/mandos/release : revision 237.7.201

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

strtof(), abort() */

48

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

49

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

50

asprintf(), strncpy() */

49

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

50

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

51

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

52

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

53

sockaddr_in6, PF_INET6,

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

58

inet_pton(), connect() */

59

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

61

60

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

62

61

*/

63

62

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

64

63

strtoimax() */

65

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

66

EAI_SYSTEM, ENETUNREACH,

67

EHOSTUNREACH, ECONNREFUSED, EPROTO,

68

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

64

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

70

65

program_invocation_short_name */

71

66

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

72

67

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

77

72

*/

78

73

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

79

74

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

80

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

81

unlinkat() */

82

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

75

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

76

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

83

77

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

84

78

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

85

79

argp_state, struct argp,

97

91

argz_delete(), argz_append(),

98

92

argz_stringify(), argz_add(),

99

93

argz_count() */

100

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

101

EAI_SYSTEM, gai_strerror() */

102

94

103

95

#ifdef __linux__

104

96

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

146

138

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

147

139

char *connect_to = NULL;

148

140

const char *hookdir = HOOKDIR;

149

int hookdir_fd = -1;

150

141

uid_t uid = 65534;

151

142

gid_t gid = 65534;

152

143

189

180

perror(print_text);

190

181

}

191

182

192

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

183

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

193

184

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

194

185

va_list ap;

195

186

va_start (ap, format);

204

195

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

205

196

* "buffer_length" is how much is already used.

206

197

*/

207

__attribute__((nonnull, warn_unused_result))

208

198

size_t incbuffer(char **buffer, size_t buffer_length,

209

199

size_t buffer_capacity){

210

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

211

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

212

if(new_buf == NULL){

213

int old_errno = errno;

214

free(*buffer);

215

errno = old_errno;

216

*buffer = NULL;

201

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

202

if(buffer == NULL){

217

203

return 0;

218

204

}

219

*buffer = new_buf;

220

205

buffer_capacity += BUFFER_SIZE;

221

206

}

222

207

return buffer_capacity;

223

208

}

224

209

225

210

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

226

__attribute__((nonnull, warn_unused_result))

227

211

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

228

212

int af, server **current_server){

229

213

int ret;

238

222

.af = af };

239

223

if(new_server->ip == NULL){

240

224

perror_plus("strdup");

241

free(new_server);

242

return false;

243

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

#ifdef __GNUC__

248

#pragma GCC diagnostic push

249

#pragma GCC diagnostic ignored "-Wcast-qual"

250

#endif

251

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

252

#ifdef __GNUC__

253

#pragma GCC diagnostic pop

254

#endif

255

free(new_server);

256

225

return false;

257

226

}

258

227

/* Special case of first server */

260

229

new_server->next = new_server;

261

230

new_server->prev = new_server;

262

231

*current_server = new_server;

232

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

263

233

} else {

264

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

265

234

new_server->next = *current_server;

266

235

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

267

236

new_server->prev->next = new_server;

268

237

(*current_server)->prev = new_server;

269

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

270

244

return true;

271

245

}

272

246

273

247

/*

274

248

* Initialize GPGME.

275

249

*/

276

__attribute__((nonnull, warn_unused_result))

277

static bool init_gpgme(const char * const seckey,

278

const char * const pubkey,

279

const char * const tempdir,

280

mandos_context *mc){

250

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

251

const char *tempdir, mandos_context *mc){

281

252

gpgme_error_t rc;

282

253

gpgme_engine_info_t engine_info;

283

254

284

255

/*

285

256

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

286

257

*/

287

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

288

259

int ret;

289

260

int fd;

290

261

gpgme_data_t pgp_data;

309

280

return false;

310

281

}

311

282

312

ret = close(fd);

283

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

313

284

if(ret == -1){

314

285

perror_plus("close");

315

286

}

371

342

* Decrypt OpenPGP data.

372

343

* Returns -1 on error

373

344

*/

374

__attribute__((nonnull, warn_unused_result))

375

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

376

346

size_t crypto_size,

377

347

char **plaintext,

497

467

return plaintext_length;

498

468

}

499

469

500

__attribute__((warn_unused_result, const))

501

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

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

507

__attribute__((warn_unused_result))

508

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

509

471

const char *ret = gnutls_strerror(value);

510

return safe_string(ret);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

511

475

}

512

476

513

477

/* GnuTLS log function callback */

514

__attribute__((nonnull))

515

478

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

516

479

const char* string){

517

480

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

518

481

}

519

482

520

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

521

483

static int init_gnutls_global(const char *pubkeyfilename,

522

484

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

485

mandos_context *mc){

525

486

int ret;

526

unsigned int uret;

527

487

528

488

if(debug){

529

489

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

530

490

}

531

491

492

ret = gnutls_global_init();

493

if(ret != GNUTLS_E_SUCCESS){

494

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

495

safer_gnutls_strerror(ret));

496

return -1;

497

}

498

532

499

if(debug){

533

500

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

534

501

* - GnuTLS manual

542

509

if(ret != GNUTLS_E_SUCCESS){

543

510

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

544

511

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

545

513

return -1;

