/mandos/trunk : revision 833

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() */

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

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

61

62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

66

EAI_SYSTEM, ENETUNREACH,

67

EHOSTUNREACH, ECONNREFUSED, EPROTO,

68

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

65

70

program_invocation_short_name */

66

71

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

67

72

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

72

77

*/

73

78

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

74

79

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

75

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

76

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

80

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

81

unlinkat() */

82

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

77

83

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

78

84

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

79

85

argp_state, struct argp,

91

97

argz_delete(), argz_append(),

92

98

argz_stringify(), argz_add(),

93

99

argz_count() */

100

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

101

EAI_SYSTEM, gai_strerror() */

94

102

95

103

#ifdef __linux__

96

104

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

138

146

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

139

147

char *connect_to = NULL;

140

148

const char *hookdir = HOOKDIR;

149

int hookdir_fd = -1;

141

150

uid_t uid = 65534;

142

151

gid_t gid = 65534;

143

152

180

189

perror(print_text);

181

190

}

182

191

183

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

192

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

184

193

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

185

194

va_list ap;

186

195

va_start (ap, format);

187

196

188

197

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

189

198

program_invocation_short_name));

190

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

199

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

191

200

}

192

201

193

202

/*

195

204

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

196

205

* "buffer_length" is how much is already used.

197

206

*/

207

__attribute__((nonnull, warn_unused_result))

198

208

size_t incbuffer(char **buffer, size_t buffer_length,

199

209

size_t buffer_capacity){

200

210

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

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

202

if(buffer == NULL){

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;

203

217

return 0;

204

218

}

219

*buffer = new_buf;

205

220

buffer_capacity += BUFFER_SIZE;

206

221

}

207

222

return buffer_capacity;

208

223

}

209

224

210

225

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

226

__attribute__((nonnull, warn_unused_result))

211

227

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

212

228

int af, server **current_server){

213

229

int ret;

222

238

.af = af };

223

239

if(new_server->ip == NULL){

224

240

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);

225

256

return false;

226

257

}

227

258

/* Special case of first server */

229

260

new_server->next = new_server;

230

261

new_server->prev = new_server;

231

262

*current_server = new_server;

232

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

233

263

} else {

264

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

234

265

new_server->next = *current_server;

235

266

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

236

267

new_server->prev->next = new_server;

237

268

(*current_server)->prev = new_server;

238

269

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

270

return true;

245

271

}

246

272

247

273

/*

248

274

* Initialize GPGME.

249

275

*/

250

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

251

const char *tempdir, mandos_context *mc){

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){

252

281

gpgme_error_t rc;

253

282

gpgme_engine_info_t engine_info;

254

283

255

284

/*

256

285

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

257

286

*/

258

bool import_key(const char *filename){

287

bool import_key(const char * const filename){

259

288

int ret;

260

289

int fd;

261

290

gpgme_data_t pgp_data;

280

309

return false;

281

310

}

282

311

283

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

312

ret = close(fd);

284

313

if(ret == -1){

285

314

perror_plus("close");

286

315

}

342

371

* Decrypt OpenPGP data.

343

372

* Returns -1 on error

344

373

*/

374

__attribute__((nonnull, warn_unused_result))

345

375

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

376

size_t crypto_size,

347

377

char **plaintext,

467

497

return plaintext_length;

468

498

}

469

499

470

static const char * safer_gnutls_strerror(int value){

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){

471

509

const char *ret = gnutls_strerror(value);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

510

return safe_string(ret);

475

511

}

476

512

477

513

/* GnuTLS log function callback */

514

__attribute__((nonnull))

478

515

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

479

516

const char* string){

480

517

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

481

518

}

482

519

520

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

483

521

static int init_gnutls_global(const char *pubkeyfilename,

484

522

const char *seckeyfilename,

523

const char *dhparamsfilename,

485

524

mandos_context *mc){

486

525

int ret;

526

unsigned int uret;

487

527

488

528

if(debug){

489

529

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

490

530

}

491

531

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

532

if(debug){

500

533

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

501

534

* - GnuTLS manual

509

542

if(ret != GNUTLS_E_SUCCESS){

510

543

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

511

544

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

513

545

return -1;

514

546

}

515

547

540

572

safer_gnutls_strerror(ret));

541

573

goto globalfail;

542

574

}

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

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

}

550

747

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

551

748

552

749

return 0;

554

751

globalfail:

555

752

556

753

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

558

754

gnutls_dh_params_deinit(mc->dh_params);

559

755

return -1;

560

756

}

561

757

758

__attribute__((nonnull, warn_unused_result))

562

759

static int init_gnutls_session(gnutls_session_t *session,

563

760

mandos_context *mc){

564

761

int ret;

611

808

/* ignore client certificate if any. */

612

809

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

810

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

616

811

return 0;

617

812

}

618

813

620

815

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

621

816

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

622

817

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

623

1036

/* Called when a Mandos server is found */

1037

__attribute__((nonnull, warn_unused_result))

624

1038

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

625

1039

AvahiIfIndex if_index,

626

1040

int af, mandos_context *mc){

627

1041

int ret, tcp_sd = -1;

628

1042

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1043

struct sockaddr_storage to;

633

1044

char *buffer = NULL;

634

1045

char *decrypted_buffer = NULL;

635

1046

size_t buffer_length = 0;

638

1049

int retval = -1;

639

1050

gnutls_session_t session;

640

1051

int pf; /* Protocol family */

1052

bool route_added = false;

641

1053

642

1054

errno = 0;

643

1055

659

1071

return -1;

660

1072

}

661

1073

1074

/* If the interface is specified and we have a list of interfaces */

1075

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

1076

/* Check if the interface is one of the interfaces we are using */

1077

bool match = false;

