/mandos/release : revision 237.7.304

9

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

10

*

11

* Everything else is

12

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,

311

305

return false;

312

306

}

313

307

314

ret = close(fd);

308

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

315

309

if(ret == -1){

316

310

perror_plus("close");

317

311

}

356

350

/* Create new GPGME "context" */

357

351

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

358

352

if(rc != GPG_ERR_NO_ERROR){

359

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

360

gpgme_strsource(rc), gpgme_strerror(rc));

353

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

354

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

355

gpgme_strerror(rc));

361

356

return false;

362

357

}

363

358

399

394

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

400

395

rc = gpgme_data_new(&dh_plain);

401

396

if(rc != GPG_ERR_NO_ERROR){

402

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

397

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

398

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

403

399

gpgme_strsource(rc), gpgme_strerror(rc));

404

400

gpgme_data_release(dh_crypto);

405

401

return -1;

418

414

if(result == NULL){

419

415

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

420

416

} else {

421

if(result->unsupported_algorithm != NULL) {

422

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

423

result->unsupported_algorithm);

424

}

425

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

426

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

417

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

418

result->unsupported_algorithm);

419

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

420

result->wrong_key_usage);

427

421

if(result->file_name != NULL){

428

422

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

429

423

}

519

513

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

520

514

}

521

515

522

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

516

__attribute__((nonnull, warn_unused_result))

523

517

static int init_gnutls_global(const char *pubkeyfilename,

524

518

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

519

mandos_context *mc){

527

520

int ret;

528

521

unsigned int uret;

531

524

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

532

525

}

533

526

527

ret = gnutls_global_init();

528

if(ret != GNUTLS_E_SUCCESS){

529

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

530

safer_gnutls_strerror(ret));

531

return -1;

532

}

533

534

if(debug){

535

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

536

* - GnuTLS manual

544

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

547

gnutls_global_deinit();

547

548

return -1;

548

549

}

549

550

574

575

safer_gnutls_strerror(ret));

575

576

goto globalfail;

576

577

}

577

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

578

if(dhparamsfilename != NULL){

579

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

580

do {

581

int dhpfile = open(dhparamsfilename, O_RDONLY);

582

if(dhpfile == -1){

583

perror_plus("open");

584

dhparamsfilename = NULL;

585

break;

586

}

587

size_t params_capacity = 0;

578

if(mc->dh_bits == 0){

579

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

580

/* Try to read the private key file */

581

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

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

588

585

while(true){

589

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

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

593

590

perror_plus("incbuffer");

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

591

free(buffer.data);

592

buffer.data = NULL;

597

593

break;

598

594

}

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

595

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

601

596

BUFFER_SIZE);

602

597

/* EOF */

603

598

if(bytes_read == 0){

606

601

/* check bytes_read for failure */

607

602

if(bytes_read < 0){

608

603

perror_plus("read");

609

free(params.data);

610

params.data = NULL;

611

dhparamsfilename = NULL;

612

break;

613

}

614

params.size += (unsigned int)bytes_read;

615

}

616

ret = close(dhpfile);

617

if(ret == -1){

618

perror_plus("close");

619

}

620

if(params.data == NULL){

621

dhparamsfilename = NULL;

622

}

623

if(dhparamsfilename == NULL){

624

break;

625

}

626

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

627

GNUTLS_X509_FMT_PEM);

628

if(ret != GNUTLS_E_SUCCESS){

629

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

630

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

631

safer_gnutls_strerror(ret));

632

dhparamsfilename = NULL;

633

}

634

free(params.data);

635

} while(false);

636

}

637

if(dhparamsfilename == NULL){

638

if(mc->dh_bits == 0){

639

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

640

/* Try to read the private key file */

641

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

642

do {

643

int secfile = open(seckeyfilename, O_RDONLY);

644

if(secfile == -1){

645

perror_plus("open");

646

break;

647

}

648

size_t buffer_capacity = 0;

649

while(true){

650

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

651

(size_t)buffer.size,

652

(size_t)buffer_capacity);

653

if(buffer_capacity == 0){

654

perror_plus("incbuffer");

655

free(buffer.data);

656

buffer.data = NULL;

657

break;

658

}

659

ssize_t bytes_read = read(secfile,

660

buffer.data + buffer.size,

661

BUFFER_SIZE);

662

/* EOF */

663

if(bytes_read == 0){

664

break;

