/mandos/trunk : revision 943

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

10

*

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* Everything else is

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*

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* This program is free software: you can redistribute it and/or

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* modify it under the terms of the GNU General Public License as

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* published by the Free Software Foundation, either version 3 of the

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* License, or (at your option) any later version.

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*

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* This program is distributed in the hope that it will be useful, but

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13

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*

15

* This file is part of Mandos.

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*

17

* Mandos is free software: you can redistribute it and/or modify it

18

* under the terms of the GNU General Public License as published by

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* the Free Software Foundation, either version 3 of the License, or

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* (at your option) any later version.

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*

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* Mandos is distributed in the hope that it will be useful, but

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23

* WITHOUT ANY WARRANTY; without even the implied warranty of

22

24

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

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25

* General Public License for more details.

24

26

*

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27

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

26

* along with this program. If not, see

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

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

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29

*

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30

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

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31

*/

32

33

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

33

34

#ifndef _LARGEFILE_SOURCE

34

35

#define _LARGEFILE_SOURCE

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#endif

36

#endif /* not _LARGEFILE_SOURCE */

36

37

#ifndef _FILE_OFFSET_BITS

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38

#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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40

41

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

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42

43

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

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stdout, ferror(), remove() */

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stdout, ferror() */

44

45

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

45

46

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

46

47

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

47

48

strtof(), abort() */

48

49

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

49

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

50

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

50

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

51

asprintf(), strncpy(), strsignal()

52

*/

51

53

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

52

54

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

53

55

sockaddr_in6, PF_INET6,

55

57

opendir(), DIR */

56

58

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

57

59

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

58

inet_pton(), connect() */

59

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

60

inet_pton(), connect(),

61

getnameinfo() */

62

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

60

63

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

61

64

*/

62

65

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

63

66

strtoimax() */

64

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

67

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

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

65

72

program_invocation_short_name */

66

73

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

67

74

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

72

79

*/

73

80

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

74

81

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

75

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

76

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

82

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

83

unlinkat() */

84

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

77

85

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

78

86

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

79

87

argp_state, struct argp,

91

99

argz_delete(), argz_append(),

92

100

argz_stringify(), argz_add(),

93

101

argz_count() */

102

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

103

EAI_SYSTEM, gai_strerror() */

94

104

95

105

#ifdef __linux__

96

106

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

138

148

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

139

149

char *connect_to = NULL;

140

150

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

141

152

uid_t uid = 65534;

142

153

gid_t gid = 65534;

143

154

180

191

perror(print_text);

181

192

}

182

193

183

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

194

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

184

195

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

185

196

va_list ap;

186

197

va_start (ap, format);

195

206

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

196

207

* "buffer_length" is how much is already used.

197

208

*/

209

__attribute__((nonnull, warn_unused_result))

198

210

size_t incbuffer(char **buffer, size_t buffer_length,

199

211

size_t buffer_capacity){

200

212

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

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

202

if(buffer == NULL){

213

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

214

if(new_buf == NULL){

215

int old_errno = errno;

216

free(*buffer);

217

errno = old_errno;

218

*buffer = NULL;

203

219

return 0;

204

220

}

221

*buffer = new_buf;

205

222

buffer_capacity += BUFFER_SIZE;

206

223

}

207

224

return buffer_capacity;

208

225

}

209

226

210

227

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

228

__attribute__((nonnull, warn_unused_result))

211

229

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

212

230

int af, server **current_server){

213

231

int ret;

222

240

.af = af };

223

241

if(new_server->ip == NULL){

224

242

perror_plus("strdup");

243

free(new_server);

244

return false;

245

}

246

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

247

if(ret == -1){

248

perror_plus("clock_gettime");

249

#ifdef __GNUC__

250

#pragma GCC diagnostic push

251

#pragma GCC diagnostic ignored "-Wcast-qual"

252

#endif

253

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

254

#ifdef __GNUC__

255

#pragma GCC diagnostic pop

256

#endif

257

free(new_server);

225

258

return false;

226

259

}

227

260

/* Special case of first server */

229

262

new_server->next = new_server;

230

263

new_server->prev = new_server;

231

264

*current_server = new_server;

232

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

233

265

} else {

266

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

234

267

new_server->next = *current_server;

235

268

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

236

269

new_server->prev->next = new_server;

237

270

(*current_server)->prev = new_server;

238

271

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

272

return true;

245

273

}

246

274

247

275

/*

248

276

* Initialize GPGME.

249

277

*/

250

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

251

const char *tempdir, mandos_context *mc){

278

__attribute__((nonnull, warn_unused_result))

279

static bool init_gpgme(const char * const seckey,

280

const char * const pubkey,

281

const char * const tempdir,

282

mandos_context *mc){

252

283

gpgme_error_t rc;

253

284

gpgme_engine_info_t engine_info;

254

285

255

286

/*

256

287

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

257

288

*/

258

bool import_key(const char *filename){

289

bool import_key(const char * const filename){

259

290

int ret;

260

291

int fd;

261

292

gpgme_data_t pgp_data;

280

311

return false;

281

312

}

282

313

283

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

314

ret = close(fd);

284

315

if(ret == -1){

285

316

perror_plus("close");

286

317

}

342

373

* Decrypt OpenPGP data.

