/mandos/release : revision 237.7.162

9

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

10

*

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* Everything else is

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13

14

*

15

* This file is part of Mandos.

16

*

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

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* 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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*

15

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

16

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

17

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

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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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21

* WITHOUT ANY WARRANTY; without even the implied warranty of

24

22

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

25

23

* General Public License for more details.

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*

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

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

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* along with this program. If not, see

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

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*

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29

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

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30

*/

33

32

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

34

33

#ifndef _LARGEFILE_SOURCE

35

34

#define _LARGEFILE_SOURCE

36

#endif /* not _LARGEFILE_SOURCE */

35

#endif

37

36

#ifndef _FILE_OFFSET_BITS

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37

#define _FILE_OFFSET_BITS 64

39

#endif /* not _FILE_OFFSET_BITS */

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#endif

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39

41

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

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41

43

42

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

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stdout, ferror() */

43

stdout, ferror(), remove() */

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44

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

46

45

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

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46

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

48

47

strtof(), abort() */

49

48

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

50

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

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asprintf(), strncpy(), strsignal()

52

*/

49

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

50

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

53

51

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

54

52

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

55

53

sockaddr_in6, PF_INET6,

57

55

opendir(), DIR */

58

56

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

59

57

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

60

inet_pton(), connect(),

61

getnameinfo() */

62

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

58

inet_pton(), connect() */

59

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

63

60

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

64

61

*/

65

62

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

66

63

strtoimax() */

67

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

68

EAI_SYSTEM, ENETUNREACH,

69

EHOSTUNREACH, ECONNREFUSED, EPROTO,

70

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

71

ENOTEMPTY,

64

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

72

65

program_invocation_short_name */

73

66

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

74

67

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

79

72

*/

80

73

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

81

74

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

82

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

83

unlinkat() */

84

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

75

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

76

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

85

77

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

86

78

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

87

79

argp_state, struct argp,

99

91

argz_delete(), argz_append(),

100

92

argz_stringify(), argz_add(),

101

93

argz_count() */

102

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

103

EAI_SYSTEM, gai_strerror() */

104

94

105

95

#ifdef __linux__

106

96

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

148

138

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

149

139

char *connect_to = NULL;

150

140

const char *hookdir = HOOKDIR;

151

int hookdir_fd = -1;

152

141

uid_t uid = 65534;

153

142

gid_t gid = 65534;

154

143

191

180

perror(print_text);

192

181

}

193

182

194

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

183

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

195

184

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

196

185

va_list ap;

197

186

va_start (ap, format);

198

187

199

188

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

200

189

program_invocation_short_name));

201

return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

190

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

202

191

}

203

192

204

193

/*

206

195

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

207

196

* "buffer_length" is how much is already used.

208

197

*/

209

__attribute__((nonnull, warn_unused_result))

210

198

size_t incbuffer(char **buffer, size_t buffer_length,

211

199

size_t buffer_capacity){

212

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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;

201

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

202

if(buffer == NULL){

219

203

return 0;

220

204

}

221

*buffer = new_buf;

222

205

buffer_capacity += BUFFER_SIZE;

223

206

}

224

207

return buffer_capacity;

225

208

}

226

209

227

210

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

228

__attribute__((nonnull, warn_unused_result))

229

211

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

230

212

int af, server **current_server){

231

213

int ret;

240

222

.af = af };

241

223

if(new_server->ip == NULL){

242

224

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);

258

225

return false;

259

226

}

260

227

/* Special case of first server */

262

229

new_server->next = new_server;

263

230

new_server->prev = new_server;

264

231

*current_server = new_server;

232

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

265

233

} else {

266

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

267

234

new_server->next = *current_server;

268

235

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

269

236

new_server->prev->next = new_server;

270

237

(*current_server)->prev = new_server;

271

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

272

244

return true;

273

245

}

274

246

275

247

/*

276

248

* Initialize GPGME.

277

249

*/

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){

250

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

251

const char *tempdir, mandos_context *mc){

283

252

gpgme_error_t rc;

284

253

gpgme_engine_info_t engine_info;

285

254

286

255

/*

287

256

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

288

257

*/

289

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

290

259

int ret;

291

260

int fd;

292

261

gpgme_data_t pgp_data;

311

280

return false;

312

281

}

313

282

314

ret = close(fd);

283

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

315

284

if(ret == -1){

316

285

perror_plus("close");

317

286

}

373

342

* Decrypt OpenPGP data.

374

343

* Returns -1 on error

375

344

*/

376

__attribute__((nonnull, warn_unused_result))

377

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

378

346

size_t crypto_size,

379

347

char **plaintext,

499

467

return plaintext_length;

500

468

}

501

469

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){

470

static const char * safer_gnutls_strerror(int value){

511

471

const char *ret = gnutls_strerror(value);

512

return safe_string(ret);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

513

475

}

514

476

515

477

/* GnuTLS log function callback */

516

__attribute__((nonnull))

517

478

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

518

479

const char* string){

519

480

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

520

481

}

521

482

522

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

523

483

static int init_gnutls_global(const char *pubkeyfilename,

524

484

const char *seckeyfilename,

525

const char *dhparamsfilename,

526

485

mandos_context *mc){

527

486

int ret;

528

unsigned int uret;

529

487

530

488

if(debug){

531

489

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

532

490

}

533

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

534

499

if(debug){

535

500

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

536

501

* - GnuTLS manual

544

509

if(ret != GNUTLS_E_SUCCESS){

545

510

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

546

511

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

547

513

return -1;

548

514

}

549

515

574

540

safer_gnutls_strerror(ret));

575

541

goto globalfail;

576

542

}

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

close(dhpfile);

617

if(params.data == NULL){

618

dhparamsfilename = NULL;

619

}

620

if(dhparamsfilename == NULL){

621

break;