546

514

}

547

515

572

540

safer_gnutls_strerror(ret));

573

541

goto globalfail;

574

542

}

575

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

576

if(dhparamsfilename != NULL){

577

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

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

586

while(true){

587

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

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

591

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

595

break;

596

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

599

BUFFER_SIZE);

600

/* EOF */

601

if(bytes_read == 0){

602

break;

603

}

604

/* check bytes_read for failure */

605

if(bytes_read < 0){

606

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

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

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

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

624

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

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

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

633

/* Try to read the private key file */

634

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

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

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

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

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

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

676

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

679

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

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

685

if(ret != GNUTLS_E_SUCCESS){

686

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

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

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

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

704

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

714

}

715

}

716

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

720

if(debug){

721

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

722

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

723

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

726

}

727

} else {

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

734

}

735

} else if(debug){

736

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

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

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

742

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

743

safer_gnutls_strerror(ret));

744

goto globalfail;

745

}

746

}

543

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

544

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

547

goto globalfail;

548

}

549

747

550

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

748

551

749

552

return 0;

751

554

globalfail:

752

555

753

556

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

754

558

gnutls_dh_params_deinit(mc->dh_params);

755

559

return -1;

756

560

}

757

561

758

__attribute__((nonnull, warn_unused_result))

759

562

static int init_gnutls_session(gnutls_session_t *session,

760

563

mandos_context *mc){

761

564

int ret;

808

611

/* ignore client certificate if any. */

809

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

613

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

811

616

return 0;

812

617

}

813

618

815

620

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

816

621

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

817

622

818

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

819

__attribute__((warn_unused_result))

820

error_t raise_privileges(void){

821

error_t old_errno = errno;

822

error_t ret_errno = 0;

823

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

824

ret_errno = errno;

825

}

826

errno = old_errno;

827

return ret_errno;

828

}

829

830

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

831

__attribute__((warn_unused_result))

832

error_t raise_privileges_permanently(void){

833

error_t old_errno = errno;

834

error_t ret_errno = raise_privileges();

835

if(ret_errno != 0){

836

errno = old_errno;

837

return ret_errno;

838

}

839

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

840

ret_errno = errno;

841

}

842

errno = old_errno;

843

return ret_errno;

844

}

845

846

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

847

__attribute__((warn_unused_result))

848

error_t lower_privileges(void){

849

error_t old_errno = errno;

850

error_t ret_errno = 0;

851

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

852

ret_errno = errno;

853

}

854

errno = old_errno;

855

return ret_errno;

856

}

857

858

/* Lower privileges permanently */

859

__attribute__((warn_unused_result))

860

error_t lower_privileges_permanently(void){

861

error_t old_errno = errno;

862

error_t ret_errno = 0;

863

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

864

ret_errno = errno;

865

}

866

errno = old_errno;

867

return ret_errno;

868

}

869

870

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

871

__attribute__((nonnull, warn_unused_result))

872

static bool add_delete_local_route(const bool add,

873

const char *address,

874

AvahiIfIndex if_index){

875

int ret;

876

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

877

char add_arg[] = "add";

878

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

880

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

881

if(pluginhelperdir == NULL){

882

if(debug){

883

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

884

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

885

}

886

return false;

887

}

888

889

char interface[IF_NAMESIZE];

890

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

891

perror_plus("if_indextoname");

892

return false;

893

}

894

895

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

896

if(devnull == -1){

897

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

898

return false;

899

}

900

pid_t pid = fork();

901

if(pid == 0){

902

/* Child */

903

/* Raise privileges */

904

errno = raise_privileges_permanently();

905

if(errno != 0){

906

perror_plus("Failed to raise privileges");

907

/* _exit(EX_NOPERM); */

908

} else {

909

/* Set group */

910

errno = 0;

911

ret = setgid(0);

912

if(ret == -1){

913

perror_plus("setgid");

914

_exit(EX_NOPERM);

915

}

916

/* Reset supplementary groups */

917

errno = 0;

918

ret = setgroups(0, NULL);

919

if(ret == -1){

920

perror_plus("setgroups");

921

_exit(EX_NOPERM);

922

}

923

}

924

ret = dup2(devnull, STDIN_FILENO);

925

if(ret == -1){

926

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

927

_exit(EX_OSERR);

928

}

929

ret = close(devnull);

930

if(ret == -1){

931

perror_plus("close");

932

_exit(EX_OSERR);

933

}

934

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

935

if(ret == -1){

936

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

937

_exit(EX_OSERR);

938

}

939

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

940

O_RDONLY

941

| O_DIRECTORY

942

| O_PATH

943

| O_CLOEXEC));

944

if(helperdir_fd == -1){

945

perror_plus("open");

946

_exit(EX_UNAVAILABLE);

947

}

948

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

949

helper, O_RDONLY));

950

if(helper_fd == -1){

951

perror_plus("openat");

952

close(helperdir_fd);

953

_exit(EX_UNAVAILABLE);

954

}

955

close(helperdir_fd);

