/mandos/trunk : revision 713

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.

19

*

20

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

23

21

* WITHOUT ANY WARRANTY; without even the implied warranty of

24

22

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

25

23

* General Public License for more details.

26

24

*

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

27

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

29

28

*

30

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,

246

240

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

247

241

if(ret == -1){

248

242

perror_plus("clock_gettime");

249

#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

free((char *)(new_server->ip));

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

243

free(new_server->ip);

257

244

free(new_server);

258

245

return false;

259

246

}

310

297

gpgme_strsource(rc), gpgme_strerror(rc));

311

298

return false;

312

299

}

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

}

388

300

389

ret = close(fd);

301

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

390

302

if(ret == -1){

391

303

perror_plus("close");

392

304

}

431

343

/* Create new GPGME "context" */

432

344

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

433

345

if(rc != GPG_ERR_NO_ERROR){

434

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

435

gpgme_strsource(rc), gpgme_strerror(rc));

346

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

347

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

348

gpgme_strerror(rc));

436

349

return false;

437

350

}

438

351

474

387

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

475

388

rc = gpgme_data_new(&dh_plain);

476

389

if(rc != GPG_ERR_NO_ERROR){

477

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

390

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

391

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

478

392

gpgme_strsource(rc), gpgme_strerror(rc));

479

393

gpgme_data_release(dh_crypto);

480

394

return -1;

493

407

if(result == NULL){

494

408

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

495

409

} else {

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");

410

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

411

result->unsupported_algorithm);

412

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

413

result->wrong_key_usage);

502

414

if(result->file_name != NULL){

503

415

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

504

416

}

574

486

return plaintext_length;

575

487

}

576

488

577

__attribute__((warn_unused_result, const))

578

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

579

if(str == NULL)

580

return "(unknown)";

581

return str;

582

}

583

584

489

__attribute__((warn_unused_result))

585

490

static const char *safer_gnutls_strerror(int value){

586

491

const char *ret = gnutls_strerror(value);

587

return safe_string(ret);

492

if(ret == NULL)

493

ret = "(unknown)";

494

return ret;

588

495

}

589

496

590

497

/* GnuTLS log function callback */

594

501

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

595

502

}

596

503

597

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

504

__attribute__((nonnull, warn_unused_result))

598

505

static int init_gnutls_global(const char *pubkeyfilename,

599

506

const char *seckeyfilename,

600

const char *dhparamsfilename,

601

507

mandos_context *mc){

602

508

int ret;

603

unsigned int uret;

604

509

605

510

if(debug){

606

511

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

607

512

}

608

513

514

ret = gnutls_global_init();

515

if(ret != GNUTLS_E_SUCCESS){

516

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

517

safer_gnutls_strerror(ret));

518

return -1;

519

}

520

609

521

if(debug){

610

522

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

611

523

* - GnuTLS manual

619

531

if(ret != GNUTLS_E_SUCCESS){

620

532

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

621

533

safer_gnutls_strerror(ret));

534

gnutls_global_deinit();

622

535

return -1;

623

536

}

624

537

649

562

safer_gnutls_strerror(ret));

650

563

goto globalfail;

651

564

}

652

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

653

if(dhparamsfilename != NULL){

654

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

655

do {

656

int dhpfile = open(dhparamsfilename, O_RDONLY);

657

if(dhpfile == -1){

658

perror_plus("open");

659

dhparamsfilename = NULL;

660

break;

661

}

662

size_t params_capacity = 0;

663

while(true){

664

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

665

(size_t)params.size,

666

(size_t)params_capacity);

667

if(params_capacity == 0){

668

perror_plus("incbuffer");

669

free(params.data);

670

params.data = NULL;

671

dhparamsfilename = NULL;

672

break;

673

}

674

ssize_t bytes_read = read(dhpfile,

675

params.data + params.size,

676

BUFFER_SIZE);

677

/* EOF */

678

if(bytes_read == 0){

679

break;

680

}

681

/* check bytes_read for failure */

682

if(bytes_read < 0){

683

perror_plus("read");

684

free(params.data);

685

params.data = NULL;

686

dhparamsfilename = NULL;

687

break;

688

}

689

params.size += (unsigned int)bytes_read;

690

}

691

ret = close(dhpfile);

692

if(ret == -1){

693

perror_plus("close");

694

}

695

if(params.data == NULL){

696

dhparamsfilename = NULL;

697

}

698

if(dhparamsfilename == NULL){

699

break;

700

}

701

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

702

GNUTLS_X509_FMT_PEM);

703

if(ret != GNUTLS_E_SUCCESS){

704

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

705

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

706

safer_gnutls_strerror(ret));

707

dhparamsfilename = NULL;

708

}

709

free(params.data);

710

} while(false);

