/mandos/trunk : revision 738.1.6

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

42

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

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

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

45

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

46

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

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

61

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

62

*/

63

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

73

*/

74

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

75

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

76

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

76

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

77

unlinkat() */

77

78

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

78

79

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

79

80

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

141

142

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

142

143

char *connect_to = NULL;

143

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

144

146

uid_t uid = 65534;

145

147

gid_t gid = 65534;

146

148

183

185

perror(print_text);

184

186

}

185

187

186

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

188

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

187

189

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

188

190

va_list ap;

189

191

va_start (ap, format);

198

200

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

199

201

* "buffer_length" is how much is already used.

200

202

*/

203

__attribute__((nonnull, warn_unused_result))

201

204

size_t incbuffer(char **buffer, size_t buffer_length,

202

205

size_t buffer_capacity){

203

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

216

219

}

217

220

218

221

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

222

__attribute__((nonnull, warn_unused_result))

219

223

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

220

224

int af, server **current_server){

221

225

int ret;

230

234

.af = af };

231

235

if(new_server->ip == NULL){

232

236

perror_plus("strdup");

237

free(new_server);

233

238

return false;

234

239

}

235

240

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

236

241

if(ret == -1){

237

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);

238

252

return false;

239

253

}

240

254

/* Special case of first server */

242

256

new_server->next = new_server;

243

257

new_server->prev = new_server;

244

258

*current_server = new_server;

245

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

246

259

} else {

260

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

247

261

new_server->next = *current_server;

248

262

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

249

263

new_server->prev->next = new_server;

255

269

/*

256

270

* Initialize GPGME.

257

271

*/

258

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

259

const char *tempdir, mandos_context *mc){

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

260

277

gpgme_error_t rc;

261

278

gpgme_engine_info_t engine_info;

262

279

263

280

/*

264

281

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

265

282

*/

266

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

267

284

int ret;

268

285

int fd;

269

286

gpgme_data_t pgp_data;

350

367

* Decrypt OpenPGP data.

351

368

* Returns -1 on error

352

369

*/

370

__attribute__((nonnull, warn_unused_result))

353

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

354

372

size_t crypto_size,

355

373

char **plaintext,

475

493

return plaintext_length;

476

494

}

477

495

478

static const char * safer_gnutls_strerror(int value){

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

479

498

const char *ret = gnutls_strerror(value);

480

499

if(ret == NULL)

481

500

ret = "(unknown)";

483

502

}

484

503

485

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

486

506

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

487

507

const char* string){

488

508

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

489

509

}

490

510

511

__attribute__((nonnull, warn_unused_result))

491

512

static int init_gnutls_global(const char *pubkeyfilename,

492

513

const char *seckeyfilename,

493

514

mandos_context *mc){

567

588

return -1;

568

589

}

569

590

591

__attribute__((nonnull, warn_unused_result))

570

592

static int init_gnutls_session(gnutls_session_t *session,

571

593

mandos_context *mc){

572

594

int ret;

628

650

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

629

651

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

630

652

653

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

654

__attribute__((warn_unused_result))

655

error_t raise_privileges(void){

656

error_t old_errno = errno;

657

error_t ret_errno = 0;

658

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

659

ret_errno = errno;

660

}

661

errno = old_errno;

662

return ret_errno;

663

}

664

665

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

666

__attribute__((warn_unused_result))

667

error_t raise_privileges_permanently(void){

668

error_t old_errno = errno;

669

error_t ret_errno = raise_privileges();

670

if(ret_errno != 0){

671

errno = old_errno;

672

return ret_errno;

673

}

674

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

675

ret_errno = errno;

676

}

677

errno = old_errno;

678

return ret_errno;

679

}

680

681

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

682

__attribute__((warn_unused_result))

683

error_t lower_privileges(void){

684

error_t old_errno = errno;

685

error_t ret_errno = 0;

686

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

687

ret_errno = errno;

688

}

689

errno = old_errno;

690

return ret_errno;

691

}

692

693

/* Lower privileges permanently */

694

__attribute__((warn_unused_result))

695

error_t lower_privileges_permanently(void){

696

error_t old_errno = errno;

697

error_t ret_errno = 0;

698

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

699

ret_errno = errno;

700

}

701

errno = old_errno;

702

return ret_errno;

703

}

704

705

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

706

__attribute__((nonnull, warn_unused_result))

707

static bool add_delete_local_route(const bool add,

708

const char *address,

709

AvahiIfIndex if_index){

710

int ret;

711

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

712

char add_arg[] = "add";

713

char delete_arg[] = "delete";

714

char debug_flag[] = "--debug";

715

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

716

if(pluginhelperdir == NULL){

717

if(debug){

718

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

719

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

720

}

721

return false;

722

}

723

724

char interface[IF_NAMESIZE];

725

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

726

perror_plus("if_indextoname");

727

return false;

728

}

729

730

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

731

if(devnull == -1){

732

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

733

return false;

734

}

735

pid_t pid = fork();

736

if(pid == 0){

737

/* Child */

738

/* Raise privileges */

739

errno = raise_privileges_permanently();

