/mandos/trunk : revision 782

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(), strcpy() */

51

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

52

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

53

sockaddr_in6, PF_INET6,

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

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

61

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

62

*/

63

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

73

*/

74

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

75

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

76

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

76

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

77

unlinkat() */

77

78

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

78

79

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

79

80

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

141

142

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

142

143

char *connect_to = NULL;

143

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

144

146

uid_t uid = 65534;

145

147

gid_t gid = 65534;

146

148

232

234

.af = af };

233

235

if(new_server->ip == NULL){

234

236

perror_plus("strdup");

237

free(new_server);

235

238

return false;

236

239

}

237

240

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

238

241

if(ret == -1){

239

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

240

252

return false;

241

253

}

242

254

/* Special case of first server */

258

270

* Initialize GPGME.

259

271

*/

260

272

__attribute__((nonnull, warn_unused_result))

261

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

262

const char *tempdir, mandos_context *mc){

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

263

277

gpgme_error_t rc;

264

278

gpgme_engine_info_t engine_info;

265

279

266

280

/*

267

281

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

268

282

*/

269

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

270

284

int ret;

271

285

int fd;

272

286

gpgme_data_t pgp_data;

291

305

return false;

292

306

}

293

307

294

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

308

ret = close(fd);

295

309

if(ret == -1){

296

310

perror_plus("close");

297

311

}

479

493

return plaintext_length;

480

494

}

481

495

496

__attribute__((warn_unused_result, const))

497

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

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

482

503

__attribute__((warn_unused_result))

483

504

static const char *safer_gnutls_strerror(int value){

484

505

const char *ret = gnutls_strerror(value);

485

if(ret == NULL)

486

ret = "(unknown)";

487

return ret;

506

return safe_string(ret);

488

507

}

489

508

490

509

/* GnuTLS log function callback */

497

516

__attribute__((nonnull, warn_unused_result))

498

517

static int init_gnutls_global(const char *pubkeyfilename,

499

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

500

520

mandos_context *mc){

501

521

int ret;

522

unsigned int uret;

502

523

503

524

if(debug){

504

525

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

555

576

safer_gnutls_strerror(ret));

556

577

goto globalfail;

557

578

}

558

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

559

if(ret != GNUTLS_E_SUCCESS){

560

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

561

safer_gnutls_strerror(ret));

562

goto globalfail;

563

}

564

579

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

580

if(dhparamsfilename != NULL){

581

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

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

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

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

if(params.data == NULL){

619

dhparamsfilename = NULL;

620

}

621

if(dhparamsfilename == NULL){

622

break;

623

}

624

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

625

GNUTLS_X509_FMT_PEM);

626

if(ret != GNUTLS_E_SUCCESS){

627

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

628

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

629

safer_gnutls_strerror(ret));

630

dhparamsfilename = NULL;

631

}

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

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

637

/* Try to read the private key file */

638

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

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

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

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

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

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

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

689

if(ret != GNUTLS_E_SUCCESS){

690

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

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

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

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

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

726

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

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

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

733

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

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

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

741

mc->dh_bits);

742

}

743

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

744

if(ret != GNUTLS_E_SUCCESS){

745

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

746

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

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

565

751

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

566

752

567

753

return 0;

627

813

/* ignore client certificate if any. */

628

814

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

629

815

630

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

631

632

816

return 0;

633

817

}

634

818

636

820

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

637

821

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

638

822

823

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

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

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

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

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

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

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

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

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

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

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

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

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

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

875

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

876

__attribute__((nonnull, warn_unused_result))

877

static bool add_delete_local_route(const bool add,

878

const char *address,

879

AvahiIfIndex if_index){

880

int ret;

881

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

882

char add_arg[] = "add";

883

char delete_arg[] = "delete";

884

char debug_flag[] = "--debug";

885

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

886

if(pluginhelperdir == NULL){

887

if(debug){

888

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

889

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

890

}

891

return false;

892

}

893

894

char interface[IF_NAMESIZE];

895

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

896

perror_plus("if_indextoname");

897

return false;

898

}

899

900

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

901

if(devnull == -1){

902

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

903

return false;

904

}

905

pid_t pid = fork();

