/mandos/release : revision 237.7.366

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

42

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

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

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

45

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

46

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

47

strtof(), abort() */

48

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

49

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

50

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

49

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

50

asprintf(), strncpy() */

51

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

52

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

53

sockaddr_in6, PF_INET6,

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect() */

59

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

61

62

*/

62

63

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

63

64

strtoimax() */

64

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

65

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

66

EAI_SYSTEM, ENETUNREACH,

67

EHOSTUNREACH, ECONNREFUSED, EPROTO,

68

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

65

70

program_invocation_short_name */

66

71

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

67

72

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

72

77

*/

73

78

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

74

79

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

75

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

76

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

80

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

81

unlinkat() */

82

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

77

83

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

78

84

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

79

85

argp_state, struct argp,

91

97

argz_delete(), argz_append(),

92

98

argz_stringify(), argz_add(),

93

99

argz_count() */

100

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

101

EAI_SYSTEM, gai_strerror() */

94

102

95

103

#ifdef __linux__

96

104

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

138

146

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

139

147

char *connect_to = NULL;

140

148

const char *hookdir = HOOKDIR;

149

int hookdir_fd = -1;

141

150

uid_t uid = 65534;

142

151

gid_t gid = 65534;

143

152

180

189

perror(print_text);

181

190

}

182

191

183

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

192

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

184

193

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

185

194

va_list ap;

186

195

va_start (ap, format);

187

196

188

197

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

189

198

program_invocation_short_name));

190

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

199

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

191

200

}

192

201

193

202

/*

195

204

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

196

205

* "buffer_length" is how much is already used.

197

206

*/

207

__attribute__((nonnull, warn_unused_result))

198

208

size_t incbuffer(char **buffer, size_t buffer_length,

199

209

size_t buffer_capacity){

200

210

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

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

202

if(buffer == NULL){

211

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

212

if(new_buf == NULL){

213

int old_errno = errno;

214

free(*buffer);

215

errno = old_errno;

216

*buffer = NULL;

203

217

return 0;

204

218

}

219

*buffer = new_buf;

205

220

buffer_capacity += BUFFER_SIZE;

206

221

}

207

222

return buffer_capacity;

208

223

}

209

224

210

225

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

226

__attribute__((nonnull, warn_unused_result))

211

227

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

212

228

int af, server **current_server){

213

229

int ret;

222

238

.af = af };

223

239

if(new_server->ip == NULL){

224

240

perror_plus("strdup");

241

free(new_server);

242

return false;

243

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

#ifdef __GNUC__

248

#pragma GCC diagnostic push

249

#pragma GCC diagnostic ignored "-Wcast-qual"

250

#endif

251

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

252

#ifdef __GNUC__

253

#pragma GCC diagnostic pop

254

#endif

255

free(new_server);

225

256

return false;

226

257

}

227

258

/* Special case of first server */

229

260

new_server->next = new_server;

230

261

new_server->prev = new_server;

231

262

*current_server = new_server;

232

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

233

263

} else {

264

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

234

265

new_server->next = *current_server;

235

266

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

236

267

new_server->prev->next = new_server;

237

268

(*current_server)->prev = new_server;

238

269

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

270

return true;

245

271

}

246

272

247

273

/*

248

274

* Initialize GPGME.

249

275

*/

250

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

251

const char *tempdir, mandos_context *mc){

276

__attribute__((nonnull, warn_unused_result))

277

static bool init_gpgme(const char * const seckey,

278

const char * const pubkey,

279

const char * const tempdir,

280

mandos_context *mc){

252

281

gpgme_error_t rc;

253

282

gpgme_engine_info_t engine_info;

254

283

255

284

/*

256

285

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

257

286

*/

258

bool import_key(const char *filename){

287

bool import_key(const char * const filename){

259

288

int ret;

260

289

int fd;

261

290

gpgme_data_t pgp_data;

280

309

return false;

281

310

}

282

311

283

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

312

ret = close(fd);

284

313

if(ret == -1){

285

314

perror_plus("close");

286

315

}

342

371

* Decrypt OpenPGP data.

