/mandos/release : revision 237.7.446

9

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

10

*

11

* Everything else is

12

13

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

46

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

47

strtof(), abort() */

48

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

49

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

50

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

49

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

50

asprintf(), strncpy(), strsignal()

51

*/

51

52

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

52

53

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

53

54

sockaddr_in6, PF_INET6,

57

58

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

58

59

inet_pton(), connect(),

59

60

getnameinfo() */

60

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

61

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

61

62

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

62

63

*/

63

64

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

64

65

strtoimax() */

65

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

66

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

67

EAI_SYSTEM, ENETUNREACH,

68

EHOSTUNREACH, ECONNREFUSED, EPROTO,

69

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

70

ENOTEMPTY,

66

71

program_invocation_short_name */

67

72

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

68

73

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

234

239

.af = af };

235

240

if(new_server->ip == NULL){

236

241

perror_plus("strdup");

242

free(new_server);

237

243

return false;

238

244

}

239

245

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

240

246

if(ret == -1){

241

247

perror_plus("clock_gettime");

248

#ifdef __GNUC__

249

#pragma GCC diagnostic push

250

#pragma GCC diagnostic ignored "-Wcast-qual"

251

#endif

252

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

253

#ifdef __GNUC__

254

#pragma GCC diagnostic pop

255

#endif

256

free(new_server);

242

257

return false;

243

258

}

244

259

/* Special case of first server */

295

310

return false;

296

311

}

297

312

298

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

313

ret = close(fd);

299

314

if(ret == -1){

300

315

perror_plus("close");

301

316

}

483

498

return plaintext_length;

484

499

}

485

500

501

__attribute__((warn_unused_result, const))

502

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

503

if(str == NULL)

504

return "(unknown)";

505

return str;

506

}

507

486

508

__attribute__((warn_unused_result))

487

509

static const char *safer_gnutls_strerror(int value){

488

510

const char *ret = gnutls_strerror(value);

489

if(ret == NULL)

490

ret = "(unknown)";

491

return ret;

511

return safe_string(ret);

492

512

}

493

513

494

514

/* GnuTLS log function callback */

498

518

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

499

519

}

500

520

501

__attribute__((nonnull, warn_unused_result))

521

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

502

522

static int init_gnutls_global(const char *pubkeyfilename,

503

523

const char *seckeyfilename,

524

const char *dhparamsfilename,

504

525

mandos_context *mc){

505

526

int ret;

527

unsigned int uret;

506

528

507

529

if(debug){

508

530

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

509

531

}

510

532

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

533

if(debug){

519

534

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

520

535

* - GnuTLS manual

528

543

if(ret != GNUTLS_E_SUCCESS){

529

544

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

530

545

safer_gnutls_strerror(ret));

531

gnutls_global_deinit();

532

546

return -1;

533

547

}

534

548

559

573

safer_gnutls_strerror(ret));

560

574

goto globalfail;

561

575

}

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

576

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

577

if(dhparamsfilename != NULL){

578

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

579

do {

580

int dhpfile = open(dhparamsfilename, O_RDONLY);

581

if(dhpfile == -1){

582

perror_plus("open");

583

dhparamsfilename = NULL;

584

break;

585

}

586

size_t params_capacity = 0;

587

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

592

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

596

break;

597

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

600

BUFFER_SIZE);

601

/* EOF */

602

if(bytes_read == 0){

603

break;

604

}

605

/* check bytes_read for failure */

606

if(bytes_read < 0){

607

perror_plus("read");

608

free(params.data);

609

params.data = NULL;

610

dhparamsfilename = NULL;

611

break;

612

}

613

params.size += (unsigned int)bytes_read;

614

}

615

if(params.data == NULL){

616

dhparamsfilename = NULL;

617

}

618

if(dhparamsfilename == NULL){

619

break;

620

}

621

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

622

GNUTLS_X509_FMT_PEM);

623

if(ret != GNUTLS_E_SUCCESS){

624

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

625

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

626

safer_gnutls_strerror(ret));

627

dhparamsfilename = NULL;

628

}

629

free(params.data);

630

} while(false);

631

}

632

if(dhparamsfilename == NULL){

633

if(mc->dh_bits == 0){

634

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

635

/* Try to read the private key file */

636

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

637

do {

638

int secfile = open(seckeyfilename, O_RDONLY);

639

if(secfile == -1){

640

perror_plus("open");

641

break;

642

}

643

size_t buffer_capacity = 0;

644

while(true){

645

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

646

(size_t)buffer.size,

647

(size_t)buffer_capacity);

648

if(buffer_capacity == 0){

649

perror_plus("incbuffer");

650

free(buffer.data);

651

buffer.data = NULL;

652

break;

