/mandos/trunk : revision 602

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

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

45

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

46

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

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

getnameinfo() */

60

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

58

inet_pton(), connect() */

59

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

61

60

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

62

61

*/

63

62

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

73

72

*/

74

73

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

75

74

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

76

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

77

unlinkat() */

78

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

75

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

76

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

79

77

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

80

78

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

81

79

argp_state, struct argp,

93

91

argz_delete(), argz_append(),

94

92

argz_stringify(), argz_add(),

95

93

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

94

99

95

#ifdef __linux__

100

96

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

142

138

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

143

139

char *connect_to = NULL;

144

140

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

141

uid_t uid = 65534;

147

142

gid_t gid = 65534;

148

143

166

161

const char *priority;

167

162

gpgme_ctx_t ctx;

168

163

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

164

} mandos_context;

172

165

173

166

/* global so signal handler can reach it*/

185

178

perror(print_text);

186

179

}

187

180

188

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

181

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

189

182

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

190

183

va_list ap;

191

184

va_start (ap, format);

192

185

193

186

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

194

187

program_invocation_short_name));

195

return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

188

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

196

189

}

197

190

198

191

/*

200

193

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

201

194

* "buffer_length" is how much is already used.

202

195

*/

203

__attribute__((nonnull, warn_unused_result))

204

196

size_t incbuffer(char **buffer, size_t buffer_length,

205

197

size_t buffer_capacity){

206

198

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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;

199

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

200

if(buffer == NULL){

213

201

return 0;

214

202

}

215

*buffer = new_buf;

216

203

buffer_capacity += BUFFER_SIZE;

217

204

}

218

205

return buffer_capacity;

219

206

}

220

207

221

208

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

222

__attribute__((nonnull, warn_unused_result))

223

209

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

224

210

int af, server **current_server){

225

211

int ret;

234

220

.af = af };

235

221

if(new_server->ip == NULL){

236

222

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);

252

223

return false;

253

224

}

254

225

/* Special case of first server */

256

227

new_server->next = new_server;

257

228

new_server->prev = new_server;

258

229

*current_server = new_server;

230

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

259

231

} else {

260

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

261

232

new_server->next = *current_server;

262

233

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

263

234

new_server->prev->next = new_server;

264

235

(*current_server)->prev = new_server;

265

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

266

242

return true;

267

243

}

268

244

269

245

/*

270

246

* Initialize GPGME.

271

247

*/

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){

248

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

249

const char *tempdir, mandos_context *mc){

277

250

gpgme_error_t rc;

278

251

gpgme_engine_info_t engine_info;

279

252

280

253

/*

281

254

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

282

255

*/

283

bool import_key(const char * const filename){

256

bool import_key(const char *filename){

284

257

int ret;

285

258

int fd;

286

259

gpgme_data_t pgp_data;

367

340

* Decrypt OpenPGP data.

368

341

* Returns -1 on error

369

342

*/

370

__attribute__((nonnull, warn_unused_result))

371

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

344

size_t crypto_size,

373

345

char **plaintext,

493

465

return plaintext_length;

494

466

}

495

467

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){

468

static const char * safer_gnutls_strerror(int value){

505

469

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

470

if(ret == NULL)

471

ret = "(unknown)";

472

return ret;

507

473

}

508

474

509

475

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

476

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

512

477

const char* string){

513

478

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

514

479

}

515

480

516

__attribute__((nonnull, warn_unused_result))

517

481

static int init_gnutls_global(const char *pubkeyfilename,

518

482

const char *seckeyfilename,

519

483

mandos_context *mc){

520

484

int ret;

521

unsigned int uret;

522

485

523

486

if(debug){

524

487

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

575

538

safer_gnutls_strerror(ret));

576

539

goto globalfail;

577

540

}

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

}

679

541

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

680

542

if(ret != GNUTLS_E_SUCCESS){

681

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

682

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

543

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

544

safer_gnutls_strerror(ret));

683

545

goto globalfail;

684

546

}

685

547

695

557

return -1;