343

374

* Returns -1 on error

344

375

*/

376

__attribute__((nonnull, warn_unused_result))

345

377

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

378

size_t crypto_size,

347

379

char **plaintext,

467

499

return plaintext_length;

468

500

}

469

501

470

static const char * safer_gnutls_strerror(int value){

502

__attribute__((warn_unused_result, const))

503

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

504

if(str == NULL)

505

return "(unknown)";

506

return str;

507

}

508

509

__attribute__((warn_unused_result))

510

static const char *safer_gnutls_strerror(int value){

471

511

const char *ret = gnutls_strerror(value);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

512

return safe_string(ret);

475

513

}

476

514

477

515

/* GnuTLS log function callback */

516

__attribute__((nonnull))

478

517

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

479

518

const char* string){

480

519

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

481

520

}

482

521

522

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

483

523

static int init_gnutls_global(const char *pubkeyfilename,

484

524

const char *seckeyfilename,

525

const char *dhparamsfilename,

485

526

mandos_context *mc){

486

527

int ret;

528

unsigned int uret;

487

529

488

530

if(debug){

489

531

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

490

532

}

491

533

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

499

534

if(debug){

500

535

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

501

536

* - GnuTLS manual

509

544

if(ret != GNUTLS_E_SUCCESS){

510

545

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

511

546

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

513

547

return -1;

514

548

}

515

549

540

574

safer_gnutls_strerror(ret));

541

575

goto globalfail;

542

576

}

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

577

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

578

if(dhparamsfilename != NULL){

579

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

580

do {

581

int dhpfile = open(dhparamsfilename, O_RDONLY);

582

if(dhpfile == -1){

583

perror_plus("open");

584

dhparamsfilename = NULL;

585

break;

586

}

587

size_t params_capacity = 0;

588

while(true){

589

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

590

(size_t)params.size,

591

(size_t)params_capacity);

592

if(params_capacity == 0){

593

perror_plus("incbuffer");

594

free(params.data);

595

params.data = NULL;

596

dhparamsfilename = NULL;

597

break;

598

}

599

ssize_t bytes_read = read(dhpfile,

600

params.data + params.size,

601

BUFFER_SIZE);

602

/* EOF */

603

if(bytes_read == 0){

604

break;

605

}

606

/* check bytes_read for failure */

607

if(bytes_read < 0){

608

perror_plus("read");

609

free(params.data);

610

params.data = NULL;

611

dhparamsfilename = NULL;

612

break;

613

}

614

params.size += (unsigned int)bytes_read;

615

}

616

ret = close(dhpfile);

617

if(ret == -1){

618

perror_plus("close");

619

}

620

if(params.data == NULL){

621

dhparamsfilename = NULL;

622

}

623

if(dhparamsfilename == NULL){

624

break;

625

}

626

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

627

GNUTLS_X509_FMT_PEM);

628

if(ret != GNUTLS_E_SUCCESS){

629

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

630

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

631

safer_gnutls_strerror(ret));

632

dhparamsfilename = NULL;

633

}

634

free(params.data);

635

} while(false);

636

}

637

if(dhparamsfilename == NULL){

638

if(mc->dh_bits == 0){

639

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

640

/* Try to read the private key file */

641

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

642

do {

643

int secfile = open(seckeyfilename, O_RDONLY);

644

if(secfile == -1){

645

perror_plus("open");

646

break;

647

}

648

size_t buffer_capacity = 0;

649

while(true){

650

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

651

(size_t)buffer.size,

652

(size_t)buffer_capacity);

653

if(buffer_capacity == 0){

654

perror_plus("incbuffer");

655

free(buffer.data);

656

buffer.data = NULL;

657

break;

658

}

659

ssize_t bytes_read = read(secfile,

660

buffer.data + buffer.size,

661

BUFFER_SIZE);

662

/* EOF */

663

if(bytes_read == 0){

664

break;

665

}

666

/* check bytes_read for failure */

667

if(bytes_read < 0){

668

perror_plus("read");

669

free(buffer.data);

670

buffer.data = NULL;

671

break;

672

}

673

buffer.size += (unsigned int)bytes_read;

674

}

675

close(secfile);

676

} while(false);

677

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

678

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

679

if(buffer.data != NULL){

680

{

681

gnutls_openpgp_privkey_t privkey = NULL;

682

ret = gnutls_openpgp_privkey_init(&privkey);

683

if(ret != GNUTLS_E_SUCCESS){

684

fprintf_plus(stderr, "Error initializing OpenPGP key"

685

" structure: %s",

686

safer_gnutls_strerror(ret));

687

free(buffer.data);

688

buffer.data = NULL;

689

} else {

690

ret = gnutls_openpgp_privkey_import

691

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

692

if(ret != GNUTLS_E_SUCCESS){

693

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

694

safer_gnutls_strerror(ret));

695

privkey = NULL;

696

}

697

free(buffer.data);

698

buffer.data = NULL;

699

if(privkey != NULL){

700

/* Use private key to suggest an appropriate

701

sec_param */

702

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

703

gnutls_openpgp_privkey_deinit(privkey);

704

if(debug){

705

fprintf_plus(stderr, "This OpenPGP key implies using"

706

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

707

safe_string(gnutls_sec_param_get_name

708

(sec_param)));

709

}

710

}

711

}

712

}

713

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

714

/* Err on the side of caution */

715

sec_param = GNUTLS_SEC_PARAM_ULTRA;

716

if(debug){

717

fprintf_plus(stderr, "Falling back to security parameter"

718

" \"%s\"\n",

719

safe_string(gnutls_sec_param_get_name

720

(sec_param)));

721

}

722

}

723

}

724

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

725

if(uret != 0){

726

mc->dh_bits = uret;

727

if(debug){

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

mc->dh_bits);

733

}

734

} else {

735

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

736

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

737

safe_string(gnutls_sec_param_get_name

738

(sec_param)),

739

safer_gnutls_strerror(ret));

740

goto globalfail;

741

}

742

} else if(debug){

743

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

744

mc->dh_bits);

745

}

746

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

747

if(ret != GNUTLS_E_SUCCESS){

748

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

749

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

750

safer_gnutls_strerror(ret));

751

goto globalfail;

752

}

753

}

550

754

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

551

755

552

756

return 0;

554

758

globalfail:

555

759

556

760

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

558

761

gnutls_dh_params_deinit(mc->dh_params);

559

762

return -1;

560

763

}

561

764

765

__attribute__((nonnull, warn_unused_result))

562

766

static int init_gnutls_session(gnutls_session_t *session,

563

767

mandos_context *mc){

564

768

int ret;

611

815

/* ignore client certificate if any. */

612

816

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

817

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

616

818

return 0;

617

819

}

618

820

620

822

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

621

823

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

622

824

825

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

826

__attribute__((warn_unused_result))

827

int raise_privileges(void){

828

int old_errno = errno;

829

int ret = 0;

830

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

831

ret = errno;

832

}

833

errno = old_errno;

834

return ret;

