/mandos/release : revision 237.7.238

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

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

45

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

46

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

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

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(),

77

unlinkat() */

76

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

78

77

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

79

78

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

80

79

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

142

141

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

143

142

char *connect_to = NULL;

144

143

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

144

uid_t uid = 65534;

147

145

gid_t gid = 65534;

148

146

234

232

.af = af };

235

233

if(new_server->ip == NULL){

236

234

perror_plus("strdup");

237

free(new_server);

238

235

return false;

239

236

}

240

237

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

241

238

if(ret == -1){

242

239

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);

252

240

return false;

253

241

}

254

242

/* Special case of first server */

493

481

return plaintext_length;

494

482

}

495

483

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

503

484

__attribute__((warn_unused_result))

504

485

static const char *safer_gnutls_strerror(int value){

505

486

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

487

if(ret == NULL)

488

ret = "(unknown)";

489

return ret;

507

490

}

508

491

509

492

/* GnuTLS log function callback */

516

499

__attribute__((nonnull, warn_unused_result))

517

500

static int init_gnutls_global(const char *pubkeyfilename,

518

501

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

502

mandos_context *mc){

521

503

int ret;

522

unsigned int uret;

523

504

524

505

if(debug){

525

506

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

576

557

safer_gnutls_strerror(ret));

577

558

goto globalfail;

578

559

}

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

}

560

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

561

if(ret != GNUTLS_E_SUCCESS){

562

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

563

safer_gnutls_strerror(ret));

564

goto globalfail;

565

}

566

751

567

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

752

568

753

569

return 0;

813

629

/* ignore client certificate if any. */

814

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

815

631

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

633

816

634

return 0;

817

635

}

818

636

820

638

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

821

639

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

822

640

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 = (int)TEMP_FAILURE_RETRY(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

_exit(EX_UNAVAILABLE);

958

}

959

TEMP_FAILURE_RETRY(close(helperdir_fd));

960

#ifdef __GNUC__

961

#pragma GCC diagnostic push

962

#pragma GCC diagnostic ignored "-Wcast-qual"

963

#endif

964

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

965

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

966

interface, debug ? debug_flag : NULL, NULL },

967

environ) == -1){

968

#ifdef __GNUC__

969

#pragma GCC diagnostic pop

970

#endif

971

perror_plus("fexecve");

972

_exit(EXIT_FAILURE);

973

}

974

}

975

if(pid == -1){

976

perror_plus("fork");

977

return false;

978

}

979

int status;

980

pid_t pret = -1;

981

errno = 0;

982

do {

983

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

984

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

985

int errno_raising = 0;

986

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

987

errno_raising = errno;

988

perror_plus("Failed to raise privileges in order to"

989

" kill helper program");

990

}

991

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

992

perror_plus("kill");

993

}

994

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

995

perror_plus("Failed to lower privileges after killing"

996

" helper program");

997

}

998

return false;

999

}

1000

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

1001

if(pret == -1){

1002

perror_plus("waitpid");

1003

return false;

1004

}

1005

if(WIFEXITED(status)){

1006

if(WEXITSTATUS(status) != 0){

1007

fprintf_plus(stderr, "Error: iprouteadddel exited"

1008

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

1009

return false;

1010

}

1011

return true;

1012

}

1013

if(WIFSIGNALED(status)){

1014

fprintf_plus(stderr, "Error: iprouteadddel died by"

1015

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

1016

return false;

1017

}

1018

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

1019

return false;

1020

}

1021

1022

__attribute__((nonnull, warn_unused_result))

1023

static bool add_local_route(const char *address,

1024

AvahiIfIndex if_index){

1025

if(debug){

1026

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

1027

}

1028

return add_delete_local_route(true, address, if_index);

1029

}

1030

1031

__attribute__((nonnull, warn_unused_result))

1032

static bool delete_local_route(const char *address,

1033

AvahiIfIndex if_index){

1034

if(debug){

1035

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

1036

}

1037

return add_delete_local_route(false, address, if_index);

1038

}

1039

1040

641

/* Called when a Mandos server is found */

1041

642

__attribute__((nonnull, warn_unused_result))

1042

643

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

1053

654

int retval = -1;

