/mandos/release : revision 237.7.461

9

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

10

*

11

* Everything else is

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

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

21

23

* WITHOUT ANY WARRANTY; without even the implied warranty of

22

24

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

23

25

* General Public License for more details.

24

26

*

25

27

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

26

* along with this program. If not, see

27

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

28

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

28

29

*

29

30

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

30

31

*/

40

41

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

42

43

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

44

stdout, ferror() */

44

45

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

45

46

#include <stddef.h> /* NULL, size_t, ssize_t */

46

47

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

47

48

strtof(), abort() */

48

49

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

49

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

50

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

50

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

51

asprintf(), strncpy(), strsignal()

52

*/

51

53

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

52

54

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

53

55

sockaddr_in6, PF_INET6,

57

59

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

58

60

inet_pton(), connect(),

59

61

getnameinfo() */

60

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

62

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

61

63

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

62

64

*/

63

65

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

64

66

strtoimax() */

65

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

67

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

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

66

72

program_invocation_short_name */

67

73

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

68

74

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

73

79

*/

74

80

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

75

81

getuid(), getgid(), seteuid(),

76

setgid(), pause(), _exit() */

82

setgid(), pause(), _exit(),

83

unlinkat() */

77

84

#include <arpa/inet.h> /* inet_pton(), htons() */

78

85

#include <iso646.h> /* not, or, and */

79

86

#include <argp.h> /* struct argp_option, error_t, struct

233

240

.af = af };

234

241

if(new_server->ip == NULL){

235

242

perror_plus("strdup");

243

free(new_server);

236

244

return false;

237

245

}

238

246

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

239

247

if(ret == -1){

240

248

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

257

free(new_server);

241

258

return false;

242

259

}

243

260

/* Special case of first server */

294

311

return false;

295

312

}

296

313

297

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

314

ret = close(fd);

298

315

if(ret == -1){

299

316

perror_plus("close");

300

317

}

482

499

return plaintext_length;

483

500

}

484

501

502

__attribute__((warn_unused_result, const))

503

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

504

if(str == NULL)

505

return "(unknown)";

506

return str;

507

}

508

485

509

__attribute__((warn_unused_result))

486

510

static const char *safer_gnutls_strerror(int value){

487

511

const char *ret = gnutls_strerror(value);

488

if(ret == NULL)

489

ret = "(unknown)";

490

return ret;

512

return safe_string(ret);

491

513

}

492

514

493

515

/* GnuTLS log function callback */

497

519

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

498

520

}

499

521

500

__attribute__((nonnull, warn_unused_result))

522

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

501

523

static int init_gnutls_global(const char *pubkeyfilename,

502

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

503

526

mandos_context *mc){

504

527

int ret;

528

unsigned int uret;

505

529

506

530

if(debug){

507

531

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

508

532

}

509

533

510

ret = gnutls_global_init();

511

if(ret != GNUTLS_E_SUCCESS){

512

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

513

safer_gnutls_strerror(ret));

514

return -1;

515

}

516

517

534

if(debug){

518

535

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

519

536

* - GnuTLS manual

527

544

if(ret != GNUTLS_E_SUCCESS){

528

545

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

529

546

safer_gnutls_strerror(ret));

530

gnutls_global_deinit();

531

547

return -1;

532

548

}

533

549

558

574

safer_gnutls_strerror(ret));

559

575

goto globalfail;

560

576

}

561

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

562

if(ret != GNUTLS_E_SUCCESS){

563

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

564

safer_gnutls_strerror(ret));

565

goto globalfail;

566

}

567

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;

588

while(true){

589

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

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

593

perror_plus("incbuffer");

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

597

break;

598

}

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

601

BUFFER_SIZE);

602

/* EOF */

603

if(bytes_read == 0){

604

break;

605

}

606

/* check bytes_read for failure */

607

if(bytes_read < 0){

608

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

if(params.data == NULL){

617

dhparamsfilename = NULL;

618

}

619

if(dhparamsfilename == NULL){

620

break;

621

}

622

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

623

GNUTLS_X509_FMT_PEM);

624

if(ret != GNUTLS_E_SUCCESS){

625

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

626

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

627

safer_gnutls_strerror(ret));

628

dhparamsfilename = NULL;

629

}

630

free(params.data);

631

} while(false);

632

}

633

if(dhparamsfilename == NULL){

634

if(mc->dh_bits == 0){

635

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

636

/* Try to read the private key file */

637

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

638

do {

639

int secfile = open(seckeyfilename, O_RDONLY);

640

if(secfile == -1){

641

perror_plus("open");

642

break;

643

}

644

size_t buffer_capacity = 0;

645

while(true){

646

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

647

(size_t)buffer.size,

648

(size_t)buffer_capacity);

649

if(buffer_capacity == 0){

650

perror_plus("incbuffer");

651

free(buffer.data);

652

buffer.data = NULL;

653

break;

