/mandos/trunk : revision 609

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

strtof(), abort() */

48

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

49

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

50

asprintf(), strncpy() */

49

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

50

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

51

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

52

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

53

sockaddr_in6, PF_INET6,

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

58

inet_pton(), connect() */

59

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

61

60

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

62

61

*/

63

62

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

64

63

strtoimax() */

65

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

66

EAI_SYSTEM, ENETUNREACH,

67

EHOSTUNREACH, ECONNREFUSED, EPROTO,

68

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

64

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

70

65

program_invocation_short_name */

71

66

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

72

67

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

77

72

*/

78

73

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

79

74

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

80

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

81

unlinkat() */

82

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

75

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

76

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

83

77

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

84

78

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

85

79

argp_state, struct argp,

97

91

argz_delete(), argz_append(),

98

92

argz_stringify(), argz_add(),

99

93

argz_count() */

100

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

101

EAI_SYSTEM, gai_strerror() */

102

94

103

95

#ifdef __linux__

104

96

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

146

138

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

147

139

char *connect_to = NULL;

148

140

const char *hookdir = HOOKDIR;

149

int hookdir_fd = -1;

150

141

uid_t uid = 65534;

151

142

gid_t gid = 65534;

152

143

189

180

perror(print_text);

190

181

}

191

182

192

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

183

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

193

184

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

194

185

va_list ap;

195

186

va_start (ap, format);

196

187

197

188

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

198

189

program_invocation_short_name));

199

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

190

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

200

191

}

201

192

202

193

/*

204

195

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

205

196

* "buffer_length" is how much is already used.

206

197

*/

207

__attribute__((nonnull, warn_unused_result))

208

198

size_t incbuffer(char **buffer, size_t buffer_length,

209

199

size_t buffer_capacity){

210

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

211

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

212

if(new_buf == NULL){

213

int old_errno = errno;

214

free(*buffer);

215

errno = old_errno;

216

*buffer = NULL;

201

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

202

if(buffer == NULL){

217

203

return 0;

218

204

}

219

*buffer = new_buf;

220

205

buffer_capacity += BUFFER_SIZE;

221

206

}

222

207

return buffer_capacity;

223

208

}

224

209

225

210

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

226

__attribute__((nonnull, warn_unused_result))

227

211

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

228

212

int af, server **current_server){

229

213

int ret;

238

222

.af = af };

239

223

if(new_server->ip == NULL){

240

224

perror_plus("strdup");

241

free(new_server);

242

return false;

243

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

#ifdef __GNUC__

248

#pragma GCC diagnostic push

249

#pragma GCC diagnostic ignored "-Wcast-qual"

250

#endif

251

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

252

#ifdef __GNUC__

253

#pragma GCC diagnostic pop

254

#endif

255

free(new_server);

256

225

return false;

257

226

}

258

227

/* Special case of first server */

260

229

new_server->next = new_server;

261

230

new_server->prev = new_server;

262

231

*current_server = new_server;

232

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

263

233

} else {

264

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

265

234

new_server->next = *current_server;

266

235

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

267

236

new_server->prev->next = new_server;

268

237

(*current_server)->prev = new_server;

269

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

270

244

return true;

271

245

}

272

246

273

247

/*

274

248

* Initialize GPGME.

275

249

*/

276

__attribute__((nonnull, warn_unused_result))

277

static bool init_gpgme(const char * const seckey,

278

const char * const pubkey,

279

const char * const tempdir,

280

mandos_context *mc){

250

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

251

const char *tempdir, mandos_context *mc){

281

252

gpgme_error_t rc;

282

253

gpgme_engine_info_t engine_info;

283

254

284

255

/*

285

256

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

286

257

*/

287

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

288

259

int ret;

289

260

int fd;

290

261

gpgme_data_t pgp_data;

309

280

return false;

310

281

}

311

282

312

ret = close(fd);

283

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

313

284

if(ret == -1){

314

285

perror_plus("close");

315

286

}

371

342

* Decrypt OpenPGP data.

372

343

* Returns -1 on error

373

344

*/

374

__attribute__((nonnull, warn_unused_result))

375

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

376

346

size_t crypto_size,

377

347

char **plaintext,

497

467

return plaintext_length;

498

468

}

499

469

500

__attribute__((warn_unused_result, const))

501

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

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

507

__attribute__((warn_unused_result))

508

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

509

471

const char *ret = gnutls_strerror(value);

510

return safe_string(ret);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

511

475

}

512

476

513

477

/* GnuTLS log function callback */

514

__attribute__((nonnull))

515

478

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

516

479

const char* string){

517

480

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

518

481

}

519

482

520

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

521

483

static int init_gnutls_global(const char *pubkeyfilename,

522

484

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

485

mandos_context *mc){

525

486

int ret;

526

unsigned int uret;

527

487

528

488

if(debug){

529

489

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

530

490

}

531

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

532

499

if(debug){

533

500

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

534

501

* - GnuTLS manual

542

509

if(ret != GNUTLS_E_SUCCESS){

543

510

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

544

511

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

545

513

return -1;

546

514

}

547

515

572

540

safer_gnutls_strerror(ret));

573

541

goto globalfail;

574

542

}

575

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

576

if(dhparamsfilename != NULL){

577

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

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

586

while(true){

587

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

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

591

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

595

break;

596

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

599

BUFFER_SIZE);

