/mandos/release : revision 237.7.420

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

42

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

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

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

45

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

46

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

47

strtof(), abort() */

48

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

49

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

50

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

49

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

50

asprintf(), strncpy(), strsignal()

51

*/

51

52

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

52

53

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

53

54

sockaddr_in6, PF_INET6,

55

56

opendir(), DIR */

56

57

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

57

58

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

58

inet_pton(), connect() */

59

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

59

inet_pton(), connect(),

60

getnameinfo() */

61

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

60

62

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

61

63

*/

62

64

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

63

65

strtoimax() */

64

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

66

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

67

EAI_SYSTEM, ENETUNREACH,

68

EHOSTUNREACH, ECONNREFUSED, EPROTO,

69

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

70

ENOTEMPTY,

65

71

program_invocation_short_name */

66

72

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

67

73

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

72

78

*/

73

79

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

74

80

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

75

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

76

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

81

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

82

unlinkat() */

83

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

77

84

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

78

85

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

79

86

argp_state, struct argp,

91

98

argz_delete(), argz_append(),

92

99

argz_stringify(), argz_add(),

93

100

argz_count() */

101

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

102

EAI_SYSTEM, gai_strerror() */

94

103

95

104

#ifdef __linux__

96

105

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

138

147

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

139

148

char *connect_to = NULL;

140

149

const char *hookdir = HOOKDIR;

150

int hookdir_fd = -1;

141

151

uid_t uid = 65534;

142

152

gid_t gid = 65534;

143

153

180

190

perror(print_text);

181

191

}

182

192

183

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

193

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

184

194

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

185

195

va_list ap;

186

196

va_start (ap, format);

195

205

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

196

206

* "buffer_length" is how much is already used.

197

207

*/

208

__attribute__((nonnull, warn_unused_result))

198

209

size_t incbuffer(char **buffer, size_t buffer_length,

199

210

size_t buffer_capacity){

200

211

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

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

202

if(buffer == NULL){

212

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

213

if(new_buf == NULL){

214

int old_errno = errno;

215

free(*buffer);

216

errno = old_errno;

217

*buffer = NULL;

203

218

return 0;

204

219

}

220

*buffer = new_buf;

205

221

buffer_capacity += BUFFER_SIZE;

206

222

}

207

223

return buffer_capacity;

208

224

}

209

225

210

226

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

227

__attribute__((nonnull, warn_unused_result))

211

228

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

212

229

int af, server **current_server){

213

230

int ret;

222

239

.af = af };

223

240

if(new_server->ip == NULL){

224

241

perror_plus("strdup");

242

free(new_server);

243

return false;

244

}

245

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

246

if(ret == -1){

247

perror_plus("clock_gettime");

248

#ifdef __GNUC__

249

#pragma GCC diagnostic push

250

#pragma GCC diagnostic ignored "-Wcast-qual"

251

#endif

252

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

253

#ifdef __GNUC__

254

#pragma GCC diagnostic pop

255

#endif

256

free(new_server);

225

257

return false;

226

258

}

227

259

/* Special case of first server */

229

261

new_server->next = new_server;

230

262

new_server->prev = new_server;

231

263

*current_server = new_server;

232

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

233

264

} else {

265

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

234

266

new_server->next = *current_server;

235

267

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

236

268

new_server->prev->next = new_server;

237

269

(*current_server)->prev = new_server;

238

270

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

271

return true;

245

272

}

246

273

247

274

/*

248

275

* Initialize GPGME.

249

276

*/

250

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

251

const char *tempdir, mandos_context *mc){

277

__attribute__((nonnull, warn_unused_result))

278

static bool init_gpgme(const char * const seckey,

279

const char * const pubkey,

280

const char * const tempdir,

281

mandos_context *mc){

252

282

gpgme_error_t rc;

253

283

gpgme_engine_info_t engine_info;

254

284

255

285

/*

256

286

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

257

287

*/

258

bool import_key(const char *filename){

288

bool import_key(const char * const filename){

259

289

int ret;

260

290

int fd;

261

291

gpgme_data_t pgp_data;

280

310

return false;

281

311

}

282

312

283

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

313

ret = close(fd);

284

314

if(ret == -1){

285

315

perror_plus("close");

286

316

}

342

372

* Decrypt OpenPGP data.

343

373

* Returns -1 on error

344

374

*/

375

__attribute__((nonnull, warn_unused_result))

345

376

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

377

size_t crypto_size,

347

378

char **plaintext,

467

498

return plaintext_length;

468

499

}

469

500

470

static const char * safer_gnutls_strerror(int value){

501

__attribute__((warn_unused_result, const))

502

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

503

if(str == NULL)

504

return "(unknown)";

505

return str;

506

}

507

508

__attribute__((warn_unused_result))

509

static const char *safer_gnutls_strerror(int value){

471

510

const char *ret = gnutls_strerror(value);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

511

return safe_string(ret);

475

512

}

476

513

477

514

/* GnuTLS log function callback */

515

__attribute__((nonnull))

478

516

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

479

517

const char* string){

480

518

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

481

519

}

482

520

521

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

483

522

static int init_gnutls_global(const char *pubkeyfilename,

484

523

const char *seckeyfilename,

524

const char *dhparamsfilename,

485

525

mandos_context *mc){

486

526

int ret;

527

unsigned int uret;

487

528

488

529

if(debug){

489

530

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

490

531

}

491

532

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

533

if(debug){

500

534

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

501

535

* - GnuTLS manual

509

543

if(ret != GNUTLS_E_SUCCESS){

510

544

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

511

545

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

513

546

return -1;

514

547

}

515

548

540

573

safer_gnutls_strerror(ret));

541

574

goto globalfail;

542

575

}

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

576

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

577

if(dhparamsfilename != NULL){

578

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

579

do {

580

int dhpfile = open(dhparamsfilename, O_RDONLY);

581

if(dhpfile == -1){

582

perror_plus("open");

583

dhparamsfilename = NULL;

