

698

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

699

GNUTLS_X509_FMT_PEM);

700

if(ret != GNUTLS_E_SUCCESS){

701

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

702

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

703

safer_gnutls_strerror(ret));

704

dhparamsfilename = NULL;

705

}

706

free(params.data);

707

} while(false);

708

}

709

if(dhparamsfilename == NULL){

710

if(mc->dh_bits == 0){

711

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

712

/* Try to read the private key file */

713

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

714

do {

715

int secfile = open(seckeyfilename, O_RDONLY);

716

if(secfile == -1){

717

perror_plus("open");

718

break;

719

}

720

size_t buffer_capacity = 0;

721

while(true){

722

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

723

(size_t)buffer.size,

724

(size_t)buffer_capacity);

725

if(buffer_capacity == 0){

726

perror_plus("incbuffer");

727

free(buffer.data);

728

buffer.data = NULL;

729

break;

730

}

731

ssize_t bytes_read = read(secfile,

732

buffer.data + buffer.size,

733

BUFFER_SIZE);

734

/* EOF */

735

if(bytes_read == 0){

736

break;

737

}

738

/* check bytes_read for failure */

739

if(bytes_read < 0){

740

perror_plus("read");

741

free(buffer.data);

742

buffer.data = NULL;

743

break;

744

}

745

buffer.size += (unsigned int)bytes_read;

746

}

747

close(secfile);

748

} while(false);

749

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

750

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

751

if(buffer.data != NULL){

752

{

753

gnutls_openpgp_privkey_t privkey = NULL;

754

ret = gnutls_openpgp_privkey_init(&privkey);

627

755

if(ret != GNUTLS_E_SUCCESS){

628

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

756

fprintf_plus(stderr, "Error initializing OpenPGP key"

757

" structure: %s",

629

758

safer_gnutls_strerror(ret));

630

privkey = NULL;

759

free(buffer.data);

760

buffer.data = NULL;

761

} else {

762

ret = gnutls_openpgp_privkey_import

763

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

764

if(ret != GNUTLS_E_SUCCESS){

765

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

766

safer_gnutls_strerror(ret));

767

privkey = NULL;

768

}

769

free(buffer.data);

770

buffer.data = NULL;

771

if(privkey != NULL){

772

/* Use private key to suggest an appropriate

773

sec_param */

774

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

775

gnutls_openpgp_privkey_deinit(privkey);

776

if(debug){

777

fprintf_plus(stderr, "This OpenPGP key implies using"

778

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

779

safe_string(gnutls_sec_param_get_name

780

(sec_param)));

781

}

782

}

631

783

}

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

}

784

}

785

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

786

/* Err on the side of caution */

787

sec_param = GNUTLS_SEC_PARAM_ULTRA;

788

if(debug){

789

fprintf_plus(stderr, "Falling back to security parameter"

790

" \"%s\"\n",

791

safe_string(gnutls_sec_param_get_name

792

(sec_param)));

644

793

}

645

794

}

646

795

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

796

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

797

if(uret != 0){

798

mc->dh_bits = uret;

650

799

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

800

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

801

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

653

802

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

803

(sec_param)),

804

mc->dh_bits);

655

805

}

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",

806

} else {

807

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

808

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

664

809

safe_string(gnutls_sec_param_get_name

665

810

(sec_param)),

666

mc->dh_bits);

811

safer_gnutls_strerror(ret));

812

goto globalfail;

667

813

}

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)),

814

} else if(debug){

815

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

816

mc->dh_bits);

817

}

818

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

819

if(ret != GNUTLS_E_SUCCESS){

820

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

821

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

672

822

safer_gnutls_strerror(ret));

673

823

goto globalfail;

674

824

}

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

825

}

686

826

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

687

827

688

828

return 0;

690

830

globalfail:

691

831

692

832

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

694

833

gnutls_dh_params_deinit(mc->dh_params);

695

834

return -1;

696

835

}

748

887

/* ignore client certificate if any. */

749

888

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

750

889

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

753

890

return 0;

754

891

}

755

892

759

896

760

897

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

761

898

__attribute__((warn_unused_result))

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

899

int raise_privileges(void){

900

int old_errno = errno;

901

int ret = 0;

765

902

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

766

ret_errno = errno;

903

ret = errno;

767

904

}

768

905

errno = old_errno;

769

return ret_errno;

906

return ret;

770

907

}

771

908

772

909

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

773

910

__attribute__((warn_unused_result))

774

error_t raise_privileges_permanently(void){

775

error_t old_errno = errno;

776

error_t ret_errno = raise_privileges();

