/mandos/release : revision 237.7.498

9

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

10

*

11

* Everything else is

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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

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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

14

*

15

* This file is part of Mandos.

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*

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

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* 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.

21

*

22

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

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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.

24

26

*

25

27

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

26

* along with this program. If not, see

27

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

28

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

28

29

*

29

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(),

51

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

}

493

571

return plaintext_length;

494

572

}

495

573

574

__attribute__((warn_unused_result, const))

575

static const char *safe_string(const char *str){

576

if(str == NULL)

577

return "(unknown)";

578

return str;

579

}

580

496

581

__attribute__((warn_unused_result))

497

582

static const char *safer_gnutls_strerror(int value){

498

583

const char *ret = gnutls_strerror(value);

499

if(ret == NULL)

500

ret = "(unknown)";

501

return ret;

584

return safe_string(ret);

502

585

}

503

586

504

587

/* GnuTLS log function callback */

508

591

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

509

592

}

510

593

511

__attribute__((nonnull, warn_unused_result))

594

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

512

595

static int init_gnutls_global(const char *pubkeyfilename,

513

596

const char *seckeyfilename,

597

const char *dhparamsfilename,

514

598

mandos_context *mc){

515

599

int ret;

600

unsigned int uret;

516

601

517

602

if(debug){

518

603

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

519

604

}

520

605

521

ret = gnutls_global_init();

522

if(ret != GNUTLS_E_SUCCESS){

523

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

524

safer_gnutls_strerror(ret));

525

return -1;

526

}

527

528

606

if(debug){

529

607

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

530

608

* - GnuTLS manual

538

616

if(ret != GNUTLS_E_SUCCESS){

539

617

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

540

618

safer_gnutls_strerror(ret));

541

gnutls_global_deinit();

542

619

return -1;

543

620

}

544

621

569

646

safer_gnutls_strerror(ret));

570

647

goto globalfail;

571

648

}

572

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

573

if(ret != GNUTLS_E_SUCCESS){

574

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

575

safer_gnutls_strerror(ret));

576

goto globalfail;

577

}

578

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;

660

while(true){

661

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

662

(size_t)params.size,

663

(size_t)params_capacity);

664

if(params_capacity == 0){

665

perror_plus("incbuffer");

666

free(params.data);

667

params.data = NULL;

668

dhparamsfilename = NULL;

669

break;

670

}

671

ssize_t bytes_read = read(dhpfile,

672

params.data + params.size,

673

BUFFER_SIZE);

674

/* EOF */

675

if(bytes_read == 0){

676

break;

677

}

678

/* check bytes_read for failure */

679

if(bytes_read < 0){

680

perror_plus("read");

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);

755

if(ret != GNUTLS_E_SUCCESS){

756

fprintf_plus(stderr, "Error initializing OpenPGP key"

757

" structure: %s",

758

safer_gnutls_strerror(ret));

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

}

783

}

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)));

793

}

794

}

795

}

796

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

797

if(uret != 0){

798

mc->dh_bits = uret;

799

if(debug){

800

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

801

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

802

safe_string(gnutls_sec_param_get_name

803

(sec_param)),

804

mc->dh_bits);

805

}

806

} else {

807

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

808

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

809

safe_string(gnutls_sec_param_get_name

810

(sec_param)),

811

safer_gnutls_strerror(ret));

812

goto globalfail;

813

}

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,

822

safer_gnutls_strerror(ret));

823

goto globalfail;

824

}

825

}

579

826

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

580

827

581

828

return 0;

583

830

globalfail:

584

831

585

832

gnutls_certificate_free_credentials(mc->cred);

586

gnutls_global_deinit();

587

833

gnutls_dh_params_deinit(mc->dh_params);

588

834

return -1;

589

835

}

641

887

/* ignore client certificate if any. */

642

888

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

889

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

645

646

890

return 0;

647

891

}

648

892

652

896

653

897

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

654

898

__attribute__((warn_unused_result))

655

error_t raise_privileges(void){

656

error_t old_errno = errno;

657

error_t ret_errno = 0;

899

int raise_privileges(void){

900

int old_errno = errno;

901

int ret = 0;

658

902

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

659

ret_errno = errno;

903

ret = errno;

660

904

}

661

905

errno = old_errno;

662

return ret_errno;

906

return ret;

663

907

}

664

908

665

909

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

666

910

__attribute__((warn_unused_result))

667

error_t raise_privileges_permanently(void){

668

error_t old_errno = errno;

669

error_t ret_errno = raise_privileges();

670

if(ret_errno != 0){

911

int raise_privileges_permanently(void){

912

int old_errno = errno;