600

/* EOF */

601

if(bytes_read == 0){

602

break;

603

}

604

/* check bytes_read for failure */

605

if(bytes_read < 0){

606

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

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

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

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

624

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

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

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

633

/* Try to read the private key file */

634

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

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

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

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

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

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

676

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

679

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

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

685

if(ret != GNUTLS_E_SUCCESS){

686

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

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

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

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

704

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

714

}

715

}

716

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

720

if(debug){

721

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

722

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

723

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

726

}

727

} else {

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

734

}

735

} else if(debug){

736

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

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

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

742

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

743

safer_gnutls_strerror(ret));

744

goto globalfail;

745

}

746

}

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

747

550

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

748

551

749

552

return 0;

751

554

globalfail:

752

555

753

556

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

754

558

gnutls_dh_params_deinit(mc->dh_params);

755

559

return -1;

756

560

}

757

561

758

__attribute__((nonnull, warn_unused_result))

759

562

static int init_gnutls_session(gnutls_session_t *session,

760

563

mandos_context *mc){

761

564

int ret;

808

611

/* ignore client certificate if any. */

809

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

613

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

811

616

return 0;

812

617

}

813

618

815

620

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

816

621

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

817

622

818

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

819

__attribute__((warn_unused_result))

820

int raise_privileges(void){

821

int old_errno = errno;

822

int ret = 0;

823

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

824

ret = errno;

825

}

826

errno = old_errno;

827

return ret;

828

}

829

830

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

831

__attribute__((warn_unused_result))

832

int raise_privileges_permanently(void){

833

int old_errno = errno;

834

int ret = raise_privileges();

835

if(ret != 0){

836

errno = old_errno;

837

return ret;

838

}

839

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

840

ret = errno;

841

}

842

errno = old_errno;

843

return ret;

844

}

845

846

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

847

__attribute__((warn_unused_result))

848

int lower_privileges(void){

849

int old_errno = errno;

850

int ret = 0;

851

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

852

ret = errno;

853

}

854

errno = old_errno;

855

return ret;

856

}

857

858

/* Lower privileges permanently */

859

__attribute__((warn_unused_result))

860

int lower_privileges_permanently(void){

861

int old_errno = errno;

862

int ret = 0;

863

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

864

ret = errno;

865

}

866

errno = old_errno;

867

return ret;

868

}

869

870

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

871

__attribute__((nonnull, warn_unused_result))

872

static bool add_delete_local_route(const bool add,

873

const char *address,

874

AvahiIfIndex if_index){

875

int ret;

876

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

877

char add_arg[] = "add";

878

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

880

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

881

if(pluginhelperdir == NULL){

882

if(debug){

883

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

884

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

885

}

886

return false;

887

}

888

889

char interface[IF_NAMESIZE];

890

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

891

perror_plus("if_indextoname");

892

return false;

893

}

894

895

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

896

if(devnull == -1){

897

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

898

return false;

899

}

900

pid_t pid = fork();

901

if(pid == 0){

902

/* Child */

903

/* Raise privileges */

904

errno = raise_privileges_permanently();

905

if(errno != 0){

906

perror_plus("Failed to raise privileges");

907

/* _exit(EX_NOPERM); */

908

} else {

909

/* Set group */

910

errno = 0;

911

ret = setgid(0);

912

if(ret == -1){

913

perror_plus("setgid");

914

_exit(EX_NOPERM);

915

}

916

/* Reset supplementary groups */

917

errno = 0;

918

ret = setgroups(0, NULL);

919

if(ret == -1){

920

perror_plus("setgroups");

921

_exit(EX_NOPERM);

922

}

923

}

924

ret = dup2(devnull, STDIN_FILENO);

925

if(ret == -1){

926

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

927

_exit(EX_OSERR);

928

}

929

ret = close(devnull);

930

if(ret == -1){

931

perror_plus("close");

932

_exit(EX_OSERR);

933

}

934

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

935

if(ret == -1){

936

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

937

_exit(EX_OSERR);

938

}

939

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

940

O_RDONLY

941

| O_DIRECTORY

942

| O_PATH

943

| O_CLOEXEC));

944

if(helperdir_fd == -1){

945

perror_plus("open");

946

_exit(EX_UNAVAILABLE);

947

}

948

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

949

helper, O_RDONLY));

950

if(helper_fd == -1){

951

perror_plus("openat");

952

close(helperdir_fd);

953

_exit(EX_UNAVAILABLE);

954

}

955

close(helperdir_fd);

956

#ifdef __GNUC__

957

#pragma GCC diagnostic push

958

#pragma GCC diagnostic ignored "-Wcast-qual"

959

#endif

960

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

961

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

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

964

#ifdef __GNUC__

965

#pragma GCC diagnostic pop

966

#endif

967

perror_plus("fexecve");

968

_exit(EXIT_FAILURE);

969

}

970

}

971

if(pid == -1){

972

perror_plus("fork");

973

return false;

974

}

975

int status;

976

pid_t pret = -1;

977

errno = 0;

978

do {

979

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

980

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

981

int errno_raising = 0;

982

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

983

errno_raising = errno;

984

perror_plus("Failed to raise privileges in order to"

985

" kill helper program");

986

}

987

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

988

perror_plus("kill");

989

}

990

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

991

perror_plus("Failed to lower privileges after killing"