1054

655

gnutls_session_t session;

1055

656

int pf; /* Protocol family */

1056

bool route_added = false;

1057

657

1058

658

errno = 0;

1059

659

1117

717

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

1118

718

}

1119

719

1120

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

720

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

721

if(tcp_sd < 0){

1122

722

int e = errno;

1123

723

perror_plus("socket");

1212

812

goto mandos_end;

1213

813

}

1214

814

1215

while(true){

1216

if(af == AF_INET6){

1217

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

1218

sizeof(struct sockaddr_in6));

1219

} else {

1220

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

1221

sizeof(struct sockaddr_in));

1222

}

1223

if(ret < 0){

1224

if(errno == ENETUNREACH

1225

and if_index != AVAHI_IF_UNSPEC

1226

and connect_to == NULL

1227

and not route_added and

1228

((af == AF_INET6 and not

1229

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1230

&to)->sin6_addr)))

1231

or (af == AF_INET and

1232

/* Not a a IPv4LL address */

1233

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

1234

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

1235

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

1236

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

1237

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

1238

connect to a Mandos server announced by Avahi on a server

1239

host with a global address. Work around this by retrying

1240

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

1241

1242

Avahi bug reference:

1243

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

1244

https://bugs.debian.org/587961

1245

*/

1246

if(debug){

1247

fprintf_plus(stderr, "Mandos server unreachable, trying"

1248

" direct route\n");

1249

}

1250

int e = errno;

1251

route_added = add_local_route(ip, if_index);

1252

if(route_added){

1253

continue;

1254

}

1255

errno = e;

1256

}

1257

if(errno != ECONNREFUSED or debug){

1258

int e = errno;

1259

perror_plus("connect");

1260

errno = e;

1261

}

1262

goto mandos_end;

1263

}

1264

1265

if(quit_now){

1266

errno = EINTR;

1267

goto mandos_end;

1268

}

1269

break;

815

if(af == AF_INET6){

816

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

817

sizeof(struct sockaddr_in6));

818

} else {

819

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

820

sizeof(struct sockaddr_in));

821

}

822

if(ret < 0){

823

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

824

int e = errno;

825

perror_plus("connect");

826

errno = e;

827

}

828

goto mandos_end;

829

}

830

831

if(quit_now){

832

errno = EINTR;

833

goto mandos_end;

1270

834

}

1271

835

1272

836

const char *out = mandos_protocol_version;

1455

1019

1456

1020

mandos_end:

1457

1021

{

1458

if(route_added){

1459

if(not delete_local_route(ip, if_index)){

1460

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

1461

" interface %d", ip, if_index);

1462

}

1463

}

1464

1022

int e = errno;

1465

1023

free(decrypted_buffer);

1466

1024

free(buffer);

1506

1064

timed out */

1507

1065

1508

1066

if(quit_now){

1509

avahi_s_service_resolver_free(r);

1510

1067

return;

1511

1068

}

1512

1069

1788

1345

return 0;

1789

1346

}

1790

1347

1791

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

1348

char *fullname = NULL;

1349

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

1350

if(ret < 0){

1351

perror_plus("asprintf");

1352

return 0;

1353

}

1354

1355

ret = stat(fullname, &st);

1792

1356

if(ret == -1){

1793

1357

if(debug){

1794

1358

perror_plus("Could not stat hook");

1795

1359

}

1796

1360

return 0;

1797

1361

}

1362

free(fullname);

1798

1363

if(not (S_ISREG(st.st_mode))){

1799

1364

/* Not a regular file */

1800

1365

if(debug){

1892

1457

}

1893

1458

}

1894

1459

1460

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

1461

__attribute__((warn_unused_result))

1462

error_t raise_privileges(void){

1463

error_t old_errno = errno;

1464

error_t ret_errno = 0;

1465

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

1466

ret_errno = errno;

1467

perror_plus("seteuid");

1468

}

1469

errno = old_errno;

1470

return ret_errno;