654

}

655

ssize_t bytes_read = read(secfile,

656

buffer.data + buffer.size,

657

BUFFER_SIZE);

658

/* EOF */

659

if(bytes_read == 0){

660

break;

661

}

662

/* check bytes_read for failure */

663

if(bytes_read < 0){

664

perror_plus("read");

665

free(buffer.data);

666

buffer.data = NULL;

667

break;

668

}

669

buffer.size += (unsigned int)bytes_read;

670

}

671

close(secfile);

672

} while(false);

673

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

674

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

675

if(buffer.data != NULL){

676

{

677

gnutls_openpgp_privkey_t privkey = NULL;

678

ret = gnutls_openpgp_privkey_init(&privkey);

679

if(ret != GNUTLS_E_SUCCESS){

680

fprintf_plus(stderr, "Error initializing OpenPGP key"

681

" structure: %s",

682

safer_gnutls_strerror(ret));

683

free(buffer.data);

684

buffer.data = NULL;

685

} else {

686

ret = gnutls_openpgp_privkey_import

687

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

688

if(ret != GNUTLS_E_SUCCESS){

689

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

690

safer_gnutls_strerror(ret));

691

privkey = NULL;

692

}

693

free(buffer.data);

694

buffer.data = NULL;

695

if(privkey != NULL){

696

/* Use private key to suggest an appropriate

697

sec_param */

698

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

699

gnutls_openpgp_privkey_deinit(privkey);

700

if(debug){

701

fprintf_plus(stderr, "This OpenPGP key implies using"

702

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

703

safe_string(gnutls_sec_param_get_name

704

(sec_param)));

705

}

706

}

707

}

708

}

709

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

710

/* Err on the side of caution */

711

sec_param = GNUTLS_SEC_PARAM_ULTRA;

712

if(debug){

713

fprintf_plus(stderr, "Falling back to security parameter"

714

" \"%s\"\n",

715

safe_string(gnutls_sec_param_get_name

716

(sec_param)));

717

}

718

}

719

}

720

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

721

if(uret != 0){

722

mc->dh_bits = uret;

723

if(debug){

724

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

725

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

726

safe_string(gnutls_sec_param_get_name

727

(sec_param)),

728

mc->dh_bits);

729

}

730

} else {

731

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

732

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

733

safe_string(gnutls_sec_param_get_name

734

(sec_param)),

735

safer_gnutls_strerror(ret));

736

goto globalfail;

737

}

738

} else if(debug){

739

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

740

mc->dh_bits);

741

}

742

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

743

if(ret != GNUTLS_E_SUCCESS){

744

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

745

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

746

safer_gnutls_strerror(ret));

747

goto globalfail;

748

}

749

}

568

750

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

569

751

570

752

return 0;

572

754

globalfail:

573

755

574

756

gnutls_certificate_free_credentials(mc->cred);

575

gnutls_global_deinit();

576

757

gnutls_dh_params_deinit(mc->dh_params);

577

758

return -1;

578

759

}

630

811

/* ignore client certificate if any. */

631

812

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

632

813

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

634

635

814

return 0;

636

815

}

637

816

639

818

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

640

819

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

641

820

821

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

822

__attribute__((warn_unused_result))

823

int raise_privileges(void){

824

int old_errno = errno;

825

int ret = 0;

826

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

827

ret = errno;

828

}

829

errno = old_errno;

830

return ret;

831

}

832

833

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

834

__attribute__((warn_unused_result))

835

int raise_privileges_permanently(void){

836

int old_errno = errno;

837

int ret = raise_privileges();

838

if(ret != 0){

839

errno = old_errno;

840

return ret;

841

}

842

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

843

ret = errno;

844

}

845

errno = old_errno;

846

return ret;

847

}

848

849

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

850

__attribute__((warn_unused_result))

851

int lower_privileges(void){

852

int old_errno = errno;

853

int ret = 0;

854

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

855

ret = errno;

856

}

857

errno = old_errno;

858

return ret;

859

}

860

861

/* Lower privileges permanently */

862

__attribute__((warn_unused_result))

863

int lower_privileges_permanently(void){

864

int old_errno = errno;

865

int ret = 0;

866

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

867

ret = errno;

868

}

869

errno = old_errno;

870

return ret;

871

}

872

873

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

874

__attribute__((nonnull, warn_unused_result))

875

static bool add_delete_local_route(const bool add,

876

const char *address,

877

AvahiIfIndex if_index){

878

int ret;

879

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

880

char add_arg[] = "add";

881

char delete_arg[] = "delete";

882

char debug_flag[] = "--debug";

883

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

884

if(pluginhelperdir == NULL){

885

if(debug){

886

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

887

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

888

}

889

return false;

890

}

891

892

char interface[IF_NAMESIZE];

893

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

894

perror_plus("if_indextoname");

895

return false;

896

}

897

898

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

899

if(devnull == -1){

900

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

901

return false;

902

}

903

pid_t pid = fork();