777

if(ret_errno != 0){

911

int raise_privileges_permanently(void){

912

int old_errno = errno;

913

int ret = raise_privileges();

914

if(ret != 0){

778

915

errno = old_errno;

779

return ret_errno;

916

return ret;

780

917

}

781

918

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

782

ret_errno = errno;

919

ret = errno;

783

920

}

784

921

errno = old_errno;

785

return ret_errno;

922

return ret;

786

923

}

787

924

788

925

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

789

926

__attribute__((warn_unused_result))

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

927

int lower_privileges(void){

928

int old_errno = errno;

929

int ret = 0;

793

930

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

794

ret_errno = errno;

931

ret = errno;

795

932

}

796

933

errno = old_errno;

797

return ret_errno;

934

return ret;

798

935

}

799

936

800

937

/* Lower privileges permanently */

801

938

__attribute__((warn_unused_result))

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

939

int lower_privileges_permanently(void){

940

int old_errno = errno;

941

int ret = 0;

805

942

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

806

ret_errno = errno;

943

ret = errno;

807

944

}

808

945

errno = old_errno;

809

return ret_errno;

946

return ret;

810

947

}

811

948

812

949

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

868

1005

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

869

1006

_exit(EX_OSERR);

870

1007

}

871

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

1008

ret = close(devnull);

872

1009

if(ret == -1){

873

1010

perror_plus("close");

874

1011

_exit(EX_OSERR);

891

1028

helper, O_RDONLY));

892

1029

if(helper_fd == -1){

893

1030

perror_plus("openat");

1031

close(helperdir_fd);

894

1032

_exit(EX_UNAVAILABLE);

895

1033

}

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

1034

close(helperdir_fd);

897

1035

#ifdef __GNUC__

898

1036

#pragma GCC diagnostic push

899

1037

#pragma GCC diagnostic ignored "-Wcast-qual"

1018

1156

bool match = false;

1019

1157

{

1020

1158

char *interface = NULL;

1021

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

1022

interface))){

1159

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

1160

mc->interfaces_size,

1161

interface))){

1023

1162

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

1024

1163

match = true;

1025

1164

break;

1067

1206

goto mandos_end;

1068

1207

}

1069

1208

1070

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

1071

1209

if(af == AF_INET6){

1072

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

1073

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

1210

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

1211

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

1212

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

1074

1213

} else { /* IPv4 */

1075

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

1076

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

1214

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

1215

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

1216

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

1077

1217

}

1078

1218

if(ret < 0 ){

1079

1219

int e = errno;

1158

1298

sizeof(struct sockaddr_in));

1159

1299

}

1160

1300

if(ret < 0){

1161

if(errno == ENETUNREACH

1301

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

1162

1302

and if_index != AVAHI_IF_UNSPEC

1163

1303

and connect_to == NULL

1164

1304

and not route_added and

1177

1317

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

1178

1318

1179

1319

Avahi bug reference:

1180

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

1320

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

1181

1321

https://bugs.debian.org/587961

1182

1322

*/

1183

1323

if(debug){

1363

1503

&decrypted_buffer, mc);

1364

1504

if(decrypted_buffer_size >= 0){

1365

1505

1506

clearerr(stdout);

1366

1507

written = 0;

1367

1508

while(written < (size_t) decrypted_buffer_size){

1368

1509

if(quit_now){

1384

1525

}

1385

1526

written += (size_t)ret;

1386

1527

}

1528

ret = fflush(stdout);

1529

if(ret != 0){

1530

int e = errno;

1531

if(debug){

1532

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

1533

strerror(errno));

1534

}

1535

errno = e;

1536

goto mandos_end;

1537

}

1387

1538

retval = 0;

1388

1539

}

1389

1540

}

1402

1553

free(decrypted_buffer);

1403

1554

free(buffer);

1404

1555

if(tcp_sd >= 0){

1405

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

1556

ret = close(tcp_sd);

1406

1557

}

1407

1558

if(ret == -1){

1408

1559

if(e == 0){

1420

1571

return retval;

1421

1572

}

1422

1573

1423

__attribute__((nonnull))

1424

1574

static void resolve_callback(AvahiSServiceResolver *r,

1425

1575

AvahiIfIndex interface,

1426

1576

AvahiProtocol proto,

1563

1713

__attribute__((nonnull, warn_unused_result))

1564

1714

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

1565

1715

int ret;

1566

error_t ret_errno;

1716

int old_errno;

1567

1717

1568

1718

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

1569

1719

if(s < 0){

1570

ret_errno = errno;

1720

old_errno = errno;

