/mandos/release : revision 237.7.325

9

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

10

*

11

* Everything else is

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13

12

13

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*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

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#endif /* not _FILE_OFFSET_BITS */

39

40

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

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42

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

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stdout, ferror(), remove() */

44

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

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stdout, ferror() */

44

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

45

#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() */

48

#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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#include <string.h> /* strcmp(), strlen(), strerror(),

50

asprintf(), strcpy() */

51

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

52

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

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sockaddr_in6, PF_INET6,

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opendir(), DIR */

56

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

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inet_pton(), connect(),

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getnameinfo() */

60

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

60

61

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

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62

*/

62

63

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

63

64

strtoimax() */

64

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

65

#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() */

77

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

76

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

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unlinkat() */

78

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

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79

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

79

80

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

80

81

argp_state, struct argp,

88

89

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

89

90

WEXITSTATUS(), WTERMSIG() */

90

91

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

92

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

95

argz_count() */

96

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

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EAI_SYSTEM, gai_strerror() */

91

98

92

99

#ifdef __linux__

93

100

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

135

142

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

136

143

char *connect_to = NULL;

137

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

138

148

139

149

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

140

150

typedef struct server{

141

151

const char *ip;

142

uint16_t port;

152

in_port_t port;

143

153

AvahiIfIndex if_index;

144

154

int af;

145

155

struct timespec last_seen;

149

159

150

160

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

151

161

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

162

AvahiServer *server;

154

163

gnutls_certificate_credentials_t cred;

155

164

unsigned int dh_bits;

157

166

const char *priority;

158

167

gpgme_ctx_t ctx;

159

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

160

171

} mandos_context;

161

172

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

167

175

168

176

sig_atomic_t quit_now = 0;

169

177

int signal_received = 0;

170

178

171

179

/* Function to use when printing errors */

172

180

void perror_plus(const char *print_text){

181

int e = errno;

173

182

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

174

183

program_invocation_short_name);

184

errno = e;

175

185

perror(print_text);

176

186

}

177

187

188

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

178

189

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

179

190

va_list ap;

180

191

va_start (ap, format);

181

192

182

193

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

183

194

program_invocation_short_name));

184

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

195

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

185

196

}

186

197

187

198

/*

189

200

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

190

201

* "buffer_length" is how much is already used.

191

202

*/

203

__attribute__((nonnull, warn_unused_result))

192

204

size_t incbuffer(char **buffer, size_t buffer_length,

193

205

size_t buffer_capacity){

194

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

195

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

196

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

197

213

return 0;

198

214

}

215

*buffer = new_buf;

199

216

buffer_capacity += BUFFER_SIZE;

200

217

}

201

218

return buffer_capacity;

202

219

}

203

220

204

221

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

205

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

206

int af){

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){

207

225

int ret;

208

226

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

209

227

if(new_server == NULL){

216

234

.af = af };

217

235

if(new_server->ip == NULL){

218

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

219

252

return false;

220

253

}

221

254

/* Special case of first server */

222

if (mc.current_server == NULL){

255

if(*current_server == NULL){

223

256

new_server->next = new_server;

224

257

new_server->prev = new_server;

225

mc.current_server = new_server;

226

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

258

*current_server = new_server;

227

259

} else {

228

new_server->next = mc.current_server;

229

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

260

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

261

new_server->next = *current_server;

262

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

230

263

new_server->prev->next = new_server;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return false;

264

(*current_server)->prev = new_server;

237

265

}

238

266

return true;

239

267

}

241

269

/*

242

270

* Initialize GPGME.

243

271

*/

244

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

245

const char *tempdir){

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){

246

277

gpgme_error_t rc;

247

278

gpgme_engine_info_t engine_info;

248

279

249

250

280

/*

251

281

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

252

282

*/

253

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

254

284

int ret;

255

285

int fd;

256

286

gpgme_data_t pgp_data;

268

298

return false;

269

299

}

270

300

271

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

272

302

if(rc != GPG_ERR_NO_ERROR){

273

303

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

274

304

gpgme_strsource(rc), gpgme_strerror(rc));

275

305

return false;

276

306

}

277

307

278

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

308

ret = close(fd);

279

309

if(ret == -1){

280

310

perror_plus("close");

281

311

}

318

348

}

319

349

320

350

/* Create new GPGME "context" */

321

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

351

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

322

352

if(rc != GPG_ERR_NO_ERROR){

323

353

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

324

354

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

337

367

* Decrypt OpenPGP data.