904

if(pid == 0){

905

/* Child */

906

/* Raise privileges */

907

errno = raise_privileges_permanently();

908

if(errno != 0){

909

perror_plus("Failed to raise privileges");

910

/* _exit(EX_NOPERM); */

911

} else {

912

/* Set group */

913

errno = 0;

914

ret = setgid(0);

915

if(ret == -1){

916

perror_plus("setgid");

917

_exit(EX_NOPERM);

918

}

919

/* Reset supplementary groups */

920

errno = 0;

921

ret = setgroups(0, NULL);

922

if(ret == -1){

923

perror_plus("setgroups");

924

_exit(EX_NOPERM);

925

}

926

}

927

ret = dup2(devnull, STDIN_FILENO);

928

if(ret == -1){

929

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

930

_exit(EX_OSERR);

931

}

932

ret = close(devnull);

933

if(ret == -1){

934

perror_plus("close");

935

_exit(EX_OSERR);

936

}

937

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

938

if(ret == -1){

939

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

940

_exit(EX_OSERR);

941

}

942

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

943

O_RDONLY

944

| O_DIRECTORY

945

| O_PATH

946

| O_CLOEXEC));

947

if(helperdir_fd == -1){

948

perror_plus("open");

949

_exit(EX_UNAVAILABLE);

950

}

951

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

952

helper, O_RDONLY));

953

if(helper_fd == -1){

954

perror_plus("openat");

955

close(helperdir_fd);

956

_exit(EX_UNAVAILABLE);

957

}

958

close(helperdir_fd);

959

#ifdef __GNUC__

960

#pragma GCC diagnostic push

961

#pragma GCC diagnostic ignored "-Wcast-qual"

962

#endif

963

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

964

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

965

interface, debug ? debug_flag : NULL, NULL },

966

environ) == -1){

967

#ifdef __GNUC__

968

#pragma GCC diagnostic pop

969

#endif

970

perror_plus("fexecve");

971

_exit(EXIT_FAILURE);

972

}

973

}

974

if(pid == -1){

975

perror_plus("fork");

976

return false;

977

}

978

int status;

979

pid_t pret = -1;

980

errno = 0;

981

do {

982

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

983

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

984

int errno_raising = 0;

985

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

986

errno_raising = errno;

987

perror_plus("Failed to raise privileges in order to"

988

" kill helper program");

989

}

990

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

991

perror_plus("kill");

992

}

993

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

994

perror_plus("Failed to lower privileges after killing"

995

" helper program");

996

}

997

return false;

998

}

999

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

1000

if(pret == -1){

1001

perror_plus("waitpid");

1002

return false;

1003

}

1004

if(WIFEXITED(status)){

1005

if(WEXITSTATUS(status) != 0){

1006

fprintf_plus(stderr, "Error: iprouteadddel exited"

1007

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

1008

return false;

1009

}

1010

return true;

1011

}

1012

if(WIFSIGNALED(status)){

1013

fprintf_plus(stderr, "Error: iprouteadddel died by"

1014

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

1015

return false;

1016

}

1017

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

1018

return false;

1019

}

1020

1021

__attribute__((nonnull, warn_unused_result))

1022

static bool add_local_route(const char *address,

1023

AvahiIfIndex if_index){

1024

if(debug){

1025

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

1026

}

1027

return add_delete_local_route(true, address, if_index);

1028

}

1029

1030

__attribute__((nonnull, warn_unused_result))

1031

static bool delete_local_route(const char *address,

1032

AvahiIfIndex if_index){

1033

if(debug){

1034

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

1035

}

1036

return add_delete_local_route(false, address, if_index);

1037

}

1038

642

1039

/* Called when a Mandos server is found */

643

1040

__attribute__((nonnull, warn_unused_result))

644

1041

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

655

1052

int retval = -1;

656

1053

gnutls_session_t session;

657

1054

int pf; /* Protocol family */

1055

bool route_added = false;

658

1056

659

1057

errno = 0;

660

1058

682

1080

bool match = false;

683

1081

{

684

1082

char *interface = NULL;

685

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

686

interface))){

1083

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

1084

mc->interfaces_size,

1085

interface))){

687

1086

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

688

1087

match = true;

689

1088

break;

718

1117

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

719

1118

}

720

1119

721

tcp_sd = socket(pf, SOCK_STREAM, 0);

1120

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

722

1121

if(tcp_sd < 0){

723

1122

int e = errno;

724

1123

perror_plus("socket");

731

1130

goto mandos_end;

732

1131

}

733

1132

734

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

735

1133

if(af == AF_INET6){

736

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

737

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

1134

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

1135

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

1136

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

738

1137

} else { /* IPv4 */

739

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

740

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

1138

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

1139

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

1140

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

741

1141

}

742

1142

if(ret < 0 ){

743

1143

int e = errno;

813

1213

goto mandos_end;

814

1214

}

815

1215

816

if(af == AF_INET6){

817

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

818

sizeof(struct sockaddr_in6));