696

558

}

697

559

698

__attribute__((nonnull, warn_unused_result))

699

560

static int init_gnutls_session(gnutls_session_t *session,

700

561

mandos_context *mc){

701

562

int ret;

758

619

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

759

620

760

621

/* Called when a Mandos server is found */

761

__attribute__((nonnull, warn_unused_result))

762

622

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

763

623

AvahiIfIndex if_index,

764

624

int af, mandos_context *mc){

765

625

int ret, tcp_sd = -1;

766

626

ssize_t sret;

767

struct sockaddr_storage to;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

768

631

char *buffer = NULL;

769

632

char *decrypted_buffer = NULL;

770

633

size_t buffer_length = 0;

794

657

return -1;

795

658

}

796

659

797

/* If the interface is specified and we have a list of interfaces */

798

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

799

/* Check if the interface is one of the interfaces we are using */

800

bool match = false;

801

{

802

char *interface = NULL;

803

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

804

interface))){

805

if(if_nametoindex(interface) == (unsigned int)if_index){

806

match = true;

807

break;

808

}

809

}

810

}

811

if(not match){

812

/* This interface does not match any in the list, so we don't

813

connect to the server */

814

if(debug){

815

char interface[IF_NAMESIZE];

816

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

817

perror_plus("if_indextoname");

818

} else {

819

fprintf_plus(stderr, "Skipping server on non-used interface"

820

" \"%s\"\n",

821

if_indextoname((unsigned int)if_index,

822

interface));

823

}

824

}

825

return -1;

826

}

827

}

828

829

660

ret = init_gnutls_session(&session, mc);

830

661

if(ret != 0){

831

662

return -1;

851

682

852

683

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

853

684

if(af == AF_INET6){

854

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

855

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

685

to.in6.sin6_family = (sa_family_t)af;

686

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

856

687

} else { /* IPv4 */

857

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

858

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

688

to.in.sin_family = (sa_family_t)af;

689

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

859

690

}

860

691

if(ret < 0 ){

861

692

int e = errno;

870

701

goto mandos_end;

871

702

}

872

703

if(af == AF_INET6){

873

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

874

if(IN6_IS_ADDR_LINKLOCAL

875

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

704

to.in6.sin6_port = htons(port);

705

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

706

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

707

-Wunreachable-code*/

876

708

if(if_index == AVAHI_IF_UNSPEC){

877

709

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

878

710

" incomplete without a network interface\n");

880

712

goto mandos_end;

881

713

}

882

714

/* Set the network interface number as scope */

883

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

715

to.in6.sin6_scope_id = (uint32_t)if_index;

884

716

}

885

717

} else {

886

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

718

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

719

-Wconversion and

720

-Wunreachable-code */

887

721

}

888

722

889

723

if(quit_now){

906

740

}

907

741

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

908

742

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

743

const char *pcret;

909

744

if(af == AF_INET6){

910

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

911

sizeof(struct sockaddr_in6),

912

addrstr, sizeof(addrstr), NULL, 0,

913

NI_NUMERICHOST);

745

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

746

sizeof(addrstr));

914

747

} else {

915

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

916

sizeof(struct sockaddr_in),

917

addrstr, sizeof(addrstr), NULL, 0,

918

NI_NUMERICHOST);

748

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

749

sizeof(addrstr));

919

750

}

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);

751

if(pcret == NULL){

752

perror_plus("inet_ntop");

753

} else {

754

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

755

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

756

}

926

757

}

927

758

}

928

759

932

763

}

933

764

934

765

if(af == AF_INET6){

935

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

936

sizeof(struct sockaddr_in6));

766

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

937

767

} else {

938

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

939

sizeof(struct sockaddr_in));

768

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

940

769

}

941

770

if(ret < 0){

942

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

771

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

943

772

int e = errno;

944

773

perror_plus("connect");

945

774

errno = e;

1160

989

return retval;

1161

990

}

1162

991

1163

__attribute__((nonnull))

1164

992

static void resolve_callback(AvahiSServiceResolver *r,

1165

993

AvahiIfIndex interface,

1166

994

AvahiProtocol proto,

1174

1002

AVAHI_GCC_UNUSED AvahiStringList *txt,

1175

1003

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1176

1004

flags,

1177

void *mc){

1005

void* mc){

1178

1006

if(r == NULL){

1179

1007

return;