665

}

666

/* check bytes_read for failure */

667

if(bytes_read < 0){

668

perror_plus("read");

669

free(buffer.data);

670

buffer.data = NULL;

671

break;

672

}

673

buffer.size += (unsigned int)bytes_read;

674

}

675

close(secfile);

676

} while(false);

677

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

678

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

679

if(buffer.data != NULL){

680

{

681

gnutls_openpgp_privkey_t privkey = NULL;

682

ret = gnutls_openpgp_privkey_init(&privkey);

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

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

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

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

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

683

627

if(ret != GNUTLS_E_SUCCESS){

684

fprintf_plus(stderr, "Error initializing OpenPGP key"

685

" structure: %s",

628

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

686

629

safer_gnutls_strerror(ret));

687

free(buffer.data);

688

buffer.data = NULL;

689

} else {

690

ret = gnutls_openpgp_privkey_import

691

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

692

if(ret != GNUTLS_E_SUCCESS){

693

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

694

safer_gnutls_strerror(ret));

695

privkey = NULL;

696

}

697

free(buffer.data);

698

buffer.data = NULL;

699

if(privkey != NULL){

700

/* Use private key to suggest an appropriate

701

sec_param */

702

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

703

gnutls_openpgp_privkey_deinit(privkey);

704

if(debug){

705

fprintf_plus(stderr, "This OpenPGP key implies using"

706

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

707

safe_string(gnutls_sec_param_get_name

708

(sec_param)));

709

}

710

}

630

privkey = NULL;

711

631

}

712

}

713

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

714

/* Err on the side of caution */

715

sec_param = GNUTLS_SEC_PARAM_ULTRA;

716

if(debug){

717

fprintf_plus(stderr, "Falling back to security parameter"

718

" \"%s\"\n",

719

safe_string(gnutls_sec_param_get_name

720

(sec_param)));

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

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

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

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

640

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

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

721

644

}

722

645

}

723

646

}

724

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

725

if(uret != 0){

726

mc->dh_bits = uret;

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

727

650

if(debug){

728

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

729

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

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

730

653

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

mc->dh_bits);

654

(sec_param)));

733

655

}

734

} else {

735

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

736

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

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

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

663

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

737

664

safe_string(gnutls_sec_param_get_name

738

665

(sec_param)),

739

safer_gnutls_strerror(ret));

740

goto globalfail;

666

mc->dh_bits);

741

667

}

742

} else if(debug){

743

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

744

mc->dh_bits);

745

}

746

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

747

if(ret != GNUTLS_E_SUCCESS){

748

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

749

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

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)),

750

672

safer_gnutls_strerror(ret));

751

673

goto globalfail;

752

674

}

753

}

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

754

686

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

755

687

756

688

return 0;

758

690

globalfail:

759

691

760

692

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

761

694

gnutls_dh_params_deinit(mc->dh_params);

762

695

return -1;

763

696

}

815

748

/* ignore client certificate if any. */

816

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

817

750

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

818

753

return 0;

819

754

}

820

755

822

757

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

823

758

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

824

759

825

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

826

__attribute__((warn_unused_result))

827

int raise_privileges(void){

828

int old_errno = errno;

829

int ret = 0;

830

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

831

ret = errno;

832

}

833

errno = old_errno;

834

return ret;

835

}

836

837

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

838

__attribute__((warn_unused_result))

839

int raise_privileges_permanently(void){

840

int old_errno = errno;

841

int ret = raise_privileges();

842

if(ret != 0){

843

errno = old_errno;

844

return ret;

845

}

846

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

847

ret = errno;

848

}

849

errno = old_errno;

850

return ret;

851

}

852

853

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

854

__attribute__((warn_unused_result))

855

int lower_privileges(void){

856

int old_errno = errno;

857

int ret = 0;

858

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

859

ret = errno;

860

}

861

errno = old_errno;

862

return ret;

863

}

864

865

/* Lower privileges permanently */

866

__attribute__((warn_unused_result))

867

int lower_privileges_permanently(void){

868

int old_errno = errno;

869

int ret = 0;

870

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

871

ret = errno;

872

}

873

errno = old_errno;

874

return ret;

875

}

876

877

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

878

__attribute__((nonnull, warn_unused_result))

879

static bool add_delete_local_route(const bool add,

880

const char *address,

881

AvahiIfIndex if_index){

882

int ret;