906

if(pid == 0){

907

/* Child */

908

/* Raise privileges */

909

errno = raise_privileges_permanently();

910

if(errno != 0){

911

perror_plus("Failed to raise privileges");

912

/* _exit(EX_NOPERM); */

913

} else {

914

/* Set group */

915

errno = 0;

916

ret = setgid(0);

917

if(ret == -1){

918

perror_plus("setgid");

919

_exit(EX_NOPERM);

920

}

921

/* Reset supplementary groups */

922

errno = 0;

923

ret = setgroups(0, NULL);

924

if(ret == -1){

925

perror_plus("setgroups");

926

_exit(EX_NOPERM);

927

}

928

}

929

ret = dup2(devnull, STDIN_FILENO);

930

if(ret == -1){

931

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

932

_exit(EX_OSERR);

933

}

934

ret = close(devnull);

935

if(ret == -1){

936

perror_plus("close");

937

_exit(EX_OSERR);

938

}

939

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

940

if(ret == -1){

941

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

942

_exit(EX_OSERR);

943

}

944

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

945

O_RDONLY

946

| O_DIRECTORY

947

| O_PATH

948

| O_CLOEXEC));

949

if(helperdir_fd == -1){

950

perror_plus("open");

951

_exit(EX_UNAVAILABLE);

952

}

953

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

954

helper, O_RDONLY));

955

if(helper_fd == -1){

956

perror_plus("openat");

957

close(helperdir_fd);

958

_exit(EX_UNAVAILABLE);

959

}

960

close(helperdir_fd);

961

#ifdef __GNUC__

962

#pragma GCC diagnostic push

963

#pragma GCC diagnostic ignored "-Wcast-qual"

964

#endif

965

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

966

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

967

interface, debug ? debug_flag : NULL, NULL },

968

environ) == -1){

969

#ifdef __GNUC__

970

#pragma GCC diagnostic pop

971

#endif

972

perror_plus("fexecve");

973

_exit(EXIT_FAILURE);

974

}

975

}

976

if(pid == -1){

977

perror_plus("fork");

978

return false;

979

}

980

int status;

981

pid_t pret = -1;

982

errno = 0;

983

do {

984

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

985

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

986

int errno_raising = 0;

987

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

988

errno_raising = errno;

989

perror_plus("Failed to raise privileges in order to"

990

" kill helper program");

991

}

992

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

993

perror_plus("kill");

994

}

995

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

996

perror_plus("Failed to lower privileges after killing"

997

" helper program");

998

}

999

return false;

1000

}

1001

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

1002

if(pret == -1){

1003

perror_plus("waitpid");

1004

return false;

1005

}

1006

if(WIFEXITED(status)){

1007

if(WEXITSTATUS(status) != 0){

1008

fprintf_plus(stderr, "Error: iprouteadddel exited"

1009

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

1010

return false;

1011

}

1012

return true;

1013

}

1014

if(WIFSIGNALED(status)){

1015

fprintf_plus(stderr, "Error: iprouteadddel died by"

1016

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

1017

return false;

1018

}

1019

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

1020

return false;

1021

}

1022

1023

__attribute__((nonnull, warn_unused_result))

1024

static bool add_local_route(const char *address,

1025

AvahiIfIndex if_index){

1026

if(debug){

1027

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

1028

}

1029

return add_delete_local_route(true, address, if_index);

1030

}

1031

1032

__attribute__((nonnull, warn_unused_result))

1033

static bool delete_local_route(const char *address,

1034

AvahiIfIndex if_index){

1035

if(debug){

1036

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

1037

}

1038

return add_delete_local_route(false, address, if_index);

1039

}

1040

639

1041

/* Called when a Mandos server is found */

640

1042

__attribute__((nonnull, warn_unused_result))

641

1043

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

652

1054

int retval = -1;

653

1055

gnutls_session_t session;

654

1056

int pf; /* Protocol family */

1057

bool route_added = false;

655

1058

656

1059

errno = 0;

657

1060

715

1118

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

716

1119

}

717

1120

718

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

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

719

1122

if(tcp_sd < 0){

720

1123

int e = errno;

721

1124

perror_plus("socket");

728

1131

goto mandos_end;