338

368

* Returns -1 on error

339

369

*/

370

__attribute__((nonnull, warn_unused_result))

340

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

341

372

size_t crypto_size,

342

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

343

375

gpgme_data_t dh_crypto, dh_plain;

344

376

gpgme_error_t rc;

345

377

ssize_t ret;

371

403

372

404

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

373

405

data buffer */

374

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

406

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

375

407

if(rc != GPG_ERR_NO_ERROR){

376

408

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

377

409

gpgme_strsource(rc), gpgme_strerror(rc));

378

410

plaintext_length = -1;

379

411

if(debug){

380

412

gpgme_decrypt_result_t result;

381

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

382

414

if(result == NULL){

383

415

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

384

416

} else {

461

493

return plaintext_length;

462

494

}

463

495

464

static const char * safer_gnutls_strerror(int value){

465

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

466

-Wunreachable-code */

467

if(ret == NULL)

468

ret = "(unknown)";

469

return ret;

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);

470

507

}

471

508

472

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

473

511

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

474

512

const char* string){

475

513

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

476

514

}

477

515

516

__attribute__((nonnull, warn_unused_result))

478

517

static int init_gnutls_global(const char *pubkeyfilename,

479

const char *seckeyfilename){

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

480

521

int ret;

522

unsigned int uret;

481

523

482

524

if(debug){

483

525

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

499

541

}

500

542

501

543

/* OpenPGP credentials */

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

544

ret = gnutls_certificate_allocate_credentials(&mc->cred);

503

545

if(ret != GNUTLS_E_SUCCESS){

504

546

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

505

547

safer_gnutls_strerror(ret));

515

557

}

516

558

517

559

ret = gnutls_certificate_set_openpgp_key_file

518

(mc.cred, pubkeyfilename, seckeyfilename,

560

(mc->cred, pubkeyfilename, seckeyfilename,

519

561

GNUTLS_OPENPGP_FMT_BASE64);

520

562

if(ret != GNUTLS_E_SUCCESS){

521

563

fprintf_plus(stderr,

527

569

}

528

570

529

571

/* GnuTLS server initialization */

530

ret = gnutls_dh_params_init(&mc.dh_params);

572

ret = gnutls_dh_params_init(&mc->dh_params);

531

573

if(ret != GNUTLS_E_SUCCESS){

532

574

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

533

575

" initialization: %s\n",

534

576

safer_gnutls_strerror(ret));

535

577

goto globalfail;

536

578

}

537

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

538

if(ret != GNUTLS_E_SUCCESS){

539

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

540

safer_gnutls_strerror(ret));

541

goto globalfail;

542

}

543

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

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);

545

752

546

753

return 0;

547

754

548

755

globalfail:

549

756

550

gnutls_certificate_free_credentials(mc.cred);

757

gnutls_certificate_free_credentials(mc->cred);

551

758

gnutls_global_deinit();

552

gnutls_dh_params_deinit(mc.dh_params);

759

gnutls_dh_params_deinit(mc->dh_params);

553

760

return -1;

554

761

}

555

762

556

static int init_gnutls_session(gnutls_session_t *session){

763

__attribute__((nonnull, warn_unused_result))

764

static int init_gnutls_session(gnutls_session_t *session,

765

mandos_context *mc){

557

766

int ret;

558

767

/* GnuTLS session creation */

559

768

do {

571

780

{

572

781

const char *err;

573

782

do {

574

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

783

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

575

784

if(quit_now){

576

785

gnutls_deinit(*session);

577

786

return -1;

588

797

589

798

do {

590

799

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

591

mc.cred);

800

mc->cred);

592

801

if(quit_now){

593

802

gnutls_deinit(*session);

594

803

return -1;

604

813

/* ignore client certificate if any. */

605

814

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

606

815

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

608

609

816

return 0;

610

817

}

611

818

613

820

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

614

821

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

615

822

823

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

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

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

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

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

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

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

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

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

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

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

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

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

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

875

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

876

__attribute__((nonnull, warn_unused_result))

877

static bool add_delete_local_route(const bool add,

878

const char *address,

879

AvahiIfIndex if_index){

880

int ret;

881

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

882

char add_arg[] = "add";

883

char delete_arg[] = "delete";

884

char debug_flag[] = "--debug";

885

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

886

if(pluginhelperdir == NULL){

887

if(debug){

888

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

889

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

890

}

891

return false;

892

}

893

894

char interface[IF_NAMESIZE];

895

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

896

perror_plus("if_indextoname");

897

return false;

898

}

899

900

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

901

if(devnull == -1){

902

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

903

return false;

904

}

905

pid_t pid = fork();

906

if(pid == 0){

907

/* Child */

908

/* Raise privileges */

909

errno = raise_privileges_permanently();