622

}

623

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

624

GNUTLS_X509_FMT_PEM);

625

if(ret != GNUTLS_E_SUCCESS){

626

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

627

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

628

safer_gnutls_strerror(ret));

629

dhparamsfilename = NULL;

630

}

631

free(params.data);

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

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

637

/* Try to read the private key file */

638

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

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

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

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

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

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

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

689

if(ret != GNUTLS_E_SUCCESS){

690

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

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

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

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

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

726

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

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

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

733

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

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

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

741

mc->dh_bits);

742

}

743

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

744

if(ret != GNUTLS_E_SUCCESS){

745

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

746

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

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

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

751

550

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

752

551

753

552

return 0;

755

554

globalfail:

756

555

757

556

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

758

558

gnutls_dh_params_deinit(mc->dh_params);

759

559

return -1;

760

560

}

761

561

762

__attribute__((nonnull, warn_unused_result))

763

562

static int init_gnutls_session(gnutls_session_t *session,

764

563

mandos_context *mc){

765

564

int ret;

812

611

/* ignore client certificate if any. */

813

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

814

613

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

815

616

return 0;

816

617

}

817

618

819

620

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

820

621

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

821

622

822

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

823

__attribute__((warn_unused_result))

824

int raise_privileges(void){

825

int old_errno = errno;

826

int ret = 0;

827

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

828

ret = errno;

829

}

830

errno = old_errno;

831

return ret;

832

}

833

834

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

835

__attribute__((warn_unused_result))

836

int raise_privileges_permanently(void){

837

int old_errno = errno;

838

int ret = raise_privileges();

839

if(ret != 0){

840

errno = old_errno;

841

return ret;

842

}

843

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

844

ret = errno;

845

}

846

errno = old_errno;

847

return ret;

848

}

849

850

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

851

__attribute__((warn_unused_result))

852

int lower_privileges(void){

853

int old_errno = errno;

854

int ret = 0;

855

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

856

ret = errno;

857

}

858

errno = old_errno;

859

return ret;

860

}

861

862

/* Lower privileges permanently */

863

__attribute__((warn_unused_result))

864

int lower_privileges_permanently(void){

865

int old_errno = errno;

866

int ret = 0;

867

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

868

ret = errno;

869

}

870

errno = old_errno;

871

return ret;

872

}

873

874

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

875

__attribute__((nonnull, warn_unused_result))

876

static bool add_delete_local_route(const bool add,

877

const char *address,

878

AvahiIfIndex if_index){

879

int ret;

880

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

881

char add_arg[] = "add";

882

char delete_arg[] = "delete";

883

char debug_flag[] = "--debug";

884

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

885

if(pluginhelperdir == NULL){

886

if(debug){

887

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

888

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

889

}

890

return false;

891

}

892

893

char interface[IF_NAMESIZE];

894

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

895

perror_plus("if_indextoname");

896

return false;

897

}

898

899

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

900

if(devnull == -1){

901

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

902

return false;

903

}

904

pid_t pid = fork();

905

if(pid == 0){

906

/* Child */

907

/* Raise privileges */

908

errno = raise_privileges_permanently();

909

if(errno != 0){

910

perror_plus("Failed to raise privileges");

911

/* _exit(EX_NOPERM); */

912

} else {

913

/* Set group */

914

errno = 0;

915

ret = setgid(0);

916

if(ret == -1){

917

perror_plus("setgid");

918

_exit(EX_NOPERM);

919

}

920

/* Reset supplementary groups */

921

errno = 0;

922

ret = setgroups(0, NULL);

923

if(ret == -1){

924

perror_plus("setgroups");

925

_exit(EX_NOPERM);

926

}

927

}

928

ret = dup2(devnull, STDIN_FILENO);

929

if(ret == -1){

930

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

931

_exit(EX_OSERR);

932

}

933

ret = close(devnull);

934

if(ret == -1){

935

perror_plus("close");

936

_exit(EX_OSERR);

937

}

938

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

939

if(ret == -1){

940

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

941

_exit(EX_OSERR);

942

}

943

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

944

O_RDONLY

945

| O_DIRECTORY

946

| O_PATH

947

| O_CLOEXEC));

948

if(helperdir_fd == -1){

949

perror_plus("open");

950

_exit(EX_UNAVAILABLE);

951

}

952

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

953

helper, O_RDONLY));

954

if(helper_fd == -1){

955

perror_plus("openat");

956

close(helperdir_fd);

957

_exit(EX_UNAVAILABLE);

958

}

959

close(helperdir_fd);

960

#ifdef __GNUC__

961

#pragma GCC diagnostic push

962

#pragma GCC diagnostic ignored "-Wcast-qual"

963

#endif

964

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

965

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

966

interface, debug ? debug_flag : NULL, NULL },

967

environ) == -1){

968

#ifdef __GNUC__

969

#pragma GCC diagnostic pop

970

#endif

971

perror_plus("fexecve");

972

_exit(EXIT_FAILURE);

973

}

974

}

975

if(pid == -1){

976

perror_plus("fork");

977

return false;

978

}

979

int status;

980

pid_t pret = -1;

981

errno = 0;

982

do {

983

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

984

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

985

int errno_raising = 0;

986

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

987

errno_raising = errno;

988

perror_plus("Failed to raise privileges in order to"

989

" kill helper program");

990

}

991

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

992

perror_plus("kill");

993

}

994

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

995

perror_plus("Failed to lower privileges after killing"

996

" helper program");

997

}

998

return false;

999

}

1000

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

1001

if(pret == -1){

1002

perror_plus("waitpid");

1003

return false;

1004

}

1005

if(WIFEXITED(status)){

1006

if(WEXITSTATUS(status) != 0){

1007

fprintf_plus(stderr, "Error: iprouteadddel exited"

