/mandos/release : revision 237.7.492

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

*/

46

47

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

47

48

strtof(), abort() */

48

49

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

49

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

50

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

50

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

51

asprintf(), strncpy(), strsignal()

52

*/

51

53

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

52

54

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

53

55

sockaddr_in6, PF_INET6,

57

59

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

58

60

inet_pton(), connect(),

59

61

getnameinfo() */

60

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

62

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

61

63

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

62

64

*/

63

65

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

64

66

strtoimax() */

65

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

67

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

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

66

72

program_invocation_short_name */

67

73

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

68

74

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

234

240

.af = af };

235

241

if(new_server->ip == NULL){

236

242

perror_plus("strdup");

243

free(new_server);

237

244

return false;

238

245

}

239

246

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

240

247

if(ret == -1){

241

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);

242

258

return false;

243

259

}

244

260

/* Special case of first server */

295

311

return false;

296

312

}

297

313

298

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

314

ret = close(fd);

299

315

if(ret == -1){

300

316

perror_plus("close");

301

317

}

404

420

if(result == NULL){

405

421

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

406

422

} else {

407

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

408

result->unsupported_algorithm);

423

if(result->unsupported_algorithm != NULL) {

424

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

425

result->unsupported_algorithm);

426

}

409

427

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

410

428

result->wrong_key_usage);

411

429

if(result->file_name != NULL){

483

501

return plaintext_length;

484

502

}

485

503

504

__attribute__((warn_unused_result, const))

505

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

506

if(str == NULL)

507

return "(unknown)";

508

return str;

509

}

510

486

511

__attribute__((warn_unused_result))

487

512

static const char *safer_gnutls_strerror(int value){

488

513

const char *ret = gnutls_strerror(value);

489

if(ret == NULL)

490

ret = "(unknown)";

491

return ret;

514

return safe_string(ret);

492

515

}

493

516

494

517

/* GnuTLS log function callback */

498

521

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

499

522

}

500

523

501

__attribute__((nonnull, warn_unused_result))

524

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

502

525

static int init_gnutls_global(const char *pubkeyfilename,

503

526

const char *seckeyfilename,

527

const char *dhparamsfilename,

504

528

mandos_context *mc){

505

529

int ret;

530

unsigned int uret;

506

531

507

532

if(debug){

508

533

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

509

534

}

510

535

511

ret = gnutls_global_init();

512

if(ret != GNUTLS_E_SUCCESS){

513

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

514

safer_gnutls_strerror(ret));

515

return -1;

516

}

517

518

536

if(debug){

519

537

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

520

538

* - GnuTLS manual

528

546

if(ret != GNUTLS_E_SUCCESS){

529

547

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

530

548

safer_gnutls_strerror(ret));

531

gnutls_global_deinit();

532

549

return -1;

533

550

}

534

551

559

576

safer_gnutls_strerror(ret));

560

577

goto globalfail;

561

578

}

562

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

563

if(ret != GNUTLS_E_SUCCESS){

564

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

565

safer_gnutls_strerror(ret));

566

goto globalfail;

567

}

568

579

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

580

if(dhparamsfilename != NULL){

581

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

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

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

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

ret = close(dhpfile);

619

if(ret == -1){

620

perror_plus("close");

621

}

622

if(params.data == NULL){

623

dhparamsfilename = NULL;

624

}

625

if(dhparamsfilename == NULL){

626

break;

627

}

628

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

629

GNUTLS_X509_FMT_PEM);

630

if(ret != GNUTLS_E_SUCCESS){

631

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

632

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

633

safer_gnutls_strerror(ret));

634

dhparamsfilename = NULL;

635

}

636

free(params.data);

637

} while(false);

638

}

639

if(dhparamsfilename == NULL){

640

if(mc->dh_bits == 0){

641

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

642

/* Try to read the private key file */

643

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

644

do {

645

int secfile = open(seckeyfilename, O_RDONLY);

646

if(secfile == -1){

647

perror_plus("open");

648

break;

649

}

650

size_t buffer_capacity = 0;

651

while(true){

652

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

653

(size_t)buffer.size,

654

(size_t)buffer_capacity);

655

if(buffer_capacity == 0){

656

perror_plus("incbuffer");

657

free(buffer.data);

658

buffer.data = NULL;

659

break;

660

}

661

ssize_t bytes_read = read(secfile,

662

buffer.data + buffer.size,

663

BUFFER_SIZE);

664

/* EOF */

665

if(bytes_read == 0){

666

break;