835

}

836

837

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

838

__attribute__((warn_unused_result))

839

int raise_privileges_permanently(void){

840

int old_errno = errno;

841

int ret = raise_privileges();

842

if(ret != 0){

843

errno = old_errno;

844

return ret;

845

}

846

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

847

ret = errno;

848

}

849

errno = old_errno;

850

return ret;

851

}

852

853

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

854

__attribute__((warn_unused_result))

855

int lower_privileges(void){

856

int old_errno = errno;

857

int ret = 0;

858

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

859

ret = errno;

860

}

861

errno = old_errno;

862

return ret;

863

}

864

865

/* Lower privileges permanently */

866

__attribute__((warn_unused_result))

867

int lower_privileges_permanently(void){

868

int old_errno = errno;

869

int ret = 0;

870

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

871

ret = errno;

872

}

873

errno = old_errno;

874

return ret;

875

}

876

877

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

878

__attribute__((nonnull, warn_unused_result))

879

static bool add_delete_local_route(const bool add,

880

const char *address,

881

AvahiIfIndex if_index){

882

int ret;

883

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

884

char add_arg[] = "add";

885

char delete_arg[] = "delete";

886

char debug_flag[] = "--debug";

887

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

888

if(pluginhelperdir == NULL){

889

if(debug){

890

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

891

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

892

}

893

return false;

894

}

895

896

char interface[IF_NAMESIZE];

897

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

898

perror_plus("if_indextoname");

899

return false;

900

}

901

902

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

903

if(devnull == -1){

904

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

905

return false;

906

}

907

pid_t pid = fork();

908

if(pid == 0){

909

/* Child */

910

/* Raise privileges */

911

errno = raise_privileges_permanently();

912

if(errno != 0){

913

perror_plus("Failed to raise privileges");

914

/* _exit(EX_NOPERM); */

915

} else {

916

/* Set group */

917

errno = 0;

918

ret = setgid(0);

919

if(ret == -1){

920

perror_plus("setgid");

921

_exit(EX_NOPERM);

922

}

923

/* Reset supplementary groups */

924

errno = 0;

925

ret = setgroups(0, NULL);

926

if(ret == -1){

927

perror_plus("setgroups");

928

_exit(EX_NOPERM);

929

}

930

}

931

ret = dup2(devnull, STDIN_FILENO);

932

if(ret == -1){

933

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

934

_exit(EX_OSERR);

935

}

936

ret = close(devnull);

937

if(ret == -1){

938

perror_plus("close");

939

_exit(EX_OSERR);

940

}

941

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

942

if(ret == -1){

943

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

944

_exit(EX_OSERR);

945

}

946

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

947

O_RDONLY

948

| O_DIRECTORY

949

| O_PATH

950

| O_CLOEXEC));

951

if(helperdir_fd == -1){

952

perror_plus("open");

953

_exit(EX_UNAVAILABLE);

954

}

955

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

956

helper, O_RDONLY));

957

if(helper_fd == -1){

958

perror_plus("openat");

959

close(helperdir_fd);

960

_exit(EX_UNAVAILABLE);

961

}

962

close(helperdir_fd);

963

#ifdef __GNUC__

964

#pragma GCC diagnostic push

965

#pragma GCC diagnostic ignored "-Wcast-qual"

966

#endif

967

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

968

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

969

interface, debug ? debug_flag : NULL, NULL },

970

environ) == -1){

971

#ifdef __GNUC__

972

#pragma GCC diagnostic pop

973

#endif

974

perror_plus("fexecve");

975

_exit(EXIT_FAILURE);

976

}

977

}

978

if(pid == -1){

979

perror_plus("fork");

980

return false;

981

}

982

int status;

983

pid_t pret = -1;

984

errno = 0;

985

do {

986

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

987

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

988

int errno_raising = 0;

989

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

990

errno_raising = errno;

991

perror_plus("Failed to raise privileges in order to"

992

" kill helper program");

993

}

994

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

995

perror_plus("kill");

996

}

997

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

998

perror_plus("Failed to lower privileges after killing"

999

" helper program");

1000

}

1001

return false;

1002

}

1003

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

1004

if(pret == -1){

1005

perror_plus("waitpid");

1006

return false;

1007

}

1008

if(WIFEXITED(status)){

1009

if(WEXITSTATUS(status) != 0){

1010

fprintf_plus(stderr, "Error: iprouteadddel exited"

1011

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

1012

return false;

1013

}

1014

return true;

1015

}

1016

if(WIFSIGNALED(status)){

1017

fprintf_plus(stderr, "Error: iprouteadddel died by"

1018

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

1019

return false;

1020

}

1021

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

1022

return false;

1023

}

1024

1025

__attribute__((nonnull, warn_unused_result))

1026

static bool add_local_route(const char *address,

1027

AvahiIfIndex if_index){

1028

if(debug){

1029

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

1030

}

1031

return add_delete_local_route(true, address, if_index);

1032

}

1033

1034

__attribute__((nonnull, warn_unused_result))

1035

static bool delete_local_route(const char *address,

1036

AvahiIfIndex if_index){

1037

if(debug){

1038

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

1039

}

1040

return add_delete_local_route(false, address, if_index);

1041

}

1042

623

1043

/* Called when a Mandos server is found */

1044

__attribute__((nonnull, warn_unused_result))

624

1045

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

625

1046

AvahiIfIndex if_index,

626

1047

int af, mandos_context *mc){

627

1048

int ret, tcp_sd = -1;

628

1049

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1050

struct sockaddr_storage to;

633

1051

char *buffer = NULL;

634

1052

char *decrypted_buffer = NULL;

635

1053

size_t buffer_length = 0;

638

1056

int retval = -1;

639

1057

gnutls_session_t session;

640

1058

int pf; /* Protocol family */

1059

bool route_added = false;

641

1060

642

1061

errno = 0;

643

1062

665

1084

bool match = false;

666

1085

{

667

1086

char *interface = NULL;

668

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

669

interface))){

1087

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

1088

mc->interfaces_size,

1089

interface))){

670

1090

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

671

1091

match = true;

672

1092

break;

701

1121

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

702

1122

}

703

1123

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1124

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

705

1125

if(tcp_sd < 0){

706

1126

int e = errno;