653

}

654

ssize_t bytes_read = read(secfile,

655

buffer.data + buffer.size,

656

BUFFER_SIZE);

657

/* EOF */

658

if(bytes_read == 0){

659

break;

660

}

661

/* check bytes_read for failure */

662

if(bytes_read < 0){

663

perror_plus("read");

664

free(buffer.data);

665

buffer.data = NULL;

666

break;

667

}

668

buffer.size += (unsigned int)bytes_read;

669

}

670

close(secfile);

671

} while(false);

672

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

673

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

674

if(buffer.data != NULL){

675

{

676

gnutls_openpgp_privkey_t privkey = NULL;

677

ret = gnutls_openpgp_privkey_init(&privkey);

678

if(ret != GNUTLS_E_SUCCESS){

679

fprintf_plus(stderr, "Error initializing OpenPGP key"

680

" structure: %s",

681

safer_gnutls_strerror(ret));

682

free(buffer.data);

683

buffer.data = NULL;

684

} else {

685

ret = gnutls_openpgp_privkey_import

686

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

687

if(ret != GNUTLS_E_SUCCESS){

688

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

689

safer_gnutls_strerror(ret));

690

privkey = NULL;

691

}

692

free(buffer.data);

693

buffer.data = NULL;

694

if(privkey != NULL){

695

/* Use private key to suggest an appropriate

696

sec_param */

697

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

698

gnutls_openpgp_privkey_deinit(privkey);

699

if(debug){

700

fprintf_plus(stderr, "This OpenPGP key implies using"

701

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

702

safe_string(gnutls_sec_param_get_name

703

(sec_param)));

704

}

705

}

706

}

707

}

708

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

709

/* Err on the side of caution */

710

sec_param = GNUTLS_SEC_PARAM_ULTRA;

711

if(debug){

712

fprintf_plus(stderr, "Falling back to security parameter"

713

" \"%s\"\n",

714

safe_string(gnutls_sec_param_get_name

715

(sec_param)));

716

}

717

}

718

}

719

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

720

if(uret != 0){

721

mc->dh_bits = uret;

722

if(debug){

723

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

724

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

725

safe_string(gnutls_sec_param_get_name

726

(sec_param)),

727

mc->dh_bits);

728

}

729

} else {

730

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

731

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

732

safe_string(gnutls_sec_param_get_name

733

(sec_param)),

734

safer_gnutls_strerror(ret));

735

goto globalfail;

736

}

737

} else if(debug){

738

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

739

mc->dh_bits);

740

}

741

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

742

if(ret != GNUTLS_E_SUCCESS){

743

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

744

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

745

safer_gnutls_strerror(ret));

746

goto globalfail;

747

}

748

}

569

749

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

570

750

571

751

return 0;

573

753

globalfail:

574

754

575

755

gnutls_certificate_free_credentials(mc->cred);

576

gnutls_global_deinit();

577

756

gnutls_dh_params_deinit(mc->dh_params);

578

757

return -1;

579

758

}

631

810

/* ignore client certificate if any. */

632

811

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

812

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

635

636

813

return 0;

637

814

}

638

815

640

817

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

641

818

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

642

819

820

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

821

__attribute__((warn_unused_result))

822

int raise_privileges(void){

823

int old_errno = errno;

824

int ret = 0;

825

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

826

ret = errno;

827

}

828

errno = old_errno;

829

return ret;

830

}

831

832

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

833

__attribute__((warn_unused_result))

834

int raise_privileges_permanently(void){

835

int old_errno = errno;

836

int ret = raise_privileges();

837

if(ret != 0){

838

errno = old_errno;

839

return ret;

840

}

841

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

842

ret = errno;

843

}

844

errno = old_errno;

845

return ret;

846

}

847

848

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

849

__attribute__((warn_unused_result))

850

int lower_privileges(void){

851

int old_errno = errno;

852

int ret = 0;

853

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

854

ret = errno;

855

}

856

errno = old_errno;

857

return ret;

858

}

859

860

/* Lower privileges permanently */

861

__attribute__((warn_unused_result))

862

int lower_privileges_permanently(void){

863

int old_errno = errno;

864

int ret = 0;

865

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

866

ret = errno;

867

}

868

errno = old_errno;

869

return ret;

870

}

871

872

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

873

__attribute__((nonnull, warn_unused_result))

874

static bool add_delete_local_route(const bool add,

875

const char *address,

876

AvahiIfIndex if_index){

877

int ret;

878

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

879

char add_arg[] = "add";

880

char delete_arg[] = "delete";

881

char debug_flag[] = "--debug";

882

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

883

if(pluginhelperdir == NULL){

884

if(debug){

885

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

886

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

887

}

888

return false;

