/mandos/trunk : revision 776

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

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,

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

free(new_server->ip);

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

244

251

free(new_server);

245

252

return false;

246

253

}

298

305

return false;

299

306

}

300

307

301

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

308

ret = close(fd);

302

309

if(ret == -1){

303

310

perror_plus("close");

304

311

}

486

493

return plaintext_length;

487

494

}

488

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

489

503

__attribute__((warn_unused_result))

490

504

static const char *safer_gnutls_strerror(int value){

491

505

const char *ret = gnutls_strerror(value);

492

if(ret == NULL)

493

ret = "(unknown)";

494

return ret;

506

return safe_string(ret);

495

507

}

496

508

497

509

/* GnuTLS log function callback */

504

516

__attribute__((nonnull, warn_unused_result))

505

517

static int init_gnutls_global(const char *pubkeyfilename,

506

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

507

520

mandos_context *mc){

508

521

int ret;

522

unsigned int uret;

509

523

510

524

if(debug){

511

525

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

562

576

safer_gnutls_strerror(ret));

563

577

goto globalfail;

564

578

}

565

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

566

if(ret != GNUTLS_E_SUCCESS){

567

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

568

safer_gnutls_strerror(ret));

569

goto globalfail;

570

}

571

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

}

572

751

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

573

752

574

753

return 0;

634

813

/* ignore client certificate if any. */

635

814

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

636

815

637

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

638

639

816

return 0;

640

817

}

641

818

643

820

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

644

821

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

645

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

646

1041

/* Called when a Mandos server is found */

647

1042

__attribute__((nonnull, warn_unused_result))

648

1043

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

659

1054

int retval = -1;

660

1055

gnutls_session_t session;

661

1056

int pf; /* Protocol family */

1057

bool route_added = false;

662

1058

663

1059

errno = 0;

664

1060

722

1118

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

723

1119

}

724

1120

725

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

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

726

1122

if(tcp_sd < 0){

727

1123

int e = errno;

728

1124

perror_plus("socket");

735

1131

goto mandos_end;

736

1132

}

737

1133

738

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

739

1134

if(af == AF_INET6){

740

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

741

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);

742

1138

} else { /* IPv4 */

743

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

744

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);

745

1142

}

746

1143

if(ret < 0 ){

747

1144

int e = errno;

817

1214

goto mandos_end;

818

1215

}

819

1216

820

if(af == AF_INET6){

821

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

822

sizeof(struct sockaddr_in6));

823

} else {

824

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

825

sizeof(struct sockaddr_in));

826

}

827

if(ret < 0){

828

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

829

int e = errno;

830

perror_plus("connect");

831

errno = e;

832

}

833

goto mandos_end;

834

}

835

836

if(quit_now){

837

errno = EINTR;

838

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;

839

1272

}

840

1273

841

1274

const char *out = mandos_protocol_version;

1024

1457

1025

1458

mandos_end:

1026

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

}

1027

1466

int e = errno;

1028

1467

free(decrypted_buffer);

1029

1468

free(buffer);

1030

1469

if(tcp_sd >= 0){

1031

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

1470

ret = close(tcp_sd);

1032

1471

}

1033

1472

if(ret == -1){

1034

1473

if(e == 0){

1069

1508

timed out */

1070

1509

1071

1510

if(quit_now){

1511

avahi_s_service_resolver_free(r);

1072

1512

return;

1073

1513

}

1074

1514

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

}

1465

errno = old_errno;

1466

return ret_errno;

1467

}

1468

1469

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

1470

__attribute__((warn_unused_result))

1471

error_t raise_privileges_permanently(void){

1472

error_t old_errno = errno;

1473

error_t ret_errno = raise_privileges();

1474

if(ret_errno != 0){

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

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

1479

ret_errno = errno;

1480

}

1481

errno = old_errno;

1482

return ret_errno;

1483

}

1484

1485

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

1486

__attribute__((warn_unused_result))

1487

error_t lower_privileges(void){

1488

error_t old_errno = errno;

1489

error_t ret_errno = 0;

1490

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

1491

ret_errno = errno;

1492

}

1493

errno = old_errno;

1494

return ret_errno;

1495

}

1496

1497

/* Lower privileges permanently */

1498

__attribute__((warn_unused_result))

1499

error_t lower_privileges_permanently(void){

1500

error_t old_errno = errno;