729

1132

}

730

1133

731

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

732

1134

if(af == AF_INET6){

733

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

734

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

1135

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

1136

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

1137

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

735

1138

} else { /* IPv4 */

736

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

737

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

1139

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

1140

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

1141

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

738

1142

}

739

1143

if(ret < 0 ){

740

1144

int e = errno;

810

1214

goto mandos_end;

811

1215

}

812

1216

813

if(af == AF_INET6){

814

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

815

sizeof(struct sockaddr_in6));

816

} else {

817

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

818

sizeof(struct sockaddr_in));

819

}

820

if(ret < 0){

821

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

822

int e = errno;

823

perror_plus("connect");

824

errno = e;

825

}

826

goto mandos_end;

827

}

828

829

if(quit_now){

830

errno = EINTR;

831

goto mandos_end;

1217

while(true){

1218

if(af == AF_INET6){

1219

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

1220

sizeof(struct sockaddr_in6));

1221

} else {

1222

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

1223

sizeof(struct sockaddr_in));

1224

}

1225

if(ret < 0){

1226

if(errno == ENETUNREACH

1227

and if_index != AVAHI_IF_UNSPEC

1228

and connect_to == NULL

1229

and not route_added and

1230

((af == AF_INET6 and not

1231

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1232

&to)->sin6_addr)))

1233

or (af == AF_INET and

1234

/* Not a a IPv4LL address */

1235

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

1236

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

1237

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

1238

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

1239

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

1240

connect to a Mandos server announced by Avahi on a server

1241

host with a global address. Work around this by retrying

1242

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

1243

1244

Avahi bug reference:

1245

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

1246

https://bugs.debian.org/587961

1247

*/

1248

if(debug){

1249

fprintf_plus(stderr, "Mandos server unreachable, trying"

1250

" direct route\n");

1251

}

1252

int e = errno;

1253

route_added = add_local_route(ip, if_index);

1254

if(route_added){

1255

continue;

1256

}

1257

errno = e;

1258

}

1259

if(errno != ECONNREFUSED or debug){

1260

int e = errno;

1261

perror_plus("connect");

1262

errno = e;

1263

}

1264

goto mandos_end;

1265

}

1266

1267

if(quit_now){

1268

errno = EINTR;

1269

goto mandos_end;

1270

}

1271

break;

832

1272

}

833

1273

834

1274

const char *out = mandos_protocol_version;

1017

1457

1018

1458

mandos_end:

1019

1459

{

1460

if(route_added){

1461

if(not delete_local_route(ip, if_index)){

1462

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

1463

" interface %d", ip, if_index);

1464

}

1465

}

1020

1466

int e = errno;

1021

1467

free(decrypted_buffer);

1022

1468

free(buffer);

1023

1469

if(tcp_sd >= 0){

1024

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

1470

ret = close(tcp_sd);

1025

1471

}

1026

1472

if(ret == -1){

1027

1473

if(e == 0){

1062

1508

timed out */

1063

1509

1064

1510

if(quit_now){

1511

avahi_s_service_resolver_free(r);

1065

1512

return;

1066

1513

}

1067

1514

1333

1780

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

1334

1781

"abcdefghijklmnopqrstuvwxyz"

1335

1782

"0123456789"

1336

"_-");

1783

"_.-");

1337

1784

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

1338

1785

/* Contains non-allowed characters */

1339

1786

if(debug){

1343

1790

return 0;

1344

1791

}

1345

1792

1346

char *fullname = NULL;

1347

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

1348

if(ret < 0){

1349

perror_plus("asprintf");

1350

return 0;

1351

}

1352

1353

ret = stat(fullname, &st);

1793

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

1354

1794

if(ret == -1){

1355

1795

if(debug){

1356

1796

perror_plus("Could not stat hook");

1454

1894

}

1455

1895

}

1456

1896

1457

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

1458

__attribute__((warn_unused_result))

1459

error_t raise_privileges(void){

1460

error_t old_errno = errno;

1461

error_t ret_errno = 0;

1462

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

1463

ret_errno = errno;

1464

perror_plus("seteuid");

1465

}

1466

errno = old_errno;

1467

return ret_errno;

1468

}

1469

1470

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

1471

__attribute__((warn_unused_result))

1472

error_t raise_privileges_permanently(void){

1473

error_t old_errno = errno;

