/mandos/trunk : revision 237.4.41

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

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

strtof(), abort() */

48

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

49

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

50

asprintf(), strncpy(), strsignal()

51

*/

49

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

50

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

52

51

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

53

52

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

54

53

sockaddr_in6, PF_INET6,

56

55

opendir(), DIR */

57

56

#include <sys/stat.h> /* open(), S_ISREG */

58

57

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

59

inet_pton(), connect(),

60

getnameinfo() */

61

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

58

inet_pton(), connect() */

59

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

62

60

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

63

61

*/

64

62

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

65

63

strtoimax() */

66

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

67

EAI_SYSTEM, ENETUNREACH,

68

EHOSTUNREACH, ECONNREFUSED, EPROTO,

69

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

70

ENOTEMPTY,

64

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

71

65

program_invocation_short_name */

72

66

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

73

67

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

78

72

*/

79

73

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

80

74

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

81

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

82

unlinkat() */

83

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

75

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

76

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

84

77

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

85

78

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

86

79

argp_state, struct argp,

98

91

argz_delete(), argz_append(),

99

92

argz_stringify(), argz_add(),

100

93

argz_count() */

101

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

102

EAI_SYSTEM, gai_strerror() */

103

94

104

95

#ifdef __linux__

105

96

#include <sys/klog.h> /* klogctl() */

147

138

static const char sys_class_net[] = "/sys/class/net";

148

139

char *connect_to = NULL;

149

140

const char *hookdir = HOOKDIR;

150

int hookdir_fd = -1;

151

141

uid_t uid = 65534;

152

142

gid_t gid = 65534;

153

143

190

180

perror(print_text);

191

181

}

192

182

193

__attribute__((format (gnu_printf, 2, 3), nonnull))

183

__attribute__((format (gnu_printf, 2, 3)))

194

184

int fprintf_plus(FILE *stream, const char *format, ...){

195

185

va_list ap;

196

186

va_start (ap, format);

205

195

* bytes. "buffer_capacity" is how much is currently allocated,

206

196

* "buffer_length" is how much is already used.

207

197

*/

208

__attribute__((nonnull, warn_unused_result))

209

198

size_t incbuffer(char **buffer, size_t buffer_length,

210

199

size_t buffer_capacity){

211

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

212

char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

213

if(new_buf == NULL){

214

int old_errno = errno;

215

free(*buffer);

216

errno = old_errno;

217

*buffer = NULL;

201

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

202

if(buffer == NULL){

218

203

return 0;

219

204

}

220

*buffer = new_buf;

221

205

buffer_capacity += BUFFER_SIZE;

222

206

}

223

207

return buffer_capacity;

224

208

}

225

209

226

210

/* Add server to set of servers to retry periodically */

227

__attribute__((nonnull, warn_unused_result))

228

211

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

229

212

int af, server **current_server){

230

213

int ret;

239

222

.af = af };

240

223

if(new_server->ip == NULL){

241

224

perror_plus("strdup");

242

free(new_server);

243

return false;

244

}

245

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

246

if(ret == -1){

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);

257

225

return false;

258

226

}

259

227

/* Special case of first server */

261

229

new_server->next = new_server;

262

230

new_server->prev = new_server;

263

231

*current_server = new_server;

232

/* Place the new server last in the list */

264

233

} else {

265

/* Place the new server last in the list */

266

234

new_server->next = *current_server;

267

235

new_server->prev = (*current_server)->prev;

268

236

new_server->prev->next = new_server;

269

237

(*current_server)->prev = new_server;

270

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

271

244

return true;

272

245

}

273

246

274

247

/*

275

248

* Initialize GPGME.

276

249

*/

277

__attribute__((nonnull, warn_unused_result))

278

static bool init_gpgme(const char * const seckey,

279

const char * const pubkey,

280

const char * const tempdir,

281

mandos_context *mc){

250

static bool init_gpgme(const char *seckey, const char *pubkey,

251

const char *tempdir, mandos_context *mc){

282

252

gpgme_error_t rc;

283

253

gpgme_engine_info_t engine_info;

284

254

285

255

/*

286

256

* Helper function to insert pub and seckey to the engine keyring.

287

257

*/

288

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

289

259

int ret;

290

260

int fd;

291

261

gpgme_data_t pgp_data;

310

280

return false;

311

281

}

312

282

313

ret = close(fd);

283

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

314

284

if(ret == -1){

315

285

perror_plus("close");

316

286

}

372

342

* Decrypt OpenPGP data.