1501

error_t ret_errno = 0;

1502

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

1503

ret_errno = errno;

1504

}

1505

errno = old_errno;

1506

return ret_errno;

1507

}

1508

1509

1897

__attribute__((nonnull))

1510

1898

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

1511

1899

const float delay){

1512

1900

struct dirent **direntries = NULL;

1513

1901

if(hookdir_fd == -1){

1514

hookdir_fd = open(hookdir, O_RDONLY);

1902

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1903

| O_CLOEXEC);

1515

1904

if(hookdir_fd == -1){

1516

1905

if(errno == ENOENT){

1517

1906

if(debug){

1542

1931

}

1543

1932

struct dirent *direntry;

1544

1933

int ret;

1545

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

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

}

1546

1939

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

1547

1940

direntry = direntries[i];

1548

1941

if(debug){

1572

1965

perror_plus("setgroups");

1573

1966

_exit(EX_NOPERM);

1574

1967

}

1575

ret = dup2(devnull, STDIN_FILENO);

1576

if(ret == -1){

1577

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

1578

_exit(EX_OSERR);

1579

}

1580

ret = close(devnull);

1581

if(ret == -1){

1582

perror_plus("close");

1583

_exit(EX_OSERR);

1584

}

1585

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1586

if(ret == -1){

1587

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

1588

_exit(EX_OSERR);

1589

}

1590

1968

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

1591

1969

if(ret == -1){

1592

1970

perror_plus("setenv");

1627

2005

_exit(EX_OSERR);

1628

2006

}

1629

2007

}

1630

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

1631

2011

if(hook_fd == -1){

1632

2012

perror_plus("openat");

1633

2013

_exit(EXIT_FAILURE);

1634

2014

}

1635

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

2015

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

1636

2016

perror_plus("close");

1637

2017

_exit(EXIT_FAILURE);

1638

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

}

1639

2034

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

1640

2035

environ) == -1){

1641

2036

perror_plus("fexecve");

1642

2037

_exit(EXIT_FAILURE);

1643

2038

}

1644

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

1645

2045

int status;

1646

2046

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

1647

2047

perror_plus("waitpid");

2048

free(direntry);

1648

2049

continue;

1649

2050

}

1650

2051

if(WIFEXITED(status)){

1652

2053

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

1653

2054

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

1654

2055

WEXITSTATUS(status));

2056

free(direntry);

1655

2057

continue;

1656

2058

}

1657

2059

} else if(WIFSIGNALED(status)){

1658

2060

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

1659

2061

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

1660

2062

WTERMSIG(status));

2063

free(direntry);

1661

2064

continue;

1662

2065

} else {

1663

2066

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

1664

2067

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

2068

free(direntry);

1665

2069

continue;

1666

2070

}

1667

2071

}

1669

2073

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

1670

2074

direntry->d_name);

1671

2075

}

2076

free(direntry);

1672

2077

}

1673

2078

free(direntries);

1674

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

2079

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

1675

2080

perror_plus("close");

1676

2081

} else {

1677

2082

hookdir_fd = -1;

1717

2122

}

1718

2123

1719

2124

if(quit_now){

1720

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

2125

ret = close(sd);

1721

2126

if(ret == -1){

1722

2127

perror_plus("close");

1723

2128

}

1773

2178

}

1774

2179

1775

2180

/* Close the socket */

1776

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

2181

ret = close(sd);

1777

2182

if(ret == -1){

1778

2183

perror_plus("close");

1779

2184

}

1861

2266

}

1862

2267

1863

2268

/* Close the socket */

1864

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

2269

int ret = close(sd);

1865

2270

if(ret == -1){

1866

2271

perror_plus("close");

1867

2272

}

1882

2287

}

1883

2288

1884

2289

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

1885

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

2290

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

1886

2291

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

1887

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

2292

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

1888

2293

.interfaces = NULL, .interfaces_size = 0 };

1889

2294

AvahiSServiceBrowser *sb = NULL;

1890

2295

error_t ret_errno;

1900

2305

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1901

2306

const char *seckey = PATHDIR "/" SECKEY;

1902

2307

const char *pubkey = PATHDIR "/" PUBKEY;

2308

const char *dh_params_file = NULL;

1903

2309

char *interfaces_hooks = NULL;

1904

2310

1905

2311

bool gnutls_initialized = false;