910

if(errno != 0){

911

perror_plus("Failed to raise privileges");

912

/* _exit(EX_NOPERM); */

913

} else {

914

/* Set group */

915

errno = 0;

916

ret = setgid(0);

917

if(ret == -1){

918

perror_plus("setgid");

919

_exit(EX_NOPERM);

920

}

921

/* Reset supplementary groups */

922

errno = 0;

923

ret = setgroups(0, NULL);

924

if(ret == -1){

925

perror_plus("setgroups");

926

_exit(EX_NOPERM);

927

}

928

}

929

ret = dup2(devnull, STDIN_FILENO);

930

if(ret == -1){

931

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

932

_exit(EX_OSERR);

933

}

934

ret = close(devnull);

935

if(ret == -1){

936

perror_plus("close");

937

_exit(EX_OSERR);

938

}

939

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

940

if(ret == -1){

941

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

942

_exit(EX_OSERR);

943

}

944

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

945

O_RDONLY

946

| O_DIRECTORY

947

| O_PATH

948

| O_CLOEXEC));

949

if(helperdir_fd == -1){

950

perror_plus("open");

951

_exit(EX_UNAVAILABLE);

952

}

953

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

954

helper, O_RDONLY));

955

if(helper_fd == -1){

956

perror_plus("openat");

957

close(helperdir_fd);

958

_exit(EX_UNAVAILABLE);

959

}

960

close(helperdir_fd);

961

#ifdef __GNUC__

962

#pragma GCC diagnostic push

963

#pragma GCC diagnostic ignored "-Wcast-qual"

964

#endif

965

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

966

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

967

interface, debug ? debug_flag : NULL, NULL },

968

environ) == -1){

969

#ifdef __GNUC__

970

#pragma GCC diagnostic pop

971

#endif

972

perror_plus("fexecve");

973

_exit(EXIT_FAILURE);

974

}

975

}

976

if(pid == -1){

977

perror_plus("fork");

978

return false;

979

}

980

int status;

981

pid_t pret = -1;

982

errno = 0;

983

do {

984

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

985

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

986

int errno_raising = 0;

987

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

988

errno_raising = errno;

989

perror_plus("Failed to raise privileges in order to"

990

" kill helper program");

991

}

992

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

993

perror_plus("kill");

994

}

995

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

996

perror_plus("Failed to lower privileges after killing"

997

" helper program");

998

}

999

return false;

1000

}

1001

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

1002

if(pret == -1){

1003

perror_plus("waitpid");

1004

return false;

1005

}

1006

if(WIFEXITED(status)){

1007

if(WEXITSTATUS(status) != 0){

1008

fprintf_plus(stderr, "Error: iprouteadddel exited"

1009

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

1010

return false;

1011

}

1012

return true;

1013

}

1014

if(WIFSIGNALED(status)){

1015

fprintf_plus(stderr, "Error: iprouteadddel died by"

1016

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

1017

return false;

1018

}

1019

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

1020

return false;

1021

}

1022

1023

__attribute__((nonnull, warn_unused_result))

1024

static bool add_local_route(const char *address,

1025

AvahiIfIndex if_index){

1026

if(debug){

1027

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

1028

}

1029

return add_delete_local_route(true, address, if_index);

1030

}

1031

1032

__attribute__((nonnull, warn_unused_result))

1033

static bool delete_local_route(const char *address,

1034

AvahiIfIndex if_index){

1035

if(debug){

1036

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

1037

}

1038

return add_delete_local_route(false, address, if_index);

1039

}

1040

616

1041

/* Called when a Mandos server is found */

617

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

1042

__attribute__((nonnull, warn_unused_result))

1043

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

618

1044

AvahiIfIndex if_index,

619

int af){

1045

int af, mandos_context *mc){

620

1046

int ret, tcp_sd = -1;

621

1047

ssize_t sret;

622

union {

623

struct sockaddr_in in;

624

struct sockaddr_in6 in6;

625

} to;

1048

struct sockaddr_storage to;

626

1049

char *buffer = NULL;

627

1050

char *decrypted_buffer = NULL;

628

1051

size_t buffer_length = 0;

631

1054

int retval = -1;

632

1055

gnutls_session_t session;

633

1056

int pf; /* Protocol family */

1057

bool route_added = false;

634

1058

635

1059

errno = 0;

636

1060

652

1076

return -1;

653

1077

}

654

1078

655

ret = init_gnutls_session(&session);

1079

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

1080

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

1081

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

1082

bool match = false;

1083

{

1084

char *interface = NULL;

1085

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

1086

interface))){

1087

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

1088

match = true;

1089

break;