373

343

* Returns -1 on error

374

344

*/

375

__attribute__((nonnull, warn_unused_result))

376

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

377

346

size_t crypto_size,

378

347

char **plaintext,

498

467

return plaintext_length;

499

468

}

500

469

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

508

__attribute__((warn_unused_result))

509

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

510

471

const char *ret = gnutls_strerror(value);

511

return safe_string(ret);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

512

475

}

513

476

514

477

/* GnuTLS log function callback */

515

__attribute__((nonnull))

516

478

static void debuggnutls(__attribute__((unused)) int level,

517

479

const char* string){

518

480

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

519

481

}

520

482

521

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

522

483

static int init_gnutls_global(const char *pubkeyfilename,

523

484

const char *seckeyfilename,

524

const char *dhparamsfilename,

525

485

mandos_context *mc){

526

486

int ret;

527

unsigned int uret;

528

487

529

488

if(debug){

530

489

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

531

490

}

532

491

492

ret = gnutls_global_init();

493

if(ret != GNUTLS_E_SUCCESS){

494

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

495

safer_gnutls_strerror(ret));

496

return -1;

497

}

498

533

499

if(debug){

534

500

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

535

501

* - GnuTLS manual

543

509

if(ret != GNUTLS_E_SUCCESS){

544

510

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

545

511

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

546

513

return -1;

547

514

}

548

515

573

540

safer_gnutls_strerror(ret));

574

541

goto globalfail;

575

542

}

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

}

543

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

544

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

547

goto globalfail;

548

}

549

749

550

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

750

551

751

552

return 0;

753

554

globalfail:

754

555

755

556

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

756

558

gnutls_dh_params_deinit(mc->dh_params);

757

559

return -1;

758

560

}

759

561

760

__attribute__((nonnull, warn_unused_result))

761

562

static int init_gnutls_session(gnutls_session_t *session,

762

563

mandos_context *mc){

763

564

int ret;

810

611

/* ignore client certificate if any. */

811

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

812

613

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

813

616

return 0;

814

617

}

815

618

817

620

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

818

621

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

819

622

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

1038

623

/* Called when a Mandos server is found */

1039

__attribute__((nonnull, warn_unused_result))

1040

624

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

1041

625

AvahiIfIndex if_index,

1042

626

int af, mandos_context *mc){

1043

627

int ret, tcp_sd = -1;

1044

628

ssize_t sret;

1045

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1046

633

char *buffer = NULL;

1047

634

char *decrypted_buffer = NULL;

1048

635

size_t buffer_length = 0;

1051

638

int retval = -1;

1052

639

gnutls_session_t session;

1053

640

int pf; /* Protocol family */

1054

bool route_added = false;

1055

641

1056

642

errno = 0;

1057

643

1079

665

bool match = false;

1080

666

{

1081

667

char *interface = NULL;

1082

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

1083

mc->interfaces_size,

1084

interface))){

668

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

669

interface))){

1085

670

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

1086

671

match = true;

1087

672

break;

1116

701

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

1117

702

}

1118

703

1119

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

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1120

705

if(tcp_sd < 0){

1121

706

int e = errno;

1122

707

perror_plus("socket");

1129

714

goto mandos_end;

1130

715

}

1131

716

717

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

1132

718

if(af == AF_INET6){

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);

719

to.in6.sin6_family = (sa_family_t)af;

720

ret = inet_pton(af, ip, &to.in6.sin6_addr);

1136

721

} else { /* IPv4 */

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);

722

to.in.sin_family = (sa_family_t)af;

723

ret = inet_pton(af, ip, &to.in.sin_addr);

1140

724

}

1141

725

if(ret < 0 ){

1142

726

int e = errno;

1151

735

goto mandos_end;

1152

736

}

1153

737

if(af == AF_INET6){

1154

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

1155

if(IN6_IS_ADDR_LINKLOCAL

1156

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

744

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

1157

748

if(if_index == AVAHI_IF_UNSPEC){

1158

749

fprintf_plus(stderr, "An IPv6 link-local address is"

1159

750

" incomplete without a network interface\n");

1161

752

goto mandos_end;

1162

753

}

1163

754

/* Set the network interface number as scope */

1164

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

755

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

756

}

1166

757

} else {

1167

((struct sockaddr_in *)&to)->sin_port = htons(port);

758

to.in.sin_port = htons(port);

1168

759

}

1169

760

1170

761

if(quit_now){

1187

778

}

1188

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1189

780

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1190

if(af == AF_INET6){

1191

ret = getnameinfo((struct sockaddr *)&to,

1192

sizeof(struct sockaddr_in6),

1193

addrstr, sizeof(addrstr), NULL, 0,

1194

NI_NUMERICHOST);

1195

} else {

1196

ret = getnameinfo((struct sockaddr *)&to,

1197

sizeof(struct sockaddr_in),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

}

1201

if(ret == EAI_SYSTEM){

1202

perror_plus("getnameinfo");

1203

} else if(ret != 0) {

1204

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

1205

} else if(strcmp(addrstr, ip) != 0){

1206

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

1207

}

1208

}

1209

1210

if(quit_now){

1211

errno = EINTR;

1212

goto mandos_end;

1213

}

1214

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;

781

const char *pcret;

782

if(af == AF_INET6){

783

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

784

sizeof(addrstr));

785

} else {

786

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

787

sizeof(addrstr));

788

}

789

if(pcret == NULL){

790

perror_plus("inet_ntop");

791

} else {

792

if(strcmp(addrstr, ip) != 0){

793

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

794

}

795

}

796

}

797

798

if(quit_now){

799

errno = EINTR;