889

}

890

891

char interface[IF_NAMESIZE];

892

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

893

perror_plus("if_indextoname");

894

return false;

895

}

896

897

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

898

if(devnull == -1){

899

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

900

return false;

901

}

902

pid_t pid = fork();

903

if(pid == 0){

904

/* Child */

905

/* Raise privileges */

906

errno = raise_privileges_permanently();

907

if(errno != 0){

908

perror_plus("Failed to raise privileges");

909

/* _exit(EX_NOPERM); */

910

} else {

911

/* Set group */

912

errno = 0;

913

ret = setgid(0);

914

if(ret == -1){

915

perror_plus("setgid");

916

_exit(EX_NOPERM);

917

}

918

/* Reset supplementary groups */

919

errno = 0;

920

ret = setgroups(0, NULL);

921

if(ret == -1){

922

perror_plus("setgroups");

923

_exit(EX_NOPERM);

924

}

925

}

926

ret = dup2(devnull, STDIN_FILENO);

927

if(ret == -1){

928

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

929

_exit(EX_OSERR);

930

}

931

ret = close(devnull);

932

if(ret == -1){

933

perror_plus("close");

934

_exit(EX_OSERR);

935

}

936

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

937

if(ret == -1){

938

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

939

_exit(EX_OSERR);

940

}

941

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

942

O_RDONLY

943

| O_DIRECTORY

944

| O_PATH

945

| O_CLOEXEC));

946

if(helperdir_fd == -1){

947

perror_plus("open");

948

_exit(EX_UNAVAILABLE);

949

}

950

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

951

helper, O_RDONLY));

952

if(helper_fd == -1){

953

perror_plus("openat");

954

close(helperdir_fd);

955

_exit(EX_UNAVAILABLE);

956

}

957

close(helperdir_fd);

958

#ifdef __GNUC__

959

#pragma GCC diagnostic push

960

#pragma GCC diagnostic ignored "-Wcast-qual"

961

#endif

962

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

963

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

964

interface, debug ? debug_flag : NULL, NULL },

965

environ) == -1){

966

#ifdef __GNUC__

967

#pragma GCC diagnostic pop

968

#endif

969

perror_plus("fexecve");

970

_exit(EXIT_FAILURE);

971

}

972

}

973

if(pid == -1){

974

perror_plus("fork");

975

return false;

976

}

977

int status;

978

pid_t pret = -1;

979

errno = 0;

980

do {

981

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

982

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

983

int errno_raising = 0;

984

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

985

errno_raising = errno;

986

perror_plus("Failed to raise privileges in order to"

987

" kill helper program");

988

}

989

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

990

perror_plus("kill");

991

}

992

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

993

perror_plus("Failed to lower privileges after killing"

994

" helper program");

995

}

996

return false;

997

}

998

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

999

if(pret == -1){

1000

perror_plus("waitpid");

1001

return false;

1002

}

1003

if(WIFEXITED(status)){

1004

if(WEXITSTATUS(status) != 0){

1005

fprintf_plus(stderr, "Error: iprouteadddel exited"

1006

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

1007

return false;

1008

}

1009

return true;

1010

}

1011

if(WIFSIGNALED(status)){

1012

fprintf_plus(stderr, "Error: iprouteadddel died by"

1013

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

1014

return false;

1015

}

1016

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

1017

return false;

1018

}

1019

1020

__attribute__((nonnull, warn_unused_result))

1021

static bool add_local_route(const char *address,

1022

AvahiIfIndex if_index){

1023

if(debug){

1024

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

1025

}

1026

return add_delete_local_route(true, address, if_index);

1027

}

1028

1029

__attribute__((nonnull, warn_unused_result))

1030

static bool delete_local_route(const char *address,

1031

AvahiIfIndex if_index){

1032

if(debug){

1033

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

1034

}

1035

return add_delete_local_route(false, address, if_index);

1036

}

1037

643

1038

/* Called when a Mandos server is found */

644

1039

__attribute__((nonnull, warn_unused_result))

645

1040

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

656

1051

int retval = -1;

657

1052

gnutls_session_t session;

658

1053

int pf; /* Protocol family */

1054

bool route_added = false;

659

1055

660

1056

errno = 0;

661

1057

683

1079

bool match = false;

684

1080

{

685

1081

char *interface = NULL;

686

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

687

interface))){

1082

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

1083

mc->interfaces_size,

1084

interface))){

688

1085

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

689

1086

match = true;

690

1087

break;

719

1116

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

720

1117

}

721

1118

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

1119

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

723

1120

if(tcp_sd < 0){

724

1121

int e = errno;

725

1122

perror_plus("socket");

732

1129

goto mandos_end;

733

1130

}

734

1131

735

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

736

1132

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);