913

int ret = raise_privileges();

914

if(ret != 0){

671

915

errno = old_errno;

672

return ret_errno;

916

return ret;

673

917

}

674

918

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

675

ret_errno = errno;

919

ret = errno;

676

920

}

677

921

errno = old_errno;

678

return ret_errno;

922

return ret;

679

923

}

680

924

681

925

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

682

926

__attribute__((warn_unused_result))

683

error_t lower_privileges(void){

684

error_t old_errno = errno;

685

error_t ret_errno = 0;

927

int lower_privileges(void){

928

int old_errno = errno;

929

int ret = 0;

686

930

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

687

ret_errno = errno;

931

ret = errno;

688

932

}

689

933

errno = old_errno;

690

return ret_errno;

934

return ret;

691

935

}

692

936

693

937

/* Lower privileges permanently */

694

938

__attribute__((warn_unused_result))

695

error_t lower_privileges_permanently(void){

696

error_t old_errno = errno;

697

error_t ret_errno = 0;

939

int lower_privileges_permanently(void){

940

int old_errno = errno;

941

int ret = 0;

698

942

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

699

ret_errno = errno;

943

ret = errno;

700

944

}

701

945

errno = old_errno;

702

return ret_errno;

946

return ret;

703

947

}

704

948

705

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

949

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

706

950

__attribute__((nonnull, warn_unused_result))

707

static bool add_remove_local_route(const bool add,

951

static bool add_delete_local_route(const bool add,

708

952

const char *address,

709

953

AvahiIfIndex if_index){

710

954

int ret;

711

955

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

712

956

char add_arg[] = "add";

713

957

char delete_arg[] = "delete";

958

char debug_flag[] = "--debug";

714

959

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

715

960

if(pluginhelperdir == NULL){

716

961

if(debug){

760

1005

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

761

1006

_exit(EX_OSERR);

762

1007

}

763

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

1008

ret = close(devnull);

764

1009

if(ret == -1){

765

1010

perror_plus("close");

766

1011

_exit(EX_OSERR);

783

1028

helper, O_RDONLY));

784

1029

if(helper_fd == -1){

785

1030

perror_plus("openat");

1031

close(helperdir_fd);

786

1032

_exit(EX_UNAVAILABLE);

787

1033

}

788

TEMP_FAILURE_RETRY(close(helperdir_fd));

1034

close(helperdir_fd);

789

1035

#ifdef __GNUC__

790

1036

#pragma GCC diagnostic push

791

1037

#pragma GCC diagnostic ignored "-Wcast-qual"

792

1038

#endif

793

1039

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

794

1040

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

795

interface, NULL }, environ) == -1){

1041

interface, debug ? debug_flag : NULL, NULL },

1042

environ) == -1){

796

1043

#ifdef __GNUC__

797

1044

#pragma GCC diagnostic pop

798

1045

#endif

850

1097

__attribute__((nonnull, warn_unused_result))

851

1098

static bool add_local_route(const char *address,

852

1099

AvahiIfIndex if_index){

853

return add_remove_local_route(true, address, if_index);

1100

if(debug){

1101

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

1102

}

1103

return add_delete_local_route(true, address, if_index);

854

1104

}

855

1105

856

1106

__attribute__((nonnull, warn_unused_result))

857

static bool remove_local_route(const char *address,

1107

static bool delete_local_route(const char *address,

858

1108

AvahiIfIndex if_index){

859

return add_remove_local_route(false, address, if_index);

1109

if(debug){

1110

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

1111

}

1112

return add_delete_local_route(false, address, if_index);

860

1113

}

861

1114

862

1115

/* Called when a Mandos server is found */

903

1156

bool match = false;

904

1157

{

905

1158

char *interface = NULL;

906

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

907

interface))){

1159

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

1160

mc->interfaces_size,

1161

interface))){

908

1162

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

909

1163

match = true;

910

1164

break;

952

1206

goto mandos_end;

953

1207

}

954

1208

955

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

956

1209

if(af == AF_INET6){

957

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

958

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);

959

1213

} else { /* IPv4 */

960

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

961

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);

962

1217

}

963

1218

if(ret < 0 ){

964

1219

int e = errno;

1043

1298

sizeof(struct sockaddr_in));

1044

1299

}

1045

1300

if(ret < 0){

1046

if(errno == ENETUNREACH

1301

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

1047

1302

and if_index != AVAHI_IF_UNSPEC

1048

1303

and connect_to == NULL

1049

1304

and not route_added and

1062

1317

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

1063

1318

1064

1319

Avahi bug reference:

1065

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

1320

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

1066

1321

https://bugs.debian.org/587961

1067

1322

*/

1323

if(debug){

1324

fprintf_plus(stderr, "Mandos server unreachable, trying"

1325

" direct route\n");

1326

}

1068

1327

int e = errno;

1069

1328

route_added = add_local_route(ip, if_index);

1070

1329

if(route_added){

1244

1503

&decrypted_buffer, mc);

1245

1504

if(decrypted_buffer_size >= 0){

1246

1505

1506

clearerr(stdout);

1247

1507

written = 0;

1248

1508

while(written < (size_t) decrypted_buffer_size){

1249

1509

if(quit_now){

1265

1525

}

1266

1526

written += (size_t)ret;

1267

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

}

1268

1538

retval = 0;

1269

1539

}

1270

1540

}

1274

1544

mandos_end:

1275

1545

{

1276

1546

if(route_added){

1277

if(not remove_local_route(ip, if_index)){

1278

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

1547

if(not delete_local_route(ip, if_index)){

1548

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

1279

1549

" interface %d", ip, if_index);

1280

1550

}

1281

1551

}

1283

1553

free(decrypted_buffer);

1284

1554

free(buffer);

1285

1555

if(tcp_sd >= 0){

1286

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

1556

ret = close(tcp_sd);

1287

1557

}

1288

1558

if(ret == -1){

1289

1559

if(e == 0){

1301

1571

return retval;

1302

1572

}

1303

1573

1304

__attribute__((nonnull))

1305

1574

static void resolve_callback(AvahiSServiceResolver *r,

1306

1575

AvahiIfIndex interface,

1307

1576

AvahiProtocol proto,

1444

1713

__attribute__((nonnull, warn_unused_result))

1445

1714

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

1446

1715

int ret;

1447

error_t ret_errno;

1716

int old_errno;

1448

1717

1449

1718

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

1450

1719

if(s < 0){

1451

ret_errno = errno;

1720

old_errno = errno;

1452

1721

perror_plus("socket");

1453

errno = ret_errno;

1722

errno = old_errno;

1454

1723

return false;

1455

1724

}

1456

strcpy(ifr->ifr_name, ifname);

1725

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

1726

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

1457

1727

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1458

1728

if(ret == -1){

1459

1729

if(debug){

1460

ret_errno = errno;

1730

old_errno = errno;

1461

1731

perror_plus("ioctl SIOCGIFFLAGS");

1462

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;

1463

1738

}

1464

1739

return false;

1465

1740

}

1741

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

1742

old_errno = errno;

1743

perror_plus("close");

1744

errno = old_errno;

1745

}

1466

1746

return true;

1467

1747

}

1468

1748

1729

2009

return;

1730

2010

}

1731

2011

}

1732

#ifdef __GLIBC__

1733

#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

}

1734

2017

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

1735

2018

runnable_hook, alphasort);

1736

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

1737

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

1738

alphasort);

1739

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

1740

#else /* not __GLIBC__ */

1741

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

1742

alphasort);

1743

#endif /* not __GLIBC__ */

1744

2019

if(numhooks == -1){

1745

2020

perror_plus("scandir");

2021

close(devnull);

1746

2022

return;

1747

2023

}

1748

2024

struct dirent *direntry;

1749

2025

int ret;

1750

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

1751

if(devnull == -1){

1752

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

1753

return;

1754

}

1755

2026

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

1756

2027

direntry = direntries[i];

1757

2028

if(debug){

1828

2099

perror_plus("openat");

1829

2100

_exit(EXIT_FAILURE);

1830

2101

}

1831

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

2102

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

1832

2103

perror_plus("close");

1833

2104

_exit(EXIT_FAILURE);

1834

2105

}

1837

2108

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

1838

2109

_exit(EX_OSERR);

1839

2110

}

1840

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

2111

ret = close(devnull);

1841

2112

if(ret == -1){

1842

2113

perror_plus("close");

1843

2114

_exit(EX_OSERR);

1892

2163

free(direntry);

1893

2164

}

1894

2165

free(direntries);

1895

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

2166

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

1896

2167

perror_plus("close");

1897

2168

} else {

1898

2169

hookdir_fd = -1;

1901

2172

}

1902

2173

1903

2174

__attribute__((nonnull, warn_unused_result))

1904

error_t bring_up_interface(const char *const interface,

1905

const float delay){

1906

error_t old_errno = errno;

2175

int bring_up_interface(const char *const interface,

2176

const float delay){

2177

int old_errno = errno;

1907

2178

int ret;

1908

2179

struct ifreq network;