800

goto mandos_end;

801

}

802

803

if(af == AF_INET6){

804

ret = connect(tcp_sd, &to.in6, sizeof(to));

805

} else {

806

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

807

}

808

if(ret < 0){

809

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

810

int e = errno;

811

perror_plus("connect");

812

errno = e;

813

}

814

goto mandos_end;

815

}

816

817

if(quit_now){

818

errno = EINTR;

819

goto mandos_end;

1270

820

}

1271

821

1272

822

const char *out = mandos_protocol_version;

1426

976

&decrypted_buffer, mc);

1427

977

if(decrypted_buffer_size >= 0){

1428

978

1429

clearerr(stdout);

1430

979

written = 0;

1431

980

while(written < (size_t) decrypted_buffer_size){

1432

981

if(quit_now){

1448

997

}

1449

998

written += (size_t)ret;

1450

999

}

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

}

1461

1000

retval = 0;

1462

1001

}

1463

1002

}

1466

1005

1467

1006

mandos_end:

1468

1007

{

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

}

1475

1008

int e = errno;

1476

1009

free(decrypted_buffer);

1477

1010

free(buffer);

1478

1011

if(tcp_sd >= 0){

1479

ret = close(tcp_sd);

1012

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

1480

1013

}

1481

1014

if(ret == -1){

1482

1015

if(e == 0){

1507

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

1508

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1509

1042

flags,

1510

void *mc){

1043

void* mc){

1511

1044

if(r == NULL){

1512

1045

return;

1513

1046

}

1516

1049

timed out */

1517

1050

1518

1051

if(quit_now){

1519

avahi_s_service_resolver_free(r);

1520

1052

return;

1521

1053

}

1522

1054

1567

1099

const char *domain,

1568

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1569

1101

flags,

1570

void *mc){

1102

void* mc){

1571

1103

if(b == NULL){

1572

1104

return;

1573

1105

}

1633

1165

errno = old_errno;

1634

1166

}

1635

1167

1636

__attribute__((nonnull, warn_unused_result))

1637

1168

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

1638

1169

int ret;

1639

int old_errno;

1170

error_t ret_errno;

1640

1171

1641

1172

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

1642

1173

if(s < 0){

1643

old_errno = errno;

1174

ret_errno = errno;

1644

1175

perror_plus("socket");

1645

errno = old_errno;

1176

errno = ret_errno;

1646

1177

return false;

1647

1178

}

1648

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

1649

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

1179

strcpy(ifr->ifr_name, ifname);

1650

1180

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1651

1181

if(ret == -1){

1652

1182

if(debug){

1653

old_errno = errno;

1183

ret_errno = errno;

1654

1184

perror_plus("ioctl SIOCGIFFLAGS");

1655

errno = old_errno;

1185

errno = ret_errno;

1656

1186

}

1657

1187

return false;

1658

1188

}

1659

1189

return true;

1660

1190

}

1661

1191

1662

__attribute__((nonnull, warn_unused_result))

1663

1192

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

1664

1193

1665

1194

/* Reject the loopback device */

1707

1236

* corresponds to an acceptable network device.

1708

1237

* (This function is passed to scandir(3) as a filter function.)

1709

1238

*/

1710

__attribute__((nonnull, warn_unused_result))

1711

1239

int good_interface(const struct dirent *if_entry){

1712

1240

if(if_entry->d_name[0] == '.'){

1713

1241

return 0;

1731

1259

/*

1732

1260

* This function determines if a network interface is up.

1733

1261

*/

1734

__attribute__((nonnull, warn_unused_result))

1735

1262

bool interface_is_up(const char *interface){

1736

1263

struct ifreq ifr;

1737

1264

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

1748

1275

/*

1749

1276

* This function determines if a network interface is running

1750

1277

*/

1751

__attribute__((nonnull, warn_unused_result))

1752

1278

bool interface_is_running(const char *interface){

1753

1279

struct ifreq ifr;

1754

1280

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

1762

1288

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1763

1289

}

1764

1290

1765

__attribute__((nonnull, pure, warn_unused_result))

1766

1291

int notdotentries(const struct dirent *direntry){

1767

1292

/* Skip "." and ".." */

1768

1293

if(direntry->d_name[0] == '.'

1775

1300

}

1776

1301

1777

1302

/* Is this directory entry a runnable program? */

1778

__attribute__((nonnull, warn_unused_result))

1779

1303

int runnable_hook(const struct dirent *direntry){

1780

1304

int ret;

1781

1305

size_t sret;

1789

1313

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1790

1314

"abcdefghijklmnopqrstuvwxyz"

1791

1315

"0123456789"

1792

"_.-");

1316

"_-");

1793

1317

if((direntry->d_name)[sret] != '\0'){

1794

1318

/* Contains non-allowed characters */

1795

1319

if(debug){

1799

1323

return 0;

1800

1324

}

1801

1325

1802

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

1326

char *fullname = NULL;

1327

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

1328

if(ret < 0){

1329

perror_plus("asprintf");

1330

return 0;

1331

}

1332

1333

ret = stat(fullname, &st);

1803

1334

if(ret == -1){

1804

1335

if(debug){

1805

1336

perror_plus("Could not stat hook");

1829

1360

return 1;

1830

1361

}

1831

1362

1832

__attribute__((nonnull, warn_unused_result))

1833

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1834

1364

mandos_context *mc){

1835

1365

int ret;

1839

1369

1840

1370

while(true){

1841

1371

if(mc->current_server == NULL){

1842

if(debug){

1372

if (debug){

1843

1373

fprintf_plus(stderr, "Wait until first server is found."