707

1127

perror_plus("socket");

714

1134

goto mandos_end;

715

1135

}

716

1136

717

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

718

1137

if(af == AF_INET6){

719

to.in6.sin6_family = (sa_family_t)af;

720

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

1138

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

1139

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

1140

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

721

1141

} else { /* IPv4 */

722

to.in.sin_family = (sa_family_t)af;

723

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

1142

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

1143

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

1144

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

724

1145

}

725

1146

if(ret < 0 ){

726

1147

int e = errno;

735

1156

goto mandos_end;

736

1157

}

737

1158

if(af == AF_INET6){

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

1159

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

1160

if(IN6_IS_ADDR_LINKLOCAL

1161

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

748

1162

if(if_index == AVAHI_IF_UNSPEC){

749

1163

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

750

1164

" incomplete without a network interface\n");

752

1166

goto mandos_end;

753

1167

}

754

1168

/* Set the network interface number as scope */

755

to.in6.sin6_scope_id = (uint32_t)if_index;

1169

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

756

1170

}

757

1171

} else {

758

to.in.sin_port = htons(port);

1172

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

759

1173

}

760

1174

761

1175

if(quit_now){

778

1192

}

779

1193

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

780

1194

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

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;

1195

if(af == AF_INET6){

1196

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

1197

sizeof(struct sockaddr_in6),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

} else {

1201

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

1202

sizeof(struct sockaddr_in),

1203

addrstr, sizeof(addrstr), NULL, 0,

1204

NI_NUMERICHOST);

1205

}

1206

if(ret == EAI_SYSTEM){

1207

perror_plus("getnameinfo");

1208

} else if(ret != 0) {

1209

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

1210

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

1211

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

1212

}

1213

}

1214

1215

if(quit_now){

1216

errno = EINTR;

1217

goto mandos_end;

1218

}

1219

1220

while(true){

1221

if(af == AF_INET6){

1222

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

1223

sizeof(struct sockaddr_in6));

1224

} else {

1225

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

1226

sizeof(struct sockaddr_in));

1227

}

1228

if(ret < 0){

1229

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

1230

and if_index != AVAHI_IF_UNSPEC

1231

and connect_to == NULL

1232

and not route_added and

1233

((af == AF_INET6 and not

1234

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1235

&to)->sin6_addr)))

1236

or (af == AF_INET and

1237

/* Not a a IPv4LL address */

1238

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

1239

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

1240

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

1241

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

1242

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

1243

connect to a Mandos server announced by Avahi on a server

1244

host with a global address. Work around this by retrying

1245

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

1246

1247

Avahi bug reference:

1248

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

1249

https://bugs.debian.org/587961

1250

*/

1251

if(debug){

1252

fprintf_plus(stderr, "Mandos server unreachable, trying"

1253

" direct route\n");

1254

}

1255

int e = errno;

1256

route_added = add_local_route(ip, if_index);

1257

if(route_added){

1258

continue;

1259

}

1260

errno = e;

1261

}

1262

if(errno != ECONNREFUSED or debug){

1263

int e = errno;

1264

perror_plus("connect");

1265

errno = e;

1266

}

1267

goto mandos_end;

1268

}

1269

1270

if(quit_now){

1271

errno = EINTR;

1272

goto mandos_end;

1273

}

1274

break;

820

1275

}

821

1276

822

1277

const char *out = mandos_protocol_version;

976

1431

&decrypted_buffer, mc);

977

1432

if(decrypted_buffer_size >= 0){

978

1433

1434

clearerr(stdout);

979

1435

written = 0;

980

1436

while(written < (size_t) decrypted_buffer_size){

981

1437

if(quit_now){

997

1453

}

998

1454

written += (size_t)ret;

999

1455

}

1456

ret = fflush(stdout);

1457

if(ret != 0){

1458

int e = errno;

1459

if(debug){

1460

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

1461

strerror(errno));

1462

}

1463

errno = e;

1464

goto mandos_end;

1465

}

1000

1466

retval = 0;

1001

1467

}

1002

1468

}

1005

1471

1006

1472

mandos_end:

1007

1473

{

1474

if(route_added){

1475

if(not delete_local_route(ip, if_index)){

1476

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

1477

" interface %d", ip, if_index);

1478

}

1479

}

1008

1480

int e = errno;

1009

1481

free(decrypted_buffer);

1010

1482

free(buffer);

1011

1483

if(tcp_sd >= 0){

1012

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

1484

ret = close(tcp_sd);

1013

1485

}

1014

1486

if(ret == -1){

1015

1487

if(e == 0){

1040

1512

AVAHI_GCC_UNUSED AvahiStringList *txt,

1041

1513

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1042

1514

flags,

1043

void* mc){

1515

void *mc){

1044

1516

if(r == NULL){

1045

1517

return;

1046

1518

}

1049

1521

timed out */

1050

1522

1051

1523

if(quit_now){

1524

avahi_s_service_resolver_free(r);

1052

1525

return;

1053

1526

}

1054

1527

1099

1572

const char *domain,

1100

1573

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1101

1574

flags,

1102

void* mc){

1575

void *mc){

1103

1576

if(b == NULL){

1104

1577

return;

1105

1578

}

1165

1638

errno = old_errno;

1166

1639

}

1167

1640

1641

__attribute__((nonnull, warn_unused_result))

1168

1642

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

1169

1643

int ret;

1170

error_t ret_errno;

1644

int old_errno;

1171

1645

1172

1646

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

1173

1647

if(s < 0){

1174

ret_errno = errno;

1648

old_errno = errno;

1175

1649

perror_plus("socket");

1176

errno = ret_errno;

1650

errno = old_errno;

1177

1651

return false;

1178

1652

}

1179

strcpy(ifr->ifr_name, ifname);

1653

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

1654

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

1180

1655

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1181

1656

if(ret == -1){

1182

1657

if(debug){

1183

ret_errno = errno;

1658

old_errno = errno;

1184

1659

perror_plus("ioctl SIOCGIFFLAGS");

1185

errno = ret_errno;

1660

errno = old_errno;

1661

}

1662

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

1663

old_errno = errno;

1664

perror_plus("close");

1665

errno = old_errno;

1186

1666

}

1187

1667

return false;

1188

1668

}

1669

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

1670

old_errno = errno;

1671

perror_plus("close");

1672

errno = old_errno;

1673

}

1189

1674

return true;

1190

1675

}

1191

1676

1677

__attribute__((nonnull, warn_unused_result))

1192

1678

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

1193

1679

1194

1680

/* Reject the loopback device */

1236

1722

* corresponds to an acceptable network device.