992

" helper program");

993

}

994

return false;

995

}

996

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

997

if(pret == -1){

998

perror_plus("waitpid");

999

return false;

1000

}

1001

if(WIFEXITED(status)){

1002

if(WEXITSTATUS(status) != 0){

1003

fprintf_plus(stderr, "Error: iprouteadddel exited"

1004

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

1005

return false;

1006

}

1007

return true;

1008

}

1009

if(WIFSIGNALED(status)){

1010

fprintf_plus(stderr, "Error: iprouteadddel died by"

1011

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

1012

return false;

1013

}

1014

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

1015

return false;

1016

}

1017

1018

__attribute__((nonnull, warn_unused_result))

1019

static bool add_local_route(const char *address,

1020

AvahiIfIndex if_index){

1021

if(debug){

1022

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

1023

}

1024

return add_delete_local_route(true, address, if_index);

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool delete_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(false, address, if_index);

1034

}

1035

1036

623

/* Called when a Mandos server is found */

1037

__attribute__((nonnull, warn_unused_result))

1038

624

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

1039

625

AvahiIfIndex if_index,

1040

626

int af, mandos_context *mc){

1041

627

int ret, tcp_sd = -1;

1042

628

ssize_t sret;

1043

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1044

633

char *buffer = NULL;

1045

634

char *decrypted_buffer = NULL;

1046

635

size_t buffer_length = 0;

1049

638

int retval = -1;

1050

639

gnutls_session_t session;

1051

640

int pf; /* Protocol family */

1052

bool route_added = false;

1053

641

1054

642

errno = 0;

1055

643

1113

701

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

1114

702

}

1115

703

1116

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

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

705

if(tcp_sd < 0){

1118

706

int e = errno;

1119

707

perror_plus("socket");

1126

714

goto mandos_end;

1127

715

}

1128

716

717

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

1129

718

if(af == AF_INET6){

1130

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

1131

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

1132

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);

1133

721

} else { /* IPv4 */

1134

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

1135

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

1136

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);

1137

724

}

1138

725

if(ret < 0 ){

1139

726

int e = errno;

1148

735

goto mandos_end;

1149

736

}

1150

737

if(af == AF_INET6){

1151

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

1152

if(IN6_IS_ADDR_LINKLOCAL

1153

(&((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*/

1154

742

if(if_index == AVAHI_IF_UNSPEC){

1155

743

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

1156

744

" incomplete without a network interface\n");

1158

746

goto mandos_end;

1159

747

}

1160

748

/* Set the network interface number as scope */

1161

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

749

to.in6.sin6_scope_id = (uint32_t)if_index;

1162

750

}

1163

751

} else {

1164

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

752

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

753

-Wconversion and

754

-Wunreachable-code */

1165

755

}

1166

756

1167

757

if(quit_now){

1184

774

}

1185

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1186

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1187

if(af == AF_INET6){

1188

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

1189

sizeof(struct sockaddr_in6),

1190

addrstr, sizeof(addrstr), NULL, 0,

1191

NI_NUMERICHOST);

1192

} else {

1193

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

1194

sizeof(struct sockaddr_in),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

}

1198

if(ret == EAI_SYSTEM){

1199

perror_plus("getnameinfo");

1200

} else if(ret != 0) {

1201

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

1202

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

1203

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

1204

}

1205

}

1206

1207

if(quit_now){

1208

errno = EINTR;

1209

goto mandos_end;

1210

}

1211

1212

while(true){

1213

if(af == AF_INET6){

1214

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

1215

sizeof(struct sockaddr_in6));

1216

} else {

1217

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

1218

sizeof(struct sockaddr_in));

1219

}

1220

if(ret < 0){

1221

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

1222

and if_index != AVAHI_IF_UNSPEC

1223

and connect_to == NULL

1224

and not route_added and

1225

((af == AF_INET6 and not

1226

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1227

&to)->sin6_addr)))

1228

or (af == AF_INET and

1229

/* Not a a IPv4LL address */

1230

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

1231

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

1232

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

1233

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

1234

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

1235

connect to a Mandos server announced by Avahi on a server

1236

host with a global address. Work around this by retrying

1237

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

1238

1239

Avahi bug reference:

1240

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

1241

https://bugs.debian.org/587961

1242

*/

1243

if(debug){

1244

fprintf_plus(stderr, "Mandos server unreachable, trying"

1245

" direct route\n");

1246

}

1247

int e = errno;

1248

route_added = add_local_route(ip, if_index);

1249

if(route_added){

1250

continue;

1251

}

1252

errno = e;

1253

}

1254

if(errno != ECONNREFUSED or debug){

1255

int e = errno;

1256

perror_plus("connect");

1257

errno = e;

1258

}

1259

goto mandos_end;

1260

}

1261

1262

if(quit_now){

1263

errno = EINTR;

1264

goto mandos_end;

1265

}

1266

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;

1267

816

}

1268

817

1269

818

const char *out = mandos_protocol_version;

1423

972

&decrypted_buffer, mc);

1424

973

if(decrypted_buffer_size >= 0){

1425

974

1426

clearerr(stdout);

1427

975

written = 0;

1428

976

while(written < (size_t) decrypted_buffer_size){

1429

977

if(quit_now){

1445

993

}

1446

994

written += (size_t)ret;

1447

995

}

1448

ret = fflush(stdout);