1078

{

1079

char *interface = NULL;

1080

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

1081

interface))){

1082

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

1083

match = true;

1084

break;

1085

}

1086

}

1087

}

1088

if(not match){

1089

/* This interface does not match any in the list, so we don't

1090

connect to the server */

1091

if(debug){

1092

char interface[IF_NAMESIZE];

1093

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

1094

perror_plus("if_indextoname");

1095

} else {

1096

fprintf_plus(stderr, "Skipping server on non-used interface"

1097

" \"%s\"\n",

1098

if_indextoname((unsigned int)if_index,

1099

interface));

1100

}

1101

}

1102

return -1;

1103

}

1104

}

1105

662

1106

ret = init_gnutls_session(&session, mc);

663

1107

if(ret != 0){

664

1108

return -1;

669

1113

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

670

1114

}

671

1115

672

tcp_sd = socket(pf, SOCK_STREAM, 0);

1116

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

673

1117

if(tcp_sd < 0){

674

1118

int e = errno;

675

1119

perror_plus("socket");

682

1126

goto mandos_end;

683

1127

}

684

1128

685

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

686

1129

if(af == AF_INET6){

687

to.in6.sin6_family = (sa_family_t)af;

688

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

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);

689

1133

} else { /* IPv4 */

690

to.in.sin_family = (sa_family_t)af;

691

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

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);

692

1137

}

693

1138

if(ret < 0 ){

694

1139

int e = errno;

703

1148

goto mandos_end;

704

1149

}

705

1150

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

707

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

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

709

-Wunreachable-code*/

1151

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

1152

if(IN6_IS_ADDR_LINKLOCAL

1153

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

710

1154

if(if_index == AVAHI_IF_UNSPEC){

711

1155

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

712

1156

" incomplete without a network interface\n");

714

1158

goto mandos_end;

715

1159

}

716

1160

/* Set the network interface number as scope */

717

to.in6.sin6_scope_id = (uint32_t)if_index;

1161

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

718

1162

}

719

1163

} else {

720

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

721

-Wconversion and

722

-Wunreachable-code */

1164

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

723

1165

}

724

1166

725

1167

if(quit_now){

742

1184

}

743

1185

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

1186

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

746

if(af == AF_INET6){

747

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

748

sizeof(addrstr));

749

} else {

750

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

751

sizeof(addrstr));

752

}

753

if(pcret == NULL){

754

perror_plus("inet_ntop");

755

} else {

756

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

757

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

758

}

759

}

760

}

761

762

if(quit_now){

763

errno = EINTR;

764

goto mandos_end;

765

}

766

767

if(af == AF_INET6){

768

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

769

} else {

770

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

771

}

772

if(ret < 0){

773

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

774

int e = errno;

775

perror_plus("connect");

776

errno = e;

777

}

778

goto mandos_end;

779

}

780

781

if(quit_now){

782

errno = EINTR;

783

goto mandos_end;

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

http://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;

784

1267

}

785

1268

786

1269

const char *out = mandos_protocol_version;

969

1452

970

1453

mandos_end:

971

1454

{

1455

if(route_added){

1456

if(not delete_local_route(ip, if_index)){

1457

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

1458

" interface %d", ip, if_index);

1459

}

1460

}

972

1461

int e = errno;

973

1462

free(decrypted_buffer);

974

1463

free(buffer);

975

1464

if(tcp_sd >= 0){

976

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

1465

ret = close(tcp_sd);

977

1466

}

978

1467

if(ret == -1){

979

1468

if(e == 0){

991

1480

return retval;

992

1481

}

993

1482

1483

__attribute__((nonnull))

994

1484

static void resolve_callback(AvahiSServiceResolver *r,

995

1485

AvahiIfIndex interface,

996

1486

AvahiProtocol proto,

1004

1494

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

1495

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1496

flags,

1007

void* mc){

1497

void *mc){

1008

1498

if(r == NULL){

1009

1499

return;

1010

1500

}

1013

1503

timed out */

1014

1504

1015

1505

if(quit_now){

1506

avahi_s_service_resolver_free(r);

1016

1507

return;

1017

1508

}

1018

1509

1063

1554

const char *domain,

1064

1555

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1065

1556

flags,

1066

void* mc){

1557

void *mc){

1067

1558

if(b == NULL){

1068

1559

return;

1069

1560

}

1129

1620

errno = old_errno;

1130

1621

}

1131

1622

1623

__attribute__((nonnull, warn_unused_result))

1132

1624

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

1133

1625

int ret;

1134

error_t ret_errno;

1626

int old_errno;

1135

1627

1136

1628

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

1137

1629

if(s < 0){

1138

ret_errno = errno;

1630

old_errno = errno;

1139

1631

perror_plus("socket");

1140

errno = ret_errno;

1632

errno = old_errno;

1141

1633

return false;

1142

1634

}

1143

strcpy(ifr->ifr_name, ifname);

1635

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

1636

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

1144

1637

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1145

1638

if(ret == -1){

1146

1639

if(debug){

1147

ret_errno = errno;

1640

old_errno = errno;

1148

1641

perror_plus("ioctl SIOCGIFFLAGS");

1149

errno = ret_errno;

1642

errno = old_errno;

1150

1643

}

1151

1644

return false;

1152

1645

}

1153

1646

return true;

1154

1647

}

1155

1648

1649

__attribute__((nonnull, warn_unused_result))

1156

1650

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

1157

1651

1158

1652

/* Reject the loopback device */

1200

1694

* corresponds to an acceptable network device.

1201

1695

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

1202

1696

*/

1697

__attribute__((nonnull, warn_unused_result))

1203

1698

int good_interface(const struct dirent *if_entry){

1204

1699

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

1205

1700

return 0;

1223

1718

/*

1224

1719

* This function determines if a network interface is up.

