/mandos/trunk : revision 602

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

170

161

const char *priority;

171

162

gpgme_ctx_t ctx;

172

163

server *current_server;

173

char *interfaces;

174

size_t interfaces_size;

175

164

} mandos_context;

176

165

177

166

/* global so signal handler can reach it*/

189

178

perror(print_text);

190

179

}

191

180

192

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

181

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

193

182

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

194

183

va_list ap;

195

184

va_start (ap, format);

196

185

197

186

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

198

187

program_invocation_short_name));

199

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

188

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

200

189

}

201

190

202

191

/*

204

193

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

205

194

* "buffer_length" is how much is already used.

206

195

*/

207

__attribute__((nonnull, warn_unused_result))

208

196

size_t incbuffer(char **buffer, size_t buffer_length,

209

197

size_t buffer_capacity){

210

198

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;

199

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

200

if(buffer == NULL){

217

201

return 0;

218

202

}

219

*buffer = new_buf;

220

203

buffer_capacity += BUFFER_SIZE;

221

204

}

222

205

return buffer_capacity;

223

206

}

224

207

225

208

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

226

__attribute__((nonnull, warn_unused_result))

227

209

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

228

210

int af, server **current_server){

229

211

int ret;

238

220

.af = af };

239

221

if(new_server->ip == NULL){

240

222

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

223

return false;

257

224

}

258

225

/* Special case of first server */

260

227

new_server->next = new_server;

261

228

new_server->prev = new_server;

262

229

*current_server = new_server;

230

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

263

231

} else {

264

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

265

232

new_server->next = *current_server;

266

233

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

267

234

new_server->prev->next = new_server;

268

235

(*current_server)->prev = new_server;

269

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

270

242

return true;

271

243

}

272

244

273

245

/*

274

246

* Initialize GPGME.

275

247

*/

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){

248

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

249

const char *tempdir, mandos_context *mc){

281

250

gpgme_error_t rc;

282

251

gpgme_engine_info_t engine_info;

283

252

284

253

/*

285

254

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

286

255

*/

287

bool import_key(const char * const filename){

256

bool import_key(const char *filename){

288

257

int ret;

289

258

int fd;

290

259

gpgme_data_t pgp_data;

309

278

return false;

310

279

}

311

280

312

ret = close(fd);

281

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

313

282

if(ret == -1){

314

283

perror_plus("close");

315

284

}

371

340

* Decrypt OpenPGP data.

372

341

* Returns -1 on error

373

342

*/

374

__attribute__((nonnull, warn_unused_result))

375

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

376

344

size_t crypto_size,

377

345

char **plaintext,

497

465

return plaintext_length;

498

466

}

499

467

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){

468

static const char * safer_gnutls_strerror(int value){

509

469

const char *ret = gnutls_strerror(value);

510

return safe_string(ret);

470

if(ret == NULL)

471

ret = "(unknown)";

472

return ret;

511

473

}

512

474

513

475

/* GnuTLS log function callback */

514

__attribute__((nonnull))

515

476

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

516

477

const char* string){

517

478

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

518

479

}

519

480

520

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

521

481

static int init_gnutls_global(const char *pubkeyfilename,

522

482

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

483

mandos_context *mc){

525

484

int ret;

526

unsigned int uret;

527

485

528

486

if(debug){

529

487

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

530

488

}

531

489

490

ret = gnutls_global_init();

491

if(ret != GNUTLS_E_SUCCESS){

492

fprintf_plus(stderr, "GnuTLS global_init: %s\n",

493

safer_gnutls_strerror(ret));

494

return -1;

495

}

496

532

497

if(debug){

533

498

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

534

499

* - GnuTLS manual

542

507

if(ret != GNUTLS_E_SUCCESS){

543

508

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

544

509

safer_gnutls_strerror(ret));

510

gnutls_global_deinit();

545

511

return -1;

546

512

}

547

513

572

538

safer_gnutls_strerror(ret));

573

539

goto globalfail;

574

540

}

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

}

541

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

542

if(ret != GNUTLS_E_SUCCESS){

543

fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",

544

safer_gnutls_strerror(ret));

545

goto globalfail;

546

}

547

747

548

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

748

549

749

550

return 0;

751

552

globalfail:

752

553

753

554

gnutls_certificate_free_credentials(mc->cred);

555

gnutls_global_deinit();

754

556

gnutls_dh_params_deinit(mc->dh_params);