1090

}

1091

}

1092

}

1093

if(not match){

1094

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

1095

connect to the server */

1096

if(debug){

1097

char interface[IF_NAMESIZE];

1098

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

1099

perror_plus("if_indextoname");

1100

} else {

1101

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

1102

" \"%s\"\n",

1103

if_indextoname((unsigned int)if_index,

1104

interface));

1105

}

1106

}

1107

return -1;

1108

}

1109

}

1110

1111

ret = init_gnutls_session(&session, mc);

656

1112

if(ret != 0){

657

1113

return -1;

658

1114

}

659

1115

660

1116

if(debug){

661

1117

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

662

PRIu16 "\n", ip, port);

1118

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

663

1119

}

664

1120

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

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

666

1122

if(tcp_sd < 0){

667

1123

int e = errno;

668

1124

perror_plus("socket");

675

1131

goto mandos_end;

676

1132

}

677

1133

678

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

679

1134

if(af == AF_INET6){

680

to.in6.sin6_family = (sa_family_t)af;

681

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

1135

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1136

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1137

ret = inet_pton(af, ip, &to6->sin6_addr);

682

1138

} else { /* IPv4 */

683

to.in.sin_family = (sa_family_t)af;

684

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

1139

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1140

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1141

ret = inet_pton(af, ip, &to4->sin_addr);

685

1142

}

686

1143

if(ret < 0 ){

687

1144

int e = errno;

696

1153

goto mandos_end;

697

1154

}

698

1155

if(af == AF_INET6){

699

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

700

-Wconversion and

701

-Wunreachable-code */

702

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

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

705

-Wunreachable-code*/

1156

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

1157

if(IN6_IS_ADDR_LINKLOCAL

1158

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

706

1159

if(if_index == AVAHI_IF_UNSPEC){

707

1160

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

708

1161

" incomplete without a network interface\n");

710

1163

goto mandos_end;

711

1164

}

712

1165

/* Set the network interface number as scope */

713

to.in6.sin6_scope_id = (uint32_t)if_index;

1166

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

714

1167

}

715

1168

} else {

716

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

717

-Wconversion and

718

-Wunreachable-code */

1169

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

719

1170

}

720

1171

721

1172

if(quit_now){

729

1180

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

730

1181

perror_plus("if_indextoname");

731

1182

} else {

732

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

733

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

1183

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

1184

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

734

1185

}

735

1186

} else {

736

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

737

ip, port);

1187

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

1188

ip, (uintmax_t)port);

738

1189

}

739

1190

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

740

1191

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

741

const char *pcret;

742

if(af == AF_INET6){

743

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

744

sizeof(addrstr));

745

} else {

746

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

747

sizeof(addrstr));

748

}

749

if(pcret == NULL){

750

perror_plus("inet_ntop");

751

} else {

752

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

753

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

754

}

755

}

756

}

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

761

}

762

763

if(af == AF_INET6){

764

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

765

} else {

766

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

767

}

768

if(ret < 0){

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

774

goto mandos_end;

775

}

776

777

if(quit_now){

778

errno = EINTR;

779

goto mandos_end;

1192

if(af == AF_INET6){

1193

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

1194

sizeof(struct sockaddr_in6),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

} else {

1198

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

1199

sizeof(struct sockaddr_in),

1200

addrstr, sizeof(addrstr), NULL, 0,

1201

NI_NUMERICHOST);

1202

}

1203

if(ret == EAI_SYSTEM){

1204

perror_plus("getnameinfo");

1205

} else if(ret != 0) {

1206

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

1207

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

1208

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

1209

}

1210

}

1211

1212

if(quit_now){

1213

errno = EINTR;

1214

goto mandos_end;

1215

}

1216

1217

while(true){

1218

if(af == AF_INET6){

1219

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

1220

sizeof(struct sockaddr_in6));

1221

} else {

1222

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

1223

sizeof(struct sockaddr_in));

1224

}

1225

if(ret < 0){

1226

if(errno == ENETUNREACH

1227

and if_index != AVAHI_IF_UNSPEC

1228

and connect_to == NULL

1229

and not route_added and

1230

((af == AF_INET6 and not

1231

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1232

&to)->sin6_addr)))

1233

or (af == AF_INET and

1234

/* Not a a IPv4LL address */

1235

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

1236

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

1237

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

1238

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

1239

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

1240

connect to a Mandos server announced by Avahi on a server

1241

host with a global address. Work around this by retrying

1242

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

1243

1244

Avahi bug reference:

1245

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

1246

https://bugs.debian.org/587961

1247

*/

1248

if(debug){

1249

fprintf_plus(stderr, "Mandos server unreachable, trying"