711

}

712

if(dhparamsfilename == NULL){

713

if(mc->dh_bits == 0){

714

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

715

/* Try to read the private key file */

716

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

717

do {

718

int secfile = open(seckeyfilename, O_RDONLY);

719

if(secfile == -1){

720

perror_plus("open");

721

break;

722

}

723

size_t buffer_capacity = 0;

724

while(true){

725

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

726

(size_t)buffer.size,

727

(size_t)buffer_capacity);

728

if(buffer_capacity == 0){

729

perror_plus("incbuffer");

730

free(buffer.data);

731

buffer.data = NULL;

732

break;

733

}

734

ssize_t bytes_read = read(secfile,

735

buffer.data + buffer.size,

736

BUFFER_SIZE);

737

/* EOF */

738

if(bytes_read == 0){

739

break;

740

}

741

/* check bytes_read for failure */

742

if(bytes_read < 0){

743

perror_plus("read");

744

free(buffer.data);

745

buffer.data = NULL;

746

break;

747

}

748

buffer.size += (unsigned int)bytes_read;

749

}

750

close(secfile);

751

} while(false);

752

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

753

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

754

if(buffer.data != NULL){

755

{

756

gnutls_openpgp_privkey_t privkey = NULL;

757

ret = gnutls_openpgp_privkey_init(&privkey);

758

if(ret != GNUTLS_E_SUCCESS){

759

fprintf_plus(stderr, "Error initializing OpenPGP key"

760

" structure: %s",

761

safer_gnutls_strerror(ret));

762

free(buffer.data);

763

buffer.data = NULL;

764

} else {

765

ret = gnutls_openpgp_privkey_import

766

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

767

if(ret != GNUTLS_E_SUCCESS){

768

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

769

safer_gnutls_strerror(ret));

770

privkey = NULL;

771

}

772

free(buffer.data);

773

buffer.data = NULL;

774

if(privkey != NULL){

775

/* Use private key to suggest an appropriate

776

sec_param */

777

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

778

gnutls_openpgp_privkey_deinit(privkey);

779

if(debug){

780

fprintf_plus(stderr, "This OpenPGP key implies using"

781

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

782

safe_string(gnutls_sec_param_get_name

783

(sec_param)));

784

}

785

}

786

}

787

}

788

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

789

/* Err on the side of caution */

790

sec_param = GNUTLS_SEC_PARAM_ULTRA;

791

if(debug){

792

fprintf_plus(stderr, "Falling back to security parameter"

793

" \"%s\"\n",

794

safe_string(gnutls_sec_param_get_name

795

(sec_param)));

796

}

797

}

798

}

799

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

800

if(uret != 0){

801

mc->dh_bits = uret;

802

if(debug){

803

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

804

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

805

safe_string(gnutls_sec_param_get_name

806

(sec_param)),

807

mc->dh_bits);

808

}

809

} else {

810

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

811

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

812

safe_string(gnutls_sec_param_get_name

813

(sec_param)),

814

safer_gnutls_strerror(ret));

815

goto globalfail;

816

}

817

} else if(debug){

818

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

819

mc->dh_bits);

820

}

821

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

822

if(ret != GNUTLS_E_SUCCESS){

823

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

824

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

825

safer_gnutls_strerror(ret));

826

goto globalfail;

827

}

828

}

565

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

566

if(ret != GNUTLS_E_SUCCESS){

567

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

568

safer_gnutls_strerror(ret));

569

goto globalfail;

570

}

571

829

572

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

830

573

831

574

return 0;

833

576

globalfail:

834

577

835

578

gnutls_certificate_free_credentials(mc->cred);

579

gnutls_global_deinit();

836

580

gnutls_dh_params_deinit(mc->dh_params);

837

581

return -1;

838

582

}

890

634

/* ignore client certificate if any. */

891

635

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

892

636

637

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

638

893

639

return 0;

894

640

}

895

641

897

643

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

898

644

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

899

645

900

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

901

__attribute__((warn_unused_result))

902

int raise_privileges(void){

903

int old_errno = errno;

904

int ret = 0;

905

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

906

ret = errno;

907

}

908

errno = old_errno;

909

return ret;

910

}

911

912

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

913

__attribute__((warn_unused_result))

914

int raise_privileges_permanently(void){

915

int old_errno = errno;

916

int ret = raise_privileges();

917

if(ret != 0){

918

errno = old_errno;

919

return ret;

920

}

921

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

922

ret = errno;

923

}

924

errno = old_errno;

925

return ret;

926

}

927

928

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

929

__attribute__((warn_unused_result))

930

int lower_privileges(void){

931

int old_errno = errno;

932

int ret = 0;

933

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

934

ret = errno;

935

}

936

errno = old_errno;

937

return ret;