1474

error_t ret_errno = raise_privileges();

1475

if(ret_errno != 0){

1476

errno = old_errno;

1477

return ret_errno;

1478

}

1479

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

1480

ret_errno = errno;

1481

perror_plus("seteuid");

1482

}

1483

errno = old_errno;

1484

return ret_errno;

1485

}

1486

1487

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

1488

__attribute__((warn_unused_result))

1489

error_t lower_privileges(void){

1490

error_t old_errno = errno;

1491

error_t ret_errno = 0;

1492

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

1493

ret_errno = errno;

1494

perror_plus("seteuid");

1495

}

1496

errno = old_errno;

1497

return ret_errno;

1498

}

1499

1500

/* Lower privileges permanently */

1501

__attribute__((warn_unused_result))

1502

error_t lower_privileges_permanently(void){

1503

error_t old_errno = errno;

1504

error_t ret_errno = 0;

1505

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

1506

ret_errno = errno;

1507

perror_plus("setuid");

1508

}

1509

errno = old_errno;

1510

return ret_errno;

1511

}

1512

1513

1897

__attribute__((nonnull))

1514

1898

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

1515

1899

const float delay){

1516

struct dirent **direntries;

1517

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

1518

alphasort);

1900

struct dirent **direntries = NULL;

1901

if(hookdir_fd == -1){

1902

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1903

| O_CLOEXEC);

1904

if(hookdir_fd == -1){

1905

if(errno == ENOENT){

1906

if(debug){

1907

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

1908

" found\n", hookdir);

1909

}

1910

} else {

1911

perror_plus("open");

1912

}

1913

return;

1914

}

1915

}

1916

#ifdef __GLIBC__

1917

#if __GLIBC_PREREQ(2, 15)

1918

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

1919

runnable_hook, alphasort);

1920

#else /* not __GLIBC_PREREQ(2, 15) */

1921

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

1922

alphasort);

1923

#endif /* not __GLIBC_PREREQ(2, 15) */

1924

#else /* not __GLIBC__ */

1925

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

1926

alphasort);

1927

#endif /* not __GLIBC__ */

1519

1928

if(numhooks == -1){

1520

if(errno == ENOENT){

1521

if(debug){

1522

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

1523

" found\n", hookdir);

1524

}

1525

} else {

1526

perror_plus("scandir");

1929

perror_plus("scandir");

1930

return;

1931

}

1932

struct dirent *direntry;

1933

int ret;

1934

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

1935

if(devnull == -1){

1936

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

1937

return;

1938

}

1939

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

1940

direntry = direntries[i];

1941

if(debug){

1942

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

1943

direntry->d_name);

1527

1944

}

1528

} else {

1529

struct dirent *direntry;

1530

int ret;

1531

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

1532

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

1533

direntry = direntries[i];

1534

char *fullname = NULL;

1535

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

1536

if(ret < 0){

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

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

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

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

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

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

1990

if(ret == -1){

1537

1991

perror_plus("asprintf");

1538

continue;

1539

}

1540

if(debug){

1541

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

1542

direntry->d_name);

1543

}

1544

pid_t hook_pid = fork();

1545

if(hook_pid == 0){

1546

/* Child */

1547

/* Raise privileges */

1548

if(raise_privileges_permanently() != 0){

1549

perror_plus("Failed to raise privileges");

1550

_exit(EX_NOPERM);

1551

}

1552

/* Set group */

1553

errno = 0;

1554

ret = setgid(0);

1555

if(ret == -1){

1556

perror_plus("setgid");

1557

_exit(EX_NOPERM);

1558

}

1559

/* Reset supplementary groups */

1560

errno = 0;

1561

ret = setgroups(0, NULL);

1562

if(ret == -1){

1563

perror_plus("setgroups");

1564

_exit(EX_NOPERM);

1565

}

1566

ret = dup2(devnull, STDIN_FILENO);

1567

if(ret == -1){

1568

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

1569

_exit(EX_OSERR);

1570

}

1571

ret = close(devnull);

1572

if(ret == -1){

1573

perror_plus("close");

1574

_exit(EX_OSERR);