667

}

668

/* check bytes_read for failure */

669

if(bytes_read < 0){

670

perror_plus("read");

671

free(buffer.data);

672

buffer.data = NULL;

673

break;

674

}

675

buffer.size += (unsigned int)bytes_read;

676

}

677

close(secfile);

678

} while(false);

679

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

680

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

681

if(buffer.data != NULL){

682

{

683

gnutls_openpgp_privkey_t privkey = NULL;

684

ret = gnutls_openpgp_privkey_init(&privkey);

685

if(ret != GNUTLS_E_SUCCESS){

686

fprintf_plus(stderr, "Error initializing OpenPGP key"

687

" structure: %s",

688

safer_gnutls_strerror(ret));

689

free(buffer.data);

690

buffer.data = NULL;

691

} else {

692

ret = gnutls_openpgp_privkey_import

693

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

694

if(ret != GNUTLS_E_SUCCESS){

695

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

696

safer_gnutls_strerror(ret));

697

privkey = NULL;

698

}

699

free(buffer.data);

700

buffer.data = NULL;

701

if(privkey != NULL){

702

/* Use private key to suggest an appropriate

703

sec_param */

704

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

705

gnutls_openpgp_privkey_deinit(privkey);

706

if(debug){

707

fprintf_plus(stderr, "This OpenPGP key implies using"

708

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

709

safe_string(gnutls_sec_param_get_name

710

(sec_param)));

711

}

712

}

713

}

714

}

715

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

716

/* Err on the side of caution */

717

sec_param = GNUTLS_SEC_PARAM_ULTRA;

718

if(debug){

719

fprintf_plus(stderr, "Falling back to security parameter"

720

" \"%s\"\n",

721

safe_string(gnutls_sec_param_get_name

722

(sec_param)));

723

}

724

}

725

}

726

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

727

if(uret != 0){

728

mc->dh_bits = uret;

729

if(debug){

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

mc->dh_bits);

735

}

736

} else {

737

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

738

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

739

safe_string(gnutls_sec_param_get_name

740

(sec_param)),

741

safer_gnutls_strerror(ret));

742

goto globalfail;

743

}

744

} else if(debug){

745

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

746

mc->dh_bits);

747

}

748

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

749

if(ret != GNUTLS_E_SUCCESS){

750

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

751

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

752

safer_gnutls_strerror(ret));

753

goto globalfail;

754

}

755

}

569

756

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

570

757

571

758

return 0;

573

760

globalfail:

574

761

575

762

gnutls_certificate_free_credentials(mc->cred);

576

gnutls_global_deinit();

577

763

gnutls_dh_params_deinit(mc->dh_params);

578

764

return -1;

579

765

}

631

817

/* ignore client certificate if any. */

632

818

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

819

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

635

636

820

return 0;

637

821

}

638

822

640

824

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

641

825

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

642

826

827

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

828

__attribute__((warn_unused_result))

829

int raise_privileges(void){

830

int old_errno = errno;

831

int ret = 0;

832

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

833

ret = errno;

834

}

835

errno = old_errno;

836

return ret;

837

}

838

839

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

840

__attribute__((warn_unused_result))

841

int raise_privileges_permanently(void){

842

int old_errno = errno;

843

int ret = raise_privileges();

844

if(ret != 0){

845

errno = old_errno;

846

return ret;

847

}

848

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

849

ret = errno;

850

}

851

errno = old_errno;

852

return ret;

853

}

854

855

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

856

__attribute__((warn_unused_result))

857

int lower_privileges(void){

858

int old_errno = errno;

859

int ret = 0;

860

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

861

ret = errno;

862

}

863

errno = old_errno;

864

return ret;

865

}

866

867

/* Lower privileges permanently */

868

__attribute__((warn_unused_result))

869

int lower_privileges_permanently(void){

870

int old_errno = errno;

871

int ret = 0;

872

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

873

ret = errno;

874

}

875

errno = old_errno;

876

return ret;

877

}

878

879

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

880

__attribute__((nonnull, warn_unused_result))

881

static bool add_delete_local_route(const bool add,

882

const char *address,

883

AvahiIfIndex if_index){

884

int ret;

885

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

886

char add_arg[] = "add";

887

char delete_arg[] = "delete";

888

char debug_flag[] = "--debug";

889

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

890

if(pluginhelperdir == NULL){

891

if(debug){

892

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

893

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

894

}

895

return false;

896

}

897

898

char interface[IF_NAMESIZE];

899

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

900

perror_plus("if_indextoname");

901

return false;

902

}

903

904

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

905

if(devnull == -1){

906

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

907

return false;