1225

1720

*/

1721

__attribute__((nonnull, warn_unused_result))

1226

1722

bool interface_is_up(const char *interface){

1227

1723

struct ifreq ifr;

1228

1724

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

1239

1735

/*

1240

1736

* This function determines if a network interface is running

1241

1737

*/

1738

__attribute__((nonnull, warn_unused_result))

1242

1739

bool interface_is_running(const char *interface){

1243

1740

struct ifreq ifr;

1244

1741

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

1252

1749

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

1253

1750

}

1254

1751

1752

__attribute__((nonnull, pure, warn_unused_result))

1255

1753

int notdotentries(const struct dirent *direntry){

1256

1754

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

1257

1755

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

1264

1762

}

1265

1763

1266

1764

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

1765

__attribute__((nonnull, warn_unused_result))

1267

1766

int runnable_hook(const struct dirent *direntry){

1268

1767

int ret;

1269

1768

size_t sret;

1277

1776

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

1278

1777

"abcdefghijklmnopqrstuvwxyz"

1279

1778

"0123456789"

1280

"_-");

1779

"_.-");

1281

1780

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

1282

1781

/* Contains non-allowed characters */

1283

1782

if(debug){

1287

1786

return 0;

1288

1787

}

1289

1788

1290

char *fullname = NULL;

1291

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

1292

if(ret < 0){

1293

perror_plus("asprintf");

1294

return 0;

1295

}

1296

1297

ret = stat(fullname, &st);

1789

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

1298

1790

if(ret == -1){

1299

1791

if(debug){

1300

1792

perror_plus("Could not stat hook");

1324

1816

return 1;

1325

1817

}

1326

1818

1819

__attribute__((nonnull, warn_unused_result))

1327

1820

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1328

1821

mandos_context *mc){

1329

1822

int ret;

1333

1826

1334

1827

while(true){

1335

1828

if(mc->current_server == NULL){

1336

if (debug){

1829

if(debug){

1337

1830

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

1338

1831

" No timeout!\n");

1339

1832

}

1340

1833

ret = avahi_simple_poll_iterate(s, -1);

1341

1834

} else {

1342

if (debug){

1835

if(debug){

1343

1836

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

1344

1837

" it, or wait\n");

1345

1838

}

1362

1855

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

1363

1856

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

1364

1857

1365

if (debug){

1858

if(debug){

1366

1859

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

1367

1860

block_time);

1368

1861

}

1390

1883

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

1391

1884

}

1392

1885

if(ret != 0){

1393

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

1886

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

1394

1887

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

1395

1888

}

1396

1889

}

1397

1890

}

1398

1891

}

1399

1892

1400

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

1401

error_t raise_privileges(void){

1402

error_t old_errno = errno;

1403

error_t ret_errno = 0;

1404

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

1405

ret_errno = errno;

1406

perror_plus("seteuid");

1407

}

1408

errno = old_errno;

1409

return ret_errno;

1410

}

1411

1412

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

1413

error_t raise_privileges_permanently(void){

1414

error_t old_errno = errno;

1415

error_t ret_errno = raise_privileges();

1416

if(ret_errno != 0){

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

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

1421

ret_errno = errno;

1422

perror_plus("seteuid");

1423

}

1424

errno = old_errno;

1425

return ret_errno;

1426

}

1427

1428

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

1429

error_t lower_privileges(void){

1430

error_t old_errno = errno;

1431

error_t ret_errno = 0;

1432

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

1433

ret_errno = errno;

1434

perror_plus("seteuid");

1435

}

1436

errno = old_errno;

1437

return ret_errno;

1438

}

1439

1440

/* Lower privileges permanently */

1441

error_t lower_privileges_permanently(void){

1442

error_t old_errno = errno;

1443

error_t ret_errno = 0;

1444

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

1445

ret_errno = errno;

1446

perror_plus("setuid");

1447

}

1448

errno = old_errno;

1449

return ret_errno;

1450

}

1451

1452

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

1893

__attribute__((nonnull))

1894

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

1453

1895

const float delay){

1454

struct dirent **direntries;

1896

struct dirent **direntries = NULL;

1897

if(hookdir_fd == -1){

1898

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1899

| O_CLOEXEC);

1900

if(hookdir_fd == -1){

1901

if(errno == ENOENT){

1902

if(debug){

1903

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

1904

" found\n", hookdir);

1905

}

1906

} else {

1907

perror_plus("open");

1908

}

1909

return;

1910

}

1911

}

1912

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

1913

runnable_hook, alphasort);

1914

if(numhooks == -1){

1915

perror_plus("scandir");

1916

return;

1917

}

1455

1918

struct dirent *direntry;

1456

1919

int ret;

1457

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

1458

alphasort);

1459

if(numhooks == -1){

1460

if(errno == ENOENT){

1461

if(debug){

1462

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

1463

" found\n", hookdir);

1464

}

1465

} else {

1466

perror_plus("scandir");

1920

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

1921

if(devnull == -1){

1922

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

1923

return;

1924

}

1925

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

1926

direntry = direntries[i];

1927

if(debug){

1928

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

1929

direntry->d_name);

1467

1930

}

1468

} else {

1469

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

1470

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

1471

direntry = direntries[i];

1472

char *fullname = NULL;

1473

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

1474

if(ret < 0){

1931

pid_t hook_pid = fork();

1932

if(hook_pid == 0){

1933

/* Child */

1934

/* Raise privileges */

1935

errno = raise_privileges_permanently();

1936

if(errno != 0){

1937

perror_plus("Failed to raise privileges");