1571

1721

perror_plus("socket");

1572

errno = ret_errno;

1722

errno = old_errno;

1573

1723

return false;

1574

1724

}

1575

strcpy(ifr->ifr_name, ifname);

1725

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

1726

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

1576

1727

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1577

1728

if(ret == -1){

1578

1729

if(debug){

1579

ret_errno = errno;

1730

old_errno = errno;

1580

1731

perror_plus("ioctl SIOCGIFFLAGS");

1581

errno = ret_errno;

1732

errno = old_errno;

1733

}

1734

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

1735

old_errno = errno;

1736

perror_plus("close");

1737

errno = old_errno;

1582

1738

}

1583

1739

return false;

1584

1740

}

1741

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

1742

old_errno = errno;

1743

perror_plus("close");

1744

errno = old_errno;

1745

}

1585

1746

return true;

1586

1747

}

1587

1748

1848

2009

return;

1849

2010

}

1850

2011

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

2012

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

2013

if(devnull == -1){

2014

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

2015

return;

2016

}

1853

2017

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

1854

2018

runnable_hook, alphasort);

1855

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

1856

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

1857

alphasort);

1858

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

1859

#else /* not __GLIBC__ */

1860

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

1861

alphasort);

1862

#endif /* not __GLIBC__ */

1863

2019

if(numhooks == -1){

1864

2020

perror_plus("scandir");

2021

close(devnull);

1865

2022

return;

1866

2023

}

1867

2024

struct dirent *direntry;

1868

2025

int ret;

1869

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

1870

if(devnull == -1){

1871

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

1872

return;

1873

}

1874

2026

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

1875

2027

direntry = direntries[i];

1876

2028

if(debug){

1947

2099

perror_plus("openat");

1948

2100

_exit(EXIT_FAILURE);

1949

2101

}

1950

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

2102

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

1951

2103

perror_plus("close");

1952

2104

_exit(EXIT_FAILURE);

1953

2105

}

1956

2108

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

1957

2109

_exit(EX_OSERR);

1958

2110

}

1959

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

2111

ret = close(devnull);

1960

2112

if(ret == -1){

1961

2113

perror_plus("close");

1962

2114

_exit(EX_OSERR);

2011

2163

free(direntry);

2012

2164

}

2013

2165

free(direntries);

2014

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

2166

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

2015

2167

perror_plus("close");

2016

2168

} else {

2017

2169

hookdir_fd = -1;

2020

2172

}

2021

2173

2022

2174

__attribute__((nonnull, warn_unused_result))

2023

error_t bring_up_interface(const char *const interface,

2024

const float delay){

2025

error_t old_errno = errno;

2175

int bring_up_interface(const char *const interface,

2176

const float delay){

2177

int old_errno = errno;

2026

2178

int ret;

2027

2179

struct ifreq network;

2028

2180

unsigned int if_index = if_nametoindex(interface);

2038

2190

}

2039

2191

2040

2192

if(not interface_is_up(interface)){

2041

error_t ret_errno = 0, ioctl_errno = 0;

2193

int ret_errno = 0;

2194

int ioctl_errno = 0;

2042

2195

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

2043

2196

ret_errno = errno;

2044

2197

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

2057

2210

}

2058

2211

2059

2212

if(quit_now){

2060

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

2213

ret = close(sd);

2061

2214

if(ret == -1){

2062

2215

perror_plus("close");

2063

2216

}

2113

2266

}

2114

2267

2115

2268

/* Close the socket */

2116

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

2269

ret = close(sd);

2117

2270

if(ret == -1){

2118

2271

perror_plus("close");

2119

2272

}

2131

2284

2132

2285

/* Sleep checking until interface is running.

2133

2286

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

2134

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

2287

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

2135

2288

if(interface_is_running(interface)){

2136

2289

break;

2137

2290

}

2147

2300

}

2148

2301

2149

2302

__attribute__((nonnull, warn_unused_result))

2150

error_t take_down_interface(const char *const interface){

2151

error_t old_errno = errno;

2303

int take_down_interface(const char *const interface){

2304

int old_errno = errno;

2152

2305

struct ifreq network;

2153

2306

unsigned int if_index = if_nametoindex(interface);

2154

2307

if(if_index == 0){

2157

2310

return ENXIO;

2158

2311

}

2159

2312

if(interface_is_up(interface)){

2160

error_t ret_errno = 0, ioctl_errno = 0;

2313

int ret_errno = 0;

2314

int ioctl_errno = 0;

2161

2315

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

2162

2316

ret_errno = errno;