908

}

909

pid_t pid = fork();

910

if(pid == 0){

911

/* Child */

912

/* Raise privileges */

913

errno = raise_privileges_permanently();

914

if(errno != 0){

915

perror_plus("Failed to raise privileges");

916

/* _exit(EX_NOPERM); */

917

} else {

918

/* Set group */

919

errno = 0;

920

ret = setgid(0);

921

if(ret == -1){

922

perror_plus("setgid");

923

_exit(EX_NOPERM);

924

}

925

/* Reset supplementary groups */

926

errno = 0;

927

ret = setgroups(0, NULL);

928

if(ret == -1){

929

perror_plus("setgroups");

930

_exit(EX_NOPERM);

931

}

932

}

933

ret = dup2(devnull, STDIN_FILENO);

934

if(ret == -1){

935

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

936

_exit(EX_OSERR);

937

}

938

ret = close(devnull);

939

if(ret == -1){

940

perror_plus("close");

941

_exit(EX_OSERR);

942

}

943

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

944

if(ret == -1){

945

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

946

_exit(EX_OSERR);

947

}

948

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

949

O_RDONLY

950

| O_DIRECTORY

951

| O_PATH

952

| O_CLOEXEC));

953

if(helperdir_fd == -1){

954

perror_plus("open");

955

_exit(EX_UNAVAILABLE);

956

}

957

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

958

helper, O_RDONLY));

959

if(helper_fd == -1){

960

perror_plus("openat");

961

close(helperdir_fd);

962

_exit(EX_UNAVAILABLE);

963

}

964

close(helperdir_fd);

965

#ifdef __GNUC__

966

#pragma GCC diagnostic push

967

#pragma GCC diagnostic ignored "-Wcast-qual"

968

#endif

969

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

970

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

971

interface, debug ? debug_flag : NULL, NULL },

972

environ) == -1){

973

#ifdef __GNUC__

974

#pragma GCC diagnostic pop

975

#endif

976

perror_plus("fexecve");

977

_exit(EXIT_FAILURE);

978

}

979

}

980

if(pid == -1){

981

perror_plus("fork");

982

return false;

983

}

984

int status;

985

pid_t pret = -1;

986

errno = 0;

987

do {

988

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

989

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

990

int errno_raising = 0;

991

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

992

errno_raising = errno;

993

perror_plus("Failed to raise privileges in order to"

994

" kill helper program");

995

}

996

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

997

perror_plus("kill");

998

}

999

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

1000

perror_plus("Failed to lower privileges after killing"

1001

" helper program");

1002

}

1003

return false;

1004

}

1005

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

1006

if(pret == -1){

1007

perror_plus("waitpid");

1008

return false;

1009

}

1010

if(WIFEXITED(status)){

1011

if(WEXITSTATUS(status) != 0){

1012

fprintf_plus(stderr, "Error: iprouteadddel exited"

1013

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

1014

return false;

1015

}

1016

return true;

1017

}

1018

if(WIFSIGNALED(status)){

1019

fprintf_plus(stderr, "Error: iprouteadddel died by"

1020

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

1021

return false;

1022

}

1023

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

1024

return false;

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool add_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(true, address, if_index);

1034

}

1035

1036

__attribute__((nonnull, warn_unused_result))

1037

static bool delete_local_route(const char *address,

1038

AvahiIfIndex if_index){

1039

if(debug){

1040

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

1041

}

1042

return add_delete_local_route(false, address, if_index);

1043

}

1044

643

1045

/* Called when a Mandos server is found */

644

1046

__attribute__((nonnull, warn_unused_result))

645

1047

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

656

1058

int retval = -1;

657

1059

gnutls_session_t session;

658

1060

int pf; /* Protocol family */

1061

bool route_added = false;

659

1062

660

1063

errno = 0;

661

1064

683

1086

bool match = false;

684

1087

{

685

1088

char *interface = NULL;

686

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

687

interface))){

1089

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

1090

mc->interfaces_size,

1091

interface))){

688

1092

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

689

1093

match = true;

690

1094

break;

719

1123

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

720

1124

}

721

1125

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

1126

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

723

1127

if(tcp_sd < 0){

724

1128

int e = errno;

725

1129

perror_plus("socket");

732

1136

goto mandos_end;

733

1137

}

734

1138

735

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

736

1139

if(af == AF_INET6){

737

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

738

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

1140

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

1141

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

1142

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

739

1143

} else { /* IPv4 */

740

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

741

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

1144

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

1145

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

1146

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

742

1147

}

743

1148

if(ret < 0 ){

744

1149

int e = errno;