740

if(errno != 0){

741

perror_plus("Failed to raise privileges");

742

/* _exit(EX_NOPERM); */

743

} else {

744

/* Set group */

745

errno = 0;

746

ret = setgid(0);

747

if(ret == -1){

748

perror_plus("setgid");

749

_exit(EX_NOPERM);

750

}

751

/* Reset supplementary groups */

752

errno = 0;

753

ret = setgroups(0, NULL);

754

if(ret == -1){

755

perror_plus("setgroups");

756

_exit(EX_NOPERM);

757

}

758

}

759

ret = dup2(devnull, STDIN_FILENO);

760

if(ret == -1){

761

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

762

_exit(EX_OSERR);

763

}

764

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

765

if(ret == -1){

766

perror_plus("close");

767

_exit(EX_OSERR);

768

}

769

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

770

if(ret == -1){

771

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

772

_exit(EX_OSERR);

773

}

774

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

775

O_RDONLY

776

| O_DIRECTORY

777

| O_PATH

778

| O_CLOEXEC));

779

if(helperdir_fd == -1){

780

perror_plus("open");

781

_exit(EX_UNAVAILABLE);

782

}

783

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

784

helper, O_RDONLY));

785

if(helper_fd == -1){

786

perror_plus("openat");

787

_exit(EX_UNAVAILABLE);

788

}

789

TEMP_FAILURE_RETRY(close(helperdir_fd));

790

#ifdef __GNUC__

791

#pragma GCC diagnostic push

792

#pragma GCC diagnostic ignored "-Wcast-qual"

793

#endif

794

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

795

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

796

interface, debug ? debug_flag : NULL, NULL },

797

environ) == -1){

798

#ifdef __GNUC__

799

#pragma GCC diagnostic pop

800

#endif

801

perror_plus("fexecve");

802

_exit(EXIT_FAILURE);

803

}

804

}

805

if(pid == -1){

806

perror_plus("fork");

807

return false;

808

}

809

int status;

810

pid_t pret = -1;

811

errno = 0;

812

do {

813

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

814

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

815

int errno_raising = 0;

816

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

817

errno_raising = errno;

818

perror_plus("Failed to raise privileges in order to"

819

" kill helper program");

820

}

821

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

822

perror_plus("kill");

823

}

824

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

825

perror_plus("Failed to lower privileges after killing"

826

" helper program");

827

}

828

return false;

829

}

830

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

831

if(pret == -1){

832

perror_plus("waitpid");

833

return false;

834

}

835

if(WIFEXITED(status)){

836

if(WEXITSTATUS(status) != 0){

837

fprintf_plus(stderr, "Error: iprouteadddel exited"

838

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

839

return false;

840

}

841

return true;

842

}

843

if(WIFSIGNALED(status)){

844

fprintf_plus(stderr, "Error: iprouteadddel died by"

845

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

846

return false;

847

}

848

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

849

return false;

850

}

851

852

__attribute__((nonnull, warn_unused_result))

853

static bool add_local_route(const char *address,

854

AvahiIfIndex if_index){

855

if(debug){

856

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

857

}

858

return add_delete_local_route(true, address, if_index);

859

}

860

861

__attribute__((nonnull, warn_unused_result))

862

static bool delete_local_route(const char *address,

863

AvahiIfIndex if_index){

864

if(debug){

865

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

866

}

867

return add_delete_local_route(false, address, if_index);

868

}

869

631

870

/* Called when a Mandos server is found */

871

__attribute__((nonnull, warn_unused_result))

632

872

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

633

873

AvahiIfIndex if_index,

634

874

int af, mandos_context *mc){

643

883

int retval = -1;

644

884

gnutls_session_t session;

645

885

int pf; /* Protocol family */

886

bool route_added = false;

646

887

647

888

errno = 0;

648

889

706

947

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

707

948

}

708

949

709

tcp_sd = socket(pf, SOCK_STREAM, 0);

950

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

710

951

if(tcp_sd < 0){

711

952

int e = errno;

712

953

perror_plus("socket");

740

981

goto mandos_end;

741

982

}

742

983

if(af == AF_INET6){

743

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

984

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

744

985

if(IN6_IS_ADDR_LINKLOCAL

745

986

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

746

987

if(if_index == AVAHI_IF_UNSPEC){

801

1042

goto mandos_end;

802

1043

}

803

1044

804

if(af == AF_INET6){

805

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

806

sizeof(struct sockaddr_in6));

807

} else {

808

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

809

sizeof(struct sockaddr_in));

810

}

811

if(ret < 0){

812

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

813

int e = errno;

814

perror_plus("connect");

815

errno = e;

816

}

817

goto mandos_end;

818

}

819

820

if(quit_now){

821

errno = EINTR;

822

goto mandos_end;

1045

while(true){

1046

if(af == AF_INET6){

1047

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

1048

sizeof(struct sockaddr_in6));

1049

} else {

1050

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

1051

sizeof(struct sockaddr_in));