883

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

884

char add_arg[] = "add";

885

char delete_arg[] = "delete";

886

char debug_flag[] = "--debug";

887

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

888

if(pluginhelperdir == NULL){

889

if(debug){

890

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

891

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

892

}

893

return false;

894

}

895

896

char interface[IF_NAMESIZE];

897

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

898

perror_plus("if_indextoname");

899

return false;

900

}

901

902

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

903

if(devnull == -1){

904

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

905

return false;

906

}

907

pid_t pid = fork();

908

if(pid == 0){

909

/* Child */

910

/* Raise privileges */

911

errno = raise_privileges_permanently();

912

if(errno != 0){

913

perror_plus("Failed to raise privileges");

914

/* _exit(EX_NOPERM); */

915

} else {

916

/* Set group */

917

errno = 0;

918

ret = setgid(0);

919

if(ret == -1){

920

perror_plus("setgid");

921

_exit(EX_NOPERM);

922

}

923

/* Reset supplementary groups */

924

errno = 0;

925

ret = setgroups(0, NULL);

926

if(ret == -1){

927

perror_plus("setgroups");

928

_exit(EX_NOPERM);

929

}

930

}

931

ret = dup2(devnull, STDIN_FILENO);

932

if(ret == -1){

933

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

934

_exit(EX_OSERR);

935

}

936

ret = close(devnull);

937

if(ret == -1){

938

perror_plus("close");

939

_exit(EX_OSERR);

940

}

941

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

942

if(ret == -1){

943

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

944

_exit(EX_OSERR);

945

}

946

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

947

O_RDONLY

948

| O_DIRECTORY

949

| O_PATH

950

| O_CLOEXEC));

951

if(helperdir_fd == -1){

952

perror_plus("open");

953

_exit(EX_UNAVAILABLE);

954

}

955

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

956

helper, O_RDONLY));

957

if(helper_fd == -1){

958

perror_plus("openat");

959

close(helperdir_fd);

960

_exit(EX_UNAVAILABLE);

961

}

962

close(helperdir_fd);

963

#ifdef __GNUC__

964

#pragma GCC diagnostic push

965

#pragma GCC diagnostic ignored "-Wcast-qual"

966

#endif

967

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

968

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

969

interface, debug ? debug_flag : NULL, NULL },

970

environ) == -1){

971

#ifdef __GNUC__

972

#pragma GCC diagnostic pop

973

#endif

974

perror_plus("fexecve");

975

_exit(EXIT_FAILURE);

976

}

977

}

978

if(pid == -1){

979

perror_plus("fork");

980

return false;

981

}

982

int status;

983

pid_t pret = -1;

984

errno = 0;

985

do {

986

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

987

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

988

int errno_raising = 0;

989

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

990

errno_raising = errno;

991

perror_plus("Failed to raise privileges in order to"

992

" kill helper program");

993

}

994

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

995

perror_plus("kill");

996

}

997

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

998

perror_plus("Failed to lower privileges after killing"

999

" helper program");

1000

}

1001

return false;

1002

}

1003

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

1004

if(pret == -1){

1005

perror_plus("waitpid");

1006

return false;

1007

}

1008

if(WIFEXITED(status)){

1009

if(WEXITSTATUS(status) != 0){

1010

fprintf_plus(stderr, "Error: iprouteadddel exited"

1011

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

1012

return false;

1013

}

1014

return true;

1015

}

1016

if(WIFSIGNALED(status)){

1017

fprintf_plus(stderr, "Error: iprouteadddel died by"

1018

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

1019

return false;

1020

}

1021

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

1022

return false;

1023

}

1024

1025

__attribute__((nonnull, warn_unused_result))

1026

static bool add_local_route(const char *address,

1027

AvahiIfIndex if_index){

1028

if(debug){

1029

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

1030

}

1031

return add_delete_local_route(true, address, if_index);

1032

}

1033

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool delete_local_route(const char *address,

1036

AvahiIfIndex if_index){

1037

if(debug){

1038

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

1039

}

1040

return add_delete_local_route(false, address, if_index);

1041

}

1042

1043

760

/* Called when a Mandos server is found */

1044

761

__attribute__((nonnull, warn_unused_result))

1045

762

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

1056

773

int retval = -1;

1057

774

gnutls_session_t session;

