/mandos/trunk : revision 757

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(),

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

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

58

inet_pton(), connect() */

59

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

61

62

*/

62

63

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

72

73

*/

73

74

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

74

75

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

75

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

76

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

76

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

77

unlinkat() */

78

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

77

79

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

78

80

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

79

81

argp_state, struct argp,

91

93

argz_delete(), argz_append(),

92

94

argz_stringify(), argz_add(),

93

95

argz_count() */

96

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

97

EAI_SYSTEM, gai_strerror() */

94

98

95

99

#ifdef __linux__

96

100

#include <sys/klog.h> /* klogctl() */

138

142

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

139

143

char *connect_to = NULL;

140

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

141

146

uid_t uid = 65534;

142

147

gid_t gid = 65534;

143

148

180

185

perror(print_text);

181

186

}

182

187

183

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

188

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

184

189

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

185

190

va_list ap;

186

191

va_start (ap, format);

195

200

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

196

201

* "buffer_length" is how much is already used.

197

202

*/

203

__attribute__((nonnull, warn_unused_result))

198

204

size_t incbuffer(char **buffer, size_t buffer_length,

199

205

size_t buffer_capacity){

200

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

202

if(buffer == NULL){

207

char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

203

213

return 0;

204

214

}

215

*buffer = new_buf;

205

216

buffer_capacity += BUFFER_SIZE;

206

217

}

207

218

return buffer_capacity;

208

219

}

209

220

210

221

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

222

__attribute__((nonnull, warn_unused_result))

211

223

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

212

224

int af, server **current_server){

213

225

int ret;

222

234

.af = af };

223

235

if(new_server->ip == NULL){

224

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

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);

225

252

return false;

226

253

}

227

254

/* Special case of first server */

229

256

new_server->next = new_server;

230

257

new_server->prev = new_server;

231

258

*current_server = new_server;

232

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

233

259

} else {

260

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

234

261

new_server->next = *current_server;

235

262

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

236

263

new_server->prev->next = new_server;

237

264

(*current_server)->prev = new_server;

238

265

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

266

return true;

245

267

}

246

268

247

269

/*

248

270

* Initialize GPGME.

249

271

*/

250

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

251

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){

252

277

gpgme_error_t rc;

253

278

gpgme_engine_info_t engine_info;

254

279

255

280

/*

256

281

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

257

282

*/

258

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

259

284

int ret;

260

285

int fd;

261

286

gpgme_data_t pgp_data;

342

367

* Decrypt OpenPGP data.

343

368

* Returns -1 on error

344

369

*/

370

__attribute__((nonnull, warn_unused_result))

345

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

372

size_t crypto_size,

347

373

char **plaintext,

467

493

return plaintext_length;

468

494

}

469

495

470

static const char * safer_gnutls_strerror(int value){

496

__attribute__((warn_unused_result, const))

497

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

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

471

505

const char *ret = gnutls_strerror(value);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

506

return safe_string(ret);

475

507

}

476

508

477

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

478

511

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

479

512

const char* string){

480

513

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

481

514

}

482

515

516

__attribute__((nonnull, warn_unused_result))

483

517

static int init_gnutls_global(const char *pubkeyfilename,

484

518

const char *seckeyfilename,

485

519

mandos_context *mc){

486

520

int ret;

521

unsigned int uret;

487

522

488

523

if(debug){

489

524

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

540

575

safer_gnutls_strerror(ret));

541

576

goto globalfail;

542

577

}

578

if(mc->dh_bits == 0){

579

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

580

/* Try to read the private key file */

581

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

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

585

while(true){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

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

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

627

if(ret != GNUTLS_E_SUCCESS){

628

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

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

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

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

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

663

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

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

668

} else {

669

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

670

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

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

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

677

mc->dh_bits);

678

}

543

679

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

544

680

if(ret != GNUTLS_E_SUCCESS){

545

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

546

safer_gnutls_strerror(ret));