814

1219

goto mandos_end;

815

1220

}

816

1221

817

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

820

} else {

821

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

822

sizeof(struct sockaddr_in));

823

}

824

if(ret < 0){

825

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

826

int e = errno;

827

perror_plus("connect");

828

errno = e;

829

}

830

goto mandos_end;

831

}

832

833

if(quit_now){

834

errno = EINTR;

835

goto mandos_end;

1222

while(true){

1223

if(af == AF_INET6){

1224

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

1225

sizeof(struct sockaddr_in6));

1226

} else {

1227

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

1228

sizeof(struct sockaddr_in));

1229

}

1230

if(ret < 0){

1231

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

1232

and if_index != AVAHI_IF_UNSPEC

1233

and connect_to == NULL

1234

and not route_added and

1235

((af == AF_INET6 and not

1236

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1237

&to)->sin6_addr)))

1238

or (af == AF_INET and

1239

/* Not a a IPv4LL address */

1240

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

1241

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

1242

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

1243

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

1244

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

1245

connect to a Mandos server announced by Avahi on a server

1246

host with a global address. Work around this by retrying

1247

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

1248

1249

Avahi bug reference:

1250

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

1251

https://bugs.debian.org/587961

1252

*/

1253

if(debug){

1254

fprintf_plus(stderr, "Mandos server unreachable, trying"

1255

" direct route\n");

1256

}

1257

int e = errno;

1258

route_added = add_local_route(ip, if_index);

1259

if(route_added){

1260

continue;

1261

}

1262

errno = e;

1263

}

1264

if(errno != ECONNREFUSED or debug){

1265

int e = errno;

1266

perror_plus("connect");

1267

errno = e;

1268

}

1269

goto mandos_end;

1270

}

1271

1272

if(quit_now){

1273

errno = EINTR;

1274

goto mandos_end;

1275

}

1276

break;

836

1277

}

837

1278

838

1279

const char *out = mandos_protocol_version;

992

1433

&decrypted_buffer, mc);

993

1434

if(decrypted_buffer_size >= 0){

994

1435

1436

clearerr(stdout);

995

1437

written = 0;

996

1438

while(written < (size_t) decrypted_buffer_size){

997

1439

if(quit_now){

1013

1455

}

1014

1456

written += (size_t)ret;

1015

1457

}

1458

ret = fflush(stdout);

1459

if(ret != 0){

1460

int e = errno;

1461

if(debug){

1462

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

1463

strerror(errno));

1464

}

1465

errno = e;

1466

goto mandos_end;

1467

}

1016

1468

retval = 0;

1017

1469

}

1018

1470

}

1021

1473

1022

1474

mandos_end:

1023

1475

{

1476

if(route_added){

1477

if(not delete_local_route(ip, if_index)){

1478

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

1479

" interface %d", ip, if_index);

1480

}

1481

}

1024

1482

int e = errno;

1025

1483

free(decrypted_buffer);

1026

1484

free(buffer);

1027

1485

if(tcp_sd >= 0){

1028

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

1486

ret = close(tcp_sd);

1029

1487

}

1030

1488

if(ret == -1){

1031

1489

if(e == 0){

1043

1501

return retval;

1044

1502

}

1045

1503

1046

__attribute__((nonnull))

1047

1504

static void resolve_callback(AvahiSServiceResolver *r,

1048

1505

AvahiIfIndex interface,

1049

1506

AvahiProtocol proto,

1066

1523

timed out */

1067

1524

1068

1525

if(quit_now){

1526

avahi_s_service_resolver_free(r);

1069

1527

return;

1070

1528

}

1071

1529

1185

1643

__attribute__((nonnull, warn_unused_result))

1186

1644

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

1187

1645

int ret;

1188

error_t ret_errno;

1646

int old_errno;

1189

1647

1190

1648

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

1191

1649

if(s < 0){

1192

ret_errno = errno;

1650

old_errno = errno;

1193

1651

perror_plus("socket");

1194

errno = ret_errno;

1652

errno = old_errno;

1195

1653

return false;

1196

1654

}

1197

strcpy(ifr->ifr_name, ifname);

1655

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

1656

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

1198

1657

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1658

if(ret == -1){

1200

1659

if(debug){

1201

ret_errno = errno;

1660

old_errno = errno;

1202

1661

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1662

errno = old_errno;

1663

}

1664

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

1665

old_errno = errno;

1666

perror_plus("close");

1667

errno = old_errno;