819

} else {

820

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

821

sizeof(struct sockaddr_in));

822

}

823

if(ret < 0){

824

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

825

int e = errno;

826

perror_plus("connect");

827

errno = e;

828

}

829

goto mandos_end;

830

}

831

832

if(quit_now){

833

errno = EINTR;

834

goto mandos_end;

1216

while(true){

1217

if(af == AF_INET6){

1218

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

1219

sizeof(struct sockaddr_in6));

1220

} else {

1221

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

1222

sizeof(struct sockaddr_in));

1223

}

1224

if(ret < 0){

1225

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

1226

and if_index != AVAHI_IF_UNSPEC

1227

and connect_to == NULL

1228

and not route_added and

1229

((af == AF_INET6 and not

1230

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1231

&to)->sin6_addr)))

1232

or (af == AF_INET and

1233

/* Not a a IPv4LL address */

1234

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

1235

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

1236

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

1237

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

1238

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

1239

connect to a Mandos server announced by Avahi on a server

1240

host with a global address. Work around this by retrying

1241

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

1242

1243

Avahi bug reference:

1244

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

1245

https://bugs.debian.org/587961

1246

*/

1247

if(debug){

1248

fprintf_plus(stderr, "Mandos server unreachable, trying"

1249

" direct route\n");

1250

}

1251

int e = errno;

1252

route_added = add_local_route(ip, if_index);

1253

if(route_added){

1254

continue;

1255

}

1256

errno = e;

1257

}

1258

if(errno != ECONNREFUSED or debug){

1259

int e = errno;

1260

perror_plus("connect");

1261

errno = e;

1262

}

1263

goto mandos_end;

1264

}

1265

1266

if(quit_now){

1267

errno = EINTR;

1268

goto mandos_end;

1269

}

1270

break;

835

1271

}

836

1272

837

1273

const char *out = mandos_protocol_version;

991

1427

&decrypted_buffer, mc);

992

1428

if(decrypted_buffer_size >= 0){

993

1429

1430

clearerr(stdout);

994

1431

written = 0;

995

1432

while(written < (size_t) decrypted_buffer_size){

996

1433

if(quit_now){

1012

1449

}

1013

1450

written += (size_t)ret;

1014

1451

}

1452

ret = fflush(stdout);

1453

if(ret != 0){

1454

int e = errno;

1455

if(debug){

1456

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

1457

strerror(errno));

1458

}

1459

errno = e;

1460

goto mandos_end;

1461

}

1015

1462

retval = 0;

1016

1463

}

1017

1464

}

1020

1467

1021

1468

mandos_end:

1022

1469

{

1470

if(route_added){

1471

if(not delete_local_route(ip, if_index)){

1472

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

1473

" interface %d", ip, if_index);

1474

}

1475

}

1023

1476

int e = errno;

1024

1477

free(decrypted_buffer);

1025

1478

free(buffer);

1026

1479

if(tcp_sd >= 0){

1027

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

1480

ret = close(tcp_sd);

1028

1481

}

1029

1482

if(ret == -1){

1030

1483

if(e == 0){

1042

1495

return retval;

1043

1496

}

1044

1497

1045

__attribute__((nonnull))

1046

1498

static void resolve_callback(AvahiSServiceResolver *r,

1047

1499

AvahiIfIndex interface,

1048

1500

AvahiProtocol proto,

1065

1517

timed out */

1066

1518

1067

1519

if(quit_now){

1520

avahi_s_service_resolver_free(r);

1068

1521

return;

1069

1522

}

1070

1523

1184

1637

__attribute__((nonnull, warn_unused_result))

1185

1638

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

1186

1639

int ret;

1187

error_t ret_errno;

1640

int old_errno;

1188

1641

1189

1642

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

1190

1643

if(s < 0){

1191

ret_errno = errno;

1644

old_errno = errno;

1192

1645

perror_plus("socket");

1193

errno = ret_errno;

1646

errno = old_errno;

1194

1647

return false;

1195

1648

}

1196

strcpy(ifr->ifr_name, ifname);

1649

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

1650

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

1197

1651

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1198

1652

if(ret == -1){

1199

1653

if(debug){

1200

ret_errno = errno;

1654

old_errno = errno;

1201

1655

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1656

errno = old_errno;

1203

1657

}

1204

1658

return false;

1205

1659

}

1346

1800

return 0;

1347

1801

}

1348

1802

1349

char *fullname = NULL;

1350

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1351

if(ret < 0){

1352

perror_plus("asprintf");

1353

return 0;

1354

}

1355

1356

ret = stat(fullname, &st);

1803

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1357

1804

if(ret == -1){

1358

1805

if(debug){

1359

1806

perror_plus("Could not stat hook");

1360

1807

}

1361

1808

return 0;

1362

1809

}

1363

free(fullname);