956

#ifdef __GNUC__

957

#pragma GCC diagnostic push

958

#pragma GCC diagnostic ignored "-Wcast-qual"

959

#endif

960

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

961

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

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

964

#ifdef __GNUC__

965

#pragma GCC diagnostic pop

966

#endif

967

perror_plus("fexecve");

968

_exit(EXIT_FAILURE);

969

}

970

}

971

if(pid == -1){

972

perror_plus("fork");

973

return false;

974

}

975

int status;

976

pid_t pret = -1;

977

errno = 0;

978

do {

979

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

980

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

981

int errno_raising = 0;

982

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

983

errno_raising = errno;

984

perror_plus("Failed to raise privileges in order to"

985

" kill helper program");

986

}

987

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

988

perror_plus("kill");

989

}

990

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

991

perror_plus("Failed to lower privileges after killing"

992

" helper program");

993

}

994

return false;

995

}

996

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

997

if(pret == -1){

998

perror_plus("waitpid");

999

return false;

1000

}

1001

if(WIFEXITED(status)){

1002

if(WEXITSTATUS(status) != 0){

1003

fprintf_plus(stderr, "Error: iprouteadddel exited"

1004

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

1005

return false;

1006

}

1007

return true;

1008

}

1009

if(WIFSIGNALED(status)){

1010

fprintf_plus(stderr, "Error: iprouteadddel died by"

1011

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

1012

return false;

1013

}

1014

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

1015

return false;

1016

}

1017

1018

__attribute__((nonnull, warn_unused_result))

1019

static bool add_local_route(const char *address,

1020

AvahiIfIndex if_index){

1021

if(debug){

1022

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

1023

}

1024

return add_delete_local_route(true, address, if_index);

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool delete_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(false, address, if_index);

1034

}

1035

1036

623

/* Called when a Mandos server is found */

1037

__attribute__((nonnull, warn_unused_result))

1038

624

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

1039

625

AvahiIfIndex if_index,

1040

626

int af, mandos_context *mc){

1041

627

int ret, tcp_sd = -1;

1042

628

ssize_t sret;

1043

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1044

633

char *buffer = NULL;

1045

634

char *decrypted_buffer = NULL;

1046

635

size_t buffer_length = 0;

1049

638

int retval = -1;

1050

639

gnutls_session_t session;

1051

640

int pf; /* Protocol family */

1052

bool route_added = false;

1053

641

1054

642

errno = 0;

1055

643

1113

701

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

1114

702

}

1115

703

1116

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

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

705

if(tcp_sd < 0){

1118

706

int e = errno;

1119

707

perror_plus("socket");

1126

714

goto mandos_end;

1127

715

}

1128

716

717

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

1129

718

if(af == AF_INET6){

1130

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

1131

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

1132

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

719

to.in6.sin6_family = (sa_family_t)af;

720

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

1133

721

} else { /* IPv4 */

1134

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

1135

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

1136

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

722

to.in.sin_family = (sa_family_t)af;

723

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

1137

724

}

1138

725

if(ret < 0 ){

1139

726

int e = errno;

1148

735

goto mandos_end;

1149

736

}

1150

737

if(af == AF_INET6){

1151

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

1152

if(IN6_IS_ADDR_LINKLOCAL

1153

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

738

to.in6.sin6_port = htons(port);

739

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

1154

748

if(if_index == AVAHI_IF_UNSPEC){

1155

749

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

1156

750

" incomplete without a network interface\n");

1158

752

goto mandos_end;

1159

753

}

1160

754

/* Set the network interface number as scope */

1161

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

755

to.in6.sin6_scope_id = (uint32_t)if_index;

1162

756

}

1163

757

} else {

1164

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

758

to.in.sin_port = htons(port);

1165

759

}

1166

760

1167

761

if(quit_now){

1184

778

}

1185

779

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1186

780

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;

781

const char *pcret;

782

if(af == AF_INET6){

783

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

784

sizeof(addrstr));

785

} else {

786

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

787

sizeof(addrstr));

788

}

789

if(pcret == NULL){

790

perror_plus("inet_ntop");

791

} else {

792

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

793

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

794

}

795

}

796

}

797

798

if(quit_now){

799

errno = EINTR;

800

goto mandos_end;

801

}

802

803

if(af == AF_INET6){

804

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

805

} else {

806

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

807

}

808

if(ret < 0){

809

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

810

int e = errno;

811

perror_plus("connect");

812

errno = e;

813

}

814

goto mandos_end;

815

}

816

817

if(quit_now){

818

errno = EINTR;

819

goto mandos_end;

1267

820

}

1268

821

1269

822

const char *out = mandos_protocol_version;

1452

1005

1453

1006

mandos_end:

1454

1007

{

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

1008

int e = errno;

1462

1009

free(decrypted_buffer);

1463

1010

free(buffer);

1464

1011

if(tcp_sd >= 0){

1465

ret = close(tcp_sd);

1012

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

1466

1013

}

1467

1014

if(ret == -1){

1468

1015

if(e == 0){

1480

1027

return retval;