1058

775

int pf; /* Protocol family */

1059

bool route_added = false;

1060

776

1061

777

errno = 0;

1062

778

1084

800

bool match = false;

1085

801

{

1086

802

char *interface = NULL;

1087

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

1088

mc->interfaces_size,

1089

interface))){

803

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

804

interface))){

1090

805

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

1091

806

match = true;

1092

807

break;

1121

836

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

1122

837

}

1123

838

1124

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

839

tcp_sd = socket(pf, SOCK_STREAM, 0);

1125

840

if(tcp_sd < 0){

1126

841

int e = errno;

1127

842

perror_plus("socket");

1134

849

goto mandos_end;

1135

850

}

1136

851

852

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

1137

853

if(af == AF_INET6){

1138

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

1139

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

1140

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

854

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

855

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

1141

856

} else { /* IPv4 */

1142

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

1143

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

1144

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

857

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

858

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

1145

859

}

1146

860

if(ret < 0 ){

1147

861

int e = errno;

1217

931

goto mandos_end;

1218

932

}

1219

933

1220

while(true){

1221

if(af == AF_INET6){

1222

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

1223

sizeof(struct sockaddr_in6));

1224

} else {

1225

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

1226

sizeof(struct sockaddr_in));

1227

}

1228

if(ret < 0){

1229

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

1230

and if_index != AVAHI_IF_UNSPEC

1231

and connect_to == NULL

1232

and not route_added and

1233

((af == AF_INET6 and not

1234

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1235

&to)->sin6_addr)))

1236

or (af == AF_INET and

1237

/* Not a a IPv4LL address */

1238

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

1239

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

1240

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

1241

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

1242

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

1243

connect to a Mandos server announced by Avahi on a server

1244

host with a global address. Work around this by retrying

1245

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

1246

1247

Avahi bug reference:

1248

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

1249

https://bugs.debian.org/587961

1250

*/

1251

if(debug){

1252

fprintf_plus(stderr, "Mandos server unreachable, trying"

1253

" direct route\n");

1254

}

1255

int e = errno;

1256

route_added = add_local_route(ip, if_index);

1257

if(route_added){

1258

continue;

1259

}

1260

errno = e;

1261

}

1262

if(errno != ECONNREFUSED or debug){

1263

int e = errno;

1264

perror_plus("connect");

1265

errno = e;

1266

}

1267

goto mandos_end;

1268

}

1269

1270

if(quit_now){

1271

errno = EINTR;

1272

goto mandos_end;

1273

}

1274

break;

934

if(af == AF_INET6){

935

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

936

sizeof(struct sockaddr_in6));

937

} else {

938

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

939

sizeof(struct sockaddr_in));

940

}

941

if(ret < 0){

942

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

943

int e = errno;

944

perror_plus("connect");

945

errno = e;

946

}

947

goto mandos_end;

948

}

949

950

if(quit_now){

951

errno = EINTR;

952

goto mandos_end;

1275

953

}

1276

954

1277

955

const char *out = mandos_protocol_version;

1431

1109

&decrypted_buffer, mc);

1432

1110

if(decrypted_buffer_size >= 0){

1433

1111

1434

clearerr(stdout);

1435

1112

written = 0;

1436

1113

while(written < (size_t) decrypted_buffer_size){

1437

1114

if(quit_now){

1453

1130

}

1454

1131

written += (size_t)ret;

1455

1132

}

1456

ret = fflush(stdout);

1457

if(ret != 0){

1458

int e = errno;

1459

if(debug){

1460

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

1461

strerror(errno));

1462

}

1463

errno = e;

1464

goto mandos_end;

1465

}

1466

1133

retval = 0;

1467

1134

}

1468

1135

}

1471

1138

1472

1139

mandos_end:

1473

1140

{

1474

if(route_added){

1475

if(not delete_local_route(ip, if_index)){

1476

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

1477

" interface %d", ip, if_index);

1478

}

1479

}

1480

1141

int e = errno;

1481

1142

free(decrypted_buffer);

1482

1143

free(buffer);

1483

1144

if(tcp_sd >= 0){

1484

ret = close(tcp_sd);

1145

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

1485

1146

}

1486

1147

if(ret == -1){

1487

1148

if(e == 0){

1499

1160

return retval;