1008

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

1009

return false;

1010

}

1011

return true;

1012

}

1013

if(WIFSIGNALED(status)){

1014

fprintf_plus(stderr, "Error: iprouteadddel died by"

1015

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

1016

return false;

1017

}

1018

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

1019

return false;

1020

}

1021

1022

__attribute__((nonnull, warn_unused_result))

1023

static bool add_local_route(const char *address,

1024

AvahiIfIndex if_index){

1025

if(debug){

1026

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

1027

}

1028

return add_delete_local_route(true, address, if_index);

1029

}

1030

1031

__attribute__((nonnull, warn_unused_result))

1032

static bool delete_local_route(const char *address,

1033

AvahiIfIndex if_index){

1034

if(debug){

1035

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

1036

}

1037

return add_delete_local_route(false, address, if_index);

1038

}

1039

1040

623

/* Called when a Mandos server is found */

1041

__attribute__((nonnull, warn_unused_result))

1042

624

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

1043

625

AvahiIfIndex if_index,

1044

626

int af, mandos_context *mc){

1045

627

int ret, tcp_sd = -1;

1046

628

ssize_t sret;

1047

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1048

633

char *buffer = NULL;

1049

634

char *decrypted_buffer = NULL;

1050

635

size_t buffer_length = 0;

1053

638

int retval = -1;

1054

639

gnutls_session_t session;

1055

640

int pf; /* Protocol family */

1056

bool route_added = false;

1057

641

1058

642

errno = 0;

1059

643

1081

665

bool match = false;

1082

666

{

1083

667

char *interface = NULL;

1084

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

1085

mc->interfaces_size,

1086

interface))){

668

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

669

interface))){

1087

670

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

1088

671

match = true;

1089

672

break;

1118

701

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

1119

702

}

1120

703

1121

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

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1122

705

if(tcp_sd < 0){

1123

706

int e = errno;

1124

707

perror_plus("socket");

1131

714

goto mandos_end;

1132

715

}

1133

716

717

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

1134

718

if(af == AF_INET6){

1135

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

1136

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

1137

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);

1138

721

} else { /* IPv4 */

1139

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

1140

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

1141

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);

1142

724

}

1143

725

if(ret < 0 ){

1144

726

int e = errno;

1153

735

goto mandos_end;

1154

736

}

1155

737

if(af == AF_INET6){

1156

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

1157

if(IN6_IS_ADDR_LINKLOCAL

1158

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

738

to.in6.sin6_port = htons(port);

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

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

741

-Wunreachable-code*/

1159

742

if(if_index == AVAHI_IF_UNSPEC){

1160

743

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

1161

744

" incomplete without a network interface\n");

1163

746

goto mandos_end;

1164

747

}

1165

748

/* Set the network interface number as scope */

1166

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

749

to.in6.sin6_scope_id = (uint32_t)if_index;

1167

750

}

1168

751

} else {

1169

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

752

to.in.sin_port = htons(port); /* Spurious warnings from

753

-Wconversion and

754

-Wunreachable-code */

1170

755

}

1171

756

1172

757

if(quit_now){

1189

774

}

1190

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1191

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1192

if(af == AF_INET6){

1193

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

1194

sizeof(struct sockaddr_in6),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

} else {

1198

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

1199

sizeof(struct sockaddr_in),

1200

addrstr, sizeof(addrstr), NULL, 0,

1201

NI_NUMERICHOST);

1202

}

1203

if(ret == EAI_SYSTEM){

1204

perror_plus("getnameinfo");

1205

} else if(ret != 0) {

1206

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

1207

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

1208

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

1209

}

1210

}

1211

1212

if(quit_now){

1213

errno = EINTR;

1214

goto mandos_end;

1215

}

1216

1217

while(true){

1218

if(af == AF_INET6){

1219

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

1220

sizeof(struct sockaddr_in6));

1221

} else {

1222

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

1223

sizeof(struct sockaddr_in));

1224

}

1225

if(ret < 0){

1226

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

1227

and if_index != AVAHI_IF_UNSPEC

1228

and connect_to == NULL

1229

and not route_added and

1230

((af == AF_INET6 and not

1231

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1232

&to)->sin6_addr)))

1233

or (af == AF_INET and

1234

/* Not a a IPv4LL address */

1235

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

1236

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

1237

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

1238

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

1239

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

1240

connect to a Mandos server announced by Avahi on a server

1241

host with a global address. Work around this by retrying

1242

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

1243

1244

Avahi bug reference:

1245

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

1246

https://bugs.debian.org/587961

1247

*/

1248

if(debug){

1249

fprintf_plus(stderr, "Mandos server unreachable, trying"

1250

" direct route\n");

1251

}

1252

int e = errno;

1253

route_added = add_local_route(ip, if_index);

1254

if(route_added){

1255

continue;

1256

}

1257

errno = e;

1258

}

1259

if(errno != ECONNREFUSED or debug){

1260

int e = errno;

1261

perror_plus("connect");

1262

errno = e;

1263

}

1264

goto mandos_end;

1265

}

1266

1267

if(quit_now){

1268

errno = EINTR;

1269

goto mandos_end;

1270

}

1271

break;

777

const char *pcret;

778

if(af == AF_INET6){

779

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

780

sizeof(addrstr));

781

} else {

782

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

783

sizeof(addrstr));

784

}

785

if(pcret == NULL){

786

perror_plus("inet_ntop");

787

} else {

788

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

789

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

790

}

791

}

792

}

793

794

if(quit_now){

795

errno = EINTR;

796

goto mandos_end;

797

}

798

799

if(af == AF_INET6){

800

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

801

} else {

802

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

803

}

804

if(ret < 0){

805

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

806

int e = errno;

807

perror_plus("connect");

808

errno = e;