755

557

return -1;

756

558

}

757

559

758

__attribute__((nonnull, warn_unused_result))

759

560

static int init_gnutls_session(gnutls_session_t *session,

760

561

mandos_context *mc){

761

562

int ret;

808

609

/* ignore client certificate if any. */

809

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

611

612

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

613

811

614

return 0;

812

615

}

813

616

815

618

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

816

619

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

817

620

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

621

/* Called when a Mandos server is found */

1037

__attribute__((nonnull, warn_unused_result))

1038

622

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

1039

623

AvahiIfIndex if_index,

1040

624

int af, mandos_context *mc){

1041

625

int ret, tcp_sd = -1;

1042

626

ssize_t sret;

1043

struct sockaddr_storage to;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

1044

631

char *buffer = NULL;

1045

632

char *decrypted_buffer = NULL;

1046

633

size_t buffer_length = 0;

1049

636

int retval = -1;

1050

637

gnutls_session_t session;

1051

638

int pf; /* Protocol family */

1052

bool route_added = false;

1053

639

1054

640

errno = 0;

1055

641

1071

657

return -1;

1072

658

}

1073

659

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

1106

660

ret = init_gnutls_session(&session, mc);

1107

661

if(ret != 0){

1108

662

return -1;

1113

667

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

1114

668

}

1115

669

1116

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

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

671

if(tcp_sd < 0){

1118

672

int e = errno;

1119

673

perror_plus("socket");

1126

680

goto mandos_end;

1127

681

}

1128

682

683

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

1129

684

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);

685

to.in6.sin6_family = (sa_family_t)af;

686

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

1133

687

} 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);

688

to.in.sin_family = (sa_family_t)af;

689

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

1137

690

}

1138

691

if(ret < 0 ){

1139

692

int e = errno;

1148

701

goto mandos_end;

1149

702

}

1150

703

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)){

704

to.in6.sin6_port = htons(port);

705

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

706

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

707

-Wunreachable-code*/

1154

708

if(if_index == AVAHI_IF_UNSPEC){

1155

709

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

1156

710

" incomplete without a network interface\n");

1158

712

goto mandos_end;

1159

713

}

1160

714

/* Set the network interface number as scope */

1161

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

715

to.in6.sin6_scope_id = (uint32_t)if_index;

1162

716

}

1163

717

} else {

1164

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

718

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

719

-Wconversion and

720

-Wunreachable-code */

1165

721

}

1166

722

1167

723

if(quit_now){

1184

740

}

1185

741

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1186

742

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

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;

743

const char *pcret;

744

if(af == AF_INET6){

745

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

746

sizeof(addrstr));

747

} else {

748

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

749

sizeof(addrstr));

750

}

751

if(pcret == NULL){

752

perror_plus("inet_ntop");

753

} else {

754

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

755

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

756

}

757

}

758

}

759

760

if(quit_now){

761

errno = EINTR;

762

goto mandos_end;

763

}

764

765

if(af == AF_INET6){

766

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

767

} else {

768

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

769

}

770

if(ret < 0){

771

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

772

int e = errno;

773

perror_plus("connect");

774

errno = e;

775

}

776

goto mandos_end;

777

}

778

779

if(quit_now){

780

errno = EINTR;

781

goto mandos_end;

1267

782

}

1268

783

1269

784

const char *out = mandos_protocol_version;

1452

967

1453

968

mandos_end:

1454

969

{

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

}

1461

970

int e = errno;

1462

971

free(decrypted_buffer);

1463

972

free(buffer);

1464

973

if(tcp_sd >= 0){

1465

ret = close(tcp_sd);

974

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

1466

975

}

1467

976

if(ret == -1){

1468

977

if(e == 0){

1480

989

return retval;

1481

990

}

1482

991

1483

__attribute__((nonnull))

1484

992

static void resolve_callback(AvahiSServiceResolver *r,

1485

993

AvahiIfIndex interface,

1486

994

AvahiProtocol proto,

1494

1002

AVAHI_GCC_UNUSED AvahiStringList *txt,

1495

1003

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1496

1004

flags,

1497

void *mc){

1005

void* mc){

1498

1006

if(r == NULL){

1499

1007

return;

1500

1008

}

1503

1011

timed out */

1504

1012

1505

1013

if(quit_now){

1506

avahi_s_service_resolver_free(r);

1507

1014

return;