2163

2317

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

2201

2355

}

2202

2356

2203

2357

/* Close the socket */

2204

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

2358

int ret = close(sd);

2205

2359

if(ret == -1){

2206

2360

perror_plus("close");

2207

2361

}

2223

2377

2224

2378

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

2225

2379

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

2226

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

2227

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

2228

.interfaces = NULL, .interfaces_size = 0 };

2380

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

2381

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

2382

.current_server = NULL, .interfaces = NULL,

2383

.interfaces_size = 0 };

2229

2384

AvahiSServiceBrowser *sb = NULL;

2230

2385

error_t ret_errno;

2231

2386

int ret;

2240

2395

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2241

2396

const char *seckey = PATHDIR "/" SECKEY;

2242

2397

const char *pubkey = PATHDIR "/" PUBKEY;

2398

const char *dh_params_file = NULL;

2243

2399

char *interfaces_hooks = NULL;

2244

2400

2245

2401

bool gnutls_initialized = false;

2298

2454

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

2299

2455

" Diffie-Hellman key exchange",

2300

2456

.group = 2 },

2457

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

2458

.arg = "FILE",

2459

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

2460

" for the Diffie-Hellman key exchange",

2461

.group = 2 },

2301

2462

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

2302

2463

.arg = "STRING",

2303

2464

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

2358

2519

}

2359

2520

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

2360

2521

break;

2522

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

2523

dh_params_file = arg;

2524

break;

2361

2525

case 130: /* --priority */

2362

2526

mc.priority = arg;

2363

2527

break;

2403

2567

.args_doc = "",

2404

2568

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

2405

2569

" passwords from a Mandos server" };

2406

ret = argp_parse(&argp, argc, argv,

2407

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2408

switch(ret){

2570

ret_errno = argp_parse(&argp, argc, argv,

2571

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2572

switch(ret_errno){

2409

2573

case 0:

2410

2574

break;

2411

2575

case ENOMEM:

2412

2576

default:

2413

errno = ret;

2577

errno = ret_errno;

2414

2578

perror_plus("argp_parse");

2415

2579

exitcode = EX_OSERR;

2416

2580

goto end;

2422

2586

2423

2587

{

2424

2588

/* Work around Debian bug #633582:

2425

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

2589

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

2426

2590

2427

2591

/* Re-raise privileges */

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2592

ret = raise_privileges();

2593

if(ret != 0){

2594

errno = ret;

2431

2595

perror_plus("Failed to raise privileges");

2432

2596

} else {

2433

2597

struct stat st;

2449

2613

}

2450

2614

}

2451

2615

}

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

2616

close(seckey_fd);

2453

2617

}

2454

2618

}

2455

2619

2470

2634

}

2471

2635

}

2472

2636

}

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

2637

close(pubkey_fd);

2638

}

2639

}

2640

2641

if(dh_params_file != NULL

2642

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

2643

int dhparams_fd = open(dh_params_file, O_RDONLY);

2644

if(dhparams_fd == -1){

2645

perror_plus("open");

2646

} else {

2647

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

2648

if(ret == -1){

2649

perror_plus("fstat");

2650

} else {

2651

if(S_ISREG(st.st_mode)

2652

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

2653

ret = fchown(dhparams_fd, uid, gid);

2654

if(ret == -1){

2655

perror_plus("fchown");

2656

}

2657

}

2658

}

2659

close(dhparams_fd);

2474

2660

}

2475

2661

}

2476

2662

2477

2663

/* Lower privileges */

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2664

ret = lower_privileges();

2665

if(ret != 0){

2666

errno = ret;

2481

2667

perror_plus("Failed to lower privileges");

2482

2668

}

2483

2669

}

2653

2839

errno = bring_up_interface(interface, delay);

2654

2840

if(not interface_was_up){

2655

2841

if(errno != 0){

2656

perror_plus("Failed to bring up interface");

2842

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

2843

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

2657

2844

} else {

2658

2845

errno = argz_add(&interfaces_to_take_down,

2659

2846

&interfaces_to_take_down_size,

2682

2869

goto end;

2683

2870

}

2684

2871

2685

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

2872

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

2686

2873

if(ret == -1){

2687

2874

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

2688

2875

exitcode = EX_UNAVAILABLE;

2810

2997

2811

2998

/* Allocate a new server */

2812

2999

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2813

&config, NULL, NULL, &ret_errno);

3000

&config, NULL, NULL, &ret);

2814

3001

2815

3002

/* Free the Avahi configuration data */

2816

3003

avahi_server_config_free(&config);