1449

if(ret != 0){

1450

int e = errno;

1451

if(debug){

1452

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

1453

strerror(errno));

1454

}

1455

errno = e;

1456

goto mandos_end;

1457

}

1458

996

retval = 0;

1459

997

}

1460

998

}

1463

1001

1464

1002

mandos_end:

1465

1003

{

1466

if(route_added){

1467

if(not delete_local_route(ip, if_index)){

1468

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

1469

" interface %d", ip, if_index);

1470

}

1471

}

1472

1004

int e = errno;

1473

1005

free(decrypted_buffer);

1474

1006

free(buffer);

1475

1007

if(tcp_sd >= 0){

1476

ret = close(tcp_sd);

1008

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

1477

1009

}

1478

1010

if(ret == -1){

1479

1011

if(e == 0){

1491

1023

return retval;

1492

1024

}

1493

1025

1494

__attribute__((nonnull))

1495

1026

static void resolve_callback(AvahiSServiceResolver *r,

1496

1027

AvahiIfIndex interface,

1497

1028

AvahiProtocol proto,

1505

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

1506

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1507

1038

flags,

1508

void *mc){

1039

void* mc){

1509

1040

if(r == NULL){

1510

1041

return;

1511

1042

}

1514

1045

timed out */

1515

1046

1516

1047

if(quit_now){

1517

avahi_s_service_resolver_free(r);

1518

1048

return;

1519

1049

}

1520

1050

1565

1095

const char *domain,

1566

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1567

1097

flags,

1568

void *mc){

1098

void* mc){

1569

1099

if(b == NULL){

1570

1100

return;

1571

1101

}

1631

1161

errno = old_errno;

1632

1162

}

1633

1163

1634

__attribute__((nonnull, warn_unused_result))

1635

1164

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

1636

1165

int ret;

1637

int old_errno;

1166

error_t ret_errno;

1638

1167

1639

1168

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

1640

1169

if(s < 0){

1641

old_errno = errno;

1170

ret_errno = errno;

1642

1171

perror_plus("socket");

1643

errno = old_errno;

1172

errno = ret_errno;

1644

1173

return false;

1645

1174

}

1646

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

1647

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

1175

strcpy(ifr->ifr_name, ifname);

1648

1176

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1649

1177

if(ret == -1){

1650

1178

if(debug){

1651

old_errno = errno;

1179

ret_errno = errno;

1652

1180

perror_plus("ioctl SIOCGIFFLAGS");

1653

errno = old_errno;

1181

errno = ret_errno;

1654

1182

}

1655

1183

return false;

1656

1184

}

1657

1185

return true;

1658

1186

}

1659

1187

1660

__attribute__((nonnull, warn_unused_result))

1661

1188

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

1662

1189

1663

1190

/* Reject the loopback device */

1705

1232

* corresponds to an acceptable network device.

1706

1233

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

1707

1234

*/

1708

__attribute__((nonnull, warn_unused_result))

1709

1235

int good_interface(const struct dirent *if_entry){

1710

1236

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

1711

1237

return 0;

1729

1255

/*

1730

1256

* This function determines if a network interface is up.

1731

1257

*/

1732

__attribute__((nonnull, warn_unused_result))

1733

1258

bool interface_is_up(const char *interface){

1734

1259

struct ifreq ifr;

1735

1260

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

1746

1271

/*

1747

1272

* This function determines if a network interface is running

1748

1273

*/

1749

__attribute__((nonnull, warn_unused_result))

1750

1274

bool interface_is_running(const char *interface){

1751

1275

struct ifreq ifr;

1752

1276

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

1760

1284

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

1761

1285

}

1762

1286

1763

__attribute__((nonnull, pure, warn_unused_result))

1764

1287

int notdotentries(const struct dirent *direntry){

1765

1288

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

1766

1289

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

1773

1296

}

1774

1297

1775

1298

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

1776

__attribute__((nonnull, warn_unused_result))

1777

1299

int runnable_hook(const struct dirent *direntry){

1778

1300

int ret;

1779

1301

size_t sret;

1787

1309

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

1788

1310

"abcdefghijklmnopqrstuvwxyz"

1789

1311

"0123456789"

1790

"_.-");

1312

"_-");

1791

1313

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

1792

1314

/* Contains non-allowed characters */

1793

1315

if(debug){

1797

1319

return 0;

1798

1320

}

1799

1321

1800

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);

1801

1330

if(ret == -1){

1802

1331

if(debug){

1803

1332

perror_plus("Could not stat hook");

1827

1356

return 1;

1828

1357

}

1829

1358

1830

__attribute__((nonnull, warn_unused_result))

1831

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1832

1360

mandos_context *mc){

1833

1361

int ret;

1837

1365

1838

1366

while(true){

1839

1367

if(mc->current_server == NULL){

1840

if(debug){

1368

if (debug){

1841

1369

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

1842

1370

" No timeout!\n");

1843

1371

}

1844

1372

ret = avahi_simple_poll_iterate(s, -1);

1845

1373

} else {

1846

if(debug){

1374

if (debug){

1847

1375

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

1848

1376

" it, or wait\n");

1849

1377

}

1866

1394

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

1867

1395

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

1868

1396

1869

if(debug){

1397

if (debug){

1870

1398

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

1871

1399

block_time);