1575

}

1576

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1577

if(ret == -1){

1578

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

1579

_exit(EX_OSERR);

1580

}

1581

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

1582

if(ret == -1){

1583

perror_plus("setenv");

1584

_exit(EX_OSERR);

1585

}

1586

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

1587

if(ret == -1){

1588

perror_plus("setenv");

1589

_exit(EX_OSERR);

1590

}

1591

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

1592

if(ret == -1){

1593

perror_plus("setenv");

1594

_exit(EX_OSERR);

1595

}

1596

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

1597

if(ret == -1){

1598

perror_plus("setenv");

1599

_exit(EX_OSERR);

1600

}

1601

char *delaystring;

1602

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

1603

if(ret == -1){

1604

perror_plus("asprintf");

1605

_exit(EX_OSERR);

1606

}

1607

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

1608

if(ret == -1){

1609

free(delaystring);

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

1613

1996

free(delaystring);

1614

if(connect_to != NULL){

1615

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

1616

if(ret == -1){

1617

perror_plus("setenv");

1618

_exit(EX_OSERR);

1619

}

1620

}

1621

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

1622

perror_plus("execl");

1623

_exit(EXIT_FAILURE);

1624

}

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

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

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

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

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

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

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

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

2032

_exit(EX_OSERR);

2033

}

2034

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

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

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

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

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

2054

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

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

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

2061

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

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

1625

2065

} else {

1626

int status;

1627

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

1628

perror_plus("waitpid");

1629

free(fullname);

1630

continue;

1631

}

1632

if(WIFEXITED(status)){

1633

if(WEXITSTATUS(status) != 0){

1634

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

1635

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

1636

WEXITSTATUS(status));

1637

free(fullname);

1638

continue;

1639

}

1640

} else if(WIFSIGNALED(status)){

1641

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

1642

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

1643

WTERMSIG(status));

1644

free(fullname);

1645

continue;

1646

} else {

1647

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

1648

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

1649

free(fullname);

1650

continue;

1651

}

1652

}

1653

free(fullname);

1654

if(debug){

1655

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

1656

direntry->d_name);

1657

}

1658

}

1659

close(devnull);

1660

}

2066

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

2067

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

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

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

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

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

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

1661

2085

}

1662

2086

1663

2087

__attribute__((nonnull, warn_unused_result))

1698

2122

}

1699

2123

1700

2124

if(quit_now){

1701

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

2125

ret = close(sd);

1702

2126

if(ret == -1){

1703

2127

perror_plus("close");

1704

2128

}

1713

2137

1714

2138

/* Raise privileges */

1715

2139

ret_errno = raise_privileges();

2140

if(ret_errno != 0){

2141

errno = ret_errno;

2142

perror_plus("Failed to raise privileges");

2143

}

2144

2145

#ifdef __linux__

2146

int ret_linux;

1716

2147

bool restore_loglevel = false;

1717

if(ret_errno != 0){

1718

perror_plus("Failed to raise privileges");

1719

}

1720

#ifdef __linux__

1721

int ret_linux;

1722

2148

if(ret_errno == 0){

1723

2149

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1724

2150

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

1752

2178

}

1753

2179

1754

2180

/* Close the socket */

1755

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

2181

ret = close(sd);

1756

2182

if(ret == -1){

1757

2183

perror_plus("close");

1758

2184

}

1822

2248

/* Raise privileges */

1823

2249

ret_errno = raise_privileges();

1824

2250

if(ret_errno != 0){

2251

errno = ret_errno;

1825

2252

perror_plus("Failed to raise privileges");

1826

2253

}

2254

1827

2255

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

1828

2256

ioctl_errno = errno;

1829

2257

1838

2266

}

1839

2267

1840

2268

/* Close the socket */

1841

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

2269

int ret = close(sd);

1842

2270

if(ret == -1){

1843

2271

perror_plus("close");

1844

2272

}

1859

2287

}

1860

2288

1861

2289

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

1862

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

1863

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

1864

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

1865

.interfaces = NULL, .interfaces_size = 0 };

2290

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

2291

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

2292

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

2293

.current_server = NULL, .interfaces = NULL,

2294

.interfaces_size = 0 };

1866

2295

AvahiSServiceBrowser *sb = NULL;