1052

}

1053

if(ret < 0){

1054

if(errno == ENETUNREACH

1055

and if_index != AVAHI_IF_UNSPEC

1056

and connect_to == NULL

1057

and not route_added and

1058

((af == AF_INET6 and not

1059

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1060

&to)->sin6_addr)))

1061

or (af == AF_INET and

1062

/* Not a a IPv4LL address */

1063

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

1064

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

1065

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

1066

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

1067

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

1068

connect to a Mandos server announced by Avahi on a server

1069

host with a global address. Work around this by retrying

1070

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

1071

1072

Avahi bug reference:

1073

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

1074

https://bugs.debian.org/587961

1075

*/

1076

if(debug){

1077

fprintf_plus(stderr, "Mandos server unreachable, trying"

1078

" direct route\n");

1079

}

1080

int e = errno;

1081

route_added = add_local_route(ip, if_index);

1082

if(route_added){

1083

continue;

1084

}

1085

errno = e;

1086

}

1087

if(errno != ECONNREFUSED or debug){

1088

int e = errno;

1089

perror_plus("connect");

1090

errno = e;

1091

}

1092

goto mandos_end;

1093

}

1094

1095

if(quit_now){

1096

errno = EINTR;

1097

goto mandos_end;

1098

}

1099

break;

823

1100

}

824

1101

825

1102

const char *out = mandos_protocol_version;

1008

1285

1009

1286

mandos_end:

1010

1287

{

1288

if(route_added){

1289

if(not delete_local_route(ip, if_index)){

1290

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

1291

" interface %d", ip, if_index);

1292

}

1293

}

1011

1294

int e = errno;

1012

1295

free(decrypted_buffer);

1013

1296

free(buffer);

1030

1313

return retval;

1031

1314

}

1032

1315

1316

__attribute__((nonnull))

1033

1317

static void resolve_callback(AvahiSServiceResolver *r,

1034

1318

AvahiIfIndex interface,

1035

1319

AvahiProtocol proto,

1043

1327

AVAHI_GCC_UNUSED AvahiStringList *txt,

1044

1328

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1045

1329

flags,

1046

void* mc){

1330

void *mc){

1047

1331

if(r == NULL){

1048

1332

return;

1049

1333

}

1052

1336

timed out */

1053

1337

1054

1338

if(quit_now){

1339

avahi_s_service_resolver_free(r);

1055

1340

return;

1056

1341

}

1057

1342

1102

1387

const char *domain,

1103

1388

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1104

1389

flags,

1105

void* mc){

1390

void *mc){

1106

1391

if(b == NULL){

1107

1392

return;

1108

1393

}

1168

1453

errno = old_errno;

1169

1454

}

1170

1455

1456

__attribute__((nonnull, warn_unused_result))

1171

1457

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

1172

1458

int ret;

1173

1459

error_t ret_errno;

1192

1478

return true;

1193

1479

}

1194

1480

1481

__attribute__((nonnull, warn_unused_result))

1195

1482

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

1196

1483

1197

1484

/* Reject the loopback device */

1239

1526

* corresponds to an acceptable network device.

1240

1527

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

1241

1528

*/

1529

__attribute__((nonnull, warn_unused_result))

1242

1530

int good_interface(const struct dirent *if_entry){

1243

1531

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

1244

1532

return 0;

1262

1550

/*

1263

1551

* This function determines if a network interface is up.

1264

1552

*/

1553

__attribute__((nonnull, warn_unused_result))

1265

1554

bool interface_is_up(const char *interface){

1266

1555

struct ifreq ifr;

1267

1556

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

1278

1567

/*

1279

1568

* This function determines if a network interface is running

1280

1569

*/

1570

__attribute__((nonnull, warn_unused_result))

1281

1571

bool interface_is_running(const char *interface){

1282

1572

struct ifreq ifr;

1283

1573

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

1291

1581

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

1292

1582

}

1293

1583

1584

__attribute__((nonnull, pure, warn_unused_result))

1294

1585

int notdotentries(const struct dirent *direntry){

1295

1586

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

1296

1587

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

1303

1594

}

1304

1595

1305

1596

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

1597

__attribute__((nonnull, warn_unused_result))

1306

1598

int runnable_hook(const struct dirent *direntry){

1307

1599

int ret;

1308

1600

size_t sret;

1316

1608

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

1317

1609

"abcdefghijklmnopqrstuvwxyz"

1318

1610

"0123456789"

1319

"_-");

1611

"_.-");

1320

1612

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

1321

1613

/* Contains non-allowed characters */

1322

1614

if(debug){

1326

1618

return 0;

1327

1619

}

1328

1620

1329

char *fullname = NULL;

1330

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

1331

if(ret < 0){

1332

perror_plus("asprintf");

1333

return 0;

1334

}

1335

1336

ret = stat(fullname, &st);

1621

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

1337

1622

if(ret == -1){

1338

1623

if(debug){

1339

1624

perror_plus("Could not stat hook");

1363

1648

return 1;

1364

1649

}

1365

1650

1651

__attribute__((nonnull, warn_unused_result))

1366

1652

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1367

1653

mandos_context *mc){

1368

1654

int ret;