1872

1400

}

1894

1422

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

1895

1423

}

1896

1424

if(ret != 0){

1897

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

1425

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

1898

1426

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

1899

1427

}

1900

1428

}

1901

1429

}

1902

1430

}

1903

1431

1904

__attribute__((nonnull))

1905

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,

1906

1485

const float delay){

1907

struct dirent **direntries = NULL;

1908

if(hookdir_fd == -1){

1909

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1910

| O_CLOEXEC);

1911

if(hookdir_fd == -1){

1912

if(errno == ENOENT){

1913

if(debug){

1914

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

1915

" found\n", hookdir);

1916

}

1917

} else {

1918

perror_plus("open");

1919

}

1920

return;

1921

}

1922

}

1923

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

1924

runnable_hook, alphasort);

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

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

1490

alphasort);

1925

1491

if(numhooks == -1){

1926

perror_plus("scandir");

1927

return;

1928

}

1929

struct dirent *direntry;

1930

int ret;

1931

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

1932

if(devnull == -1){

1933

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

1934

return;

1935

}

1936

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

1937

direntry = direntries[i];

1938

if(debug){

1939

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

1940

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");

1941

1499

}

1942

pid_t hook_pid = fork();

1943

if(hook_pid == 0){

1944

/* Child */

1945

/* Raise privileges */

1946

errno = raise_privileges_permanently();

1947

if(errno != 0){

1948

perror_plus("Failed to raise privileges");

1949

_exit(EX_NOPERM);

1950

}

1951

/* Set group */

1952

errno = 0;

1953

ret = setgid(0);

1954

if(ret == -1){

1955

perror_plus("setgid");

1956

_exit(EX_NOPERM);

1957

}

1958

/* Reset supplementary groups */

1959

errno = 0;

1960

ret = setgroups(0, NULL);

1961

if(ret == -1){

1962

perror_plus("setgroups");

1963

_exit(EX_NOPERM);

1964

}

1965

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

1966

if(ret == -1){

1967

perror_plus("setenv");

1968

_exit(EX_OSERR);

1969

}

1970

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

1971

if(ret == -1){

1972

perror_plus("setenv");

1973

_exit(EX_OSERR);

1974

}

1975

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

1976

if(ret == -1){

1977

perror_plus("setenv");

1978

_exit(EX_OSERR);

1979

}

1980

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

1981

if(ret == -1){

1982

perror_plus("setenv");

1983

_exit(EX_OSERR);

1984

}

1985

char *delaystring;

1986

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

1987

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){

1988

1507

perror_plus("asprintf");

1989

_exit(EX_OSERR);

1990

}

1991

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

1992

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

}

1993

1566

free(delaystring);

1994

perror_plus("setenv");

1995

_exit(EX_OSERR);

1996

}

1997

free(delaystring);

1998

if(connect_to != NULL){

1999

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

2000

if(ret == -1){

2001

perror_plus("setenv");

2002

_exit(EX_OSERR);

2003

}

2004

}

2005

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

2006

direntry->d_name,

2007

O_RDONLY));

2008

if(hook_fd == -1){

2009

perror_plus("openat");

2010

_exit(EXIT_FAILURE);

2011

}

2012

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

2013

perror_plus("close");

2014

_exit(EXIT_FAILURE);

2015

}

2016

ret = dup2(devnull, STDIN_FILENO);

2017

if(ret == -1){

2018

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

2019

_exit(EX_OSERR);

2020

}

2021

ret = close(devnull);

2022

if(ret == -1){

2023

perror_plus("close");

2024

_exit(EX_OSERR);

2025

}

2026

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2027

if(ret == -1){

2028

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

2029

_exit(EX_OSERR);

2030

}

2031

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

2032

environ) == -1){

2033

perror_plus("fexecve");

2034

_exit(EXIT_FAILURE);

2035

}

2036

} else {

2037

if(hook_pid == -1){

2038

perror_plus("fork");

2039

free(direntry);

2040

continue;

2041

}

2042

int status;

2043

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

2044

perror_plus("waitpid");

2045

free(direntry);

2046

continue;

2047

}

2048

if(WIFEXITED(status)){

2049

if(WEXITSTATUS(status) != 0){

2050

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

2051

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

2052

WEXITSTATUS(status));

2053

free(direntry);

2054

continue;

2055

}

2056

} else if(WIFSIGNALED(status)){

2057

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

2058

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

2059

WTERMSIG(status));

2060

free(direntry);

2061

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

}

2062

1578

} else {

2063

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

2064

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

2065

free(direntry);

2066

continue;

2067

}

2068

}

2069

if(debug){

2070

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

2071

direntry->d_name);

2072

}

2073

free(direntry);

2074

}

2075

free(direntries);

2076

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

2077

perror_plus("close");

2078

} else {

2079

hookdir_fd = -1;

2080

}

2081

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;

2082

1615

}

2083

1616

2084

__attribute__((nonnull, warn_unused_result))

2085

int bring_up_interface(const char *const interface,

2086

const float delay){

2087

int old_errno = errno;

2088

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;

2089

1623

struct ifreq network;

2090

1624

unsigned int if_index = if_nametoindex(interface);

2091

1625

if(if_index == 0){

2100

1634

}

2101

1635

2102

1636

if(not interface_is_up(interface)){

2103

int ret_errno = 0;

2104

int ioctl_errno = 0;