1237

1723

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

1238

1724

*/

1725

__attribute__((nonnull, warn_unused_result))

1239

1726

int good_interface(const struct dirent *if_entry){

1240

1727

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

1241

1728

return 0;

1259

1746

/*

1260

1747

* This function determines if a network interface is up.

1261

1748

*/

1749

__attribute__((nonnull, warn_unused_result))

1262

1750

bool interface_is_up(const char *interface){

1263

1751

struct ifreq ifr;

1264

1752

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

1275

1763

/*

1276

1764

* This function determines if a network interface is running

1277

1765

*/

1766

__attribute__((nonnull, warn_unused_result))

1278

1767

bool interface_is_running(const char *interface){

1279

1768

struct ifreq ifr;

1280

1769

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

1288

1777

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

1289

1778

}

1290

1779

1780

__attribute__((nonnull, pure, warn_unused_result))

1291

1781

int notdotentries(const struct dirent *direntry){

1292

1782

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

1293

1783

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

1300

1790

}

1301

1791

1302

1792

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

1793

__attribute__((nonnull, warn_unused_result))

1303

1794

int runnable_hook(const struct dirent *direntry){

1304

1795

int ret;

1305

1796

size_t sret;

1313

1804

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

1314

1805

"abcdefghijklmnopqrstuvwxyz"

1315

1806

"0123456789"

1316

"_-");

1807

"_.-");

1317

1808

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

1318

1809

/* Contains non-allowed characters */

1319

1810

if(debug){

1323

1814

return 0;

1324

1815

}

1325

1816

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);

1817

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

1334

1818

if(ret == -1){

1335

1819

if(debug){

1336

1820

perror_plus("Could not stat hook");

1360

1844

return 1;

1361

1845

}

1362

1846

1847

__attribute__((nonnull, warn_unused_result))

1363

1848

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

1849

mandos_context *mc){

1365

1850

int ret;

1369

1854

1370

1855

while(true){

1371

1856

if(mc->current_server == NULL){

1372

if (debug){

1857

if(debug){

1373

1858

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

1374

1859

" No timeout!\n");

1375

1860

}

1376

1861

ret = avahi_simple_poll_iterate(s, -1);

1377

1862

} else {

1378

if (debug){

1863

if(debug){

1379

1864

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

1380

1865

" it, or wait\n");

1381

1866

}

1398

1883

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

1399

1884

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

1400

1885

1401

if (debug){

1886

if(debug){

1402

1887

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

1403

1888

block_time);

1404

1889

}

1426

1911

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

1427

1912

}

1428

1913

if(ret != 0){

1429

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

1914

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

1430

1915

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

1431

1916

}

1432

1917

}

1433

1918

}

1434

1919

}

1435

1920

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,

1921

__attribute__((nonnull))

1922

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

1489

1923

const float delay){

1490

struct dirent **direntries;

1924

struct dirent **direntries = NULL;

1925

if(hookdir_fd == -1){

1926

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1927

| O_CLOEXEC);

1928

if(hookdir_fd == -1){

1929

if(errno == ENOENT){

1930

if(debug){

1931

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

1932

" found\n", hookdir);

1933

}

1934

} else {

1935

perror_plus("open");

1936

}

1937

return;

1938

}

1939

}

1940

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

1941

if(devnull == -1){

1942

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

1943

return;

1944

}

1945

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

1946

runnable_hook, alphasort);

1947

if(numhooks == -1){

1948

perror_plus("scandir");

1949

close(devnull);

1950

return;

1951

}

1491

1952

struct dirent *direntry;

1492

1953

int ret;

1493

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

1494

alphasort);

1495

if(numhooks == -1){

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");

1954

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

1955

direntry = direntries[i];

1956

if(debug){

1957

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

1958

direntry->d_name);

1503

1959

}

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){

1960

pid_t hook_pid = fork();

1961

if(hook_pid == 0){

1962

/* Child */

1963

/* Raise privileges */

1964

errno = raise_privileges_permanently();

1965

if(errno != 0){

1966

perror_plus("Failed to raise privileges");

1967

_exit(EX_NOPERM);

1968

}

1969

/* Set group */

1970

errno = 0;

1971

ret = setgid(0);

1972

if(ret == -1){

1973

perror_plus("setgid");

1974

_exit(EX_NOPERM);

1975

}

1976

/* Reset supplementary groups */

1977

errno = 0;

1978

ret = setgroups(0, NULL);

1979

if(ret == -1){

1980

perror_plus("setgroups");

1981

_exit(EX_NOPERM);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

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

1994

if(ret == -1){

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

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

1999

if(ret == -1){

2000

perror_plus("setenv");

2001

_exit(EX_OSERR);

2002

}

2003

char *delaystring;

2004

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

2005

if(ret == -1){

1511

2006

perror_plus("asprintf");

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

}

2007

_exit(EX_OSERR);

2008

}

2009

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

2010

if(ret == -1){

1570

2011

free(delaystring);

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

}

2012

perror_plus("setenv");

2013

_exit(EX_OSERR);

2014

}

2015

free(delaystring);

2016

if(connect_to != NULL){

2017

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

2018

if(ret == -1){

2019

perror_plus("setenv");

2020

_exit(EX_OSERR);

2021

}

2022

}

2023

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

2024

direntry->d_name,

2025

O_RDONLY));

2026

if(hook_fd == -1){

2027

perror_plus("openat");

2028

_exit(EXIT_FAILURE);

2029

}

2030

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

2031

perror_plus("close");

2032

_exit(EXIT_FAILURE);

2033

}

2034

ret = dup2(devnull, STDIN_FILENO);

2035

if(ret == -1){

2036

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

2037

_exit(EX_OSERR);