1500

1161

}

1501

1162

1163

__attribute__((nonnull))

1502

1164

static void resolve_callback(AvahiSServiceResolver *r,

1503

1165

AvahiIfIndex interface,

1504

1166

AvahiProtocol proto,

1641

1303

__attribute__((nonnull, warn_unused_result))

1642

1304

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

1643

1305

int ret;

1644

int old_errno;

1306

error_t ret_errno;

1645

1307

1646

1308

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

1647

1309

if(s < 0){

1648

old_errno = errno;

1310

ret_errno = errno;

1649

1311

perror_plus("socket");

1650

errno = old_errno;

1312

errno = ret_errno;

1651

1313

return false;

1652

1314

}

1653

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

1654

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

1315

strcpy(ifr->ifr_name, ifname);

1655

1316

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1656

1317

if(ret == -1){

1657

1318

if(debug){

1658

old_errno = errno;

1319

ret_errno = errno;

1659

1320

perror_plus("ioctl SIOCGIFFLAGS");

1660

errno = old_errno;

1661

}

1662

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

1663

old_errno = errno;

1664

perror_plus("close");

1665

errno = old_errno;

1321

errno = ret_errno;

1666

1322

}

1667

1323

return false;

1668

1324

}

1669

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

1670

old_errno = errno;

1671

perror_plus("close");

1672

errno = old_errno;

1673

}

1674

1325

return true;

1675

1326

}

1676

1327

1918

1569

}

1919

1570

}

1920

1571

1572

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

1573

__attribute__((warn_unused_result))

1574

error_t raise_privileges(void){

1575

error_t old_errno = errno;

1576

error_t ret_errno = 0;

1577

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

1578

ret_errno = errno;

1579

}

1580

errno = old_errno;

1581

return ret_errno;

1582

}

1583

1584

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

1585

__attribute__((warn_unused_result))

1586

error_t raise_privileges_permanently(void){

1587

error_t old_errno = errno;

1588

error_t ret_errno = raise_privileges();

1589

if(ret_errno != 0){

1590

errno = old_errno;

1591

return ret_errno;

1592

}

1593

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

1594

ret_errno = errno;

1595

}

1596

errno = old_errno;

1597

return ret_errno;

1598

}

1599

1600

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

1601

__attribute__((warn_unused_result))

1602

error_t lower_privileges(void){

1603

error_t old_errno = errno;

1604

error_t ret_errno = 0;

1605

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

1606

ret_errno = errno;

1607

}

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

1612

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1614

error_t lower_privileges_permanently(void){

1615

error_t old_errno = errno;

1616

error_t ret_errno = 0;

1617

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

1618

ret_errno = errno;

1619

}

1620

errno = old_errno;

1621

return ret_errno;

1622

}

1623

1921

1624

__attribute__((nonnull))

1922

1625

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

1923

1626

const float delay){

1924

1627

struct dirent **direntries = NULL;

1925

1628

if(hookdir_fd == -1){

1926

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1927

| O_CLOEXEC);

1629

hookdir_fd = open(hookdir, O_RDONLY);

1928

1630

if(hookdir_fd == -1){

1929

1631

if(errno == ENOENT){

1930

1632

if(debug){

1937

1639

return;

1938

1640

}

1939

1641

}

1940

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

1941

if(devnull == -1){

1942

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

1943

return;

1944

}

1642

#ifdef __GLIBC__

1643

#if __GLIBC_PREREQ(2, 15)

1945

1644

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

1946

1645

runnable_hook, alphasort);

1646

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

1647

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

1648

alphasort);

1649

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

1650

#else /* not __GLIBC__ */

1651

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

1652

alphasort);

1653

#endif /* not __GLIBC__ */

1947

1654

if(numhooks == -1){

1948

1655

perror_plus("scandir");

1949

close(devnull);

1950

1656

return;

1951

1657

}

1952

1658

struct dirent *direntry;

1953

1659

int ret;

1660

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

1954

1661

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

1955

1662

direntry = direntries[i];

1956

1663

if(debug){

1980

1687

perror_plus("setgroups");

1981

1688

_exit(EX_NOPERM);

1982

1689

}

1690

ret = dup2(devnull, STDIN_FILENO);

1691

if(ret == -1){

1692

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

1693

_exit(EX_OSERR);

1694

}

1695

ret = close(devnull);

1696

if(ret == -1){

1697

perror_plus("close");

1698

_exit(EX_OSERR);