1364

1810

if(not (S_ISREG(st.st_mode))){

1365

1811

/* Not a regular file */

1366

1812

if(debug){

1458

1904

}

1459

1905

}

1460

1906

1461

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

1462

__attribute__((warn_unused_result))

1463

error_t raise_privileges(void){

1464

error_t old_errno = errno;

1465

error_t ret_errno = 0;

1466

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

1467

ret_errno = errno;

1468

perror_plus("seteuid");

1469

}

1470

errno = old_errno;

1471

return ret_errno;

1472

}

1473

1474

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

1475

__attribute__((warn_unused_result))

1476

error_t raise_privileges_permanently(void){

1477

error_t old_errno = errno;

1478

error_t ret_errno = raise_privileges();

1479

if(ret_errno != 0){

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

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

1484

ret_errno = errno;

1485

perror_plus("seteuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

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

1492

__attribute__((warn_unused_result))

1493

error_t lower_privileges(void){

1494

error_t old_errno = errno;

1495

error_t ret_errno = 0;

1496

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

1497

ret_errno = errno;

1498

perror_plus("seteuid");

1499

}

1500

errno = old_errno;

1501

return ret_errno;

1502

}

1503

1504

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1506

error_t lower_privileges_permanently(void){

1507

error_t old_errno = errno;

1508

error_t ret_errno = 0;

1509

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

1510

ret_errno = errno;

1511

perror_plus("setuid");

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

#ifndef O_CLOEXEC

1518

/*

1519

* Based on the example in the GNU LibC manual chapter 13.13 "File

1520

* Descriptor Flags".

1521

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1522

*/

1523

__attribute__((warn_unused_result))

1524

static int set_cloexec_flag(int fd){

1525

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1526

/* If reading the flags failed, return error indication now. */

1527

if(ret < 0){

1528

return ret;

1529

}

1530

/* Store modified flag word in the descriptor. */

1531

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1532

ret | FD_CLOEXEC));

1533

}

1534

#endif /* not O_CLOEXEC */

1535

1536

1907

__attribute__((nonnull))

1537

1908

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

1538

1909

const float delay){

1539

struct dirent **direntries;

1910

struct dirent **direntries = NULL;

1540

1911

if(hookdir_fd == -1){

1541

hookdir_fd = open(hookdir, O_RDONLY |

1542

#ifdef O_CLOEXEC

1543

O_CLOEXEC

1544

#else /* not O_CLOEXEC */

1545

0

1546

#endif /* not O_CLOEXEC */

1547

);

1912

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1913

| O_CLOEXEC);

1548

1914

if(hookdir_fd == -1){

1549

1915

if(errno == ENOENT){

1550

1916

if(debug){

1556

1922

}

1557

1923

return;

1558

1924

}

1559

#ifndef O_CLOEXEC

1560

if(set_cloexec_flag(hookdir_fd) < 0){

1561

perror_plus("set_cloexec_flag");

1562

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

1563

perror_plus("close");

1564

} else {

1565

hookdir_fd = -1;

1566

}

1567

return;

1568

}

1569

#endif /* not O_CLOEXEC */

1570

1925

}

1571

#ifdef __GLIBC__

1572

#if __GLIBC_PREREQ(2, 15)

1573

1926

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

1574

1927

runnable_hook, alphasort);

1575

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

1576

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

1577

alphasort);

1578

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

1579

#else /* not __GLIBC__ */

1580

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

1581

alphasort);

1582

#endif /* not __GLIBC__ */

1583

1928

if(numhooks == -1){

1584

1929

perror_plus("scandir");

1585

1930

return;

1586

1931

}

1587

1932

struct dirent *direntry;

1588

1933

int ret;

1589

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

1934

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

1935

if(devnull == -1){

1936

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

1937

return;

1938

}

1590

1939

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

1591

1940

direntry = direntries[i];

1592

1941

if(debug){

1597

1946

if(hook_pid == 0){

1598

1947

/* Child */

1599

1948

/* Raise privileges */

1600

if(raise_privileges_permanently() != 0){

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1601

1951

perror_plus("Failed to raise privileges");

1602

1952

_exit(EX_NOPERM);

1603

1953

}

1615

1965

perror_plus("setgroups");

1616

1966

_exit(EX_NOPERM);

1617

1967

}

1618

ret = dup2(devnull, STDIN_FILENO);

1619

if(ret == -1){

1620

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

1621

_exit(EX_OSERR);

1622

}

1623

ret = close(devnull);

1624

if(ret == -1){

1625

perror_plus("close");

1626

_exit(EX_OSERR);

1627

}

1628

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1629

if(ret == -1){

1630

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

1631

_exit(EX_OSERR);

1632

}

1633

1968

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

1634

1969

if(ret == -1){

1635

1970

perror_plus("setenv");

1670

2005

_exit(EX_OSERR);

1671

2006

}

1672

2007

}

1673

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

1674

{ direntry->d_name, NULL }, environ) == -1){

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

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

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

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

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

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

2032

_exit(EX_OSERR);