1909

2180

unsigned int if_index = if_nametoindex(interface);

1919

2190

}

1920

2191

1921

2192

if(not interface_is_up(interface)){

1922

error_t ret_errno = 0, ioctl_errno = 0;

2193

int ret_errno = 0;

2194

int ioctl_errno = 0;

1923

2195

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

1924

2196

ret_errno = errno;

1925

2197

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

1938

2210

}

1939

2211

1940

2212

if(quit_now){

1941

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

2213

ret = close(sd);

1942

2214

if(ret == -1){

1943

2215

perror_plus("close");

1944

2216

}

1994

2266

}

1995

2267

1996

2268

/* Close the socket */

1997

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

2269

ret = close(sd);

1998

2270

if(ret == -1){

1999

2271

perror_plus("close");

2000

2272

}

2012

2284

2013

2285

/* Sleep checking until interface is running.

2014

2286

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

2015

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

2287

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

2016

2288

if(interface_is_running(interface)){

2017

2289

break;

2018

2290

}

2028

2300

}

2029

2301

2030

2302

__attribute__((nonnull, warn_unused_result))

2031

error_t take_down_interface(const char *const interface){

2032

error_t old_errno = errno;

2303

int take_down_interface(const char *const interface){

2304

int old_errno = errno;

2033

2305

struct ifreq network;

2034

2306

unsigned int if_index = if_nametoindex(interface);

2035

2307

if(if_index == 0){

2038

2310

return ENXIO;

2039

2311

}

2040

2312

if(interface_is_up(interface)){

2041

error_t ret_errno = 0, ioctl_errno = 0;

2313

int ret_errno = 0;

2314

int ioctl_errno = 0;

2042

2315

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

2043

2316

ret_errno = errno;

2044

2317

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

2082

2355

}

2083

2356

2084

2357

/* Close the socket */

2085

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

2358

int ret = close(sd);

2086

2359

if(ret == -1){

2087

2360

perror_plus("close");

2088

2361

}

2103

2376

}

2104

2377

2105

2378

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

2106

mandos_context mc = { .server = NULL, .dh_bits = 1024,

2107

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

2108

"+CTYPE-OPENPGP", .current_server = NULL,

2109

.interfaces = NULL, .interfaces_size = 0 };

2379

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

2380

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

2381

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

2382

.current_server = NULL, .interfaces = NULL,

2383

.interfaces_size = 0 };

2110

2384

AvahiSServiceBrowser *sb = NULL;

2111

2385

error_t ret_errno;

2112

2386

int ret;

2121

2395

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2122

2396

const char *seckey = PATHDIR "/" SECKEY;

2123

2397

const char *pubkey = PATHDIR "/" PUBKEY;

2398

const char *dh_params_file = NULL;

2124

2399

char *interfaces_hooks = NULL;

2125

2400

2126

2401

bool gnutls_initialized = false;

2179

2454

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

2180

2455

" Diffie-Hellman key exchange",

2181

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 },

2182

2462

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

2183

2463

.arg = "STRING",

2184

2464

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

2239

2519

}

2240

2520

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

2241

2521

break;

2522

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

2523

dh_params_file = arg;

2524

break;

2242

2525

case 130: /* --priority */

2243

2526

mc.priority = arg;

2244

2527

break;

2284

2567

.args_doc = "",

2285

2568

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

2286

2569

" passwords from a Mandos server" };

2287

ret = argp_parse(&argp, argc, argv,

2288

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2289

switch(ret){

2570

ret_errno = argp_parse(&argp, argc, argv,

2571

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2572

switch(ret_errno){

2290

2573

case 0:

2291

2574

break;

2292

2575

case ENOMEM:

2293

2576

default:

2294

errno = ret;

2577

errno = ret_errno;

2295

2578

perror_plus("argp_parse");

2296

2579

exitcode = EX_OSERR;

2297

2580

goto end;

2303

2586

2304

2587

{

2305

2588

/* Work around Debian bug #633582:

2306

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

2589

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

2307

2590

2308

2591

/* Re-raise privileges */

2309

ret_errno = raise_privileges();

2310

if(ret_errno != 0){

2311

errno = ret_errno;

2592

ret = raise_privileges();

2593

if(ret != 0){

2594

errno = ret;

2312

2595

perror_plus("Failed to raise privileges");

2313

2596

} else {

2314

2597

struct stat st;

2330

2613

}

2331

2614

}

2332

2615

}

2333

TEMP_FAILURE_RETRY(close(seckey_fd));

2616

close(seckey_fd);

2334

2617

}

2335

2618

}

2336

2619

2351

2634

}

2352

2635

}

2353

2636

}

2354

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);