584

break;

585

}

586

size_t params_capacity = 0;

587

while(true){

588

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

589

(size_t)params.size,

590

(size_t)params_capacity);

591

if(params_capacity == 0){

592

perror_plus("incbuffer");

593

free(params.data);

594

params.data = NULL;

595

dhparamsfilename = NULL;

596

break;

597

}

598

ssize_t bytes_read = read(dhpfile,

599

params.data + params.size,

600

BUFFER_SIZE);

601

/* EOF */

602

if(bytes_read == 0){

603

break;

604

}

605

/* check bytes_read for failure */

606

if(bytes_read < 0){

607

perror_plus("read");

608

free(params.data);

609

params.data = NULL;

610

dhparamsfilename = NULL;

611

break;

612

}

613

params.size += (unsigned int)bytes_read;

614

}

615

if(params.data == NULL){

616

dhparamsfilename = NULL;

617

}

618

if(dhparamsfilename == NULL){

619

break;

620

}

621

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

622

GNUTLS_X509_FMT_PEM);

623

if(ret != GNUTLS_E_SUCCESS){

624

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

625

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

626

safer_gnutls_strerror(ret));

627

dhparamsfilename = NULL;

628

}

629

} while(false);

630

}

631

if(dhparamsfilename == NULL){

632

if(mc->dh_bits == 0){

633

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

634

/* Try to read the private key file */

635

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

636

do {

637

int secfile = open(seckeyfilename, O_RDONLY);

638

if(secfile == -1){

639

perror_plus("open");

640

break;

641

}

642

size_t buffer_capacity = 0;

643

while(true){

644

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

645

(size_t)buffer.size,

646

(size_t)buffer_capacity);

647

if(buffer_capacity == 0){

648

perror_plus("incbuffer");

649

free(buffer.data);

650

buffer.data = NULL;

651

break;

652

}

653

ssize_t bytes_read = read(secfile,

654

buffer.data + buffer.size,

655

BUFFER_SIZE);

656

/* EOF */

657

if(bytes_read == 0){

658

break;

659

}

660

/* check bytes_read for failure */

661

if(bytes_read < 0){

662

perror_plus("read");

663

free(buffer.data);

664

buffer.data = NULL;

665

break;

666

}

667

buffer.size += (unsigned int)bytes_read;

668

}

669

close(secfile);

670

} while(false);

671

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

672

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

673

if(buffer.data != NULL){

674

{

675

gnutls_openpgp_privkey_t privkey = NULL;

676

ret = gnutls_openpgp_privkey_init(&privkey);

677

if(ret != GNUTLS_E_SUCCESS){

678

fprintf_plus(stderr, "Error initializing OpenPGP key"

679

" structure: %s",

680

safer_gnutls_strerror(ret));

681

free(buffer.data);

682

buffer.data = NULL;

683

} else {

684

ret = gnutls_openpgp_privkey_import

685

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

686

if(ret != GNUTLS_E_SUCCESS){

687

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

688

safer_gnutls_strerror(ret));

689

privkey = NULL;

690

}

691

free(buffer.data);

692

buffer.data = NULL;

693

if(privkey != NULL){

694

/* Use private key to suggest an appropriate

695

sec_param */

696

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

697

gnutls_openpgp_privkey_deinit(privkey);

698

if(debug){

699

fprintf_plus(stderr, "This OpenPGP key implies using"

700

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

701

safe_string(gnutls_sec_param_get_name

702

(sec_param)));

703

}

704

}

705

}

706

}

707

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

708

/* Err on the side of caution */

709

sec_param = GNUTLS_SEC_PARAM_ULTRA;

710

if(debug){

711

fprintf_plus(stderr, "Falling back to security parameter"

712

" \"%s\"\n",

713

safe_string(gnutls_sec_param_get_name

714

(sec_param)));

715

}

716

}

717

}

718

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

719

if(uret != 0){

720

mc->dh_bits = uret;

721

if(debug){

722

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

723

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

724

safe_string(gnutls_sec_param_get_name

725

(sec_param)),

726

mc->dh_bits);

727

}

728

} else {

729

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

730

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

731

safe_string(gnutls_sec_param_get_name

732

(sec_param)),

733

safer_gnutls_strerror(ret));

734

goto globalfail;

735

}

736

} else if(debug){

737

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

738

mc->dh_bits);

739

}

740

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

741

if(ret != GNUTLS_E_SUCCESS){

742

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

743

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

744

safer_gnutls_strerror(ret));

745

goto globalfail;

746

}

747

}

550

748

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

551

749

552

750

return 0;

554

752

globalfail:

555

753

556

754

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

558

755

gnutls_dh_params_deinit(mc->dh_params);

559

756

return -1;

560

757

}

561

758

759

__attribute__((nonnull, warn_unused_result))

562

760

static int init_gnutls_session(gnutls_session_t *session,

563

761

mandos_context *mc){

564

762

int ret;

611

809

/* ignore client certificate if any. */

612

810

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

811

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

616

812

return 0;

617

813

}

618

814

620

816

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

621

817

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

622

818

819

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

820

__attribute__((warn_unused_result))

821

int raise_privileges(void){

822

int old_errno = errno;

823

int ret = 0;

824

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

825

ret = errno;

826

}

827

errno = old_errno;

828

return ret;

829

}

830

831

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

832

__attribute__((warn_unused_result))

833

int raise_privileges_permanently(void){

834

int old_errno = errno;

835

int ret = raise_privileges();

836

if(ret != 0){

837

errno = old_errno;

838

return ret;

839

}

840

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

841

ret = errno;

842

}

843

errno = old_errno;

844

return ret;

845

}

846

847

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

848

__attribute__((warn_unused_result))

849

int lower_privileges(void){

850

int old_errno = errno;

851

int ret = 0;

852

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

853

ret = errno;

854

}

855

errno = old_errno;

856

return ret;