1372

1658

1373

1659

while(true){

1374

1660

if(mc->current_server == NULL){

1375

if (debug){

1661

if(debug){

1376

1662

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

1377

1663

" No timeout!\n");

1378

1664

}

1379

1665

ret = avahi_simple_poll_iterate(s, -1);

1380

1666

} else {

1381

if (debug){

1667

if(debug){

1382

1668

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

1383

1669

" it, or wait\n");

1384

1670

}

1401

1687

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

1402

1688

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

1403

1689

1404

if (debug){

1690

if(debug){

1405

1691

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

1406

1692

block_time);

1407

1693

}

1429

1715

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

1430

1716

}

1431

1717

if(ret != 0){

1432

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

1718

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

1433

1719

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

1434

1720

}

1435

1721

}

1436

1722

}

1437

1723

}

1438

1724

1439

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

1440

error_t raise_privileges(void){

1441

error_t old_errno = errno;

1442

error_t ret_errno = 0;

1443

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

1444

ret_errno = errno;

1445

perror_plus("seteuid");

1446

}

1447

errno = old_errno;

1448

return ret_errno;

1449

}

1450

1451

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

1452

error_t raise_privileges_permanently(void){

1453

error_t old_errno = errno;

1454

error_t ret_errno = raise_privileges();

1455

if(ret_errno != 0){

1456

errno = old_errno;

1457

return ret_errno;

1458

}

1459

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

1460

ret_errno = errno;

1461

perror_plus("seteuid");

1462

}

1463

errno = old_errno;

1464

return ret_errno;

1465

}

1466

1467

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

1468

error_t lower_privileges(void){

1469

error_t old_errno = errno;

1470

error_t ret_errno = 0;

1471

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

1472

ret_errno = errno;

1473

perror_plus("seteuid");

1474

}

1475

errno = old_errno;

1476

return ret_errno;

1477

}

1478

1479

/* Lower privileges permanently */

1480

error_t lower_privileges_permanently(void){

1481

error_t old_errno = errno;

1482

error_t ret_errno = 0;

1483

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

1484

ret_errno = errno;

1485

perror_plus("setuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

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

1725

__attribute__((nonnull))

1726

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

1492

1727

const float delay){

1493

struct dirent **direntries;

1494

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

1495

alphasort);

1728

struct dirent **direntries = NULL;

1729

if(hookdir_fd == -1){

1730

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1731

| O_CLOEXEC);

1732

if(hookdir_fd == -1){

1733

if(errno == ENOENT){

1734

if(debug){

1735

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

1736

" found\n", hookdir);

1737

}

1738

} else {

1739

perror_plus("open");

1740

}

1741

return;

1742

}

1743

}

1744

#ifdef __GLIBC__

1745

#if __GLIBC_PREREQ(2, 15)

1746

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

1747

runnable_hook, alphasort);

1748

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

1749

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

1750

alphasort);

1751

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

1752

#else /* not __GLIBC__ */

1753

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

1754

alphasort);

1755

#endif /* not __GLIBC__ */

1496

1756

if(numhooks == -1){

1497

if(errno == ENOENT){

1498

if(debug){

1499

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

1500

" found\n", hookdir);

1501

}

1502

} else {

1503

perror_plus("scandir");

1757

perror_plus("scandir");

1758

return;

1759

}

1760

struct dirent *direntry;

1761

int ret;

1762

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

1763

if(devnull == -1){

1764

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

1765

return;

1766

}

1767

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

1768

direntry = direntries[i];

1769

if(debug){

1770

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

1771

direntry->d_name);

1504

1772

}

1505

} else {

1506

struct dirent *direntry;

1507

int ret;

1508

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

1509

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

1510

direntry = direntries[i];

1511

char *fullname = NULL;

1512

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

1513

if(ret < 0){

1773

pid_t hook_pid = fork();

1774

if(hook_pid == 0){

1775

/* Child */

1776

/* Raise privileges */

1777

errno = raise_privileges_permanently();

1778

if(errno != 0){

1779

perror_plus("Failed to raise privileges");

1780

_exit(EX_NOPERM);

1781

}

1782

/* Set group */

1783

errno = 0;

1784

ret = setgid(0);

1785

if(ret == -1){

1786

perror_plus("setgid");

1787

_exit(EX_NOPERM);

1788

}

1789

/* Reset supplementary groups */

1790

errno = 0;

1791

ret = setgroups(0, NULL);

1792

if(ret == -1){

1793

perror_plus("setgroups");

1794

_exit(EX_NOPERM);

1795

}

1796

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

1797

if(ret == -1){

1798

perror_plus("setenv");

1799

_exit(EX_OSERR);

1800

}

1801

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

1802

if(ret == -1){

1803

perror_plus("setenv");

1804

_exit(EX_OSERR);

1805

}

1806

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

1807

if(ret == -1){

1808

perror_plus("setenv");

1809

_exit(EX_OSERR);

1810

}

1811

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

1812

if(ret == -1){

1813

perror_plus("setenv");

