/mandos/release : revision 331

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(), strncpy() */

51

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

52

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

53

sockaddr_in6, PF_INET6,

234

.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

free(new_server);

237

238

return false;

238

239

}

239

240

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

240

241

if(ret == -1){

241

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);

242

252

return false;

243

253

}

244

254

/* Special case of first server */

295

305

return false;

296

306

}

297

307

298

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

308

ret = close(fd);

299

309

if(ret == -1){

300

310

perror_plus("close");

301

311

}

483

493

return plaintext_length;

484

494

}

485

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

486

503

__attribute__((warn_unused_result))

487

504

static const char *safer_gnutls_strerror(int value){

488

505

const char *ret = gnutls_strerror(value);

489

if(ret == NULL)

490

ret = "(unknown)";

491

return ret;

506

return safe_string(ret);

492

507

}

493

508

494

509

/* GnuTLS log function callback */

501

516

__attribute__((nonnull, warn_unused_result))

502

517

static int init_gnutls_global(const char *pubkeyfilename,

503

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

504

520

mandos_context *mc){

505

521

int ret;

522

unsigned int uret;

506

523

507

524

if(debug){

508

525

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

559

576

safer_gnutls_strerror(ret));

560

577

goto globalfail;

561

578

}

562

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

563

if(ret != GNUTLS_E_SUCCESS){

564

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

565

safer_gnutls_strerror(ret));

566

goto globalfail;

567

}

568

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

}

569

751

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

570

752

571

753

return 0;

631

813

/* ignore client certificate if any. */

632

814

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

633

815

634

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

635

636

816

return 0;

637

817

}

638

818

640

820

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

641

821

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

642

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

643

1041

/* Called when a Mandos server is found */

644

1042

__attribute__((nonnull, warn_unused_result))

645

1043

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

656

1054

int retval = -1;

657

1055

gnutls_session_t session;

658

1056

int pf; /* Protocol family */

1057

bool route_added = false;

659

1058

660

1059

errno = 0;

661

1060

719

1118

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

720

1119

}

721

1120

722

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

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

723

1122

if(tcp_sd < 0){

724

1123

int e = errno;

725

1124

perror_plus("socket");

732

1131

goto mandos_end;

733

1132

}

734

1133

735

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

736

1134

if(af == AF_INET6){

737

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

738

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);

739

1138

} else { /* IPv4 */

740

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

741

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);

742

1142

}

743

1143

if(ret < 0 ){

744

1144

int e = errno;

814

1214

goto mandos_end;

815

1215

}

816

1216

817

if(af == AF_INET6){

818

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

819

sizeof(struct sockaddr_in6));

820

} else {

821

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

822

sizeof(struct sockaddr_in));

823

}

824

if(ret < 0){

825

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

826

int e = errno;

827

perror_plus("connect");

828

errno = e;

829

}

830

goto mandos_end;

831

}

832

833

if(quit_now){

834

errno = EINTR;

835

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) or (errno == EHOSTUNREACH))

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;

836

1272

}

837

1273

838

1274

const char *out = mandos_protocol_version;

1021

1457

1022

1458

mandos_end:

1023

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

}

1024

1466

int e = errno;

1025

1467

free(decrypted_buffer);

1026

1468

free(buffer);

1027

1469

if(tcp_sd >= 0){

1028

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

1470

ret = close(tcp_sd);

1029

1471

}

1030

1472

if(ret == -1){

1031

1473

if(e == 0){

1066

1508

timed out */

1067

1509

1068

1510

if(quit_now){

1511

avahi_s_service_resolver_free(r);

1069

1512

return;

1070

1513

}

1071

1514

1194

1637

errno = ret_errno;

1195

1638

return false;

1196

1639

}

1197

strcpy(ifr->ifr_name, ifname);

1640

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

1641

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

1198

1642

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1199

1643

if(ret == -1){

1200

1644

if(debug){

1451

1895

}

1452

1896

}

1453

1897

1454

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

1455

__attribute__((warn_unused_result))

1456

error_t raise_privileges(void){

1457

error_t old_errno = errno;

1458

error_t ret_errno = 0;

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

__attribute__((warn_unused_result))

1469

error_t raise_privileges_permanently(void){

1470

error_t old_errno = errno;

1471

error_t ret_errno = raise_privileges();

1472

if(ret_errno != 0){

1473

errno = old_errno;

1474

return ret_errno;

1475

}

1476

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

1477

ret_errno = errno;

1478

perror_plus("seteuid");

1479

}

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

1484

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

1485

__attribute__((warn_unused_result))

1486

error_t lower_privileges(void){

1487

error_t old_errno = errno;

1488

error_t ret_errno = 0;

1489

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

1490

ret_errno = errno;

1491

perror_plus("seteuid");

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

perror_plus("setuid");

1505

}

1506

errno = old_errno;

1507

return ret_errno;

1508

}

1509

1510

1898

__attribute__((nonnull))

1511

1899

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

1512

1900

const float delay){

1513

1901

struct dirent **direntries = NULL;