2038

}

2039

ret = close(devnull);

2040

if(ret == -1){

2041

perror_plus("close");

2042

_exit(EX_OSERR);

2043

}

2044

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2045

if(ret == -1){

2046

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

2047

_exit(EX_OSERR);

2048

}

2049

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

2050

environ) == -1){

2051

perror_plus("fexecve");

2052

_exit(EXIT_FAILURE);

2053

}

2054

} else {

2055

if(hook_pid == -1){

2056

perror_plus("fork");

2057

free(direntry);

2058

continue;

2059

}

2060

int status;

2061

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

2062

perror_plus("waitpid");

2063

free(direntry);

2064

continue;

2065

}

2066

if(WIFEXITED(status)){

2067

if(WEXITSTATUS(status) != 0){

2068

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

2069

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

2070

WEXITSTATUS(status));

2071

free(direntry);

2072

continue;

2073

}

2074

} else if(WIFSIGNALED(status)){

2075

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

2076

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

2077

WTERMSIG(status));

2078

free(direntry);

2079

continue;

1582

2080

} else {

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;

2081

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

2082

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

2083

free(direntry);

2084

continue;

2085

}

2086

}

2087

if(debug){

2088

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

2089

direntry->d_name);

2090

}

2091

free(direntry);

2092

}

2093

free(direntries);

2094

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

2095

perror_plus("close");

2096

} else {

2097

hookdir_fd = -1;

2098

}

2099

close(devnull);

1619

2100

}

1620

2101

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;

2102

__attribute__((nonnull, warn_unused_result))

2103

int bring_up_interface(const char *const interface,

2104

const float delay){

2105

int old_errno = errno;

2106

int ret;

1627

2107

struct ifreq network;

1628

2108

unsigned int if_index = if_nametoindex(interface);

1629

2109

if(if_index == 0){

1638

2118

}

1639

2119

1640

2120

if(not interface_is_up(interface)){

1641

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

2121

int ret_errno = 0;

2122

int ioctl_errno = 0;

2123

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

1642

2124

ret_errno = errno;

1643

2125

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

1644

2126

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

2127

errno = old_errno;

1645

2128

return ret_errno;

1646

2129

}

1647

network.ifr_flags |= IFF_UP;

2130

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

1648

2131

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

2132

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

2133

if(sd == -1){

1651

2134

ret_errno = errno;

1652

2135

perror_plus("socket");

1653

2136

errno = old_errno;

1654

2137

return ret_errno;

1655

2138

}

1656

2139

1657

2140

if(quit_now){

1658

close(sd);

2141

ret = close(sd);

2142

if(ret == -1){

2143

perror_plus("close");

2144

}

1659

2145

errno = old_errno;

1660

2146

return EINTR;

1661

2147

}

1665

2151

interface);

1666

2152

}

1667

2153

1668

/* Raise priviliges */

1669

raise_privileges();

2154

/* Raise privileges */

2155

ret_errno = raise_privileges();

2156

if(ret_errno != 0){

2157

errno = ret_errno;

2158

perror_plus("Failed to raise privileges");

2159

}

1670

2160

1671

2161

#ifdef __linux__

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");

2162

int ret_linux;

2163

bool restore_loglevel = false;

2164

if(ret_errno == 0){

2165

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2166

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

2167

ret_linux = klogctl(8, NULL, 5);

2168

if(ret_linux == -1){

2169

perror_plus("klogctl");

2170

} else {

2171

restore_loglevel = true;

2172

}

1679

2173

}

1680

2174

#endif /* __linux__ */

1681

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

1682

ret_errno = errno;

2175

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

2176

ioctl_errno = errno;

1683

2177

#ifdef __linux__

1684

2178

if(restore_loglevel){

1685

2179

ret_linux = klogctl(7, NULL, 0);

1689

2183

}

1690

2184

#endif /* __linux__ */

1691

2185

1692

/* Lower privileges */

1693

lower_privileges();

2186

/* If raise_privileges() succeeded above */

2187

if(ret_errno == 0){

2188

/* Lower privileges */

2189

ret_errno = lower_privileges();

2190

if(ret_errno != 0){

2191

errno = ret_errno;

2192

perror_plus("Failed to lower privileges");

2193

}

2194

}

1694

2195

1695

2196

/* Close the socket */

1696

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

2197

ret = close(sd);

1697

2198

if(ret == -1){

1698

2199

perror_plus("close");

1699

2200

}

1700

2201

1701

2202

if(ret_setflags == -1){

1702

errno = ret_errno;

2203

errno = ioctl_errno;

1703

2204

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1704

2205

errno = old_errno;

1705

return ret_errno;

2206

return ioctl_errno;

1706

2207

}

1707

2208

} else if(debug){

1708

2209

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

1711

2212

1712

2213

/* Sleep checking until interface is running.

1713

2214

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

1714

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

2215

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

1715

2216

if(interface_is_running(interface)){

1716

2217

break;

1717

2218

}

1726

2227

return 0;

1727

2228

}

1728

2229

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;

2230

__attribute__((nonnull, warn_unused_result))

2231

int take_down_interface(const char *const interface){

2232

int old_errno = errno;

1734

2233

struct ifreq network;

1735

2234

unsigned int if_index = if_nametoindex(interface);

1736

2235

if(if_index == 0){

1739

2238

return ENXIO;

1740

2239

}

1741

2240

if(interface_is_up(interface)){

2241

int ret_errno = 0;

2242

int ioctl_errno = 0;

1742

2243

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

1743

2244

ret_errno = errno;

1744

2245

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

1745

2246

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

2247

errno = old_errno;

1746

2248

return ret_errno;

1747

2249

}

1748

2250

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

1749

2251

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

2252

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

2253

if(sd == -1){

1752

2254

ret_errno = errno;

1753

2255

perror_plus("socket");

1754

2256

errno = old_errno;

1760

2262

interface);

1761

2263

}

1762

2264

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();

2265

/* Raise privileges */

2266

ret_errno = raise_privileges();

2267

if(ret_errno != 0){

2268

errno = ret_errno;

2269

perror_plus("Failed to raise privileges");

2270

}

2271

2272

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

2273

ioctl_errno = errno;