1814

_exit(EX_OSERR);

1815

}

1816

char *delaystring;

1817

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

1818

if(ret == -1){

1514

1819

perror_plus("asprintf");

1515

continue;

1516

}

1517

if(debug){

1518

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

1519

direntry->d_name);

1520

}

1521

pid_t hook_pid = fork();

1522

if(hook_pid == 0){

1523

/* Child */

1524

/* Raise privileges */

1525

raise_privileges_permanently();

1526

/* Set group */

1527

errno = 0;

1528

ret = setgid(0);

1529

if(ret == -1){

1530

perror_plus("setgid");

1531

}

1532

/* Reset supplementary groups */

1533

errno = 0;

1534

ret = setgroups(0, NULL);

1535

if(ret == -1){

1536

perror_plus("setgroups");

1537

}

1538

dup2(devnull, STDIN_FILENO);

1539

close(devnull);

1540

dup2(STDERR_FILENO, STDOUT_FILENO);

1541

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

1542

if(ret == -1){

1543

perror_plus("setenv");

1544

_exit(EX_OSERR);

1545

}

1546

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

1547

if(ret == -1){

1548

perror_plus("setenv");

1549

_exit(EX_OSERR);

1550

}

1551

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

1552

if(ret == -1){

1553

perror_plus("setenv");

1554

_exit(EX_OSERR);

1555

}

1556

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

1557

if(ret == -1){

1558

perror_plus("setenv");

1559

_exit(EX_OSERR);

1560

}

1561

char *delaystring;

1562

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

1563

if(ret == -1){

1564

perror_plus("asprintf");

1565

_exit(EX_OSERR);

1566

}

1567

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

1568

if(ret == -1){

1569

free(delaystring);

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1820

_exit(EX_OSERR);

1821

}

1822

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

1823

if(ret == -1){

1573

1824

free(delaystring);

1574

if(connect_to != NULL){

1575

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

1576

if(ret == -1){

1577

perror_plus("setenv");

1578

_exit(EX_OSERR);

1579

}

1580

}

1581

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

1582

perror_plus("execl");

1583

_exit(EXIT_FAILURE);

1584

}

1825

perror_plus("setenv");

1826

_exit(EX_OSERR);

1827

}

1828

free(delaystring);

1829

if(connect_to != NULL){

1830

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

1831

if(ret == -1){

1832

perror_plus("setenv");

1833

_exit(EX_OSERR);

1834

}

1835

}

1836

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

1837

direntry->d_name,

1838

O_RDONLY));

1839

if(hook_fd == -1){

1840

perror_plus("openat");

1841

_exit(EXIT_FAILURE);

1842

}

1843

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

1844

perror_plus("close");

1845

_exit(EXIT_FAILURE);

1846

}

1847

ret = dup2(devnull, STDIN_FILENO);

1848

if(ret == -1){

1849

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

1850

_exit(EX_OSERR);

1851

}

1852

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

1853

if(ret == -1){

1854

perror_plus("close");

1855

_exit(EX_OSERR);

1856

}

1857

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1858

if(ret == -1){

1859

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

1860

_exit(EX_OSERR);

1861

}

1862

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

1863

environ) == -1){

1864

perror_plus("fexecve");

1865

_exit(EXIT_FAILURE);

1866

}

1867

} else {

1868

if(hook_pid == -1){

1869

perror_plus("fork");

1870

free(direntry);

1871

continue;

1872

}

1873

int status;

1874

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

1875

perror_plus("waitpid");

1876

free(direntry);

1877

continue;

1878

}

1879

if(WIFEXITED(status)){

1880

if(WEXITSTATUS(status) != 0){

1881

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

1882

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

1883

WEXITSTATUS(status));

1884

free(direntry);

1885

continue;

1886

}

1887

} else if(WIFSIGNALED(status)){

1888

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

1889

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

1890

WTERMSIG(status));

1891

free(direntry);

1892

continue;

1585

1893

} else {

1586

int status;

1587

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

1588

perror_plus("waitpid");

1589

free(fullname);

1590

continue;

1591

}

1592

if(WIFEXITED(status)){

1593

if(WEXITSTATUS(status) != 0){

1594

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

1595

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

1596

WEXITSTATUS(status));

1597

free(fullname);

1598

continue;

1599

}

1600

} else if(WIFSIGNALED(status)){

1601

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

1602

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

1603

WTERMSIG(status));

1604

free(fullname);

1605

continue;

1606

} else {

1607

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

1608

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

1609

free(fullname);

1610

continue;

1611

}

1612

}

1613

free(fullname);

1614

if(debug){

1615

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

1616

direntry->d_name);

1617

}

1618

}

1619

close(devnull);

1620

}

1621

return true;

1894

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

1895

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

1896

free(direntry);

1897

continue;

1898

}

1899

}

1900

if(debug){

1901

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

1902

direntry->d_name);

1903

}

1904

free(direntry);

1905

}

1906

free(direntries);

1907

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

1908

perror_plus("close");