1938

_exit(EX_NOPERM);

1939

}

1940

/* Set group */

1941

errno = 0;

1942

ret = setgid(0);

1943

if(ret == -1){

1944

perror_plus("setgid");

1945

_exit(EX_NOPERM);

1946

}

1947

/* Reset supplementary groups */

1948

errno = 0;

1949

ret = setgroups(0, NULL);

1950

if(ret == -1){

1951

perror_plus("setgroups");

1952

_exit(EX_NOPERM);

1953

}

1954

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

1955

if(ret == -1){

1956

perror_plus("setenv");

1957

_exit(EX_OSERR);

1958

}

1959

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

1960

if(ret == -1){

1961

perror_plus("setenv");

1962

_exit(EX_OSERR);

1963

}

1964

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

1965

if(ret == -1){

1966

perror_plus("setenv");

1967

_exit(EX_OSERR);

1968

}

1969

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

1970

if(ret == -1){

1971

perror_plus("setenv");

1972

_exit(EX_OSERR);

1973

}

1974

char *delaystring;

1975

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

1976

if(ret == -1){

1475

1977

perror_plus("asprintf");

1476

continue;

1477

}

1478

if(debug){

1479

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

1480

direntry->d_name);

1481

}

1482

pid_t hook_pid = fork();

1483

if(hook_pid == 0){

1484

/* Child */

1485

/* Raise privileges */

1486

raise_privileges_permanently();

1487

/* Set group */

1488

errno = 0;

1489

ret = setgid(0);

1490

if(ret == -1){

1491

perror_plus("setgid");

1492

}

1493

/* Reset supplementary groups */

1494

errno = 0;

1495

ret = setgroups(0, NULL);

1496

if(ret == -1){

1497

perror_plus("setgroups");

1498

}

1499

dup2(devnull, STDIN_FILENO);

1500

close(devnull);

1501

dup2(STDERR_FILENO, STDOUT_FILENO);

1502

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

1503

if(ret == -1){

1504

perror_plus("setenv");

1505

_exit(EX_OSERR);

1506

}

1507

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

1508

if(ret == -1){

1509

perror_plus("setenv");

1510

_exit(EX_OSERR);

1511

}

1512

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

1513

if(ret == -1){

1514

perror_plus("setenv");

1515

_exit(EX_OSERR);

1516

}

1517

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

1518

if(ret == -1){

1519

perror_plus("setenv");

1520

_exit(EX_OSERR);

1521

}

1522

char *delaystring;

1523

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

1524

if(ret == -1){

1525

perror_plus("asprintf");

1526

_exit(EX_OSERR);

1527

}

1528

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

1529

if(ret == -1){

1530

free(delaystring);

1531

perror_plus("setenv");

1532

_exit(EX_OSERR);

1533

}

1978

_exit(EX_OSERR);

1979

}

1980

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

1981

if(ret == -1){

1534

1982

free(delaystring);

1535

if(connect_to != NULL){

1536

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

1537

if(ret == -1){

1538

perror_plus("setenv");

1539

_exit(EX_OSERR);

1540

}

1541

}

1542

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

1543

perror_plus("execl");

1544

_exit(EXIT_FAILURE);

1545

}

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

free(delaystring);

1987

if(connect_to != NULL){

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

}

1994

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

1995

direntry->d_name,

1996

O_RDONLY));

1997

if(hook_fd == -1){

1998

perror_plus("openat");

1999

_exit(EXIT_FAILURE);

2000

}

2001

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

2002

perror_plus("close");

2003

_exit(EXIT_FAILURE);

2004

}

2005

ret = dup2(devnull, STDIN_FILENO);

2006

if(ret == -1){

2007

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

2008

_exit(EX_OSERR);

2009

}

2010

ret = close(devnull);

2011

if(ret == -1){

2012

perror_plus("close");

2013

_exit(EX_OSERR);

2014

}

2015

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2016

if(ret == -1){

2017

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

2018

_exit(EX_OSERR);

2019

}

2020

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

2021

environ) == -1){

2022

perror_plus("fexecve");

2023

_exit(EXIT_FAILURE);

2024

}

2025

} else {

2026

if(hook_pid == -1){

2027

perror_plus("fork");

2028

free(direntry);

2029

continue;

2030

}

2031

int status;

2032

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

2033

perror_plus("waitpid");

2034

free(direntry);

2035

continue;

2036

}

2037

if(WIFEXITED(status)){

2038

if(WEXITSTATUS(status) != 0){

2039

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

2040

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

2041

WEXITSTATUS(status));

2042

free(direntry);

2043

continue;

2044

}

2045

} else if(WIFSIGNALED(status)){

2046

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

2047

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

2048

WTERMSIG(status));

2049

free(direntry);

2050

continue;

1546

2051

} else {

1547

int status;

1548

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

1549

perror_plus("waitpid");

1550

free(fullname);

1551

continue;

1552

}

1553

if(WIFEXITED(status)){

1554

if(WEXITSTATUS(status) != 0){

1555

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

1556

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

1557

WEXITSTATUS(status));

1558

free(fullname);

1559

continue;

1560

}

1561

} else if(WIFSIGNALED(status)){

1562

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

1563

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

1564

WTERMSIG(status));

1565

free(fullname);

1566

continue;

1567

} else {

1568

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

1569

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

1570

free(fullname);

1571

continue;

1572

}

1573

}

1574

free(fullname);

1575

if(debug){

1576

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

1577

direntry->d_name);

1578

}

1579

}

1580

close(devnull);

1581

}

1582

return true;

2052

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

2053

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

2054

free(direntry);

2055

continue;

2056

}

2057

}

2058

if(debug){

2059

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

2060

direntry->d_name);