1204

1668

}

1205

1669

return false;

1206

1670

}

1671

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

1672

old_errno = errno;

1673

perror_plus("close");

1674

errno = old_errno;

1675

}

1207

1676

return true;

1208

1677

}

1209

1678

1451

1920

}

1452

1921

}

1453

1922

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

1923

__attribute__((nonnull))

1511

1924

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

1512

1925

const float delay){

1513

struct dirent **direntries;

1926

struct dirent **direntries = NULL;

1514

1927

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1928

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1929

| O_CLOEXEC);

1516

1930

if(hookdir_fd == -1){

1517

1931

if(errno == ENOENT){

1518

1932

if(debug){

1525

1939

return;

1526

1940

}

1527

1941

}

1528

#ifdef __GLIBC__

1529

#if __GLIBC_PREREQ(2, 15)

1942

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

1943

if(devnull == -1){

1944

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

1945

return;

1946

}

1530

1947

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

1531

1948

runnable_hook, alphasort);

1532

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

1533

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

1534

alphasort);

1535

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

1536

#else /* not __GLIBC__ */

1537

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

1538

alphasort);

1539

#endif /* not __GLIBC__ */

1540

1949

if(numhooks == -1){

1541

1950

perror_plus("scandir");

1951

close(devnull);

1542

1952

return;

1543

1953

}

1544

1954

struct dirent *direntry;

1545

1955

int ret;

1546

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

1547

1956

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

1548

1957

direntry = direntries[i];

1549

1958

if(debug){

1554

1963

if(hook_pid == 0){

1555

1964

/* Child */

1556

1965

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1966

errno = raise_privileges_permanently();

1967

if(errno != 0){

1558

1968

perror_plus("Failed to raise privileges");

1559

1969

_exit(EX_NOPERM);

1560

1970

}

1572

1982

perror_plus("setgroups");

1573

1983

_exit(EX_NOPERM);

1574

1984

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

1985

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

1591

1986

if(ret == -1){

1592

1987

perror_plus("setenv");

1627

2022

_exit(EX_OSERR);

1628

2023

}

1629

2024

}

1630

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

2025

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

2026

direntry->d_name,

2027

O_RDONLY));

1631

2028

if(hook_fd == -1){

1632

2029

perror_plus("openat");

1633

2030

_exit(EXIT_FAILURE);

1634

2031

}

1635

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

2032

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

1636

2033

perror_plus("close");

1637

2034

_exit(EXIT_FAILURE);

1638

2035

}

2036

ret = dup2(devnull, STDIN_FILENO);

2037

if(ret == -1){

2038

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

2039

_exit(EX_OSERR);

2040

}

2041

ret = close(devnull);

2042

if(ret == -1){

2043

perror_plus("close");

2044

_exit(EX_OSERR);

2045

}

2046

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2047

if(ret == -1){

2048

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

2049

_exit(EX_OSERR);

2050

}

1639

2051

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

1640

2052

environ) == -1){

1641

2053

perror_plus("fexecve");

1642

2054

_exit(EXIT_FAILURE);

1643

2055

}

1644

2056

} else {

2057

if(hook_pid == -1){

2058

perror_plus("fork");

2059

free(direntry);

2060

continue;

2061

}

1645

2062

int status;

1646

2063

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

1647

2064

perror_plus("waitpid");

2065

free(direntry);

1648

2066

continue;

1649

2067

}

1650

2068

if(WIFEXITED(status)){

1652

2070

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

1653

2071

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

1654

2072

WEXITSTATUS(status));

2073

free(direntry);

1655

2074

continue;

1656

2075

}

1657

2076

} else if(WIFSIGNALED(status)){

1658

2077

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

1659

2078

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

1660

2079

WTERMSIG(status));

2080

free(direntry);

1661

2081

continue;

1662

2082

} else {

1663

2083

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

1664

2084

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

2085

free(direntry);

1665

2086

continue;

1666

2087

}

1667

2088

}

1669

2090

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

1670

2091

direntry->d_name);

1671

2092

}

2093

free(direntry);

1672

2094

}

1673

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

2095

free(direntries);

2096

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

1674

2097

perror_plus("close");

1675

2098

} else {

1676

2099

hookdir_fd = -1;

1679

2102

}

1680

2103

1681

2104

__attribute__((nonnull, warn_unused_result))

1682

error_t bring_up_interface(const char *const interface,

1683

const float delay){

1684

error_t old_errno = errno;

2105

int bring_up_interface(const char *const interface,

2106

const float delay){

2107

int old_errno = errno;