1909

} else {

1910

hookdir_fd = -1;

1911

}

1912

close(devnull);

1622

1913

}

1623

1914

1915

__attribute__((nonnull, warn_unused_result))

1624

1916

error_t bring_up_interface(const char *const interface,

1625

1917

const float delay){

1626

int sd = -1;

1627

1918

error_t old_errno = errno;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1919

int ret;

1630

1920

struct ifreq network;

1631

1921

unsigned int if_index = if_nametoindex(interface);

1632

1922

if(if_index == 0){

1641

1931

}

1642

1932

1643

1933

if(not interface_is_up(interface)){

1644

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

1934

error_t ret_errno = 0, ioctl_errno = 0;

1935

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

1645

1936

ret_errno = errno;

1646

1937

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

1647

1938

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

1939

errno = old_errno;

1648

1940

return ret_errno;

1649

1941

}

1650

network.ifr_flags |= IFF_UP;

1942

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

1651

1943

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1944

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

1945

if(sd == -1){

1654

1946

ret_errno = errno;

1655

1947

perror_plus("socket");

1656

1948

errno = old_errno;

1657

1949

return ret_errno;

1658

1950

}

1659

1951

1660

1952

if(quit_now){

1661

close(sd);

1953

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

1954

if(ret == -1){

1955

perror_plus("close");

1956

}

1662

1957

errno = old_errno;

1663

1958

return EINTR;

1664

1959

}

1668

1963

interface);

1669

1964

}

1670

1965

1671

/* Raise priviliges */

1672

raise_privileges();

1966

/* Raise privileges */

1967

ret_errno = raise_privileges();

1968

if(ret_errno != 0){

1969

errno = ret_errno;

1970

perror_plus("Failed to raise privileges");

1971

}

1673

1972

1674

1973

#ifdef __linux__

1675

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1676

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

1677

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

1678

bool restore_loglevel = true;

1679

if(ret_linux == -1){

1680

restore_loglevel = false;

1681

perror_plus("klogctl");

1974

int ret_linux;

1975

bool restore_loglevel = false;

1976

if(ret_errno == 0){

1977

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1978

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

1979

ret_linux = klogctl(8, NULL, 5);

1980

if(ret_linux == -1){

1981

perror_plus("klogctl");

1982

} else {

1983

restore_loglevel = true;

1984

}

1682

1985

}

1683

1986

#endif /* __linux__ */

1684

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

1685

ret_errno = errno;

1987

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

1988

ioctl_errno = errno;

1686

1989

#ifdef __linux__

1687

1990

if(restore_loglevel){

1688

1991

ret_linux = klogctl(7, NULL, 0);

1692

1995

}

1693

1996

#endif /* __linux__ */

1694

1997

1695

/* Lower privileges */

1696

lower_privileges();

1998

/* If raise_privileges() succeeded above */

1999

if(ret_errno == 0){

2000

/* Lower privileges */

2001

ret_errno = lower_privileges();

2002

if(ret_errno != 0){

2003

errno = ret_errno;

2004

perror_plus("Failed to lower privileges");

2005

}

2006

}

1697

2007

1698

2008

/* Close the socket */

1699

2009

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

1702

2012

}

1703

2013

1704

2014

if(ret_setflags == -1){

1705

errno = ret_errno;

2015

errno = ioctl_errno;

1706

2016

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1707

2017

errno = old_errno;

1708

return ret_errno;

2018

return ioctl_errno;

1709

2019

}

1710

2020

} else if(debug){

1711

2021

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

1729

2039

return 0;

1730

2040

}

1731

2041

2042

__attribute__((nonnull, warn_unused_result))

1732

2043

error_t take_down_interface(const char *const interface){

1733

2044

error_t old_errno = errno;

1734

2045

struct ifreq network;

1739

2050

return ENXIO;

1740

2051

}

1741

2052

if(interface_is_up(interface)){

1742

error_t ret_errno = 0;

2053

error_t ret_errno = 0, ioctl_errno = 0;

1743

2054

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

1744

2055

ret_errno = errno;

1745

2056

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

1746

2057

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

2058

errno = old_errno;

1747

2059

return ret_errno;

1748

2060

}

1749

2061

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

1750

2062

1751

2063

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

1752

if(sd < 0){

2064

if(sd == -1){

1753

2065

ret_errno = errno;

1754

2066

perror_plus("socket");

1755

2067

errno = old_errno;

1761

2073

interface);

1762

2074

}

1763

2075

1764

/* Raise priviliges */

1765

raise_privileges();

2076

/* Raise privileges */

2077

ret_errno = raise_privileges();

2078

if(ret_errno != 0){

2079

errno = ret_errno;

2080

perror_plus("Failed to raise privileges");

2081

}

1766

2082

1767

2083

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

1768

ret_errno = errno;

2084

ioctl_errno = errno;

1769

2085

1770

/* Lower privileges */

1771

lower_privileges();

2086

/* If raise_privileges() succeeded above */

2087

if(ret_errno == 0){

2088

/* Lower privileges */

2089

ret_errno = lower_privileges();

