/mandos/release : revision 237.16.14

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

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

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

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stdout, ferror() */

44

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

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stdout, ferror(), remove() */

44

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

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

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

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strtof(), abort() */

55

opendir(), DIR */

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

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

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inet_pton(), connect(),

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getnameinfo() */

60

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

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inet_pton(), connect() */

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

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

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61

*/

63

62

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

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63

strtoimax() */

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#include <assert.h> /* assert() */

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#include <errno.h> /* perror(), errno,

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program_invocation_short_name */

67

#include <time.h> /* nanosleep(), time(), sleep() */

73

*/

74

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

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

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

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unlinkat() */

78

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

76

setgid(), pause() */

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

88

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

89

88

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

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89

WEXITSTATUS(), WTERMSIG() */

91

#include <grp.h> /* setgroups() */

92

#include <argz.h> /* argz_add_sep(), argz_next(),

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argz_delete(), argz_append(),

94

argz_stringify(), argz_add(),

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

90

99

91

#ifdef __linux__

100

92

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

142

134

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

143

135

char *connect_to = NULL;

144

136

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

148

137

149

138

/* Doubly linked list that need to be circularly linked when used */

150

139

typedef struct server{

151

140

const char *ip;

152

in_port_t port;

141

uint16_t port;

153

142

AvahiIfIndex if_index;

154

143

int af;

155

144

struct timespec last_seen;

159

148

160

149

/* Used for passing in values through the Avahi callback functions */

161

150

typedef struct {

151

AvahiSimplePoll *simple_poll;

162

152

AvahiServer *server;

163

153

gnutls_certificate_credentials_t cred;

164

154

unsigned int dh_bits;

166

156

const char *priority;

167

157

gpgme_ctx_t ctx;

168

158

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

159

} mandos_context;

172

160

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

161

/* global context so signal handler can reach it*/

162

mandos_context mc = { .simple_poll = NULL, .server = NULL,

163

.dh_bits = 1024, .priority = "SECURE256"

164

":!CTYPE-X.509:+CTYPE-OPENPGP",

165

.current_server = NULL };

175

166

176

167

sig_atomic_t quit_now = 0;

177

168

int signal_received = 0;

178

169

179

170

/* Function to use when printing errors */

180

171

void perror_plus(const char *print_text){

181

int e = errno;

182

172

fprintf(stderr, "Mandos plugin %s: ",

183

173

program_invocation_short_name);

184

errno = e;

185

174

perror(print_text);

186

175

}

187

176

188

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

189

177

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

190

178

va_list ap;

191

179

va_start (ap, format);

192

180

193

181

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

194

182

program_invocation_short_name));

195

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

183

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

196

184

}

197

185

198

186

/*

200

188

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

201

189

* "buffer_length" is how much is already used.

202

190

*/

203

__attribute__((nonnull, warn_unused_result))

204

191

size_t incbuffer(char **buffer, size_t buffer_length,

205

192

size_t buffer_capacity){

206

193

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;

194

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

195

if(buffer == NULL){

213

196

return 0;

214

197

}

215

*buffer = new_buf;

216

198

buffer_capacity += BUFFER_SIZE;

217

199

}

218

200

return buffer_capacity;

219

201

}

220

202

221

203

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

204

int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

205

int af){

225

206

int ret;

226

207

server *new_server = malloc(sizeof(server));

227

208

if(new_server == NULL){

228

209

perror_plus("malloc");

229

return false;

210

return -1;

230

211

}

231

212

*new_server = (server){ .ip = strdup(ip),

232

213

.port = port,

234

215

.af = af };

235

216

if(new_server->ip == NULL){

236

217

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

return false;

218

return -1;

253

219

}

254

220

/* Special case of first server */

255

if(*current_server == NULL){

221

if (mc.current_server == NULL){

256

222

new_server->next = new_server;

257

223

new_server->prev = new_server;

258

*current_server = new_server;

224

mc.current_server = new_server;

225

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

259

226

} else {

260

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

261

new_server->next = *current_server;

262

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

227

new_server->next = mc.current_server;

228

new_server->prev = mc.current_server->prev;

263

229

new_server->prev->next = new_server;

264

(*current_server)->prev = new_server;

265

}

266

return true;

230

mc.current_server->prev = new_server;

231

}

232

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

233

if(ret == -1){

234

perror_plus("clock_gettime");

235

return -1;

236

}

237

return 0;

267

238

}

268

239

269

240

/*

270

241

* Initialize GPGME.

271

242

*/

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){

243

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

244

const char *tempdir){

277

245

gpgme_error_t rc;

278

246

gpgme_engine_info_t engine_info;

279

247

248

280

249

/*

281

250

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

282

251

*/

283

bool import_key(const char * const filename){

252

bool import_key(const char *filename){

284

253

int ret;

285

254

int fd;

286

255

gpgme_data_t pgp_data;

298

267

return false;

299

268

}

300

269

301

rc = gpgme_op_import(mc->ctx, pgp_data);

270

rc = gpgme_op_import(mc.ctx, pgp_data);

302

271

if(rc != GPG_ERR_NO_ERROR){

303

272

fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",

304

273

gpgme_strsource(rc), gpgme_strerror(rc));

348

317

}

349

318

350

319

/* Create new GPGME "context" */

351

rc = gpgme_new(&(mc->ctx));

320

rc = gpgme_new(&(mc.ctx));

352

321

if(rc != GPG_ERR_NO_ERROR){

353

322

fprintf_plus(stderr, "Mandos plugin mandos-client: "

354

323

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

367

336

* Decrypt OpenPGP data.

368

337

* Returns -1 on error

369

338

*/

370

__attribute__((nonnull, warn_unused_result))

371

339

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

340

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

341

char **plaintext){

375

342

gpgme_data_t dh_crypto, dh_plain;

376

343

gpgme_error_t rc;

377

344

ssize_t ret;

403

370

404

371

/* Decrypt data from the cryptotext data buffer to the plaintext

405

372

data buffer */

406

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

373

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

407

374

if(rc != GPG_ERR_NO_ERROR){

408

375

fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",

409

376

gpgme_strsource(rc), gpgme_strerror(rc));

410

377

plaintext_length = -1;

411

378

if(debug){

412

379

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

380

result = gpgme_op_decrypt_result(mc.ctx);

414

381

if(result == NULL){

415

382

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

416

383

} else {

493

460

return plaintext_length;

494

461

}

495

462

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){

505

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

463

static const char * safer_gnutls_strerror(int value){

464

const char *ret = gnutls_strerror(value); /* Spurious warning from

465

-Wunreachable-code */

466

if(ret == NULL)

467

ret = "(unknown)";

468

return ret;

507

469

}

508

470

509

471

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

472

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

512

473

const char* string){

513

474

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

514

475

}

515

476

516

__attribute__((nonnull, warn_unused_result))

517

477

static int init_gnutls_global(const char *pubkeyfilename,

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

478

const char *seckeyfilename){

521

479

int ret;

522

unsigned int uret;

523

480

524

481

if(debug){

525

482

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

541

498

}

542

499

543

500

/* OpenPGP credentials */

544

ret = gnutls_certificate_allocate_credentials(&mc->cred);

501

ret = gnutls_certificate_allocate_credentials(&mc.cred);

545

502

if(ret != GNUTLS_E_SUCCESS){

546

503

fprintf_plus(stderr, "GnuTLS memory error: %s\n",

547

504

safer_gnutls_strerror(ret));

557

514

}

558

515

559

516

ret = gnutls_certificate_set_openpgp_key_file

560

(mc->cred, pubkeyfilename, seckeyfilename,

517

(mc.cred, pubkeyfilename, seckeyfilename,

561

518

GNUTLS_OPENPGP_FMT_BASE64);

562

519

if(ret != GNUTLS_E_SUCCESS){

563

520

fprintf_plus(stderr,

569

526

}

570

527

571

528

/* GnuTLS server initialization */

572

ret = gnutls_dh_params_init(&mc->dh_params);

529

ret = gnutls_dh_params_init(&mc.dh_params);

573

530

if(ret != GNUTLS_E_SUCCESS){

574

531

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

575

532

" initialization: %s\n",

576

533

safer_gnutls_strerror(ret));

577

534

goto globalfail;

578

535

}

579

/* If a Diffie-Hellman parameters file was given, try to use it */

580

if(dhparamsfilename != NULL){

581

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

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

params_capacity = incbuffer((char **)&params.data,

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

if(params.data == NULL){

619

dhparamsfilename = NULL;

620

}

621

if(dhparamsfilename == NULL){

622

break;

623

}

624

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

625

GNUTLS_X509_FMT_PEM);

626

if(ret != GNUTLS_E_SUCCESS){

627

fprintf_plus(stderr, "Failed to parse DH parameters in file"

628

" \"%s\": %s\n", dhparamsfilename,

629

safer_gnutls_strerror(ret));

630

dhparamsfilename = NULL;