809

}

810

goto mandos_end;

811

}

812

813

if(quit_now){

814

errno = EINTR;

815

goto mandos_end;

1272

816

}

1273

817

1274

818

const char *out = mandos_protocol_version;

1428

972

&decrypted_buffer, mc);

1429

973

if(decrypted_buffer_size >= 0){

1430

974

1431

clearerr(stdout);

1432

975

written = 0;

1433

976

while(written < (size_t) decrypted_buffer_size){

1434

977

if(quit_now){

1450

993

}

1451

994

written += (size_t)ret;

1452

995

}

1453

ret = fflush(stdout);

1454

if(ret != 0){

1455

int e = errno;

1456

if(debug){

1457

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

1458

strerror(errno));

1459

}

1460

errno = e;

1461

goto mandos_end;

1462

}

1463

996

retval = 0;

1464

997

}

1465

998

}

1468

1001

1469

1002

mandos_end:

1470

1003

{

1471

if(route_added){

1472

if(not delete_local_route(ip, if_index)){

1473

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

1474

" interface %d", ip, if_index);

1475

}

1476

}

1477

1004

int e = errno;

1478

1005

free(decrypted_buffer);

1479

1006

free(buffer);

1480

1007

if(tcp_sd >= 0){

1481

ret = close(tcp_sd);

1008

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

1482

1009

}

1483

1010

if(ret == -1){

1484

1011

if(e == 0){

1509

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

1510

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1511

1038

flags,

1512

void *mc){

1039

void* mc){

1513

1040

if(r == NULL){

1514

1041

return;

1515

1042

}

1518

1045

timed out */

1519

1046

1520

1047

if(quit_now){

1521

avahi_s_service_resolver_free(r);

1522

1048

return;

1523

1049

}

1524

1050

1569

1095

const char *domain,

1570

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1571

1097

flags,

1572

void *mc){

1098

void* mc){

1573

1099

if(b == NULL){

1574

1100

return;

1575

1101

}

1635

1161

errno = old_errno;

1636

1162

}

1637

1163

1638

__attribute__((nonnull, warn_unused_result))

1639

1164

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

1640

1165

int ret;

1641

int old_errno;

1166

error_t ret_errno;

1642

1167

1643

1168

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

1644

1169

if(s < 0){

1645

old_errno = errno;

1170

ret_errno = errno;

1646

1171

perror_plus("socket");

1647

errno = old_errno;

1172

errno = ret_errno;

1648

1173

return false;

1649

1174

}

1650

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

1651

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

1175

strcpy(ifr->ifr_name, ifname);

1652

1176

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1653

1177

if(ret == -1){

1654

1178

if(debug){

1655

old_errno = errno;

1179

ret_errno = errno;

1656

1180

perror_plus("ioctl SIOCGIFFLAGS");

1657

errno = old_errno;

1181

errno = ret_errno;

1658

1182

}

1659

close(s);

1660

1183

return false;

1661

1184

}

1662

close(s);

1663

1185

return true;

1664

1186

}

1665

1187

1666

__attribute__((nonnull, warn_unused_result))

1667

1188

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

1668

1189

1669

1190

/* Reject the loopback device */

1711

1232

* corresponds to an acceptable network device.

1712

1233

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

1713

1234

*/

1714

__attribute__((nonnull, warn_unused_result))

1715

1235

int good_interface(const struct dirent *if_entry){

1716

1236

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

1717

1237

return 0;

1735

1255

/*

1736

1256

* This function determines if a network interface is up.

1737

1257

*/

1738

__attribute__((nonnull, warn_unused_result))

1739

1258

bool interface_is_up(const char *interface){

1740

1259

struct ifreq ifr;

1741

1260

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

1752

1271

/*

1753

1272

* This function determines if a network interface is running

1754

1273

*/

1755

__attribute__((nonnull, warn_unused_result))

1756

1274

bool interface_is_running(const char *interface){

1757

1275

struct ifreq ifr;

1758

1276

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

1766

1284

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

1767

1285

}

1768

1286

1769

__attribute__((nonnull, pure, warn_unused_result))

1770

1287

int notdotentries(const struct dirent *direntry){

1771

1288

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

1772

1289

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

1779

1296

}

1780

1297

1781

1298

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

1782

__attribute__((nonnull, warn_unused_result))

1783

1299

int runnable_hook(const struct dirent *direntry){

1784

1300

int ret;

1785

1301

size_t sret;

1793

1309

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

1794

1310

"abcdefghijklmnopqrstuvwxyz"

1795

1311

"0123456789"

1796

"_.-");

1312

"_-");

1797

1313

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

1798

1314

/* Contains non-allowed characters */

1799

1315

if(debug){

1803

1319

return 0;

1804

1320

}

1805

1321

1806

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

1322

char *fullname = NULL;

1323

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

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

1807

1330

if(ret == -1){

1808

1331

if(debug){

1809

1332

perror_plus("Could not stat hook");

1833

1356

return 1;

1834

1357

}

1835

1358

1836

__attribute__((nonnull, warn_unused_result))

1837

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1838

1360

mandos_context *mc){

1839

1361

int ret;

1843

1365

1844

1366

while(true){

1845

1367

if(mc->current_server == NULL){

1846

if(debug){

1368

if (debug){

1847

1369

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

1848

1370

" No timeout!\n");

1849

1371

}

1850

1372

ret = avahi_simple_poll_iterate(s, -1);

1851

1373

} else {

1852

if(debug){

1374

if (debug){

1853

1375

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

1854

1376

" it, or wait\n");

1855

1377

}

1872

1394

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

1873

1395

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

1874

1396

1875

if(debug){

1397

if (debug){

1876

1398

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

1877

1399

block_time);