1844

1374

" No timeout!\n");

1845

1375

}

1846

1376

ret = avahi_simple_poll_iterate(s, -1);

1847

1377

} else {

1848

if(debug){

1378

if (debug){

1849

1379

fprintf_plus(stderr, "Check current_server if we should run"

1850

1380

" it, or wait\n");

1851

1381

}

1868

1398

- ((intmax_t)waited_time.tv_sec * 1000))

1869

1399

- ((intmax_t)waited_time.tv_nsec / 1000000));

1870

1400

1871

if(debug){

1401

if (debug){

1872

1402

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1873

1403

block_time);

1874

1404

}

1896

1426

ret = avahi_simple_poll_iterate(s, (int)block_time);

1897

1427

}

1898

1428

if(ret != 0){

1899

if(ret > 0 or errno != EINTR){

1429

if (ret > 0 or errno != EINTR){

1900

1430

return (ret != 1) ? ret : 0;

1901

1431

}

1902

1432

}

1903

1433

}

1904

1434

}

1905

1435

1906

__attribute__((nonnull))

1907

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

1436

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

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1440

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

1441

ret_errno = errno;

1442

perror_plus("seteuid");

1443

}

1444

errno = old_errno;

1445

return ret_errno;

1446

}

1447

1448

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

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1452

if(ret_errno != 0){

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

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

1457

ret_errno = errno;

1458

perror_plus("seteuid");

1459

}

1460

errno = old_errno;

1461

return ret_errno;

1462

}

1463

1464

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

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1468

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

1469

ret_errno = errno;

1470

perror_plus("seteuid");

1471

}

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

/* Lower privileges permanently */

1477

error_t lower_privileges_permanently(void){

1478

error_t old_errno = errno;

1479

error_t ret_errno = 0;

1480

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

1481

ret_errno = errno;

1482

perror_plus("setuid");

1483

}

1484

errno = old_errno;

1485

return ret_errno;

1486

}

1487

1488

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

1908

1489

const float delay){

1909

struct dirent **direntries = NULL;

1910

if(hookdir_fd == -1){

1911

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1912

| O_CLOEXEC);

1913

if(hookdir_fd == -1){

1914

if(errno == ENOENT){

1915

if(debug){

1916

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1917

" found\n", hookdir);

1918

}

1919

} else {

1920

perror_plus("open");

1921

}

1922

return;

1923

}

1924

}

1925

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

1926

runnable_hook, alphasort);

1490

struct dirent **direntries;

1491

struct dirent *direntry;

1492

int ret;

1493

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

1494

alphasort);

1927

1495

if(numhooks == -1){

1928

perror_plus("scandir");

1929

return;

1930

}

1931

struct dirent *direntry;

1932

int ret;

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

}

1938

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

1939

direntry = direntries[i];

1940

if(debug){

1941

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1942

direntry->d_name);

1496

if(errno == ENOENT){

1497

if(debug){

1498

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1943

1503

}

1944

pid_t hook_pid = fork();

1945

if(hook_pid == 0){

1946

/* Child */

1947

/* Raise privileges */

1948

errno = raise_privileges_permanently();

1949

if(errno != 0){

1950

perror_plus("Failed to raise privileges");

1951

_exit(EX_NOPERM);

1952

}

1953

/* Set group */

1954

errno = 0;

1955

ret = setgid(0);

1956

if(ret == -1){

1957

perror_plus("setgid");

1958

_exit(EX_NOPERM);

1959

}

1960

/* Reset supplementary groups */

1961

errno = 0;

1962

ret = setgroups(0, NULL);

1963

if(ret == -1){

1964

perror_plus("setgroups");

1965

_exit(EX_NOPERM);

1966

}

1967

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

1968

if(ret == -1){

1969

perror_plus("setenv");

1970

_exit(EX_OSERR);

1971

}

1972

ret = setenv("DEVICE", interface, 1);

1973

if(ret == -1){

1974

perror_plus("setenv");

1975

_exit(EX_OSERR);

1976

}

1977

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1978

if(ret == -1){

1979

perror_plus("setenv");

1980

_exit(EX_OSERR);

1981

}

1982

ret = setenv("MODE", mode, 1);

1983

if(ret == -1){

1984

perror_plus("setenv");

1985

_exit(EX_OSERR);

1986

}

1987

char *delaystring;

1988

ret = asprintf(&delaystring, "%f", (double)delay);