2061

}

2062

free(direntry);

2063

}

2064

free(direntries);

2065

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

2066

perror_plus("close");

2067

} else {

2068

hookdir_fd = -1;

2069

}

2070

close(devnull);

1583

2071

}

1584

2072

1585

error_t bring_up_interface(const char *const interface,

1586

const float delay){

1587

int sd = -1;

1588

error_t old_errno = errno;

1589

error_t ret_errno = 0;

1590

int ret, ret_setflags;

2073

__attribute__((nonnull, warn_unused_result))

2074

int bring_up_interface(const char *const interface,

2075

const float delay){

2076

int old_errno = errno;

2077

int ret;

1591

2078

struct ifreq network;

1592

2079

unsigned int if_index = if_nametoindex(interface);

1593

2080

if(if_index == 0){

1602

2089

}

1603

2090

1604

2091

if(not interface_is_up(interface)){

1605

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

2092

int ret_errno = 0;

2093

int ioctl_errno = 0;

2094

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

1606

2095

ret_errno = errno;

1607

2096

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

1608

2097

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

2098

errno = old_errno;

1609

2099

return ret_errno;

1610

2100

}

1611

network.ifr_flags |= IFF_UP;

2101

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

1612

2102

1613

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1614

if(sd < 0){

2103

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

2104

if(sd == -1){

1615

2105

ret_errno = errno;

1616

2106

perror_plus("socket");

1617

2107

errno = old_errno;

1618

2108

return ret_errno;

1619

2109

}

1620

2110

1621

2111

if(quit_now){

1622

close(sd);

2112

ret = close(sd);

2113

if(ret == -1){

2114

perror_plus("close");

2115

}

1623

2116

errno = old_errno;

1624

2117

return EINTR;

1625

2118

}

1629

2122

interface);

1630

2123

}

1631

2124

1632

/* Raise priviliges */

1633

raise_privileges();

2125

/* Raise privileges */

2126

ret_errno = raise_privileges();

2127

if(ret_errno != 0){

2128

errno = ret_errno;

2129

perror_plus("Failed to raise privileges");

2130

}

1634

2131

1635

2132

#ifdef __linux__

1636

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1637

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

1638

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

1639

bool restore_loglevel = true;

1640

if(ret_linux == -1){

1641

restore_loglevel = false;

1642

perror_plus("klogctl");

2133

int ret_linux;

2134

bool restore_loglevel = false;

2135

if(ret_errno == 0){

2136

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2137

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

2138

ret_linux = klogctl(8, NULL, 5);

2139

if(ret_linux == -1){

2140

perror_plus("klogctl");

2141

} else {

2142

restore_loglevel = true;

2143

}

1643

2144

}

1644

2145

#endif /* __linux__ */

1645

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

1646

ret_errno = errno;

2146

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

2147

ioctl_errno = errno;

1647

2148

#ifdef __linux__

1648

2149

if(restore_loglevel){

1649

2150

ret_linux = klogctl(7, NULL, 0);

1653

2154

}

1654

2155

#endif /* __linux__ */

1655

2156

1656

/* Lower privileges */

1657

lower_privileges();

2157

/* If raise_privileges() succeeded above */

2158

if(ret_errno == 0){

2159

/* Lower privileges */

2160

ret_errno = lower_privileges();

2161

if(ret_errno != 0){

2162

errno = ret_errno;

2163

perror_plus("Failed to lower privileges");

2164

}

2165

}

1658

2166

1659

2167

/* Close the socket */

1660

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

2168

ret = close(sd);

1661

2169

if(ret == -1){

1662

2170

perror_plus("close");

1663

2171

}

1664

2172

1665

2173

if(ret_setflags == -1){

1666

errno = ret_errno;

2174

errno = ioctl_errno;

1667

2175

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1668

2176

errno = old_errno;

1669

return ret_errno;

2177

return ioctl_errno;

1670

2178

}

1671

2179

} else if(debug){

1672

2180

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

1690

2198

return 0;

1691

2199

}

1692

2200

1693

error_t take_down_interface(const char *const interface){

1694

int sd = -1;

1695

error_t old_errno = errno;

1696

error_t ret_errno = 0;

1697

int ret, ret_setflags;

2201

__attribute__((nonnull, warn_unused_result))

2202

int take_down_interface(const char *const interface){

2203

int old_errno = errno;

1698

2204

struct ifreq network;

1699

2205

unsigned int if_index = if_nametoindex(interface);

1700

2206

if(if_index == 0){

1703

2209

return ENXIO;

1704

2210

}

1705

2211

if(interface_is_up(interface)){

2212

int ret_errno = 0;

2213

int ioctl_errno = 0;

1706

2214

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

1707

2215

ret_errno = errno;

1708

2216

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

1709

2217

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

2218

errno = old_errno;

1710

2219

return ret_errno;

1711

2220

}

1712

2221

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

1713

2222

1714

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1715

if(sd < 0){

2223

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

2224

if(sd == -1){

1716

2225

ret_errno = errno;

1717

2226

perror_plus("socket");

1718

2227

errno = old_errno;

1724

2233

interface);

1725

2234

}

1726

2235

1727

/* Raise priviliges */

1728

raise_privileges();

1729

1730

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

1731

ret_errno = errno;

1732

1733

/* Lower privileges */

1734

lower_privileges();

2236

/* Raise privileges */

2237

ret_errno = raise_privileges();

2238

if(ret_errno != 0){

2239

errno = ret_errno;

2240

perror_plus("Failed to raise privileges");

2241

}

2242

2243

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

2244

ioctl_errno = errno;

2245

2246

/* If raise_privileges() succeeded above */

2247

if(ret_errno == 0){

2248

/* Lower privileges */

2249

ret_errno = lower_privileges();