343

372

* Returns -1 on error

344

373

*/

374

__attribute__((nonnull, warn_unused_result))

345

375

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

376

size_t crypto_size,

347

377

char **plaintext,

467

497

return plaintext_length;

468

498

}

469

499

470

static const char * safer_gnutls_strerror(int value){

500

__attribute__((warn_unused_result, const))

501

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

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

507

__attribute__((warn_unused_result))

508

static const char *safer_gnutls_strerror(int value){

471

509

const char *ret = gnutls_strerror(value);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

510

return safe_string(ret);

475

511

}

476

512

477

513

/* GnuTLS log function callback */

514

__attribute__((nonnull))

478

515

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

479

516

const char* string){

480

517

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

481

518

}

482

519

520

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

483

521

static int init_gnutls_global(const char *pubkeyfilename,

484

522

const char *seckeyfilename,

523

const char *dhparamsfilename,

485

524

mandos_context *mc){

486

525

int ret;

526

unsigned int uret;

487

527

488

528

if(debug){

489

529

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

490

530

}

491

531

492

ret = gnutls_global_init();

493

if(ret != GNUTLS_E_SUCCESS){

494

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

495

safer_gnutls_strerror(ret));

496

return -1;

497

}

498

499

532

if(debug){

500

533

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

501

534

* - GnuTLS manual

509

542

if(ret != GNUTLS_E_SUCCESS){

510

543

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

511

544

safer_gnutls_strerror(ret));

512

gnutls_global_deinit();

513

545

return -1;

514

546

}

515

547

540

572

safer_gnutls_strerror(ret));

541

573

goto globalfail;

542

574

}

543

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

544

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

547

goto globalfail;

548

}

549

575

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

576

if(dhparamsfilename != NULL){

577

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

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

586

while(true){

587

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

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

591

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

595

break;

596

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

599

BUFFER_SIZE);

600

/* EOF */

601

if(bytes_read == 0){

602

break;

603

}

604

/* check bytes_read for failure */

605

if(bytes_read < 0){

606

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

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

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

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

624

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

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

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

633

/* Try to read the private key file */

634

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

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

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

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

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

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

676

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

679

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

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

685

if(ret != GNUTLS_E_SUCCESS){

686

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

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

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

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

704

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

714

}

715

}

716

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

720

if(debug){

721

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

722

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

723

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

726

}

727

} else {

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

734

}

735

} else if(debug){

736

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

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

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

742

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

743

safer_gnutls_strerror(ret));

744

goto globalfail;

745

}

746

}

550

747

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

551

748

552

749

return 0;

554

751

globalfail:

555

752

556

753

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_global_deinit();

558

754

gnutls_dh_params_deinit(mc->dh_params);

559

755

return -1;

560

756

}

561

757

758

__attribute__((nonnull, warn_unused_result))

562

759

static int init_gnutls_session(gnutls_session_t *session,

563

760

mandos_context *mc){

564

761

int ret;

611

808

/* ignore client certificate if any. */

612

809

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

810

614

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

616

811

return 0;

617

812

}

618

813

620

815

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

621

816

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

622

817

818

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

819

__attribute__((warn_unused_result))

820

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

623

1036

/* Called when a Mandos server is found */

1037

__attribute__((nonnull, warn_unused_result))

624

1038

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

625

1039

AvahiIfIndex if_index,

626

1040

int af, mandos_context *mc){

627

1041

int ret, tcp_sd = -1;

628

1042

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

1043

struct sockaddr_storage to;

633

1044

char *buffer = NULL;

634

1045

char *decrypted_buffer = NULL;

635

1046

size_t buffer_length = 0;

638

1049

int retval = -1;

639

1050

gnutls_session_t session;

640

1051

int pf; /* Protocol family */

1052

bool route_added = false;

641

1053

642

1054

errno = 0;

643

1055

701

1113

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

702

1114

}

703

1115

704

tcp_sd = socket(pf, SOCK_STREAM, 0);