1133

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

1134

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

1135

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

739

1136

} 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);

1137

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

1138

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

1139

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

742

1140

}

743

1141

if(ret < 0 ){

744

1142

int e = errno;

814

1212

goto mandos_end;

815

1213

}

816

1214

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;

1215

while(true){

1216

if(af == AF_INET6){

1217

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

1218

sizeof(struct sockaddr_in6));

1219

} else {

1220

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

1221

sizeof(struct sockaddr_in));

1222

}

1223

if(ret < 0){

1224

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

1225

and if_index != AVAHI_IF_UNSPEC

1226

and connect_to == NULL

1227

and not route_added and

1228

((af == AF_INET6 and not

1229

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1230

&to)->sin6_addr)))

1231

or (af == AF_INET and

1232

/* Not a a IPv4LL address */

1233

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

1234

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

1235

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

1236

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

1237

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

1238

connect to a Mandos server announced by Avahi on a server

1239

host with a global address. Work around this by retrying

1240

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

1241

1242

Avahi bug reference:

1243

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

1244

https://bugs.debian.org/587961

1245

*/

1246

if(debug){

1247

fprintf_plus(stderr, "Mandos server unreachable, trying"

1248

" direct route\n");

1249

}

1250

int e = errno;

1251

route_added = add_local_route(ip, if_index);

1252

if(route_added){

1253

continue;

1254

}

1255

errno = e;

1256

}

1257

if(errno != ECONNREFUSED or debug){

1258

int e = errno;

1259

perror_plus("connect");

1260

errno = e;

1261

}

1262

goto mandos_end;

1263

}

1264

1265

if(quit_now){

1266

errno = EINTR;

1267

goto mandos_end;

1268

}

1269

break;

836

1270

}

837

1271

838

1272

const char *out = mandos_protocol_version;

992

1426

&decrypted_buffer, mc);

993

1427

if(decrypted_buffer_size >= 0){

994

1428

1429

clearerr(stdout);

995

1430

written = 0;

996

1431

while(written < (size_t) decrypted_buffer_size){

997

1432

if(quit_now){

1013

1448

}

1014

1449

written += (size_t)ret;

1015

1450

}

1451

ret = fflush(stdout);

1452

if(ret != 0){

1453

int e = errno;

1454

if(debug){

1455

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

1456

strerror(errno));

1457

}

1458

errno = e;

1459

goto mandos_end;

1460

}

1016

1461

retval = 0;

1017

1462

}

1018

1463

}

1021

1466

1022

1467

mandos_end:

1023

1468

{

1469

if(route_added){

1470

if(not delete_local_route(ip, if_index)){

1471

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

1472

" interface %d", ip, if_index);

1473

}

1474

}

1024

1475

int e = errno;

1025

1476

free(decrypted_buffer);

1026

1477

free(buffer);

1027

1478

if(tcp_sd >= 0){

1028

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

1479

ret = close(tcp_sd);

1029

1480

}

1030

1481

if(ret == -1){

1031

1482

if(e == 0){

1043

1494

return retval;

1044

1495

}

1045

1496

1046

__attribute__((nonnull))

1047

1497

static void resolve_callback(AvahiSServiceResolver *r,

1048

1498

AvahiIfIndex interface,

1049

1499

AvahiProtocol proto,

1066

1516

timed out */

1067

1517

1068

1518

if(quit_now){

1519

avahi_s_service_resolver_free(r);

1069

1520

return;

1070

1521

}

1071

1522

1185

1636

__attribute__((nonnull, warn_unused_result))

1186

1637

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

1187

1638

int ret;

1188

error_t ret_errno;

1639

int old_errno;

1189

1640

1190

1641

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

1191

1642

if(s < 0){

1192

ret_errno = errno;

1643

old_errno = errno;

1193

1644

perror_plus("socket");

1194

errno = ret_errno;

1645

errno = old_errno;

1195

1646

return false;

1196

1647

}

1197

strcpy(ifr->ifr_name, ifname);

1648

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

1649

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

1198

1650

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1651

if(ret == -1){

1200

1652

if(debug){

1201

ret_errno = errno;

1653

old_errno = errno;

1202

1654

perror_plus("ioctl SIOCGIFFLAGS");

1203

errno = ret_errno;

1655

errno = old_errno;

1204

1656

}

1205

1657

return false;

1206

1658

}

1451

1903

}

1452

1904

}

1453

1905

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

#ifndef O_CLOEXEC

1511

/*

1512

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

1513

* Descriptor Flags".