1180

1008

}

1183

1011

timed out */

1184

1012

1185

1013

if(quit_now){

1186

avahi_s_service_resolver_free(r);

1187

1014

return;

1188

1015

}

1189

1016

1234

1061

const char *domain,

1235

1062

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1236

1063

flags,

1237

void *mc){

1064

void* mc){

1238

1065

if(b == NULL){

1239

1066

return;

1240

1067

}

1300

1127

errno = old_errno;

1301

1128

}

1302

1129

1303

__attribute__((nonnull, warn_unused_result))

1304

1130

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

1305

1131

int ret;

1306

1132

error_t ret_errno;

1325

1151

return true;

1326

1152

}

1327

1153

1328

__attribute__((nonnull, warn_unused_result))

1329

1154

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

1330

1155

1331

1156

/* Reject the loopback device */

1373

1198

* corresponds to an acceptable network device.

1374

1199

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

1375

1200

*/

1376

__attribute__((nonnull, warn_unused_result))

1377

1201

int good_interface(const struct dirent *if_entry){

1378

1202

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

1379

1203

return 0;

1397

1221

/*

1398

1222

* This function determines if a network interface is up.

1399

1223

*/

1400

__attribute__((nonnull, warn_unused_result))

1401

1224

bool interface_is_up(const char *interface){

1402

1225

struct ifreq ifr;

1403

1226

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

1414

1237

/*

1415

1238

* This function determines if a network interface is running

1416

1239

*/

1417

__attribute__((nonnull, warn_unused_result))

1418

1240

bool interface_is_running(const char *interface){

1419

1241

struct ifreq ifr;

1420

1242

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

1428

1250

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

1429

1251

}

1430

1252

1431

__attribute__((nonnull, pure, warn_unused_result))

1432

1253

int notdotentries(const struct dirent *direntry){

1433

1254

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

1434

1255

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

1441

1262

}

1442

1263

1443

1264

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

1444

__attribute__((nonnull, warn_unused_result))

1445

1265

int runnable_hook(const struct dirent *direntry){

1446

1266

int ret;

1447

1267

size_t sret;

1455

1275

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

1456

1276

"abcdefghijklmnopqrstuvwxyz"

1457

1277

"0123456789"

1458

"_.-");

1278

"_-");

1459

1279

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

1460

1280

/* Contains non-allowed characters */

1461

1281

if(debug){

1465

1285

return 0;

1466

1286

}

1467

1287

1468

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

1288

char *fullname = NULL;

1289

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

1290

if(ret < 0){

1291

perror_plus("asprintf");

1292

return 0;

1293

}

1294

1295

ret = stat(fullname, &st);

1469

1296

if(ret == -1){

1470

1297

if(debug){

1471

1298

perror_plus("Could not stat hook");

1495

1322

return 1;

1496

1323

}

1497

1324

1498

__attribute__((nonnull, warn_unused_result))

1499

1325

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1500

1326

mandos_context *mc){

1501

1327

int ret;

1505

1331

1506

1332

while(true){

1507

1333

if(mc->current_server == NULL){

1508

if(debug){

1334

if (debug){

1509

1335

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

1510

1336

" No timeout!\n");

1511

1337

}

1512

1338

ret = avahi_simple_poll_iterate(s, -1);

1513

1339

} else {

1514

if(debug){

1340

if (debug){

1515

1341

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

1516

1342

" it, or wait\n");

1517

1343

}

1534

1360

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

1535

1361

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

1536

1362

1537

if(debug){

1363

if (debug){

1538

1364

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

1539

1365

block_time);

1540

1366

}

1562

1388

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

1563

1389

}

1564

1390

if(ret != 0){

1565

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

1391

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

1566

1392

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

1567

1393

}

1568

1394

}

1570

1396

}

1571

1397

1572

1398

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

1573

__attribute__((warn_unused_result))

1574

1399

error_t raise_privileges(void){

1575

1400

error_t old_errno = errno;