1685

2108

int ret;

1686

2109

struct ifreq network;

1687

2110

unsigned int if_index = if_nametoindex(interface);

1697

2120

}

1698

2121

1699

2122

if(not interface_is_up(interface)){

1700

error_t ret_errno = 0, ioctl_errno = 0;

2123

int ret_errno = 0;

2124

int ioctl_errno = 0;

1701

2125

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

1702

2126

ret_errno = errno;

1703

2127

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

1716

2140

}

1717

2141

1718

2142

if(quit_now){

1719

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

2143

ret = close(sd);

1720

2144

if(ret == -1){

1721

2145

perror_plus("close");

1722

2146

}

1732

2156

/* Raise privileges */

1733

2157

ret_errno = raise_privileges();

1734

2158

if(ret_errno != 0){

2159

errno = ret_errno;

1735

2160

perror_plus("Failed to raise privileges");

1736

2161

}

1737

2162

1771

2196

}

1772

2197

1773

2198

/* Close the socket */

1774

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

2199

ret = close(sd);

1775

2200

if(ret == -1){

1776

2201

perror_plus("close");

1777

2202

}

1789

2214

1790

2215

/* Sleep checking until interface is running.

1791

2216

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

1792

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

2217

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

1793

2218

if(interface_is_running(interface)){

1794

2219

break;

1795

2220

}

1805

2230

}

1806

2231

1807

2232

__attribute__((nonnull, warn_unused_result))

1808

error_t take_down_interface(const char *const interface){

1809

error_t old_errno = errno;

2233

int take_down_interface(const char *const interface){

2234

int old_errno = errno;

1810

2235

struct ifreq network;

1811

2236

unsigned int if_index = if_nametoindex(interface);

1812

2237

if(if_index == 0){

1815

2240

return ENXIO;

1816

2241

}

1817

2242

if(interface_is_up(interface)){

1818

error_t ret_errno = 0, ioctl_errno = 0;

2243

int ret_errno = 0;

2244

int ioctl_errno = 0;

1819

2245

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

1820

2246

ret_errno = errno;

1821

2247

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

1841

2267

/* Raise privileges */

1842

2268

ret_errno = raise_privileges();

1843

2269

if(ret_errno != 0){

2270

errno = ret_errno;

1844

2271

perror_plus("Failed to raise privileges");

1845

2272

}

1846

2273

1858

2285

}

1859

2286

1860

2287

/* Close the socket */

1861

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

2288

int ret = close(sd);

1862

2289

if(ret == -1){

1863

2290

perror_plus("close");

1864

2291

}

1879

2306

}

1880

2307

1881

2308

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

1882

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

1883

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

1884

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

1885

.interfaces = NULL, .interfaces_size = 0 };

2309

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

2310

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

2311

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

2312

.current_server = NULL, .interfaces = NULL,

2313

.interfaces_size = 0 };

1886

2314

AvahiSServiceBrowser *sb = NULL;

1887

2315

error_t ret_errno;

1888

2316

int ret;

1897

2325

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1898

2326

const char *seckey = PATHDIR "/" SECKEY;

1899

2327

const char *pubkey = PATHDIR "/" PUBKEY;

2328

const char *dh_params_file = NULL;

1900

2329

char *interfaces_hooks = NULL;

1901

2330

1902

2331

bool gnutls_initialized = false;

1955

2384

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

1956

2385

" Diffie-Hellman key exchange",

1957

2386

.group = 2 },

2387

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

2388

.arg = "FILE",

2389

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

2390

" for the Diffie-Hellman key exchange",

2391

.group = 2 },

1958

2392

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

1959

2393

.arg = "STRING",

1960

2394

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

2015

2449

}

2016

2450

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

2017

2451

break;

2452

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

2453

dh_params_file = arg;

2454

break;

2018

2455

case 130: /* --priority */

2019

2456

mc.priority = arg;

2020

2457

break;

2060

2497

.args_doc = "",

2061

2498

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

2062

2499

" passwords from a Mandos server" };

2063

ret = argp_parse(&argp, argc, argv,

2064

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2065

switch(ret){

2500

ret_errno = argp_parse(&argp, argc, argv,

2501

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2502

switch(ret_errno){

2066

2503

case 0:

2067

2504

break;

2068

2505

case ENOMEM:

2069

2506

default:

2070

errno = ret;

2507

errno = ret_errno;

2071

2508

perror_plus("argp_parse");

2072

2509

exitcode = EX_OSERR;

2073

2510

goto end;

2076

2513

goto end;