1514

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

1515

*/

1516

__attribute__((warn_unused_result))

1517

static int set_cloexec_flag(int fd){

1518

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

1519

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

1520

if(ret < 0){

1521

return ret;

1522

}

1523

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

1524

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

1525

ret | FD_CLOEXEC));

1526

}

1527

#endif /* not O_CLOEXEC */

1528

1529

1906

__attribute__((nonnull))

1530

1907

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

1531

1908

const float delay){

1532

struct dirent **direntries;

1909

struct dirent **direntries = NULL;

1533

1910

if(hookdir_fd == -1){

1534

hookdir_fd = open(hookdir, O_RDONLY |

1535

#ifdef O_CLOEXEC

1536

O_CLOEXEC

1537

#else /* not O_CLOEXEC */

1538

0

1539

#endif /* not O_CLOEXEC */

1540

);

1911

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1912

| O_CLOEXEC);

1541

1913

if(hookdir_fd == -1){

1542

1914

if(errno == ENOENT){

1543

1915

if(debug){

1549

1921

}

1550

1922

return;

1551

1923

}

1552

#ifndef O_CLOEXEC

1553

if(set_cloexec_flag(hookdir_fd) < 0){

1554

perror_plus("set_cloexec_flag");

1555

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

1556

perror_plus("close");

1557

} else {

1558

hookdir_fd = -1;

1559

}

1560

return;

1561

}

1562

#endif /* not O_CLOEXEC */

1563

1924

}

1564

#ifdef __GLIBC__

1565

#if __GLIBC_PREREQ(2, 15)

1566

1925

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

1567

1926

runnable_hook, alphasort);

1568

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

1569

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

1570

alphasort);

1571

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

1572

#else /* not __GLIBC__ */

1573

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

1574

alphasort);

1575

#endif /* not __GLIBC__ */

1576

1927

if(numhooks == -1){

1577

1928

perror_plus("scandir");

1578

1929

return;

1579

1930

}

1580

1931

struct dirent *direntry;

1581

1932

int ret;

1582

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

1933

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

1934

if(devnull == -1){

1935

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

1936

return;

1937

}

1583

1938

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

1584

1939

direntry = direntries[i];

1585

1940

if(debug){

1590

1945

if(hook_pid == 0){

1591

1946

/* Child */

1592

1947

/* Raise privileges */

1593

if(raise_privileges_permanently() != 0){

1948

errno = raise_privileges_permanently();

1949

if(errno != 0){

1594

1950

perror_plus("Failed to raise privileges");

1595

1951

_exit(EX_NOPERM);

1596

1952

}

1608

1964

perror_plus("setgroups");

1609

1965

_exit(EX_NOPERM);

1610

1966

}

1611

ret = dup2(devnull, STDIN_FILENO);

1612

if(ret == -1){

1613

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

1614

_exit(EX_OSERR);

1615

}

1616

ret = close(devnull);

1617

if(ret == -1){

1618

perror_plus("close");

1619

_exit(EX_OSERR);

1620

}

1621

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1622

if(ret == -1){

1623

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

1624

_exit(EX_OSERR);

1625

}

1626

1967

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

1627

1968

if(ret == -1){

1628

1969

perror_plus("setenv");

1663

2004

_exit(EX_OSERR);

1664

2005

}

1665

2006

}

1666

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

1667

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

2007

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

2008

direntry->d_name,

2009

O_RDONLY));

2010

if(hook_fd == -1){

2011

perror_plus("openat");

2012

_exit(EXIT_FAILURE);

2013

}

2014

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

2015

perror_plus("close");

2016

_exit(EXIT_FAILURE);

2017

}

2018

ret = dup2(devnull, STDIN_FILENO);

2019

if(ret == -1){

2020

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

2021

_exit(EX_OSERR);

2022

}

2023

ret = close(devnull);

2024

if(ret == -1){

2025

perror_plus("close");

2026

_exit(EX_OSERR);

2027

}

2028

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2029

if(ret == -1){

2030

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

2031

_exit(EX_OSERR);

2032

}

2033

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

2034

environ) == -1){

1668

2035

perror_plus("fexecve");

1669

2036

_exit(EXIT_FAILURE);

1670

2037

}

1671

2038

} else {

2039

if(hook_pid == -1){

2040

perror_plus("fork");

2041

free(direntry);

2042

continue;

2043

}

1672

2044

int status;

1673

2045

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

1674

2046

perror_plus("waitpid");

2047

free(direntry);

1675

2048

continue;

1676

2049

}

1677

2050

if(WIFEXITED(status)){

1679

2052

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

1680

2053

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

1681

2054

WEXITSTATUS(status));

2055

free(direntry);

1682

2056

continue;

1683

2057

}

1684

2058

} else if(WIFSIGNALED(status)){

1685

2059

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

1686

2060

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

1687

2061

WTERMSIG(status));

2062

free(direntry);

1688

2063

continue;