1989

if(ret == -1){

1504

} else {

1505

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

1506

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

1507

direntry = direntries[i];

1508

char *fullname = NULL;

1509

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

1510

if(ret < 0){

1990

1511

perror_plus("asprintf");

1991

_exit(EX_OSERR);

1992

}

1993

ret = setenv("DELAY", delaystring, 1);

1994

if(ret == -1){

1512

continue;

1513

}

1514

if(debug){

1515

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1516

direntry->d_name);

1517

}

1518

pid_t hook_pid = fork();

1519

if(hook_pid == 0){

1520

/* Child */

1521

/* Raise privileges */

1522

raise_privileges_permanently();

1523

/* Set group */

1524

errno = 0;

1525

ret = setgid(0);

1526

if(ret == -1){

1527

perror_plus("setgid");

1528

}

1529

/* Reset supplementary groups */

1530

errno = 0;

1531

ret = setgroups(0, NULL);

1532

if(ret == -1){

1533

perror_plus("setgroups");

1534

}

1535

dup2(devnull, STDIN_FILENO);

1536

close(devnull);

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1538

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

1539

if(ret == -1){

1540

perror_plus("setenv");

1541

_exit(EX_OSERR);

1542

}

1543

ret = setenv("DEVICE", interface, 1);

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

ret = setenv("MODE", mode, 1);

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

char *delaystring;

1559

ret = asprintf(&delaystring, "%f", delay);

1560

if(ret == -1){

1561

perror_plus("asprintf");

1562

_exit(EX_OSERR);

1563

}

1564

ret = setenv("DELAY", delaystring, 1);

1565

if(ret == -1){

1566

free(delaystring);

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

1995

1570

free(delaystring);

1996

perror_plus("setenv");

1997

_exit(EX_OSERR);

1998

}

1999

free(delaystring);

2000

if(connect_to != NULL){

2001

ret = setenv("CONNECT", connect_to, 1);

2002

if(ret == -1){

2003

perror_plus("setenv");

2004

_exit(EX_OSERR);

2005

}

2006

}

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){

2035

perror_plus("fexecve");

2036

_exit(EXIT_FAILURE);

2037

}

2038

} else {

2039

if(hook_pid == -1){

2040

perror_plus("fork");

2041

free(direntry);

2042

continue;

2043

}

2044

int status;

2045

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

2046

perror_plus("waitpid");

2047

free(direntry);

2048

continue;

2049

}

2050

if(WIFEXITED(status)){

2051

if(WEXITSTATUS(status) != 0){

2052

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

2053

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

2054

WEXITSTATUS(status));

2055

free(direntry);

2056

continue;

2057

}

2058

} else if(WIFSIGNALED(status)){

2059

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

2060

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

2061

WTERMSIG(status));

2062

free(direntry);

2063

continue;

1571

if(connect_to != NULL){

1572

ret = setenv("CONNECT", connect_to, 1);

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1579

perror_plus("execl");

1580

_exit(EXIT_FAILURE);

1581

}

2064

1582

} else {

2065

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

2066

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

2067

free(direntry);

2068

continue;

2069

}

2070

}

2071

if(debug){

2072

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

2073

direntry->d_name);

2074

}

2075

free(direntry);

2076

}

2077

free(direntries);

2078

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

2079

perror_plus("close");

2080

} else {

2081

hookdir_fd = -1;

2082

}

2083

close(devnull);

1583

int status;

1584

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

1585

perror_plus("waitpid");

1586

free(fullname);

1587

continue;

1588

}

1589

if(WIFEXITED(status)){

1590

if(WEXITSTATUS(status) != 0){

1591

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

1592

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

1593

WEXITSTATUS(status));

1594

free(fullname);

1595

continue;

1596

}

1597

} else if(WIFSIGNALED(status)){

1598

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

1599

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

1600

WTERMSIG(status));

1601

free(fullname);

1602

continue;

1603

} else {

1604

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

1605

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

1606

free(fullname);

1607

continue;

1608

}

1609

}

1610

free(fullname);

1611

if(debug){

1612

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

1613

direntry->d_name);

1614

}

1615

}

1616

close(devnull);

1617

}

1618

return true;

2084

1619

}

2085

1620

2086

__attribute__((nonnull, warn_unused_result))

2087

int bring_up_interface(const char *const interface,

2088

const float delay){

2089

int old_errno = errno;

2090

int ret;

1621

error_t bring_up_interface(const char *const interface,

1622

const float delay){

1623

int sd = -1;

1624

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

2091

1627

struct ifreq network;

2092

1628

unsigned int if_index = if_nametoindex(interface);

2093

1629

if(if_index == 0){

2102

1638

}

2103

1639

2104

1640

if(not interface_is_up(interface)){

2105

int ret_errno = 0;

2106

int ioctl_errno = 0;

2107

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

1641

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

2108

1642

ret_errno = errno;

2109

1643

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

2110

1644

"\"%s\"\n", interface);

2111

errno = old_errno;

2112

1645

return ret_errno;