681

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

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

547

683

goto globalfail;

548

684

}

549

685

559

695

return -1;

560

696

}

561

697

698

__attribute__((nonnull, warn_unused_result))

562

699

static int init_gnutls_session(gnutls_session_t *session,

563

700

mandos_context *mc){

564

701

int ret;

621

758

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

622

759

623

760

/* Called when a Mandos server is found */

761

__attribute__((nonnull, warn_unused_result))

624

762

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

625

763

AvahiIfIndex if_index,

626

764

int af, mandos_context *mc){

627

765

int ret, tcp_sd = -1;

628

766

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

767

struct sockaddr_storage to;

633

768

char *buffer = NULL;

634

769

char *decrypted_buffer = NULL;

635

770

size_t buffer_length = 0;

716

851

717

852

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

718

853

if(af == AF_INET6){

719

to.in6.sin6_family = (sa_family_t)af;

720

ret = inet_pton(af, ip, &to.in6.sin6_addr);

854

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

855

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

721

856

} else { /* IPv4 */

722

to.in.sin_family = (sa_family_t)af;

723

ret = inet_pton(af, ip, &to.in.sin_addr);

857

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

858

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

724

859

}

725

860

if(ret < 0 ){

726

861

int e = errno;

735

870

goto mandos_end;

736

871

}

737

872

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

741

-Wunreachable-code*/

873

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

874

if(IN6_IS_ADDR_LINKLOCAL

875

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

742

876

if(if_index == AVAHI_IF_UNSPEC){

743

877

fprintf_plus(stderr, "An IPv6 link-local address is"

744

878

" incomplete without a network interface\n");

746

880

goto mandos_end;

747

881

}

748

882

/* Set the network interface number as scope */

749

to.in6.sin6_scope_id = (uint32_t)if_index;

883

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

750

884

}

751

885

} else {

752

to.in.sin_port = htons(port); /* Spurious warnings from

753

-Wconversion and

754

-Wunreachable-code */

886

((struct sockaddr_in *)&to)->sin_port = htons(port);

755

887

}

756

888

757

889

if(quit_now){

774

906

}

775

907

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

908

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

777

const char *pcret;

778

909

if(af == AF_INET6){

779

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

780

sizeof(addrstr));

910

ret = getnameinfo((struct sockaddr *)&to,

911

sizeof(struct sockaddr_in6),

912

addrstr, sizeof(addrstr), NULL, 0,

913

NI_NUMERICHOST);

781

914

} else {

782

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

783

sizeof(addrstr));

915

ret = getnameinfo((struct sockaddr *)&to,

916

sizeof(struct sockaddr_in),

917

addrstr, sizeof(addrstr), NULL, 0,

918

NI_NUMERICHOST);

784

919

}

785

if(pcret == NULL){

786

perror_plus("inet_ntop");

787

} else {

788

if(strcmp(addrstr, ip) != 0){

789

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

790

}

920

if(ret == EAI_SYSTEM){

921

perror_plus("getnameinfo");

922

} else if(ret != 0) {

923

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

924

} else if(strcmp(addrstr, ip) != 0){

925

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

791

926

}

792

927

}

793

928

797

932

}

798

933

799

934

if(af == AF_INET6){

800

ret = connect(tcp_sd, &to.in6, sizeof(to));

935

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

936

sizeof(struct sockaddr_in6));

801

937

} else {

802

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

938

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

939

sizeof(struct sockaddr_in));

803

940

}

804

941

if(ret < 0){

805

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

942

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

806

943

int e = errno;

807

944

perror_plus("connect");

808

945

errno = e;

1023

1160

return retval;

1024

1161

}

1025

1162

1163

__attribute__((nonnull))

1026

1164

static void resolve_callback(AvahiSServiceResolver *r,

1027

1165

AvahiIfIndex interface,

1028

1166

AvahiProtocol proto,

1036

1174

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

1175

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

1176

flags,

1039

void* mc){

1177

void *mc){

1040

1178

if(r == NULL){

1041

1179

return;