857

}

858

859

/* Lower privileges permanently */

860

__attribute__((warn_unused_result))

861

int lower_privileges_permanently(void){

862

int old_errno = errno;

863

int ret = 0;

864

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

865

ret = errno;

866

}

867

errno = old_errno;

868

return ret;

869

}

870

871

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

872

__attribute__((nonnull, warn_unused_result))

873

static bool add_delete_local_route(const bool add,

874

const char *address,

875

AvahiIfIndex if_index){

876

int ret;

877

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

878

char add_arg[] = "add";

879

char delete_arg[] = "delete";

880

char debug_flag[] = "--debug";

881

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

882

if(pluginhelperdir == NULL){

883

if(debug){

884

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

885

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

886

}

887

return false;

888

}

889

890

char interface[IF_NAMESIZE];

891

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

892

perror_plus("if_indextoname");

893

return false;

894

}

895

896

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

897

if(devnull == -1){

898

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

899

return false;

900

}

901

pid_t pid = fork();

902

if(pid == 0){

903

/* Child */

904

/* Raise privileges */

905

errno = raise_privileges_permanently();

906

if(errno != 0){

907

perror_plus("Failed to raise privileges");

908

/* _exit(EX_NOPERM); */

909

} else {

910

/* Set group */

911

errno = 0;

912

ret = setgid(0);

913

if(ret == -1){

914

perror_plus("setgid");

915

_exit(EX_NOPERM);

916

}

917

/* Reset supplementary groups */

918

errno = 0;

919

ret = setgroups(0, NULL);

920

if(ret == -1){

921

perror_plus("setgroups");

922

_exit(EX_NOPERM);

923

}

924

}

925

ret = dup2(devnull, STDIN_FILENO);

926

if(ret == -1){

927

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

928

_exit(EX_OSERR);

929

}

930

ret = close(devnull);

931

if(ret == -1){

932

perror_plus("close");

933

_exit(EX_OSERR);

934

}

935

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

936

if(ret == -1){

937

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

938

_exit(EX_OSERR);

939

}

940

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

941

O_RDONLY

942

| O_DIRECTORY

943

| O_PATH

944

| O_CLOEXEC));

945

if(helperdir_fd == -1){

946

perror_plus("open");

947

_exit(EX_UNAVAILABLE);

948

}

949

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

950

helper, O_RDONLY));

951

if(helper_fd == -1){

952

perror_plus("openat");

953

close(helperdir_fd);

954

_exit(EX_UNAVAILABLE);

955

}

956

close(helperdir_fd);

957

#ifdef __GNUC__

958

#pragma GCC diagnostic push

959

#pragma GCC diagnostic ignored "-Wcast-qual"

960

#endif

961

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

962

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

963

interface, debug ? debug_flag : NULL, NULL },

964

environ) == -1){

965

#ifdef __GNUC__

966

#pragma GCC diagnostic pop

967

#endif

968

perror_plus("fexecve");

969

_exit(EXIT_FAILURE);

970

}

971

}

972

if(pid == -1){

973

perror_plus("fork");

974

return false;

975

}

976

int status;

977

pid_t pret = -1;

978

errno = 0;

979

do {

980

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

981

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

982

int errno_raising = 0;

983

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

984

errno_raising = errno;

985

perror_plus("Failed to raise privileges in order to"

986

" kill helper program");

987

}

988

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

989

perror_plus("kill");

990

}

991

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

992

perror_plus("Failed to lower privileges after killing"

993

" helper program");

994

}

995

return false;

996

}

997

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

998

if(pret == -1){

999

perror_plus("waitpid");

1000

return false;

1001

}

1002

if(WIFEXITED(status)){

1003

if(WEXITSTATUS(status) != 0){

1004

fprintf_plus(stderr, "Error: iprouteadddel exited"

1005

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

1006

return false;

1007

}

1008

return true;

1009

}

1010

if(WIFSIGNALED(status)){

1011

fprintf_plus(stderr, "Error: iprouteadddel died by"

1012

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

1013

return false;

1014

}

1015

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

1016

return false;

1017

}

1018

1019

__attribute__((nonnull, warn_unused_result))

1020

static bool add_local_route(const char *address,

1021

AvahiIfIndex if_index){

1022

if(debug){

1023

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

1024

}

1025

return add_delete_local_route(true, address, if_index);

1026

}

1027

1028

__attribute__((nonnull, warn_unused_result))

1029

static bool delete_local_route(const char *address,

1030

AvahiIfIndex if_index){

1031

if(debug){

1032

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

1033

}

1034

return add_delete_local_route(false, address, if_index);

1035

}

1036

623

1037

/* Called when a Mandos server is found */

1038

__attribute__((nonnull, warn_unused_result))

624

1039

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

625

1040

AvahiIfIndex if_index,

626

1041

int af, mandos_context *mc){

627

1042

int ret, tcp_sd = -1;

628

1043

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1044

struct sockaddr_storage to;

633

1045

char *buffer = NULL;

634

1046

char *decrypted_buffer = NULL;

635

1047

size_t buffer_length = 0;

638

1050

int retval = -1;

639

1051

gnutls_session_t session;

640

1052

int pf; /* Protocol family */

1053

bool route_added = false;

641

1054

642

1055

errno = 0;

643

1056

701

1114

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

702

1115

}

703

1116

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

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

705

1118

if(tcp_sd < 0){

706

1119

int e = errno;

707

1120

perror_plus("socket");

714

1127

goto mandos_end;

715

1128

}

716

1129

717

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

718

1130

if(af == AF_INET6){

719

to.in6.sin6_family = (sa_family_t)af;

720

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

1131

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

1132

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

1133

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

721

1134

} else { /* IPv4 */

722

to.in.sin_family = (sa_family_t)af;

723

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

1135

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

1136

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

1137

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

724

1138

}

725

1139

if(ret < 0 ){

726

1140

int e = errno;

735

1149

goto mandos_end;