631

}

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

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

637

/* Try to read the private key file */

638

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

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

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

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

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

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

689

if(ret != GNUTLS_E_SUCCESS){

690

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

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

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

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

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

726

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

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

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

733

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

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

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

741

mc->dh_bits);

742

}

743

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

744

if(ret != GNUTLS_E_SUCCESS){

745

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

746

" bits): %s\n", mc->dh_bits,

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

751

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

536

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

537

if(ret != GNUTLS_E_SUCCESS){

538

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

539

safer_gnutls_strerror(ret));

540

goto globalfail;

541

}

542

543

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

752

544

753

545

return 0;

754

546

755

547

globalfail:

756

548

757

gnutls_certificate_free_credentials(mc->cred);

549

gnutls_certificate_free_credentials(mc.cred);

758

550

gnutls_global_deinit();

759

gnutls_dh_params_deinit(mc->dh_params);

551

gnutls_dh_params_deinit(mc.dh_params);

760

552

return -1;

761

553

}

762

554

763

__attribute__((nonnull, warn_unused_result))

764

static int init_gnutls_session(gnutls_session_t *session,

765

mandos_context *mc){

555

static int init_gnutls_session(gnutls_session_t *session){

766

556

int ret;

767

557

/* GnuTLS session creation */

768

558

do {

780

570

{

781

571

const char *err;

782

572

do {

783

ret = gnutls_priority_set_direct(*session, mc->priority, &err);

573

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

784

574

if(quit_now){

785

575

gnutls_deinit(*session);

786

576

return -1;

797

587

798

588

do {

799

589

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

800

mc->cred);

590

mc.cred);

801

591

if(quit_now){

802

592

gnutls_deinit(*session);

803

593

return -1;

813

603

/* ignore client certificate if any. */

814

604

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

815

605

606

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

607

816

608

return 0;

817

609

}

818

610

820

612

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

821

613

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

822

614

823

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

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

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

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

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

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

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

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

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

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

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

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

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

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

875

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

876

__attribute__((nonnull, warn_unused_result))

877

static bool add_delete_local_route(const bool add,

878

const char *address,

879

AvahiIfIndex if_index){

880

int ret;

881

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

882

char add_arg[] = "add";

883

char delete_arg[] = "delete";

884

char debug_flag[] = "--debug";

885

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

886

if(pluginhelperdir == NULL){

887

if(debug){

888

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

889

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

890

}

891

return false;

892

}

893

894

char interface[IF_NAMESIZE];

895

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

896

perror_plus("if_indextoname");

897

return false;

898

}

899

900

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

901

if(devnull == -1){

902

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

903

return false;

904

}

905

pid_t pid = fork();

906

if(pid == 0){

907

/* Child */

908

/* Raise privileges */

909

errno = raise_privileges_permanently();

910

if(errno != 0){

911

perror_plus("Failed to raise privileges");

912

/* _exit(EX_NOPERM); */

913

} else {

914

/* Set group */

915

errno = 0;

916

ret = setgid(0);

917

if(ret == -1){

918

perror_plus("setgid");

919

_exit(EX_NOPERM);

920

}

921

/* Reset supplementary groups */

922

errno = 0;

923

ret = setgroups(0, NULL);

924

if(ret == -1){

925

perror_plus("setgroups");

926

_exit(EX_NOPERM);

927

}

928

}

929

ret = dup2(devnull, STDIN_FILENO);

930

if(ret == -1){

931

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

932

_exit(EX_OSERR);

933

}

934

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

935

if(ret == -1){

936

perror_plus("close");

937

_exit(EX_OSERR);

938

}

939

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

940

if(ret == -1){

941

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

942

_exit(EX_OSERR);

943

}

944

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

945

O_RDONLY

946

| O_DIRECTORY

947

| O_PATH

948

| O_CLOEXEC));

949

if(helperdir_fd == -1){

950

perror_plus("open");

951

_exit(EX_UNAVAILABLE);

952

}

953

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

954

helper, O_RDONLY));

955

if(helper_fd == -1){

956

perror_plus("openat");

957

_exit(EX_UNAVAILABLE);

958

}

959

TEMP_FAILURE_RETRY(close(helperdir_fd));

960

#ifdef __GNUC__

961

#pragma GCC diagnostic push

962

#pragma GCC diagnostic ignored "-Wcast-qual"

963

#endif

964

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

965

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

966

interface, debug ? debug_flag : NULL, NULL },

967

environ) == -1){

968

#ifdef __GNUC__

969

#pragma GCC diagnostic pop

970

#endif

971

perror_plus("fexecve");

972

_exit(EXIT_FAILURE);

973

}

974

}

975

if(pid == -1){

976

perror_plus("fork");

977

return false;

978

}

979

int status;

980

pid_t pret = -1;

981

errno = 0;

982

do {

983

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

984

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

985

int errno_raising = 0;

986

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

987

errno_raising = errno;

988

perror_plus("Failed to raise privileges in order to"

989

" kill helper program");

990

}

991

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

992

perror_plus("kill");

993

}

994

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

995

perror_plus("Failed to lower privileges after killing"

996

" helper program");

997

}

998

return false;

999

}

1000

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

1001

if(pret == -1){

1002

perror_plus("waitpid");

1003

return false;

1004

}

1005

if(WIFEXITED(status)){

1006

if(WEXITSTATUS(status) != 0){

1007

fprintf_plus(stderr, "Error: iprouteadddel exited"

1008

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

1009

return false;

1010

}

1011

return true;

1012

}

1013

if(WIFSIGNALED(status)){

1014

fprintf_plus(stderr, "Error: iprouteadddel died by"

1015

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

1016

return false;

1017

}

1018

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

1019

return false;

1020

}

1021

1022

__attribute__((nonnull, warn_unused_result))

1023

static bool add_local_route(const char *address,

1024

AvahiIfIndex if_index){

1025

if(debug){

1026

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

1027

}

1028

return add_delete_local_route(true, address, if_index);

1029

}

1030

1031

__attribute__((nonnull, warn_unused_result))

1032

static bool delete_local_route(const char *address,

1033

AvahiIfIndex if_index){

1034

if(debug){

1035

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

1036

}

1037

return add_delete_local_route(false, address, if_index);

1038

}

1039

1040

615

/* Called when a Mandos server is found */

1041

__attribute__((nonnull, warn_unused_result))

1042

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

616

static int start_mandos_communication(const char *ip, uint16_t port,

1043

617

AvahiIfIndex if_index,

1044

int af, mandos_context *mc){

618

int af){

1045

619

int ret, tcp_sd = -1;

1046

620

ssize_t sret;

1047

struct sockaddr_storage to;

621

union {

622

struct sockaddr_in in;

623

struct sockaddr_in6 in6;

624

} to;

1048

625

char *buffer = NULL;

1049

626

char *decrypted_buffer = NULL;

1050

627

size_t buffer_length = 0;

1053

630

int retval = -1;

1054

631

gnutls_session_t session;

1055

632

int pf; /* Protocol family */

1056

bool route_added = false;

1057

633

1058

634

errno = 0;

1059

635

1075

651

return -1;

1076

652

}

1077

653

1078

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

1079

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

1080

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

1081

bool match = false;

1082

{

1083

char *interface = NULL;

1084

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

1085

interface))){

1086

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

1087

match = true;

1088

break;

1089

}

1090

}

1091

}

1092

if(not match){

1093

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

1094

connect to the server */

1095

if(debug){

1096

char interface[IF_NAMESIZE];

1097

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

1098

perror_plus("if_indextoname");

1099

} else {

1100

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

1101

" \"%s\"\n",

1102

if_indextoname((unsigned int)if_index,

1103

interface));

1104

}

1105

}

1106

return -1;

1107

}

1108

}

1109

1110

ret = init_gnutls_session(&session, mc);

654

ret = init_gnutls_session(&session);

1111

655

if(ret != 0){

1112

656

return -1;

1113

657

}

1114

658

1115

659

if(debug){

1116

660

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

1117

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

661

PRIu16 "\n", ip, port);

1118

662

}

1119

663

1120

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

664

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

665

if(tcp_sd < 0){

1122

666

int e = errno;

1123

667

perror_plus("socket");

1132

676

1133

677

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

1134

678

if(af == AF_INET6){

1135

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

1136

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

679

to.in6.sin6_family = (sa_family_t)af;

680

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

1137

681

} else { /* IPv4 */

1138

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

1139

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

682

to.in.sin_family = (sa_family_t)af;

683

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

1140

684

}

1141

685

if(ret < 0 ){

1142

686

int e = errno;

1151

695

goto mandos_end;

1152

696

}

1153

697

if(af == AF_INET6){

1154

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

1155

if(IN6_IS_ADDR_LINKLOCAL

1156

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

698

to.in6.sin6_port = htons(port); /* Spurious warnings from

699

-Wconversion and

700

-Wunreachable-code */

701

702

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

703

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

704

-Wunreachable-code*/

1157

705

if(if_index == AVAHI_IF_UNSPEC){

1158

706

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

1159

707

" incomplete without a network interface\n");