1042

1180

}

1045

1183

timed out */

1046

1184

1047

1185

if(quit_now){

1186

avahi_s_service_resolver_free(r);

1048

1187

return;

1049

1188

}

1050

1189

1095

1234

const char *domain,

1096

1235

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1236

flags,

1098

void* mc){

1237

void *mc){

1099

1238

if(b == NULL){

1100

1239

return;

1101

1240

}

1161

1300

errno = old_errno;

1162

1301

}

1163

1302

1303

__attribute__((nonnull, warn_unused_result))

1164

1304

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

1165

1305

int ret;

1166

1306

error_t ret_errno;

1185

1325

return true;

1186

1326

}

1187

1327

1328

__attribute__((nonnull, warn_unused_result))

1188

1329

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

1189

1330

1190

1331

/* Reject the loopback device */

1232

1373

* corresponds to an acceptable network device.

1233

1374

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

1234

1375

*/

1376

__attribute__((nonnull, warn_unused_result))

1235

1377

int good_interface(const struct dirent *if_entry){

1236

1378

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

1237

1379

return 0;

1255

1397

/*

1256

1398

* This function determines if a network interface is up.

1257

1399

*/

1400

__attribute__((nonnull, warn_unused_result))

1258

1401

bool interface_is_up(const char *interface){

1259

1402

struct ifreq ifr;

1260

1403

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

1271

1414

/*

1272

1415

* This function determines if a network interface is running

1273

1416

*/

1417

__attribute__((nonnull, warn_unused_result))

1274

1418

bool interface_is_running(const char *interface){

1275

1419

struct ifreq ifr;

1276

1420

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

1284

1428

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

1285

1429

}

1286

1430

1431

__attribute__((nonnull, pure, warn_unused_result))

1287

1432

int notdotentries(const struct dirent *direntry){

1288

1433

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

1289

1434

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

1296

1441

}

1297

1442

1298

1443

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

1444

__attribute__((nonnull, warn_unused_result))

1299

1445

int runnable_hook(const struct dirent *direntry){

1300

1446

int ret;

1301

1447

size_t sret;

1309

1455

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

1310

1456

"abcdefghijklmnopqrstuvwxyz"

1311

1457

"0123456789"

1312

"_-");

1458

"_.-");

1313

1459

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

1314

1460

/* Contains non-allowed characters */

1315

1461

if(debug){

1319

1465

return 0;

1320

1466

}

1321

1467

1322

char *fullname = NULL;

1323

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

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

1468

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

1330

1469

if(ret == -1){

1331

1470

if(debug){

1332

1471

perror_plus("Could not stat hook");

1356

1495

return 1;

1357

1496

}

1358

1497

1498

__attribute__((nonnull, warn_unused_result))

1359

1499

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

1500

mandos_context *mc){

1361

1501

int ret;

1365

1505

1366

1506

while(true){

1367

1507

if(mc->current_server == NULL){

1368

if (debug){

1508

if(debug){

1369

1509

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

1370

1510

" No timeout!\n");

1371

1511

}

1372

1512

ret = avahi_simple_poll_iterate(s, -1);

1373

1513

} else {

1374

if (debug){

1514

if(debug){

1375

1515

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

1376

1516

" it, or wait\n");

1377

1517

}

1394

1534

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

1395

1535

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

1396

1536

1397

if (debug){

1537

if(debug){

1398

1538

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

1399

1539

block_time);

1400

1540

}

1422

1562

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

1423

1563

}

1424

1564

if(ret != 0){

1425

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

1565

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

1426

1566

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

1427

1567

}

1428

1568

}

1430

1570

}

1431

1571

1432

1572

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

1573

__attribute__((warn_unused_result))

1433

1574

error_t raise_privileges(void){

1434

1575

error_t old_errno = errno;

1435

1576

error_t ret_errno = 0;

1436

1577

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

1437

1578

ret_errno = errno;