736

1150

}

737

1151

if(af == AF_INET6){

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*/

1152

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

1153

if(IN6_IS_ADDR_LINKLOCAL

1154

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

742

1155

if(if_index == AVAHI_IF_UNSPEC){

743

1156

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

744

1157

" incomplete without a network interface\n");

746

1159

goto mandos_end;

747

1160

}

748

1161

/* Set the network interface number as scope */

749

to.in6.sin6_scope_id = (uint32_t)if_index;

1162

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

750

1163

}

751

1164

} else {

752

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

753

-Wconversion and

754

-Wunreachable-code */

1165

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

755

1166

}

756

1167

757

1168

if(quit_now){

774

1185

}

775

1186

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

1187

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

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;

1188

if(af == AF_INET6){

1189

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

1190

sizeof(struct sockaddr_in6),

1191

addrstr, sizeof(addrstr), NULL, 0,

1192

NI_NUMERICHOST);

1193

} else {

1194

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

1195

sizeof(struct sockaddr_in),

1196

addrstr, sizeof(addrstr), NULL, 0,

1197

NI_NUMERICHOST);

1198

}

1199

if(ret == EAI_SYSTEM){

1200

perror_plus("getnameinfo");

1201

} else if(ret != 0) {

1202

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

1203

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

1204

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

1205

}

1206

}

1207

1208

if(quit_now){

1209

errno = EINTR;

1210

goto mandos_end;

1211

}

1212

1213

while(true){

1214

if(af == AF_INET6){

1215

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

1216

sizeof(struct sockaddr_in6));

1217

} else {

1218

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

1219

sizeof(struct sockaddr_in));

1220

}

1221

if(ret < 0){

1222

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

1223

and if_index != AVAHI_IF_UNSPEC

1224

and connect_to == NULL

1225

and not route_added and

1226

((af == AF_INET6 and not

1227

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1228

&to)->sin6_addr)))

1229

or (af == AF_INET and

1230

/* Not a a IPv4LL address */

1231

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

1232

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

1233

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

1234

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

1235

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

1236

connect to a Mandos server announced by Avahi on a server

1237

host with a global address. Work around this by retrying

1238

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

1239

1240

Avahi bug reference:

1241

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

1242

https://bugs.debian.org/587961

1243

*/

1244

if(debug){

1245

fprintf_plus(stderr, "Mandos server unreachable, trying"

1246

" direct route\n");

1247

}

1248

int e = errno;

1249

route_added = add_local_route(ip, if_index);

1250

if(route_added){

1251

continue;

1252

}

1253

errno = e;

1254

}

1255

if(errno != ECONNREFUSED or debug){

1256

int e = errno;

1257

perror_plus("connect");

1258

errno = e;

1259

}

1260

goto mandos_end;

1261

}

1262

1263

if(quit_now){

1264

errno = EINTR;

1265

goto mandos_end;

1266

}

1267

break;

816

1268

}

817

1269

818

1270

const char *out = mandos_protocol_version;

972

1424

&decrypted_buffer, mc);

973

1425

if(decrypted_buffer_size >= 0){

974

1426

1427

clearerr(stdout);

975

1428

written = 0;

976

1429

while(written < (size_t) decrypted_buffer_size){

977

1430

if(quit_now){

993

1446

}

994

1447

written += (size_t)ret;

995

1448

}

1449

ret = fflush(stdout);

1450

if(ret != 0){

1451

int e = errno;

1452

if(debug){

1453

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

1454

strerror(errno));

1455

}

1456

errno = e;

1457

goto mandos_end;

1458

}

996

1459

retval = 0;

997

1460

}

998

1461

}

1001

1464

1002

1465

mandos_end:

1003

1466

{

1467

if(route_added){

1468

if(not delete_local_route(ip, if_index)){

1469

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

1470

" interface %d", ip, if_index);

1471

}

1472

}

1004

1473

int e = errno;

1005

1474

free(decrypted_buffer);

1006

1475

free(buffer);

1007

1476

if(tcp_sd >= 0){

1008

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

1477

ret = close(tcp_sd);

1009

1478

}

1010

1479

if(ret == -1){

1011

1480

if(e == 0){

1023

1492

return retval;

1024

1493

}

1025

1494

1495

__attribute__((nonnull))

1026

1496

static void resolve_callback(AvahiSServiceResolver *r,

1027

1497

AvahiIfIndex interface,

1028

1498

AvahiProtocol proto,

1036

1506

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

1507

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

1508

flags,

1039

void* mc){

1509

void *mc){

1040

1510

if(r == NULL){

1041

1511

return;

1042

1512

}

1045

1515

timed out */

1046

1516

1047

1517

if(quit_now){

1518

avahi_s_service_resolver_free(r);

1048

1519

return;

1049

1520

}

1050

1521

1095

1566

const char *domain,

1096

1567

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1568

flags,

1098

void* mc){

1569

void *mc){

1099

1570

if(b == NULL){

1100

1571

return;

1101

1572

}

1161

1632

errno = old_errno;

1162

1633

}

1163

1634

1635

__attribute__((nonnull, warn_unused_result))

1164

1636

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

1165

1637

int ret;

1166

error_t ret_errno;

1638

int old_errno;

1167

1639

1168

1640

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

1169

1641

if(s < 0){

1170

ret_errno = errno;

1642

old_errno = errno;

1171

1643

perror_plus("socket");

1172

errno = ret_errno;

1644

errno = old_errno;

1173

1645

return false;

1174

1646

}

1175

strcpy(ifr->ifr_name, ifname);

1647

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

1648

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

1176

1649

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

1650

if(ret == -1){

1178

1651

if(debug){

1179

ret_errno = errno;

1652

old_errno = errno;

1180

1653

perror_plus("ioctl SIOCGIFFLAGS");

1181

errno = ret_errno;

1654

errno = old_errno;

1182

1655

}

1183

1656

return false;

1184

1657

}

1185

1658

return true;

1186

1659

}

1187

1660

1661

__attribute__((nonnull, warn_unused_result))

1188

1662

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

1189

1663

1190

1664

/* Reject the loopback device */

1232

1706

* corresponds to an acceptable network device.