2819

3006

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

2820

3007

if(mc.server == NULL){

2821

3008

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

2822

avahi_strerror(ret_errno));

3009

avahi_strerror(ret));

2823

3010

exitcode = EX_UNAVAILABLE;

2824

3011

goto end;

2825

3012

}

2860

3047

end:

2861

3048

2862

3049

if(debug){

2863

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

3050

if(signal_received){

3051

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

3052

argv[0], signal_received,

3053

strsignal(signal_received));

3054

} else {

3055

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

3056

}

2864

3057

}

2865

3058

2866

3059

/* Cleanup things */

2877

3070

2878

3071

if(gnutls_initialized){

2879

3072

gnutls_certificate_free_credentials(mc.cred);

2880

gnutls_global_deinit();

2881

3073

gnutls_dh_params_deinit(mc.dh_params);

2882

3074

}

2883

3075

2906

3098

2907

3099

/* Re-raise privileges */

2908

3100

{

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

3101

ret = raise_privileges();

3102

if(ret != 0){

3103

errno = ret;

2912

3104

perror_plus("Failed to raise privileges");

2913

3105

} else {

2914

3106

2919

3111

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

2920

3112

{

2921

3113

char *interface = NULL;

2922

while((interface=argz_next(interfaces_to_take_down,

2923

interfaces_to_take_down_size,

2924

interface))){

2925

ret_errno = take_down_interface(interface);

2926

if(ret_errno != 0){

2927

errno = ret_errno;

3114

while((interface = argz_next(interfaces_to_take_down,

3115

interfaces_to_take_down_size,

3116

interface))){

3117

ret = take_down_interface(interface);

3118

if(ret != 0){

3119

errno = ret;

2928

3120

perror_plus("Failed to take down interface");

2929

3121

}

2930

3122

}

2935

3127

}

2936

3128

}

2937

3129

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

3130

ret = lower_privileges_permanently();

3131

if(ret != 0){

3132

errno = ret;

2941

3133

perror_plus("Failed to lower privileges permanently");

2942

3134

}

2943

3135

}

2945

3137

free(interfaces_to_take_down);

2946

3138

free(interfaces_hooks);

2947

3139

3140

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

3141

uintmax_t level){

3142

struct dirent **direntries = NULL;

3143

int dret;

3144

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

3145

O_RDONLY

3146

| O_NOFOLLOW

3147

| O_DIRECTORY

3148

| O_PATH));

3149

if(dir_fd == -1){

3150

perror_plus("open");

3151

return;

3152

}

3153

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

3154

notdotentries, alphasort);

3155

if(numentries >= 0){

3156

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

3157

if(debug){

3158

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

3159

dirname, direntries[i]->d_name);

3160

}

3161

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

3162

if(dret == -1){

3163

if(errno == EISDIR){

3164

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

3165

AT_REMOVEDIR);

3166

}

3167

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

3168

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

3169

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

3170

/* Recurse only in this special case */

3171

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

3172

dret = 0;

3173

}

3174

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

3175

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

3176

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

3177

}

3178

}

3179

free(direntries[i]);

3180

}

3181

3182

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

3183

free(direntries);

3184

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3185

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

3186

perror_plus("rmdir");

3187

}

3188

} else {

3189

perror_plus("scandirat");

3190

}

3191

close(dir_fd);

3192

}

3193

2948

3194

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

2949

3195

if(tempdir != NULL){

2950

struct dirent **direntries = NULL;

2951

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

2952

| O_NOFOLLOW

2953

| O_DIRECTORY

2954

| O_PATH));

2955

if(tempdir_fd == -1){

2956

perror_plus("open");

2957

} else {

2958

#ifdef __GLIBC__

2959

#if __GLIBC_PREREQ(2, 15)

2960

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

2961

notdotentries, alphasort);

2962

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

2963

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

2964

alphasort);

2965

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

2966

#else /* not __GLIBC__ */

2967

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

2968

alphasort);

2969

#endif /* not __GLIBC__ */

2970

if(numentries >= 0){

2971

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

2972

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

2973

if(ret == -1){

2974

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

2975

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

2976

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

2977

}

2978

free(direntries[i]);

2979

}

2980

2981

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

2982

free(direntries);

2983

if(numentries == -1){

2984

perror_plus("scandir");

2985

}

2986

ret = rmdir(tempdir);

2987

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

2988

perror_plus("rmdir");

2989

}

2990

}

2991

TEMP_FAILURE_RETRY(close(tempdir_fd));

2992

}

3196

clean_dir_at(-1, tempdir, 0);

2993

3197

}

2994

3198

2995

3199

if(quit_now){