1576

1401

error_t ret_errno = 0;

1577

1402

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

1578

1403

ret_errno = errno;

1404

perror_plus("seteuid");

1579

1405

}

1580

1406

errno = old_errno;

1581

1407

return ret_errno;

1582

1408

}

1583

1409

1584

1410

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

1585

__attribute__((warn_unused_result))

1586

1411

error_t raise_privileges_permanently(void){

1587

1412

error_t old_errno = errno;

1588

1413

error_t ret_errno = raise_privileges();

1592

1417

}

1593

1418

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

1594

1419

ret_errno = errno;

1420

perror_plus("seteuid");

1595

1421

}

1596

1422

errno = old_errno;

1597

1423

return ret_errno;

1598

1424

}

1599

1425

1600

1426

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

1601

__attribute__((warn_unused_result))

1602

1427

error_t lower_privileges(void){

1603

1428

error_t old_errno = errno;

1604

1429

error_t ret_errno = 0;

1605

1430

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

1606

1431

ret_errno = errno;

1432

perror_plus("seteuid");

1607

1433

}

1608

1434

errno = old_errno;

1609

1435

return ret_errno;

1610

1436

}

1611

1437

1612

1438

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1614

1439

error_t lower_privileges_permanently(void){

1615

1440

error_t old_errno = errno;

1616

1441

error_t ret_errno = 0;

1617

1442

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

1618

1443

ret_errno = errno;

1444

perror_plus("setuid");

1619

1445

}

1620

1446

errno = old_errno;

1621

1447

return ret_errno;

1622

1448

}

1623

1449

1624

__attribute__((nonnull))

1625

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

1450

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

1626

1451

const float delay){

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__ */

1452

struct dirent **direntries;

1453

struct dirent *direntry;

1454

int ret;

1455

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

1456

alphasort);

1654

1457

if(numhooks == -1){

1655

perror_plus("scandir");

1656

return;

1657

}

1658

struct dirent *direntry;

1659

int ret;

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);

1458

if(errno == ENOENT){

1459

if(debug){

1460

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

1461

" found\n", hookdir);

1462

}

1463

} else {

1464

perror_plus("scandir");

1666

1465

}

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){

1466

} else {

1467

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

1468

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

1469

direntry = direntries[i];

1470

char *fullname = NULL;

1471

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

1472

if(ret < 0){

1728

1473

perror_plus("asprintf");

1729

_exit(EX_OSERR);

1730

}

1731

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

1732

if(ret == -1){

1474

continue;

1475

}

1476

if(debug){

1477

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

1478

direntry->d_name);

1479

}

1480

pid_t hook_pid = fork();

1481

if(hook_pid == 0){

1482

/* Child */

1483

/* Raise privileges */

1484

raise_privileges_permanently();

1485

/* Set group */

1486

errno = 0;

1487

ret = setgid(0);

1488

if(ret == -1){

1489

perror_plus("setgid");

1490

}

1491

/* Reset supplementary groups */

1492

errno = 0;

1493

ret = setgroups(0, NULL);

1494

if(ret == -1){

1495

perror_plus("setgroups");

1496

}

1497

dup2(devnull, STDIN_FILENO);

1498

close(devnull);

1499

dup2(STDERR_FILENO, STDOUT_FILENO);

1500

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

1501

if(ret == -1){

1502

perror_plus("setenv");

1503

_exit(EX_OSERR);

1504

}

1505

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

1506

if(ret == -1){

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

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

1511

if(ret == -1){

1512

perror_plus("setenv");

1513

_exit(EX_OSERR);

1514

}

1515

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

1516

if(ret == -1){

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

char *delaystring;

1521

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

1522

if(ret == -1){

1523

perror_plus("asprintf");

1524

_exit(EX_OSERR);

1525

}

1526

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

1527

if(ret == -1){

1528

free(delaystring);

1529

perror_plus("setenv");

1530

_exit(EX_OSERR);

1531

}

1733

1532

free(delaystring);

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;