1508

1015

}

1509

1016

1554

1061

const char *domain,

1555

1062

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1556

1063

flags,

1557

void *mc){

1064

void* mc){

1558

1065

if(b == NULL){

1559

1066

return;

1560

1067

}

1620

1127

errno = old_errno;

1621

1128

}

1622

1129

1623

__attribute__((nonnull, warn_unused_result))

1624

1130

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

1625

1131

int ret;

1626

int old_errno;

1132

error_t ret_errno;

1627

1133

1628

1134

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

1629

1135

if(s < 0){

1630

old_errno = errno;

1136

ret_errno = errno;

1631

1137

perror_plus("socket");

1632

errno = old_errno;

1138

errno = ret_errno;

1633

1139

return false;

1634

1140

}

1635

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

1636

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

1141

strcpy(ifr->ifr_name, ifname);

1637

1142

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1638

1143

if(ret == -1){

1639

1144

if(debug){

1640

old_errno = errno;

1145

ret_errno = errno;

1641

1146

perror_plus("ioctl SIOCGIFFLAGS");

1642

errno = old_errno;

1147

errno = ret_errno;

1643

1148

}

1644

1149

return false;

1645

1150

}

1646

1151

return true;

1647

1152

}

1648

1153

1649

__attribute__((nonnull, warn_unused_result))

1650

1154

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

1651

1155

1652

1156

/* Reject the loopback device */

1694

1198

* corresponds to an acceptable network device.

1695

1199

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

1696

1200

*/

1697

__attribute__((nonnull, warn_unused_result))

1698

1201

int good_interface(const struct dirent *if_entry){

1699

1202

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

1700

1203

return 0;

1718

1221

/*

1719

1222

* This function determines if a network interface is up.

1720

1223

*/

1721

__attribute__((nonnull, warn_unused_result))

1722

1224

bool interface_is_up(const char *interface){

1723

1225

struct ifreq ifr;

1724

1226

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

1735

1237

/*

1736

1238

* This function determines if a network interface is running

1737

1239

*/

1738

__attribute__((nonnull, warn_unused_result))

1739

1240

bool interface_is_running(const char *interface){

1740

1241

struct ifreq ifr;

1741

1242

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

1749

1250

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

1750

1251

}

1751

1252

1752

__attribute__((nonnull, pure, warn_unused_result))

1753

1253

int notdotentries(const struct dirent *direntry){

1754

1254

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

1755

1255

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

1762

1262

}

1763

1263

1764

1264

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

1765

__attribute__((nonnull, warn_unused_result))

1766

1265

int runnable_hook(const struct dirent *direntry){

1767

1266

int ret;

1768

1267

size_t sret;

1776

1275

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

1777

1276

"abcdefghijklmnopqrstuvwxyz"

1778

1277

"0123456789"

1779

"_.-");

1278

"_-");

1780

1279

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

1781

1280

/* Contains non-allowed characters */

1782

1281

if(debug){

1786

1285

return 0;

1787

1286

}

1788

1287

1789

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

1288

char *fullname = NULL;

1289

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

1290

if(ret < 0){

1291

perror_plus("asprintf");

1292

return 0;

1293

}

1294

1295

ret = stat(fullname, &st);

1790

1296

if(ret == -1){

1791

1297

if(debug){

1792

1298

perror_plus("Could not stat hook");

1816

1322

return 1;

1817

1323

}

1818

1324

1819

__attribute__((nonnull, warn_unused_result))

1820

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1821

1326

mandos_context *mc){

1822

1327

int ret;

1826

1331

1827

1332

while(true){

1828

1333

if(mc->current_server == NULL){

1829

if(debug){

1334

if (debug){

1830

1335

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

1831

1336

" No timeout!\n");

1832

1337

}

1833

1338

ret = avahi_simple_poll_iterate(s, -1);

1834

1339

} else {

1835

if(debug){

1340

if (debug){

1836

1341

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

1837

1342

" it, or wait\n");

1838

1343

}

1855

1360

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

1856

1361

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

1857

1362

1858

if(debug){

1363

if (debug){

1859

1364

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

1860

1365

block_time);

1861

1366

}

1883

1388

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

1884

1389

}

1885

1390

if(ret != 0){

1886

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

1391

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

1887

1392

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

1888

1393

}

1889

1394

}

1890

1395

}

1891

1396

}

1892

1397

1893

__attribute__((nonnull))

1894

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

1398

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

1399

error_t raise_privileges(void){

1400

error_t old_errno = errno;