1161

709

goto mandos_end;

1162

710

}

1163

711

/* Set the network interface number as scope */

1164

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

712

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

713

}

1166

714

} else {

1167

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

715

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

716

-Wconversion and

717

-Wunreachable-code */

1168

718

}

1169

719

1170

720

if(quit_now){

1178

728

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

1179

729

perror_plus("if_indextoname");

1180

730

} else {

1181

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

1182

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

731

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

732

"\n", ip, interface, port);

1183

733

}

1184

734

} else {

1185

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

1186

ip, (uintmax_t)port);

735

fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",

736

ip, port);

1187

737

}

1188

738

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1189

739

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1190

if(af == AF_INET6){

1191

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

1192

sizeof(struct sockaddr_in6),

1193

addrstr, sizeof(addrstr), NULL, 0,

1194

NI_NUMERICHOST);

1195

} else {

1196

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

1197

sizeof(struct sockaddr_in),

1198

addrstr, sizeof(addrstr), NULL, 0,

1199

NI_NUMERICHOST);

1200

}

1201

if(ret == EAI_SYSTEM){

1202

perror_plus("getnameinfo");

1203

} else if(ret != 0) {

1204

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

1205

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

1206

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

1207

}

1208

}

1209

1210

if(quit_now){

1211

errno = EINTR;

1212

goto mandos_end;

1213

}

1214

1215

while(true){

1216

if(af == AF_INET6){

1217

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

1218

sizeof(struct sockaddr_in6));

1219

} else {

1220

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

1221

sizeof(struct sockaddr_in));

1222

}

1223

if(ret < 0){

1224

if(errno == ENETUNREACH

1225

and if_index != AVAHI_IF_UNSPEC

1226

and connect_to == NULL

1227

and not route_added and

1228

((af == AF_INET6 and not

1229

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1230

&to)->sin6_addr)))

1231

or (af == AF_INET and

1232

/* Not a a IPv4LL address */

1233

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

1234

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

1235

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

1236

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

1237

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

1238

connect to a Mandos server announced by Avahi on a server

1239

host with a global address. Work around this by retrying

1240

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

1241

1242

Avahi bug reference:

1243

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

1244

https://bugs.debian.org/587961

1245

*/

1246

if(debug){

1247

fprintf_plus(stderr, "Mandos server unreachable, trying"

1248

" direct route\n");

1249

}

1250

int e = errno;

1251

route_added = add_local_route(ip, if_index);

1252

if(route_added){

1253

continue;

1254

}

1255

errno = e;

1256

}

1257

if(errno != ECONNREFUSED or debug){

1258

int e = errno;

1259

perror_plus("connect");

1260

errno = e;

1261

}

1262

goto mandos_end;

1263

}

1264

1265

if(quit_now){

1266

errno = EINTR;

1267

goto mandos_end;

1268

}

1269

break;

740

const char *pcret;

741

if(af == AF_INET6){

742

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

743

sizeof(addrstr));

744

} else {

745

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

746

sizeof(addrstr));

747

}

748

if(pcret == NULL){

749

perror_plus("inet_ntop");

750

} else {

751

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

752

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

753

}

754

}

755

}

756

757

if(quit_now){

758

errno = EINTR;

759

goto mandos_end;

760

}

761

762

if(af == AF_INET6){

763

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

764

} else {

765

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

766

}

767

if(ret < 0){

768

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

769

int e = errno;

770

perror_plus("connect");

771

errno = e;

772

}

773

goto mandos_end;

774

}

775

776

if(quit_now){

777

errno = EINTR;

778

goto mandos_end;

1270

779

}

1271

780

1272

781

const char *out = mandos_protocol_version;

1308

817

goto mandos_end;

1309

818

}

1310

819

1311

/* This casting via intptr_t is to eliminate warning about casting

1312

an int to a pointer type. This is exactly how the GnuTLS Guile

1313

function "set-session-transport-fd!" does it. */

1314

gnutls_transport_set_ptr(session,

1315

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

820

/* Spurious warning from -Wint-to-pointer-cast */

821

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1316

822

1317

823

if(quit_now){

1318

824

errno = EINTR;

1423

929

if(buffer_length > 0){

1424

930

ssize_t decrypted_buffer_size;

1425

931

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1426

&decrypted_buffer, mc);

932

&decrypted_buffer);

1427

933

if(decrypted_buffer_size >= 0){

1428

934

1429

935

written = 0;

1455

961

1456

962

mandos_end:

1457

963

{

1458

if(route_added){

1459

if(not delete_local_route(ip, if_index)){

1460

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

1461

" interface %d", ip, if_index);

1462

}

1463

}

1464

964

int e = errno;

1465

965

free(decrypted_buffer);

1466

966

free(buffer);

1483

983

return retval;

1484

984

}

1485

985

1486

__attribute__((nonnull))

1487

986

static void resolve_callback(AvahiSServiceResolver *r,

1488

987

AvahiIfIndex interface,

1489

988

AvahiProtocol proto,

1497

996

AVAHI_GCC_UNUSED AvahiStringList *txt,

1498

997

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1499

998

flags,

1500

void *mc){

1501

if(r == NULL){

1502

return;

1503

}

999

AVAHI_GCC_UNUSED void* userdata){

1000

assert(r);

1504

1001

1505

1002

/* Called whenever a service has been resolved successfully or

1506

1003

timed out */

1507

1004

1508

1005

if(quit_now){

1509

avahi_s_service_resolver_free(r);

1510

1006

return;

1511

1007

}

1512

1008

1516

1012

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1517

1013

"'%s' of type '%s' in domain '%s': %s\n", name, type,

1518

1014

domain,

1519

avahi_strerror(avahi_server_errno

1520

(((mandos_context*)mc)->server)));

1015

avahi_strerror(avahi_server_errno(mc.server)));

1521

1016

break;

1522

1017

1523

1018

case AVAHI_RESOLVER_FOUND:

1529

1024

PRIdMAX ") on port %" PRIu16 "\n", name,

1530

1025

host_name, ip, (intmax_t)interface, port);

1531

1026

}

1532

int ret = start_mandos_communication(ip, (in_port_t)port,

1533

interface,

1534

avahi_proto_to_af(proto),

1535

mc);

1027

int ret = start_mandos_communication(ip, port, interface,

1028

avahi_proto_to_af(proto));

1536

1029

if(ret == 0){

1537

avahi_simple_poll_quit(simple_poll);

1030

avahi_simple_poll_quit(mc.simple_poll);

1538

1031

} else {

1539

if(not add_server(ip, (in_port_t)port, interface,

1540

avahi_proto_to_af(proto),

1541

&((mandos_context*)mc)->current_server)){

1542

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1543

" list\n", name);

1544

}

1032

ret = add_server(ip, port, interface,

1033

avahi_proto_to_af(proto));

1545

1034

}

1546

1035

}

1547

1036

}

1557

1046

const char *domain,

1558

1047

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1559

1048

flags,

1560

void *mc){

1561

if(b == NULL){

1562

return;

1563

}

1049

AVAHI_GCC_UNUSED void* userdata){

1050

assert(b);

1564

1051

1565

1052

/* Called whenever a new services becomes available on the LAN or

1566

1053

is removed from the LAN */

1574

1061

case AVAHI_BROWSER_FAILURE:

1575

1062

1576

1063

fprintf_plus(stderr, "(Avahi browser) %s\n",

1577

avahi_strerror(avahi_server_errno

1578

(((mandos_context*)mc)->server)));

1579

avahi_simple_poll_quit(simple_poll);

1064

avahi_strerror(avahi_server_errno(mc.server)));

1065

avahi_simple_poll_quit(mc.simple_poll);

1580

1066

return;

1581

1067

1582

1068

case AVAHI_BROWSER_NEW:

1585

1071

the callback function is called the Avahi server will free the

1586

1072

resolver for us. */

1587

1073

1588

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1589

interface, protocol, name, type,

1590

domain, protocol, 0,

1591

resolve_callback, mc) == NULL)

1074

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1075

name, type, domain, protocol, 0,

1076

resolve_callback, NULL) == NULL)

1592

1077

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1593

1078

" %s\n", name,

1594

avahi_strerror(avahi_server_errno

1595

(((mandos_context*)mc)->server)));

1079

avahi_strerror(avahi_server_errno(mc.server)));

1596

1080

break;

1597

1081

1598

1082

case AVAHI_BROWSER_REMOVE:

1617

1101

signal_received = sig;

1618

1102

int old_errno = errno;

1619

1103

/* set main loop to exit */

1620

if(simple_poll != NULL){

1621

avahi_simple_poll_quit(simple_poll);

1104

if(mc.simple_poll != NULL){

1105

avahi_simple_poll_quit(mc.simple_poll);

1622

1106

}

1623

1107

errno = old_errno;

1624

1108

}

1625

1109

1626

__attribute__((nonnull, warn_unused_result))

1627

1110

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

1628

1111

int ret;

1629

error_t ret_errno;

1630

1112

1631

1113

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

1632

1114

if(s < 0){

1633

ret_errno = errno;

1634

1115

perror_plus("socket");

1635

errno = ret_errno;

1636

1116

return false;

1637

1117

}

1638

1118

strcpy(ifr->ifr_name, ifname);

1639

1119

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1640

1120

if(ret == -1){

1641

1121

if(debug){

1642

ret_errno = errno;

1643

1122

perror_plus("ioctl SIOCGIFFLAGS");

1644

errno = ret_errno;

1645

1123

}

1646

1124

return false;

1647

1125

}

1648

1126

return true;

1649

1127

}

1650

1128

1651

__attribute__((nonnull, warn_unused_result))

1652

1129

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

1653

1130

1654

1131

/* Reject the loopback device */

1696

1173

* corresponds to an acceptable network device.