2274

2275

/* If raise_privileges() succeeded above */

2276

if(ret_errno == 0){

2277

/* Lower privileges */

2278

ret_errno = lower_privileges();

2279

if(ret_errno != 0){

2280

errno = ret_errno;

2281

perror_plus("Failed to lower privileges");

2282

}

2283

}

1771

2284

1772

2285

/* Close the socket */

1773

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

2286

int ret = close(sd);

1774

2287

if(ret == -1){

1775

2288

perror_plus("close");

1776

2289

}

1777

2290

1778

2291

if(ret_setflags == -1){

1779

errno = ret_errno;

2292

errno = ioctl_errno;

1780

2293

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1781

2294

errno = old_errno;

1782

return ret_errno;

2295

return ioctl_errno;

1783

2296

}

1784

2297

} else if(debug){

1785

2298

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

1791

2304

}

1792

2305

1793

2306

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

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 };

2307

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

2308

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

2309

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

2310

.current_server = NULL, .interfaces = NULL,

2311

.interfaces_size = 0 };

1798

2312

AvahiSServiceBrowser *sb = NULL;

1799

2313

error_t ret_errno;

1800

2314

int ret;

1803

2317

int exitcode = EXIT_SUCCESS;

1804

2318

char *interfaces_to_take_down = NULL;

1805

2319

size_t interfaces_to_take_down_size = 0;

1806

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

1807

bool tempdir_created = false;

2320

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

2321

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

2322

char *tempdir = NULL;

1808

2323

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1809

2324

const char *seckey = PATHDIR "/" SECKEY;

1810

2325

const char *pubkey = PATHDIR "/" PUBKEY;

2326

const char *dh_params_file = NULL;

1811

2327

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1813

2328

1814

2329

bool gnutls_initialized = false;

1815

2330

bool gpgme_initialized = false;

1867

2382

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

1868

2383

" Diffie-Hellman key exchange",

1869

2384

.group = 2 },

2385

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

2386

.arg = "FILE",

2387

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

2388

" for the Diffie-Hellman key exchange",

2389

.group = 2 },

1870

2390

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

1871

2391

.arg = "STRING",

1872

2392

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

1927

2447

}

1928

2448

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

1929

2449

break;

2450

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

2451

dh_params_file = arg;

2452

break;

1930

2453

case 130: /* --priority */

1931

2454

mc.priority = arg;

1932

2455

break;

1972

2495

.args_doc = "",

1973

2496

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

1974

2497

" passwords from a Mandos server" };

1975

ret = argp_parse(&argp, argc, argv,

1976

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1977

switch(ret){

2498

ret_errno = argp_parse(&argp, argc, argv,

2499

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2500

switch(ret_errno){

1978

2501

case 0:

1979

2502

break;

1980

2503

case ENOMEM:

1981

2504

default:

1982

errno = ret;

2505

errno = ret_errno;

1983

2506

perror_plus("argp_parse");

1984

2507

exitcode = EX_OSERR;

1985

2508

goto end;

1988

2511

goto end;

1989

2512

}

1990

2513

}

1991

2514

1992

2515

{

1993

2516

/* Work around Debian bug #633582:

1994

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

2517

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

1995

2518

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2519

/* Re-raise privileges */

2520

ret = raise_privileges();

2521

if(ret != 0){

2522

errno = ret;

2523

perror_plus("Failed to raise privileges");

2524

} else {

1998

2525

struct stat st;

1999

2526

2000

2527

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

2014

2541

}

2015

2542

}

2016

2543

}

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2544

close(seckey_fd);

2018

2545

}

2019

2546

}

2020

2547

2021

2548

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

2022

2549

int pubkey_fd = open(pubkey, O_RDONLY);

2023

2550

if(pubkey_fd == -1){

2035

2562

}

2036

2563

}

2037

2564

}

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2565

close(pubkey_fd);

2566

}

2567

}

2568

2569

if(dh_params_file != NULL

2570

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

2571

int dhparams_fd = open(dh_params_file, O_RDONLY);

2572

if(dhparams_fd == -1){

2573

perror_plus("open");

2574

} else {

2575

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

2576

if(ret == -1){

2577

perror_plus("fstat");

2578

} else {

2579

if(S_ISREG(st.st_mode)

2580

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

2581

ret = fchown(dhparams_fd, uid, gid);

2582

if(ret == -1){

2583

perror_plus("fchown");

2584

}

2585

}

2586

}

2587

close(dhparams_fd);

2588

}

2589

}

2590

2042

2591

/* Lower privileges */

2043

lower_privileges();

2592

ret = lower_privileges();

2593

if(ret != 0){

2594

errno = ret;

2595

perror_plus("Failed to lower privileges");

2596

}

2044

2597

}

2045

2598

}

2046

2599

2070

2623

goto end;

2071

2624

}

2072

2625

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

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

}

2626

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

2627

}

2628

run_network_hooks("start", interfaces_hooks != NULL ?

2629

interfaces_hooks : "", delay);

2081

2630

}

2082

2631

2083

2632

if(not debug){

2161

2710

2162

2711

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

2163

2712

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2713

struct dirent **direntries = NULL;

2165

2714

/* Look for any good interfaces */

2166

2715

ret = scandir(sys_class_net, &direntries, good_interface,

2167

2716

alphasort);

2171

2720

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

2172

2721

direntries[i]->d_name);

2173

2722

if(ret_errno != 0){

2723

errno = ret_errno;

2174

2724

perror_plus("argz_add");

2725

free(direntries[i]);

2175

2726

continue;

2176

2727

}

2177

2728

if(debug){

2178

2729

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

2179

2730

direntries[i]->d_name);

2180

2731

}

2732

free(direntries[i]);

2181

2733

}

2182

2734

free(direntries);

2183

2735

} else {

2184

free(direntries);

2736

if(ret == 0){

2737

free(direntries);

2738

}

2185

2739

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

2186

2740

exitcode = EXIT_FAILURE;

2187

2741

goto end;

2210

2764

break;

2211

2765

}

2212

2766

bool interface_was_up = interface_is_up(interface);

2213

ret = bring_up_interface(interface, delay);