1250

" direct route\n");

1251

}

1252

int e = errno;

1253

route_added = add_local_route(ip, if_index);

1254

if(route_added){

1255

continue;

1256

}

1257

errno = e;

1258

}

1259

if(errno != ECONNREFUSED or debug){

1260

int e = errno;

1261

perror_plus("connect");

1262

errno = e;

1263

}

1264

goto mandos_end;

1265

}

1266

1267

if(quit_now){

1268

errno = EINTR;

1269

goto mandos_end;

1270

}

1271

break;

780

1272

}

781

1273

782

1274

const char *out = mandos_protocol_version;

818

1310

goto mandos_end;

819

1311

}

820

1312

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1313

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

1314

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

1315

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

1316

gnutls_transport_set_ptr(session,

1317

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

823

1318

824

1319

if(quit_now){

825

1320

errno = EINTR;

930

1425

if(buffer_length > 0){

931

1426

ssize_t decrypted_buffer_size;

932

1427

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

933

&decrypted_buffer);

1428

&decrypted_buffer, mc);

934

1429

if(decrypted_buffer_size >= 0){

935

1430

936

1431

written = 0;

962

1457

963

1458

mandos_end:

964

1459

{

1460

if(route_added){

1461

if(not delete_local_route(ip, if_index)){

1462

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

1463

" interface %d", ip, if_index);

1464

}

1465

}

965

1466

int e = errno;

966

1467

free(decrypted_buffer);

967

1468

free(buffer);

968

1469

if(tcp_sd >= 0){

969

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

1470

ret = close(tcp_sd);

970

1471

}

971

1472

if(ret == -1){

972

1473

if(e == 0){

984

1485

return retval;

985

1486

}

986

1487

1488

__attribute__((nonnull))

987

1489

static void resolve_callback(AvahiSServiceResolver *r,

988

1490

AvahiIfIndex interface,

989

1491

AvahiProtocol proto,

997

1499

AVAHI_GCC_UNUSED AvahiStringList *txt,

998

1500

AVAHI_GCC_UNUSED AvahiLookupResultFlags

999

1501

flags,

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1502

void *mc){

1503

if(r == NULL){

1504

return;

1505

}

1002

1506

1003

1507

/* Called whenever a service has been resolved successfully or

1004

1508

timed out */

1005

1509

1006

1510

if(quit_now){

1511

avahi_s_service_resolver_free(r);

1007

1512

return;

1008

1513

}

1009

1514

1013

1518

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

1014

1519

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

1015

1520

domain,

1016

avahi_strerror(avahi_server_errno(mc.server)));

1521

avahi_strerror(avahi_server_errno

1522

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

1017

1523

break;

1018

1524

1019

1525

case AVAHI_RESOLVER_FOUND:

1025

1531

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

1026

1532

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

1027

1533

}

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1534

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

1535

interface,

1536

avahi_proto_to_af(proto),

1537

mc);

1030

1538

if(ret == 0){

1031

avahi_simple_poll_quit(mc.simple_poll);

1539

avahi_simple_poll_quit(simple_poll);

1032

1540

} else {

1033

if(not add_server(ip, port, interface,

1034

avahi_proto_to_af(proto))){

1541

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

1542

avahi_proto_to_af(proto),

1543

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

1035

1544

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

1036

1545

" list\n", name);

1037

1546

}

1050

1559

const char *domain,

1051

1560

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1052

1561

flags,

1053

AVAHI_GCC_UNUSED void* userdata){

1054

assert(b);

1562

void *mc){

1563

if(b == NULL){

1564

return;

1565

}

1055

1566

1056

1567

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

1057

1568

is removed from the LAN */

1065

1576

case AVAHI_BROWSER_FAILURE:

1066

1577

1067

1578

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

1068

avahi_strerror(avahi_server_errno(mc.server)));

1069

avahi_simple_poll_quit(mc.simple_poll);

1579

avahi_strerror(avahi_server_errno

1580

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

1581

avahi_simple_poll_quit(simple_poll);

1070

1582

return;

1071

1583

1072

1584

case AVAHI_BROWSER_NEW:

1075

1587

the callback function is called the Avahi server will free the

1076

1588

resolver for us. */

1077

1589

1078

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

1079

name, type, domain, protocol, 0,

1080

resolve_callback, NULL) == NULL)

1590

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

1591

interface, protocol, name, type,

1592

domain, protocol, 0,

1593

resolve_callback, mc) == NULL)

1081

1594

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

1082

1595

" %s\n", name,

1083

avahi_strerror(avahi_server_errno(mc.server)));