1401

error_t ret_errno = 0;

1402

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

1403

ret_errno = errno;

1404

perror_plus("seteuid");

1405

}

1406

errno = old_errno;

1407

return ret_errno;

1408

}

1409

1410

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

1411

error_t raise_privileges_permanently(void){

1412

error_t old_errno = errno;

1413

error_t ret_errno = raise_privileges();

1414

if(ret_errno != 0){

1415

errno = old_errno;

1416

return ret_errno;

1417

}

1418

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

1419

ret_errno = errno;

1420

perror_plus("seteuid");

1421

}

1422

errno = old_errno;

1423

return ret_errno;

1424

}

1425

1426

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

1427

error_t lower_privileges(void){

1428

error_t old_errno = errno;

1429

error_t ret_errno = 0;

1430

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

1431

ret_errno = errno;

1432

perror_plus("seteuid");

1433

}

1434

errno = old_errno;

1435

return ret_errno;

1436

}

1437

1438

/* Lower privileges permanently */

1439

error_t lower_privileges_permanently(void){

1440

error_t old_errno = errno;

1441

error_t ret_errno = 0;

1442

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

1443

ret_errno = errno;

1444

perror_plus("setuid");

1445

}

1446

errno = old_errno;

1447

return ret_errno;

1448

}

1449

1450

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

1895

1451

const float delay){

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);

1452

struct dirent **direntries;

1453

struct dirent *direntry;

1454

int ret;

1455

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

1456

alphasort);

1914

1457

if(numhooks == -1){

1915

perror_plus("scandir");

1916

return;

1917

}

1918

struct dirent *direntry;

1919

int ret;

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);

1458

if(errno == ENOENT){

1459

if(debug){

1460

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

1461

" found\n", hookdir);

1462

}

1463

} else {

1464

perror_plus("scandir");

1930

1465

}

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){

1466

} else {

1467

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

1468

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

1469

direntry = direntries[i];

1470

char *fullname = NULL;

1471

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

1472

if(ret < 0){

1977

1473

perror_plus("asprintf");

1978

_exit(EX_OSERR);

1979

}

1980

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

1981

if(ret == -1){

1474

continue;

1475

}

1476

if(debug){

1477

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

1478

direntry->d_name);

1479

}

1480

pid_t hook_pid = fork();

1481

if(hook_pid == 0){

1482

/* Child */

1483

/* Raise privileges */

1484

raise_privileges_permanently();

1485

/* Set group */

1486

errno = 0;

1487

ret = setgid(0);

1488

if(ret == -1){

1489

perror_plus("setgid");

1490

}

1491

/* Reset supplementary groups */

1492

errno = 0;

1493

ret = setgroups(0, NULL);

1494

if(ret == -1){

1495

perror_plus("setgroups");

1496

}

1497

dup2(devnull, STDIN_FILENO);

1498

close(devnull);

1499

dup2(STDERR_FILENO, STDOUT_FILENO);

1500

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

1501

if(ret == -1){

1502

perror_plus("setenv");

1503

_exit(EX_OSERR);

1504

}

1505

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

1506

if(ret == -1){

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

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

1511

if(ret == -1){

1512

perror_plus("setenv");

1513

_exit(EX_OSERR);

1514

}

1515

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

1516

if(ret == -1){

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

char *delaystring;

1521

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

1522

if(ret == -1){

1523

perror_plus("asprintf");

1524

_exit(EX_OSERR);

1525

}

1526

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

1527

if(ret == -1){

1528

free(delaystring);

1529

perror_plus("setenv");

1530

_exit(EX_OSERR);

1531

}

1982

1532

free(delaystring);

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;

1533

if(connect_to != NULL){

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

}

1540

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

1541

perror_plus("execl");

1542

_exit(EXIT_FAILURE);

1543

}

2051

1544

} else {

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);

1545

int status;

1546

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

1547

perror_plus("waitpid");

1548

free(fullname);

1549

continue;

1550

}

1551

if(WIFEXITED(status)){

1552

if(WEXITSTATUS(status) != 0){

1553

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

1554

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

1555

WEXITSTATUS(status));

1556

free(fullname);

1557

continue;

1558

}

1559

} else if(WIFSIGNALED(status)){

1560

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

1561

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

1562

WTERMSIG(status));

1563

free(fullname);

1564

continue;