938

}

939

940

/* Lower privileges permanently */

941

__attribute__((warn_unused_result))

942

int lower_privileges_permanently(void){

943

int old_errno = errno;

944

int ret = 0;

945

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

946

ret = errno;

947

}

948

errno = old_errno;

949

return ret;

950

}

951

952

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

953

__attribute__((nonnull, warn_unused_result))

954

static bool add_delete_local_route(const bool add,

955

const char *address,

956

AvahiIfIndex if_index){

957

int ret;

958

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

959

char add_arg[] = "add";

960

char delete_arg[] = "delete";

961

char debug_flag[] = "--debug";

962

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

963

if(pluginhelperdir == NULL){

964

if(debug){

965

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

966

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

967

}

968

return false;

969

}

970

971

char interface[IF_NAMESIZE];

972

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

973

perror_plus("if_indextoname");

974

return false;

975

}

976

977

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

978

if(devnull == -1){

979

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

980

return false;

981

}

982

pid_t pid = fork();

983

if(pid == 0){

984

/* Child */

985

/* Raise privileges */

986

errno = raise_privileges_permanently();

987

if(errno != 0){

988

perror_plus("Failed to raise privileges");

989

/* _exit(EX_NOPERM); */

990

} else {

991

/* Set group */

992

errno = 0;

993

ret = setgid(0);

994

if(ret == -1){

995

perror_plus("setgid");

996

_exit(EX_NOPERM);

997

}

998

/* Reset supplementary groups */

999

errno = 0;

1000

ret = setgroups(0, NULL);

1001

if(ret == -1){

1002

perror_plus("setgroups");

1003

_exit(EX_NOPERM);

1004

}

1005

}

1006

ret = dup2(devnull, STDIN_FILENO);

1007

if(ret == -1){

1008

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

1009

_exit(EX_OSERR);

1010

}

1011

ret = close(devnull);

1012

if(ret == -1){

1013

perror_plus("close");

1014

_exit(EX_OSERR);

1015

}

1016

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1017

if(ret == -1){

1018

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

1019

_exit(EX_OSERR);

1020

}

1021

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

1022

O_RDONLY

1023

| O_DIRECTORY

1024

| O_PATH

1025

| O_CLOEXEC));

1026

if(helperdir_fd == -1){

1027

perror_plus("open");

1028

_exit(EX_UNAVAILABLE);

1029

}

1030

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

1031

helper, O_RDONLY));

1032

if(helper_fd == -1){

1033

perror_plus("openat");

1034

close(helperdir_fd);

1035

_exit(EX_UNAVAILABLE);

1036

}

1037

close(helperdir_fd);

1038

#ifdef __GNUC__

1039

#pragma GCC diagnostic push

1040

#pragma GCC diagnostic ignored "-Wcast-qual"

1041

#endif

1042

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

1043

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

1044

interface, debug ? debug_flag : NULL, NULL },

1045

environ) == -1){

1046

#ifdef __GNUC__

1047

#pragma GCC diagnostic pop

1048

#endif

1049

perror_plus("fexecve");

1050

_exit(EXIT_FAILURE);

1051

}

1052

}

1053

if(pid == -1){

1054

perror_plus("fork");

1055

return false;

1056

}

1057

int status;

1058

pid_t pret = -1;

1059

errno = 0;

1060

do {

1061

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

1062

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

1063

int errno_raising = 0;

1064

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

1065

errno_raising = errno;

1066

perror_plus("Failed to raise privileges in order to"

1067

" kill helper program");

1068

}

1069

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

1070

perror_plus("kill");

1071

}

1072

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

1073

perror_plus("Failed to lower privileges after killing"

1074

" helper program");

1075

}

1076

return false;

1077

}

1078

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

1079

if(pret == -1){

1080

perror_plus("waitpid");

1081

return false;

1082

}

1083

if(WIFEXITED(status)){

1084

if(WEXITSTATUS(status) != 0){

1085

fprintf_plus(stderr, "Error: iprouteadddel exited"

1086

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

1087

return false;

1088

}

1089

return true;

1090

}

1091

if(WIFSIGNALED(status)){

1092

fprintf_plus(stderr, "Error: iprouteadddel died by"

1093

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

1094

return false;

1095

}

1096

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

1097

return false;

1098

}

1099

1100

__attribute__((nonnull, warn_unused_result))

1101

static bool add_local_route(const char *address,

1102

AvahiIfIndex if_index){

1103

if(debug){

1104

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

1105

}

1106

return add_delete_local_route(true, address, if_index);

1107

}

1108

1109

__attribute__((nonnull, warn_unused_result))

1110

static bool delete_local_route(const char *address,

1111

AvahiIfIndex if_index){

1112

if(debug){

1113

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

1114

}

1115

return add_delete_local_route(false, address, if_index);