1481

1028

}

1482

1029

1483

__attribute__((nonnull))

1484

1030

static void resolve_callback(AvahiSServiceResolver *r,

1485

1031

AvahiIfIndex interface,

1486

1032

AvahiProtocol proto,

1494

1040

AVAHI_GCC_UNUSED AvahiStringList *txt,

1495

1041

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1496

1042

flags,

1497

void *mc){

1043

void* mc){

1498

1044

if(r == NULL){

1499

1045

return;

1500

1046

}

1503

1049

timed out */

1504

1050

1505

1051

if(quit_now){

1506

avahi_s_service_resolver_free(r);

1507

1052

return;

1508

1053

}

1509

1054

1554

1099

const char *domain,

1555

1100

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1556

1101

flags,

1557

void *mc){

1102

void* mc){

1558

1103

if(b == NULL){

1559

1104

return;

1560

1105

}

1620

1165

errno = old_errno;

1621

1166

}

1622

1167

1623

__attribute__((nonnull, warn_unused_result))

1624

1168

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

1625

1169

int ret;

1626

1170

error_t ret_errno;

1632

1176

errno = ret_errno;

1633

1177

return false;

1634

1178

}

1635

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

1636

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

1179

strcpy(ifr->ifr_name, ifname);

1637

1180

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1638

1181

if(ret == -1){

1639

1182

if(debug){

1646

1189

return true;

1647

1190

}

1648

1191

1649

__attribute__((nonnull, warn_unused_result))

1650

1192

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

1651

1193

1652

1194

/* Reject the loopback device */

1694

1236

* corresponds to an acceptable network device.

1695

1237

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

1696

1238

*/

1697

__attribute__((nonnull, warn_unused_result))

1698

1239

int good_interface(const struct dirent *if_entry){

1699

1240

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

1700

1241

return 0;

1718

1259

/*

1719

1260

* This function determines if a network interface is up.

1720

1261

*/

1721

__attribute__((nonnull, warn_unused_result))

1722

1262

bool interface_is_up(const char *interface){

1723

1263

struct ifreq ifr;

1724

1264

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

1735

1275

/*

1736

1276

* This function determines if a network interface is running

1737

1277

*/

1738

__attribute__((nonnull, warn_unused_result))

1739

1278

bool interface_is_running(const char *interface){

1740

1279

struct ifreq ifr;

1741

1280

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

1749

1288

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

1750

1289

}

1751

1290

1752

__attribute__((nonnull, pure, warn_unused_result))

1753

1291

int notdotentries(const struct dirent *direntry){

1754

1292

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

1755

1293

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

1762

1300

}

1763

1301

1764

1302

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

1765

__attribute__((nonnull, warn_unused_result))

1766

1303

int runnable_hook(const struct dirent *direntry){

1767

1304

int ret;

1768

1305

size_t sret;

1776

1313

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

1777

1314

"abcdefghijklmnopqrstuvwxyz"

1778

1315

"0123456789"

1779

"_.-");

1316

"_-");

1780

1317

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

1781

1318

/* Contains non-allowed characters */

1782

1319

if(debug){

1786

1323

return 0;

1787

1324

}

1788

1325

1789

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

1326

char *fullname = NULL;

1327

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

1328

if(ret < 0){

1329

perror_plus("asprintf");

1330

return 0;

1331

}

1332

1333

ret = stat(fullname, &st);

1790

1334

if(ret == -1){

1791

1335

if(debug){

1792

1336

perror_plus("Could not stat hook");

1816

1360

return 1;

1817

1361

}

1818

1362

1819

__attribute__((nonnull, warn_unused_result))

1820

1363

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1821

1364

mandos_context *mc){

1822

1365

int ret;

1826

1369

1827

1370

while(true){

1828

1371

if(mc->current_server == NULL){

1829

if(debug){

1372

if (debug){

1830

1373

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

1831

1374

" No timeout!\n");

1832

1375

}

1833

1376

ret = avahi_simple_poll_iterate(s, -1);

1834

1377

} else {

1835

if(debug){

1378

if (debug){

1836

1379

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

1837

1380

" it, or wait\n");

1838

1381

}

1855

1398

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

1856

1399

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

1857

1400

1858

if(debug){

1401

if (debug){

1859

1402

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

1860

1403

block_time);

1861

1404

}

1883

1426

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

1884

1427

}

1885

1428

if(ret != 0){

1886

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

1429

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

1887

1430

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

1888

1431

}

1889

1432

}

1890

1433

}

1891

1434

}

1892

1435

1893

__attribute__((nonnull))

1894

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

1436

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

1437

error_t raise_privileges(void){

1438

error_t old_errno = errno;

1439

error_t ret_errno = 0;

1440

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

1441

ret_errno = errno;

1442

perror_plus("seteuid");

1443

}

1444

errno = old_errno;

1445

return ret_errno;

1446

}

1447

1448

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

1449

error_t raise_privileges_permanently(void){

1450

error_t old_errno = errno;

1451

error_t ret_errno = raise_privileges();

1452

if(ret_errno != 0){

1453

errno = old_errno;