1438

perror_plus("seteuid");

1439

1579

}

1440

1580

errno = old_errno;

1441

1581

return ret_errno;

1442

1582

}

1443

1583

1444

1584

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

1585

__attribute__((warn_unused_result))

1445

1586

error_t raise_privileges_permanently(void){

1446

1587

error_t old_errno = errno;

1447

1588

error_t ret_errno = raise_privileges();

1451

1592

}

1452

1593

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

1453

1594

ret_errno = errno;

1454

perror_plus("seteuid");

1455

1595

}

1456

1596

errno = old_errno;

1457

1597

return ret_errno;

1458

1598

}

1459

1599

1460

1600

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

1601

__attribute__((warn_unused_result))

1461

1602

error_t lower_privileges(void){

1462

1603

error_t old_errno = errno;

1463

1604

error_t ret_errno = 0;

1464

1605

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

1465

1606

ret_errno = errno;

1466

perror_plus("seteuid");

1467

1607

}

1468

1608

errno = old_errno;

1469

1609

return ret_errno;

1470

1610

}

1471

1611

1472

1612

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1473

1614

error_t lower_privileges_permanently(void){

1474

1615

error_t old_errno = errno;

1475

1616

error_t ret_errno = 0;

1476

1617

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

1477

1618

ret_errno = errno;

1478

perror_plus("setuid");

1479

1619

}

1480

1620

errno = old_errno;

1481

1621

return ret_errno;

1482

1622

}

1483

1623

1484

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

1624

__attribute__((nonnull))

1625

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

1485

1626

const float delay){

1486

struct dirent **direntries;

1627

struct dirent **direntries = NULL;

1628

if(hookdir_fd == -1){

1629

hookdir_fd = open(hookdir, O_RDONLY);

1630

if(hookdir_fd == -1){

1631

if(errno == ENOENT){

1632

if(debug){

1633

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

1634

" found\n", hookdir);

1635

}

1636

} else {

1637

perror_plus("open");

1638

}

1639

return;

1640

}

1641

}

1642

#ifdef __GLIBC__

1643

#if __GLIBC_PREREQ(2, 15)

1644

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

1645

runnable_hook, alphasort);

1646

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

1647

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

1648

alphasort);

1649

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

1650

#else /* not __GLIBC__ */

1651

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

1652

alphasort);

1653

#endif /* not __GLIBC__ */

1654

if(numhooks == -1){

1655

perror_plus("scandir");

1656

return;

1657

}

1487

1658

struct dirent *direntry;

1488

1659

int ret;

1489

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

1490

alphasort);

1491

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

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

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1660

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

1661

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

1662

direntry = direntries[i];

1663

if(debug){

1664

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

1665

direntry->d_name);

1499

1666

}

1500

} else {

1501

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

1502

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

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

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

1506

if(ret < 0){

1667

pid_t hook_pid = fork();

1668

if(hook_pid == 0){

1669

/* Child */

1670

/* Raise privileges */

1671

errno = raise_privileges_permanently();

1672

if(errno != 0){

1673

perror_plus("Failed to raise privileges");

1674

_exit(EX_NOPERM);

1675

}

1676

/* Set group */

1677

errno = 0;

1678

ret = setgid(0);

1679

if(ret == -1){

1680

perror_plus("setgid");

1681

_exit(EX_NOPERM);

1682

}

1683

/* Reset supplementary groups */

1684

errno = 0;

1685

ret = setgroups(0, NULL);

1686

if(ret == -1){

1687

perror_plus("setgroups");

1688

_exit(EX_NOPERM);

1689

}

1690

ret = dup2(devnull, STDIN_FILENO);

1691

if(ret == -1){

1692

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

1693

_exit(EX_OSERR);

1694

}

1695

ret = close(devnull);

1696

if(ret == -1){

1697

perror_plus("close");

1698

_exit(EX_OSERR);

1699

}

1700

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1701

if(ret == -1){

1702

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

1703

_exit(EX_OSERR);