1116

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

705

1117

if(tcp_sd < 0){

706

1118

int e = errno;

707

1119

perror_plus("socket");

714

1126

goto mandos_end;

715

1127

}

716

1128

717

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

718

1129

if(af == AF_INET6){

719

to.in6.sin6_family = (sa_family_t)af;

720

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

1130

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

1131

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

1132

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

721

1133

} else { /* IPv4 */

722

to.in.sin_family = (sa_family_t)af;

723

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

1134

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

1135

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

1136

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

724

1137

}

725

1138

if(ret < 0 ){

726

1139

int e = errno;

735

1148

goto mandos_end;

736

1149

}

737

1150

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

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

741

-Wunreachable-code*/

1151

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

1152

if(IN6_IS_ADDR_LINKLOCAL

1153

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

742

1154

if(if_index == AVAHI_IF_UNSPEC){

743

1155

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

744

1156

" incomplete without a network interface\n");

746

1158

goto mandos_end;

747

1159

}

748

1160

/* Set the network interface number as scope */

749

to.in6.sin6_scope_id = (uint32_t)if_index;

1161

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

750

1162

}

751

1163

} else {

752

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

753

-Wconversion and

754

-Wunreachable-code */

1164

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

755

1165

}

756

1166

757

1167

if(quit_now){

774

1184

}

775

1185

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

1186

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

777

const char *pcret;

778

if(af == AF_INET6){

779

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

780

sizeof(addrstr));

781

} else {

782

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

783

sizeof(addrstr));

784

}

785

if(pcret == NULL){

786

perror_plus("inet_ntop");

787

} else {

788

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

789

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

790

}

791

}

792

}

793

794

if(quit_now){

795

errno = EINTR;

796

goto mandos_end;

797

}

798

799

if(af == AF_INET6){

800

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

801

} else {

802

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

803

}

804

if(ret < 0){

805

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

806

int e = errno;

807

perror_plus("connect");

808

errno = e;

809

}

810

goto mandos_end;

811

}

812

813

if(quit_now){

814

errno = EINTR;

815

goto mandos_end;

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;

816

1267

}

817

1268

818

1269

const char *out = mandos_protocol_version;

1001

1452

1002

1453

mandos_end:

1003

1454

{

1455

if(route_added){

1456

if(not delete_local_route(ip, if_index)){

1457

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

1458

" interface %d", ip, if_index);

1459

}

1460

}

1004

1461

int e = errno;

1005

1462

free(decrypted_buffer);

1006

1463

free(buffer);

1007

1464

if(tcp_sd >= 0){

1008

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

1465

ret = close(tcp_sd);

1009

1466

}

1010

1467

if(ret == -1){

1011

1468

if(e == 0){

1023

1480

return retval;

1024

1481

}

1025

1482

1483

__attribute__((nonnull))

1026

1484

static void resolve_callback(AvahiSServiceResolver *r,

1027

1485

AvahiIfIndex interface,

1028

1486

AvahiProtocol proto,

1036

1494

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

1495

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

1496

flags,

1039

void* mc){

1497

void *mc){

1040

1498

if(r == NULL){

1041

1499

return;

1042

1500

}

1045

1503

timed out */

1046

1504

1047

1505

if(quit_now){

1506

avahi_s_service_resolver_free(r);

1048

1507

return;

1049

1508

}

1050

1509

1095

1554

const char *domain,

1096

1555

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1556

flags,

1098

void* mc){

1557

void *mc){

1099

1558

if(b == NULL){

1100

1559

return;

1101

1560

}

1161

1620

errno = old_errno;

1162

1621

}

1163

1622

1623

__attribute__((nonnull, warn_unused_result))

1164

1624

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

1165

1625

int ret;

1166

1626

error_t ret_errno;

1172

1632

errno = ret_errno;

1173

1633

return false;

1174

1634

}

1175

strcpy(ifr->ifr_name, ifname);

1635

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

1636

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

1176

1637

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1177

1638

if(ret == -1){

1178

1639

if(debug){

1185

1646

return true;

1186

1647

}

1187

1648

1649

__attribute__((nonnull, warn_unused_result))

1188

1650

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

1189

1651

1190

1652

/* Reject the loopback device */

1232

1694

* corresponds to an acceptable network device.