2033

}

2034

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

2035

environ) == -1){

1675

2036

perror_plus("fexecve");

1676

2037

_exit(EXIT_FAILURE);

1677

2038

}

1678

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

1679

2045

int status;

1680

2046

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

1681

2047

perror_plus("waitpid");

2048

free(direntry);

1682

2049

continue;

1683

2050

}

1684

2051

if(WIFEXITED(status)){

1686

2053

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

1687

2054

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

1688

2055

WEXITSTATUS(status));

2056

free(direntry);

1689

2057

continue;

1690

2058

}

1691

2059

} else if(WIFSIGNALED(status)){

1692

2060

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

1693

2061

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

1694

2062

WTERMSIG(status));

2063

free(direntry);

1695

2064

continue;

1696

2065

} else {

1697

2066

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

1698

2067

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

2068

free(direntry);

1699

2069

continue;

1700

2070

}

1701

2071

}

1703

2073

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

1704

2074

direntry->d_name);

1705

2075

}

2076

free(direntry);

1706

2077

}

1707

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

2078

free(direntries);

2079

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

1708

2080

perror_plus("close");

1709

2081

} else {

1710

2082

hookdir_fd = -1;

1713

2085

}

1714

2086

1715

2087

__attribute__((nonnull, warn_unused_result))

1716

error_t bring_up_interface(const char *const interface,

1717

const float delay){

1718

error_t old_errno = errno;

2088

int bring_up_interface(const char *const interface,

2089

const float delay){

2090

int old_errno = errno;

1719

2091

int ret;

1720

2092

struct ifreq network;

1721

2093

unsigned int if_index = if_nametoindex(interface);

1731

2103

}

1732

2104

1733

2105

if(not interface_is_up(interface)){

1734

error_t ret_errno = 0, ioctl_errno = 0;

2106

int ret_errno = 0;

2107

int ioctl_errno = 0;

1735

2108

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

1736

2109

ret_errno = errno;

1737

2110

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

1750

2123

}

1751

2124

1752

2125

if(quit_now){

1753

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

2126

ret = close(sd);

1754

2127

if(ret == -1){

1755

2128

perror_plus("close");

1756

2129

}

1766

2139

/* Raise privileges */

1767

2140

ret_errno = raise_privileges();

1768

2141

if(ret_errno != 0){

2142

errno = ret_errno;

1769

2143

perror_plus("Failed to raise privileges");

1770

2144

}

1771

2145

1805

2179

}

1806

2180

1807

2181

/* Close the socket */

1808

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

2182

ret = close(sd);

1809

2183

if(ret == -1){

1810

2184

perror_plus("close");

1811

2185

}

1823

2197

1824

2198

/* Sleep checking until interface is running.

1825

2199

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

1826

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

2200

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

1827

2201

if(interface_is_running(interface)){

1828

2202

break;

1829

2203

}

1839

2213

}

1840

2214

1841

2215

__attribute__((nonnull, warn_unused_result))

1842

error_t take_down_interface(const char *const interface){

1843

error_t old_errno = errno;

2216

int take_down_interface(const char *const interface){

2217

int old_errno = errno;

1844

2218

struct ifreq network;

1845

2219

unsigned int if_index = if_nametoindex(interface);

1846

2220

if(if_index == 0){

1849

2223

return ENXIO;

1850

2224

}

1851

2225

if(interface_is_up(interface)){

1852

error_t ret_errno = 0, ioctl_errno = 0;

2226

int ret_errno = 0;

2227

int ioctl_errno = 0;

1853

2228

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

1854

2229

ret_errno = errno;

1855

2230

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

1875

2250

/* Raise privileges */

1876

2251

ret_errno = raise_privileges();

1877

2252

if(ret_errno != 0){

2253

errno = ret_errno;

1878

2254

perror_plus("Failed to raise privileges");

1879

2255

}

1880

2256

1892

2268

}

1893

2269

1894

2270

/* Close the socket */

1895

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

2271

int ret = close(sd);

1896

2272

if(ret == -1){

1897

2273

perror_plus("close");

1898

2274

}

1913

2289

}

1914

2290

1915

2291

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

1916

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

1917

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

1918

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

1919

.interfaces = NULL, .interfaces_size = 0 };

2292

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

2293

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

2294

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

2295

.current_server = NULL, .interfaces = NULL,

2296

.interfaces_size = 0 };

1920

2297

AvahiSServiceBrowser *sb = NULL;

1921

2298

error_t ret_errno;

1922

2299

int ret;

1931

2308

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1932

2309

const char *seckey = PATHDIR "/" SECKEY;

1933

2310

const char *pubkey = PATHDIR "/" PUBKEY;

2311

const char *dh_params_file = NULL;

1934

2312

char *interfaces_hooks = NULL;

1935

2313

1936

2314

bool gnutls_initialized = false;