1565

} else {

1566

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

1567

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

1568

free(fullname);

1569

continue;

1570

}

1571

}

1572

free(fullname);

1573

if(debug){

1574

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

1575

direntry->d_name);

1576

}

1577

}

1578

close(devnull);

1579

}

1580

return true;

2071

1581

}

2072

1582

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;

1583

error_t bring_up_interface(const char *const interface,

1584

const float delay){

1585

int sd = -1;

1586

error_t old_errno = errno;

1587

error_t ret_errno = 0;

1588

int ret, ret_setflags;

2078

1589

struct ifreq network;

2079

1590

unsigned int if_index = if_nametoindex(interface);

2080

1591

if(if_index == 0){

2089

1600

}

2090

1601

2091

1602

if(not interface_is_up(interface)){

2092

int ret_errno = 0;

2093

int ioctl_errno = 0;

2094

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

1603

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

2095

1604

ret_errno = errno;

2096

1605

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

2097

1606

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

2098

errno = old_errno;

2099

1607

return ret_errno;

2100

1608

}

2101

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

1609

network.ifr_flags |= IFF_UP;

2102

1610

2103

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

2104

if(sd == -1){

1611

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1612

if(sd < 0){

2105

1613

ret_errno = errno;

2106

1614

perror_plus("socket");

2107

1615

errno = old_errno;

2108

1616

return ret_errno;

2109

1617

}

2110

1618

2111

1619

if(quit_now){

2112

ret = close(sd);

2113

if(ret == -1){

2114

perror_plus("close");

2115

}

1620

close(sd);

2116

1621

errno = old_errno;

2117

1622

return EINTR;

2118

1623

}

2122

1627

interface);

2123

1628

}

2124

1629

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

}

1630

/* Raise priviliges */

1631

raise_privileges();

2131

1632

2132

1633

#ifdef __linux__

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

}

1634

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1635

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

1636

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

1637

bool restore_loglevel = true;

1638

if(ret_linux == -1){

1639

restore_loglevel = false;

1640

perror_plus("klogctl");

2144

1641

}

2145

1642

#endif /* __linux__ */

2146

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

2147

ioctl_errno = errno;

1643

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

1644

ret_errno = errno;

2148

1645

#ifdef __linux__

2149

1646

if(restore_loglevel){

2150

1647

ret_linux = klogctl(7, NULL, 0);

2154

1651

}

2155

1652

#endif /* __linux__ */

2156

1653

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

}

1654

/* Lower privileges */

1655

lower_privileges();

2166

1656

2167

1657

/* Close the socket */

2168

ret = close(sd);

1658

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

2169

1659

if(ret == -1){

2170

1660

perror_plus("close");

2171

1661

}

2172

1662

2173

1663

if(ret_setflags == -1){

2174

errno = ioctl_errno;

1664

errno = ret_errno;

2175

1665

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2176

1666

errno = old_errno;

2177

return ioctl_errno;

1667

return ret_errno;

2178

1668

}

2179

1669

} else if(debug){

2180

1670

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

2198

1688

return 0;

2199

1689

}

2200

1690

2201

__attribute__((nonnull, warn_unused_result))

2202

int take_down_interface(const char *const interface){

2203

int old_errno = errno;

1691

error_t take_down_interface(const char *const interface){

1692

int sd = -1;

1693

error_t old_errno = errno;

1694

error_t ret_errno = 0;

1695

int ret, ret_setflags;

2204

1696

struct ifreq network;

2205

1697

unsigned int if_index = if_nametoindex(interface);

2206

1698

if(if_index == 0){

2209

1701

return ENXIO;

2210

1702

}

2211

1703

if(interface_is_up(interface)){

2212

int ret_errno = 0;

2213

int ioctl_errno = 0;

2214

1704

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

2215

1705

ret_errno = errno;

2216

1706

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

2217

1707

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

2218

errno = old_errno;

2219

1708

return ret_errno;

2220

1709

}

2221

1710

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

2222

1711

2223

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

2224

if(sd == -1){

1712

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1713

if(sd < 0){

2225

1714

ret_errno = errno;

2226

1715

perror_plus("socket");

2227

1716

errno = old_errno;

2233

1722

interface);

2234

1723

}

2235

1724

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

}

1725

/* Raise priviliges */

1726

raise_privileges();

1727

1728

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

1729

ret_errno = errno;

1730

1731

/* Lower privileges */

1732

lower_privileges();