1116

}

1117

1118

646

/* Called when a Mandos server is found */

1119

647

__attribute__((nonnull, warn_unused_result))

1120

648

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

1131

659

int retval = -1;

1132

660

gnutls_session_t session;

1133

661

int pf; /* Protocol family */

1134

bool route_added = false;

1135

662

1136

663

errno = 0;

1137

664

1159

686

bool match = false;

1160

687

{

1161

688

char *interface = NULL;

1162

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

1163

mc->interfaces_size,

1164

interface))){

689

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

690

interface))){

1165

691

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

1166

692

match = true;

1167

693

break;

1196

722

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

1197

723

}

1198

724

1199

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

725

tcp_sd = socket(pf, SOCK_STREAM, 0);

1200

726

if(tcp_sd < 0){

1201

727

int e = errno;

1202

728

perror_plus("socket");

1209

735

goto mandos_end;

1210

736

}

1211

737

738

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

1212

739

if(af == AF_INET6){

1213

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

1214

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

1215

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

740

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

741

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

1216

742

} else { /* IPv4 */

1217

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

1218

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

1219

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

743

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

744

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

1220

745

}

1221

746

if(ret < 0 ){

1222

747

int e = errno;

1292

817

goto mandos_end;

1293

818

}

1294

819

1295

while(true){

1296

if(af == AF_INET6){

1297

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

1298

sizeof(struct sockaddr_in6));

1299

} else {

1300

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

1301

sizeof(struct sockaddr_in));

1302

}

1303

if(ret < 0){

1304

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

1305

and if_index != AVAHI_IF_UNSPEC

1306

and connect_to == NULL

1307

and not route_added and

1308

((af == AF_INET6 and not

1309

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1310

&to)->sin6_addr)))

1311

or (af == AF_INET and

1312

/* Not a a IPv4LL address */

1313

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

1314

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

1315

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

1316

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

1317

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

1318

connect to a Mandos server announced by Avahi on a server

1319

host with a global address. Work around this by retrying

1320

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

1321

1322

Avahi bug reference:

1323

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

1324

https://bugs.debian.org/587961

1325

*/

1326

if(debug){

1327

fprintf_plus(stderr, "Mandos server unreachable, trying"

1328

" direct route\n");

1329

}

1330

int e = errno;

1331

route_added = add_local_route(ip, if_index);

1332

if(route_added){

1333

continue;

1334

}

1335

errno = e;

1336

}

1337

if(errno != ECONNREFUSED or debug){

1338

int e = errno;

1339

perror_plus("connect");

1340

errno = e;

1341

}

1342

goto mandos_end;

1343

}

1344

1345

if(quit_now){

1346

errno = EINTR;

1347

goto mandos_end;

1348

}

1349

break;

820

if(af == AF_INET6){

821

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

822

sizeof(struct sockaddr_in6));

823

} else {

824

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

825

sizeof(struct sockaddr_in));

826

}

827

if(ret < 0){

828

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

829

int e = errno;

830

perror_plus("connect");

831

errno = e;

832

}

833

goto mandos_end;

834

}

835

836

if(quit_now){

837

errno = EINTR;

838

goto mandos_end;

1350

839

}

1351

840

1352

841

const char *out = mandos_protocol_version;

1506

995

&decrypted_buffer, mc);

1507

996

if(decrypted_buffer_size >= 0){

1508

997

1509

clearerr(stdout);

1510

998

written = 0;

1511

999

while(written < (size_t) decrypted_buffer_size){

1512

1000

if(quit_now){

1528

1016

}

1529

1017

written += (size_t)ret;

1530

1018

}

1531

ret = fflush(stdout);

1532

if(ret != 0){

1533

int e = errno;

1534

if(debug){

1535

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

1536

strerror(errno));

1537

}

1538

errno = e;

1539

goto mandos_end;

1540

}

1541

1019

retval = 0;

1542

1020

}

1543

1021

}

1546

1024

1547

1025

mandos_end:

1548

1026

{

1549

if(route_added){

1550

if(not delete_local_route(ip, if_index)){

1551

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

1552

" interface %d", ip, if_index);

1553

}

1554

}

1555

1027

int e = errno;

1556

1028

free(decrypted_buffer);

1557

1029

free(buffer);

1558

1030

if(tcp_sd >= 0){

1559

ret = close(tcp_sd);

1031

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

1560

1032

}

1561

1033

if(ret == -1){

1562

1034

if(e == 0){

1574

1046

return retval;

1575

1047

}

1576

1048

1049

__attribute__((nonnull))

1577

1050

static void resolve_callback(AvahiSServiceResolver *r,

1578

1051

AvahiIfIndex interface,

1579

1052

AvahiProtocol proto,

1596

1069

timed out */

1597

1070

1598

1071

if(quit_now){

1599

avahi_s_service_resolver_free(r);