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("Failed to lower privileges");

2253

}

2254

}

1735

2255

1736

2256

/* Close the socket */

1737

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

2257

int ret = close(sd);

1738

2258

if(ret == -1){

1739

2259

perror_plus("close");

1740

2260

}

1741

2261

1742

2262

if(ret_setflags == -1){

1743

errno = ret_errno;

2263

errno = ioctl_errno;

1744

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1745

2265

errno = old_errno;

1746

return ret_errno;

2266

return ioctl_errno;

1747

2267

}

1748

2268

} else if(debug){

1749

2269

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

1755

2275

}

1756

2276

1757

2277

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

1758

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

1759

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

1760

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

1761

.interfaces = NULL, .interfaces_size = 0 };

2278

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

2279

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

2280

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

2281

.current_server = NULL, .interfaces = NULL,

2282

.interfaces_size = 0 };

1762

2283

AvahiSServiceBrowser *sb = NULL;

1763

2284

error_t ret_errno;

1764

2285

int ret;

1767

2288

int exitcode = EXIT_SUCCESS;

1768

2289

char *interfaces_to_take_down = NULL;

1769

2290

size_t interfaces_to_take_down_size = 0;

1770

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

1771

bool tempdir_created = false;

2291

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

2292

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

2293

char *tempdir = NULL;

1772

2294

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1773

2295

const char *seckey = PATHDIR "/" SECKEY;

1774

2296

const char *pubkey = PATHDIR "/" PUBKEY;

2297

const char *dh_params_file = NULL;

1775

2298

char *interfaces_hooks = NULL;

1776

size_t interfaces_hooks_size = 0;

1777

2299

1778

2300

bool gnutls_initialized = false;

1779

2301

bool gpgme_initialized = false;

1831

2353

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

1832

2354

" Diffie-Hellman key exchange",

1833

2355

.group = 2 },

2356

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

2357

.arg = "FILE",

2358

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

2359

" for the Diffie-Hellman key exchange",

2360

.group = 2 },

1834

2361

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

1835

2362

.arg = "STRING",

1836

2363

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

1891

2418

}

1892

2419

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

1893

2420

break;

2421

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

2422

dh_params_file = arg;

2423

break;

1894

2424

case 130: /* --priority */

1895

2425

mc.priority = arg;

1896

2426

break;

1936

2466

.args_doc = "",

1937

2467

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

1938

2468

" passwords from a Mandos server" };

1939

ret = argp_parse(&argp, argc, argv,

1940

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1941

switch(ret){

2469

ret_errno = argp_parse(&argp, argc, argv,

2470

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2471

switch(ret_errno){

1942

2472

case 0:

1943

2473

break;

1944

2474

case ENOMEM:

1945

2475

default:

1946

errno = ret;

2476

errno = ret_errno;

1947

2477

perror_plus("argp_parse");

1948

2478

exitcode = EX_OSERR;

1949

2479

goto end;

1952

2482

goto end;

1953

2483

}

1954

2484

}

1955

2485

1956

2486

{

1957

2487

/* Work around Debian bug #633582:

1958

2488

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

1959

2489

1960

/* Re-raise priviliges */

1961

if(raise_privileges() == 0){

2490

/* Re-raise privileges */

2491

ret = raise_privileges();

2492

if(ret != 0){

2493

errno = ret;

2494

perror_plus("Failed to raise privileges");

2495

} else {

1962

2496

struct stat st;

1963

2497

1964

2498

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

1978

2512

}

1979

2513

}

1980

2514

}

1981

TEMP_FAILURE_RETRY(close(seckey_fd));

2515

close(seckey_fd);

1982

2516

}

1983

2517

}

1984

2518

1985

2519

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

1986

2520

int pubkey_fd = open(pubkey, O_RDONLY);

1987

2521

if(pubkey_fd == -1){

1999

2533

}

2000

2534

}

2001

2535

}

2002

TEMP_FAILURE_RETRY(close(pubkey_fd));

2003

}

2004

}

2005

2536

close(pubkey_fd);

2537

}

2538

}

2539

2540

if(dh_params_file != NULL

2541

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

2542

int dhparams_fd = open(dh_params_file, O_RDONLY);

2543

if(dhparams_fd == -1){

2544

perror_plus("open");

2545

} else {

2546

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

2547

if(ret == -1){

2548

perror_plus("fstat");

2549

} else {

2550

if(S_ISREG(st.st_mode)

2551

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

2552

ret = fchown(dhparams_fd, uid, gid);

2553

if(ret == -1){

2554

perror_plus("fchown");

2555

}

2556

}

2557

}

2558

close(dhparams_fd);

2559

}

2560

}

2561

2006

2562

/* Lower privileges */

2007

errno = 0;

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2563

ret = lower_privileges();

2564

if(ret != 0){

2565

errno = ret;

2566

perror_plus("Failed to lower privileges");

2011

2567

}

2012

2568

}

2013

2569

}

2014

2570

2015

/* Remove empty interface names */

2571

/* Remove invalid interface names (except "none") */

2016

2572

{

2017

2573

char *interface = NULL;

2018

2574

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2019

2575

interface))){

2020

if(if_nametoindex(interface) == 0){

2021

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2576

if(strcmp(interface, "none") != 0

2577

and if_nametoindex(interface) == 0){

2578

if(interface[0] != '\0'){

2022

2579

fprintf_plus(stderr, "Not using nonexisting interface"

2023

2580

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

2024

2581

}

2030

2587

2031

2588

/* Run network hooks */

2032

2589

{

2033

2034

2590

if(mc.interfaces != NULL){

2035

2591

interfaces_hooks = malloc(mc.interfaces_size);

2036

2592

if(interfaces_hooks == NULL){

2038

2594

goto end;

2039

2595

}

2040

2596

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

2041

interfaces_hooks_size = mc.interfaces_size;

2042

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2043

(int)',');

2044

}

2045

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

2046

interfaces_hooks : "", delay)){

2047

goto end;

2048

}

2597

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

2598

}

2599

run_network_hooks("start", interfaces_hooks != NULL ?