1699

}

1700

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1701

if(ret == -1){

1702

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

1703

_exit(EX_OSERR);

1704

}

1983

1705

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

1984

1706

if(ret == -1){

1985

1707

perror_plus("setenv");

2020

1742

_exit(EX_OSERR);

2021

1743

}

2022

1744

}

2023

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

2024

direntry->d_name,

2025

O_RDONLY));

1745

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

2026

1746

if(hook_fd == -1){

2027

1747

perror_plus("openat");

2028

1748

_exit(EXIT_FAILURE);

2029

1749

}

2030

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

1750

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

2031

1751

perror_plus("close");

2032

1752

_exit(EXIT_FAILURE);

2033

1753

}

2034

ret = dup2(devnull, STDIN_FILENO);

2035

if(ret == -1){

2036

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

2037

_exit(EX_OSERR);

2038

}

2039

ret = close(devnull);

2040

if(ret == -1){

2041

perror_plus("close");

2042

_exit(EX_OSERR);

2043

}

2044

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2045

if(ret == -1){

2046

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

2047

_exit(EX_OSERR);

2048

}

2049

1754

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

2050

1755

environ) == -1){

2051

1756

perror_plus("fexecve");

2091

1796

free(direntry);

2092

1797

}

2093

1798

free(direntries);

2094

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

1799

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

2095

1800

perror_plus("close");

2096

1801

} else {

2097

1802

hookdir_fd = -1;

2100

1805

}

2101

1806

2102

1807

__attribute__((nonnull, warn_unused_result))

2103

int bring_up_interface(const char *const interface,

2104

const float delay){

2105

int old_errno = errno;

1808

error_t bring_up_interface(const char *const interface,

1809

const float delay){

1810

error_t old_errno = errno;

2106

1811

int ret;

2107

1812

struct ifreq network;

2108

1813

unsigned int if_index = if_nametoindex(interface);

2118

1823

}

2119

1824

2120

1825

if(not interface_is_up(interface)){

2121

int ret_errno = 0;

2122

int ioctl_errno = 0;

1826

error_t ret_errno = 0, ioctl_errno = 0;

2123

1827

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

2124

1828

ret_errno = errno;

2125

1829

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

2138

1842

}

2139

1843

2140

1844

if(quit_now){

2141

ret = close(sd);

1845

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

2142

1846

if(ret == -1){

2143

1847

perror_plus("close");

2144

1848

}

2194

1898

}

2195

1899

2196

1900

/* Close the socket */

2197

ret = close(sd);

1901

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

2198

1902

if(ret == -1){

2199

1903

perror_plus("close");

2200

1904

}

2212

1916

2213

1917

/* Sleep checking until interface is running.

2214

1918

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

2215

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

1919

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

2216

1920

if(interface_is_running(interface)){

2217

1921

break;

2218

1922

}

2228

1932

}

2229

1933

2230

1934

__attribute__((nonnull, warn_unused_result))

2231

int take_down_interface(const char *const interface){

2232

int old_errno = errno;

1935

error_t take_down_interface(const char *const interface){

1936

error_t old_errno = errno;

2233

1937

struct ifreq network;

2234

1938

unsigned int if_index = if_nametoindex(interface);

2235

1939

if(if_index == 0){

2238

1942

return ENXIO;

2239

1943

}

2240

1944

if(interface_is_up(interface)){

2241

int ret_errno = 0;

2242

int ioctl_errno = 0;

1945

error_t ret_errno = 0, ioctl_errno = 0;

2243

1946

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

2244

1947

ret_errno = errno;

2245

1948

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

2283

1986

}

2284

1987

2285

1988

/* Close the socket */

2286

int ret = close(sd);

1989

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

2287

1990

if(ret == -1){

2288

1991

perror_plus("close");

2289

1992

}

2305

2008

2306

2009

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

2307

2010

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

2308

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

2309

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

2310

.current_server = NULL, .interfaces = NULL,

2311

.interfaces_size = 0 };

2011

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

2012

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

2013

.interfaces = NULL, .interfaces_size = 0 };

2312

2014

AvahiSServiceBrowser *sb = NULL;

2313

2015

error_t ret_errno;

2314

2016

int ret;

2323

2025

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2324

2026

const char *seckey = PATHDIR "/" SECKEY;

2325

2027

const char *pubkey = PATHDIR "/" PUBKEY;