2105

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

1637

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

2106

1638

ret_errno = errno;

2107

1639

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

2108

1640

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

2109

errno = old_errno;

2110

1641

return ret_errno;

2111

1642

}

2112

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

1643

network.ifr_flags |= IFF_UP;

2113

1644

2114

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

2115

if(sd == -1){

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

2116

1647

ret_errno = errno;

2117

1648

perror_plus("socket");

2118

1649

errno = old_errno;

2119

1650

return ret_errno;

2120

1651

}

2121

1652

2122

1653

if(quit_now){

2123

ret = close(sd);

2124

if(ret == -1){

2125

perror_plus("close");

2126

}

1654

close(sd);

2127

1655

errno = old_errno;

2128

1656

return EINTR;

2129

1657

}

2133

1661

interface);

2134

1662

}

2135

1663

2136

/* Raise privileges */

2137

ret_errno = raise_privileges();

2138

if(ret_errno != 0){

2139

errno = ret_errno;

2140

perror_plus("Failed to raise privileges");

2141

}

1664

/* Raise priviliges */

1665

raise_privileges();

2142

1666

2143

1667

#ifdef __linux__

2144

int ret_linux;

2145

bool restore_loglevel = false;

2146

if(ret_errno == 0){

2147

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2148

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

2149

ret_linux = klogctl(8, NULL, 5);

2150

if(ret_linux == -1){

2151

perror_plus("klogctl");

2152

} else {

2153

restore_loglevel = true;

2154

}

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");

2155

1675

}

2156

1676

#endif /* __linux__ */

2157

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

2158

ioctl_errno = errno;

1677

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

1678

ret_errno = errno;

2159

1679

#ifdef __linux__

2160

1680

if(restore_loglevel){

2161

1681

ret_linux = klogctl(7, NULL, 0);

2165

1685

}

2166

1686

#endif /* __linux__ */

2167

1687

2168

/* If raise_privileges() succeeded above */

2169

if(ret_errno == 0){

2170

/* Lower privileges */

2171

ret_errno = lower_privileges();

2172

if(ret_errno != 0){

2173

errno = ret_errno;

2174

perror_plus("Failed to lower privileges");

2175

}

2176

}

1688

/* Lower privileges */

1689

lower_privileges();

2177

1690

2178

1691

/* Close the socket */

2179

ret = close(sd);

1692

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

2180

1693

if(ret == -1){

2181

1694

perror_plus("close");

2182

1695

}

2183

1696

2184

1697

if(ret_setflags == -1){

2185

errno = ioctl_errno;

1698

errno = ret_errno;

2186

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2187

1700

errno = old_errno;

2188

return ioctl_errno;

1701

return ret_errno;

2189

1702

}

2190

1703

} else if(debug){

2191

1704

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

2209

1722

return 0;

2210

1723

}

2211

1724

2212

__attribute__((nonnull, warn_unused_result))

2213

int take_down_interface(const char *const interface){

2214

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;

2215

1730

struct ifreq network;

2216

1731

unsigned int if_index = if_nametoindex(interface);

2217

1732

if(if_index == 0){

2220

1735

return ENXIO;

2221

1736

}

2222

1737

if(interface_is_up(interface)){

2223

int ret_errno = 0;

2224

int ioctl_errno = 0;

2225

1738

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

2226

1739

ret_errno = errno;

2227

1740

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

2228

1741

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

2229

errno = old_errno;

2230

1742

return ret_errno;

2231

1743

}

2232

1744

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

2233

1745

2234

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

2235

if(sd == -1){

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

2236

1748

ret_errno = errno;

2237

1749

perror_plus("socket");

2238

1750

errno = old_errno;

2244

1756

interface);

2245

1757

}

2246

1758

2247

/* Raise privileges */

2248

ret_errno = raise_privileges();

2249

if(ret_errno != 0){

2250

errno = ret_errno;

2251

perror_plus("Failed to raise privileges");

2252

}

2253

2254

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

2255

ioctl_errno = errno;

2256

2257

/* If raise_privileges() succeeded above */

2258

if(ret_errno == 0){

2259

/* Lower privileges */

2260

ret_errno = lower_privileges();

2261

if(ret_errno != 0){

2262

errno = ret_errno;

2263

perror_plus("Failed to lower privileges");

2264

}

2265

}

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();

2266

1767

2267

1768

/* Close the socket */

2268

int ret = close(sd);

1769

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

2269

1770

if(ret == -1){

2270

1771

perror_plus("close");

2271

1772

}

2272

1773

2273

1774

if(ret_setflags == -1){

2274

errno = ioctl_errno;

1775

errno = ret_errno;

2275

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2276

1777

errno = old_errno;

2277

return ioctl_errno;

1778

return ret_errno;

2278

1779

}

2279

1780

} else if(debug){

2280

1781

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

2286

1787

}

2287

1788

2288

1789

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

2289

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

2290

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

2291

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

2292

.current_server = NULL, .interfaces = NULL,

2293

.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 };

2294

1794

AvahiSServiceBrowser *sb = NULL;

2295

1795

error_t ret_errno;

2296

1796

int ret;

2299

1799

int exitcode = EXIT_SUCCESS;

2300

1800

char *interfaces_to_take_down = NULL;

2301

1801

size_t interfaces_to_take_down_size = 0;

2302

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

2303

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

2304

char *tempdir = NULL;