2113

1646

}

2114

network.ifr_flags |= IFF_UP; /* set flag */

1647

network.ifr_flags |= IFF_UP;

2115

1648

2116

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

2117

if(sd == -1){

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

2118

1651

ret_errno = errno;

2119

1652

perror_plus("socket");

2120

1653

errno = old_errno;

2121

1654

return ret_errno;

2122

1655

}

2123

1656

2124

1657

if(quit_now){

2125

ret = close(sd);

2126

if(ret == -1){

2127

perror_plus("close");

2128

}

1658

close(sd);

2129

1659

errno = old_errno;

2130

1660

return EINTR;

2131

1661

}

2135

1665

interface);

2136

1666

}

2137

1667

2138

/* Raise privileges */

2139

ret_errno = raise_privileges();

2140

if(ret_errno != 0){

2141

errno = ret_errno;

2142

perror_plus("Failed to raise privileges");

2143

}

1668

/* Raise priviliges */

1669

raise_privileges();

2144

1670

2145

1671

#ifdef __linux__

2146

int ret_linux;

2147

bool restore_loglevel = false;

2148

if(ret_errno == 0){

2149

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2150

messages about the network interface to mess up the prompt */

2151

ret_linux = klogctl(8, NULL, 5);

2152

if(ret_linux == -1){

2153

perror_plus("klogctl");

2154

} else {

2155

restore_loglevel = true;

2156

}

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

messages about the network interface to mess up the prompt */

1674

int ret_linux = klogctl(8, NULL, 5);

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

2157

1679

}

2158

1680

#endif /* __linux__ */

2159

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2160

ioctl_errno = errno;

1681

ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1682

ret_errno = errno;

2161

1683

#ifdef __linux__

2162

1684

if(restore_loglevel){

2163

1685

ret_linux = klogctl(7, NULL, 0);

2167

1689

}

2168

1690

#endif /* __linux__ */

2169

1691

2170

/* If raise_privileges() succeeded above */

2171

if(ret_errno == 0){

2172

/* Lower privileges */

2173

ret_errno = lower_privileges();

2174

if(ret_errno != 0){

2175

errno = ret_errno;

2176

perror_plus("Failed to lower privileges");

2177

}

2178

}

1692

/* Lower privileges */

1693

lower_privileges();

2179

1694

2180

1695

/* Close the socket */

2181

ret = close(sd);

1696

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

2182

1697

if(ret == -1){

2183

1698

perror_plus("close");

2184

1699

}

2185

1700

2186

1701

if(ret_setflags == -1){

2187

errno = ioctl_errno;

1702

errno = ret_errno;

2188

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2189

1704

errno = old_errno;

2190

return ioctl_errno;

1705

return ret_errno;

2191

1706

}

2192

1707

} else if(debug){

2193

1708

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

2196

1711

2197

1712

/* Sleep checking until interface is running.

2198

1713

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

2199

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

1714

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

2200

1715

if(interface_is_running(interface)){

2201

1716

break;

2202

1717

}

2211

1726

return 0;

2212

1727

}

2213

1728

2214

__attribute__((nonnull, warn_unused_result))

2215

int take_down_interface(const char *const interface){

2216

int old_errno = errno;

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

2217

1734

struct ifreq network;

2218

1735

unsigned int if_index = if_nametoindex(interface);

2219

1736

if(if_index == 0){

2222

1739

return ENXIO;

2223

1740

}

2224

1741

if(interface_is_up(interface)){

2225

int ret_errno = 0;

2226

int ioctl_errno = 0;

2227

1742

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

2228

1743

ret_errno = errno;

2229

1744

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

2230

1745

"\"%s\"\n", interface);

2231

errno = old_errno;

2232

1746

return ret_errno;

2233

1747

}

2234

1748

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

2235

1749

2236

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

2237

if(sd == -1){

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

2238

1752

ret_errno = errno;

2239

1753

perror_plus("socket");

2240

1754

errno = old_errno;

2246

1760

interface);

2247

1761

}

2248

1762

2249

/* Raise privileges */

2250

ret_errno = raise_privileges();

2251

if(ret_errno != 0){

2252

errno = ret_errno;

2253

perror_plus("Failed to raise privileges");

2254

}

2255

2256

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

2257

ioctl_errno = errno;

2258

2259

/* If raise_privileges() succeeded above */

2260

if(ret_errno == 0){

2261

/* Lower privileges */

2262

ret_errno = lower_privileges();

2263

if(ret_errno != 0){

2264

errno = ret_errno;

2265

perror_plus("Failed to lower privileges");

2266

}

2267

}

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

2268

1771

2269

1772

/* Close the socket */

2270

int ret = close(sd);

1773

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

2271

1774

if(ret == -1){

2272

1775

perror_plus("close");

2273

1776

}

2274

1777

2275

1778

if(ret_setflags == -1){

2276

errno = ioctl_errno;

1779

errno = ret_errno;

2277

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2278

1781

errno = old_errno;

2279

return ioctl_errno;

1782

return ret_errno;

2280

1783

}

2281

1784

} else if(debug){

2282

1785

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

2288

1791

}

2289

1792

2290

1793

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

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 };