1471

}

1472

1473

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

1474

__attribute__((warn_unused_result))

1475

error_t raise_privileges_permanently(void){

1476

error_t old_errno = errno;

1477

error_t ret_errno = raise_privileges();

1478

if(ret_errno != 0){

1479

errno = old_errno;

1480

return ret_errno;

1481

}

1482

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

1483

ret_errno = errno;

1484

perror_plus("seteuid");

1485

}

1486

errno = old_errno;

1487

return ret_errno;

1488

}

1489

1490

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

1491

__attribute__((warn_unused_result))

1492

error_t lower_privileges(void){

1493

error_t old_errno = errno;

1494

error_t ret_errno = 0;

1495

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

1496

ret_errno = errno;

1497

perror_plus("seteuid");

1498

}

1499

errno = old_errno;

1500

return ret_errno;

1501

}

1502

1503

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1505

error_t lower_privileges_permanently(void){

1506

error_t old_errno = errno;

1507

error_t ret_errno = 0;

1508

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

1509

ret_errno = errno;

1510

perror_plus("setuid");

1511

}

1512

errno = old_errno;

1513

return ret_errno;

1514

}

1515

1895

1516

__attribute__((nonnull))

1896

1517

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

1897

1518

const float delay){

1898

struct dirent **direntries = NULL;

1899

if(hookdir_fd == -1){

1900

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1901

| O_CLOEXEC);

1902

if(hookdir_fd == -1){

1903

if(errno == ENOENT){

1904

if(debug){

1905

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

1906

" found\n", hookdir);

1907

}

1908

} else {

1909

perror_plus("open");

1910

}

1911

return;

1912

}

1913

}

1914

#ifdef __GLIBC__

1915

#if __GLIBC_PREREQ(2, 15)

1916

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

1917

runnable_hook, alphasort);

1918

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

1919

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

1920

alphasort);

1921

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

1922

#else /* not __GLIBC__ */

1923

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

1924

alphasort);

1925

#endif /* not __GLIBC__ */

1519

struct dirent **direntries;

1520

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

1521

alphasort);

1926

1522

if(numhooks == -1){

1927

perror_plus("scandir");

1928

return;

1929

}

1930

struct dirent *direntry;

1931

int ret;

1932

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

1933

if(devnull == -1){

1934

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

1935

return;

1936

}

1937

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

1938

direntry = direntries[i];

1939

if(debug){

1940

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

1941

direntry->d_name);

1523

if(errno == ENOENT){

1524

if(debug){

1525

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

1526

" found\n", hookdir);

1527

}

1528

} else {

1529

perror_plus("scandir");

1942

1530

}

1943

pid_t hook_pid = fork();

1944

if(hook_pid == 0){

1945

/* Child */

1946

/* Raise privileges */

1947

errno = raise_privileges_permanently();

1948

if(errno != 0){

1949

perror_plus("Failed to raise privileges");

1950

_exit(EX_NOPERM);

1951

}

1952

/* Set group */

1953

errno = 0;

1954

ret = setgid(0);

1955

if(ret == -1){

1956

perror_plus("setgid");

1957

_exit(EX_NOPERM);

1958

}

1959

/* Reset supplementary groups */

1960

errno = 0;

1961

ret = setgroups(0, NULL);

1962

if(ret == -1){

1963

perror_plus("setgroups");

1964

_exit(EX_NOPERM);

1965

}

1966

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

1967

if(ret == -1){

1968

perror_plus("setenv");

1969

_exit(EX_OSERR);

1970

}

1971

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

1972

if(ret == -1){

1973

perror_plus("setenv");

1974

_exit(EX_OSERR);

1975

}

1976

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

1977

if(ret == -1){

1978

perror_plus("setenv");

1979

_exit(EX_OSERR);

1980

}

1981

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

1982

if(ret == -1){

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

char *delaystring;

1987

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

1988

if(ret == -1){

1531

} else {

1532

struct dirent *direntry;

1533

int ret;

1534

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

1535

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

1536

direntry = direntries[i];

1537

char *fullname = NULL;

1538

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

1539

if(ret < 0){

1989

1540

perror_plus("asprintf");