1454

return ret_errno;

1455

}

1456

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

1457

ret_errno = errno;

1458

perror_plus("seteuid");

1459

}

1460

errno = old_errno;

1461

return ret_errno;

1462

}

1463

1464

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

1465

error_t lower_privileges(void){

1466

error_t old_errno = errno;

1467

error_t ret_errno = 0;

1468

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

1469

ret_errno = errno;

1470

perror_plus("seteuid");

1471

}

1472

errno = old_errno;

1473

return ret_errno;

1474

}

1475

1476

/* Lower privileges permanently */

1477

error_t lower_privileges_permanently(void){

1478

error_t old_errno = errno;

1479

error_t ret_errno = 0;

1480

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

1481

ret_errno = errno;

1482

perror_plus("setuid");

1483

}

1484

errno = old_errno;

1485

return ret_errno;

1486

}

1487

1488

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

1895

1489

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);

1490

struct dirent **direntries;

1491

struct dirent *direntry;

1492

int ret;

1493

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

1494

alphasort);

1914

1495

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);

1496

if(errno == ENOENT){

1497

if(debug){

1498

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

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

perror_plus("scandir");

1930

1503

}

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){

1504

} else {

1505

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

1506

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

1507

direntry = direntries[i];

1508

char *fullname = NULL;

1509

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

1510

if(ret < 0){

1977

1511

perror_plus("asprintf");

1978

_exit(EX_OSERR);

1979

}

1980

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

1981

if(ret == -1){

1512

continue;

1513

}

1514

if(debug){

1515

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

1516

direntry->d_name);

1517

}

1518

pid_t hook_pid = fork();

1519

if(hook_pid == 0){

1520

/* Child */

1521

/* Raise privileges */

1522

raise_privileges_permanently();

1523

/* Set group */

1524

errno = 0;

1525

ret = setgid(0);

1526

if(ret == -1){

1527

perror_plus("setgid");

1528

}

1529

/* Reset supplementary groups */

1530

errno = 0;

1531

ret = setgroups(0, NULL);

1532

if(ret == -1){

1533

perror_plus("setgroups");

1534

}

1535

dup2(devnull, STDIN_FILENO);

1536

close(devnull);

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1538

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

1539

if(ret == -1){

1540

perror_plus("setenv");

1541

_exit(EX_OSERR);

1542

}

1543

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

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

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

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

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

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

char *delaystring;

1559

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

1560

if(ret == -1){

1561

perror_plus("asprintf");

1562

_exit(EX_OSERR);

1563

}

1564

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

1565

if(ret == -1){

1566

free(delaystring);

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

1982

1570

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;

1571

if(connect_to != NULL){

1572

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

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

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

1579

perror_plus("execl");

1580

_exit(EXIT_FAILURE);

1581

}

2051

1582

} 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);

1583

int status;

1584

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

1585

perror_plus("waitpid");

1586

free(fullname);

1587

continue;

1588

}

1589

if(WIFEXITED(status)){

1590

if(WEXITSTATUS(status) != 0){

1591

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

1592

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

1593

WEXITSTATUS(status));

1594

free(fullname);

1595

continue;

1596

}

1597

} else if(WIFSIGNALED(status)){

1598

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

1599

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

1600

WTERMSIG(status));

1601

free(fullname);

1602

continue;

1603

} else {

1604

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

1605

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

1606

free(fullname);

1607

continue;

1608

}

1609

}

1610

free(fullname);

1611

if(debug){

1612

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

1613

direntry->d_name);

1614

}

1615

}

1616

close(devnull);

1617

}

1618

return true;

2071

1619

}

2072

1620

2073

__attribute__((nonnull, warn_unused_result))

2074

1621

error_t bring_up_interface(const char *const interface,

2075

1622

const float delay){

1623

int sd = -1;

2076

1624

error_t old_errno = errno;

2077

int ret;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

2078

1627

struct ifreq network;

2079

1628

unsigned int if_index = if_nametoindex(interface);

2080

1629

if(if_index == 0){

2089

1638

}

2090

1639

2091

1640

if(not interface_is_up(interface)){

2092

error_t ret_errno = 0, ioctl_errno = 0;

2093

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

1641

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

2094

1642

ret_errno = errno;

2095

1643

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

2096

1644

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

2097

errno = old_errno;

2098

1645

return ret_errno;

2099

1646

}

2100

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

1647

network.ifr_flags |= IFF_UP;

2101

1648

2102

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

2103

if(sd == -1){

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

2104

1651

ret_errno = errno;

2105

1652

perror_plus("socket");

2106

1653

errno = old_errno;

2107

1654

return ret_errno;

2108

1655

}

2109

1656

2110

1657

if(quit_now){

2111

ret = close(sd);

2112

if(ret == -1){

2113

perror_plus("close");

2114

}

1658

close(sd);

2115

1659

errno = old_errno;

2116

1660

return EINTR;

2117

1661

}

2121

1665

interface);

2122

1666

}

2123

1667

2124

/* Raise privileges */

2125

ret_errno = raise_privileges();