1233

1695

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

1234

1696

*/

1697

__attribute__((nonnull, warn_unused_result))

1235

1698

int good_interface(const struct dirent *if_entry){

1236

1699

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

1237

1700

return 0;

1255

1718

/*

1256

1719

* This function determines if a network interface is up.

1257

1720

*/

1721

__attribute__((nonnull, warn_unused_result))

1258

1722

bool interface_is_up(const char *interface){

1259

1723

struct ifreq ifr;

1260

1724

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

1271

1735

/*

1272

1736

* This function determines if a network interface is running

1273

1737

*/

1738

__attribute__((nonnull, warn_unused_result))

1274

1739

bool interface_is_running(const char *interface){

1275

1740

struct ifreq ifr;

1276

1741

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

1284

1749

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

1285

1750

}

1286

1751

1752

__attribute__((nonnull, pure, warn_unused_result))

1287

1753

int notdotentries(const struct dirent *direntry){

1288

1754

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

1289

1755

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

1296

1762

}

1297

1763

1298

1764

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

1765

__attribute__((nonnull, warn_unused_result))

1299

1766

int runnable_hook(const struct dirent *direntry){

1300

1767

int ret;

1301

1768

size_t sret;

1309

1776

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

1310

1777

"abcdefghijklmnopqrstuvwxyz"

1311

1778

"0123456789"

1312

"_-");

1779

"_.-");

1313

1780

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

1314

1781

/* Contains non-allowed characters */

1315

1782

if(debug){

1319

1786

return 0;

1320

1787

}

1321

1788

1322

char *fullname = NULL;

1323

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

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

1789

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

1330

1790

if(ret == -1){

1331

1791

if(debug){

1332

1792

perror_plus("Could not stat hook");

1356

1816

return 1;

1357

1817

}

1358

1818

1819

__attribute__((nonnull, warn_unused_result))

1359

1820

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

1821

mandos_context *mc){

1361

1822

int ret;

1365

1826

1366

1827

while(true){

1367

1828

if(mc->current_server == NULL){

1368

if (debug){

1829

if(debug){

1369

1830

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

1370

1831

" No timeout!\n");

1371

1832

}

1372

1833

ret = avahi_simple_poll_iterate(s, -1);

1373

1834

} else {

1374

if (debug){

1835

if(debug){

1375

1836

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

1376

1837

" it, or wait\n");

1377

1838

}

1394

1855

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

1395

1856

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

1396

1857

1397

if (debug){

1858

if(debug){

1398

1859

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

1399

1860

block_time);

1400

1861

}

1422

1883

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

1423

1884

}

1424

1885

if(ret != 0){

1425

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

1886

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

1426

1887

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

1427

1888

}

1428

1889

}

1429

1890

}

1430

1891

}

1431

1892

1432

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

1433

error_t raise_privileges(void){

1434

error_t old_errno = errno;

1435

error_t ret_errno = 0;

1436

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

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1439

}

1440

errno = old_errno;

1441

return ret_errno;

1442

}

1443

1444

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

1445

error_t raise_privileges_permanently(void){

1446

error_t old_errno = errno;

1447

error_t ret_errno = raise_privileges();

1448

if(ret_errno != 0){

1449

errno = old_errno;

1450

return ret_errno;

1451

}

1452

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

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1455

}

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

1460

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

1461

error_t lower_privileges(void){

1462

error_t old_errno = errno;

1463

error_t ret_errno = 0;

1464

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

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1467

}

1468

errno = old_errno;

1469

return ret_errno;

1470

}

1471

1472

/* Lower privileges permanently */

1473

error_t lower_privileges_permanently(void){

1474

error_t old_errno = errno;

1475

error_t ret_errno = 0;

1476

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

1477

ret_errno = errno;

1478

perror_plus("setuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1893

__attribute__((nonnull))

1894

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

1485

1895

const float delay){

1486

struct dirent **direntries;