1600

1072

return;

1601

1073

}

1602

1074

1716

1188

__attribute__((nonnull, warn_unused_result))

1717

1189

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

1718

1190

int ret;

1719

int old_errno;

1191

error_t ret_errno;

1720

1192

1721

1193

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

1722

1194

if(s < 0){

1723

old_errno = errno;

1195

ret_errno = errno;

1724

1196

perror_plus("socket");

1725

errno = old_errno;

1197

errno = ret_errno;

1726

1198

return false;

1727

1199

}

1728

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

1729

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

1200

strcpy(ifr->ifr_name, ifname);

1730

1201

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1731

1202

if(ret == -1){

1732

1203

if(debug){

1733

old_errno = errno;

1204

ret_errno = errno;

1734

1205

perror_plus("ioctl SIOCGIFFLAGS");

1735

errno = old_errno;

1736

}

1737

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

1738

old_errno = errno;

1739

perror_plus("close");

1740

errno = old_errno;

1206

errno = ret_errno;

1741

1207

}

1742

1208

return false;

1743

1209

}

1744

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

1745

old_errno = errno;

1746

perror_plus("close");

1747

errno = old_errno;

1748

}

1749

1210

return true;

1750

1211

}

1751

1212

1993

1454

}

1994

1455

}

1995

1456

1457

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

1458

__attribute__((warn_unused_result))

1459

error_t raise_privileges(void){

1460

error_t old_errno = errno;

1461

error_t ret_errno = 0;

1462

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

1463

ret_errno = errno;

1464

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

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

1470

__attribute__((warn_unused_result))

1471

error_t raise_privileges_permanently(void){

1472

error_t old_errno = errno;

1473

error_t ret_errno = raise_privileges();

1474

if(ret_errno != 0){

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

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

1479

ret_errno = errno;

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

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

1486

__attribute__((warn_unused_result))

1487

error_t lower_privileges(void){

1488

error_t old_errno = errno;

1489

error_t ret_errno = 0;

1490

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

1491

ret_errno = errno;

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1996

1509

__attribute__((nonnull))

1997

1510

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

1998

1511

const float delay){

1999

1512

struct dirent **direntries = NULL;

2000

1513

if(hookdir_fd == -1){

2001

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

2002

| O_CLOEXEC);

1514

hookdir_fd = open(hookdir, O_RDONLY);

2003

1515

if(hookdir_fd == -1){

2004

1516

if(errno == ENOENT){

2005

1517

if(debug){

2012

1524

return;

2013

1525

}

2014

1526

}

2015

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

2016

if(devnull == -1){

2017

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

2018

return;

2019

}

1527

#ifdef __GLIBC__

1528

#if __GLIBC_PREREQ(2, 15)

2020

1529

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

2021

1530

runnable_hook, alphasort);

1531

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

1532

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

1533

alphasort);

1534

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

1535

#else /* not __GLIBC__ */

1536

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

1537

alphasort);

1538

#endif /* not __GLIBC__ */

2022

1539

if(numhooks == -1){

2023

1540

perror_plus("scandir");

2024

close(devnull);

2025

1541

return;

2026

1542

}

2027

1543

struct dirent *direntry;

2028

1544

int ret;

1545

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

2029

1546

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

2030

1547

direntry = direntries[i];

2031

1548

if(debug){

2055

1572

perror_plus("setgroups");

2056

1573

_exit(EX_NOPERM);

2057

1574

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

2058

1590

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

2059

1591

if(ret == -1){

2060

1592

perror_plus("setenv");

2095

1627

_exit(EX_OSERR);

2096

1628

}

2097

1629

}

2098

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

2099

direntry->d_name,

2100

O_RDONLY));

1630

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

2101

1631

if(hook_fd == -1){

2102

1632

perror_plus("openat");

2103

1633

_exit(EXIT_FAILURE);

2104

1634

}

2105

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

1635

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

2106

1636

perror_plus("close");

2107

1637

_exit(EXIT_FAILURE);

2108

1638

}

2109

ret = dup2(devnull, STDIN_FILENO);

2110

if(ret == -1){

2111

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

2112

_exit(EX_OSERR);

2113

}

2114

ret = close(devnull);

2115

if(ret == -1){

2116

perror_plus("close");

2117

_exit(EX_OSERR);

2118

}

2119

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2120

if(ret == -1){

2121

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

2122

_exit(EX_OSERR);

2123

}

2124

1639

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

2125

1640

environ) == -1){

2126

1641

perror_plus("fexecve");

2127

1642

_exit(EXIT_FAILURE);