2600

interfaces_hooks : "", delay);

2049

2601

}

2050

2602

2051

2603

if(not debug){

2129

2681

2130

2682

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

2131

2683

if(mc.interfaces == NULL){

2132

struct dirent **direntries;

2684

struct dirent **direntries = NULL;

2133

2685

/* Look for any good interfaces */

2134

2686

ret = scandir(sys_class_net, &direntries, good_interface,

2135

2687

alphasort);

2139

2691

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

2140

2692

direntries[i]->d_name);

2141

2693

if(ret_errno != 0){

2694

errno = ret_errno;

2142

2695

perror_plus("argz_add");

2696

free(direntries[i]);

2143

2697

continue;

2144

2698

}

2145

2699

if(debug){

2146

2700

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

2147

2701

direntries[i]->d_name);

2148

2702

}

2703

free(direntries[i]);

2149

2704

}

2150

2705

free(direntries);

2151

2706

} else {

2152

free(direntries);

2707

if(ret == 0){

2708

free(direntries);

2709

}

2153

2710

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

2154

2711

exitcode = EXIT_FAILURE;

2155

2712

goto end;

2156

2713

}

2157

2714

}

2158

2715

2716

/* Bring up interfaces which are down, and remove any "none"s */

2717

{

2718

char *interface = NULL;

2719

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2720

interface))){

2721

/* If interface name is "none", stop bringing up interfaces.

2722

Also remove all instances of "none" from the list */

2723

if(strcmp(interface, "none") == 0){

2724

argz_delete(&mc.interfaces, &mc.interfaces_size,

2725

interface);

2726

interface = NULL;

2727

while((interface = argz_next(mc.interfaces,

2728

mc.interfaces_size, interface))){

2729

if(strcmp(interface, "none") == 0){

2730

argz_delete(&mc.interfaces, &mc.interfaces_size,

2731

interface);

2732

interface = NULL;

2733

}

2734

}

2735

break;

2736

}

2737

bool interface_was_up = interface_is_up(interface);

2738

errno = bring_up_interface(interface, delay);

2739

if(not interface_was_up){

2740

if(errno != 0){

2741

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

2742

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

2743

} else {

2744

errno = argz_add(&interfaces_to_take_down,

2745

&interfaces_to_take_down_size,

2746

interface);

2747

if(errno != 0){

2748

perror_plus("argz_add");

2749

}

2750

}

2751

}

2752

}

2753

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

2754

fprintf_plus(stderr, "No interfaces were brought up\n");

2755

}

2756

}

2757

2159

2758

/* If we only got one interface, explicitly use only that one */

2160

2759

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2161

2760

if(debug){

2165

2764

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

2166

2765

}

2167

2766

2168

/* Bring up interfaces which are down */

2169

if(not (argz_count(mc.interfaces, mc.interfaces_size) == 1

2170

and strcmp(mc.interfaces, "none") == 0)){

2171

char *interface = NULL;

2172

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2173

interface))){

2174

bool interface_was_up = interface_is_up(interface);

2175

ret = bring_up_interface(interface, delay);

2176

if(not interface_was_up){

2177

if(ret != 0){

2178

errno = ret;

2179

perror_plus("Failed to bring up interface");

2180

} else {

2181

ret_errno = argz_add(&interfaces_to_take_down,

2182

&interfaces_to_take_down_size,

2183

interface);

2184

}

2185

}

2186

}

2187

free(mc.interfaces);

2188

mc.interfaces = NULL;

2189

mc.interfaces_size = 0;

2190

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

2191

fprintf_plus(stderr, "No interfaces were brought up\n");

2192

}

2193

}

2194

2195

2767

if(quit_now){

2196

2768

goto end;

2197

2769

}

2198

2770

2199

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

2771

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

2200

2772

if(ret == -1){

2201

2773

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

2202

2774

exitcode = EX_UNAVAILABLE;

2209

2781

goto end;

2210

2782

}

2211

2783

2212

if(mkdtemp(tempdir) == NULL){

2784

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

2785

tempdir = mkdtemp(run_tempdir);

2786

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

2787

if(debug){

2788

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

2789

run_tempdir, old_tempdir);

2790

}

2791

tempdir = mkdtemp(old_tempdir);

2792

}

2793

if(tempdir == NULL){

2213

2794

perror_plus("mkdtemp");

2214

2795

goto end;

2215

2796

}

2216

tempdir_created = true;

2217

2797

2218

2798

if(quit_now){

2219

2799

goto end;

2255

2835

exitcode = EX_USAGE;

2256

2836

goto end;

2257

2837

}

2258

2838

2259

2839

if(quit_now){

2260

2840

goto end;

2261

2841

}

2291

2871

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

2292

2872

(int)retry_interval);

2293

2873

}

2294

sleep((int)retry_interval);

2874

sleep((unsigned int)retry_interval);

2295

2875

}

2296

2876

2297

if (not quit_now){

2877

if(not quit_now){

2298

2878

exitcode = EXIT_SUCCESS;

2299

2879

}

2300

2880

2316

2896

2317

2897

/* Allocate a new server */

2318

2898

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2319

&config, NULL, NULL, &ret_errno);

2899

&config, NULL, NULL, &ret);

2320

2900

2321

2901

/* Free the Avahi configuration data */

2322

2902

avahi_server_config_free(&config);