1794

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

1795

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

1796

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

1797

.interfaces = NULL, .interfaces_size = 0 };

2296

1798

AvahiSServiceBrowser *sb = NULL;

2297

1799

error_t ret_errno;

2298

1800

int ret;

2301

1803

int exitcode = EXIT_SUCCESS;

2302

1804

char *interfaces_to_take_down = NULL;

2303

1805

size_t interfaces_to_take_down_size = 0;

2304

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

2305

char old_tempdir[] = "/tmp/mandosXXXXXX";

2306

char *tempdir = NULL;

1806

char tempdir[] = "/tmp/mandosXXXXXX";

1807

bool tempdir_created = false;

2307

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2308

1809

const char *seckey = PATHDIR "/" SECKEY;

2309

1810

const char *pubkey = PATHDIR "/" PUBKEY;

2310

const char *dh_params_file = NULL;

2311

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

2312

1813

2313

1814

bool gnutls_initialized = false;

2314

1815

bool gpgme_initialized = false;

2366

1867

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

2367

1868

" Diffie-Hellman key exchange",

2368

1869

.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 },

2374

1870

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

2375

1871

.arg = "STRING",

2376

1872

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

2431

1927

}

2432

1928

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

2433

1929

break;

2434

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

2435

dh_params_file = arg;

2436

break;

2437

1930

case 130: /* --priority */

2438

1931

mc.priority = arg;

2439

1932

break;

2479

1972

.args_doc = "",

2480

1973

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

2481

1974

" passwords from a Mandos server" };

2482

ret_errno = argp_parse(&argp, argc, argv,

2483

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2484

switch(ret_errno){

1975

ret = argp_parse(&argp, argc, argv,

1976

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1977

switch(ret){

2485

1978

case 0:

2486

1979

break;

2487

1980

case ENOMEM:

2488

1981

default:

2489

errno = ret_errno;

1982

errno = ret;

2490

1983

perror_plus("argp_parse");

2491

1984

exitcode = EX_OSERR;

2492

1985

goto end;

2495

1988

goto end;

2496

1989

}

2497

1990

}

2498

1991

2499

1992

{

2500

1993

/* Work around Debian bug #633582:

2501

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

1994

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

2502

1995

2503

/* Re-raise privileges */

2504

ret = raise_privileges();

2505

if(ret != 0){

2506

errno = ret;

2507

perror_plus("Failed to raise privileges");

2508

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2509

1998

struct stat st;

2510

1999

2511

2000

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2525

2014

}

2526

2015

}

2527

2016

}

2528

close(seckey_fd);

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2529

2018

}

2530

2019

}

2531

2020

2532

2021

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

2533

2022

int pubkey_fd = open(pubkey, O_RDONLY);

2534

2023

if(pubkey_fd == -1){

2546

2035

}

2547

2036

}

2548

2037

}

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

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2575

2042

/* Lower privileges */

2576

ret = lower_privileges();

2577

if(ret != 0){

2578

errno = ret;

2579

perror_plus("Failed to lower privileges");

2580

}

2043

lower_privileges();

2581

2044

}

2582

2045

}

2583

2046

2607

2070

goto end;

2608

2071

}

2609

2072

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2610

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2611

}

2612

run_network_hooks("start", interfaces_hooks != NULL ?

2613

interfaces_hooks : "", delay);

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2614

2081

}

2615

2082

2616

2083

if(not debug){

2694

2161

2695

2162

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

2696

2163

if(mc.interfaces == NULL){

2697

struct dirent **direntries = NULL;

2164

struct dirent **direntries;

2698

2165

/* Look for any good interfaces */

2699

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2700

2167

alphasort);

2704

2171

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2705

2172

direntries[i]->d_name);

2706

2173

if(ret_errno != 0){

2707

errno = ret_errno;

2708

2174

perror_plus("argz_add");

2709

free(direntries[i]);

2710

2175

continue;

2711

2176

}

2712

2177

if(debug){

2713

2178

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

2714

2179

direntries[i]->d_name);

2715

2180

}

2716

free(direntries[i]);

2717

2181

}

2718

2182

free(direntries);

2719

2183

} else {

2720

if(ret == 0){

2721

free(direntries);

2722

}

2184

free(direntries);

2723

2185

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

2724

2186

exitcode = EXIT_FAILURE;

2725

2187

goto end;

2748

2210

break;

2749

2211

}

2750

2212

bool interface_was_up = interface_is_up(interface);

2751

errno = bring_up_interface(interface, delay);

2213

ret = bring_up_interface(interface, delay);

2752

2214

if(not interface_was_up){

2753

if(errno != 0){

2754

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

2755

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

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2756

2218

} else {

2757

errno = argz_add(&interfaces_to_take_down,

2758

&interfaces_to_take_down_size,

2759

interface);

2760

if(errno != 0){

2761

perror_plus("argz_add");

2762

}

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2763

2222

}

2764

2223

}

2765

2224

}

2781

2240

goto end;