1697

1174

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

1698

1175

*/

1699

__attribute__((nonnull, warn_unused_result))

1700

1176

int good_interface(const struct dirent *if_entry){

1701

1177

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

1702

1178

return 0;

1718

1194

}

1719

1195

1720

1196

/*

1721

* This function determines if a network interface is up.

1722

*/

1723

__attribute__((nonnull, warn_unused_result))

1724

bool interface_is_up(const char *interface){

1725

struct ifreq ifr;

1726

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

1727

if(debug){

1728

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

1729

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

1730

}

1731

return false;

1732

}

1733

1734

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

1735

}

1736

1737

/*

1738

* This function determines if a network interface is running

1739

*/

1740

__attribute__((nonnull, warn_unused_result))

1741

bool interface_is_running(const char *interface){

1742

struct ifreq ifr;

1743

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

1744

if(debug){

1745

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

1746

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

1747

}

1748

return false;

1749

}

1750

1751

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

1752

}

1753

1754

__attribute__((nonnull, pure, warn_unused_result))

1197

* This function determines if a directory entry in /sys/class/net

1198

* corresponds to an acceptable network device which is up.

1199

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

1200

*/

1201

int up_interface(const struct dirent *if_entry){

1202

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

1203

return 0;

1204

}

1205

1206

struct ifreq ifr;

1207

if(not get_flags(if_entry->d_name, &ifr)){

1208

if(debug){

1209

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

1210

"\"%s\"\n", if_entry->d_name);

1211

}

1212

return 0;

1213

}

1214

1215

/* Reject down interfaces */

1216

if(not (ifr.ifr_flags & IFF_UP)){

1217

if(debug){

1218

fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",

1219

if_entry->d_name);

1220

}

1221

return 0;

1222

}

1223

1224

/* Reject non-running interfaces */

1225

if(not (ifr.ifr_flags & IFF_RUNNING)){

1226

if(debug){

1227

fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",

1228

if_entry->d_name);

1229

}

1230

return 0;

1231

}

1232

1233

if(not good_flags(if_entry->d_name, &ifr)){

1234

return 0;

1235

}

1236

return 1;

1237

}

1238

1755

1239

int notdotentries(const struct dirent *direntry){

1756

1240

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

1757

1241

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

1764

1248

}

1765

1249

1766

1250

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

1767

__attribute__((nonnull, warn_unused_result))

1768

1251

int runnable_hook(const struct dirent *direntry){

1769

1252

int ret;

1770

1253

size_t sret;

1778

1261

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

1779

1262

"abcdefghijklmnopqrstuvwxyz"

1780

1263

"0123456789"

1781

"_.-");

1264

"_-");

1782

1265

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

1783

1266

/* Contains non-allowed characters */

1784

1267

if(debug){

1788

1271

return 0;

1789

1272

}

1790

1273

1791

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

1274

char *fullname = NULL;

1275

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

1276

if(ret < 0){

1277

perror_plus("asprintf");

1278

return 0;

1279

}

1280

1281

ret = stat(fullname, &st);

1792

1282

if(ret == -1){

1793

1283

if(debug){

1794

1284

perror_plus("Could not stat hook");

1818

1308

return 1;

1819

1309

}

1820

1310

1821

__attribute__((nonnull, warn_unused_result))

1822

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1823

mandos_context *mc){

1311

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1824

1312

int ret;

1825

1313

struct timespec now;

1826

1314

struct timespec waited_time;

1827

1315

intmax_t block_time;

1828

1316

1829

1317

while(true){

1830

if(mc->current_server == NULL){

1831

if(debug){

1318

if(mc.current_server == NULL){

1319

if (debug){

1832

1320

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

1833

1321

" No timeout!\n");

1834

1322

}

1835

1323

ret = avahi_simple_poll_iterate(s, -1);

1836

1324

} else {

1837

if(debug){

1325

if (debug){

1838

1326

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

1839

1327

" it, or wait\n");

1840

1328

}

1847

1335

/* Calculating in ms how long time between now and server

1848

1336

who we visted longest time ago. Now - last seen. */

1849

1337

waited_time.tv_sec = (now.tv_sec

1850

- mc->current_server->last_seen.tv_sec);

1338

- mc.current_server->last_seen.tv_sec);

1851

1339

waited_time.tv_nsec = (now.tv_nsec

1852

- mc->current_server->last_seen.tv_nsec);

1340

- mc.current_server->last_seen.tv_nsec);

1853

1341

/* total time is 10s/10,000ms.

1854

1342

Converting to s from ms by dividing by 1,000,

1855

1343

and ns to ms by dividing by 1,000,000. */

1857

1345

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

1858

1346

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

1859

1347

1860

if(debug){

1348

if (debug){

1861

1349

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

1862

1350

block_time);

1863

1351

}

1864

1352

1865

1353

if(block_time <= 0){

1866

ret = start_mandos_communication(mc->current_server->ip,

1867

mc->current_server->port,

1868

mc->current_server->if_index,

1869

mc->current_server->af, mc);

1354

ret = start_mandos_communication(mc.current_server->ip,

1355

mc.current_server->port,

1356

mc.current_server->if_index,

1357

mc.current_server->af);

1870

1358

if(ret == 0){

1871

avahi_simple_poll_quit(s);

1359

avahi_simple_poll_quit(mc.simple_poll);

1872

1360

return 0;

1873

1361

}

1874

1362

ret = clock_gettime(CLOCK_MONOTONIC,

1875

&mc->current_server->last_seen);

1363

&mc.current_server->last_seen);

1876

1364

if(ret == -1){

1877

1365

perror_plus("clock_gettime");

1878

1366

return -1;

1879

1367

}

1880

mc->current_server = mc->current_server->next;

1368

mc.current_server = mc.current_server->next;

1881

1369

block_time = 0; /* Call avahi to find new Mandos

1882

1370

servers, but don't block */

1883

1371

}

1885

1373

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

1886

1374

}

1887

1375

if(ret != 0){

1888

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

1376

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

1889

1377

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

1890

1378

}

1891

1379

}

1892

1380

}

1893

1381

}

1894

1382

1895

__attribute__((nonnull))

1896

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

1383

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

1897

1384

const float delay){

1898

struct dirent **direntries = NULL;

1899

if(hookdir_fd == -1){

1900

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1901

| O_CLOEXEC);

1902

if(hookdir_fd == -1){

1903

if(errno == ENOENT){

1904

if(debug){

1905

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

1906

" found\n", hookdir);

1907

}

1908

} else {

1909

perror_plus("open");

1910

}

1911

return;

1912

}

1913

}

1914

#ifdef __GLIBC__

1915

#if __GLIBC_PREREQ(2, 15)

1916

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

1917

runnable_hook, alphasort);

1918

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

1919

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

1920

alphasort);

1921

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

1922

#else /* not __GLIBC__ */

1923

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

1924

alphasort);

1925

#endif /* not __GLIBC__ */

1385

struct dirent **direntries;

1386

struct dirent *direntry;

1387

int ret;

1388

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

1389

alphasort);

1926

1390

if(numhooks == -1){

1927

1391

perror_plus("scandir");

1928

return;

1929

}

1930

struct dirent *direntry;

1931

int ret;

1932

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

1933

if(devnull == -1){

1934

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

1935

return;

1936

}

1937

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

1938

direntry = direntries[i];

1939

if(debug){

1940

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

1941

direntry->d_name);

1942

}

1943

pid_t hook_pid = fork();

1944

if(hook_pid == 0){

1945

/* Child */

1946

/* Raise privileges */

1947

errno = raise_privileges_permanently();

1948

if(errno != 0){

1949

perror_plus("Failed to raise privileges");

1950

_exit(EX_NOPERM);

1951

}

1952

/* Set group */

1953

errno = 0;

1954

ret = setgid(0);

1955

if(ret == -1){

1956

perror_plus("setgid");

1957

_exit(EX_NOPERM);

1958

}

1959

/* Reset supplementary groups */

1960

errno = 0;

1961

ret = setgroups(0, NULL);

1962

if(ret == -1){

1963

perror_plus("setgroups");

1964

_exit(EX_NOPERM);