1596

avahi_strerror(avahi_server_errno

1597

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

1084

1598

break;

1085

1599

1086

1600

case AVAHI_BROWSER_REMOVE:

1105

1619

signal_received = sig;

1106

1620

int old_errno = errno;

1107

1621

/* set main loop to exit */

1108

if(mc.simple_poll != NULL){

1109

avahi_simple_poll_quit(mc.simple_poll);

1622

if(simple_poll != NULL){

1623

avahi_simple_poll_quit(simple_poll);

1110

1624

}

1111

1625

errno = old_errno;

1112

1626

}

1113

1627

1628

__attribute__((nonnull, warn_unused_result))

1114

1629

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

1115

1630

int ret;

1631

error_t ret_errno;

1116

1632

1117

1633

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

1118

1634

if(s < 0){

1635

ret_errno = errno;

1119

1636

perror_plus("socket");

1637

errno = ret_errno;

1120

1638

return false;

1121

1639

}

1122

1640

strcpy(ifr->ifr_name, ifname);

1123

1641

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1124

1642

if(ret == -1){

1125

1643

if(debug){

1644

ret_errno = errno;

1126

1645

perror_plus("ioctl SIOCGIFFLAGS");

1646

errno = ret_errno;

1127

1647

}

1128

1648

return false;

1129

1649

}

1130

1650

return true;

1131

1651

}

1132

1652

1653

__attribute__((nonnull, warn_unused_result))

1133

1654

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

1134

1655

1135

1656

/* Reject the loopback device */

1177

1698

* corresponds to an acceptable network device.

1178

1699

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

1179

1700

*/

1701

__attribute__((nonnull, warn_unused_result))

1180

1702

int good_interface(const struct dirent *if_entry){

1181

1703

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

1182

1704

return 0;

1198

1720

}

1199

1721

1200

1722

/*

1201

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

1202

* corresponds to an acceptable network device which is up.

1203

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

1204

*/

1205

int up_interface(const struct dirent *if_entry){

1206

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

1207

return 0;

1208

}

1209

1210

struct ifreq ifr;

1211

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

1212

if(debug){

1213

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

1214

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

1215

}

1216

return 0;

1217

}

1218

1219

/* Reject down interfaces */

1220

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

1221

if(debug){

1222

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

1223

if_entry->d_name);

1224

}

1225

return 0;

1226

}

1227

1228

/* Reject non-running interfaces */

1229

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

1230

if(debug){

1231

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

1232

if_entry->d_name);

1233

}

1234

return 0;

1235

}

1236

1237

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

1238

return 0;

1239

}

1240

return 1;

1241

}

1242

1723

* This function determines if a network interface is up.

1724

*/

1725

__attribute__((nonnull, warn_unused_result))

1726

bool interface_is_up(const char *interface){

1727

struct ifreq ifr;

1728

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

1729

if(debug){

1730

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

1731

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

1732

}

1733

return false;

1734

}

1735

1736

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

1737

}

1738

1739

/*

1740

* This function determines if a network interface is running

1741

*/

1742

__attribute__((nonnull, warn_unused_result))

1743

bool interface_is_running(const char *interface){

1744

struct ifreq ifr;

1745

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

1746

if(debug){

1747

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

1748

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

1749

}

1750

return false;

1751

}

1752

1753

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

1754

}

1755

1756

__attribute__((nonnull, pure, warn_unused_result))

1243

1757

int notdotentries(const struct dirent *direntry){

1244

1758

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

1245

1759

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

1252

1766

}

1253

1767

1254

1768

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

1769

__attribute__((nonnull, warn_unused_result))

1255

1770

int runnable_hook(const struct dirent *direntry){

1256

1771

int ret;

1257

1772

size_t sret;

1265

1780

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

1266

1781

"abcdefghijklmnopqrstuvwxyz"

1267

1782

"0123456789"

1268

"_-");

1783

"_.-");

1269

1784

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

1270

1785

/* Contains non-allowed characters */

1271

1786

if(debug){

1275

1790

return 0;

1276

1791

}

1277

1792

1278

char *fullname = NULL;

1279

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

1280

if(ret < 0){

1281

perror_plus("asprintf");

1282

return 0;

1283

}

1284

1285

ret = stat(fullname, &st);

1793

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

1286

1794

if(ret == -1){

1287

1795

if(debug){

1288

1796

perror_plus("Could not stat hook");

1312

1820

return 1;

1313

1821

}

1314

1822

1315

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1823

__attribute__((nonnull, warn_unused_result))

1824

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1825

mandos_context *mc){

1316

1826

int ret;

1317

1827

struct timespec now;

1318

1828

struct timespec waited_time;