1878

1400

}

1900

1422

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

1901

1423

}

1902

1424

if(ret != 0){

1903

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

1425

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

1904

1426

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

1905

1427

}

1906

1428

}

1907

1429

}

1908

1430

}

1909

1431

1910

__attribute__((nonnull))

1911

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

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1912

1485

const float delay){

1913

struct dirent **direntries = NULL;

1914

if(hookdir_fd == -1){

1915

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1916

| O_CLOEXEC);

1917

if(hookdir_fd == -1){

1918

if(errno == ENOENT){

1919

if(debug){

1920

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

1921

" found\n", hookdir);

1922

}

1923

} else {

1924

perror_plus("open");

1925

}

1926

return;

1927

}

1928

}

1929

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

1930

if(devnull == -1){

1931

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

1932

return;

1933

}

1934

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

1935

runnable_hook, alphasort);

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

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

1490

alphasort);

1936

1491

if(numhooks == -1){

1937

perror_plus("scandir");

1938

close(devnull);

1939

return;

1940

}

1941

struct dirent *direntry;

1942

int ret;

1943

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

1944

direntry = direntries[i];

1945

if(debug){

1946

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

1947

direntry->d_name);

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1948

1499

}

1949

pid_t hook_pid = fork();

1950

if(hook_pid == 0){

1951

/* Child */

1952

/* Raise privileges */

1953

errno = raise_privileges_permanently();

1954

if(errno != 0){

1955

perror_plus("Failed to raise privileges");

1956

_exit(EX_NOPERM);

1957

}

1958

/* Set group */

1959

errno = 0;

1960

ret = setgid(0);

1961

if(ret == -1){

1962

perror_plus("setgid");

1963

_exit(EX_NOPERM);

1964

}

1965

/* Reset supplementary groups */

1966

errno = 0;

1967

ret = setgroups(0, NULL);

1968

if(ret == -1){

1969

perror_plus("setgroups");

1970

_exit(EX_NOPERM);

1971

}

1972

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

1973

if(ret == -1){

1974

perror_plus("setenv");

1975

_exit(EX_OSERR);

1976

}

1977

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

1978

if(ret == -1){

1979

perror_plus("setenv");

1980

_exit(EX_OSERR);

1981

}

1982

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

1983

if(ret == -1){

1984

perror_plus("setenv");

1985

_exit(EX_OSERR);

1986

}

1987

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

1988

if(ret == -1){

1989

perror_plus("setenv");

1990

_exit(EX_OSERR);

1991

}

1992

char *delaystring;

1993

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

1994

if(ret == -1){

1500

} else {

1501

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

1502

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

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

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

1506

if(ret < 0){

1995

1507

perror_plus("asprintf");

1996

_exit(EX_OSERR);

1997

}

1998

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

1999

if(ret == -1){

1508

continue;

1509

}

1510

if(debug){

1511

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

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

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

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

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

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

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

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

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

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

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

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

2000

1566

free(delaystring);

2001

perror_plus("setenv");

2002

_exit(EX_OSERR);

2003

}

2004

free(delaystring);

2005

if(connect_to != NULL){

2006

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

2007

if(ret == -1){

2008

perror_plus("setenv");

2009

_exit(EX_OSERR);

2010

}

2011

}

2012

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

2013

direntry->d_name,

2014

O_RDONLY));

2015

if(hook_fd == -1){

2016

perror_plus("openat");

2017

_exit(EXIT_FAILURE);

2018

}

2019

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

2020

perror_plus("close");

2021

_exit(EXIT_FAILURE);

2022

}

2023

ret = dup2(devnull, STDIN_FILENO);

2024

if(ret == -1){

2025

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

2026

_exit(EX_OSERR);

2027

}

2028

ret = close(devnull);

2029

if(ret == -1){

2030

perror_plus("close");

2031

_exit(EX_OSERR);

2032

}

2033

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2034

if(ret == -1){

2035

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

2036

_exit(EX_OSERR);

2037

}

2038

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

2039

environ) == -1){

2040

perror_plus("fexecve");

2041

_exit(EXIT_FAILURE);

2042

}

2043

} else {

2044

if(hook_pid == -1){

2045

perror_plus("fork");

2046

free(direntry);

2047

continue;

2048

}

2049

int status;

2050

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

2051

perror_plus("waitpid");

2052

free(direntry);

2053

continue;

2054

}

2055

if(WIFEXITED(status)){

2056

if(WEXITSTATUS(status) != 0){

2057

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

2058

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

2059

WEXITSTATUS(status));

2060

free(direntry);

2061

continue;

2062

}

2063

} else if(WIFSIGNALED(status)){

2064

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

2065

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

2066

WTERMSIG(status));

2067

free(direntry);

2068

continue;

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

2069

1578

} else {

2070

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

2071

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

2072

free(direntry);

2073

continue;

2074

}

2075

}

2076

if(debug){

2077

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

2078

direntry->d_name);

2079

}

2080

free(direntry);

2081

}

2082

free(direntries);

2083

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

2084

perror_plus("close");

2085

} else {

2086

hookdir_fd = -1;

2087

}

2088

close(devnull);

1579

int status;

1580

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

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

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

1588

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

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

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

1595

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

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

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

1601

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

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

2089

1615

}

2090

1616

2091

__attribute__((nonnull, warn_unused_result))

2092

int bring_up_interface(const char *const interface,

2093

const float delay){

2094

int old_errno = errno;

2095

int ret;

1617

error_t bring_up_interface(const char *const interface,

1618

const float delay){

1619

int sd = -1;

1620

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

2096

1623

struct ifreq network;

2097

1624

unsigned int if_index = if_nametoindex(interface);

2098

1625

if(if_index == 0){

2107

1634

}

2108

1635

2109

1636

if(not interface_is_up(interface)){

2110

int ret_errno = 0;

2111

int ioctl_errno = 0;