1965

}

1966

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

1967

if(ret == -1){

1968

perror_plus("setenv");

1969

_exit(EX_OSERR);

1970

}

1971

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

1972

if(ret == -1){

1973

perror_plus("setenv");

1974

_exit(EX_OSERR);

1975

}

1976

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

1977

if(ret == -1){

1978

perror_plus("setenv");

1979

_exit(EX_OSERR);

1980

}

1981

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

1982

if(ret == -1){

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

char *delaystring;

1987

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

1988

if(ret == -1){

1392

} else {

1393

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

1394

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

1395

direntry = direntries[i];

1396

char *fullname = NULL;

1397

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

1398

if(ret < 0){

1989

1399

perror_plus("asprintf");

1990

_exit(EX_OSERR);

1991

}

1992

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

1993

if(ret == -1){

1400

continue;

1401

}

1402

if(debug){

1403

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

1404

direntry->d_name);

1405

}

1406

pid_t hook_pid = fork();

1407

if(hook_pid == 0){

1408

/* Child */

1409

dup2(devnull, STDIN_FILENO);

1410

close(devnull);

1411

dup2(STDERR_FILENO, STDOUT_FILENO);

1412

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

1413

if(ret == -1){

1414

perror_plus("setenv");

1415

return false;

1416

}

1417

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

1418

if(ret == -1){

1419

perror_plus("setenv");

1420

return false;

1421

}

1422

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

1423

if(ret == -1){

1424

perror_plus("setenv");

1425

return false;

1426

}

1427

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

1428

if(ret == -1){

1429

perror_plus("setenv");

1430

return false;

1431

}

1432

char *delaystring;

1433

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

1434

if(ret == -1){

1435

perror_plus("asprintf");

1436

return false;

1437

}

1438

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

1439

if(ret == -1){

1440

free(delaystring);

1441

perror_plus("setenv");

1442

return false;

1443

}

1994

1444

free(delaystring);

1995

perror_plus("setenv");

1996

_exit(EX_OSERR);

1997

}

1998

free(delaystring);

1999

if(connect_to != NULL){

2000

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

2001

if(ret == -1){

2002

perror_plus("setenv");

2003

_exit(EX_OSERR);

2004

}

2005

}

2006

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

2007

direntry->d_name,

2008

O_RDONLY));

2009

if(hook_fd == -1){

2010

perror_plus("openat");

2011

_exit(EXIT_FAILURE);

2012

}

2013

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

2014

perror_plus("close");

2015

_exit(EXIT_FAILURE);

2016

}

2017

ret = dup2(devnull, STDIN_FILENO);

2018

if(ret == -1){

2019

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

2020

_exit(EX_OSERR);

2021

}

2022

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

2023

if(ret == -1){

2024

perror_plus("close");

2025

_exit(EX_OSERR);

2026

}

2027

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2028

if(ret == -1){

2029

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

2030

_exit(EX_OSERR);

2031

}

2032

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

2033

environ) == -1){

2034

perror_plus("fexecve");

2035

_exit(EXIT_FAILURE);

2036

}

2037

} else {

2038

if(hook_pid == -1){

2039

perror_plus("fork");

2040

free(direntry);

2041

continue;

2042

}

2043

int status;

2044

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

2045

perror_plus("waitpid");

2046

free(direntry);

2047

continue;

2048

}

2049

if(WIFEXITED(status)){

2050

if(WEXITSTATUS(status) != 0){

2051

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

2052

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

2053

WEXITSTATUS(status));

2054

free(direntry);

2055

continue;

2056

}

2057

} else if(WIFSIGNALED(status)){

2058

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

2059

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

2060

WTERMSIG(status));

2061

free(direntry);

2062

continue;

2063

} else {

2064

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

2065

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

2066

free(direntry);

2067

continue;

2068

}

2069

}

2070

if(debug){

2071

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

2072

direntry->d_name);

2073

}

2074

free(direntry);

2075

}

2076

free(direntries);

2077

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

2078

perror_plus("close");

2079

} else {

2080

hookdir_fd = -1;

2081

}

2082

close(devnull);

2083

}

2084

2085

__attribute__((nonnull, warn_unused_result))

2086

error_t bring_up_interface(const char *const interface,

2087

const float delay){

2088

error_t old_errno = errno;

2089

int ret;

2090

struct ifreq network;

2091

unsigned int if_index = if_nametoindex(interface);

2092

if(if_index == 0){

2093

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

2094

errno = old_errno;

2095

return ENXIO;

2096

}

2097

2098

if(quit_now){

2099

errno = old_errno;

2100

return EINTR;

2101

}

2102

2103

if(not interface_is_up(interface)){

2104

error_t ret_errno = 0, ioctl_errno = 0;

2105

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

2106

ret_errno = errno;

2107

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

2108

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

2109

errno = old_errno;

2110

return ret_errno;

2111

}

2112

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

2113

2114

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

2115

if(sd == -1){

2116

ret_errno = errno;

2117

perror_plus("socket");

2118

errno = old_errno;

2119

return ret_errno;

2120

}

2121

2122

if(quit_now){

2123

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

2124

if(ret == -1){

2125

perror_plus("close");

2126

}

2127

errno = old_errno;

2128

return EINTR;

2129

}

2130

2131

if(debug){

2132

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

2133

interface);

2134

}

2135

2136

/* Raise privileges */

2137

ret_errno = raise_privileges();

2138

if(ret_errno != 0){

2139

errno = ret_errno;

2140

perror_plus("Failed to raise privileges");

2141

}

2142

2143

#ifdef __linux__

2144

int ret_linux;

2145

bool restore_loglevel = false;

2146

if(ret_errno == 0){

2147

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2148

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

2149

ret_linux = klogctl(8, NULL, 5);

2150

if(ret_linux == -1){

2151

perror_plus("klogctl");

2152

} else {

2153

restore_loglevel = true;

2154

}

2155

}

2156

#endif /* __linux__ */

2157

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

2158

ioctl_errno = errno;

2159

#ifdef __linux__

2160

if(restore_loglevel){

2161

ret_linux = klogctl(7, NULL, 0);

2162

if(ret_linux == -1){

2163

perror_plus("klogctl");

2164

}

2165

}

2166

#endif /* __linux__ */

2167

2168

/* If raise_privileges() succeeded above */

2169

if(ret_errno == 0){

2170

/* Lower privileges */

2171

ret_errno = lower_privileges();

2172

if(ret_errno != 0){

2173

errno = ret_errno;

2174

perror_plus("Failed to lower privileges");

2175

}

2176

}

2177

2178

/* Close the socket */

2179

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

2180

if(ret == -1){

2181

perror_plus("close");

2182

}

2183

2184

if(ret_setflags == -1){

2185

errno = ioctl_errno;

2186

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2187

errno = old_errno;

2188

return ioctl_errno;

2189

}

2190

} else if(debug){

2191

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

2192

interface);

2193

}

2194

2195

/* Sleep checking until interface is running.

2196

Check every 0.25s, up to total time of delay */

2197

for(int i=0; i < delay * 4; i++){

2198

if(interface_is_running(interface)){

2199

break;

2200

}

2201

struct timespec sleeptime = { .tv_nsec = 250000000 };

2202

ret = nanosleep(&sleeptime, NULL);

2203

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

2204

perror_plus("nanosleep");

2205

}

2206

}

2207

2208

errno = old_errno;

2209

return 0;

2210

}

2211

2212

__attribute__((nonnull, warn_unused_result))

2213

error_t take_down_interface(const char *const interface){

2214

error_t old_errno = errno;

2215

struct ifreq network;

2216

unsigned int if_index = if_nametoindex(interface);

2217

if(if_index == 0){

2218

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

2219

errno = old_errno;

2220

return ENXIO;

2221

}

2222

if(interface_is_up(interface)){

2223

error_t ret_errno = 0, ioctl_errno = 0;

2224

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

2225

ret_errno = errno;

2226

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

2227

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

2228

errno = old_errno;

2229

return ret_errno;

2230

}

2231

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

2232

2233

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

2234

if(sd == -1){

2235

ret_errno = errno;

2236

perror_plus("socket");

2237

errno = old_errno;

2238

return ret_errno;

2239

}

2240

2241

if(debug){

2242

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

2243

interface);

2244

}

2245

2246

/* Raise privileges */

2247

ret_errno = raise_privileges();

2248

if(ret_errno != 0){

2249

errno = ret_errno;

2250

perror_plus("Failed to raise privileges");

2251

}

2252

2253

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

2254

ioctl_errno = errno;

2255

2256

/* If raise_privileges() succeeded above */

2257

if(ret_errno == 0){

2258

/* Lower privileges */

2259

ret_errno = lower_privileges();

2260

if(ret_errno != 0){

2261

errno = ret_errno;

2262

perror_plus("Failed to lower privileges");

2263

}

2264

}

2265

2266

/* Close the socket */

2267

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

2268

if(ret == -1){

2269

perror_plus("close");