1990

_exit(EX_OSERR);

1991

}

1992

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

1993

if(ret == -1){

1541

continue;

1542

}

1543

if(debug){

1544

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

1545

direntry->d_name);

1546

}

1547

pid_t hook_pid = fork();

1548

if(hook_pid == 0){

1549

/* Child */

1550

/* Raise privileges */

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1555

/* Set group */

1556

errno = 0;

1557

ret = setgid(0);

1558

if(ret == -1){

1559

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1561

}

1562

/* Reset supplementary groups */

1563

errno = 0;

1564

ret = setgroups(0, NULL);

1565

if(ret == -1){

1566

perror_plus("setgroups");

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

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

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

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

1582

_exit(EX_OSERR);

1583

}

1584

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

1585

if(ret == -1){

1586

perror_plus("setenv");

1587

_exit(EX_OSERR);

1588

}

1589

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

1590

if(ret == -1){

1591

perror_plus("setenv");

1592

_exit(EX_OSERR);

1593

}

1594

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

1595

if(ret == -1){

1596

perror_plus("setenv");

1597

_exit(EX_OSERR);

1598

}

1599

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

1600

if(ret == -1){

1601

perror_plus("setenv");

1602

_exit(EX_OSERR);

1603

}

1604

char *delaystring;

1605

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

1606

if(ret == -1){

1607

perror_plus("asprintf");

1608

_exit(EX_OSERR);

1609

}

1610

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

1611

if(ret == -1){

1612

free(delaystring);

1613

perror_plus("setenv");

1614

_exit(EX_OSERR);

1615

}

1994

1616

free(delaystring);

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

free(delaystring);

1999

if(connect_to != NULL){

2000

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

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

}

2006

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

2007

direntry->d_name,

2008

O_RDONLY));

2009

if(hook_fd == -1){

2010

perror_plus("openat");

2011

_exit(EXIT_FAILURE);

2012

}

2013

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

2014

perror_plus("close");

2015

_exit(EXIT_FAILURE);

2016

}

2017

ret = dup2(devnull, STDIN_FILENO);

2018

if(ret == -1){

2019

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

2020

_exit(EX_OSERR);

2021

}

2022

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

2023

if(ret == -1){

2024

perror_plus("close");

2025

_exit(EX_OSERR);

2026

}

2027

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2028

if(ret == -1){

2029

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

2030

_exit(EX_OSERR);

2031

}

2032

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

2033

environ) == -1){

2034

perror_plus("fexecve");

2035

_exit(EXIT_FAILURE);

2036

}

2037

} else {

2038

if(hook_pid == -1){

2039

perror_plus("fork");

2040

free(direntry);

2041

continue;

2042

}

2043

int status;

2044

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

2045

perror_plus("waitpid");

2046

free(direntry);

2047

continue;

2048

}

2049

if(WIFEXITED(status)){

2050

if(WEXITSTATUS(status) != 0){

2051

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

2052

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

2053

WEXITSTATUS(status));

2054

free(direntry);

2055

continue;

2056

}

2057

} else if(WIFSIGNALED(status)){

2058

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

2059

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

2060

WTERMSIG(status));

2061

free(direntry);

2062

continue;

1617

if(connect_to != NULL){

1618

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

1619

if(ret == -1){

1620

perror_plus("setenv");

1621

_exit(EX_OSERR);

1622

}

1623

}

1624

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

1625

perror_plus("execl");

1626

_exit(EXIT_FAILURE);

1627

}

2063

1628

} else {

2064

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

2065

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

2066

free(direntry);

2067

continue;

2068

}

2069

}

2070

if(debug){

2071

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

2072

direntry->d_name);

2073

}

2074

free(direntry);

2075

}

2076

free(direntries);

2077

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

2078

perror_plus("close");

2079

} else {

2080

hookdir_fd = -1;

2081

}

2082

close(devnull);

1629

int status;

1630

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

1631

perror_plus("waitpid");

1632

free(fullname);

1633

continue;

1634

}

1635

if(WIFEXITED(status)){

1636

if(WEXITSTATUS(status) != 0){

1637

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

1638

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

1639

WEXITSTATUS(status));