1514

1902

if(hookdir_fd == -1){

1515

hookdir_fd = open(hookdir, O_RDONLY);

1903

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1904

| O_CLOEXEC);

1516

1905

if(hookdir_fd == -1){

1517

1906

if(errno == ENOENT){

1518

1907

if(debug){

1543

1932

}

1544

1933

struct dirent *direntry;

1545

1934

int ret;

1546

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

1935

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

1936

if(devnull == -1){

1937

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

1938

return;

1939

}

1547

1940

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

1548

1941

direntry = direntries[i];

1549

1942

if(debug){

1554

1947

if(hook_pid == 0){

1555

1948

/* Child */

1556

1949

/* Raise privileges */

1557

if(raise_privileges_permanently() != 0){

1950

errno = raise_privileges_permanently();

1951

if(errno != 0){

1558

1952

perror_plus("Failed to raise privileges");

1559

1953

_exit(EX_NOPERM);

1560

1954

}

1572

1966

perror_plus("setgroups");

1573

1967

_exit(EX_NOPERM);

1574

1968

}

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

1969

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

1591

1970

if(ret == -1){

1592

1971

perror_plus("setenv");

1627

2006

_exit(EX_OSERR);

1628

2007

}

1629

2008

}

1630

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

2009

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

2010

direntry->d_name,

2011

O_RDONLY));

1631

2012

if(hook_fd == -1){

1632

2013

perror_plus("openat");

1633

2014

_exit(EXIT_FAILURE);

1634

2015

}

1635

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

2016

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

1636

2017

perror_plus("close");

1637

2018

_exit(EXIT_FAILURE);

1638

2019

}

2020

ret = dup2(devnull, STDIN_FILENO);

2021

if(ret == -1){

2022

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

2023

_exit(EX_OSERR);

2024

}

2025

ret = close(devnull);

2026

if(ret == -1){

2027

perror_plus("close");

2028

_exit(EX_OSERR);

2029

}

2030

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2031

if(ret == -1){

2032

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

2033

_exit(EX_OSERR);

2034

}

1639

2035

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

1640

2036

environ) == -1){

1641

2037

perror_plus("fexecve");

1642

2038

_exit(EXIT_FAILURE);

1643

2039

}

1644

2040

} else {

2041

if(hook_pid == -1){

2042

perror_plus("fork");

2043

free(direntry);

2044

continue;

2045

}

1645

2046

int status;

1646

2047

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

1647

2048

perror_plus("waitpid");

2049

free(direntry);

1648

2050

continue;

1649

2051

}

1650

2052

if(WIFEXITED(status)){

1652

2054

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

1653

2055

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

1654

2056

WEXITSTATUS(status));

2057

free(direntry);

1655

2058

continue;

1656

2059

}

1657

2060

} else if(WIFSIGNALED(status)){

1658

2061

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

1659

2062

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

1660

2063

WTERMSIG(status));

2064

free(direntry);

1661

2065

continue;

1662

2066

} else {

1663

2067

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

1664

2068

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

2069

free(direntry);

1665

2070

continue;

1666

2071

}

1667

2072

}

1669

2074

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

1670

2075

direntry->d_name);

1671

2076

}

2077

free(direntry);

1672

2078

}

1673

2079

free(direntries);

1674

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

2080

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

1675

2081

perror_plus("close");

1676

2082

} else {

1677

2083

hookdir_fd = -1;

1717

2123

}

1718

2124

1719

2125

if(quit_now){

1720

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

2126

ret = close(sd);

1721

2127

if(ret == -1){

1722

2128

perror_plus("close");

1723

2129

}

1733

2139

/* Raise privileges */

1734

2140

ret_errno = raise_privileges();

1735

2141

if(ret_errno != 0){

2142

errno = ret_errno;

1736

2143

perror_plus("Failed to raise privileges");

1737

2144

}

1738

2145

1772

2179

}

1773

2180

1774

2181

/* Close the socket */

1775

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

2182

ret = close(sd);

1776

2183

if(ret == -1){

1777

2184

perror_plus("close");

1778

2185

}

1842

2249

/* Raise privileges */

1843

2250

ret_errno = raise_privileges();

1844

2251

if(ret_errno != 0){

2252

errno = ret_errno;

1845

2253

perror_plus("Failed to raise privileges");

1846

2254

}

1847

2255

1859

2267

}

1860

2268

1861

2269

/* Close the socket */

1862

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

2270

int ret = close(sd);

1863

2271

if(ret == -1){

1864

2272

perror_plus("close");

1865

2273

}

1880

2288

}

1881

2289

1882

2290

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

1883

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

1884

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

1885

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

1886

.interfaces = NULL, .interfaces_size = 0 };

2291

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

2292

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

2293

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

2294

.current_server = NULL, .interfaces = NULL,

2295

.interfaces_size = 0 };

1887

2296

AvahiSServiceBrowser *sb = NULL;

1888

2297

error_t ret_errno;

1889

2298

int ret;

1898

2307

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1899

2308

const char *seckey = PATHDIR "/" SECKEY;

1900

2309

const char *pubkey = PATHDIR "/" PUBKEY;