2077

2514

}

2078

2515

}

2079

2516

2080

2517

{

2081

2518

/* Work around Debian bug #633582:

2082

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

2519

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

2083

2520

2084

2521

/* Re-raise privileges */

2085

ret_errno = raise_privileges();

2086

if(ret_errno != 0){

2087

errno = ret_errno;

2522

ret = raise_privileges();

2523

if(ret != 0){

2524

errno = ret;

2088

2525

perror_plus("Failed to raise privileges");

2089

2526

} else {

2090

2527

struct stat st;

2106

2543

}

2107

2544

}

2108

2545

}

2109

TEMP_FAILURE_RETRY(close(seckey_fd));

2546

close(seckey_fd);

2110

2547

}

2111

2548

}

2112

2549

2113

2550

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

2114

2551

int pubkey_fd = open(pubkey, O_RDONLY);

2115

2552

if(pubkey_fd == -1){

2127

2564

}

2128

2565

}

2129

2566

}

2130

TEMP_FAILURE_RETRY(close(pubkey_fd));

2131

}

2132

}

2133

2567

close(pubkey_fd);

2568

}

2569

}

2570

2571

if(dh_params_file != NULL

2572

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

2573

int dhparams_fd = open(dh_params_file, O_RDONLY);

2574

if(dhparams_fd == -1){

2575

perror_plus("open");

2576

} else {

2577

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

2578

if(ret == -1){

2579

perror_plus("fstat");

2580

} else {

2581

if(S_ISREG(st.st_mode)

2582

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

2583

ret = fchown(dhparams_fd, uid, gid);

2584

if(ret == -1){

2585

perror_plus("fchown");

2586

}

2587

}

2588

}

2589

close(dhparams_fd);

2590

}

2591

}

2592

2134

2593

/* Lower privileges */

2135

ret_errno = lower_privileges();

2136

if(ret_errno != 0){

2137

errno = ret_errno;

2594

ret = lower_privileges();

2595

if(ret != 0){

2596

errno = ret;

2138

2597

perror_plus("Failed to lower privileges");

2139

2598

}

2140

2599

}

2253

2712

2254

2713

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

2255

2714

if(mc.interfaces == NULL){

2256

struct dirent **direntries;

2715

struct dirent **direntries = NULL;

2257

2716

/* Look for any good interfaces */

2258

2717

ret = scandir(sys_class_net, &direntries, good_interface,

2259

2718

alphasort);

2265

2724

if(ret_errno != 0){

2266

2725

errno = ret_errno;

2267

2726

perror_plus("argz_add");

2727

free(direntries[i]);

2268

2728

continue;

2269

2729

}

2270

2730

if(debug){

2271

2731

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

2272

2732

direntries[i]->d_name);

2273

2733

}

2734

free(direntries[i]);

2274

2735

}

2275

2736

free(direntries);

2276

2737

} else {

2277

free(direntries);

2738

if(ret == 0){

2739

free(direntries);

2740

}

2278

2741

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

2279

2742

exitcode = EXIT_FAILURE;

2280

2743

goto end;

2306

2769

errno = bring_up_interface(interface, delay);

2307

2770

if(not interface_was_up){

2308

2771

if(errno != 0){

2309

perror_plus("Failed to bring up interface");

2772

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

2773

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

2310

2774

} else {

2311

2775

errno = argz_add(&interfaces_to_take_down,

2312

2776

&interfaces_to_take_down_size,

2335

2799

goto end;

2336

2800

}

2337

2801

2338

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

2802

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

2339

2803

if(ret == -1){

2340

2804

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

2341

2805

exitcode = EX_UNAVAILABLE;

2463

2927

2464

2928

/* Allocate a new server */

2465

2929

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2466

&config, NULL, NULL, &ret_errno);

2930

&config, NULL, NULL, &ret);

2467

2931

2468

2932

/* Free the Avahi configuration data */

2469

2933

avahi_server_config_free(&config);

2472

2936

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

2473

2937

if(mc.server == NULL){

2474

2938

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

2475

avahi_strerror(ret_errno));

2939

avahi_strerror(ret));

2476

2940

exitcode = EX_UNAVAILABLE;

2477

2941

goto end;

2478

2942

}

2513

2977

end:

2514

2978

2515

2979

if(debug){

2516

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

2980

if(signal_received){

2981

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

2982

argv[0], signal_received,

2983

strsignal(signal_received));

2984

} else {

2985

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

2986

}

2517

2987

}

2518

2988

2519

2989

/* Cleanup things */

2530

3000

2531

3001

if(gnutls_initialized){

2532

3002

gnutls_certificate_free_credentials(mc.cred);