2255

1733

2256

1734

/* Close the socket */

2257

int ret = close(sd);

1735

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

2258

1736

if(ret == -1){

2259

1737

perror_plus("close");

2260

1738

}

2261

1739

2262

1740

if(ret_setflags == -1){

2263

errno = ioctl_errno;

1741

errno = ret_errno;

2264

1742

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2265

1743

errno = old_errno;

2266

return ioctl_errno;

1744

return ret_errno;

2267

1745

}

2268

1746

} else if(debug){

2269

1747

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

2275

1753

}

2276

1754

2277

1755

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

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 };

1756

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

1757

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

1758

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

2283

1759

AvahiSServiceBrowser *sb = NULL;

2284

1760

error_t ret_errno;

2285

1761

int ret;

2286

1762

intmax_t tmpmax;

2287

1763

char *tmp;

2288

1764

int exitcode = EXIT_SUCCESS;

1765

char *interfaces = NULL;

1766

size_t interfaces_size = 0;

2289

1767

char *interfaces_to_take_down = NULL;

2290

1768

size_t interfaces_to_take_down_size = 0;

2291

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

2292

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

2293

char *tempdir = NULL;

1769

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

1770

bool tempdir_created = false;

2294

1771

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2295

1772

const char *seckey = PATHDIR "/" SECKEY;

2296

1773

const char *pubkey = PATHDIR "/" PUBKEY;

2297

const char *dh_params_file = NULL;

2298

1774

char *interfaces_hooks = NULL;

1775

size_t interfaces_hooks_size = 0;

2299

1776

2300

1777

bool gnutls_initialized = false;

2301

1778

bool gpgme_initialized = false;

2353

1830

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

2354

1831

" Diffie-Hellman key exchange",

2355

1832

.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 },

2361

1833

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

2362

1834

.arg = "STRING",

2363

1835

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

2397

1869

connect_to = arg;

2398

1870

break;

2399

1871

case 'i': /* --interface */

2400

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

2401

arg, (int)',');

1872

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1873

(int)',');

2402

1874

if(ret_errno != 0){

2403

1875

argp_error(state, "%s", strerror(ret_errno));

2404

1876

}

2418

1890

}

2419

1891

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

2420

1892

break;

2421

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

2422

dh_params_file = arg;

2423

break;

2424

1893

case 130: /* --priority */

2425

1894

mc.priority = arg;

2426

1895

break;

2466

1935

.args_doc = "",

2467

1936

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

2468

1937

" passwords from a Mandos server" };

2469

ret_errno = argp_parse(&argp, argc, argv,

2470

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2471

switch(ret_errno){

1938

ret = argp_parse(&argp, argc, argv,

1939

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1940

switch(ret){

2472

1941

case 0:

2473

1942

break;

2474

1943

case ENOMEM:

2475

1944

default:

2476

errno = ret_errno;

1945

errno = ret;

2477

1946

perror_plus("argp_parse");

2478

1947

exitcode = EX_OSERR;

2479

1948

goto end;

2482

1951

goto end;

2483

1952

}

2484

1953

}

2485

1954

2486

1955

{

2487

1956

/* Work around Debian bug #633582:

2488

1957

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

2489

1958

2490

/* Re-raise privileges */

2491

ret = raise_privileges();

2492

if(ret != 0){

2493

errno = ret;

2494

perror_plus("Failed to raise privileges");

2495

} else {

1959

/* Re-raise priviliges */

1960

if(raise_privileges() == 0){

2496

1961

struct stat st;

2497

1962

2498

1963

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

2512

1977

}

2513

1978

}

2514

1979

}

2515

close(seckey_fd);

1980

TEMP_FAILURE_RETRY(close(seckey_fd));

2516

1981

}

2517

1982

}

2518

1983

2519

1984

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

2520

1985

int pubkey_fd = open(pubkey, O_RDONLY);

2521

1986

if(pubkey_fd == -1){

2533

1998

}

2534

1999

}

2535

2000

}

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

2001

TEMP_FAILURE_RETRY(close(pubkey_fd));

2002

}

2003

}

2004

2562

2005

/* Lower privileges */

2563

ret = lower_privileges();

2564

if(ret != 0){

2565

errno = ret;

2566

perror_plus("Failed to lower privileges");

2006

errno = 0;

2007

ret = seteuid(uid);

2008

if(ret == -1){

2009

perror_plus("seteuid");