2128

1643

}

2129

1644

} else {

2130

if(hook_pid == -1){

2131

perror_plus("fork");

2132

free(direntry);

2133

continue;

2134

}

2135

1645

int status;

2136

1646

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

2137

1647

perror_plus("waitpid");

2138

free(direntry);

2139

1648

continue;

2140

1649

}

2141

1650

if(WIFEXITED(status)){

2143

1652

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

2144

1653

" with status %d\n", direntry->d_name,

2145

1654

WEXITSTATUS(status));

2146

free(direntry);

2147

1655

continue;

2148

1656

}

2149

1657

} else if(WIFSIGNALED(status)){

2150

1658

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

2151

1659

" signal %d\n", direntry->d_name,

2152

1660

WTERMSIG(status));

2153

free(direntry);

2154

1661

continue;

2155

1662

} else {

2156

1663

fprintf_plus(stderr, "Warning: network hook \"%s\""

2157

1664

" crashed\n", direntry->d_name);

2158

free(direntry);

2159

1665

continue;

2160

1666

}

2161

1667

}

2163

1669

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

2164

1670

direntry->d_name);

2165

1671

}

2166

free(direntry);

2167

1672

}

2168

1673

free(direntries);

2169

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

1674

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

2170

1675

perror_plus("close");

2171

1676

} else {

2172

1677

hookdir_fd = -1;

2175

1680

}

2176

1681

2177

1682

__attribute__((nonnull, warn_unused_result))

2178

int bring_up_interface(const char *const interface,

2179

const float delay){

2180

int old_errno = errno;

1683

error_t bring_up_interface(const char *const interface,

1684

const float delay){

1685

error_t old_errno = errno;

2181

1686

int ret;

2182

1687

struct ifreq network;

2183

1688

unsigned int if_index = if_nametoindex(interface);

2193

1698

}

2194

1699

2195

1700

if(not interface_is_up(interface)){

2196

int ret_errno = 0;

2197

int ioctl_errno = 0;

1701

error_t ret_errno = 0, ioctl_errno = 0;

2198

1702

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

2199

1703

ret_errno = errno;

2200

1704

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

2213

1717

}

2214

1718

2215

1719

if(quit_now){

2216

ret = close(sd);

1720

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

2217

1721

if(ret == -1){

2218

1722

perror_plus("close");

2219

1723

}

2269

1773

}

2270

1774

2271

1775

/* Close the socket */

2272

ret = close(sd);

1776

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

2273

1777

if(ret == -1){

2274

1778

perror_plus("close");

2275

1779

}

2287

1791

2288

1792

/* Sleep checking until interface is running.

2289

1793

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

2290

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

1794

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

2291

1795

if(interface_is_running(interface)){

2292

1796

break;

2293

1797

}

2303

1807

}

2304

1808

2305

1809

__attribute__((nonnull, warn_unused_result))

2306

int take_down_interface(const char *const interface){

2307

int old_errno = errno;

1810

error_t take_down_interface(const char *const interface){

1811

error_t old_errno = errno;

2308

1812

struct ifreq network;

2309

1813

unsigned int if_index = if_nametoindex(interface);

2310

1814

if(if_index == 0){

2313

1817

return ENXIO;

2314

1818

}

2315

1819

if(interface_is_up(interface)){

2316

int ret_errno = 0;

2317

int ioctl_errno = 0;

1820

error_t ret_errno = 0, ioctl_errno = 0;

2318

1821

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

2319

1822

ret_errno = errno;

2320

1823

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

2358

1861

}

2359

1862

2360

1863

/* Close the socket */

2361

int ret = close(sd);

1864

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

2362

1865

if(ret == -1){

2363

1866

perror_plus("close");

2364

1867

}

2379

1882

}

2380

1883

2381

1884

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

2382

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

2383

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

2384

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

2385

.current_server = NULL, .interfaces = NULL,

2386

.interfaces_size = 0 };

1885

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

1886

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

1887

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

1888

.interfaces = NULL, .interfaces_size = 0 };

2387

1889

AvahiSServiceBrowser *sb = NULL;

2388

1890

error_t ret_errno;

2389

1891

int ret;

2398

1900

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2399

1901

const char *seckey = PATHDIR "/" SECKEY;

2400

1902

const char *pubkey = PATHDIR "/" PUBKEY;

2401

const char *dh_params_file = NULL;

2402

1903

char *interfaces_hooks = NULL;

2403

1904

2404

1905

bool gnutls_initialized = false;

2457

1958

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

2458

1959

" Diffie-Hellman key exchange",

2459

1960

.group = 2 },

2460

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

2461

.arg = "FILE",

2462

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

2463

" for the Diffie-Hellman key exchange",

2464

.group = 2 },

2465

1961

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

2466

1962

.arg = "STRING",

2467

1963

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

2522

2018

}

2523

2019

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

2524

2020

break;