2533

gnutls_global_deinit();

2534

3003

gnutls_dh_params_deinit(mc.dh_params);

2535

3004

}

2536

3005

2544

3013

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

2545

3014

while(mc.current_server != NULL){

2546

3015

server *next = mc.current_server->next;

3016

#ifdef __GNUC__

3017

#pragma GCC diagnostic push

3018

#pragma GCC diagnostic ignored "-Wcast-qual"

3019

#endif

3020

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

3021

#ifdef __GNUC__

3022

#pragma GCC diagnostic pop

3023

#endif

2547

3024

free(mc.current_server);

2548

3025

mc.current_server = next;

2549

3026

}

2551

3028

2552

3029

/* Re-raise privileges */

2553

3030

{

2554

ret_errno = raise_privileges();

2555

if(ret_errno != 0){

3031

ret = raise_privileges();

3032

if(ret != 0){

3033

errno = ret;

2556

3034

perror_plus("Failed to raise privileges");

2557

3035

} else {

2558

3036

2563

3041

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

2564

3042

{

2565

3043

char *interface = NULL;

2566

while((interface=argz_next(interfaces_to_take_down,

2567

interfaces_to_take_down_size,

2568

interface))){

2569

ret_errno = take_down_interface(interface);

2570

if(ret_errno != 0){

2571

errno = ret_errno;

3044

while((interface = argz_next(interfaces_to_take_down,

3045

interfaces_to_take_down_size,

3046

interface))){

3047

ret = take_down_interface(interface);

3048

if(ret != 0){

3049

errno = ret;

2572

3050

perror_plus("Failed to take down interface");

2573

3051

}

2574

3052

}

2579

3057

}

2580

3058

}

2581

3059

2582

ret_errno = lower_privileges_permanently();

2583

if(ret_errno != 0){

3060

ret = lower_privileges_permanently();

3061

if(ret != 0){

3062

errno = ret;

2584

3063

perror_plus("Failed to lower privileges permanently");

2585

3064

}

2586

3065

}

2588

3067

free(interfaces_to_take_down);

2589

3068

free(interfaces_hooks);

2590

3069

3070

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

3071

uintmax_t level){

3072

struct dirent **direntries = NULL;

3073

int dret;

3074

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

3075

O_RDONLY

3076

| O_NOFOLLOW

3077

| O_DIRECTORY

3078

| O_PATH));

3079

if(dir_fd == -1){

3080

perror_plus("open");

3081

return;

3082

}

3083

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

3084

notdotentries, alphasort);

3085

if(numentries >= 0){

3086

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

3087

if(debug){

3088

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

3089

dirname, direntries[i]->d_name);

3090

}

3091

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

3092

if(dret == -1){

3093

if(errno == EISDIR){

3094

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

3095

AT_REMOVEDIR);

3096

}

3097

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

3098

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

3099

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

3100

/* Recurse only in this special case */

3101

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

3102

dret = 0;

3103

}

3104

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

3105

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

3106

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

3107

}

3108

}

3109

free(direntries[i]);

3110

}

3111

3112

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

3113

free(direntries);

3114

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3115

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

3116

perror_plus("rmdir");

3117

}

3118

} else {

3119

perror_plus("scandirat");

3120

}

3121

close(dir_fd);

3122

}

3123

2591

3124

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

2592

3125

if(tempdir != NULL){

2593

struct dirent **direntries = NULL;

2594

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

2595

if(tempdir_fd == -1){

2596

perror_plus("open");

2597

} else {

2598

#ifdef __GLIBC__

2599

#if __GLIBC_PREREQ(2, 15)

2600

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

2601

notdotentries, alphasort);

2602

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

2603

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

2604

alphasort);

2605

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

2606

#else /* not __GLIBC__ */

2607

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

2608

alphasort);

2609

#endif /* not __GLIBC__ */

2610

if(numentries > 0){

2611

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

2612

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

2613

if(ret == -1){

2614

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

2615

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

2616

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

2617

}

2618

}

2619

2620

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

2621

free(direntries);

2622

if(numentries == -1){

2623

perror_plus("scandir");

2624

}

2625

ret = rmdir(tempdir);

2626

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

2627

perror_plus("rmdir");

2628

}

2629

}

2630

TEMP_FAILURE_RETRY(close(tempdir_fd));

2631

}

3126

clean_dir_at(-1, tempdir, 0);

2632

3127

}

2633

3128

2634

3129

if(quit_now){