1704

}

1705

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

1706

if(ret == -1){

1707

perror_plus("setenv");

1708

_exit(EX_OSERR);

1709

}

1710

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

1711

if(ret == -1){

1712

perror_plus("setenv");

1713

_exit(EX_OSERR);

1714

}

1715

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

1716

if(ret == -1){

1717

perror_plus("setenv");

1718

_exit(EX_OSERR);

1719

}

1720

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

1721

if(ret == -1){

1722

perror_plus("setenv");

1723

_exit(EX_OSERR);

1724

}

1725

char *delaystring;

1726

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

1727

if(ret == -1){

1507

1728

perror_plus("asprintf");

1508

continue;

1509

}

1510

if(debug){

1511

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

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

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

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

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

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

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

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

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

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

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

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

1729

_exit(EX_OSERR);

1730

}

1731

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

1732

if(ret == -1){

1566

1733

free(delaystring);

1567

if(connect_to != NULL){

1568

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

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

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

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

1734

perror_plus("setenv");

1735

_exit(EX_OSERR);

1736

}

1737

free(delaystring);

1738

if(connect_to != NULL){

1739

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

1740

if(ret == -1){

1741

perror_plus("setenv");

1742

_exit(EX_OSERR);

1743

}

1744

}

1745

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

1746

if(hook_fd == -1){

1747

perror_plus("openat");

1748

_exit(EXIT_FAILURE);

1749

}

1750

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

1751

perror_plus("close");

1752

_exit(EXIT_FAILURE);

1753

}

1754

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

1755

environ) == -1){

1756

perror_plus("fexecve");

1757

_exit(EXIT_FAILURE);

1758

}

1759

} else {

1760

if(hook_pid == -1){

1761

perror_plus("fork");

1762

free(direntry);

1763

continue;

1764

}

1765

int status;

1766

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

1767

perror_plus("waitpid");

1768

free(direntry);

1769

continue;

1770

}

1771

if(WIFEXITED(status)){

1772

if(WEXITSTATUS(status) != 0){

1773

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

1774

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

1775

WEXITSTATUS(status));

1776

free(direntry);

1777

continue;

1778

}

1779

} else if(WIFSIGNALED(status)){

1780

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

1781

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

1782

WTERMSIG(status));

1783

free(direntry);

1784

continue;

1578

1785

} else {

1579

int status;

1580

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

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

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

1588

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

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

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

1595

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

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

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

1601

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

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

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

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

1786

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

1787

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

1788

free(direntry);

1789

continue;

1790

}

1791

}

1792

if(debug){

1793

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

1794

direntry->d_name);

1795

}

1796

free(direntry);

1797

}

1798

free(direntries);

1799

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

1800

perror_plus("close");

1801

} else {

1802

hookdir_fd = -1;

1803

}

1804

close(devnull);

1615

1805

}

1616

1806

1807

__attribute__((nonnull, warn_unused_result))

1617

1808

error_t bring_up_interface(const char *const interface,

1618

1809

const float delay){

1619

int sd = -1;

1620

1810

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1811

int ret;

1623

1812

struct ifreq network;

1624

1813

unsigned int if_index = if_nametoindex(interface);

1625

1814

if(if_index == 0){

1634

1823

}

1635

1824

1636

1825

if(not interface_is_up(interface)){

1637

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

1826

error_t ret_errno = 0, ioctl_errno = 0;

1827

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

1638

1828

ret_errno = errno;

1639

1829

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

1640

1830

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

1831

errno = old_errno;

1641

1832

return ret_errno;

1642

1833

}

1643

network.ifr_flags |= IFF_UP;

1834

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

1644

1835

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1836

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

1837

if(sd == -1){

1647

1838

ret_errno = errno;

1648

1839

perror_plus("socket");

1649

1840

errno = old_errno;

1650

1841

return ret_errno;

1651

1842

}

1652

1843

1653

1844

if(quit_now){

1654

close(sd);