2525

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

2526

dh_params_file = arg;

2527

break;

2528

2021

case 130: /* --priority */

2529

2022

mc.priority = arg;

2530

2023

break;

2570

2063

.args_doc = "",

2571

2064

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

2572

2065

" passwords from a Mandos server" };

2573

ret_errno = argp_parse(&argp, argc, argv,

2574

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2575

switch(ret_errno){

2066

ret = argp_parse(&argp, argc, argv,

2067

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2068

switch(ret){

2576

2069

case 0:

2577

2070

break;

2578

2071

case ENOMEM:

2579

2072

default:

2580

errno = ret_errno;

2073

errno = ret;

2581

2074

perror_plus("argp_parse");

2582

2075

exitcode = EX_OSERR;

2583

2076

goto end;

2586

2079

goto end;

2587

2080

}

2588

2081

}

2589

2082

2590

2083

{

2591

2084

/* Work around Debian bug #633582:

2592

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

2085

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

2593

2086

2594

2087

/* Re-raise privileges */

2595

ret = raise_privileges();

2596

if(ret != 0){

2597

errno = ret;

2088

ret_errno = raise_privileges();

2089

if(ret_errno != 0){

2090

errno = ret_errno;

2598

2091

perror_plus("Failed to raise privileges");

2599

2092

} else {

2600

2093

struct stat st;

2616

2109

}

2617

2110

}

2618

2111

}

2619

close(seckey_fd);

2112

TEMP_FAILURE_RETRY(close(seckey_fd));

2620

2113

}

2621

2114

}

2622

2115

2623

2116

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

2624

2117

int pubkey_fd = open(pubkey, O_RDONLY);

2625

2118

if(pubkey_fd == -1){

2637

2130

}

2638

2131

}

2639

2132

}

2640

close(pubkey_fd);

2641

}

2642

}

2643

2644

if(dh_params_file != NULL

2645

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

2646

int dhparams_fd = open(dh_params_file, O_RDONLY);

2647

if(dhparams_fd == -1){

2648

perror_plus("open");

2649

} else {

2650

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

2651

if(ret == -1){

2652

perror_plus("fstat");

2653

} else {

2654

if(S_ISREG(st.st_mode)

2655

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

2656

ret = fchown(dhparams_fd, uid, gid);

2657

if(ret == -1){

2658

perror_plus("fchown");

2659

}

2660

}

2661

}

2662

close(dhparams_fd);

2663

}

2664

}

2665

2133

TEMP_FAILURE_RETRY(close(pubkey_fd));

2134

}

2135

}

2136

2666

2137

/* Lower privileges */

2667

ret = lower_privileges();

2668

if(ret != 0){

2669

errno = ret;

2138

ret_errno = lower_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2670

2141

perror_plus("Failed to lower privileges");

2671

2142

}

2672

2143

}

2797

2268

if(ret_errno != 0){

2798

2269

errno = ret_errno;

2799

2270

perror_plus("argz_add");

2800

free(direntries[i]);

2801

2271

continue;

2802

2272

}

2803

2273

if(debug){

2804

2274

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2805

2275

direntries[i]->d_name);

2806

2276

}

2807

free(direntries[i]);

2808

2277

}

2809

2278

free(direntries);

2810

2279

} else {

2842

2311

errno = bring_up_interface(interface, delay);

2843

2312

if(not interface_was_up){

2844

2313

if(errno != 0){

2845

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

2846

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

2314

perror_plus("Failed to bring up interface");

2847

2315

} else {

2848

2316

errno = argz_add(&interfaces_to_take_down,

2849

2317

&interfaces_to_take_down_size,

2872

2340

goto end;

2873

2341

}

2874

2342

2875

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

2343

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

2876

2344

if(ret == -1){

2877

2345

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

2878

2346

exitcode = EX_UNAVAILABLE;

3000

2468

3001

2469

/* Allocate a new server */

3002

2470

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

3003

&config, NULL, NULL, &ret);

2471

&config, NULL, NULL, &ret_errno);

3004

2472

3005

2473

/* Free the Avahi configuration data */

3006

2474

avahi_server_config_free(&config);

3009

2477

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

3010

2478

if(mc.server == NULL){

3011

2479

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

3012

avahi_strerror(ret));

2480

avahi_strerror(ret_errno));

3013

2481

exitcode = EX_UNAVAILABLE;

3014

2482

goto end;

3015

2483

}

3050

2518

end:

3051

2519

3052

2520

if(debug){

3053

if(signal_received){

3054

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

3055

argv[0], signal_received,

3056

strsignal(signal_received));