1233

1707

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

1234

1708

*/

1709

__attribute__((nonnull, warn_unused_result))

1235

1710

int good_interface(const struct dirent *if_entry){

1236

1711

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

1237

1712

return 0;

1255

1730

/*

1256

1731

* This function determines if a network interface is up.

1257

1732

*/

1733

__attribute__((nonnull, warn_unused_result))

1258

1734

bool interface_is_up(const char *interface){

1259

1735

struct ifreq ifr;

1260

1736

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

1271

1747

/*

1272

1748

* This function determines if a network interface is running

1273

1749

*/

1750

__attribute__((nonnull, warn_unused_result))

1274

1751

bool interface_is_running(const char *interface){

1275

1752

struct ifreq ifr;

1276

1753

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

1284

1761

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

1285

1762

}

1286

1763

1764

__attribute__((nonnull, pure, warn_unused_result))

1287

1765

int notdotentries(const struct dirent *direntry){

1288

1766

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

1289

1767

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

1296

1774

}

1297

1775

1298

1776

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

1777

__attribute__((nonnull, warn_unused_result))

1299

1778

int runnable_hook(const struct dirent *direntry){

1300

1779

int ret;

1301

1780

size_t sret;

1309

1788

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

1310

1789

"abcdefghijklmnopqrstuvwxyz"

1311

1790

"0123456789"

1312

"_-");

1791

"_.-");

1313

1792

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

1314

1793

/* Contains non-allowed characters */

1315

1794

if(debug){

1319

1798

return 0;

1320

1799

}

1321

1800

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);

1801

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

1330

1802

if(ret == -1){

1331

1803

if(debug){

1332

1804

perror_plus("Could not stat hook");

1356

1828

return 1;

1357

1829

}

1358

1830

1831

__attribute__((nonnull, warn_unused_result))

1359

1832

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

1833

mandos_context *mc){

1361

1834

int ret;

1365

1838

1366

1839

while(true){

1367

1840

if(mc->current_server == NULL){

1368

if (debug){

1841

if(debug){

1369

1842

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

1370

1843

" No timeout!\n");

1371

1844

}

1372

1845

ret = avahi_simple_poll_iterate(s, -1);

1373

1846

} else {

1374

if (debug){

1847

if(debug){

1375

1848

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

1376

1849

" it, or wait\n");

1377

1850

}

1394

1867

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

1395

1868

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

1396

1869

1397

if (debug){

1870

if(debug){

1398

1871

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

1399

1872

block_time);

1400

1873

}

1422

1895

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

1423

1896

}

1424

1897

if(ret != 0){

1425

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

1898

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

1426

1899

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

1427

1900

}

1428

1901

}

1429

1902

}

1430

1903

}

1431

1904

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,

1905

__attribute__((nonnull))

1906

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

1485

1907

const float delay){

1486

struct dirent **direntries;

1908

struct dirent **direntries = NULL;

1909

if(hookdir_fd == -1){

1910

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1911

| O_CLOEXEC);

1912

if(hookdir_fd == -1){

1913

if(errno == ENOENT){

1914

if(debug){

1915

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

1916

" found\n", hookdir);

1917

}

1918

} else {

1919

perror_plus("open");

1920

}

1921

return;

1922

}

1923

}

1924

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

1925

runnable_hook, alphasort);

1926

if(numhooks == -1){

1927

perror_plus("scandir");

1928

return;

1929

}

1487

1930

struct dirent *direntry;

1488

1931

int ret;

1489

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

1490

alphasort);

1491

if(numhooks == -1){

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");

1932

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

1933

if(devnull == -1){

1934

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

1935

return;

1936

}

1937

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

1938

direntry = direntries[i];

1939

if(debug){

1940

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

1941

direntry->d_name);

1499

1942

}

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){

1943

pid_t hook_pid = fork();

1944

if(hook_pid == 0){

1945

/* Child */

1946

/* Raise privileges */

1947

errno = raise_privileges_permanently();

1948

if(errno != 0){

1949

perror_plus("Failed to raise privileges");

1950

_exit(EX_NOPERM);

1951

}

1952

/* Set group */

1953

errno = 0;

1954

ret = setgid(0);

1955

if(ret == -1){

1956

perror_plus("setgid");

1957

_exit(EX_NOPERM);

1958

}

1959

/* Reset supplementary groups */

1960

errno = 0;

1961

ret = setgroups(0, NULL);

1962

if(ret == -1){

1963

perror_plus("setgroups");

1964

_exit(EX_NOPERM);

1965

}

1966

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

1967

if(ret == -1){

1968

perror_plus("setenv");

1969

_exit(EX_OSERR);

1970

}

1971

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

1972

if(ret == -1){

1973

perror_plus("setenv");

1974

_exit(EX_OSERR);

1975

}

1976

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

1977

if(ret == -1){

1978

perror_plus("setenv");

1979

_exit(EX_OSERR);

1980

}

1981

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

1982

if(ret == -1){

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

char *delaystring;

1987

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

1988

if(ret == -1){

1507

1989

perror_plus("asprintf");

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

}

1990

_exit(EX_OSERR);

1991

}

1992

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

1993

if(ret == -1){

1566

1994

free(delaystring);

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

}

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

free(delaystring);

1999

if(connect_to != NULL){

2000

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

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

}

2006

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

2007

direntry->d_name,

2008

O_RDONLY));

2009

if(hook_fd == -1){

2010

perror_plus("openat");

2011

_exit(EXIT_FAILURE);

2012

}

2013

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

2014

perror_plus("close");

2015

_exit(EXIT_FAILURE);

2016

}

2017

ret = dup2(devnull, STDIN_FILENO);

2018

if(ret == -1){

2019

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

2020

_exit(EX_OSERR);

2021

}

2022

ret = close(devnull);

2023

if(ret == -1){

2024

perror_plus("close");