1689

2064

} else {

1690

2065

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

1691

2066

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

2067

free(direntry);

1692

2068

continue;

1693

2069

}

1694

2070

}

1696

2072

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

1697

2073

direntry->d_name);

1698

2074

}

2075

free(direntry);

1699

2076

}

1700

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

2077

free(direntries);

2078

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

1701

2079

perror_plus("close");

1702

2080

} else {

1703

2081

hookdir_fd = -1;

1706

2084

}

1707

2085

1708

2086

__attribute__((nonnull, warn_unused_result))

1709

error_t bring_up_interface(const char *const interface,

1710

const float delay){

1711

error_t old_errno = errno;

2087

int bring_up_interface(const char *const interface,

2088

const float delay){

2089

int old_errno = errno;

1712

2090

int ret;

1713

2091

struct ifreq network;

1714

2092

unsigned int if_index = if_nametoindex(interface);

1724

2102

}

1725

2103

1726

2104

if(not interface_is_up(interface)){

1727

error_t ret_errno = 0, ioctl_errno = 0;

2105

int ret_errno = 0;

2106

int ioctl_errno = 0;

1728

2107

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

1729

2108

ret_errno = errno;

1730

2109

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

1743

2122

}

1744

2123

1745

2124

if(quit_now){

1746

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

2125

ret = close(sd);

1747

2126

if(ret == -1){

1748

2127

perror_plus("close");

1749

2128

}

1759

2138

/* Raise privileges */

1760

2139

ret_errno = raise_privileges();

1761

2140

if(ret_errno != 0){

2141

errno = ret_errno;

1762

2142

perror_plus("Failed to raise privileges");

1763

2143

}

1764

2144

1798

2178

}

1799

2179

1800

2180

/* Close the socket */

1801

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

2181

ret = close(sd);

1802

2182

if(ret == -1){

1803

2183

perror_plus("close");

1804

2184

}

1816

2196

1817

2197

/* Sleep checking until interface is running.

1818

2198

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

1819

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

2199

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

1820

2200

if(interface_is_running(interface)){

1821

2201

break;

1822

2202

}

1832

2212

}

1833

2213

1834

2214

__attribute__((nonnull, warn_unused_result))

1835

error_t take_down_interface(const char *const interface){

1836

error_t old_errno = errno;

2215

int take_down_interface(const char *const interface){

2216

int old_errno = errno;

1837

2217

struct ifreq network;

1838

2218

unsigned int if_index = if_nametoindex(interface);

1839

2219

if(if_index == 0){

1842

2222

return ENXIO;

1843

2223

}

1844

2224

if(interface_is_up(interface)){

1845

error_t ret_errno = 0, ioctl_errno = 0;

2225

int ret_errno = 0;

2226

int ioctl_errno = 0;

1846

2227

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

1847

2228

ret_errno = errno;

1848

2229

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

1868

2249

/* Raise privileges */

1869

2250

ret_errno = raise_privileges();

1870

2251

if(ret_errno != 0){

2252

errno = ret_errno;

1871

2253

perror_plus("Failed to raise privileges");

1872

2254

}

1873

2255

1885

2267

}

1886

2268

1887

2269

/* Close the socket */

1888

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

2270

int ret = close(sd);

1889

2271

if(ret == -1){

1890

2272

perror_plus("close");

1891

2273

}

1906

2288

}

1907

2289

1908

2290

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

1909

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

1910

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

1911

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

1912

.interfaces = NULL, .interfaces_size = 0 };

2291

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

2292

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

2293

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

2294

.current_server = NULL, .interfaces = NULL,

2295

.interfaces_size = 0 };

1913

2296

AvahiSServiceBrowser *sb = NULL;

1914

2297

error_t ret_errno;

1915

2298

int ret;

1924

2307

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1925

2308

const char *seckey = PATHDIR "/" SECKEY;

1926

2309

const char *pubkey = PATHDIR "/" PUBKEY;

2310

const char *dh_params_file = NULL;

1927

2311

char *interfaces_hooks = NULL;

1928

2312

1929

2313

bool gnutls_initialized = false;

1982

2366

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

1983

2367

" Diffie-Hellman key exchange",

1984

2368

.group = 2 },

2369

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

2370

.arg = "FILE",

2371

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

2372

" for the Diffie-Hellman key exchange",

2373

.group = 2 },

1985

2374

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

1986

2375

.arg = "STRING",

1987

2376

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

2042

2431

}

2043

2432

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

2044

2433

break;

2434

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

2435

dh_params_file = arg;

2436

break;

2045

2437

case 130: /* --priority */

2046

2438

mc.priority = arg;

2047

2439

break;

2087

2479

.args_doc = "",

2088

2480

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

2089

2481

" passwords from a Mandos server" };