2270

}

2271

2272

if(ret_setflags == -1){

2273

errno = ioctl_errno;

2274

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2275

errno = old_errno;

2276

return ioctl_errno;

2277

}

2278

} else if(debug){

2279

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

2280

interface);

2281

}

2282

2283

errno = old_errno;

2284

return 0;

1445

ret = execl(fullname, direntry->d_name, mode, NULL);

1446

perror_plus("execl");

1447

} else {

1448

int status;

1449

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

1450

perror_plus("waitpid");

1451

free(fullname);

1452

continue;

1453

}

1454

if(WIFEXITED(status)){

1455

if(WEXITSTATUS(status) != 0){

1456

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

1457

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

1458

WEXITSTATUS(status));

1459

free(fullname);

1460

continue;

1461

}

1462

} else if(WIFSIGNALED(status)){

1463

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

1464

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

1465

WTERMSIG(status));

1466

free(fullname);

1467

continue;

1468

} else {

1469

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

1470

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

1471

free(fullname);

1472

continue;

1473

}

1474

}

1475

free(fullname);

1476

if(debug){

1477

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

1478

direntry->d_name);

1479

}

1480

}

1481

close(devnull);

1482

}

1483

return true;

2285

1484

}

2286

1485

2287

1486

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

2288

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

2289

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

2290

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

2291

.interfaces = NULL, .interfaces_size = 0 };

2292

1487

AvahiSServiceBrowser *sb = NULL;

2293

error_t ret_errno;

1488

int error;

2294

1489

int ret;

2295

1490

intmax_t tmpmax;

2296

1491

char *tmp;

2297

1492

int exitcode = EXIT_SUCCESS;

2298

char *interfaces_to_take_down = NULL;

2299

size_t interfaces_to_take_down_size = 0;

2300

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

2301

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

2302

char *tempdir = NULL;

1493

const char *interface = "";

1494

struct ifreq network;

1495

int sd = -1;

1496

bool take_down_interface = false;

1497

uid_t uid;

1498

gid_t gid;

1499

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

1500

bool tempdir_created = false;

2303

1501

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2304

1502

const char *seckey = PATHDIR "/" SECKEY;

2305

1503

const char *pubkey = PATHDIR "/" PUBKEY;

2306

const char *dh_params_file = NULL;

2307

char *interfaces_hooks = NULL;

2308

1504

2309

1505

bool gnutls_initialized = false;

2310

1506

bool gpgme_initialized = false;

2362

1558

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

2363

1559

" Diffie-Hellman key exchange",

2364

1560

.group = 2 },

2365

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

2366

.arg = "FILE",

2367

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

2368

" for the Diffie-Hellman key exchange",

2369

.group = 2 },

2370

1561

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

2371

1562

.arg = "STRING",

2372

1563

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

2377

1568

.group = 2 },

2378

1569

{ .name = "retry", .key = 132,

2379

1570

.arg = "SECONDS",

2380

.doc = "Retry interval used when denied by the Mandos server",

1571

.doc = "Retry interval used when denied by the mandos server",

2381

1572

.group = 2 },

2382

1573

{ .name = "network-hook-dir", .key = 133,

2383

1574

.arg = "DIR",

2406

1597

connect_to = arg;

2407

1598

break;

2408

1599

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

2409

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

2410

arg, (int)',');

2411

if(ret_errno != 0){

2412

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

2413

}

1600

interface = arg;

2414

1601

break;

2415

1602

case 's': /* --seckey */

2416

1603

seckey = arg;

2427

1614

}

2428

1615

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

2429

1616

break;

2430

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

2431

dh_params_file = arg;

2432

break;

2433

1617

case 130: /* --priority */

2434

1618

mc.priority = arg;

2435

1619

break;

2462

1646

argp_state_help(state, state->out_stream,

2463

1647

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2464

1648

case 'V': /* --version */

1649

fprintf_plus(state->out_stream,

1650

"Mandos plugin mandos-client: ");

2465

1651

fprintf_plus(state->out_stream, "%s\n", argp_program_version);

2466

1652

exit(argp_err_exit_status);

2467

1653

break;

2491

1677

goto end;

2492

1678

}

2493

1679

}

2494

2495

{

1680

1681

if(getuid() == 0){

2496

1682

/* Work around Debian bug #633582:

2497

1683

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

2498

2499

/* Re-raise privileges */

2500

ret_errno = raise_privileges();

2501

if(ret_errno != 0){

2502

errno = ret_errno;

2503

perror_plus("Failed to raise privileges");

2504

} else {

2505

struct stat st;

2506

2507

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

2508

int seckey_fd = open(seckey, O_RDONLY);

2509

if(seckey_fd == -1){

2510

perror_plus("open");

2511

} else {

2512

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

2513

if(ret == -1){

2514

perror_plus("fstat");

2515

} else {

2516

if(S_ISREG(st.st_mode)

2517

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

2518

ret = fchown(seckey_fd, uid, gid);

2519

if(ret == -1){

2520

perror_plus("fchown");

2521

}

2522

}

2523

}

2524

TEMP_FAILURE_RETRY(close(seckey_fd));

2525

}

2526

}

2527

2528

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

2529

int pubkey_fd = open(pubkey, O_RDONLY);

2530

if(pubkey_fd == -1){

2531

perror_plus("open");

2532

} else {

2533

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

2534

if(ret == -1){

2535

perror_plus("fstat");

2536

} else {

2537

if(S_ISREG(st.st_mode)

2538

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

2539

ret = fchown(pubkey_fd, uid, gid);

2540

if(ret == -1){

2541

perror_plus("fchown");

2542

}

2543

}

2544

}

2545

TEMP_FAILURE_RETRY(close(pubkey_fd));

2546

}

2547

}

2548

2549

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

2550

int dhparams_fd = open(dh_params_file, O_RDONLY);

2551

if(dhparams_fd == -1){

2552

perror_plus("open");

2553

} else {

2554

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

2555

if(ret == -1){

2556

perror_plus("fstat");

2557

} else {

2558

if(S_ISREG(st.st_mode)

2559

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

2560

ret = fchown(dhparams_fd, uid, gid);

2561

if(ret == -1){

2562

perror_plus("fchown");

2563

}

2564

}

2565

}

2566

TEMP_FAILURE_RETRY(close(dhparams_fd));

2567

}

2568

}

2569

2570

/* Lower privileges */

2571

ret_errno = lower_privileges();

2572

if(ret_errno != 0){

2573

errno = ret_errno;

2574

perror_plus("Failed to lower privileges");

2575

}

2576

}

2577

}

2578

2579

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

2580

{

2581

char *interface = NULL;

2582

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

2583

interface))){

2584

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

2585

and if_nametoindex(interface) == 0){

2586

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

2587

fprintf_plus(stderr, "Not using nonexisting interface"

2588

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

2589

}

2590

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

2591

interface = NULL;

2592

}

1684

struct stat st;

1685

1686

/* Re-raise priviliges */

1687

errno = 0;

1688

ret = seteuid(0);

1689

if(ret == -1){

1690

perror_plus("seteuid");

1691

}

1692

1693

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

1694

int seckey_fd = open(seckey, O_RDONLY);

1695

if(seckey_fd == -1){

1696

perror_plus("open");

1697

} else {

1698

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

1699

if(ret == -1){

1700

perror_plus("fstat");

1701

} else {

1702

if(S_ISREG(st.st_mode)

1703

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

1704

ret = fchown(seckey_fd, uid, gid);

1705

if(ret == -1){

1706

perror_plus("fchown");

1707

}

1708

}

1709

}

1710

TEMP_FAILURE_RETRY(close(seckey_fd));

1711

}

1712

}

1713

1714

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

1715

int pubkey_fd = open(pubkey, O_RDONLY);

1716

if(pubkey_fd == -1){

1717

perror_plus("open");

1718

} else {

1719

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

1720

if(ret == -1){

1721

perror_plus("fstat");

1722

} else {

1723

if(S_ISREG(st.st_mode)

1724

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

1725

ret = fchown(pubkey_fd, uid, gid);

1726

if(ret == -1){

1727

perror_plus("fchown");

1728

}

1729

}

1730

}

1731

TEMP_FAILURE_RETRY(close(pubkey_fd));

1732

}

1733

}

1734

1735

/* Lower privileges */

1736

errno = 0;

1737

ret = seteuid(uid);

1738

if(ret == -1){

1739

perror_plus("seteuid");

2593

1740

}

2594

1741

}

2595

1742

2596

1743

/* Run network hooks */

2597

1744

{

2598

if(mc.interfaces != NULL){

2599

interfaces_hooks = malloc(mc.interfaces_size);

2600

if(interfaces_hooks == NULL){

2601

perror_plus("malloc");

2602

goto end;

2603

}

2604

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

2605

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

2606

}

2607

run_network_hooks("start", interfaces_hooks != NULL ?