1319

1829

intmax_t block_time;

1320

1830

1321

1831

while(true){

1322

if(mc.current_server == NULL){

1323

if (debug){

1832

if(mc->current_server == NULL){

1833

if(debug){

1324

1834

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

1325

1835

" No timeout!\n");

1326

1836

}

1327

1837

ret = avahi_simple_poll_iterate(s, -1);

1328

1838

} else {

1329

if (debug){

1839

if(debug){

1330

1840

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

1331

1841

" it, or wait\n");

1332

1842

}

1339

1849

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

1340

1850

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

1341

1851

waited_time.tv_sec = (now.tv_sec

1342

- mc.current_server->last_seen.tv_sec);

1852

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

1343

1853

waited_time.tv_nsec = (now.tv_nsec

1344

- mc.current_server->last_seen.tv_nsec);

1854

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

1345

1855

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

1346

1856

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

1347

1857

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

1349

1859

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

1350

1860

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

1351

1861

1352

if (debug){

1862

if(debug){

1353

1863

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

1354

1864

block_time);

1355

1865

}

1356

1866

1357

1867

if(block_time <= 0){

1358

ret = start_mandos_communication(mc.current_server->ip,

1359

mc.current_server->port,

1360

mc.current_server->if_index,

1361

mc.current_server->af);

1868

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

1869

mc->current_server->port,

1870

mc->current_server->if_index,

1871

mc->current_server->af, mc);

1362

1872

if(ret == 0){

1363

avahi_simple_poll_quit(mc.simple_poll);

1873

avahi_simple_poll_quit(s);

1364

1874

return 0;

1365

1875

}

1366

1876

ret = clock_gettime(CLOCK_MONOTONIC,

1367

&mc.current_server->last_seen);

1877

&mc->current_server->last_seen);

1368

1878

if(ret == -1){

1369

1879

perror_plus("clock_gettime");

1370

1880

return -1;

1371

1881

}

1372

mc.current_server = mc.current_server->next;

1882

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

1373

1883

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

1374

1884

servers, but don't block */

1375

1885

}

1377

1887

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

1378

1888

}

1379

1889

if(ret != 0){

1380

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

1890

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

1381

1891

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

1382

1892

}

1383

1893

}

1384

1894

}

1385

1895

}

1386

1896

1387

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

1897

__attribute__((nonnull))

1898

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

1388

1899

const float delay){

1389

struct dirent **direntries;

1390

struct dirent *direntry;

1391

int ret;

1392

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

1393

alphasort);

1900

struct dirent **direntries = NULL;

1901

if(hookdir_fd == -1){

1902

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1903

| O_CLOEXEC);

1904

if(hookdir_fd == -1){

1905

if(errno == ENOENT){

1906

if(debug){

1907

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

1908

" found\n", hookdir);

1909

}

1910

} else {

1911

perror_plus("open");

1912

}

1913

return;

1914

}

1915

}

1916

#ifdef __GLIBC__

1917

#if __GLIBC_PREREQ(2, 15)

1918

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

1919

runnable_hook, alphasort);

1920

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

1921

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

1922

alphasort);

1923

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

1924

#else /* not __GLIBC__ */

1925

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

1926

alphasort);

1927

#endif /* not __GLIBC__ */

1394

1928

if(numhooks == -1){

1395

1929

perror_plus("scandir");

1396

} else {

1397

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

1398

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

1399

direntry = direntries[i];

1400

char *fullname = NULL;

1401

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

1402

if(ret < 0){

1930

return;

1931

}

1932

struct dirent *direntry;

1933

int ret;

1934

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

1935

if(devnull == -1){

1936

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

1937

return;

1938

}

1939

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

1940

direntry = direntries[i];

1941

if(debug){

1942

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

1943

direntry->d_name);

1944

}

1945

pid_t hook_pid = fork();

1946

if(hook_pid == 0){

1947

/* Child */

1948

/* Raise privileges */

1949

errno = raise_privileges_permanently();

1950

if(errno != 0){

1951

perror_plus("Failed to raise privileges");

1952

_exit(EX_NOPERM);

1953

}

1954

/* Set group */

1955

errno = 0;

1956

ret = setgid(0);

1957

if(ret == -1){

1958

perror_plus("setgid");

1959

_exit(EX_NOPERM);

1960

}

1961

/* Reset supplementary groups */

1962

errno = 0;

1963

ret = setgroups(0, NULL);

1964

if(ret == -1){

1965

perror_plus("setgroups");

1966

_exit(EX_NOPERM);

1967

}

1968

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

1969

if(ret == -1){

1970

perror_plus("setenv");