1533

if(connect_to != NULL){

1534

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

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

}

1540

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

1541

perror_plus("execl");

1542

_exit(EXIT_FAILURE);

1543

}

1785

1544

} else {

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);

1545

int status;

1546

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

1547

perror_plus("waitpid");

1548

free(fullname);

1549

continue;

1550

}

1551

if(WIFEXITED(status)){

1552

if(WEXITSTATUS(status) != 0){

1553

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

1554

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

1555

WEXITSTATUS(status));

1556

free(fullname);

1557

continue;

1558

}

1559

} else if(WIFSIGNALED(status)){

1560

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

1561

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

1562

WTERMSIG(status));

1563

free(fullname);

1564

continue;

1565

} else {

1566

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

1567

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

1568

free(fullname);

1569

continue;

1570

}

1571

}

1572

free(fullname);

1573

if(debug){

1574

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

1575

direntry->d_name);

1576

}

1577

}

1578

close(devnull);

1579

}

1580

return true;

1805

1581

}

1806

1582

1807

__attribute__((nonnull, warn_unused_result))

1808

1583

error_t bring_up_interface(const char *const interface,

1809

1584

const float delay){

1585

int sd = -1;

1810

1586

error_t old_errno = errno;

1811

int ret;

1587

error_t ret_errno = 0;

1588

int ret, ret_setflags;

1812

1589

struct ifreq network;

1813

1590

unsigned int if_index = if_nametoindex(interface);

1814

1591

if(if_index == 0){

1823

1600

}

1824

1601

1825

1602

if(not interface_is_up(interface)){

1826

error_t ret_errno = 0, ioctl_errno = 0;

1827

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

1603

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

1828

1604

ret_errno = errno;

1829

1605

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

1830

1606

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

1831

errno = old_errno;

1832

1607

return ret_errno;

1833

1608

}

1834

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

1609

network.ifr_flags |= IFF_UP;

1835

1610

1836

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

1837

if(sd == -1){

1611

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1612

if(sd < 0){

1838

1613

ret_errno = errno;

1839

1614

perror_plus("socket");

1840

1615

errno = old_errno;

1841

1616

return ret_errno;

1842

1617

}

1843

1618

1844

1619

if(quit_now){

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1620

close(sd);

1849

1621

errno = old_errno;

1850

1622

return EINTR;

1851

1623

}

1855

1627

interface);

1856

1628

}

1857

1629

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

}

1630

/* Raise priviliges */

1631

raise_privileges();

1864

1632

1865

1633

#ifdef __linux__

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

}

1634

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1635

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

1636

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

1637

bool restore_loglevel = true;

1638

if(ret_linux == -1){

1639

restore_loglevel = false;

1640

perror_plus("klogctl");

1877

1641

}

1878

1642

#endif /* __linux__ */

1879

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

1880

ioctl_errno = errno;

1643

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

1644

ret_errno = errno;

1881

1645

#ifdef __linux__

1882

1646

if(restore_loglevel){

1883

1647

ret_linux = klogctl(7, NULL, 0);

1887

1651

}

1888

1652

#endif /* __linux__ */

1889

1653

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

}

1654

/* Lower privileges */

1655

lower_privileges();

1899

1656

1900

1657

/* Close the socket */

1901

1658

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

1904

1661

}

1905

1662

1906

1663

if(ret_setflags == -1){

1907

errno = ioctl_errno;

1664

errno = ret_errno;

1908

1665

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1909

1666

errno = old_errno;

1910

return ioctl_errno;

1667

return ret_errno;

1911

1668

}

1912

1669

} else if(debug){

1913

1670

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

1931

1688

return 0;

1932

1689

}

1933

1690

1934

__attribute__((nonnull, warn_unused_result))

1935

1691

error_t take_down_interface(const char *const interface){

1692

int sd = -1;

1936

1693

error_t old_errno = errno;

1694

error_t ret_errno = 0;

1695

int ret, ret_setflags;

1937

1696

struct ifreq network;

1938

1697

unsigned int if_index = if_nametoindex(interface);

1939

1698

if(if_index == 0){

1942

1701

return ENXIO;