2767

errno = bring_up_interface(interface, delay);

2214

2768

if(not interface_was_up){

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2769

if(errno != 0){

2770

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

2771

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

2218

2772

} else {

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2773

errno = argz_add(&interfaces_to_take_down,

2774

&interfaces_to_take_down_size,

2775

interface);

2776

if(errno != 0){

2777

perror_plus("argz_add");

2778

}

2222

2779

}

2223

2780

}

2224

2781

}

2240

2797

goto end;

2241

2798

}

2242

2799

2243

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

2800

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

2244

2801

if(ret == -1){

2245

2802

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

2246

2803

exitcode = EX_UNAVAILABLE;

2253

2810

goto end;

2254

2811

}

2255

2812

2256

if(mkdtemp(tempdir) == NULL){

2813

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

2814

tempdir = mkdtemp(run_tempdir);

2815

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

2816

if(debug){

2817

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

2818

run_tempdir, old_tempdir);

2819

}

2820

tempdir = mkdtemp(old_tempdir);

2821

}

2822

if(tempdir == NULL){

2257

2823

perror_plus("mkdtemp");

2258

2824

goto end;

2259

2825

}

2260

tempdir_created = true;

2261

2826

2262

2827

if(quit_now){

2263

2828

goto end;

2338

2903

sleep((unsigned int)retry_interval);

2339

2904

}

2340

2905

2341

if (not quit_now){

2906

if(not quit_now){

2342

2907

exitcode = EXIT_SUCCESS;

2343

2908

}

2344

2909

2360

2925

2361

2926

/* Allocate a new server */

2362

2927

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2363

&config, NULL, NULL, &ret_errno);

2928

&config, NULL, NULL, &ret);

2364

2929

2365

2930

/* Free the Avahi configuration data */

2366

2931

avahi_server_config_free(&config);

2369

2934

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

2370

2935

if(mc.server == NULL){

2371

2936

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

2372

avahi_strerror(ret_errno));

2937

avahi_strerror(ret));

2373

2938

exitcode = EX_UNAVAILABLE;

2374

2939

goto end;

2375

2940

}

2399

2964

if(debug){

2400

2965

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

2401

2966

}

2402

2967

2403

2968

ret = avahi_loop_with_timeout(simple_poll,

2404

2969

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

2405

2970

if(debug){

2410

2975

end:

2411

2976

2412

2977

if(debug){

2413

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

2978

if(signal_received){

2979

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

2980

argv[0], signal_received,

2981

strsignal(signal_received));

2982

} else {

2983

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

2984

}

2414

2985

}

2415

2986

2416

2987

/* Cleanup things */

2427

2998

2428

2999

if(gnutls_initialized){

2429

3000

gnutls_certificate_free_credentials(mc.cred);

2430

gnutls_global_deinit();

2431

3001

gnutls_dh_params_deinit(mc.dh_params);

2432

3002

}

2433

3003

2441

3011

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

2442

3012

while(mc.current_server != NULL){

2443

3013

server *next = mc.current_server->next;

3014

#ifdef __GNUC__

3015

#pragma GCC diagnostic push

3016

#pragma GCC diagnostic ignored "-Wcast-qual"

3017

#endif

3018

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

3019

#ifdef __GNUC__

3020

#pragma GCC diagnostic pop

3021

#endif

2444

3022

free(mc.current_server);

2445

3023

mc.current_server = next;

2446

3024

}

2447

3025

}

2448

3026

2449

/* Re-raise priviliges */

3027

/* Re-raise privileges */

2450

3028

{

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();

3029

ret = raise_privileges();

3030

if(ret != 0){

3031

errno = ret;

3032

perror_plus("Failed to raise privileges");

3033

} else {

3034

3035

/* Run network hooks */

3036

run_network_hooks("stop", interfaces_hooks != NULL ?

3037

interfaces_hooks : "", delay);

3038

3039

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

3040

{

3041

char *interface = NULL;

3042

while((interface = argz_next(interfaces_to_take_down,

3043

interfaces_to_take_down_size,

3044

interface))){

3045

ret = take_down_interface(interface);

3046

if(ret != 0){

3047

errno = ret;

3048

perror_plus("Failed to take down interface");

3049

}

3050

}

3051

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

3052

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

3053

" down\n");

3054

}

3055

}

3056

}

3057

3058

ret = lower_privileges_permanently();

3059

if(ret != 0){

3060

errno = ret;

3061

perror_plus("Failed to lower privileges permanently");

3062

}

2476

3063

}

2477

3064

2478

3065

free(interfaces_to_take_down);

2479

3066

free(interfaces_hooks);

2480

3067

3068

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

3069

uintmax_t level){

3070

struct dirent **direntries = NULL;

3071

int dret;

3072

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

3073

O_RDONLY

3074

| O_NOFOLLOW

3075

| O_DIRECTORY

3076

| O_PATH));

3077

if(dir_fd == -1){

3078

perror_plus("open");

3079

return;

3080

}

3081

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

3082

notdotentries, alphasort);

3083

if(numentries >= 0){

3084

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

3085

if(debug){

3086

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

3087

dirname, direntries[i]->d_name);

3088

}

3089

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

3090

if(dret == -1){

3091

if(errno == EISDIR){

3092

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

3093

AT_REMOVEDIR);

3094

}

3095

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

3096

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

3097

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

3098

/* Recurse only in this special case */

3099

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

3100

dret = 0;

3101

}

3102

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

3103

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

3104

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

3105

}

3106

}

3107

free(direntries[i]);

3108

}

3109

3110

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

3111

free(direntries);

3112

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3113

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

3114

perror_plus("rmdir");

3115

}

3116

} else {

3117

perror_plus("scandirat");

3118

}

3119

close(dir_fd);

3120

}

3121

2481

3122

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

2482

if(tempdir_created){

2483

struct dirent **direntries = NULL;

2484

struct dirent *direntry = NULL;

2485

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

2486

alphasort);

2487

if (numentries > 0){

2488

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

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

}

3123

if(tempdir != NULL){

3124

clean_dir_at(-1, tempdir, 0);

2515

3125

}

2516

3126

2517

3127

if(quit_now){