2090

ret = argp_parse(&argp, argc, argv,

2091

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2092

switch(ret){

2482

ret_errno = argp_parse(&argp, argc, argv,

2483

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2484

switch(ret_errno){

2093

2485

case 0:

2094

2486

break;

2095

2487

case ENOMEM:

2096

2488

default:

2097

errno = ret;

2489

errno = ret_errno;

2098

2490

perror_plus("argp_parse");

2099

2491

exitcode = EX_OSERR;

2100

2492

goto end;

2103

2495

goto end;

2104

2496

}

2105

2497

}

2106

2498

2107

2499

{

2108

2500

/* Work around Debian bug #633582:

2109

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

2501

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

2110

2502

2111

2503

/* Re-raise privileges */

2112

ret_errno = raise_privileges();

2113

if(ret_errno != 0){

2114

errno = ret_errno;

2504

ret = raise_privileges();

2505

if(ret != 0){

2506

errno = ret;

2115

2507

perror_plus("Failed to raise privileges");

2116

2508

} else {

2117

2509

struct stat st;

2133

2525

}

2134

2526

}

2135

2527

}

2136

TEMP_FAILURE_RETRY(close(seckey_fd));

2528

close(seckey_fd);

2137

2529

}

2138

2530

}

2139

2531

2140

2532

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

2141

2533

int pubkey_fd = open(pubkey, O_RDONLY);

2142

2534

if(pubkey_fd == -1){

2154

2546

}

2155

2547

}

2156

2548

}

2157

TEMP_FAILURE_RETRY(close(pubkey_fd));

2158

}

2159

}

2160

2549

close(pubkey_fd);

2550

}

2551

}

2552

2553

if(dh_params_file != NULL

2554

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

2555

int dhparams_fd = open(dh_params_file, O_RDONLY);

2556

if(dhparams_fd == -1){

2557

perror_plus("open");

2558

} else {

2559

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

2560

if(ret == -1){

2561

perror_plus("fstat");

2562

} else {

2563

if(S_ISREG(st.st_mode)

2564

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

2565

ret = fchown(dhparams_fd, uid, gid);

2566

if(ret == -1){

2567

perror_plus("fchown");

2568

}

2569

}

2570

}

2571

close(dhparams_fd);

2572

}

2573

}

2574

2161

2575

/* Lower privileges */

2162

ret_errno = lower_privileges();

2163

if(ret_errno != 0){

2164

errno = ret_errno;

2576

ret = lower_privileges();

2577

if(ret != 0){

2578

errno = ret;

2165

2579

perror_plus("Failed to lower privileges");

2166

2580

}

2167

2581

}

2280

2694

2281

2695

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

2282

2696

if(mc.interfaces == NULL){

2283

struct dirent **direntries;

2697

struct dirent **direntries = NULL;

2284

2698

/* Look for any good interfaces */

2285

2699

ret = scandir(sys_class_net, &direntries, good_interface,

2286

2700

alphasort);

2292

2706

if(ret_errno != 0){

2293

2707

errno = ret_errno;

2294

2708

perror_plus("argz_add");

2709

free(direntries[i]);

2295

2710

continue;

2296

2711

}

2297

2712

if(debug){

2298

2713

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

2299

2714

direntries[i]->d_name);

2300

2715

}

2716

free(direntries[i]);

2301

2717

}

2302

2718

free(direntries);

2303

2719

} else {

2304

free(direntries);

2720

if(ret == 0){

2721

free(direntries);

2722

}

2305

2723

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

2306

2724

exitcode = EXIT_FAILURE;

2307

2725

goto end;

2333

2751

errno = bring_up_interface(interface, delay);

2334

2752

if(not interface_was_up){

2335

2753

if(errno != 0){

2336

perror_plus("Failed to bring up interface");

2754

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

2755

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

2337

2756

} else {

2338

2757

errno = argz_add(&interfaces_to_take_down,

2339

2758

&interfaces_to_take_down_size,

2362

2781

goto end;

2363

2782

}

2364

2783

2365

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

2784

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

2366

2785

if(ret == -1){

2367

2786

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

2368

2787

exitcode = EX_UNAVAILABLE;

2490

2909

2491

2910

/* Allocate a new server */

2492

2911

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2493

&config, NULL, NULL, &ret_errno);

2912

&config, NULL, NULL, &ret);

2494

2913

2495

2914

/* Free the Avahi configuration data */

2496

2915

avahi_server_config_free(&config);

2499

2918

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

2500

2919

if(mc.server == NULL){

2501

2920

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

2502

avahi_strerror(ret_errno));

2921

avahi_strerror(ret));

2503

2922

exitcode = EX_UNAVAILABLE;