3057

} else {

3058

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

3059

}

2521

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

3060

2522

}

3061

2523

3062

2524

/* Cleanup things */

3073

2535

3074

2536

if(gnutls_initialized){

3075

2537

gnutls_certificate_free_credentials(mc.cred);

2538

gnutls_global_deinit();

3076

2539

gnutls_dh_params_deinit(mc.dh_params);

3077

2540

}

3078

2541

3086

2549

mc.current_server->prev->next = NULL;

3087

2550

while(mc.current_server != NULL){

3088

2551

server *next = mc.current_server->next;

3089

#ifdef __GNUC__

3090

#pragma GCC diagnostic push

3091

#pragma GCC diagnostic ignored "-Wcast-qual"

3092

#endif

3093

free((char *)(mc.current_server->ip));

3094

#ifdef __GNUC__

3095

#pragma GCC diagnostic pop

3096

#endif

3097

2552

free(mc.current_server);

3098

2553

mc.current_server = next;

3099

2554

}

3101

2556

3102

2557

/* Re-raise privileges */

3103

2558

{

3104

ret = raise_privileges();

3105

if(ret != 0){

3106

errno = ret;

2559

ret_errno = raise_privileges();

2560

if(ret_errno != 0){

2561

errno = ret_errno;

3107

2562

perror_plus("Failed to raise privileges");

3108

2563

} else {

3109

2564

3114

2569

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

3115

2570

{

3116

2571

char *interface = NULL;

3117

while((interface = argz_next(interfaces_to_take_down,

3118

interfaces_to_take_down_size,

3119

interface))){

3120

ret = take_down_interface(interface);

3121

if(ret != 0){

3122

errno = ret;

2572

while((interface=argz_next(interfaces_to_take_down,

2573

interfaces_to_take_down_size,

2574

interface))){

2575

ret_errno = take_down_interface(interface);

2576

if(ret_errno != 0){

2577

errno = ret_errno;

3123

2578

perror_plus("Failed to take down interface");

3124

2579

}

3125

2580

}

3130

2585

}

3131

2586

}

3132

2587

3133

ret = lower_privileges_permanently();

3134

if(ret != 0){

3135

errno = ret;

2588

ret_errno = lower_privileges_permanently();

2589

if(ret_errno != 0){

2590

errno = ret_errno;

3136

2591

perror_plus("Failed to lower privileges permanently");

3137

2592

}

3138

2593

}

3140

2595

free(interfaces_to_take_down);

3141

2596

free(interfaces_hooks);

3142

2597

3143

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

3144

uintmax_t level){

3145

struct dirent **direntries = NULL;

3146

int dret;

3147

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

3148

O_RDONLY

3149

| O_NOFOLLOW

3150

| O_DIRECTORY

3151

| O_PATH));

3152

if(dir_fd == -1){

3153

perror_plus("open");

3154

return;

3155

}

3156

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

3157

notdotentries, alphasort);

3158

if(numentries >= 0){

3159

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

3160

if(debug){

3161

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

3162

dirname, direntries[i]->d_name);

3163

}

3164

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

3165

if(dret == -1){

3166

if(errno == EISDIR){

3167

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

3168

AT_REMOVEDIR);

3169

}

3170

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

3171

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

3172

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

3173

/* Recurse only in this special case */

3174

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

3175

dret = 0;

3176

}

3177

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

3178

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

3179

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

3180

}

3181

}

3182

free(direntries[i]);

3183

}

3184

3185

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

3186

free(direntries);

3187

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3188

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

3189

perror_plus("rmdir");

3190

}

3191

} else {

3192

perror_plus("scandirat");

3193

}

3194

close(dir_fd);

3195

}

3196

3197

2598

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

3198

2599

if(tempdir != NULL){

3199

clean_dir_at(-1, tempdir, 0);

2600

struct dirent **direntries = NULL;

2601

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

2602

O_NOFOLLOW));

2603

if(tempdir_fd == -1){

2604

perror_plus("open");

2605

} else {

2606

#ifdef __GLIBC__

2607

#if __GLIBC_PREREQ(2, 15)

2608

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

2609

notdotentries, alphasort);

2610

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

2611

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

2612

alphasort);

2613

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

2614

#else /* not __GLIBC__ */

2615

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

2616

alphasort);

2617

#endif /* not __GLIBC__ */

2618

if(numentries >= 0){

2619

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

2620

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

2621

if(ret == -1){

2622

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

2623

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

2624

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

2625

}

2626

}

2627

2628

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

2629

free(direntries);

2630

if(numentries == -1){

2631

perror_plus("scandir");

2632

}

2633

ret = rmdir(tempdir);

2634

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

2635

perror_plus("rmdir");

2636

}

2637

}

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

2639

}

3200

2640

}

3201

2641

3202

2642

if(quit_now){