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1655

1849

errno = old_errno;

1656

1850

return EINTR;

1657

1851

}

1661

1855

interface);

1662

1856

}

1663

1857

1664

/* Raise priviliges */

1665

raise_privileges();

1858

/* Raise privileges */

1859

ret_errno = raise_privileges();

1860

if(ret_errno != 0){

1861

errno = ret_errno;

1862

perror_plus("Failed to raise privileges");

1863

}

1666

1864

1667

1865

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

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

1670

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

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1866

int ret_linux;

1867

bool restore_loglevel = false;

1868

if(ret_errno == 0){

1869

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1870

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

1871

ret_linux = klogctl(8, NULL, 5);

1872

if(ret_linux == -1){

1873

perror_plus("klogctl");

1874

} else {

1875

restore_loglevel = true;

1876

}

1675

1877

}

1676

1878

#endif /* __linux__ */

1677

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

1678

ret_errno = errno;

1879

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

1880

ioctl_errno = errno;

1679

1881

#ifdef __linux__

1680

1882

if(restore_loglevel){

1681

1883

ret_linux = klogctl(7, NULL, 0);

1685

1887

}

1686

1888

#endif /* __linux__ */

1687

1889

1688

/* Lower privileges */

1689

lower_privileges();

1890

/* If raise_privileges() succeeded above */

1891

if(ret_errno == 0){

1892

/* Lower privileges */

1893

ret_errno = lower_privileges();

1894

if(ret_errno != 0){

1895

errno = ret_errno;

1896

perror_plus("Failed to lower privileges");

1897

}

1898

}

1690

1899

1691

1900

/* Close the socket */

1692

1901

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

1695

1904

}

1696

1905

1697

1906

if(ret_setflags == -1){

1698

errno = ret_errno;

1907

errno = ioctl_errno;

1699

1908

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

1909

errno = old_errno;

1701

return ret_errno;

1910

return ioctl_errno;

1702

1911

}

1703

1912

} else if(debug){

1704

1913

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

1722

1931

return 0;

1723

1932

}

1724

1933

1934

__attribute__((nonnull, warn_unused_result))

1725

1935

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

1936

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

1937

struct ifreq network;

1731

1938

unsigned int if_index = if_nametoindex(interface);

1732

1939

if(if_index == 0){

1735

1942

return ENXIO;

1736

1943

}

1737

1944

if(interface_is_up(interface)){

1945

error_t ret_errno = 0, ioctl_errno = 0;

1738

1946

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

1739

1947

ret_errno = errno;

1740

1948

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

1741

1949

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

1950

errno = old_errno;

1742

1951

return ret_errno;

1743

1952

}

1744

1953

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

1745

1954

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1955

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

1956

if(sd == -1){

1748

1957

ret_errno = errno;

1749

1958

perror_plus("socket");

1750

1959

errno = old_errno;

1756

1965

interface);

1757

1966

}

1758

1967

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

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

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1968

/* Raise privileges */

1969

ret_errno = raise_privileges();

1970

if(ret_errno != 0){

1971

errno = ret_errno;

1972

perror_plus("Failed to raise privileges");

1973

}

1974

1975

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

1976

ioctl_errno = errno;

1977

1978

/* If raise_privileges() succeeded above */

1979

if(ret_errno == 0){

1980

/* Lower privileges */

1981

ret_errno = lower_privileges();

1982

if(ret_errno != 0){

1983

errno = ret_errno;

1984

perror_plus("Failed to lower privileges");

1985

}

1986

}

1767

1987

1768

1988

/* Close the socket */

1769

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

1989

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

1770

1990

if(ret == -1){

1771

1991

perror_plus("close");

1772

1992

}

1773

1993

1774

1994

if(ret_setflags == -1){

1775

errno = ret_errno;

1995

errno = ioctl_errno;

1776

1996

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

1997

errno = old_errno;

1778

return ret_errno;