1896

struct dirent **direntries = NULL;

1897

if(hookdir_fd == -1){

1898

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1899

| O_CLOEXEC);

1900

if(hookdir_fd == -1){

1901

if(errno == ENOENT){

1902

if(debug){

1903

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

1904

" found\n", hookdir);

1905

}

1906

} else {

1907

perror_plus("open");

1908

}

1909

return;

1910

}

1911

}

1912

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

1913

runnable_hook, alphasort);

1914

if(numhooks == -1){

1915

perror_plus("scandir");

1916

return;

1917

}

1487

1918

struct dirent *direntry;

1488

1919

int ret;

1489

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

1490

alphasort);

1491

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

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);

1499

1930

}

1500

} else {

1501

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

1502

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

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

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

1506

if(ret < 0){

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){

1507

1977

perror_plus("asprintf");

1508

continue;

1509

}

1510

if(debug){

1511

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

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

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

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

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

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

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

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

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

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

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

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

1978

_exit(EX_OSERR);

1979

}

1980

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

1981

if(ret == -1){

1566

1982

free(delaystring);

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

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;

1578

2051

} else {

1579

int status;

1580

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

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

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

1588

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

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

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

1595

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

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

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

1601

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

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

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);

1615

2071

}

1616

2072

2073

__attribute__((nonnull, warn_unused_result))

1617

2074

error_t bring_up_interface(const char *const interface,

1618

2075

const float delay){

1619

int sd = -1;

1620

2076

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

2077

int ret;

1623

2078

struct ifreq network;

1624

2079

unsigned int if_index = if_nametoindex(interface);

1625

2080

if(if_index == 0){

1634

2089

}

1635

2090

1636

2091

if(not interface_is_up(interface)){

1637

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

2092

error_t ret_errno = 0, ioctl_errno = 0;

2093

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

1638

2094

ret_errno = errno;

1639

2095

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

1640

2096

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

2097

errno = old_errno;

1641

2098

return ret_errno;

1642

2099

}

1643

network.ifr_flags |= IFF_UP;

2100

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

1644

2101

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

2102

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

2103

if(sd == -1){

1647

2104

ret_errno = errno;

1648

2105

perror_plus("socket");

1649

2106

errno = old_errno;

1650

2107

return ret_errno;

1651

2108

}

1652

2109

1653

2110

if(quit_now){

1654

close(sd);

2111

ret = close(sd);

2112

if(ret == -1){

2113

perror_plus("close");

2114

}

1655

2115

errno = old_errno;

1656

2116

return EINTR;

1657

2117

}

1661

2121

interface);

1662

2122

}

1663

2123

1664

/* Raise priviliges */

1665

raise_privileges();

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

}

1666

2130

1667

2131

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

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

}

1675

2143

}

1676

2144

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

2145

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

2146

ioctl_errno = errno;

1679

2147

#ifdef __linux__

1680

2148

if(restore_loglevel){

1681

2149

ret_linux = klogctl(7, NULL, 0);

1685

2153

}

1686

2154

#endif /* __linux__ */

1687

2155

1688

/* Lower privileges */

1689

lower_privileges();

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

}

1690

2165

1691

2166

/* Close the socket */

1692

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

2167

ret = close(sd);

1693

2168

if(ret == -1){

1694

2169

perror_plus("close");

1695

2170

}

1696

2171

1697

2172

if(ret_setflags == -1){

1698

errno = ret_errno;

2173

errno = ioctl_errno;

1699

2174

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

2175

errno = old_errno;

1701

return ret_errno;

2176

return ioctl_errno;

1702

2177

}

1703

2178

} else if(debug){

1704

2179

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

1722

2197

return 0;

1723

2198

}

1724

2199

2200

__attribute__((nonnull, warn_unused_result))

1725

2201

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

2202

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

2203

struct ifreq network;

1731

2204

unsigned int if_index = if_nametoindex(interface);

1732

2205

if(if_index == 0){

1735

2208

return ENXIO;