1802

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

1803

bool tempdir_created = false;

2305

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2306

1805

const char *seckey = PATHDIR "/" SECKEY;

2307

1806

const char *pubkey = PATHDIR "/" PUBKEY;

2308

const char *dh_params_file = NULL;

2309

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

2310

1809

2311

1810

bool gnutls_initialized = false;

2312

1811

bool gpgme_initialized = false;

2364

1863

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

2365

1864

" Diffie-Hellman key exchange",

2366

1865

.group = 2 },

2367

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

2368

.arg = "FILE",

2369

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

2370

" for the Diffie-Hellman key exchange",

2371

.group = 2 },

2372

1866

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

2373

1867

.arg = "STRING",

2374

1868

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

2429

1923

}

2430

1924

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

2431

1925

break;

2432

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

2433

dh_params_file = arg;

2434

break;

2435

1926

case 130: /* --priority */

2436

1927

mc.priority = arg;

2437

1928

break;

2477

1968

.args_doc = "",

2478

1969

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

2479

1970

" passwords from a Mandos server" };

2480

ret_errno = argp_parse(&argp, argc, argv,

2481

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2482

switch(ret_errno){

1971

ret = argp_parse(&argp, argc, argv,

1972

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1973

switch(ret){

2483

1974

case 0:

2484

1975

break;

2485

1976

case ENOMEM:

2486

1977

default:

2487

errno = ret_errno;

1978

errno = ret;

2488

1979

perror_plus("argp_parse");

2489

1980

exitcode = EX_OSERR;

2490

1981

goto end;

2493

1984

goto end;

2494

1985

}

2495

1986

}

2496

1987

2497

1988

{

2498

1989

/* Work around Debian bug #633582:

2499

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

1990

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

2500

1991

2501

/* Re-raise privileges */

2502

ret = raise_privileges();

2503

if(ret != 0){

2504

errno = ret;

2505

perror_plus("Failed to raise privileges");

2506

} else {

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2507

1994

struct stat st;

2508

1995

2509

1996

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

2523

2010

}

2524

2011

}

2525

2012

}

2526

close(seckey_fd);

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2527

2014

}

2528

2015

}

2529

2016

2530

2017

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

2531

2018

int pubkey_fd = open(pubkey, O_RDONLY);

2532

2019

if(pubkey_fd == -1){

2544

2031

}

2545

2032

}

2546

2033

}

2547

close(pubkey_fd);

2548

}

2549

}

2550

2551

if(dh_params_file != NULL

2552

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

2553

int dhparams_fd = open(dh_params_file, O_RDONLY);

2554

if(dhparams_fd == -1){

2555

perror_plus("open");

2556

} else {

2557

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

2558

if(ret == -1){

2559

perror_plus("fstat");

2560

} else {

2561

if(S_ISREG(st.st_mode)

2562

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

2563

ret = fchown(dhparams_fd, uid, gid);

2564

if(ret == -1){

2565

perror_plus("fchown");

2566

}

2567

}

2568

}

2569

close(dhparams_fd);

2570

}

2571

}

2572

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

2037

2573

2038

/* Lower privileges */

2574

ret = lower_privileges();

2575

if(ret != 0){

2576

errno = ret;

2577

perror_plus("Failed to lower privileges");

2578

}

2039

lower_privileges();

2579

2040

}

2580

2041

}

2581

2042

2605

2066

goto end;

2606

2067

}

2607

2068

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

2608

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

2609

}

2610

run_network_hooks("start", interfaces_hooks != NULL ?

2611

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

}

2612

2077

}

2613

2078

2614

2079

if(not debug){

2692

2157

2693

2158

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

2694

2159

if(mc.interfaces == NULL){

2695

struct dirent **direntries = NULL;

2160

struct dirent **direntries;

2696

2161

/* Look for any good interfaces */

2697

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2698

2163

alphasort);

2702

2167

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

2703

2168

direntries[i]->d_name);

2704

2169

if(ret_errno != 0){

2705

errno = ret_errno;

2706

2170

perror_plus("argz_add");

2707

free(direntries[i]);

2708

2171

continue;

2709

2172

}

2710

2173

if(debug){

2711

2174

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

2712

2175

direntries[i]->d_name);

2713

2176

}

2714

free(direntries[i]);

2715

2177

}

2716

2178

free(direntries);

2717

2179

} else {

2718

if(ret == 0){

2719

free(direntries);

2720

}

2180

free(direntries);

2721

2181

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

2722

2182

exitcode = EXIT_FAILURE;

2723

2183

goto end;

2746

2206

break;

2747

2207

}

2748

2208

bool interface_was_up = interface_is_up(interface);

2749

errno = bring_up_interface(interface, delay);

2209

ret = bring_up_interface(interface, delay);

2750

2210

if(not interface_was_up){

2751

if(errno != 0){

2752

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

2753

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

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2754

2214

} else {

2755

errno = argz_add(&interfaces_to_take_down,

2756

&interfaces_to_take_down_size,

2757

interface);

2758

if(errno != 0){

2759

perror_plus("argz_add");

2760

}

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2761

2218

}

2762

2219

}

2763

2220

}

2779

2236

goto end;

2780

2237

}

2781

2238

2782

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

2239

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

2783

2240

if(ret == -1){

2784

2241

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

2785

2242

exitcode = EX_UNAVAILABLE;