1943

1702

}

1944

1703

if(interface_is_up(interface)){

1945

error_t ret_errno = 0, ioctl_errno = 0;

1946

1704

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

1947

1705

ret_errno = errno;

1948

1706

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

1949

1707

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

1950

errno = old_errno;

1951

1708

return ret_errno;

1952

1709

}

1953

1710

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

1954

1711

1955

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

1956

if(sd == -1){

1712

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1713

if(sd < 0){

1957

1714

ret_errno = errno;

1958

1715

perror_plus("socket");

1959

1716

errno = old_errno;

1965

1722

interface);

1966

1723

}

1967

1724

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

}

1725

/* Raise priviliges */

1726

raise_privileges();

1727

1728

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

1729

ret_errno = errno;

1730

1731

/* Lower privileges */

1732

lower_privileges();

1987

1733

1988

1734

/* Close the socket */

1989

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

1735

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

1990

1736

if(ret == -1){

1991

1737

perror_plus("close");

1992

1738

}

1993

1739

1994

1740

if(ret_setflags == -1){

1995

errno = ioctl_errno;

1741

errno = ret_errno;

1996

1742

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1997

1743

errno = old_errno;

1998

return ioctl_errno;

1744

return ret_errno;

1999

1745

}

2000

1746

} else if(debug){

2001

1747

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

2007

1753

}

2008

1754

2009

1755

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

2010

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

1756

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

2011

1757

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

2012

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

2013

.interfaces = NULL, .interfaces_size = 0 };

1758

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

2014

1759

AvahiSServiceBrowser *sb = NULL;

2015

1760

error_t ret_errno;

2016

1761

int ret;

2017

1762

intmax_t tmpmax;

2018

1763

char *tmp;

2019

1764

int exitcode = EXIT_SUCCESS;

1765

char *interfaces = NULL;

1766

size_t interfaces_size = 0;

2020

1767

char *interfaces_to_take_down = NULL;

2021

1768

size_t interfaces_to_take_down_size = 0;

2022

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

2023

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

2024

char *tempdir = NULL;

1769

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

1770

bool tempdir_created = false;

2025

1771

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2026

1772

const char *seckey = PATHDIR "/" SECKEY;

2027

1773

const char *pubkey = PATHDIR "/" PUBKEY;

2028

1774

char *interfaces_hooks = NULL;

1775

size_t interfaces_hooks_size = 0;

2029

1776

2030

1777

bool gnutls_initialized = false;

2031

1778

bool gpgme_initialized = false;

2122

1869

connect_to = arg;

2123

1870

break;

2124

1871

case 'i': /* --interface */

2125

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

2126

arg, (int)',');

1872

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1873

(int)',');

2127

1874

if(ret_errno != 0){

2128

1875

argp_error(state, "%s", strerror(ret_errno));

2129

1876

}

2209

1956

/* Work around Debian bug #633582:

2210

1957

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

2211

1958

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 {

1959

/* Re-raise priviliges */

1960

if(raise_privileges() == 0){

2218

1961

struct stat st;

2219

1962

2220

1963

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

2260

2003

}

2261

2004

2262

2005

/* Lower privileges */

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

2006

errno = 0;

2007

ret = seteuid(uid);

2008

if(ret == -1){

2009

perror_plus("seteuid");

2267

2010

}

2268

2011

}

2269

2012

}

2270

2013

2271

/* Remove invalid interface names (except "none") */

2014

/* Remove empty interface names */

2272

2015

{

2273

2016

char *interface = NULL;

2274

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2017

while((interface = argz_next(interfaces, interfaces_size,

2275

2018

interface))){

2276

if(strcmp(interface, "none") != 0

2277

and if_nametoindex(interface) == 0){

2278

if(interface[0] != '\0'){

2019

if(if_nametoindex(interface) == 0){

2020

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2279

2021

fprintf_plus(stderr, "Not using nonexisting interface"

2280

2022

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

2281

2023

}

2282

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2024

argz_delete(&interfaces, &interfaces_size, interface);

2283

2025

interface = NULL;

2284

2026

}

2285

2027

}

2287

2029

2288

2030

/* Run network hooks */

2289

2031

{

2290

if(mc.interfaces != NULL){

2291

interfaces_hooks = malloc(mc.interfaces_size);

2032

2033

if(interfaces != NULL){

2034

interfaces_hooks = malloc(interfaces_size);

2292

2035

if(interfaces_hooks == NULL){

2293

2036

perror_plus("malloc");

2294

2037

goto end;

2295

2038

}

2296

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

2297

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

2298

}

2299

run_network_hooks("start", interfaces_hooks != NULL ?