1736

2209

}

1737

2210

if(interface_is_up(interface)){

2211

error_t ret_errno = 0, ioctl_errno = 0;

1738

2212

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

1739

2213

ret_errno = errno;

1740

2214

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

1741

2215

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

2216

errno = old_errno;

1742

2217

return ret_errno;

1743

2218

}

1744

2219

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

1745

2220

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

2221

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

2222

if(sd == -1){

1748

2223

ret_errno = errno;

1749

2224

perror_plus("socket");

1750

2225

errno = old_errno;

1756

2231

interface);

1757

2232

}

1758

2233

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

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

}

1767

2253

1768

2254

/* Close the socket */

1769

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

2255

int ret = close(sd);

1770

2256

if(ret == -1){

1771

2257

perror_plus("close");

1772

2258

}

1773

2259

1774

2260

if(ret_setflags == -1){

1775

errno = ret_errno;

2261

errno = ioctl_errno;

1776

2262

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

2263

errno = old_errno;

1778

return ret_errno;

2264

return ioctl_errno;

1779

2265

}

1780

2266

} else if(debug){

1781

2267

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

1787

2273

}

1788

2274

1789

2275

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

1790

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

1791

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

1792

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

1793

.interfaces = NULL, .interfaces_size = 0 };

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

2281

AvahiSServiceBrowser *sb = NULL;

1795

2282

error_t ret_errno;

1796

2283

int ret;

1799

2286

int exitcode = EXIT_SUCCESS;

1800

2287

char *interfaces_to_take_down = NULL;

1801

2288

size_t interfaces_to_take_down_size = 0;

1802

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

1803

bool tempdir_created = false;

2289

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

2290

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

2291

char *tempdir = NULL;

1804

2292

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

2293

const char *seckey = PATHDIR "/" SECKEY;

1806

2294

const char *pubkey = PATHDIR "/" PUBKEY;

2295

const char *dh_params_file = NULL;

1807

2296

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

2297

1810

2298

bool gnutls_initialized = false;

1811

2299

bool gpgme_initialized = false;

1863

2351

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

1864

2352

" Diffie-Hellman key exchange",

1865

2353

.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 },

1866

2359

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

1867

2360

.arg = "STRING",

1868

2361

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

1923

2416

}

1924

2417

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

1925

2418

break;

2419

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

2420

dh_params_file = arg;

2421

break;

1926

2422

case 130: /* --priority */

1927

2423

mc.priority = arg;

1928

2424

break;

1984

2480

goto end;

1985

2481

}

1986

2482

}

1987

2483

1988

2484

{

1989

2485

/* Work around Debian bug #633582:

1990

2486

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

1991

2487

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

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 {

1994

2494

struct stat st;

1995

2495

1996

2496

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

2010

2510

}

2011

2511

}

2012

2512

}

2013

TEMP_FAILURE_RETRY(close(seckey_fd));

2513

close(seckey_fd);

2014

2514

}

2015

2515

}

2016

2516

2017

2517

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

2018

2518

int pubkey_fd = open(pubkey, O_RDONLY);

2019

2519

if(pubkey_fd == -1){

2031

2531

}

2032

2532

}

2033

2533

}

2034

TEMP_FAILURE_RETRY(close(pubkey_fd));

2035

}

2036

}

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

2560

/* Lower privileges */

2039

lower_privileges();

2561

ret_errno = lower_privileges();

2562

if(ret_errno != 0){

2563

errno = ret_errno;

2564

perror_plus("Failed to lower privileges");

2565

}

2040

2566

}

2041

2567

}

2042

2568

2066

2592

goto end;

2067

2593

}

2068

2594

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

2595

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

2596

}

2597

run_network_hooks("start", interfaces_hooks != NULL ?