1867

2296

error_t ret_errno;

1868

2297

int ret;

1871

2300

int exitcode = EXIT_SUCCESS;

1872

2301

char *interfaces_to_take_down = NULL;

1873

2302

size_t interfaces_to_take_down_size = 0;

1874

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

1875

bool tempdir_created = false;

2303

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

2304

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

2305

char *tempdir = NULL;

1876

2306

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1877

2307

const char *seckey = PATHDIR "/" SECKEY;

1878

2308

const char *pubkey = PATHDIR "/" PUBKEY;

2309

const char *dh_params_file = NULL;

1879

2310

char *interfaces_hooks = NULL;

1880

2311

1881

2312

bool gnutls_initialized = false;

1934

2365

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

1935

2366

" Diffie-Hellman key exchange",

1936

2367

.group = 2 },

2368

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

2369

.arg = "FILE",

2370

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

2371

" for the Diffie-Hellman key exchange",

2372

.group = 2 },

1937

2373

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

1938

2374

.arg = "STRING",

1939

2375

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

1994

2430

}

1995

2431

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

1996

2432

break;

2433

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

2434

dh_params_file = arg;

2435

break;

1997

2436

case 130: /* --priority */

1998

2437

mc.priority = arg;

1999

2438

break;

2055

2494

goto end;

2056

2495

}

2057

2496

}

2058

2497

2059

2498

{

2060

2499

/* Work around Debian bug #633582:

2061

2500

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

2085

2524

}

2086

2525

}

2087

2526

}

2088

TEMP_FAILURE_RETRY(close(seckey_fd));

2527

close(seckey_fd);

2089

2528

}

2090

2529

}

2091

2530

2092

2531

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

2093

2532

int pubkey_fd = open(pubkey, O_RDONLY);

2094

2533

if(pubkey_fd == -1){

2106

2545

}

2107

2546

}

2108

2547

}

2109

TEMP_FAILURE_RETRY(close(pubkey_fd));

2110

}

2111

}

2112

2548

close(pubkey_fd);

2549

}

2550

}

2551

2552

if(dh_params_file != NULL

2553

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

2554

int dhparams_fd = open(dh_params_file, O_RDONLY);

2555

if(dhparams_fd == -1){

2556

perror_plus("open");

2557

} else {

2558

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

2559

if(ret == -1){

2560

perror_plus("fstat");

2561

} else {

2562

if(S_ISREG(st.st_mode)

2563

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

2564

ret = fchown(dhparams_fd, uid, gid);

2565

if(ret == -1){

2566

perror_plus("fchown");

2567

}

2568

}

2569

}

2570

close(dhparams_fd);

2571

}

2572

}

2573

2113

2574

/* Lower privileges */

2114

2575

ret_errno = lower_privileges();

2115

2576

if(ret_errno != 0){

2232

2693

2233

2694

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

2234

2695

if(mc.interfaces == NULL){

2235

struct dirent **direntries;

2696

struct dirent **direntries = NULL;

2236

2697

/* Look for any good interfaces */

2237

2698

ret = scandir(sys_class_net, &direntries, good_interface,

2238

2699

alphasort);

2244

2705

if(ret_errno != 0){

2245

2706

errno = ret_errno;

2246

2707

perror_plus("argz_add");

2708

free(direntries[i]);

2247

2709

continue;

2248

2710

}

2249

2711

if(debug){

2250

2712

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

2251

2713

direntries[i]->d_name);

2252

2714

}

2715

free(direntries[i]);

2253

2716

}

2254

2717

free(direntries);

2255

2718

} else {

2256

free(direntries);

2719

if(ret == 0){

2720

free(direntries);

2721

}

2257

2722

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

2258

2723

exitcode = EXIT_FAILURE;

2259

2724

goto end;

2285

2750

errno = bring_up_interface(interface, delay);

2286

2751

if(not interface_was_up){

2287

2752

if(errno != 0){

2288

perror_plus("Failed to bring up interface");

2753

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

2754

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

2289

2755

} else {

2290

2756

errno = argz_add(&interfaces_to_take_down,

2291

2757

&interfaces_to_take_down_size,

2314

2780

goto end;