1640

free(fullname);

1641

continue;

1642

}

1643

} else if(WIFSIGNALED(status)){

1644

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

1645

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

1646

WTERMSIG(status));

1647

free(fullname);

1648

continue;

1649

} else {

1650

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

1651

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

1652

free(fullname);

1653

continue;

1654

}

1655

}

1656

free(fullname);

1657

if(debug){

1658

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

1659

direntry->d_name);

1660

}

1661

}

1662

close(devnull);

1663

}

2083

1664

}

2084

1665

2085

1666

__attribute__((nonnull, warn_unused_result))

2136

1717

/* Raise privileges */

2137

1718

ret_errno = raise_privileges();

2138

1719

if(ret_errno != 0){

2139

errno = ret_errno;

2140

1720

perror_plus("Failed to raise privileges");

2141

1721

}

2142

1722

2246

1826

/* Raise privileges */

2247

1827

ret_errno = raise_privileges();

2248

1828

if(ret_errno != 0){

2249

errno = ret_errno;

2250

1829

perror_plus("Failed to raise privileges");

2251

1830

}

2252

1831

2285

1864

}

2286

1865

2287

1866

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

2288

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

1867

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

2289

1868

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

2290

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

1869

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

2291

1870

.interfaces = NULL, .interfaces_size = 0 };

2292

1871

AvahiSServiceBrowser *sb = NULL;

2293

1872

error_t ret_errno;

2303

1882

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2304

1883

const char *seckey = PATHDIR "/" SECKEY;

2305

1884

const char *pubkey = PATHDIR "/" PUBKEY;

2306

const char *dh_params_file = NULL;

2307

1885

char *interfaces_hooks = NULL;

2308

1886

2309

1887

bool gnutls_initialized = false;

2362

1940

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

2363

1941

" Diffie-Hellman key exchange",

2364

1942

.group = 2 },

2365

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

2366

.arg = "FILE",

2367

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

2368

" for the Diffie-Hellman key exchange",

2369

.group = 2 },

2370

1943

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

2371

1944

.arg = "STRING",

2372

1945

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

2427

2000

}

2428

2001

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

2429

2002

break;

2430

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

2431

dh_params_file = arg;

2432

break;

2433

2003

case 130: /* --priority */

2434

2004

mc.priority = arg;

2435

2005

break;

2491

2061

goto end;

2492

2062

}

2493

2063

}

2494

2064

2495

2065

{

2496

2066

/* Work around Debian bug #633582:

2497

2067

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

2524

2094

TEMP_FAILURE_RETRY(close(seckey_fd));

2525

2095

}

2526

2096

}

2527

2097

2528

2098

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

2529

2099

int pubkey_fd = open(pubkey, O_RDONLY);

2530

2100

if(pubkey_fd == -1){

2545

2115

TEMP_FAILURE_RETRY(close(pubkey_fd));

2546

2116

}

2547

2117

}

2548

2549

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

2550

int dhparams_fd = open(dh_params_file, O_RDONLY);

2551

if(dhparams_fd == -1){

2552

perror_plus("open");

2553

} else {

2554

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

2555

if(ret == -1){

2556

perror_plus("fstat");

2557

} else {

2558

if(S_ISREG(st.st_mode)

2559

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

2560

ret = fchown(dhparams_fd, uid, gid);

2561

if(ret == -1){

2562

perror_plus("fchown");

2563

}

2564

}

2565

}

2566

TEMP_FAILURE_RETRY(close(dhparams_fd));

2567

}

2568

}

2569

2118

2570

2119

/* Lower privileges */

2571

2120

ret_errno = lower_privileges();

2572

2121

if(ret_errno != 0){

2689

2238

2690

2239

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

2691

2240

if(mc.interfaces == NULL){

2692

struct dirent **direntries = NULL;

2241

struct dirent **direntries;

2693

2242

/* Look for any good interfaces */

2694

2243

ret = scandir(sys_class_net, &direntries, good_interface,

2695

2244

alphasort);

2701

2250

if(ret_errno != 0){

2702

2251

errno = ret_errno;