2126

if(ret_errno != 0){

2127

errno = ret_errno;

2128

perror_plus("Failed to raise privileges");

2129

}

1668

/* Raise priviliges */

1669

raise_privileges();

2130

1670

2131

1671

#ifdef __linux__

2132

int ret_linux;

2133

bool restore_loglevel = false;

2134

if(ret_errno == 0){

2135

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2136

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

2137

ret_linux = klogctl(8, NULL, 5);

2138

if(ret_linux == -1){

2139

perror_plus("klogctl");

2140

} else {

2141

restore_loglevel = true;

2142

}

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

perror_plus("klogctl");

2143

1679

}

2144

1680

#endif /* __linux__ */

2145

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

2146

ioctl_errno = errno;

1681

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

1682

ret_errno = errno;

2147

1683

#ifdef __linux__

2148

1684

if(restore_loglevel){

2149

1685

ret_linux = klogctl(7, NULL, 0);

2153

1689

}

2154

1690

#endif /* __linux__ */

2155

1691

2156

/* If raise_privileges() succeeded above */

2157

if(ret_errno == 0){

2158

/* Lower privileges */

2159

ret_errno = lower_privileges();

2160

if(ret_errno != 0){

2161

errno = ret_errno;

2162

perror_plus("Failed to lower privileges");

2163

}

2164

}

1692

/* Lower privileges */

1693

lower_privileges();

2165

1694

2166

1695

/* Close the socket */

2167

ret = close(sd);

1696

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

2168

1697

if(ret == -1){

2169

1698

perror_plus("close");

2170

1699

}

2171

1700

2172

1701

if(ret_setflags == -1){

2173

errno = ioctl_errno;

1702

errno = ret_errno;

2174

1703

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2175

1704

errno = old_errno;

2176

return ioctl_errno;

1705

return ret_errno;

2177

1706

}

2178

1707

} else if(debug){

2179

1708

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

2197

1726

return 0;

2198

1727

}

2199

1728

2200

__attribute__((nonnull, warn_unused_result))

2201

1729

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

2202

1731

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

2203

1734

struct ifreq network;

2204

1735

unsigned int if_index = if_nametoindex(interface);

2205

1736

if(if_index == 0){

2208

1739

return ENXIO;

2209

1740

}

2210

1741

if(interface_is_up(interface)){

2211

error_t ret_errno = 0, ioctl_errno = 0;

2212

1742

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

2213

1743

ret_errno = errno;

2214

1744

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

2215

1745

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

2216

errno = old_errno;

2217

1746

return ret_errno;

2218

1747

}

2219

1748

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

2220

1749

2221

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

2222

if(sd == -1){

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

2223

1752

ret_errno = errno;

2224

1753

perror_plus("socket");

2225

1754

errno = old_errno;

2231

1760

interface);

2232

1761

}

2233

1762

2234

/* Raise privileges */

2235

ret_errno = raise_privileges();

2236

if(ret_errno != 0){

2237

errno = ret_errno;

2238

perror_plus("Failed to raise privileges");

2239

}

2240

2241

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

2242

ioctl_errno = errno;

2243

2244

/* If raise_privileges() succeeded above */

2245

if(ret_errno == 0){

2246

/* Lower privileges */

2247

ret_errno = lower_privileges();

2248

if(ret_errno != 0){

2249

errno = ret_errno;

2250

perror_plus("Failed to lower privileges");

2251

}

2252

}

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

lower_privileges();

2253

1771

2254

1772

/* Close the socket */

2255

int ret = close(sd);

1773

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

2256

1774

if(ret == -1){

2257

1775

perror_plus("close");

2258

1776

}

2259

1777

2260

1778

if(ret_setflags == -1){

2261

errno = ioctl_errno;

1779

errno = ret_errno;

2262

1780

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2263

1781

errno = old_errno;

2264

return ioctl_errno;

1782

return ret_errno;

2265

1783

}

2266

1784

} else if(debug){

2267

1785

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

2273

1791

}

2274

1792

2275

1793

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

2276

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

2277

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

2278

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

2279

.current_server = NULL, .interfaces = NULL,

2280

.interfaces_size = 0 };

1794

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

1795

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

1796

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

1797

.interfaces = NULL, .interfaces_size = 0 };

2281

1798

AvahiSServiceBrowser *sb = NULL;

2282

1799

error_t ret_errno;

2283

1800

int ret;

2286

1803

int exitcode = EXIT_SUCCESS;

2287

1804

char *interfaces_to_take_down = NULL;

2288

1805

size_t interfaces_to_take_down_size = 0;

2289

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

2290

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

2291

char *tempdir = NULL;

1806

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

1807

bool tempdir_created = false;

2292

1808

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2293

1809

const char *seckey = PATHDIR "/" SECKEY;

2294

1810

const char *pubkey = PATHDIR "/" PUBKEY;

2295

const char *dh_params_file = NULL;

2296

1811

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

2297

1813

2298

1814

bool gnutls_initialized = false;

2299

1815

bool gpgme_initialized = false;