1998

return ioctl_errno;

1779

1999

}

1780

2000

} else if(debug){

1781

2001

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

1787

2007

}

1788

2008

1789

2009

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

1790

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

2010

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

1791

2011

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

1792

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

2012

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

1793

2013

.interfaces = NULL, .interfaces_size = 0 };

1794

2014

AvahiSServiceBrowser *sb = NULL;

1795

2015

error_t ret_errno;

1799

2019

int exitcode = EXIT_SUCCESS;

1800

2020

char *interfaces_to_take_down = NULL;

1801

2021

size_t interfaces_to_take_down_size = 0;

1802

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

1803

bool tempdir_created = false;

2022

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

2023

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

2024

char *tempdir = NULL;

1804

2025

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

2026

const char *seckey = PATHDIR "/" SECKEY;

1806

2027

const char *pubkey = PATHDIR "/" PUBKEY;

1807

2028

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

2029

1810

2030

bool gnutls_initialized = false;

1811

2031

bool gpgme_initialized = false;

1989

2209

/* Work around Debian bug #633582:

1990

2210

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

1991

2211

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2212

/* Re-raise privileges */

2213

ret_errno = raise_privileges();

2214

if(ret_errno != 0){

2215

errno = ret_errno;

2216

perror_plus("Failed to raise privileges");

2217

} else {

1994

2218

struct stat st;

1995

2219

1996

2220

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

2036

2260

}

2037

2261

2038

2262

/* Lower privileges */

2039

lower_privileges();

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2267

}

2040

2268

}

2041

2269

}

2042

2270

2066

2294

goto end;

2067

2295

}

2068

2296

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

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

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

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

2297

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

2298

}

2299

run_network_hooks("start", interfaces_hooks != NULL ?

2300

interfaces_hooks : "", delay);

2077

2301

}

2078

2302

2079

2303

if(not debug){

2157

2381

2158

2382

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

2159

2383

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2384

struct dirent **direntries = NULL;

2161

2385

/* Look for any good interfaces */

2162

2386

ret = scandir(sys_class_net, &direntries, good_interface,

2163

2387

alphasort);

2167

2391

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2168

2392

direntries[i]->d_name);

2169

2393

if(ret_errno != 0){

2394

errno = ret_errno;

2170

2395

perror_plus("argz_add");

2396

free(direntries[i]);

2171

2397

continue;

2172

2398

}

2173

2399

if(debug){

2174

2400

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

2175

2401

direntries[i]->d_name);

2176

2402

}

2403

free(direntries[i]);

2177

2404

}

2178

2405

free(direntries);

2179

2406

} else {

2180

free(direntries);

2407

if(ret == 0){

2408

free(direntries);

2409

}

2181

2410

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

2182

2411

exitcode = EXIT_FAILURE;

2183

2412

goto end;

2206

2435

break;

2207

2436

}

2208

2437

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2438

errno = bring_up_interface(interface, delay);

2210

2439

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2440

if(errno != 0){

2213

2441

perror_plus("Failed to bring up interface");

2214

2442

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2443

errno = argz_add(&interfaces_to_take_down,

2444

&interfaces_to_take_down_size,

2445

interface);

2446

if(errno != 0){

2447

perror_plus("argz_add");

2448

}

2218

2449

}

2219

2450

}

2220

2451

}

2249

2480

goto end;

2250

2481

}

2251

2482

2252

if(mkdtemp(tempdir) == NULL){

2483

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

2484

tempdir = mkdtemp(run_tempdir);

2485

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

2486

if(debug){

2487

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

2488

run_tempdir, old_tempdir);

2489

}

2490

tempdir = mkdtemp(old_tempdir);

2491

}

2492

if(tempdir == NULL){

2253

2493

perror_plus("mkdtemp");

2254

2494

goto end;

2255

2495

}

2256

tempdir_created = true;

2257

2496

2258

2497

if(quit_now){

2259

2498

goto end;