2112

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

1637

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

2113

1638

ret_errno = errno;

2114

1639

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

2115

1640

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

2116

errno = old_errno;

2117

1641

return ret_errno;

2118

1642

}

2119

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

1643

network.ifr_flags |= IFF_UP;

2120

1644

2121

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

2122

if(sd == -1){

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

2123

1647

ret_errno = errno;

2124

1648

perror_plus("socket");

2125

1649

errno = old_errno;

2126

1650

return ret_errno;

2127

1651

}

2128

1652

2129

1653

if(quit_now){

2130

ret = close(sd);

2131

if(ret == -1){

2132

perror_plus("close");

2133

}

1654

close(sd);

2134

1655

errno = old_errno;

2135

1656

return EINTR;

2136

1657

}

2140

1661

interface);

2141

1662

}

2142

1663

2143

/* Raise privileges */

2144

ret_errno = raise_privileges();

2145

if(ret_errno != 0){

2146

errno = ret_errno;

2147

perror_plus("Failed to raise privileges");

2148

}

1664

/* Raise priviliges */

1665

raise_privileges();

2149

1666

2150

1667

#ifdef __linux__

2151

int ret_linux;

2152

bool restore_loglevel = false;

2153

if(ret_errno == 0){

2154

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2155

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

2156

ret_linux = klogctl(8, NULL, 5);

2157

if(ret_linux == -1){

2158

perror_plus("klogctl");

2159

} else {

2160

restore_loglevel = true;

2161

}

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

2162

1675

}

2163

1676

#endif /* __linux__ */

2164

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

2165

ioctl_errno = errno;

1677

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

1678

ret_errno = errno;

2166

1679

#ifdef __linux__

2167

1680

if(restore_loglevel){

2168

1681

ret_linux = klogctl(7, NULL, 0);

2172

1685

}

2173

1686

#endif /* __linux__ */

2174

1687

2175

/* If raise_privileges() succeeded above */

2176

if(ret_errno == 0){

2177

/* Lower privileges */

2178

ret_errno = lower_privileges();

2179

if(ret_errno != 0){

2180

errno = ret_errno;

2181

perror_plus("Failed to lower privileges");

2182

}

2183

}

1688

/* Lower privileges */

1689

lower_privileges();

2184

1690

2185

1691

/* Close the socket */

2186

ret = close(sd);

1692

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

2187

1693

if(ret == -1){

2188

1694

perror_plus("close");

2189

1695

}

2190

1696

2191

1697

if(ret_setflags == -1){

2192

errno = ioctl_errno;

1698

errno = ret_errno;

2193

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2194

1700

errno = old_errno;

2195

return ioctl_errno;

1701

return ret_errno;

2196

1702

}

2197

1703

} else if(debug){

2198

1704

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

2201

1707

2202

1708

/* Sleep checking until interface is running.

2203

1709

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

2204

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

1710

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

2205

1711

if(interface_is_running(interface)){

2206

1712

break;

2207

1713

}

2216

1722

return 0;

2217

1723

}

2218

1724

2219

__attribute__((nonnull, warn_unused_result))

2220

int take_down_interface(const char *const interface){

2221

int old_errno = errno;

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

2222

1730

struct ifreq network;

2223

1731

unsigned int if_index = if_nametoindex(interface);

2224

1732

if(if_index == 0){

2227

1735

return ENXIO;

2228

1736

}

2229

1737

if(interface_is_up(interface)){

2230

int ret_errno = 0;

2231

int ioctl_errno = 0;

2232

1738

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

2233

1739

ret_errno = errno;

2234

1740

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

2235

1741

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

2236

errno = old_errno;

2237

1742

return ret_errno;

2238

1743

}

2239

1744

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

2240

1745

2241

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

2242

if(sd == -1){

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

2243

1748

ret_errno = errno;

2244

1749

perror_plus("socket");

2245

1750

errno = old_errno;

2251

1756

interface);

2252

1757

}

2253

1758

2254

/* Raise privileges */

2255

ret_errno = raise_privileges();

2256

if(ret_errno != 0){

2257

errno = ret_errno;

2258

perror_plus("Failed to raise privileges");

2259

}

2260

2261

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

2262

ioctl_errno = errno;

2263

2264

/* If raise_privileges() succeeded above */

2265

if(ret_errno == 0){

2266

/* Lower privileges */

2267

ret_errno = lower_privileges();

2268

if(ret_errno != 0){

2269

errno = ret_errno;

2270

perror_plus("Failed to lower privileges");

2271

}

2272

}

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

2273

1767

2274

1768

/* Close the socket */

2275

int ret = close(sd);

1769

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

2276

1770

if(ret == -1){

2277

1771

perror_plus("close");

2278

1772

}

2279

1773

2280

1774

if(ret_setflags == -1){

2281

errno = ioctl_errno;

1775

errno = ret_errno;

2282

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2283

1777

errno = old_errno;

2284

return ioctl_errno;

1778

return ret_errno;

2285

1779

}

2286

1780

} else if(debug){

2287

1781

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

2293

1787

}

2294

1788

2295

1789

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

2296

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

2297

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

2298

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

2299

.current_server = NULL, .interfaces = NULL,

2300

.interfaces_size = 0 };

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

2301

1794

AvahiSServiceBrowser *sb = NULL;

2302

1795

error_t ret_errno;

2303

1796

int ret;

2306

1799

int exitcode = EXIT_SUCCESS;

2307

1800

char *interfaces_to_take_down = NULL;

2308

1801

size_t interfaces_to_take_down_size = 0;

2309

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

2310

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

2311

char *tempdir = NULL;

1802

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

1803

bool tempdir_created = false;

2312

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2313

1805

const char *seckey = PATHDIR "/" SECKEY;

2314

1806

const char *pubkey = PATHDIR "/" PUBKEY;