2351

1867

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

2352

1868

" Diffie-Hellman key exchange",

2353

1869

.group = 2 },

2354

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

2355

.arg = "FILE",

2356

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

2357

" for the Diffie-Hellman key exchange",

2358

.group = 2 },

2359

1870

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

2360

1871

.arg = "STRING",

2361

1872

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

2416

1927

}

2417

1928

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

2418

1929

break;

2419

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

2420

dh_params_file = arg;

2421

break;

2422

1930

case 130: /* --priority */

2423

1931

mc.priority = arg;

2424

1932

break;

2480

1988

goto end;

2481

1989

}

2482

1990

}

2483

1991

2484

1992

{

2485

1993

/* Work around Debian bug #633582:

2486

1994

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

2487

1995

2488

/* Re-raise privileges */

2489

ret_errno = raise_privileges();

2490

if(ret_errno != 0){

2491

errno = ret_errno;

2492

perror_plus("Failed to raise privileges");

2493

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2494

1998

struct stat st;

2495

1999

2496

2000

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

2510

2014

}

2511

2015

}

2512

2016

}

2513

close(seckey_fd);

2017

TEMP_FAILURE_RETRY(close(seckey_fd));

2514

2018

}

2515

2019

}

2516

2020

2517

2021

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

2518

2022

int pubkey_fd = open(pubkey, O_RDONLY);

2519

2023

if(pubkey_fd == -1){

2531

2035

}

2532

2036

}

2533

2037

}

2534

close(pubkey_fd);

2535

}

2536

}

2537

2538

if(dh_params_file != NULL

2539

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

2540

int dhparams_fd = open(dh_params_file, O_RDONLY);

2541

if(dhparams_fd == -1){

2542

perror_plus("open");

2543

} else {

2544

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

2545

if(ret == -1){

2546

perror_plus("fstat");

2547

} else {

2548

if(S_ISREG(st.st_mode)

2549

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

2550

ret = fchown(dhparams_fd, uid, gid);

2551

if(ret == -1){

2552

perror_plus("fchown");

2553

}

2554

}

2555

}

2556

close(dhparams_fd);

2557

}

2558

}

2559

2038

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

}

2040

}

2041

2560

2042

/* Lower privileges */

2561

ret_errno = lower_privileges();

2562

if(ret_errno != 0){

2563

errno = ret_errno;

2564

perror_plus("Failed to lower privileges");

2565

}

2043

lower_privileges();

2566

2044

}

2567

2045

}

2568

2046

2592

2070

goto end;

2593

2071

}

2594

2072

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

2595

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

2596

}

2597

run_network_hooks("start", interfaces_hooks != NULL ?

2598

interfaces_hooks : "", delay);

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2599

2081

}

2600

2082

2601

2083

if(not debug){

2679

2161

2680

2162

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

2681

2163

if(mc.interfaces == NULL){

2682

struct dirent **direntries = NULL;

2164

struct dirent **direntries;

2683

2165

/* Look for any good interfaces */

2684

2166

ret = scandir(sys_class_net, &direntries, good_interface,

2685

2167

alphasort);

2689

2171

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

2690

2172

direntries[i]->d_name);

2691

2173

if(ret_errno != 0){

2692

errno = ret_errno;

2693

2174

perror_plus("argz_add");

2694

free(direntries[i]);

2695

2175

continue;

2696

2176

}

2697

2177

if(debug){

2698

2178

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

2699

2179

direntries[i]->d_name);

2700

2180

}

2701

free(direntries[i]);

2702

2181

}

2703

2182

free(direntries);

2704

2183

} else {

2705

if(ret == 0){

2706

free(direntries);

2707

}

2184

free(direntries);

2708

2185

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

2709

2186

exitcode = EXIT_FAILURE;

2710

2187

goto end;

2733

2210

break;

2734

2211

}

2735

2212

bool interface_was_up = interface_is_up(interface);

2736

errno = bring_up_interface(interface, delay);

2213

ret = bring_up_interface(interface, delay);

2737

2214

if(not interface_was_up){

2738

if(errno != 0){

2739

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

2740

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

2215

if(ret != 0){

2216

errno = ret;

2217

perror_plus("Failed to bring up interface");

2741

2218

} else {

2742

errno = argz_add(&interfaces_to_take_down,

2743

&interfaces_to_take_down_size,

2744

interface);

2745

if(errno != 0){

2746

perror_plus("argz_add");

2747

}

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

interface);

2748

2222

}

2749

2223

}

2750

2224

}

2766

2240

goto end;

2767

2241

}

2768

2242

2769

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

2243

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

2770

2244

if(ret == -1){

2771

2245

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

2772

2246

exitcode = EX_UNAVAILABLE;

2779

2253

goto end;

2780

2254

}

2781

2255

2782

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

2783

tempdir = mkdtemp(run_tempdir);

2784

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

2785

if(debug){

2786

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

2787

run_tempdir, old_tempdir);

2788

}

2789

tempdir = mkdtemp(old_tempdir);

2790

}

2791

if(tempdir == NULL){

2256

if(mkdtemp(tempdir) == NULL){

2792

2257

perror_plus("mkdtemp");