2608

interfaces_hooks : "", delay);

1745

if(getuid() == 0){

1746

/* Re-raise priviliges */

1747

errno = 0;

1748

ret = seteuid(0);

1749

if(ret == -1){

1750

perror_plus("seteuid");

1751

}

1752

}

1753

if(not run_network_hooks("start", interface, delay)){

1754

goto end;

1755

}

1756

if(getuid() == 0){

1757

/* Lower privileges */

1758

errno = 0;

1759

ret = seteuid(uid);

1760

if(ret == -1){

1761

perror_plus("seteuid");

1762

}

1763

}

2609

1764

}

2610

1765

2611

1766

if(not debug){

2612

1767

avahi_set_log_function(empty_log);

2613

1768

}

2614

1769

1770

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

1771

struct dirent **direntries;

1772

/* First look for interfaces that are up */

1773

ret = scandir(sys_class_net, &direntries, up_interface,

1774

alphasort);

1775

if(ret == 0){

1776

/* No up interfaces, look for any good interfaces */

1777

free(direntries);

1778

ret = scandir(sys_class_net, &direntries, good_interface,

1779

alphasort);

1780

}

1781

if(ret >= 1){

1782

/* Pick the first interface returned */

1783

interface = strdup(direntries[0]->d_name);

1784

if(debug){

1785

fprintf_plus(stderr, "Using interface \"%s\"\n", interface);

1786

}

1787

if(interface == NULL){

1788

perror_plus("malloc");

1789

free(direntries);

1790

exitcode = EXIT_FAILURE;

1791

goto end;

1792

}

1793

free(direntries);

1794

} else {

1795

free(direntries);

1796

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

1797

exitcode = EXIT_FAILURE;

1798

goto end;

1799

}

1800

}

1801

2615

1802

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

2616

1803

from the signal handler */

2617

1804

/* Initialize the pseudo-RNG for Avahi */

2618

1805

srand((unsigned int) time(NULL));

2619

simple_poll = avahi_simple_poll_new();

2620

if(simple_poll == NULL){

1806

mc.simple_poll = avahi_simple_poll_new();

1807

if(mc.simple_poll == NULL){

2621

1808

fprintf_plus(stderr,

2622

1809

"Avahi: Failed to create simple poll object.\n");

2623

1810

exitcode = EX_UNAVAILABLE;

2687

1874

}

2688

1875

}

2689

1876

2690

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

2691

if(mc.interfaces == NULL){

2692

struct dirent **direntries = NULL;

2693

/* Look for any good interfaces */

2694

ret = scandir(sys_class_net, &direntries, good_interface,

2695

alphasort);

2696

if(ret >= 1){

2697

/* Add all found interfaces to interfaces list */

2698

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

2699

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

2700

direntries[i]->d_name);

2701

if(ret_errno != 0){

2702

errno = ret_errno;

2703

perror_plus("argz_add");

2704

free(direntries[i]);

2705

continue;

2706

}

2707

if(debug){

2708

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

2709

direntries[i]->d_name);

2710

}

2711

free(direntries[i]);

2712

}

2713

free(direntries);

2714

} else {

2715

if(ret == 0){

2716

free(direntries);

2717

}

2718

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

2719

exitcode = EXIT_FAILURE;

2720

goto end;

2721

}

2722

}

2723

2724

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

2725

{

2726

char *interface = NULL;

2727

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

2728

interface))){

2729

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

2730

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

2731

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

2732

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

2733

interface);

2734

interface = NULL;

2735

while((interface = argz_next(mc.interfaces,

2736

mc.interfaces_size, interface))){

2737

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

2738

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

2739

interface);

2740

interface = NULL;

1877

/* If the interface is down, bring it up */

1878

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

1879

if_index = (AvahiIfIndex) if_nametoindex(interface);

1880

if(if_index == 0){

1881

fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);

1882

exitcode = EX_UNAVAILABLE;

1883

goto end;

1884

}

1885

1886

if(quit_now){

1887

goto end;

1888

}

1889

1890

/* Re-raise priviliges */

1891

errno = 0;

1892

ret = seteuid(0);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

1897

#ifdef __linux__

1898

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1899

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

1900

ret = klogctl(8, NULL, 5);

1901

bool restore_loglevel = true;

1902

if(ret == -1){

1903

restore_loglevel = false;

1904

perror_plus("klogctl");

1905

}

1906

#endif /* __linux__ */

1907

1908

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1909

if(sd < 0){

1910

perror_plus("socket");

1911

exitcode = EX_OSERR;

1912

#ifdef __linux__

1913

if(restore_loglevel){

1914

ret = klogctl(7, NULL, 0);

1915

if(ret == -1){

1916

perror_plus("klogctl");

1917

}

1918

}

1919

#endif /* __linux__ */

1920

/* Lower privileges */

1921

errno = 0;

1922

ret = seteuid(uid);

1923

if(ret == -1){

1924

perror_plus("seteuid");

1925

}

1926

goto end;

1927

}

1928

strcpy(network.ifr_name, interface);

1929

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1930

if(ret == -1){

1931

perror_plus("ioctl SIOCGIFFLAGS");

1932

#ifdef __linux__

1933

if(restore_loglevel){

1934

ret = klogctl(7, NULL, 0);

1935

if(ret == -1){

1936

perror_plus("klogctl");

1937

}

1938

}

1939

#endif /* __linux__ */

1940

exitcode = EX_OSERR;

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

if((network.ifr_flags & IFF_UP) == 0){

1950

network.ifr_flags |= IFF_UP;

1951

take_down_interface = true;

1952

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

1953

if(ret == -1){

1954

take_down_interface = false;

1955

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1956

exitcode = EX_OSERR;

1957

#ifdef __linux__

1958

if(restore_loglevel){

1959

ret = klogctl(7, NULL, 0);

1960

if(ret == -1){

1961

perror_plus("klogctl");

2741

1962

}

2742

1963

}

1964

#endif /* __linux__ */

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

}

1974

/* Sleep checking until interface is running.

1975

Check every 0.25s, up to total time of delay */

1976

for(int i=0; i < delay * 4; i++){

1977

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1978

if(ret == -1){

1979

perror_plus("ioctl SIOCGIFFLAGS");

1980

} else if(network.ifr_flags & IFF_RUNNING){

2743

1981

break;

2744

1982

}

2745

bool interface_was_up = interface_is_up(interface);

2746

errno = bring_up_interface(interface, delay);

2747

if(not interface_was_up){

2748

if(errno != 0){

2749

perror_plus("Failed to bring up interface");

2750

} else {

2751

errno = argz_add(&interfaces_to_take_down,

2752

&interfaces_to_take_down_size,

2753

interface);

2754

if(errno != 0){

2755

perror_plus("argz_add");

2756

}

2757

}

2758

}

2759

}

2760

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

2761

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

2762

}

2763

}

2764

2765

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

2766

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

2767

if(debug){

2768

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

2769

mc.interfaces);

2770

}

2771

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

1983

struct timespec sleeptime = { .tv_nsec = 250000000 };

1984

ret = nanosleep(&sleeptime, NULL);

1985

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

1986

perror_plus("nanosleep");

1987

}

1988

}

1989

if(not take_down_interface){

1990

/* We won't need the socket anymore */

1991

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

1992

if(ret == -1){

1993

perror_plus("close");

1994

}

1995

}

1996

#ifdef __linux__

1997

if(restore_loglevel){

1998

/* Restores kernel loglevel to default */

1999

ret = klogctl(7, NULL, 0);

2000

if(ret == -1){

2001

perror_plus("klogctl");

2002

}

2003

}

2004

#endif /* __linux__ */

2005

/* Lower privileges */

2006

errno = 0;

2007

/* Lower privileges */

2008

ret = seteuid(uid);

2009

if(ret == -1){

2010

perror_plus("seteuid");

2011

}

2772

2012

}

2773

2013

2774

2014

if(quit_now){

2775

2015

goto end;

2776

2016

}

2777

2017

2778

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

2018

ret = init_gnutls_global(pubkey, seckey);

2779

2019

if(ret == -1){

2780

2020

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

2781

2021

exitcode = EX_UNAVAILABLE;

2788

2028

goto end;

2789

2029

}

2790

2030

2791

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

2792

tempdir = mkdtemp(run_tempdir);

2793

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

2794

if(debug){

2795

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

2796

run_tempdir, old_tempdir);

2797

}

2798

tempdir = mkdtemp(old_tempdir);

2799

}

2800

if(tempdir == NULL){

2031

if(mkdtemp(tempdir) == NULL){

2801

2032

perror_plus("mkdtemp");

2802

2033

goto end;

2803

2034

}

2035

tempdir_created = true;

2804

2036

2805

2037

if(quit_now){

2806

2038

goto end;

2807

2039

}

2808

2040

2809

if(not init_gpgme(pubkey, seckey, tempdir, &mc)){

2041

if(not init_gpgme(pubkey, seckey, tempdir)){

2810

2042

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

2811

2043

exitcode = EX_UNAVAILABLE;

2812

2044

goto end;