2334

2573

sleep((unsigned int)retry_interval);

2335

2574

}

2336

2575

2337

if (not quit_now){

2576

if(not quit_now){

2338

2577

exitcode = EXIT_SUCCESS;

2339

2578

}

2340

2579

2395

2634

if(debug){

2396

2635

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

2397

2636

}

2398

2637

2399

2638

ret = avahi_loop_with_timeout(simple_poll,

2400

2639

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

2401

2640

if(debug){

2437

2676

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

2438

2677

while(mc.current_server != NULL){

2439

2678

server *next = mc.current_server->next;

2679

#ifdef __GNUC__

2680

#pragma GCC diagnostic push

2681

#pragma GCC diagnostic ignored "-Wcast-qual"

2682

#endif

2683

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

2684

#ifdef __GNUC__

2685

#pragma GCC diagnostic pop

2686

#endif

2440

2687

free(mc.current_server);

2441

2688

mc.current_server = next;

2442

2689

}

2443

2690

}

2444

2691

2445

/* Re-raise priviliges */

2692

/* Re-raise privileges */

2446

2693

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

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

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2463

}

2464

}

2465

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

2466

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

2467

" down\n");

2468

}

2469

}

2470

2471

lower_privileges_permanently();

2694

ret_errno = raise_privileges();

2695

if(ret_errno != 0){

2696

errno = ret_errno;

2697

perror_plus("Failed to raise privileges");

2698

} else {

2699

2700

/* Run network hooks */

2701

run_network_hooks("stop", interfaces_hooks != NULL ?

2702

interfaces_hooks : "", delay);

2703

2704

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

2705

{

2706

char *interface = NULL;

2707

while((interface=argz_next(interfaces_to_take_down,

2708

interfaces_to_take_down_size,

2709

interface))){

2710

ret_errno = take_down_interface(interface);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

2713

perror_plus("Failed to take down interface");

2714

}

2715

}

2716

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

2717

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

2718

" down\n");

2719

}

2720

}

2721

}

2722

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("Failed to lower privileges permanently");

2727

}

2472

2728

}

2473

2729

2474

2730

free(interfaces_to_take_down);

2475

2731

free(interfaces_hooks);

2476

2732

2477

2733

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

2478

if(tempdir_created){

2734

if(tempdir != NULL){

2479

2735

struct dirent **direntries = NULL;

2480

struct dirent *direntry = NULL;

2481

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

2482

alphasort);

2483

if (numentries > 0){

2484

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

2485

direntry = direntries[i];

2486

char *fullname = NULL;

2487

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

2488

direntry->d_name);

2489

if(ret < 0){

2490

perror_plus("asprintf");

2491

continue;

2492

}

2493

ret = remove(fullname);

2494

if(ret == -1){

2495

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

2496

strerror(errno));

2497

}

2498

free(fullname);

2736

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

2737

O_NOFOLLOW));

2738

if(tempdir_fd == -1){

2739

perror_plus("open");

2740

} else {

2741

#ifdef __GLIBC__

2742

#if __GLIBC_PREREQ(2, 15)

2743

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

2744

notdotentries, alphasort);

2745

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

2746

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

2747

alphasort);

2748

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

2749

#else /* not __GLIBC__ */

2750

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

2751

alphasort);

2752

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2754

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

2755

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

2756

if(ret == -1){

2757

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

2758

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

2759

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

2760

}

2761

free(direntries[i]);

2762

}

2763

2764

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

2765

free(direntries);

2766

if(numentries == -1){

2767

perror_plus("scandir");

2768

}

2769

ret = rmdir(tempdir);

2770

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

2771

perror_plus("rmdir");

2772

}

2499

2773

}

2500

}

2501

2502

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

2503

free(direntries);

2504

if (numentries == -1){

2505

perror_plus("scandir");

2506

}

2507

ret = rmdir(tempdir);

2508

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

2509

perror_plus("rmdir");

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2510

2775

}

2511

2776

}

2512

2777