2793

2258

goto end;

2794

2259

}

2260

tempdir_created = true;

2795

2261

2796

2262

if(quit_now){

2797

2263

goto end;

2872

2338

sleep((unsigned int)retry_interval);

2873

2339

}

2874

2340

2875

if(not quit_now){

2341

if (not quit_now){

2876

2342

exitcode = EXIT_SUCCESS;

2877

2343

}

2878

2344

2933

2399

if(debug){

2934

2400

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

2935

2401

}

2936

2402

2937

2403

ret = avahi_loop_with_timeout(simple_poll,

2938

2404

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

2939

2405

if(debug){

2961

2427

2962

2428

if(gnutls_initialized){

2963

2429

gnutls_certificate_free_credentials(mc.cred);

2430

gnutls_global_deinit();

2964

2431

gnutls_dh_params_deinit(mc.dh_params);

2965

2432

}

2966

2433

2974

2441

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

2975

2442

while(mc.current_server != NULL){

2976

2443

server *next = mc.current_server->next;

2977

#ifdef __GNUC__

2978

#pragma GCC diagnostic push

2979

#pragma GCC diagnostic ignored "-Wcast-qual"

2980

#endif

2981

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

2982

#ifdef __GNUC__

2983

#pragma GCC diagnostic pop

2984

#endif

2985

2444

free(mc.current_server);

2986

2445

mc.current_server = next;

2987

2446

}

2988

2447

}

2989

2448

2990

/* Re-raise privileges */

2449

/* Re-raise priviliges */

2991

2450

{

2992

ret_errno = raise_privileges();

2993

if(ret_errno != 0){

2994

errno = ret_errno;

2995

perror_plus("Failed to raise privileges");

2996

} else {

2997

2998

/* Run network hooks */

2999

run_network_hooks("stop", interfaces_hooks != NULL ?

3000

interfaces_hooks : "", delay);

3001

3002

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

3003

{

3004

char *interface = NULL;

3005

while((interface=argz_next(interfaces_to_take_down,

3006

interfaces_to_take_down_size,

3007

interface))){

3008

ret_errno = take_down_interface(interface);

3009

if(ret_errno != 0){

3010

errno = ret_errno;

3011

perror_plus("Failed to take down interface");

3012

}

3013

}

3014

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

3015

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

3016

" down\n");

3017

}

3018

}

3019

}

3020

3021

ret_errno = lower_privileges_permanently();

3022

if(ret_errno != 0){

3023

errno = ret_errno;

3024

perror_plus("Failed to lower privileges permanently");

3025

}

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2467

}

2468

}

2469

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

2470

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

2471

" down\n");

2472

}

2473

}

2474

2475

lower_privileges_permanently();

3026

2476

}

3027

2477

3028

2478

free(interfaces_to_take_down);

3029

2479

free(interfaces_hooks);

3030

2480

3031

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

3032

uintmax_t level){

2481

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

2482

if(tempdir_created){

3033

2483

struct dirent **direntries = NULL;

3034

int dret;

3035

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

3036

O_RDONLY

3037

| O_NOFOLLOW

3038

| O_DIRECTORY

3039

| O_PATH));

3040

if(dir_fd == -1){

3041

perror_plus("open");

3042

}

3043

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

3044

notdotentries, alphasort);

3045

if(numentries >= 0){

2484

struct dirent *direntry = NULL;

2485

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

2486

alphasort);

2487

if (numentries > 0){

3046

2488

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

3047

if(debug){

3048

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

3049

dirname, direntries[i]->d_name);

3050

}

3051

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

3052

if(dret == -1){

3053

if(errno == EISDIR){

3054

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

3055

AT_REMOVEDIR);

3056

}

3057

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

3058

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

3059

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

3060

/* Recurse only in this special case */

3061

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

3062

dret = 0;

3063

}

3064

if(dret == -1){

3065

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

3066

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

3067

}

3068

}

3069

free(direntries[i]);

3070

}

3071

3072

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

3073

free(direntries);

3074

if(numentries == -1){

3075

perror_plus("scandirat");

3076

}

3077

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3078

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

3079

perror_plus("rmdir");

3080

}

3081

} else {

3082

perror_plus("scandirat");

3083

}

3084

close(dir_fd);

3085

}

3086

3087

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

3088

if(tempdir != NULL){

3089

clean_dir_at(-1, tempdir, 0);

2489

direntry = direntries[i];

2490

char *fullname = NULL;

2491

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

2492

direntry->d_name);

2493

if(ret < 0){

2494

perror_plus("asprintf");

2495

continue;

2496

}

2497

ret = remove(fullname);

2498

if(ret == -1){

2499

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

2500

strerror(errno));

2501

}

2502

free(fullname);

2503

}

2504

}

2505

2506

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

2507

free(direntries);

2508

if (numentries == -1){

2509

perror_plus("scandir");

2510

}

2511

ret = rmdir(tempdir);

2512

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

2513

perror_plus("rmdir");

2514

}

3090

2515

}

3091

2516

3092

2517

if(quit_now){