2567

2010

}

2568

2011

}

2569

2012

}

2570

2013

2571

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

2014

/* Remove empty interface names */

2572

2015

{

2573

2016

char *interface = NULL;

2574

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

2017

while((interface = argz_next(interfaces, interfaces_size,

2575

2018

interface))){

2576

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

2577

and if_nametoindex(interface) == 0){

2578

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

2019

if(if_nametoindex(interface) == 0){

2020

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

2579

2021

fprintf_plus(stderr, "Not using nonexisting interface"

2580

2022

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

2581

2023

}

2582

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2024

argz_delete(&interfaces, &interfaces_size, interface);

2583

2025

interface = NULL;

2584

2026

}

2585

2027

}

2587

2029

2588

2030

/* Run network hooks */

2589

2031

{

2590

if(mc.interfaces != NULL){

2591

interfaces_hooks = malloc(mc.interfaces_size);

2032

2033

if(interfaces != NULL){

2034

interfaces_hooks = malloc(interfaces_size);

2592

2035

if(interfaces_hooks == NULL){

2593

2036

perror_plus("malloc");

2594

2037

goto end;

2595

2038

}

2596

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

2597

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

2598

}

2599

run_network_hooks("start", interfaces_hooks != NULL ?

2600

interfaces_hooks : "", delay);

2039

memcpy(interfaces_hooks, interfaces, interfaces_size);

2040

interfaces_hooks_size = interfaces_size;

2041

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2042

(int)',');

2043

}

2044

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

2045

interfaces_hooks : "", delay)){

2046

goto end;

2047

}

2601

2048

}

2602

2049

2603

2050

if(not debug){

2680

2127

}

2681

2128

2682

2129

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

2683

if(mc.interfaces == NULL){

2684

struct dirent **direntries = NULL;

2130

if(interfaces == NULL){

2131

struct dirent **direntries;

2685

2132

/* Look for any good interfaces */

2686

2133

ret = scandir(sys_class_net, &direntries, good_interface,

2687

2134

alphasort);

2688

2135

if(ret >= 1){

2689

2136

/* Add all found interfaces to interfaces list */

2690

2137

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

2691

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

2138

ret_errno = argz_add(&interfaces, &interfaces_size,

2692

2139

direntries[i]->d_name);

2693

2140

if(ret_errno != 0){

2694

errno = ret_errno;

2695

2141

perror_plus("argz_add");

2696

free(direntries[i]);

2697

2142

continue;

2698

2143

}

2699

2144

if(debug){

2700

2145

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

2701

2146

direntries[i]->d_name);

2702

2147

}

2703

free(direntries[i]);

2704

2148

}

2705

2149

free(direntries);

2706

2150

} else {

2707

if(ret == 0){

2708

free(direntries);

2709

}

2151

free(direntries);

2710

2152

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

2711

2153

exitcode = EXIT_FAILURE;

2712

2154

goto end;

2713

2155

}

2714

2156

}

2715

2157

2716

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

2717

{

2158

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

2159

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

2160

if(debug){

2161

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2162

interfaces);

2163

}

2164

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2165

}

2166

2167

/* Bring up interfaces which are down */

2168

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

2169

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

2718

2170

char *interface = NULL;

2719

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

2171

while((interface = argz_next(interfaces, interfaces_size,

2720

2172

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

2173

bool interface_was_up = interface_is_up(interface);

2738

errno = bring_up_interface(interface, delay);

2174

ret = bring_up_interface(interface, delay);

2739

2175

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));

2176

if(ret != 0){

2177

errno = ret;

2178

perror_plus("Failed to bring up interface");

2743

2179

} 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

}

2180

ret_errno = argz_add(&interfaces_to_take_down,

2181

&interfaces_to_take_down_size,

2182

interface);

2750

2183

}

2751

2184

}

2752

2185

}

2186

free(interfaces);

2187

interfaces = NULL;

2188

interfaces_size = 0;

2753

2189

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

2754

2190

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

2755

2191

}

2756

2192

}

2757

2193

2758

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

2759

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

2760

if(debug){

2761

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2762

mc.interfaces);

2763

}

2764

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

2765

}

2766

2767

2194

if(quit_now){

2768

2195

goto end;

2769

2196

}

2770

2197

2771

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

2198

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

2772

2199

if(ret == -1){

2773

2200

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

2774

2201

exitcode = EX_UNAVAILABLE;