2598

interfaces_hooks : "", delay);

2077

2599

}

2078

2600

2079

2601

if(not debug){

2157

2679

2158

2680

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

2159

2681

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2682

struct dirent **direntries = NULL;

2161

2683

/* Look for any good interfaces */

2162

2684

ret = scandir(sys_class_net, &direntries, good_interface,

2163

2685

alphasort);

2167

2689

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

2168

2690

direntries[i]->d_name);

2169

2691

if(ret_errno != 0){

2692

errno = ret_errno;

2170

2693

perror_plus("argz_add");

2694

free(direntries[i]);

2171

2695

continue;

2172

2696

}

2173

2697

if(debug){

2174

2698

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

2175

2699

direntries[i]->d_name);

2176

2700

}

2701

free(direntries[i]);

2177

2702

}

2178

2703

free(direntries);

2179

2704

} else {

2180

free(direntries);

2705

if(ret == 0){

2706

free(direntries);

2707

}

2181

2708

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

2182

2709

exitcode = EXIT_FAILURE;

2183

2710

goto end;

2206

2733

break;

2207

2734

}

2208

2735

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2736

errno = bring_up_interface(interface, delay);

2210

2737

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2213

perror_plus("Failed to bring up interface");

2738

if(errno != 0){

2739

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

2740

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

2214

2741

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

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

}

2218

2748

}

2219

2749

}

2220

2750

}

2236

2766

goto end;

2237

2767

}

2238

2768

2239

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

2769

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

2240

2770

if(ret == -1){

2241

2771

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

2242

2772

exitcode = EX_UNAVAILABLE;

2249

2779

goto end;

2250

2780

}

2251

2781

2252

if(mkdtemp(tempdir) == NULL){

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){

2253

2792

perror_plus("mkdtemp");

2254

2793

goto end;

2255

2794

}

2256

tempdir_created = true;

2257

2795

2258

2796

if(quit_now){

2259

2797

goto end;

2334

2872

sleep((unsigned int)retry_interval);

2335

2873

}

2336

2874

2337

if (not quit_now){

2875

if(not quit_now){

2338

2876

exitcode = EXIT_SUCCESS;

2339

2877

}

2340

2878

2395

2933

if(debug){

2396

2934

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

2397

2935

}

2398

2936

2399

2937

ret = avahi_loop_with_timeout(simple_poll,

2400

2938

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

2401

2939

if(debug){

2423

2961

2424

2962

if(gnutls_initialized){

2425

2963

gnutls_certificate_free_credentials(mc.cred);

2426

gnutls_global_deinit();

2427

2964

gnutls_dh_params_deinit(mc.dh_params);

2428

2965

}

2429

2966

2437

2974

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

2438

2975

while(mc.current_server != NULL){

2439

2976

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

2440

2985

free(mc.current_server);

2441

2986

mc.current_server = next;

2442

2987

}

2443

2988

}

2444

2989

2445

/* Re-raise priviliges */

2990

/* Re-raise privileges */

2446

2991

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2463

}

2464

}

2465

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

2466

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

2467

" down\n");

2468

}

2469

}

2470

2471

lower_privileges_permanently();

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

}

2472

3026

}

2473

3027

2474

3028

free(interfaces_to_take_down);

2475

3029

free(interfaces_hooks);

2476

3030

3031

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

3032

uintmax_t level){

3033

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){

3046

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

2477

3087

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

2478

if(tempdir_created){

2479

struct dirent **direntries = NULL;

2480

struct dirent *direntry = NULL;

2481

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

2482

alphasort);

2483

if (numentries > 0){

2484

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

2485

direntry = direntries[i];

2486

char *fullname = NULL;

2487

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

2488

direntry->d_name);

2489

if(ret < 0){

2490

perror_plus("asprintf");

2491

continue;

2492

}

2493

ret = remove(fullname);

2494

if(ret == -1){

2495

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

2496

strerror(errno));

2497

}

2498

free(fullname);

2499

}

2500

}

2501

2502

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

2503

free(direntries);

2504

if (numentries == -1){

2505

perror_plus("scandir");

2506

}

2507

ret = rmdir(tempdir);

2508

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

2509

perror_plus("rmdir");

2510

}

3088

if(tempdir != NULL){

3089

clean_dir_at(-1, tempdir, 0);

2511

3090

}

2512

3091

2513

3092

if(quit_now){