2504

2923

goto end;

2505

2924

}

2540

2959

end:

2541

2960

2542

2961

if(debug){

2543

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

2962

if(signal_received){

2963

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

2964

argv[0], signal_received,

2965

strsignal(signal_received));

2966

} else {

2967

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

2968

}

2544

2969

}

2545

2970

2546

2971

/* Cleanup things */

2557

2982

2558

2983

if(gnutls_initialized){

2559

2984

gnutls_certificate_free_credentials(mc.cred);

2560

gnutls_global_deinit();

2561

2985

gnutls_dh_params_deinit(mc.dh_params);

2562

2986

}

2563

2987

2571

2995

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

2572

2996

while(mc.current_server != NULL){

2573

2997

server *next = mc.current_server->next;

2998

#ifdef __GNUC__

2999

#pragma GCC diagnostic push

3000

#pragma GCC diagnostic ignored "-Wcast-qual"

3001

#endif

3002

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

3003

#ifdef __GNUC__

3004

#pragma GCC diagnostic pop

3005

#endif

2574

3006

free(mc.current_server);

2575

3007

mc.current_server = next;

2576

3008

}

2578

3010

2579

3011

/* Re-raise privileges */

2580

3012

{

2581

ret_errno = raise_privileges();

2582

if(ret_errno != 0){

3013

ret = raise_privileges();

3014

if(ret != 0){

3015

errno = ret;

2583

3016

perror_plus("Failed to raise privileges");

2584

3017

} else {

2585

3018

2590

3023

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

2591

3024

{

2592

3025

char *interface = NULL;

2593

while((interface=argz_next(interfaces_to_take_down,

2594

interfaces_to_take_down_size,

2595

interface))){

2596

ret_errno = take_down_interface(interface);

2597

if(ret_errno != 0){

2598

errno = ret_errno;

3026

while((interface = argz_next(interfaces_to_take_down,

3027

interfaces_to_take_down_size,

3028

interface))){

3029

ret = take_down_interface(interface);

3030

if(ret != 0){

3031

errno = ret;

2599

3032

perror_plus("Failed to take down interface");

2600

3033

}

2601

3034

}

2606

3039

}

2607

3040

}

2608

3041

2609

ret_errno = lower_privileges_permanently();

2610

if(ret_errno != 0){

3042

ret = lower_privileges_permanently();

3043

if(ret != 0){

3044

errno = ret;

2611

3045

perror_plus("Failed to lower privileges permanently");

2612

3046

}

2613

3047

}

2615

3049

free(interfaces_to_take_down);

2616

3050

free(interfaces_hooks);

2617

3051

3052

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

3053

uintmax_t level){

3054

struct dirent **direntries = NULL;

3055

int dret;

3056

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

3057

O_RDONLY

3058

| O_NOFOLLOW

3059

| O_DIRECTORY

3060

| O_PATH));

3061

if(dir_fd == -1){

3062

perror_plus("open");

3063

}

3064

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

3065

notdotentries, alphasort);

3066

if(numentries >= 0){

3067

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

3068

if(debug){

3069

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

3070

dirname, direntries[i]->d_name);

3071

}

3072

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

3073

if(dret == -1){

3074

if(errno == EISDIR){

3075

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

3076

AT_REMOVEDIR);

3077

}

3078

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

3079

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

3080

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

3081

/* Recurse only in this special case */

3082

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

3083

dret = 0;

3084

}

3085

if(dret == -1){

3086

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

3087

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

3088

}

3089

}

3090

free(direntries[i]);

3091

}

3092

3093

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

3094

free(direntries);

3095

if(numentries == -1){

3096

perror_plus("scandirat");

3097

}

3098

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3099

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

3100

perror_plus("rmdir");

3101

}

3102

} else {

3103

perror_plus("scandirat");

3104

}

3105

close(dir_fd);

3106

}

3107

2618

3108

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

2619

3109

if(tempdir != NULL){

2620

struct dirent **direntries = NULL;

2621

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

2622

if(tempdir_fd == -1){

2623

perror_plus("open");

2624

} else {

2625

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

2626

alphasort);

2627

if(numentries > 0){

2628

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

2629

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

2630

if(ret == -1){

2631

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

2632

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

2633

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

2634

}

2635

}

2636

2637

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

2638

free(direntries);

2639

if(numentries == -1){

2640

perror_plus("scandir");

2641

}

2642

ret = rmdir(tempdir);

2643

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

2644

perror_plus("rmdir");

2645

}

2646

}

2647

TEMP_FAILURE_RETRY(close(tempdir_fd));

2648

}

3110

clean_dir_at(-1, tempdir, 0);

2649

3111

}

2650

3112

2651

3113

if(quit_now){