2025

_exit(EX_OSERR);

2026

}

2027

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2028

if(ret == -1){

2029

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

2030

_exit(EX_OSERR);

2031

}

2032

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

2033

environ) == -1){

2034

perror_plus("fexecve");

2035

_exit(EXIT_FAILURE);

2036

}

2037

} else {

2038

if(hook_pid == -1){

2039

perror_plus("fork");

2040

free(direntry);

2041

continue;

2042

}

2043

int status;

2044

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

2045

perror_plus("waitpid");

2046

free(direntry);

2047

continue;

2048

}

2049

if(WIFEXITED(status)){

2050

if(WEXITSTATUS(status) != 0){

2051

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

2052

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

2053

WEXITSTATUS(status));

2054

free(direntry);

2055

continue;

2056

}

2057

} else if(WIFSIGNALED(status)){

2058

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

2059

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

2060

WTERMSIG(status));

2061

free(direntry);

2062

continue;

1578

2063

} else {

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;

2064

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

2065

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

2066

free(direntry);

2067

continue;

2068

}

2069

}

2070

if(debug){

2071

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

2072

direntry->d_name);

2073

}

2074

free(direntry);

2075

}

2076

free(direntries);

2077

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

2078

perror_plus("close");

2079

} else {

2080

hookdir_fd = -1;

2081

}

2082

close(devnull);

1615

2083

}

1616

2084

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;

2085

__attribute__((nonnull, warn_unused_result))

2086

int bring_up_interface(const char *const interface,

2087

const float delay){

2088

int old_errno = errno;

2089

int ret;

1623

2090

struct ifreq network;

1624

2091

unsigned int if_index = if_nametoindex(interface);

1625

2092

if(if_index == 0){

1634

2101

}

1635

2102

1636

2103

if(not interface_is_up(interface)){

1637

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

2104

int ret_errno = 0;

2105

int ioctl_errno = 0;

2106

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

1638

2107

ret_errno = errno;

1639

2108

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

1640

2109

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

2110

errno = old_errno;

1641

2111

return ret_errno;

1642

2112

}

1643

network.ifr_flags |= IFF_UP;

2113

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

1644

2114

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

2115

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

2116

if(sd == -1){

1647

2117

ret_errno = errno;

1648

2118

perror_plus("socket");

1649

2119

errno = old_errno;

1650

2120

return ret_errno;

1651

2121

}

1652

2122

1653

2123

if(quit_now){

1654

close(sd);

2124

ret = close(sd);

2125

if(ret == -1){

2126

perror_plus("close");

2127

}

1655

2128

errno = old_errno;

1656

2129

return EINTR;

1657

2130

}

1661

2134

interface);

1662

2135

}

1663

2136

1664

/* Raise priviliges */

1665

raise_privileges();

2137

/* Raise privileges */

2138

ret_errno = raise_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to raise privileges");

2142

}

1666

2143

1667

2144

#ifdef __linux__

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");

2145

int ret_linux;

2146

bool restore_loglevel = false;

2147

if(ret_errno == 0){

2148

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2149

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

2150

ret_linux = klogctl(8, NULL, 5);

2151

if(ret_linux == -1){

2152

perror_plus("klogctl");

2153

} else {

2154

restore_loglevel = true;

2155

}

1675

2156

}

1676

2157

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

2158

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

2159

ioctl_errno = errno;

1679

2160

#ifdef __linux__

1680

2161

if(restore_loglevel){

1681

2162

ret_linux = klogctl(7, NULL, 0);

1685

2166

}

1686

2167

#endif /* __linux__ */

1687

2168

1688

/* Lower privileges */

1689

lower_privileges();

2169

/* If raise_privileges() succeeded above */

2170

if(ret_errno == 0){

2171

/* Lower privileges */

2172

ret_errno = lower_privileges();

2173

if(ret_errno != 0){

2174

errno = ret_errno;

2175

perror_plus("Failed to lower privileges");

2176

}

2177

}

1690

2178

1691

2179

/* Close the socket */

1692

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

2180

ret = close(sd);

1693

2181

if(ret == -1){

1694

2182

perror_plus("close");

1695

2183

}

1696

2184

1697

2185

if(ret_setflags == -1){

1698

errno = ret_errno;

2186

errno = ioctl_errno;

1699

2187

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

2188

errno = old_errno;

1701

return ret_errno;

2189

return ioctl_errno;

1702

2190

}

1703

2191

} else if(debug){

1704

2192

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

1722

2210

return 0;

1723

2211

}

1724

2212

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;

2213

__attribute__((nonnull, warn_unused_result))

2214

int take_down_interface(const char *const interface){

2215

int old_errno = errno;

1730

2216

struct ifreq network;

1731

2217

unsigned int if_index = if_nametoindex(interface);

1732

2218

if(if_index == 0){

1735

2221

return ENXIO;

1736

2222

}

1737

2223

if(interface_is_up(interface)){

2224

int ret_errno = 0;

2225

int ioctl_errno = 0;

1738

2226

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

1739

2227

ret_errno = errno;

1740

2228

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

1741

2229

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

2230

errno = old_errno;

1742

2231

return ret_errno;

1743

2232

}

1744

2233

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

1745

2234

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

2235

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

2236

if(sd == -1){

1748

2237

ret_errno = errno;

1749

2238

perror_plus("socket");

1750

2239

errno = old_errno;

1756

2245

interface);

1757

2246

}

1758

2247

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();

2248

/* Raise privileges */

2249

ret_errno = raise_privileges();

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("Failed to raise privileges");

2253

}

2254

2255

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

2256

ioctl_errno = errno;

2257

2258

/* If raise_privileges() succeeded above */

2259

if(ret_errno == 0){

2260

/* Lower privileges */

2261

ret_errno = lower_privileges();

2262

if(ret_errno != 0){

2263

errno = ret_errno;

2264

perror_plus("Failed to lower privileges");