1989

2367

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

1990

2368

" Diffie-Hellman key exchange",

1991

2369

.group = 2 },

2370

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

2371

.arg = "FILE",

2372

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

2373

" for the Diffie-Hellman key exchange",

2374

.group = 2 },

1992

2375

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

1993

2376

.arg = "STRING",

1994

2377

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

2049

2432

}

2050

2433

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

2051

2434

break;

2435

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

2436

dh_params_file = arg;

2437

break;

2052

2438

case 130: /* --priority */

2053

2439

mc.priority = arg;

2054

2440

break;

2094

2480

.args_doc = "",

2095

2481

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

2096

2482

" passwords from a Mandos server" };

2097

ret = argp_parse(&argp, argc, argv,

2098

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2099

switch(ret){

2483

ret_errno = argp_parse(&argp, argc, argv,

2484

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2485

switch(ret_errno){

2100

2486

case 0:

2101

2487

break;

2102

2488

case ENOMEM:

2103

2489

default:

2104

errno = ret;

2490

errno = ret_errno;

2105

2491

perror_plus("argp_parse");

2106

2492

exitcode = EX_OSERR;

2107

2493

goto end;

2110

2496

goto end;

2111

2497

}

2112

2498

}

2113

2499

2114

2500

{

2115

2501

/* Work around Debian bug #633582:

2116

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

2502

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

2117

2503

2118

2504

/* Re-raise privileges */

2119

ret_errno = raise_privileges();

2120

if(ret_errno != 0){

2121

errno = ret_errno;

2505

ret = raise_privileges();

2506

if(ret != 0){

2507

errno = ret;

2122

2508

perror_plus("Failed to raise privileges");

2123

2509

} else {

2124

2510

struct stat st;

2140

2526

}

2141

2527

}

2142

2528

}

2143

TEMP_FAILURE_RETRY(close(seckey_fd));

2529

close(seckey_fd);

2144

2530

}

2145

2531

}

2146

2532

2147

2533

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

2148

2534

int pubkey_fd = open(pubkey, O_RDONLY);

2149

2535

if(pubkey_fd == -1){

2161

2547

}

2162

2548

}

2163

2549

}

2164

TEMP_FAILURE_RETRY(close(pubkey_fd));

2165

}

2166

}

2167

2550

close(pubkey_fd);

2551

}

2552

}

2553

2554

if(dh_params_file != NULL

2555

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

2556

int dhparams_fd = open(dh_params_file, O_RDONLY);

2557

if(dhparams_fd == -1){

2558

perror_plus("open");

2559

} else {

2560

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

2561

if(ret == -1){

2562

perror_plus("fstat");

2563

} else {

2564

if(S_ISREG(st.st_mode)

2565

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

2566

ret = fchown(dhparams_fd, uid, gid);

2567

if(ret == -1){

2568

perror_plus("fchown");

2569

}

2570

}

2571

}

2572

close(dhparams_fd);

2573

}

2574

}

2575

2168

2576

/* Lower privileges */

2169

ret_errno = lower_privileges();

2170

if(ret_errno != 0){

2171

errno = ret_errno;

2577

ret = lower_privileges();

2578

if(ret != 0){

2579

errno = ret;

2172

2580

perror_plus("Failed to lower privileges");

2173

2581

}

2174

2582

}

2287

2695

2288

2696

/* If no interfaces were specified, make a list */

2289

2697

if(mc.interfaces == NULL){

2290

struct dirent **direntries;

2698

struct dirent **direntries = NULL;

2291

2699

/* Look for any good interfaces */

2292

2700

ret = scandir(sys_class_net, &direntries, good_interface,

2293

2701

alphasort);

2299

2707

if(ret_errno != 0){

2300

2708

errno = ret_errno;

2301

2709

perror_plus("argz_add");

2710

free(direntries[i]);

2302

2711

continue;

2303

2712

}

2304

2713

if(debug){

2305

2714

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

2306

2715

direntries[i]->d_name);

2307

2716

}

2717

free(direntries[i]);

2308

2718

}

2309

2719

free(direntries);

2310

2720

} else {

2311

free(direntries);

2721

if(ret == 0){

2722

free(direntries);

2723

}

2312

2724

fprintf_plus(stderr, "Could not find a network interface\n");

2313

2725

exitcode = EXIT_FAILURE;

2314

2726

goto end;

2340

2752

errno = bring_up_interface(interface, delay);

2341

2753

if(not interface_was_up){

2342

2754

if(errno != 0){

2343

perror_plus("Failed to bring up interface");

2755

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

2756

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

2344

2757

} else {

2345

2758

errno = argz_add(&interfaces_to_take_down,

2346

2759

&interfaces_to_take_down_size,

2369

2782

goto end;

2370

2783

}

2371

2784

2372

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

2785

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

2373

2786

if(ret == -1){

2374

2787

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

2375

2788

exitcode = EX_UNAVAILABLE;

2497

2910

2498

2911

/* Allocate a new server */

2499

2912

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2500

&config, NULL, NULL, &ret_errno);