1958

2364

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

1959

2365

" Diffie-Hellman key exchange",

1960

2366

.group = 2 },

2367

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

2368

.arg = "FILE",

2369

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

2370

" for the Diffie-Hellman key exchange",

2371

.group = 2 },

1961

2372

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

1962

2373

.arg = "STRING",

1963

2374

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

2018

2429

}

2019

2430

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

2020

2431

break;

2432

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

2433

dh_params_file = arg;

2434

break;

2021

2435

case 130: /* --priority */

2022

2436

mc.priority = arg;

2023

2437

break;

2079

2493

goto end;

2080

2494

}

2081

2495

}

2082

2496

2083

2497

{

2084

2498

/* Work around Debian bug #633582:

2085

2499

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

2109

2523

}

2110

2524

}

2111

2525

}

2112

TEMP_FAILURE_RETRY(close(seckey_fd));

2526

close(seckey_fd);

2113

2527

}

2114

2528

}

2115

2529

2116

2530

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

2117

2531

int pubkey_fd = open(pubkey, O_RDONLY);

2118

2532

if(pubkey_fd == -1){

2130

2544

}

2131

2545

}

2132

2546

}

2133

TEMP_FAILURE_RETRY(close(pubkey_fd));

2134

}

2135

}

2136

2547

close(pubkey_fd);

2548

}

2549

}

2550

2551

if(dh_params_file != NULL

2552

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

2553

int dhparams_fd = open(dh_params_file, O_RDONLY);

2554

if(dhparams_fd == -1){

2555

perror_plus("open");

2556

} else {

2557

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

2558

if(ret == -1){

2559

perror_plus("fstat");

2560

} else {

2561

if(S_ISREG(st.st_mode)

2562

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

2563

ret = fchown(dhparams_fd, uid, gid);

2564

if(ret == -1){

2565

perror_plus("fchown");

2566

}

2567

}

2568

}

2569

close(dhparams_fd);

2570

}

2571

}

2572

2137

2573

/* Lower privileges */

2138

2574

ret_errno = lower_privileges();

2139

2575

if(ret_errno != 0){

2268

2704

if(ret_errno != 0){

2269

2705

errno = ret_errno;

2270

2706

perror_plus("argz_add");

2707

free(direntries[i]);

2271

2708

continue;

2272

2709

}

2273

2710

if(debug){

2274

2711

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

2275

2712

direntries[i]->d_name);

2276

2713

}

2714

free(direntries[i]);

2277

2715

}

2278

2716

free(direntries);

2279

2717

} else {

2311

2749

errno = bring_up_interface(interface, delay);

2312

2750

if(not interface_was_up){

2313

2751

if(errno != 0){

2314

perror_plus("Failed to bring up interface");

2752

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

2753

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

2315

2754

} else {

2316

2755

errno = argz_add(&interfaces_to_take_down,

2317

2756

&interfaces_to_take_down_size,

2340

2779

goto end;

2341

2780

}

2342

2781

2343

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

2782

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

2344

2783

if(ret == -1){

2345

2784

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

2346

2785

exitcode = EX_UNAVAILABLE;

2549

2988

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

2550

2989

while(mc.current_server != NULL){

2551

2990

server *next = mc.current_server->next;

2991

#ifdef __GNUC__

2992

#pragma GCC diagnostic push

2993

#pragma GCC diagnostic ignored "-Wcast-qual"

2994

#endif

2995

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

2996

#ifdef __GNUC__

2997

#pragma GCC diagnostic pop

2998

#endif

2552

2999

free(mc.current_server);

2553

3000

mc.current_server = next;

2554

3001

}

2598

3045

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

2599

3046

if(tempdir != NULL){

2600

3047

struct dirent **direntries = NULL;

2601

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

2602

O_NOFOLLOW));

3048

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

3049

| O_NOFOLLOW

3050

| O_DIRECTORY

3051

| O_PATH));

2603

3052

if(tempdir_fd == -1){

2604

3053

perror_plus("open");

2605

3054

} else {

2623

3072

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

2624

3073

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

2625

3074

}

3075

free(direntries[i]);

2626

3076

}

2627

3077

2628

3078

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

2635

3085

perror_plus("rmdir");

2636

3086

}

2637

3087

}

2638

TEMP_FAILURE_RETRY(close(tempdir_fd));

3088

close(tempdir_fd);

2639

3089

}

2640

3090

}

2641

3091