2315

const char *dh_params_file = NULL;

2316

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

2317

1809

2318

1810

bool gnutls_initialized = false;

2319

1811

bool gpgme_initialized = false;

2371

1863

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

2372

1864

" Diffie-Hellman key exchange",

2373

1865

.group = 2 },

2374

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

2375

.arg = "FILE",

2376

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

2377

" for the Diffie-Hellman key exchange",

2378

.group = 2 },

2379

1866

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

2380

1867

.arg = "STRING",

2381

1868

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

2436

1923

}

2437

1924

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

2438

1925

break;

2439

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

2440

dh_params_file = arg;

2441

break;

2442

1926

case 130: /* --priority */

2443

1927

mc.priority = arg;

2444

1928

break;

2484

1968

.args_doc = "",

2485

1969

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

2486

1970

" passwords from a Mandos server" };

2487

ret_errno = argp_parse(&argp, argc, argv,

2488

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2489

switch(ret_errno){

1971

ret = argp_parse(&argp, argc, argv,

1972

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1973

switch(ret){

2490

1974

case 0:

2491

1975

break;

2492

1976

case ENOMEM:

2493

1977

default:

2494

errno = ret_errno;

1978

errno = ret;

2495

1979

perror_plus("argp_parse");

2496

1980

exitcode = EX_OSERR;

2497

1981

goto end;

2500

1984

goto end;

2501

1985

}

2502

1986

}

2503

1987

2504

1988

{

2505

1989

/* Work around Debian bug #633582:

2506

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

1990

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

2507

1991

2508

/* Re-raise privileges */

2509

ret = raise_privileges();

2510

if(ret != 0){

2511

errno = ret;

2512

perror_plus("Failed to raise privileges");

2513

} else {

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2514

1994

struct stat st;

2515

1995

2516

1996

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

2530

2010

}

2531

2011

}

2532

2012

}

2533

close(seckey_fd);

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2534

2014

}

2535

2015

}

2536

2016

2537

2017

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

2538

2018

int pubkey_fd = open(pubkey, O_RDONLY);

2539

2019

if(pubkey_fd == -1){

2551

2031

}

2552

2032

}

2553

2033

}

2554

close(pubkey_fd);

2555

}

2556

}

2557

2558

if(dh_params_file != NULL

2559

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

2560

int dhparams_fd = open(dh_params_file, O_RDONLY);

2561

if(dhparams_fd == -1){

2562

perror_plus("open");

2563

} else {

2564

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

2565

if(ret == -1){

2566

perror_plus("fstat");

2567

} else {

2568

if(S_ISREG(st.st_mode)

2569

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

2570

ret = fchown(dhparams_fd, uid, gid);

2571

if(ret == -1){

2572

perror_plus("fchown");

2573

}

2574

}

2575

}

2576

close(dhparams_fd);

2577

}

2578

}

2579

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2580

2038

/* Lower privileges */

2581

ret = lower_privileges();

2582

if(ret != 0){

2583

errno = ret;

2584

perror_plus("Failed to lower privileges");

2585

}

2039

lower_privileges();

2586

2040

}

2587

2041

}

2588

2042

2612

2066

goto end;

2613

2067

}

2614

2068

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

2615

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

2616

}

2617

run_network_hooks("start", interfaces_hooks != NULL ?

2618

interfaces_hooks : "", delay);

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

2619

2077

}

2620

2078

2621

2079

if(not debug){

2699

2157

2700

2158

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

2701

2159

if(mc.interfaces == NULL){

2702

struct dirent **direntries = NULL;

2160

struct dirent **direntries;

2703

2161

/* Look for any good interfaces */

2704

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2705

2163

alphasort);

2709

2167

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

2710

2168

direntries[i]->d_name);

2711

2169

if(ret_errno != 0){

2712

errno = ret_errno;

2713

2170

perror_plus("argz_add");

2714

free(direntries[i]);

2715

2171

continue;

2716

2172

}

2717

2173

if(debug){

2718

2174

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

2719

2175

direntries[i]->d_name);

2720

2176

}

2721

free(direntries[i]);

2722

2177

}

2723

2178

free(direntries);

2724

2179

} else {

2725

if(ret == 0){

2726

free(direntries);

2727

}

2180

free(direntries);

2728

2181

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

2729

2182

exitcode = EXIT_FAILURE;

2730

2183

goto end;

2753

2206

break;

2754

2207

}

2755

2208

bool interface_was_up = interface_is_up(interface);

2756

errno = bring_up_interface(interface, delay);

2209

ret = bring_up_interface(interface, delay);

2757

2210

if(not interface_was_up){

2758

if(errno != 0){

2759

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

2760

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

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2761

2214

} else {

2762

errno = argz_add(&interfaces_to_take_down,

2763

&interfaces_to_take_down_size,

2764

interface);

2765

if(errno != 0){

2766

perror_plus("argz_add");

2767

}

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2768

2218

}

2769

2219

}

2770

2220

}

2786

2236

goto end;

2787

2237

}

2788

2238

2789

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

2239

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

2790

2240

if(ret == -1){

2791

2241

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

2792

2242

exitcode = EX_UNAVAILABLE;

2799

2249

goto end;

2800

2250

}

2801

2251

2802

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

2803

tempdir = mkdtemp(run_tempdir);

2804

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

2805

if(debug){

2806

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

2807

run_tempdir, old_tempdir);

2808

}

2809

tempdir = mkdtemp(old_tempdir);

2810

}

2811

if(tempdir == NULL){

2252

if(mkdtemp(tempdir) == NULL){

2812

2253

perror_plus("mkdtemp");

2813

2254

goto end;

2814

2255

}

2256

tempdir_created = true;

2815

2257

2816

2258

if(quit_now){

2817

2259

goto end;