2265

}

2266

}

1767

2267

1768

2268

/* Close the socket */

1769

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

2269

int ret = close(sd);

1770

2270

if(ret == -1){

1771

2271

perror_plus("close");

1772

2272

}

1773

2273

1774

2274

if(ret_setflags == -1){

1775

errno = ret_errno;

2275

errno = ioctl_errno;

1776

2276

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

2277

errno = old_errno;

1778

return ret_errno;

2278

return ioctl_errno;

1779

2279

}

1780

2280

} else if(debug){

1781

2281

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

1787

2287

}

1788

2288

1789

2289

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

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 };

2290

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

2291

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

2292

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

2293

.current_server = NULL, .interfaces = NULL,

2294

.interfaces_size = 0 };

1794

2295

AvahiSServiceBrowser *sb = NULL;

1795

2296

error_t ret_errno;

1796

2297

int ret;

1799

2300

int exitcode = EXIT_SUCCESS;

1800

2301

char *interfaces_to_take_down = NULL;

1801

2302

size_t interfaces_to_take_down_size = 0;

1802

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

1803

bool tempdir_created = false;

2303

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

2304

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

2305

char *tempdir = NULL;

1804

2306

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

2307

const char *seckey = PATHDIR "/" SECKEY;

1806

2308

const char *pubkey = PATHDIR "/" PUBKEY;

2309

const char *dh_params_file = NULL;

1807

2310

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

2311

1810

2312

bool gnutls_initialized = false;

1811

2313

bool gpgme_initialized = false;

1863

2365

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

1864

2366

" Diffie-Hellman key exchange",

1865

2367

.group = 2 },

2368

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

2369

.arg = "FILE",

2370

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

2371

" for the Diffie-Hellman key exchange",

2372

.group = 2 },

1866

2373

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

1867

2374

.arg = "STRING",

1868

2375

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

1923

2430

}

1924

2431

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

1925

2432

break;

2433

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

2434

dh_params_file = arg;

2435

break;

1926

2436

case 130: /* --priority */

1927

2437

mc.priority = arg;

1928

2438

break;

1968

2478

.args_doc = "",

1969

2479

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

1970

2480

" passwords from a Mandos server" };

1971

ret = argp_parse(&argp, argc, argv,

1972

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1973

switch(ret){

2481

ret_errno = argp_parse(&argp, argc, argv,

2482

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2483

switch(ret_errno){

1974

2484

case 0:

1975

2485

break;

1976

2486

case ENOMEM:

1977

2487

default:

1978

errno = ret;

2488

errno = ret_errno;

1979

2489

perror_plus("argp_parse");

1980

2490

exitcode = EX_OSERR;

1981

2491

goto end;

1984

2494

goto end;

1985

2495

}

1986

2496

}

1987

2497

1988

2498

{

1989

2499

/* Work around Debian bug #633582:

1990

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

2500

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

1991

2501

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2502

/* Re-raise privileges */

2503

ret = raise_privileges();

2504

if(ret != 0){

2505

errno = ret;

2506

perror_plus("Failed to raise privileges");

2507

} else {

1994

2508

struct stat st;

1995

2509

1996

2510

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

2010

2524

}

2011

2525

}

2012

2526

}

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2527

close(seckey_fd);

2014

2528

}

2015

2529

}

2016

2530

2017

2531

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

2018

2532

int pubkey_fd = open(pubkey, O_RDONLY);

2019

2533

if(pubkey_fd == -1){

2031

2545

}

2032

2546

}

2033

2547

}

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2548

close(pubkey_fd);

2549

}

2550

}

2551

2552

if(dh_params_file != NULL

2553

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

2554

int dhparams_fd = open(dh_params_file, O_RDONLY);

2555

if(dhparams_fd == -1){

2556

perror_plus("open");

2557

} else {

2558

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

2559

if(ret == -1){

2560

perror_plus("fstat");

2561

} else {

2562

if(S_ISREG(st.st_mode)

2563

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

2564

ret = fchown(dhparams_fd, uid, gid);

2565

if(ret == -1){

2566

perror_plus("fchown");

2567

}

2568

}

2569

}

2570

close(dhparams_fd);

2571

}

2572

}

2573

2038

2574

/* Lower privileges */

2039

lower_privileges();

2575

ret = lower_privileges();

2576

if(ret != 0){

2577

errno = ret;

2578

perror_plus("Failed to lower privileges");

2579

}

2040

2580

}

2041

2581

}

2042

2582

2066

2606

goto end;

2067

2607

}

2068

2608

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

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

}

2609

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

2610

}

2611

run_network_hooks("start", interfaces_hooks != NULL ?

2612

interfaces_hooks : "", delay);

2077

2613

}

2078

2614

2079

2615

if(not debug){

2157

2693

2158

2694

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

2159

2695

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2696

struct dirent **direntries = NULL;

2161

2697

/* Look for any good interfaces */

2162

2698

ret = scandir(sys_class_net, &direntries, good_interface,

2163

2699

alphasort);

2167

2703

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

2168

2704

direntries[i]->d_name);

2169

2705

if(ret_errno != 0){

2706

errno = ret_errno;

2170

2707

perror_plus("argz_add");

2708

free(direntries[i]);

2171

2709

continue;

2172

2710

}

2173

2711

if(debug){

2174

2712

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

2175

2713

direntries[i]->d_name);

2176

2714

}

2715

free(direntries[i]);

2177

2716

}

2178

2717

free(direntries);

2179

2718

} else {

2180

free(direntries);

2719

if(ret == 0){

2720

free(direntries);

2721

}

2181

2722

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

2182

2723

exitcode = EXIT_FAILURE;

2183

2724

goto end;

2206

2747

break;

2207

2748

}

2208

2749

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2750

errno = bring_up_interface(interface, delay);

2210

2751

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2752

if(errno != 0){

2753

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

2754

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

2214

2755

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2756

errno = argz_add(&interfaces_to_take_down,

2757

&interfaces_to_take_down_size,

2758

interface);