2310

const char *dh_params_file = NULL;

1901

2311

char *interfaces_hooks = NULL;

1902

2312

1903

2313

bool gnutls_initialized = false;

1956

2366

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

1957

2367

" Diffie-Hellman key exchange",

1958

2368

.group = 2 },

2369

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

2370

.arg = "FILE",

2371

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

2372

" for the Diffie-Hellman key exchange",

2373

.group = 2 },

1959

2374

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

1960

2375

.arg = "STRING",

1961

2376

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

2016

2431

}

2017

2432

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

2018

2433

break;

2434

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

2435

dh_params_file = arg;

2436

break;

2019

2437

case 130: /* --priority */

2020

2438

mc.priority = arg;

2021

2439

break;

2077

2495

goto end;

2078

2496

}

2079

2497

}

2080

2498

2081

2499

{

2082

2500

/* Work around Debian bug #633582:

2083

2501

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

2107

2525

}

2108

2526

}

2109

2527

}

2110

TEMP_FAILURE_RETRY(close(seckey_fd));

2528

close(seckey_fd);

2111

2529

}

2112

2530

}

2113

2531

2114

2532

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

2115

2533

int pubkey_fd = open(pubkey, O_RDONLY);

2116

2534

if(pubkey_fd == -1){

2128

2546

}

2129

2547

}

2130

2548

}

2131

TEMP_FAILURE_RETRY(close(pubkey_fd));

2132

}

2133

}

2134

2549

close(pubkey_fd);

2550

}

2551

}

2552

2553

if(dh_params_file != NULL

2554

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

2555

int dhparams_fd = open(dh_params_file, O_RDONLY);

2556

if(dhparams_fd == -1){

2557

perror_plus("open");

2558

} else {

2559

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

2560

if(ret == -1){

2561

perror_plus("fstat");

2562

} else {

2563

if(S_ISREG(st.st_mode)

2564

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

2565

ret = fchown(dhparams_fd, uid, gid);

2566

if(ret == -1){

2567

perror_plus("fchown");

2568

}

2569

}

2570

}

2571

close(dhparams_fd);

2572

}

2573

}

2574

2135

2575

/* Lower privileges */

2136

2576

ret_errno = lower_privileges();

2137

2577

if(ret_errno != 0){

2266

2706

if(ret_errno != 0){

2267

2707

errno = ret_errno;

2268

2708

perror_plus("argz_add");

2709

free(direntries[i]);

2269

2710

continue;

2270

2711

}

2271

2712

if(debug){

2272

2713

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

2273

2714

direntries[i]->d_name);

2274

2715

}

2716

free(direntries[i]);

2275

2717

}

2276

2718

free(direntries);

2277

2719

} else {

2309

2751

errno = bring_up_interface(interface, delay);

2310

2752

if(not interface_was_up){

2311

2753

if(errno != 0){

2312

perror_plus("Failed to bring up interface");

2754

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

2755

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

2313

2756

} else {

2314

2757

errno = argz_add(&interfaces_to_take_down,

2315

2758

&interfaces_to_take_down_size,

2338

2781

goto end;

2339

2782

}

2340

2783

2341

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

2784

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

2342

2785

if(ret == -1){

2343

2786

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

2344

2787

exitcode = EX_UNAVAILABLE;

2547

2990

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

2548

2991

while(mc.current_server != NULL){

2549

2992

server *next = mc.current_server->next;

2993

#ifdef __GNUC__

2994

#pragma GCC diagnostic push

2995

#pragma GCC diagnostic ignored "-Wcast-qual"

2996

#endif

2997

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

2998

#ifdef __GNUC__

2999

#pragma GCC diagnostic pop

3000

#endif

2550

3001

free(mc.current_server);

2551

3002

mc.current_server = next;

2552

3003

}

2556

3007

{

2557

3008

ret_errno = raise_privileges();

2558

3009

if(ret_errno != 0){

3010

errno = ret_errno;

2559

3011

perror_plus("Failed to raise privileges");

2560

3012

} else {

2561

3013

2584

3036

2585

3037

ret_errno = lower_privileges_permanently();

2586

3038

if(ret_errno != 0){

3039

errno = ret_errno;

2587

3040

perror_plus("Failed to lower privileges permanently");

2588

3041

}

2589

3042

}

2594

3047

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

2595

3048

if(tempdir != NULL){

2596

3049

struct dirent **direntries = NULL;

2597

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

2598

O_NOFOLLOW));

3050

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

3051

| O_NOFOLLOW

3052

| O_DIRECTORY

3053

| O_PATH));

2599

3054

if(tempdir_fd == -1){

2600

3055

perror_plus("open");

2601

3056

} else {

2619

3074

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

2620

3075

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

2621

3076

}

3077

free(direntries[i]);

2622

3078

}

2623

3079

2624

3080

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

2631

3087

perror_plus("rmdir");

2632

3088

}

2633

3089

}

2634

TEMP_FAILURE_RETRY(close(tempdir_fd));

3090

close(tempdir_fd);

2635

3091

}

2636

3092

}

2637

3093