2822

2054

/* Connect directly, do not use Zeroconf */

2823

2055

/* (Mainly meant for debugging) */

2824

2056

char *address = strrchr(connect_to, ':');

2825

2826

2057

if(address == NULL){

2827

2058

fprintf_plus(stderr, "No colon in address\n");

2828

2059

exitcode = EX_USAGE;

2833

2064

goto end;

2834

2065

}

2835

2066

2836

in_port_t port;

2067

uint16_t port;

2837

2068

errno = 0;

2838

2069

tmpmax = strtoimax(address+1, &tmp, 10);

2839

2070

if(errno != 0 or tmp == address+1 or *tmp != '\0'

2840

or tmpmax != (in_port_t)tmpmax){

2071

or tmpmax != (uint16_t)tmpmax){

2841

2072

fprintf_plus(stderr, "Bad port number\n");

2842

2073

exitcode = EX_USAGE;

2843

2074

goto end;

2844

2075

}

2845

2076

2846

2077

if(quit_now){

2847

2078

goto end;

2848

2079

}

2849

2080

2850

port = (in_port_t)tmpmax;

2081

port = (uint16_t)tmpmax;

2851

2082

*address = '\0';

2852

2083

/* Colon in address indicates IPv6 */

2853

2084

int af;

2869

2100

}

2870

2101

2871

2102

while(not quit_now){

2872

ret = start_mandos_communication(address, port, if_index, af,

2873

&mc);

2103

ret = start_mandos_communication(address, port, if_index, af);

2874

2104

if(quit_now or ret == 0){

2875

2105

break;

2876

2106

}

2878

2108

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

2879

2109

(int)retry_interval);

2880

2110

}

2881

sleep((unsigned int)retry_interval);

2111

sleep((int)retry_interval);

2882

2112

}

2883

2113

2884

if(not quit_now){

2114

if (not quit_now){

2885

2115

exitcode = EXIT_SUCCESS;

2886

2116

}

2887

2117

2902

2132

config.publish_domain = 0;

2903

2133

2904

2134

/* Allocate a new server */

2905

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2906

&config, NULL, NULL, &ret_errno);

2135

mc.server = avahi_server_new(avahi_simple_poll_get

2136

(mc.simple_poll), &config, NULL,

2137

NULL, &error);

2907

2138

2908

2139

/* Free the Avahi configuration data */

2909

2140

avahi_server_config_free(&config);

2912

2143

/* Check if creating the Avahi server object succeeded */

2913

2144

if(mc.server == NULL){

2914

2145

fprintf_plus(stderr, "Failed to create Avahi server: %s\n",

2915

avahi_strerror(ret_errno));

2146

avahi_strerror(error));

2916

2147

exitcode = EX_UNAVAILABLE;

2917

2148

goto end;

2918

2149

}

2924

2155

/* Create the Avahi service browser */

2925

2156

sb = avahi_s_service_browser_new(mc.server, if_index,

2926

2157

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2927

NULL, 0, browse_callback,

2928

(void *)&mc);

2158

NULL, 0, browse_callback, NULL);

2929

2159

if(sb == NULL){

2930

2160

fprintf_plus(stderr, "Failed to create service browser: %s\n",

2931

2161

avahi_strerror(avahi_server_errno(mc.server)));

2942

2172

if(debug){

2943

2173

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

2944

2174

}

2945

2946

ret = avahi_loop_with_timeout(simple_poll,

2947

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

2175

2176

ret = avahi_loop_with_timeout(mc.simple_poll,

2177

(int)(retry_interval * 1000));

2948

2178

if(debug){

2949

2179

fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",

2950

2180

(ret == 0) ? "successfully" : "with error");

2957

2187

}

2958

2188

2959

2189

/* Cleanup things */

2960

free(mc.interfaces);

2961

2962

2190

if(sb != NULL)

2963

2191

avahi_s_service_browser_free(sb);

2964

2192

2965

2193

if(mc.server != NULL)

2966

2194

avahi_server_free(mc.server);

2967

2195

2968

if(simple_poll != NULL)

2969

avahi_simple_poll_free(simple_poll);

2196

if(mc.simple_poll != NULL)

2197

avahi_simple_poll_free(mc.simple_poll);

2970

2198

2971

2199

if(gnutls_initialized){

2972

2200

gnutls_certificate_free_credentials(mc.cred);

2984

2212

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

2985

2213

while(mc.current_server != NULL){

2986

2214

server *next = mc.current_server->next;

2987

#ifdef __GNUC__

2988

#pragma GCC diagnostic push

2989

#pragma GCC diagnostic ignored "-Wcast-qual"

2990

#endif

2991

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

2992

#ifdef __GNUC__

2993

#pragma GCC diagnostic pop

2994

#endif

2995

2215

free(mc.current_server);

2996

2216

mc.current_server = next;

2997

2217

}

2998

2218

}

2999

2219

3000

/* Re-raise privileges */

2220

/* Re-raise priviliges */

3001

2221

{

3002

ret_errno = raise_privileges();

3003

if(ret_errno != 0){

3004

errno = ret_errno;

3005

perror_plus("Failed to raise privileges");

3006

} else {

3007

3008

/* Run network hooks */

3009

run_network_hooks("stop", interfaces_hooks != NULL ?

3010

interfaces_hooks : "", delay);

3011

3012

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

3013

{

3014

char *interface = NULL;

3015

while((interface=argz_next(interfaces_to_take_down,

3016

interfaces_to_take_down_size,

3017

interface))){

3018

ret_errno = take_down_interface(interface);

3019

if(ret_errno != 0){

3020

errno = ret_errno;

3021

perror_plus("Failed to take down interface");

3022

}

3023

}

3024

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

3025

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

3026

" down\n");

3027

}

3028

}

3029

}

3030

3031

ret_errno = lower_privileges_permanently();

3032

if(ret_errno != 0){

3033

errno = ret_errno;

3034

perror_plus("Failed to lower privileges permanently");

3035

}

3036

}

3037

3038

free(interfaces_to_take_down);

3039

free(interfaces_hooks);

2222

if(getuid() == 0){

2223

errno = 0;

2224

ret = seteuid(0);

2225

if(ret == -1){

2226

perror_plus("seteuid");

2227

}

2228

}

2229

2230

/* Run network hooks */

2231

run_network_hooks("stop", interface, delay);

2232

2233

/* Take down the network interface */

2234

if(take_down_interface and geteuid() == 0){

2235

ret = ioctl(sd, SIOCGIFFLAGS, &network);

2236

if(ret == -1){

2237

perror_plus("ioctl SIOCGIFFLAGS");

2238

} else if(network.ifr_flags & IFF_UP){

2239

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

2240

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

2241

if(ret == -1){

2242

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2243

}

2244

}

2245

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

2246

if(ret == -1){

2247

perror_plus("close");

2248

}

2249

}

2250

}

2251

if(getuid() == 0){

2252

/* Lower privileges permanently */

2253

errno = 0;

2254

ret = setuid(uid);

2255

if(ret == -1){

2256

perror_plus("setuid");

2257

}

2258

}

3040

2259

3041

2260

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

3042

if(tempdir != NULL){

2261

if(tempdir_created){

3043

2262

struct dirent **direntries = NULL;

3044

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

3045

| O_NOFOLLOW

3046

| O_DIRECTORY

3047

| O_PATH));

3048

if(tempdir_fd == -1){

3049

perror_plus("open");

3050

} else {

3051

#ifdef __GLIBC__

3052

#if __GLIBC_PREREQ(2, 15)

3053

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

3054

notdotentries, alphasort);

3055

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

3056

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

3057

alphasort);

3058

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

3059

#else /* not __GLIBC__ */

3060

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

3061

alphasort);

3062

#endif /* not __GLIBC__ */

3063

if(numentries >= 0){

3064

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

3065

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

3066

if(ret == -1){

3067

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

3068

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

3069

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

3070

}

3071

free(direntries[i]);

3072

}

3073

3074

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

3075

free(direntries);

3076

if(numentries == -1){

3077

perror_plus("scandir");

3078

}

3079

ret = rmdir(tempdir);

3080

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

3081

perror_plus("rmdir");

3082

}

2263

struct dirent *direntry = NULL;

2264

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

2265

alphasort);

2266

if (numentries > 0){

2267

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

2268

direntry = direntries[i];

2269

char *fullname = NULL;

2270

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

2271

direntry->d_name);

2272

if(ret < 0){

2273

perror_plus("asprintf");

2274

continue;

2275

}

2276

ret = remove(fullname);

2277

if(ret == -1){

2278

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

2279

strerror(errno));

2280

}

2281

free(fullname);

3083

2282

}

3084

TEMP_FAILURE_RETRY(close(tempdir_fd));

2283

}

2284

2285

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

2286

free(direntries);

2287

if (numentries == -1){

2288

perror_plus("scandir");

2289

}

2290

ret = rmdir(tempdir);

2291

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

2292

perror_plus("rmdir");

3085

2293

}

3086

2294

}

3087

2295