2355

2660

}

2356

2661

}

2357

2662

2358

2663

/* Lower privileges */

2359

ret_errno = lower_privileges();

2360

if(ret_errno != 0){

2361

errno = ret_errno;

2664

ret = lower_privileges();

2665

if(ret != 0){

2666

errno = ret;

2362

2667

perror_plus("Failed to lower privileges");

2363

2668

}

2364

2669

}

2534

2839

errno = bring_up_interface(interface, delay);

2535

2840

if(not interface_was_up){

2536

2841

if(errno != 0){

2537

perror_plus("Failed to bring up interface");

2842

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

2843

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

2538

2844

} else {

2539

2845

errno = argz_add(&interfaces_to_take_down,

2540

2846

&interfaces_to_take_down_size,

2563

2869

goto end;

2564

2870

}

2565

2871

2566

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

2872

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

2567

2873

if(ret == -1){

2568

2874

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

2569

2875

exitcode = EX_UNAVAILABLE;

2691

2997

2692

2998

/* Allocate a new server */

2693

2999

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2694

&config, NULL, NULL, &ret_errno);

3000

&config, NULL, NULL, &ret);

2695

3001

2696

3002

/* Free the Avahi configuration data */

2697

3003

avahi_server_config_free(&config);

2700

3006

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

2701

3007

if(mc.server == NULL){

2702

3008

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

2703

avahi_strerror(ret_errno));

3009

avahi_strerror(ret));

2704

3010

exitcode = EX_UNAVAILABLE;

2705

3011

goto end;

2706

3012

}

2741

3047

end:

2742

3048

2743

3049

if(debug){

2744

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

}

2745

3057

}

2746

3058

2747

3059

/* Cleanup things */

2758

3070

2759

3071

if(gnutls_initialized){

2760

3072

gnutls_certificate_free_credentials(mc.cred);

2761

gnutls_global_deinit();

2762

3073

gnutls_dh_params_deinit(mc.dh_params);

2763

3074

}

2764

3075

2787

3098

2788

3099

/* Re-raise privileges */

2789

3100

{

2790

ret_errno = raise_privileges();

2791

if(ret_errno != 0){

2792

errno = ret_errno;

3101

ret = raise_privileges();

3102

if(ret != 0){

3103

errno = ret;

2793

3104

perror_plus("Failed to raise privileges");

2794

3105

} else {

2795

3106

2800

3111

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

2801

3112

{

2802

3113

char *interface = NULL;

2803

while((interface=argz_next(interfaces_to_take_down,

2804

interfaces_to_take_down_size,

2805

interface))){

2806

ret_errno = take_down_interface(interface);

2807

if(ret_errno != 0){

2808

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;

2809

3120

perror_plus("Failed to take down interface");

2810

3121

}

2811

3122

}

2816

3127

}

2817

3128

}

2818

3129

2819

ret_errno = lower_privileges_permanently();

2820

if(ret_errno != 0){

2821

errno = ret_errno;

3130

ret = lower_privileges_permanently();

3131

if(ret != 0){

3132

errno = ret;

2822

3133

perror_plus("Failed to lower privileges permanently");

2823

3134

}

2824

3135

}

2826

3137

free(interfaces_to_take_down);

2827

3138

free(interfaces_hooks);

2828

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

2829

3194

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

2830

3195

if(tempdir != NULL){

2831

struct dirent **direntries = NULL;

2832

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

2833

| O_NOFOLLOW

2834

| O_DIRECTORY

2835

| O_PATH));

2836

if(tempdir_fd == -1){

2837

perror_plus("open");

2838

} else {

2839

#ifdef __GLIBC__

2840

#if __GLIBC_PREREQ(2, 15)

2841

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

2842

notdotentries, alphasort);

2843

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

2844

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

2845

alphasort);

2846

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

2847

#else /* not __GLIBC__ */

2848

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

2849

alphasort);

2850

#endif /* not __GLIBC__ */

2851

if(numentries >= 0){

2852

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

2853

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

2854

if(ret == -1){

2855

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

2856

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

2857

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

2858

}

2859

free(direntries[i]);

2860

}

2861

2862

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

2863

free(direntries);

2864

if(numentries == -1){

2865

perror_plus("scandir");

2866

}

2867

ret = rmdir(tempdir);

2868

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

2869

perror_plus("rmdir");

2870

}

2871

}

2872

TEMP_FAILURE_RETRY(close(tempdir_fd));

2873

}

3196

clean_dir_at(-1, tempdir, 0);

2874

3197

}

2875

3198

2876

3199

if(quit_now){