2781

2208

goto end;

2782

2209

}

2783

2210

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){

2211

if(mkdtemp(tempdir) == NULL){

2794

2212

perror_plus("mkdtemp");

2795

2213

goto end;

2796

2214

}

2215

tempdir_created = true;

2797

2216

2798

2217

if(quit_now){

2799

2218

goto end;

2835

2254

exitcode = EX_USAGE;

2836

2255

goto end;

2837

2256

}

2838

2257

2839

2258

if(quit_now){

2840

2259

goto end;

2841

2260

}

2871

2290

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

2872

2291

(int)retry_interval);

2873

2292

}

2874

sleep((unsigned int)retry_interval);

2293

sleep((int)retry_interval);

2875

2294

}

2876

2295

2877

if(not quit_now){

2296

if (not quit_now){

2878

2297

exitcode = EXIT_SUCCESS;

2879

2298

}

2880

2299

2896

2315

2897

2316

/* Allocate a new server */

2898

2317

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2899

&config, NULL, NULL, &ret);

2318

&config, NULL, NULL, &ret_errno);

2900

2319

2901

2320

/* Free the Avahi configuration data */

2902

2321

avahi_server_config_free(&config);

2905

2324

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

2906

2325

if(mc.server == NULL){

2907

2326

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

2908

avahi_strerror(ret));

2327

avahi_strerror(ret_errno));

2909

2328

exitcode = EX_UNAVAILABLE;

2910

2329

goto end;

2911

2330

}

2935

2354

if(debug){

2936

2355

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

2937

2356

}

2938

2357

2939

2358

ret = avahi_loop_with_timeout(simple_poll,

2940

2359

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

2941

2360

if(debug){

2950

2369

}

2951

2370

2952

2371

/* Cleanup things */

2953

free(mc.interfaces);

2954

2955

2372

if(sb != NULL)

2956

2373

avahi_s_service_browser_free(sb);

2957

2374

2963

2380

2964

2381

if(gnutls_initialized){

2965

2382

gnutls_certificate_free_credentials(mc.cred);

2383

gnutls_global_deinit();

2966

2384

gnutls_dh_params_deinit(mc.dh_params);

2967

2385

}

2968

2386

2976

2394

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

2977

2395

while(mc.current_server != NULL){

2978

2396

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

2987

2397

free(mc.current_server);

2988

2398

mc.current_server = next;

2989

2399

}

2990

2400

}

2991

2401

2992

/* Re-raise privileges */

2402

/* Re-raise priviliges */

2993

2403

{

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

}

2404

raise_privileges();

2405

2406

/* Run network hooks */

2407

run_network_hooks("stop", interfaces_hooks != NULL ?

2408

interfaces_hooks : "", delay);

2409

2410

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

2411

{

2412

char *interface = NULL;

2413

while((interface=argz_next(interfaces_to_take_down,

2414

interfaces_to_take_down_size,

2415

interface))){

2416

ret_errno = take_down_interface(interface);

2417

if(ret_errno != 0){

2418

errno = ret_errno;

2419

perror_plus("Failed to take down interface");

2420

}

2421

}

2422

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

2423

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

2424

" down\n");

2425

}

2426

}

2427

2428

lower_privileges_permanently();

3028

2429

}

3029

2430

3030

2431

free(interfaces_to_take_down);

3031

2432

free(interfaces_hooks);

3032

2433

3033

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

3034

uintmax_t level){

2434

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

2435

if(tempdir_created){

3035

2436

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){

2437

struct dirent *direntry = NULL;

2438

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

2439

alphasort);

2440

if (numentries > 0){

3048

2441

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

3089

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

3090

if(tempdir != NULL){

3091

clean_dir_at(-1, tempdir, 0);

2442

direntry = direntries[i];

2443

char *fullname = NULL;

2444

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

2445

direntry->d_name);

2446

if(ret < 0){

2447

perror_plus("asprintf");

2448

continue;

2449

}

2450

ret = remove(fullname);

2451

if(ret == -1){

2452

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

2453

strerror(errno));

2454

}

2455

free(fullname);

2456

}

2457

}

2458

2459

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

2460

free(direntries);

2461

if (numentries == -1){

2462

perror_plus("scandir");

2463

}

2464

ret = rmdir(tempdir);

2465

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

2466

perror_plus("rmdir");

2467

}

3092

2468

}

3093

2469

3094

2470

if(quit_now){