2090

if(ret_errno != 0){

2091

errno = ret_errno;

2092

perror_plus("Failed to lower privileges");

2093

}

2094

}

1772

2095

1773

2096

/* Close the socket */

1774

2097

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

1777

2100

}

1778

2101

1779

2102

if(ret_setflags == -1){

1780

errno = ret_errno;

2103

errno = ioctl_errno;

1781

2104

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1782

2105

errno = old_errno;

1783

return ret_errno;

2106

return ioctl_errno;

1784

2107

}

1785

2108

} else if(debug){

1786

2109

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

1794

2117

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

1795

2118

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

1796

2119

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

1797

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

2120

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

1798

2121

.interfaces = NULL, .interfaces_size = 0 };

1799

2122

AvahiSServiceBrowser *sb = NULL;

1800

2123

error_t ret_errno;

1804

2127

int exitcode = EXIT_SUCCESS;

1805

2128

char *interfaces_to_take_down = NULL;

1806

2129

size_t interfaces_to_take_down_size = 0;

1807

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

1808

bool tempdir_created = false;

2130

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

2131

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

2132

char *tempdir = NULL;

1809

2133

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1810

2134

const char *seckey = PATHDIR "/" SECKEY;

1811

2135

const char *pubkey = PATHDIR "/" PUBKEY;

1988

2312

goto end;

1989

2313

}

1990

2314

}

1991

2315

1992

2316

{

1993

2317

/* Work around Debian bug #633582:

1994

2318

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

1995

2319

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2320

/* Re-raise privileges */

2321

ret_errno = raise_privileges();

2322

if(ret_errno != 0){

2323

errno = ret_errno;

2324

perror_plus("Failed to raise privileges");

2325

} else {

1998

2326

struct stat st;

1999

2327

2000

2328

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

2017

2345

TEMP_FAILURE_RETRY(close(seckey_fd));

2018

2346

}

2019

2347

}

2020

2348

2021

2349

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

2022

2350

int pubkey_fd = open(pubkey, O_RDONLY);

2023

2351

if(pubkey_fd == -1){

2038

2366

TEMP_FAILURE_RETRY(close(pubkey_fd));

2039

2367

}

2040

2368

}

2041

2369

2042

2370

/* Lower privileges */

2043

lower_privileges();

2371

ret_errno = lower_privileges();

2372

if(ret_errno != 0){

2373

errno = ret_errno;

2374

perror_plus("Failed to lower privileges");

2375

}

2044

2376

}

2045

2377

}

2046

2378

2072

2404

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

2073

2405

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

2074

2406

}

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2407

run_network_hooks("start", interfaces_hooks != NULL ?

2408

interfaces_hooks : "", delay);

2079

2409

}

2080

2410

2081

2411

if(not debug){

2159

2489

2160

2490

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

2161

2491

if(mc.interfaces == NULL){

2162

struct dirent **direntries;

2492

struct dirent **direntries = NULL;

2163

2493

/* Look for any good interfaces */

2164

2494

ret = scandir(sys_class_net, &direntries, good_interface,

2165

2495

alphasort);

2171

2501

if(ret_errno != 0){

2172

2502

errno = ret_errno;

2173

2503

perror_plus("argz_add");

2504

free(direntries[i]);

2174

2505

continue;

2175

2506

}

2176

2507

if(debug){

2177

2508

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

2178

2509

direntries[i]->d_name);

2179

2510

}

2511

free(direntries[i]);

2180

2512

}

2181

2513

free(direntries);

2182

2514

} else {

2183

free(direntries);

2515

if(ret == 0){

2516

free(direntries);

2517

}

2184

2518

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

2185

2519

exitcode = EXIT_FAILURE;

2186

2520

goto end;

2209

2543

break;

2210

2544

}

2211

2545

bool interface_was_up = interface_is_up(interface);

2212

ret = bring_up_interface(interface, delay);

2546

errno = bring_up_interface(interface, delay);

2213

2547

if(not interface_was_up){

2214

if(ret != 0){

2215

errno = ret;

2548

if(errno != 0){

2216

2549

perror_plus("Failed to bring up interface");

2217

2550

} else {

2218

ret_errno = argz_add(&interfaces_to_take_down,

2219

&interfaces_to_take_down_size,

2220

interface);

2221

if(ret_errno != 0){

2222

errno = ret_errno;

2551

errno = argz_add(&interfaces_to_take_down,

2552

&interfaces_to_take_down_size,

2553

interface);

2554

if(errno != 0){

2223

2555

perror_plus("argz_add");

2224

2556

}

2225

2557

}

2256

2588

goto end;

2257

2589

}

2258

2590

2259

if(mkdtemp(tempdir) == NULL){

2591

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

2592

tempdir = mkdtemp(run_tempdir);

2593

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

2594

if(debug){

2595

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

2596

run_tempdir, old_tempdir);

2597

}

2598

tempdir = mkdtemp(old_tempdir);

2599

}

2600

if(tempdir == NULL){

2260

2601

perror_plus("mkdtemp");

2261

2602

goto end;