2300

interfaces_hooks : "", delay);

2039

memcpy(interfaces_hooks, interfaces, interfaces_size);

2040

interfaces_hooks_size = interfaces_size;

2041

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2042

(int)',');

2043

}

2044

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

2045

interfaces_hooks : "", delay)){

2046

goto end;

2047

}

2301

2048

}

2302

2049

2303

2050

if(not debug){

2380

2127

}

2381

2128

2382

2129

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

2383

if(mc.interfaces == NULL){

2384

struct dirent **direntries = NULL;

2130

if(interfaces == NULL){

2131

struct dirent **direntries;

2385

2132

/* Look for any good interfaces */

2386

2133

ret = scandir(sys_class_net, &direntries, good_interface,

2387

2134

alphasort);

2388

2135

if(ret >= 1){

2389

2136

/* Add all found interfaces to interfaces list */

2390

2137

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

2391

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

2138

ret_errno = argz_add(&interfaces, &interfaces_size,

2392

2139

direntries[i]->d_name);

2393

2140

if(ret_errno != 0){

2394

errno = ret_errno;

2395

2141

perror_plus("argz_add");

2396

free(direntries[i]);

2397

2142

continue;

2398

2143

}

2399

2144

if(debug){

2400

2145

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

2401

2146

direntries[i]->d_name);

2402

2147

}

2403

free(direntries[i]);

2404

2148

}

2405

2149

free(direntries);

2406

2150

} else {

2407

if(ret == 0){

2408

free(direntries);

2409

}

2151

free(direntries);

2410

2152

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

2411

2153

exitcode = EXIT_FAILURE;

2412

2154

goto end;

2413

2155

}

2414

2156

}

2415

2157

2416

/* Bring up interfaces which are down, and remove any "none"s */

2417

{

2158

/* If we only got one interface, explicitly use only that one */

2159

if(argz_count(interfaces, interfaces_size) == 1){

2160

if(debug){

2161

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2162

interfaces);

2163

}

2164

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2165

}

2166

2167

/* Bring up interfaces which are down */

2168

if(not (argz_count(interfaces, interfaces_size) == 1

2169

and strcmp(interfaces, "none") == 0)){

2418

2170

char *interface = NULL;

2419

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2171

while((interface = argz_next(interfaces, interfaces_size,

2420

2172

interface))){

2421

/* If interface name is "none", stop bringing up interfaces.

2422

Also remove all instances of "none" from the list */

2423

if(strcmp(interface, "none") == 0){

2424

argz_delete(&mc.interfaces, &mc.interfaces_size,

2425

interface);

2426

interface = NULL;

2427

while((interface = argz_next(mc.interfaces,

2428

mc.interfaces_size, interface))){

2429

if(strcmp(interface, "none") == 0){

2430

argz_delete(&mc.interfaces, &mc.interfaces_size,

2431

interface);

2432

interface = NULL;

2433

}

2434

}

2435

break;

2436

}

2437

2173

bool interface_was_up = interface_is_up(interface);

2438

errno = bring_up_interface(interface, delay);

2174

ret = bring_up_interface(interface, delay);

2439

2175

if(not interface_was_up){

2440

if(errno != 0){

2176

if(ret != 0){

2177

errno = ret;

2441

2178

perror_plus("Failed to bring up interface");

2442

2179

} else {

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

}

2180

ret_errno = argz_add(&interfaces_to_take_down,

2181

&interfaces_to_take_down_size,

2182

interface);