2325

2905

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

2326

2906

if(mc.server == NULL){

2327

2907

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

2328

avahi_strerror(ret_errno));

2908

avahi_strerror(ret));

2329

2909

exitcode = EX_UNAVAILABLE;

2330

2910

goto end;

2331

2911

}

2355

2935

if(debug){

2356

2936

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

2357

2937

}

2358

2938

2359

2939

ret = avahi_loop_with_timeout(simple_poll,

2360

2940

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

2361

2941

if(debug){

2370

2950

}

2371

2951

2372

2952

/* Cleanup things */

2953

free(mc.interfaces);

2954

2373

2955

if(sb != NULL)

2374

2956

avahi_s_service_browser_free(sb);

2375

2957

2381

2963

2382

2964

if(gnutls_initialized){

2383

2965

gnutls_certificate_free_credentials(mc.cred);

2384

gnutls_global_deinit();

2385

2966

gnutls_dh_params_deinit(mc.dh_params);

2386

2967

}

2387

2968

2395

2976

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

2396

2977

while(mc.current_server != NULL){

2397

2978

server *next = mc.current_server->next;

2979

#ifdef __GNUC__

2980

#pragma GCC diagnostic push

2981

#pragma GCC diagnostic ignored "-Wcast-qual"

2982

#endif

2983

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

2984

#ifdef __GNUC__

2985

#pragma GCC diagnostic pop

2986

#endif

2398

2987

free(mc.current_server);

2399

2988

mc.current_server = next;

2400

2989

}

2401

2990

}

2402

2991

2403

/* Re-raise priviliges */

2992

/* Re-raise privileges */

2404

2993

{

2405

raise_privileges();

2406

2407

/* Run network hooks */

2408

run_network_hooks("stop", interfaces_hooks != NULL ?

2409

interfaces_hooks : "", delay);

2410

2411

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

2412

{

2413

char *interface = NULL;

2414

while((interface=argz_next(interfaces_to_take_down,

2415

interfaces_to_take_down_size,

2416

interface))){

2417

ret_errno = take_down_interface(interface);

2418

if(ret_errno != 0){

2419

errno = ret_errno;

2420

perror_plus("Failed to take down interface");

2421

}

2422

}

2423

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

2424

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

2425

" down\n");

2426

}

2427

}

2428

2429

lower_privileges_permanently();

2994

ret = raise_privileges();

2995

if(ret != 0){

2996

errno = ret;

2997

perror_plus("Failed to raise privileges");

2998

} else {

2999

3000

/* Run network hooks */

3001

run_network_hooks("stop", interfaces_hooks != NULL ?

3002

interfaces_hooks : "", delay);

3003

3004

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

3005

{

3006

char *interface = NULL;

3007

while((interface=argz_next(interfaces_to_take_down,

3008

interfaces_to_take_down_size,

3009

interface))){

3010

ret = take_down_interface(interface);

3011

if(ret != 0){

3012

errno = ret;

3013

perror_plus("Failed to take down interface");

3014

}

3015

}

3016

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

3017

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

3018

" down\n");

3019

}

3020

}

3021

}

3022

3023

ret = lower_privileges_permanently();

3024

if(ret != 0){

3025

errno = ret;

3026

perror_plus("Failed to lower privileges permanently");

3027

}

2430

3028

}

2431

3029

2432

3030

free(interfaces_to_take_down);

2433

3031

free(interfaces_hooks);

2434

3032

3033

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

3034

uintmax_t level){

3035

struct dirent **direntries = NULL;

3036

int dret;

3037

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

3038

O_RDONLY

3039

| O_NOFOLLOW

3040

| O_DIRECTORY

3041

| O_PATH));

3042

if(dir_fd == -1){

3043

perror_plus("open");

3044

}

3045

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

3046

notdotentries, alphasort);

3047

if(numentries >= 0){

3048

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

3049

if(debug){

3050

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

3051

dirname, direntries[i]->d_name);

3052

}

3053

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

3054

if(dret == -1){

3055

if(errno == EISDIR){

3056

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

3057

AT_REMOVEDIR);

3058

}

3059

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

3060

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

3061

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

3062

/* Recurse only in this special case */

3063

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

3064

dret = 0;

3065

}

3066

if(dret == -1){

3067

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

3068

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

3069

}

3070

}

3071

free(direntries[i]);

3072

}

3073

3074

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

3075

free(direntries);

3076

if(numentries == -1){

3077

perror_plus("scandirat");

3078

}

3079

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3080

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

3081

perror_plus("rmdir");

3082

}

3083

} else {

3084

perror_plus("scandirat");

3085

}

3086

close(dir_fd);

3087

}

3088

2435

3089

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

2436

if(tempdir_created){

2437

struct dirent **direntries = NULL;

2438

struct dirent *direntry = NULL;

2439

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

2440

alphasort);

2441

if (numentries > 0){

2442

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

2443

direntry = direntries[i];

2444

char *fullname = NULL;

2445

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

2446

direntry->d_name);

2447

if(ret < 0){

2448

perror_plus("asprintf");

2449

continue;

2450

}

2451

ret = remove(fullname);

2452

if(ret == -1){

2453

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

2454

strerror(errno));

2455

}

2456

free(fullname);

2457

}

2458

}

2459

2460

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

2461

free(direntries);

2462

if (numentries == -1){

2463

perror_plus("scandir");

2464

}

2465

ret = rmdir(tempdir);

2466

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

2467

perror_plus("rmdir");

2468

}

3090

if(tempdir != NULL){

3091

clean_dir_at(-1, tempdir, 0);

2469

3092

}

2470

3093

2471

3094

if(quit_now){