2792

2249

goto end;

2793

2250

}

2794

2251

2795

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

2796

tempdir = mkdtemp(run_tempdir);

2797

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

2798

if(debug){

2799

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

2800

run_tempdir, old_tempdir);

2801

}

2802

tempdir = mkdtemp(old_tempdir);

2803

}

2804

if(tempdir == NULL){

2252

if(mkdtemp(tempdir) == NULL){

2805

2253

perror_plus("mkdtemp");

2806

2254

goto end;

2807

2255

}

2256

tempdir_created = true;

2808

2257

2809

2258

if(quit_now){

2810

2259

goto end;

2882

2331

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

2883

2332

(int)retry_interval);

2884

2333

}

2885

sleep((unsigned int)retry_interval);

2334

sleep((int)retry_interval);

2886

2335

}

2887

2336

2888

if(not quit_now){

2337

if (not quit_now){

2889

2338

exitcode = EXIT_SUCCESS;

2890

2339

}

2891

2340

2907

2356

2908

2357

/* Allocate a new server */

2909

2358

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2910

&config, NULL, NULL, &ret);

2359

&config, NULL, NULL, &ret_errno);

2911

2360

2912

2361

/* Free the Avahi configuration data */

2913

2362

avahi_server_config_free(&config);

2916

2365

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

2917

2366

if(mc.server == NULL){

2918

2367

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

2919

avahi_strerror(ret));

2368

avahi_strerror(ret_errno));

2920

2369

exitcode = EX_UNAVAILABLE;

2921

2370

goto end;

2922

2371

}

2946

2395

if(debug){

2947

2396

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

2948

2397

}

2949

2398

2950

2399

ret = avahi_loop_with_timeout(simple_poll,

2951

2400

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

2952

2401

if(debug){

2974

2423

2975

2424

if(gnutls_initialized){

2976

2425

gnutls_certificate_free_credentials(mc.cred);

2426

gnutls_global_deinit();

2977

2427

gnutls_dh_params_deinit(mc.dh_params);

2978

2428

}

2979

2429

2987

2437

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

2988

2438

while(mc.current_server != NULL){

2989

2439

server *next = mc.current_server->next;

2990

#ifdef __GNUC__

2991

#pragma GCC diagnostic push

2992

#pragma GCC diagnostic ignored "-Wcast-qual"

2993

#endif

2994

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

2995

#ifdef __GNUC__

2996

#pragma GCC diagnostic pop

2997

#endif

2998

2440

free(mc.current_server);

2999

2441

mc.current_server = next;

3000

2442

}

3001

2443

}

3002

2444

3003

/* Re-raise privileges */

2445

/* Re-raise priviliges */

3004

2446

{

3005

ret = raise_privileges();

3006

if(ret != 0){

3007

errno = ret;

3008

perror_plus("Failed to raise privileges");

3009

} else {

3010

3011

/* Run network hooks */

3012

run_network_hooks("stop", interfaces_hooks != NULL ?

3013

interfaces_hooks : "", delay);

3014

3015

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

3016

{

3017

char *interface = NULL;

3018

while((interface=argz_next(interfaces_to_take_down,

3019

interfaces_to_take_down_size,

3020

interface))){

3021

ret = take_down_interface(interface);

3022

if(ret != 0){

3023

errno = ret;

3024

perror_plus("Failed to take down interface");

3025

}

3026

}

3027

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

3028

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

3029

" down\n");

3030

}

3031

}

3032

}

3033

3034

ret = lower_privileges_permanently();

3035

if(ret != 0){

3036

errno = ret;

3037

perror_plus("Failed to lower privileges permanently");

3038

}

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();

3039

2472

}

3040

2473

3041

2474

free(interfaces_to_take_down);

3042

2475

free(interfaces_hooks);

3043

2476

3044

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

3045

uintmax_t level){

2477

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

2478

if(tempdir_created){

3046

2479

struct dirent **direntries = NULL;

3047

int dret;

3048

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

3049

O_RDONLY

3050

| O_NOFOLLOW

3051

| O_DIRECTORY

3052

| O_PATH));

3053

if(dir_fd == -1){

3054

perror_plus("open");

3055

}

3056

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

3057

notdotentries, alphasort);

3058

if(numentries >= 0){

2480

struct dirent *direntry = NULL;

2481

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

2482

alphasort);

2483

if (numentries > 0){

3059

2484

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

3060

if(debug){

3061

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

3062

dirname, direntries[i]->d_name);

3063

}

3064

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

3065

if(dret == -1){

3066

if(errno == EISDIR){

3067

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

3068

AT_REMOVEDIR);

3069

}

3070

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

3071

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

3072

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

3073

/* Recurse only in this special case */

3074

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

3075

dret = 0;

3076

}

3077

if(dret == -1){

3078

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

3079

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

3080

}

3081

}

3082

free(direntries[i]);

3083

}

3084

3085

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

3086

free(direntries);

3087

if(numentries == -1){

3088

perror_plus("scandirat");

3089

}

3090

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3091

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

3092

perror_plus("rmdir");

3093

}

3094

} else {

3095

perror_plus("scandirat");

3096

}

3097

close(dir_fd);

3098

}

3099

3100

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

3101

if(tempdir != NULL){

3102

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

}

3103

2511

}

3104

2512

3105

2513

if(quit_now){