2889

2331

fprintf_plus(stderr, "Retrying in %d seconds\n",

2890

2332

(int)retry_interval);

2891

2333

}

2892

sleep((unsigned int)retry_interval);

2334

sleep((int)retry_interval);

2893

2335

}

2894

2336

2895

if(not quit_now){

2337

if (not quit_now){

2896

2338

exitcode = EXIT_SUCCESS;

2897

2339

}

2898

2340

2914

2356

2915

2357

/* Allocate a new server */

2916

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2917

&config, NULL, NULL, &ret);

2359

&config, NULL, NULL, &ret_errno);

2918

2360

2919

2361

/* Free the Avahi configuration data */

2920

2362

avahi_server_config_free(&config);

2923

2365

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

2924

2366

if(mc.server == NULL){

2925

2367

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

2926

avahi_strerror(ret));

2368

avahi_strerror(ret_errno));

2927

2369

exitcode = EX_UNAVAILABLE;

2928

2370

goto end;

2929

2371

}

2953

2395

if(debug){

2954

2396

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

2955

2397

}

2956

2398

2957

2399

ret = avahi_loop_with_timeout(simple_poll,

2958

2400

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

2959

2401

if(debug){

2964

2406

end:

2965

2407

2966

2408

if(debug){

2967

if(signal_received){

2968

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

2969

argv[0], signal_received,

2970

strsignal(signal_received));

2971

} else {

2972

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

2973

}

2409

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

2974

2410

}

2975

2411

2976

2412

/* Cleanup things */

2987

2423

2988

2424

if(gnutls_initialized){

2989

2425

gnutls_certificate_free_credentials(mc.cred);

2426

gnutls_global_deinit();

2990

2427

gnutls_dh_params_deinit(mc.dh_params);

2991

2428

}

2992

2429

3000

2437

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

3001

2438

while(mc.current_server != NULL){

3002

2439

server *next = mc.current_server->next;

3003

#ifdef __GNUC__

3004

#pragma GCC diagnostic push

3005

#pragma GCC diagnostic ignored "-Wcast-qual"

3006

#endif

3007

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

3008

#ifdef __GNUC__

3009

#pragma GCC diagnostic pop

3010

#endif

3011

2440

free(mc.current_server);

3012

2441

mc.current_server = next;

3013

2442

}

3014

2443

}

3015

2444

3016

/* Re-raise privileges */

2445

/* Re-raise priviliges */

3017

2446

{

3018

ret = raise_privileges();

3019

if(ret != 0){

3020

errno = ret;

3021

perror_plus("Failed to raise privileges");

3022

} else {

3023

3024

/* Run network hooks */

3025

run_network_hooks("stop", interfaces_hooks != NULL ?

3026

interfaces_hooks : "", delay);

3027

3028

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

3029

{

3030

char *interface = NULL;

3031

while((interface = argz_next(interfaces_to_take_down,

3032

interfaces_to_take_down_size,

3033

interface))){

3034

ret = take_down_interface(interface);

3035

if(ret != 0){

3036

errno = ret;

3037

perror_plus("Failed to take down interface");

3038

}

3039

}

3040

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

3041

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

3042

" down\n");

3043

}

3044

}

3045

}

3046

3047

ret = lower_privileges_permanently();

3048

if(ret != 0){

3049

errno = ret;

3050

perror_plus("Failed to lower privileges permanently");

3051

}

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2463

}

2464

}

2465

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

2466

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

2467

" down\n");

2468

}

2469

}

2470

2471

lower_privileges_permanently();

3052

2472

}

3053

2473

3054

2474

free(interfaces_to_take_down);

3055

2475

free(interfaces_hooks);

3056

2476

3057

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

3058

uintmax_t level){

2477

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

2478

if(tempdir_created){

3059

2479

struct dirent **direntries = NULL;

3060

int dret;

3061

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

3062

O_RDONLY

3063

| O_NOFOLLOW

3064

| O_DIRECTORY

3065

| O_PATH));

3066

if(dir_fd == -1){

3067

perror_plus("open");

3068

return;

3069

}

3070

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

3071

notdotentries, alphasort);

3072

if(numentries >= 0){

2480

struct dirent *direntry = NULL;

2481

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

2482

alphasort);

2483

if (numentries > 0){

3073

2484

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

3074

if(debug){

3075

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

3076

dirname, direntries[i]->d_name);

3077

}

3078

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

3079

if(dret == -1){

3080

if(errno == EISDIR){

3081

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

3082

AT_REMOVEDIR);

3083

}

3084

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

3085

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

3086

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

3087

/* Recurse only in this special case */

3088

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

3089

dret = 0;

3090

}

3091

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

3092

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

3093

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

3094

}

3095

}

3096

free(direntries[i]);

3097

}

3098

3099

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

3100

free(direntries);

3101

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3102

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

3103

perror_plus("rmdir");

3104

}

3105

} else {

3106

perror_plus("scandirat");

3107

}

3108

close(dir_fd);

3109

}

3110

3111

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

3112

if(tempdir != NULL){

3113

clean_dir_at(-1, tempdir, 0);

2485

direntry = direntries[i];

2486

char *fullname = NULL;

2487

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

2488

direntry->d_name);

2489

if(ret < 0){

2490

perror_plus("asprintf");

2491

continue;

2492

}

2493

ret = remove(fullname);

2494

if(ret == -1){

2495

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

2496

strerror(errno));

2497

}

2498

free(fullname);

2499

}

2500

}

2501

2502

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

2503

free(direntries);

2504

if (numentries == -1){

2505

perror_plus("scandir");

2506

}

2507

ret = rmdir(tempdir);

2508

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

2509

perror_plus("rmdir");

2510

}

3114

2511

}

3115

2512

3116

2513

if(quit_now){