2449

2183

}

2450

2184

}

2451

2185

}

2186

free(interfaces);

2187

interfaces = NULL;

2188

interfaces_size = 0;

2452

2189

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

2453

2190

fprintf_plus(stderr, "No interfaces were brought up\n");

2454

2191

}

2455

2192

}

2456

2193

2457

/* If we only got one interface, explicitly use only that one */

2458

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2459

if(debug){

2460

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2461

mc.interfaces);

2462

}

2463

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

2464

}

2465

2466

2194

if(quit_now){

2467

2195

goto end;

2468

2196

}

2480

2208

goto end;

2481

2209

}

2482

2210

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){

2211

if(mkdtemp(tempdir) == NULL){

2493

2212

perror_plus("mkdtemp");

2494

2213

goto end;

2495

2214

}

2215

tempdir_created = true;

2496

2216

2497

2217

if(quit_now){

2498

2218

goto end;

2534

2254

exitcode = EX_USAGE;

2535

2255

goto end;

2536

2256

}

2537

2257

2538

2258

if(quit_now){

2539

2259

goto end;

2540

2260

}

2570

2290

fprintf_plus(stderr, "Retrying in %d seconds\n",

2571

2291

(int)retry_interval);

2572

2292

}

2573

sleep((unsigned int)retry_interval);

2293

sleep((int)retry_interval);

2574

2294

}

2575

2295

2576

if(not quit_now){

2296

if (not quit_now){

2577

2297

exitcode = EXIT_SUCCESS;

2578

2298

}

2579

2299

2634

2354

if(debug){

2635

2355

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

2636

2356

}

2637

2357

2638

2358

ret = avahi_loop_with_timeout(simple_poll,

2639

2359

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

2640

2360

if(debug){

2649

2369

}

2650

2370

2651

2371

/* Cleanup things */

2652

free(mc.interfaces);

2653

2654

2372

if(sb != NULL)

2655

2373

avahi_s_service_browser_free(sb);

2656

2374

2676

2394

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

2677

2395

while(mc.current_server != NULL){

2678

2396

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

2687

2397

free(mc.current_server);

2688

2398

mc.current_server = next;

2689

2399

}

2690

2400

}

2691

2401

2692

/* Re-raise privileges */

2402

/* Re-raise priviliges */

2693

2403

{

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

}

2404

raise_privileges();

2405

2406

/* Run network hooks */

2407

run_network_hooks("stop", interfaces_hooks != NULL ?

2408

interfaces_hooks : "", delay);

2409

2410

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

2411

{

2412

char *interface = NULL;

2413

while((interface=argz_next(interfaces_to_take_down,

2414

interfaces_to_take_down_size,

2415

interface))){

2416

ret_errno = take_down_interface(interface);

2417

if(ret_errno != 0){

2418

errno = ret_errno;

2419

perror_plus("Failed to take down interface");

2420

}

2421

}

2422

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

2423

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

2424

" down\n");

2425

}

2426

}

2427

2428

lower_privileges_permanently();

2728

2429

}

2729

2430

2730

2431

free(interfaces_to_take_down);

2731

2432

free(interfaces_hooks);

2732

2433

2733

2434

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

2734

if(tempdir != NULL){

2435

if(tempdir_created){

2735

2436

struct dirent **direntries = NULL;

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

}

2437

struct dirent *direntry = NULL;

2438

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

2439

alphasort);

2440

if (numentries > 0){

2441

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

2442

direntry = direntries[i];

2443

char *fullname = NULL;

2444

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

2445

direntry->d_name);

2446

if(ret < 0){

2447

perror_plus("asprintf");

2448

continue;

2449

}

2450

ret = remove(fullname);

2451

if(ret == -1){

2452

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

2453

strerror(errno));

2454

}

2455

free(fullname);

2773

2456

}

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2457

}

2458

2459

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

2460

free(direntries);

2461

if (numentries == -1){

2462

perror_plus("scandir");

2463

}

2464

ret = rmdir(tempdir);

2465

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

2466

perror_plus("rmdir");

2775

2467

}

2776

2468

}

2777

2469