2326

const char *dh_params_file = NULL;

2327

2028

char *interfaces_hooks = NULL;

2328

2029

2329

2030

bool gnutls_initialized = false;

2382

2083

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

2383

2084

" Diffie-Hellman key exchange",

2384

2085

.group = 2 },

2385

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

2386

.arg = "FILE",

2387

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

2388

" for the Diffie-Hellman key exchange",

2389

.group = 2 },

2390

2086

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

2391

2087

.arg = "STRING",

2392

2088

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

2447

2143

}

2448

2144

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

2449

2145

break;

2450

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

2451

dh_params_file = arg;

2452

break;

2453

2146

case 130: /* --priority */

2454

2147

mc.priority = arg;

2455

2148

break;

2495

2188

.args_doc = "",

2496

2189

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

2497

2190

" passwords from a Mandos server" };

2498

ret_errno = argp_parse(&argp, argc, argv,

2499

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2500

switch(ret_errno){

2191

ret = argp_parse(&argp, argc, argv,

2192

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2193

switch(ret){

2501

2194

case 0:

2502

2195

break;

2503

2196

case ENOMEM:

2504

2197

default:

2505

errno = ret_errno;

2198

errno = ret;

2506

2199

perror_plus("argp_parse");

2507

2200

exitcode = EX_OSERR;

2508

2201

goto end;

2511

2204

goto end;

2512

2205

}

2513

2206

}

2514

2207

2515

2208

{

2516

2209

/* Work around Debian bug #633582:

2517

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

2210

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

2518

2211

2519

2212

/* Re-raise privileges */

2520

ret = raise_privileges();

2521

if(ret != 0){

2522

errno = ret;

2213

ret_errno = raise_privileges();

2214

if(ret_errno != 0){

2215

errno = ret_errno;

2523

2216

perror_plus("Failed to raise privileges");

2524

2217

} else {

2525

2218

struct stat st;

2541

2234

}

2542

2235

}

2543

2236

}

2544

close(seckey_fd);

2237

TEMP_FAILURE_RETRY(close(seckey_fd));

2545

2238

}

2546

2239

}

2547

2240

2548

2241

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

2549

2242

int pubkey_fd = open(pubkey, O_RDONLY);

2550

2243

if(pubkey_fd == -1){

2562

2255

}

2563

2256

}

2564

2257

}

2565

close(pubkey_fd);

2566

}

2567

}

2568

2569

if(dh_params_file != NULL

2570

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

2571

int dhparams_fd = open(dh_params_file, O_RDONLY);

2572

if(dhparams_fd == -1){

2573

perror_plus("open");

2574

} else {

2575

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

2576

if(ret == -1){

2577

perror_plus("fstat");

2578

} else {

2579

if(S_ISREG(st.st_mode)

2580

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

2581

ret = fchown(dhparams_fd, uid, gid);

2582

if(ret == -1){

2583

perror_plus("fchown");

2584

}

2585

}

2586

}

2587

close(dhparams_fd);

2588

}

2589

}

2590

2258

TEMP_FAILURE_RETRY(close(pubkey_fd));

2259

}

2260

}

2261

2591

2262

/* Lower privileges */

2592

ret = lower_privileges();

2593

if(ret != 0){

2594

errno = ret;

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2595

2266

perror_plus("Failed to lower privileges");

2596

2267

}

2597

2268

}

2767

2438

errno = bring_up_interface(interface, delay);

2768

2439

if(not interface_was_up){

2769

2440

if(errno != 0){

2770

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

2771

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

2441

perror_plus("Failed to bring up interface");

2772

2442

} else {

2773

2443

errno = argz_add(&interfaces_to_take_down,

2774

2444

&interfaces_to_take_down_size,

2797

2467

goto end;

2798

2468

}

2799

2469

2800

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

2470

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

2801

2471

if(ret == -1){

2802

2472

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

2803

2473

exitcode = EX_UNAVAILABLE;

2925

2595

2926

2596

/* Allocate a new server */

2927

2597

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2928

&config, NULL, NULL, &ret);

2598

&config, NULL, NULL, &ret_errno);

2929

2599

2930

2600

/* Free the Avahi configuration data */

2931

2601

avahi_server_config_free(&config);

2934

2604

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

2935

2605

if(mc.server == NULL){

2936

2606

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

2937

avahi_strerror(ret));