2703

2252

perror_plus("argz_add");

2704

free(direntries[i]);

2705

2253

continue;

2706

2254

}

2707

2255

if(debug){

2708

2256

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

2709

2257

direntries[i]->d_name);

2710

2258

}

2711

free(direntries[i]);

2712

2259

}

2713

2260

free(direntries);

2714

2261

} else {

2715

if(ret == 0){

2716

free(direntries);

2717

}

2262

free(direntries);

2718

2263

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

2719

2264

exitcode = EXIT_FAILURE;

2720

2265

goto end;

2746

2291

errno = bring_up_interface(interface, delay);

2747

2292

if(not interface_was_up){

2748

2293

if(errno != 0){

2749

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

2750

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

2294

perror_plus("Failed to bring up interface");

2751

2295

} else {

2752

2296

errno = argz_add(&interfaces_to_take_down,

2753

2297

&interfaces_to_take_down_size,

2776

2320

goto end;

2777

2321

}

2778

2322

2779

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

2323

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

2780

2324

if(ret == -1){

2781

2325

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

2782

2326

exitcode = EX_UNAVAILABLE;

2985

2529

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

2986

2530

while(mc.current_server != NULL){

2987

2531

server *next = mc.current_server->next;

2988

#ifdef __GNUC__

2989

#pragma GCC diagnostic push

2990

#pragma GCC diagnostic ignored "-Wcast-qual"

2991

#endif

2992

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

2993

#ifdef __GNUC__

2994

#pragma GCC diagnostic pop

2995

#endif

2996

2532

free(mc.current_server);

2997

2533

mc.current_server = next;

2998

2534

}

3002

2538

{

3003

2539

ret_errno = raise_privileges();

3004

2540

if(ret_errno != 0){

3005

errno = ret_errno;

3006

2541

perror_plus("Failed to raise privileges");

3007

2542

} else {

3008

2543

3031

2566

3032

2567

ret_errno = lower_privileges_permanently();

3033

2568

if(ret_errno != 0){

3034

errno = ret_errno;

3035

2569

perror_plus("Failed to lower privileges permanently");

3036

2570

}

3037

2571

}

3042

2576

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

3043

2577

if(tempdir != NULL){

3044

2578

struct dirent **direntries = NULL;

3045

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

3046

| O_NOFOLLOW

3047

| O_DIRECTORY

3048

| O_PATH));

3049

if(tempdir_fd == -1){

3050

perror_plus("open");

3051

} else {

3052

#ifdef __GLIBC__

3053

#if __GLIBC_PREREQ(2, 15)

3054

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

3055

notdotentries, alphasort);

3056

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

3057

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

3058

alphasort);

3059

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

3060

#else /* not __GLIBC__ */

3061

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

3062

alphasort);

3063

#endif /* not __GLIBC__ */

3064

if(numentries >= 0){

3065

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

3066

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

3067

if(ret == -1){

3068

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

3069

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

3070

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

3071

}

3072

free(direntries[i]);

3073

}

3074

3075

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

3076

free(direntries);

3077

if(numentries == -1){

3078

perror_plus("scandir");

3079

}

3080

ret = rmdir(tempdir);

3081

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

3082

perror_plus("rmdir");

3083

}

2579

struct dirent *direntry = NULL;

2580

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

2581

alphasort);

2582

if(numentries > 0){

2583

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

2584

direntry = direntries[i];

2585

char *fullname = NULL;

2586

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

2587

direntry->d_name);

2588

if(ret < 0){

2589

perror_plus("asprintf");

2590

continue;

2591

}

2592

ret = remove(fullname);

2593

if(ret == -1){

2594

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

2595

strerror(errno));

2596

}

2597

free(fullname);

3084

2598

}

3085

TEMP_FAILURE_RETRY(close(tempdir_fd));

2599

}

2600

2601

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

2602

free(direntries);

2603

if(numentries == -1){

2604

perror_plus("scandir");

2605

}

2606

ret = rmdir(tempdir);

2607

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

2608

perror_plus("rmdir");

3086

2609

}

3087

2610

}

3088

2611