2782

2241

}

2783

2242

2784

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

2243

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

2785

2244

if(ret == -1){

2786

2245

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

2787

2246

exitcode = EX_UNAVAILABLE;

2794

2253

goto end;

2795

2254

}

2796

2255

2797

/* Try /run/tmp before /tmp */

2798

tempdir = mkdtemp(run_tempdir);

2799

if(tempdir == NULL and errno == ENOENT){

2800

if(debug){

2801

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2802

run_tempdir, old_tempdir);

2803

}

2804

tempdir = mkdtemp(old_tempdir);

2805

}

2806

if(tempdir == NULL){

2256

if(mkdtemp(tempdir) == NULL){

2807

2257

perror_plus("mkdtemp");

2808

2258

goto end;

2809

2259

}

2260

tempdir_created = true;

2810

2261

2811

2262

if(quit_now){

2812

2263

goto end;

2887

2338

sleep((unsigned int)retry_interval);

2888

2339

}

2889

2340

2890

if(not quit_now){

2341

if (not quit_now){

2891

2342

exitcode = EXIT_SUCCESS;

2892

2343

}

2893

2344

2909

2360

2910

2361

/* Allocate a new server */

2911

2362

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2912

&config, NULL, NULL, &ret);

2363

&config, NULL, NULL, &ret_errno);

2913

2364

2914

2365

/* Free the Avahi configuration data */

2915

2366

avahi_server_config_free(&config);

2918

2369

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

2919

2370

if(mc.server == NULL){

2920

2371

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

2921

avahi_strerror(ret));

2372

avahi_strerror(ret_errno));

2922

2373

exitcode = EX_UNAVAILABLE;

2923

2374

goto end;

2924

2375

}

2948

2399

if(debug){

2949

2400

fprintf_plus(stderr, "Starting Avahi loop search\n");

2950

2401

}

2951

2402

2952

2403

ret = avahi_loop_with_timeout(simple_poll,

2953

2404

(int)(retry_interval * 1000), &mc);

2954

2405

if(debug){

2959

2410

end:

2960

2411

2961

2412

if(debug){

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

}

2413

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

2969

2414

}

2970

2415

2971

2416

/* Cleanup things */

2982

2427

2983

2428

if(gnutls_initialized){

2984

2429

gnutls_certificate_free_credentials(mc.cred);

2430

gnutls_global_deinit();

2985

2431

gnutls_dh_params_deinit(mc.dh_params);

2986

2432

}

2987

2433

2995

2441

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

2996

2442

while(mc.current_server != NULL){

2997

2443

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

3006

2444

free(mc.current_server);

3007

2445

mc.current_server = next;

3008

2446

}

3009

2447

}

3010

2448

3011

/* Re-raise privileges */

2449

/* Re-raise priviliges */

3012

2450

{

3013

ret = raise_privileges();

3014

if(ret != 0){

3015

errno = ret;

3016

perror_plus("Failed to raise privileges");

3017

} else {

3018

3019

/* Run network hooks */

3020

run_network_hooks("stop", interfaces_hooks != NULL ?

3021

interfaces_hooks : "", delay);

3022

3023

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

3024

{

3025

char *interface = NULL;

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;

3032

perror_plus("Failed to take down interface");

3033

}

3034

}

3035

if(debug and (interfaces_to_take_down == NULL)){

3036

fprintf_plus(stderr, "No interfaces needed to be taken"

3037

" down\n");

3038

}

3039

}

3040

}

3041

3042

ret = lower_privileges_permanently();

3043

if(ret != 0){

3044

errno = ret;

3045

perror_plus("Failed to lower privileges permanently");

3046

}

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2467

}

2468

}

2469

if(debug and (interfaces_to_take_down == NULL)){

2470

fprintf_plus(stderr, "No interfaces needed to be taken"

2471

" down\n");

2472

}

2473

}

2474

2475

lower_privileges_permanently();

3047

2476

}

3048

2477

3049

2478

free(interfaces_to_take_down);

3050

2479

free(interfaces_hooks);

3051

2480

3052

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

3053

uintmax_t level){

2481

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

2482

if(tempdir_created){

3054

2483

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){

2484

struct dirent *direntry = NULL;

2485

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

2486

alphasort);

2487

if (numentries > 0){

3067

2488

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

3108

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

3109

if(tempdir != NULL){

3110

clean_dir_at(-1, tempdir, 0);

2489

direntry = direntries[i];

2490

char *fullname = NULL;

2491

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

2492

direntry->d_name);

2493

if(ret < 0){

2494

perror_plus("asprintf");

2495

continue;

2496

}

2497

ret = remove(fullname);

2498

if(ret == -1){

2499

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

2500

strerror(errno));

2501

}

2502

free(fullname);

2503

}

2504

}

2505

2506

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

2507

free(direntries);

2508

if (numentries == -1){

2509

perror_plus("scandir");

2510

}

2511

ret = rmdir(tempdir);

2512

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

2513

perror_plus("rmdir");

2514

}

3111

2515

}

3112

2516

3113

2517

if(quit_now){