2262

2603

}

2263

tempdir_created = true;

2264

2604

2265

2605

if(quit_now){

2266

2606

goto end;

2341

2681

sleep((unsigned int)retry_interval);

2342

2682

}

2343

2683

2344

if (not quit_now){

2684

if(not quit_now){

2345

2685

exitcode = EXIT_SUCCESS;

2346

2686

}

2347

2687

2402

2742

if(debug){

2403

2743

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

2404

2744

}

2405

2745

2406

2746

ret = avahi_loop_with_timeout(simple_poll,

2407

2747

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

2408

2748

if(debug){

2444

2784

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

2445

2785

while(mc.current_server != NULL){

2446

2786

server *next = mc.current_server->next;

2787

#ifdef __GNUC__

2788

#pragma GCC diagnostic push

2789

#pragma GCC diagnostic ignored "-Wcast-qual"

2790

#endif

2791

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

2792

#ifdef __GNUC__

2793

#pragma GCC diagnostic pop

2794

#endif

2447

2795

free(mc.current_server);

2448

2796

mc.current_server = next;

2449

2797

}

2450

2798

}

2451

2799

2452

/* Re-raise priviliges */

2800

/* Re-raise privileges */

2453

2801

{

2454

raise_privileges();

2455

2456

/* Run network hooks */

2457

run_network_hooks("stop", interfaces_hooks != NULL ?

2458

interfaces_hooks : "", delay);

2459

2460

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

2461

{

2462

char *interface = NULL;

2463

while((interface=argz_next(interfaces_to_take_down,

2464

interfaces_to_take_down_size,

2465

interface))){

2466

ret_errno = take_down_interface(interface);

2467

if(ret_errno != 0){

2468

errno = ret_errno;

2469

perror_plus("Failed to take down interface");

2470

}

2471

}

2472

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

2473

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

2474

" down\n");

2475

}

2476

}

2477

2478

lower_privileges_permanently();

2802

ret_errno = raise_privileges();

2803

if(ret_errno != 0){

2804

errno = ret_errno;

2805

perror_plus("Failed to raise privileges");

2806

} else {

2807

2808

/* Run network hooks */

2809

run_network_hooks("stop", interfaces_hooks != NULL ?

2810

interfaces_hooks : "", delay);

2811

2812

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

2813

{

2814

char *interface = NULL;

2815

while((interface=argz_next(interfaces_to_take_down,

2816

interfaces_to_take_down_size,

2817

interface))){

2818

ret_errno = take_down_interface(interface);

2819

if(ret_errno != 0){

2820

errno = ret_errno;

2821

perror_plus("Failed to take down interface");

2822

}

2823

}

2824

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

2825

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

2826

" down\n");

2827

}

2828

}

2829

}

2830

2831

ret_errno = lower_privileges_permanently();

2832

if(ret_errno != 0){

2833

errno = ret_errno;

2834

perror_plus("Failed to lower privileges permanently");

2835

}

2479

2836

}

2480

2837

2481

2838

free(interfaces_to_take_down);

2482

2839

free(interfaces_hooks);

2483

2840

2484

2841

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

2485

if(tempdir_created){

2842

if(tempdir != NULL){

2486

2843

struct dirent **direntries = NULL;

2487

struct dirent *direntry = NULL;

2488

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

2489

alphasort);

2490

if (numentries > 0){

2491

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

2492

direntry = direntries[i];

2493

char *fullname = NULL;

2494

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

2495

direntry->d_name);

2496

if(ret < 0){

2497

perror_plus("asprintf");

2498

continue;

2499

}

2500

ret = remove(fullname);

2501

if(ret == -1){

2502

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

2503

strerror(errno));

2504

}

2505

free(fullname);

2844

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

2845

| O_NOFOLLOW

2846

| O_DIRECTORY

2847

| O_PATH));

2848

if(tempdir_fd == -1){

2849

perror_plus("open");

2850

} else {

2851

#ifdef __GLIBC__

2852

#if __GLIBC_PREREQ(2, 15)

2853

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

2854

notdotentries, alphasort);

2855

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

2856

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

2857

alphasort);

2858

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

2859

#else /* not __GLIBC__ */

2860

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

2861

alphasort);

2862

#endif /* not __GLIBC__ */

2863

if(numentries >= 0){

2864

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

2865

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

2866

if(ret == -1){

2867

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

2868

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

2869

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

2870

}

2871

free(direntries[i]);

2872

}

2873

2874

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

2875

free(direntries);

2876

if(numentries == -1){

2877

perror_plus("scandir");

2878

}

2879

ret = rmdir(tempdir);

2880

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

2881

perror_plus("rmdir");

2882

}

2506

2883

}

2507

}

2508

2509

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

2510

free(direntries);

2511

if (numentries == -1){

2512

perror_plus("scandir");

2513

}

2514

ret = rmdir(tempdir);

2515

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

2516

perror_plus("rmdir");

2884

TEMP_FAILURE_RETRY(close(tempdir_fd));

2517

2885

}

2518

2886

}

2519

2887