2913

&config, NULL, NULL, &ret);

2501

2914

2502

2915

/* Free the Avahi configuration data */

2503

2916

avahi_server_config_free(&config);

2506

2919

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

2507

2920

if(mc.server == NULL){

2508

2921

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

2509

avahi_strerror(ret_errno));

2922

avahi_strerror(ret));

2510

2923

exitcode = EX_UNAVAILABLE;

2511

2924

goto end;

2512

2925

}

2547

2960

end:

2548

2961

2549

2962

if(debug){

2550

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

2963

if(signal_received){

2964

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

2965

argv[0], signal_received,

2966

strsignal(signal_received));

2967

} else {

2968

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

2969

}

2551

2970

}

2552

2971

2553

2972

/* Cleanup things */

2564

2983

2565

2984

if(gnutls_initialized){

2566

2985

gnutls_certificate_free_credentials(mc.cred);

2567

gnutls_global_deinit();

2568

2986

gnutls_dh_params_deinit(mc.dh_params);

2569

2987

}

2570

2988

2578

2996

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

2579

2997

while(mc.current_server != NULL){

2580

2998

server *next = mc.current_server->next;

2999

#ifdef __GNUC__

3000

#pragma GCC diagnostic push

3001

#pragma GCC diagnostic ignored "-Wcast-qual"

3002

#endif

3003

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

3004

#ifdef __GNUC__

3005

#pragma GCC diagnostic pop

3006

#endif

2581

3007

free(mc.current_server);

2582

3008

mc.current_server = next;

2583

3009

}

2585

3011

2586

3012

/* Re-raise privileges */

2587

3013

{

2588

ret_errno = raise_privileges();

2589

if(ret_errno != 0){

3014

ret = raise_privileges();

3015

if(ret != 0){

3016

errno = ret;

2590

3017

perror_plus("Failed to raise privileges");

2591

3018

} else {

2592

3019

2597

3024

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

2598

3025

{

2599

3026

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

3027

while((interface = argz_next(interfaces_to_take_down,

3028

interfaces_to_take_down_size,

3029

interface))){

3030

ret = take_down_interface(interface);

3031

if(ret != 0){

3032

errno = ret;

2606

3033

perror_plus("Failed to take down interface");

2607

3034

}

2608

3035

}

2613

3040

}

2614

3041

}

2615

3042

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

3043

ret = lower_privileges_permanently();

3044

if(ret != 0){

3045

errno = ret;

2618

3046

perror_plus("Failed to lower privileges permanently");

2619

3047

}

2620

3048

}

2622

3050

free(interfaces_to_take_down);

2623

3051

free(interfaces_hooks);

2624

3052

3053

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

3054

uintmax_t level){

3055

struct dirent **direntries = NULL;

3056

int dret;

3057

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

3058

O_RDONLY

3059

| O_NOFOLLOW

3060

| O_DIRECTORY

3061

| O_PATH));

3062

if(dir_fd == -1){

3063

perror_plus("open");

3064

}

3065

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

3066

notdotentries, alphasort);

3067

if(numentries >= 0){

3068

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

3069

if(debug){

3070

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

3071

dirname, direntries[i]->d_name);

3072

}

3073

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

3074

if(dret == -1){

3075

if(errno == EISDIR){

3076

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

3077

AT_REMOVEDIR);

3078

}

3079

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

3080

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

3081

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

3082

/* Recurse only in this special case */

3083

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

3084

dret = 0;

3085

}

3086

if(dret == -1){

3087

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

3088

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

3089

}

3090

}

3091

free(direntries[i]);

3092

}

3093

3094

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

3095

free(direntries);

3096

if(numentries == -1){

3097

perror_plus("scandirat");

3098

}

3099

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3100

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

3101

perror_plus("rmdir");

3102

}

3103

} else {

3104

perror_plus("scandirat");

3105

}

3106

close(dir_fd);

3107

}

3108

2625

3109

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

2626

3110

if(tempdir != NULL){

2627

struct dirent **direntries = NULL;

2628

struct dirent *direntry = NULL;

2629

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

2630

alphasort);

2631

if(numentries > 0){

2632

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

2633

direntry = direntries[i];

2634

char *fullname = NULL;

2635

ret = asprintf(&fullname, "%s/%s", tempdir,

2636

direntry->d_name);

2637

if(ret < 0){

2638

perror_plus("asprintf");

2639

continue;

2640

}

2641

ret = remove(fullname);

2642

if(ret == -1){

2643

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2644

strerror(errno));

2645

}

2646

free(fullname);

2647

}

2648

}

2649

2650

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

2651

free(direntries);

2652

if(numentries == -1){

2653

perror_plus("scandir");

2654

}

2655

ret = rmdir(tempdir);

2656

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

2657

perror_plus("rmdir");

2658

}

3111

clean_dir_at(-1, tempdir, 0);

2659

3112

}

2660

3113

2661

3114

if(quit_now){