2607

avahi_strerror(ret_errno));

2938

2608

exitcode = EX_UNAVAILABLE;

2939

2609

goto end;

2940

2610

}

2975

2645

end:

2976

2646

2977

2647

if(debug){

2978

if(signal_received){

2979

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

2980

argv[0], signal_received,

2981

strsignal(signal_received));

2982

} else {

2983

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

2984

}

2648

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

2985

2649

}

2986

2650

2987

2651

/* Cleanup things */

2998

2662

2999

2663

if(gnutls_initialized){

3000

2664

gnutls_certificate_free_credentials(mc.cred);

2665

gnutls_global_deinit();

3001

2666

gnutls_dh_params_deinit(mc.dh_params);

3002

2667

}

3003

2668

3026

2691

3027

2692

/* Re-raise privileges */

3028

2693

{

3029

ret = raise_privileges();

3030

if(ret != 0){

3031

errno = ret;

2694

ret_errno = raise_privileges();

2695

if(ret_errno != 0){

2696

errno = ret_errno;

3032

2697

perror_plus("Failed to raise privileges");

3033

2698

} else {

3034

2699

3039

2704

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

3040

2705

{

3041

2706

char *interface = NULL;

3042

while((interface = argz_next(interfaces_to_take_down,

3043

interfaces_to_take_down_size,

3044

interface))){

3045

ret = take_down_interface(interface);

3046

if(ret != 0){

3047

errno = ret;

2707

while((interface=argz_next(interfaces_to_take_down,

2708

interfaces_to_take_down_size,

2709

interface))){

2710

ret_errno = take_down_interface(interface);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

3048

2713

perror_plus("Failed to take down interface");

3049

2714

}

3050

2715

}

3055

2720

}

3056

2721

}

3057

2722

3058

ret = lower_privileges_permanently();

3059

if(ret != 0){

3060

errno = ret;

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

3061

2726

perror_plus("Failed to lower privileges permanently");

3062

2727

}

3063

2728

}

3065

2730

free(interfaces_to_take_down);

3066

2731

free(interfaces_hooks);

3067

2732

3068

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

3069

uintmax_t level){

3070

struct dirent **direntries = NULL;

3071

int dret;

3072

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

3073

O_RDONLY

3074

| O_NOFOLLOW

3075

| O_DIRECTORY

3076

| O_PATH));

3077

if(dir_fd == -1){

3078

perror_plus("open");

3079

return;

3080

}

3081

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

3082

notdotentries, alphasort);

3083

if(numentries >= 0){

3084

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

3085

if(debug){

3086

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

3087

dirname, direntries[i]->d_name);

3088

}

3089

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

3090

if(dret == -1){

3091

if(errno == EISDIR){

3092

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

3093

AT_REMOVEDIR);

3094

}

3095

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

3096

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

3097

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

3098

/* Recurse only in this special case */

3099

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

3100

dret = 0;

3101

}

3102

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

3103

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

3104

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

3105

}

3106

}

3107

free(direntries[i]);

3108

}

3109

3110

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

3111

free(direntries);

3112

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3113

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

3114

perror_plus("rmdir");

3115

}

3116

} else {

3117

perror_plus("scandirat");

3118

}

3119

close(dir_fd);

3120

}

3121

3122

2733

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

3123

2734

if(tempdir != NULL){

3124

clean_dir_at(-1, tempdir, 0);

2735

struct dirent **direntries = NULL;

2736

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

2737

O_NOFOLLOW));

2738

if(tempdir_fd == -1){

2739

perror_plus("open");

2740

} else {

2741

#ifdef __GLIBC__

2742

#if __GLIBC_PREREQ(2, 15)

2743

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

2744

notdotentries, alphasort);

2745

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

2746

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

2747

alphasort);

2748

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

2749

#else /* not __GLIBC__ */

2750

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

2751

alphasort);

2752

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2754

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

2755

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

2756

if(ret == -1){

2757

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

2758

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

2759

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

2760

}

2761

free(direntries[i]);

2762

}

2763

2764

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

2765

free(direntries);

2766

if(numentries == -1){

2767

perror_plus("scandir");

2768

}

2769

ret = rmdir(tempdir);

2770

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

2771

perror_plus("rmdir");

2772

}

2773

}

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2775

}

3125

2776

}

3126

2777

3127

2778

if(quit_now){