2759

if(errno != 0){

2760

perror_plus("argz_add");

2761

}

2218

2762

}

2219

2763

}

2220

2764

}

2236

2780

goto end;

2237

2781

}

2238

2782

2239

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

2783

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

2240

2784

if(ret == -1){

2241

2785

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

2242

2786

exitcode = EX_UNAVAILABLE;

2249

2793

goto end;

2250

2794

}

2251

2795

2252

if(mkdtemp(tempdir) == NULL){

2796

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

2797

tempdir = mkdtemp(run_tempdir);

2798

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

2799

if(debug){

2800

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

2801

run_tempdir, old_tempdir);

2802

}

2803

tempdir = mkdtemp(old_tempdir);

2804

}

2805

if(tempdir == NULL){

2253

2806

perror_plus("mkdtemp");

2254

2807

goto end;

2255

2808

}

2256

tempdir_created = true;

2257

2809

2258

2810

if(quit_now){

2259

2811

goto end;

2334

2886

sleep((unsigned int)retry_interval);

2335

2887

}

2336

2888

2337

if (not quit_now){

2889

if(not quit_now){

2338

2890

exitcode = EXIT_SUCCESS;

2339

2891

}

2340

2892

2356

2908

2357

2909

/* Allocate a new server */

2358

2910

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2359

&config, NULL, NULL, &ret_errno);

2911

&config, NULL, NULL, &ret);

2360

2912

2361

2913

/* Free the Avahi configuration data */

2362

2914

avahi_server_config_free(&config);

2365

2917

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

2366

2918

if(mc.server == NULL){

2367

2919

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

2368

avahi_strerror(ret_errno));

2920

avahi_strerror(ret));

2369

2921

exitcode = EX_UNAVAILABLE;

2370

2922

goto end;

2371

2923

}

2395

2947

if(debug){

2396

2948

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

2397

2949

}

2398

2950

2399

2951

ret = avahi_loop_with_timeout(simple_poll,

2400

2952

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

2401

2953

if(debug){

2406

2958

end:

2407

2959

2408

2960

if(debug){

2409

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

2961

if(signal_received){

2962

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

2963

argv[0], signal_received,

2964

strsignal(signal_received));

2965

} else {

2966

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

2967

}

2410

2968

}

2411

2969

2412

2970

/* Cleanup things */

2423

2981

2424

2982

if(gnutls_initialized){

2425

2983

gnutls_certificate_free_credentials(mc.cred);

2426

gnutls_global_deinit();

2427

2984

gnutls_dh_params_deinit(mc.dh_params);

2428

2985

}

2429

2986

2437

2994

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

2438

2995

while(mc.current_server != NULL){

2439

2996

server *next = mc.current_server->next;

2997

#ifdef __GNUC__

2998

#pragma GCC diagnostic push

2999

#pragma GCC diagnostic ignored "-Wcast-qual"

3000

#endif

3001

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

3002

#ifdef __GNUC__

3003

#pragma GCC diagnostic pop

3004

#endif

2440

3005

free(mc.current_server);

2441

3006

mc.current_server = next;

2442

3007

}

2443

3008

}

2444

3009

2445

/* Re-raise priviliges */

3010

/* Re-raise privileges */

2446

3011

{

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();

3012

ret = raise_privileges();

3013

if(ret != 0){

3014

errno = ret;

3015

perror_plus("Failed to raise privileges");

3016

} else {

3017

3018

/* Run network hooks */

3019

run_network_hooks("stop", interfaces_hooks != NULL ?

3020

interfaces_hooks : "", delay);

3021

3022

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

3023

{

3024

char *interface = NULL;

3025

while((interface=argz_next(interfaces_to_take_down,

3026

interfaces_to_take_down_size,

3027

interface))){

3028

ret = take_down_interface(interface);

3029

if(ret != 0){

3030

errno = ret;

3031

perror_plus("Failed to take down interface");

3032

}

3033

}

3034

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

3035

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

3036

" down\n");

3037

}

3038

}

3039

}

3040

3041

ret = lower_privileges_permanently();

3042

if(ret != 0){

3043

errno = ret;

3044

perror_plus("Failed to lower privileges permanently");

3045

}

2472

3046

}

2473

3047

2474

3048

free(interfaces_to_take_down);

2475

3049

free(interfaces_hooks);

2476

3050

3051

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

3052

uintmax_t level){

3053

struct dirent **direntries = NULL;

3054

int dret;

3055

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

3056

O_RDONLY

3057

| O_NOFOLLOW

3058

| O_DIRECTORY

3059

| O_PATH));

3060

if(dir_fd == -1){

3061

perror_plus("open");

3062

}

3063

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

3064

notdotentries, alphasort);

3065

if(numentries >= 0){

3066

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

3067

if(debug){

3068

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

3069

dirname, direntries[i]->d_name);

3070

}

3071

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

3072

if(dret == -1){

3073

if(errno == EISDIR){

3074

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

3075

AT_REMOVEDIR);

3076

}

3077

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

3078

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

3079

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

3080

/* Recurse only in this special case */

3081

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

3082

dret = 0;

3083

}

3084

if(dret == -1){

3085

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

3086

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

3087

}

3088

}

3089

free(direntries[i]);

3090

}

3091

3092

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

3093

free(direntries);

3094

if(numentries == -1){

3095

perror_plus("scandirat");

3096

}

3097

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3098

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

3099

perror_plus("rmdir");

3100

}

3101

} else {

3102

perror_plus("scandirat");

3103

}

3104

close(dir_fd);

3105

}

3106

2477

3107

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

2478

if(tempdir_created){

2479

struct dirent **direntries = NULL;

2480

struct dirent *direntry = NULL;

2481

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

2482

alphasort);

2483

if (numentries > 0){

2484

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

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

}

3108

if(tempdir != NULL){

3109

clean_dir_at(-1, tempdir, 0);

2511

3110

}

2512

3111

2513

3112

if(quit_now){