2315

2781

}

2316

2782

2317

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

2783

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

2318

2784

if(ret == -1){

2319

2785

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

2320

2786

exitcode = EX_UNAVAILABLE;

2327

2793

goto end;

2328

2794

}

2329

2795

2330

if(mkdtemp(tempdir) == NULL){

2796

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

2797

tempdir = mkdtemp(run_tempdir);

2798

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

2799

if(debug){

2800

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

2801

run_tempdir, old_tempdir);

2802

}

2803

tempdir = mkdtemp(old_tempdir);

2804

}

2805

if(tempdir == NULL){

2331

2806

perror_plus("mkdtemp");

2332

2807

goto end;

2333

2808

}

2334

tempdir_created = true;

2335

2809

2336

2810

if(quit_now){

2337

2811

goto end;

2473

2947

if(debug){

2474

2948

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

2475

2949

}

2476

2950

2477

2951

ret = avahi_loop_with_timeout(simple_poll,

2478

2952

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

2479

2953

if(debug){

2515

2989

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

2516

2990

while(mc.current_server != NULL){

2517

2991

server *next = mc.current_server->next;

2992

#ifdef __GNUC__

2993

#pragma GCC diagnostic push

2994

#pragma GCC diagnostic ignored "-Wcast-qual"

2995

#endif

2996

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

2997

#ifdef __GNUC__

2998

#pragma GCC diagnostic pop

2999

#endif

2518

3000

free(mc.current_server);

2519

3001

mc.current_server = next;

2520

3002

}

2524

3006

{

2525

3007

ret_errno = raise_privileges();

2526

3008

if(ret_errno != 0){

3009

errno = ret_errno;

2527

3010

perror_plus("Failed to raise privileges");

2528

3011

} else {

2529

3012

2549

3032

}

2550

3033

}

2551

3034

}

3035

2552

3036

ret_errno = lower_privileges_permanently();

2553

3037

if(ret_errno != 0){

3038

errno = ret_errno;

2554

3039

perror_plus("Failed to lower privileges permanently");

2555

3040

}

2556

3041

}

2559

3044

free(interfaces_hooks);

2560

3045

2561

3046

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

2562

if(tempdir_created){

3047

if(tempdir != NULL){

2563

3048

struct dirent **direntries = NULL;

2564

struct dirent *direntry = NULL;

2565

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

2566

alphasort);

2567

if(numentries > 0){

2568

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

2569

direntry = direntries[i];

2570

char *fullname = NULL;

2571

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

2572

direntry->d_name);

2573

if(ret < 0){

2574

perror_plus("asprintf");

2575

continue;

2576

}

2577

ret = remove(fullname);

2578

if(ret == -1){

2579

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

2580

strerror(errno));

2581

}

2582

free(fullname);

3049

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY

3050

| O_NOFOLLOW

3051

| O_DIRECTORY

3052

| O_PATH));

3053

if(tempdir_fd == -1){

3054

perror_plus("open");

3055

} else {

3056

#ifdef __GLIBC__

3057

#if __GLIBC_PREREQ(2, 15)

3058

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

3059

notdotentries, alphasort);

3060

#else /* not __GLIBC_PREREQ(2, 15) */

3061

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

3062

alphasort);

3063

#endif /* not __GLIBC_PREREQ(2, 15) */

3064

#else /* not __GLIBC__ */

3065

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

3066

alphasort);

3067

#endif /* not __GLIBC__ */

3068

if(numentries >= 0){

3069

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

3070

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

3071

if(ret == -1){

3072

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

3073

" \"%s\", 0): %s\n", tempdir,

3074

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

3075

}

3076

free(direntries[i]);

3077

}

3078

3079

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

3080

free(direntries);

3081

if(numentries == -1){

3082

perror_plus("scandir");

3083

}

3084

ret = rmdir(tempdir);

3085

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

3086

perror_plus("rmdir");

3087

}

2583

3088

}

2584

}

2585

2586

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

2587

free(direntries);

2588

if(numentries == -1){

2589

perror_plus("scandir");

2590

}

2591

ret = rmdir(tempdir);

2592

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

2593

perror_plus("rmdir");

3089

close(tempdir_fd);

2594

3090

}

2595

3091

}

2596

3092