1971

_exit(EX_OSERR);

1972

}

1973

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

1974

if(ret == -1){

1975

perror_plus("setenv");

1976

_exit(EX_OSERR);

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("setenv");

1981

_exit(EX_OSERR);

1982

}

1983

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

1984

if(ret == -1){

1985

perror_plus("setenv");

1986

_exit(EX_OSERR);

1987

}

1988

char *delaystring;

1989

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

1990

if(ret == -1){

1403

1991

perror_plus("asprintf");

1404

continue;

1405

}

1406

if(debug){

1407

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

1408

direntry->d_name);

1409

}

1410

pid_t hook_pid = fork();

1411

if(hook_pid == 0){

1412

/* Child */

1413

/* Raise privileges */

1414

errno = 0;

1415

ret = seteuid(0);

1416

if(ret == -1){

1417

perror_plus("seteuid");

1418

}

1419

/* Raise privileges even more */

1420

errno = 0;

1421

ret = setuid(0);

1422

if(ret == -1){

1423

perror_plus("setuid");

1424

}

1425

/* Set group */

1426

errno = 0;

1427

ret = setgid(0);

1428

if(ret == -1){

1429

perror_plus("setgid");

1430

}

1431

/* Reset supplementary groups */

1432

errno = 0;

1433

ret = setgroups(0, NULL);

1434

if(ret == -1){

1435

perror_plus("setgroups");

1436

}

1437

dup2(devnull, STDIN_FILENO);

1438

close(devnull);

1439

dup2(STDERR_FILENO, STDOUT_FILENO);

1440

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

1441

if(ret == -1){

1442

perror_plus("setenv");

1443

_exit(EX_OSERR);

1444

}

1445

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

1446

if(ret == -1){

1447

perror_plus("setenv");

1448

_exit(EX_OSERR);

1449

}

1450

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

1451

if(ret == -1){

1452

perror_plus("setenv");

1453

_exit(EX_OSERR);

1454

}

1455

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

1456

if(ret == -1){

1457

perror_plus("setenv");

1458

_exit(EX_OSERR);

1459

}

1460

char *delaystring;

1461

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

1462

if(ret == -1){

1463

perror_plus("asprintf");

1464

_exit(EX_OSERR);

1465

}

1466

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

1467

if(ret == -1){

1468

free(delaystring);

1469

perror_plus("setenv");

1470

_exit(EX_OSERR);

1471

}

1992

_exit(EX_OSERR);

1993

}

1994

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

1995

if(ret == -1){

1472

1996

free(delaystring);

1473

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

1474

perror_plus("execl");

1475

} else {

1476

int status;

1477

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

1478

perror_plus("waitpid");

1479

free(fullname);

1480

continue;

1481

}

1482

if(WIFEXITED(status)){

1483

if(WEXITSTATUS(status) != 0){

1484

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

1485

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

1486

WEXITSTATUS(status));

1487

free(fullname);

1488

continue;

1489

}

1490

} else if(WIFSIGNALED(status)){

1491

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

1492

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

1493

WTERMSIG(status));

1494

free(fullname);

1495

continue;

1496

} else {

1497

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

1498

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

1499

free(fullname);

1500

continue;

1501

}

1502

}

1503

free(fullname);

1504

if(debug){

1505

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

1506

direntry->d_name);

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

1997

perror_plus("setenv");

1998

_exit(EX_OSERR);

1999

}

2000

free(delaystring);

2001

if(connect_to != NULL){

2002

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

2003

if(ret == -1){

2004

perror_plus("setenv");

2005

_exit(EX_OSERR);

2006

}

2007

}

2008

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

2009

direntry->d_name,

2010

O_RDONLY));

2011

if(hook_fd == -1){

2012

perror_plus("openat");

2013

_exit(EXIT_FAILURE);

2014

}

2015

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

2016

perror_plus("close");

2017

_exit(EXIT_FAILURE);

2018

}

2019

ret = dup2(devnull, STDIN_FILENO);

2020

if(ret == -1){

2021

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

2022

_exit(EX_OSERR);

2023

}

2024

ret = close(devnull);

2025

if(ret == -1){

2026

perror_plus("close");

2027

_exit(EX_OSERR);

2028

}

2029

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2030

if(ret == -1){

2031

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

2032

_exit(EX_OSERR);

2033

}

2034

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

2035

environ) == -1){

2036

perror_plus("fexecve");

2037

_exit(EXIT_FAILURE);

2038

}

2039

} else {

2040

if(hook_pid == -1){

2041

perror_plus("fork");

2042

free(direntry);

2043

continue;

2044

}

2045

int status;

2046

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

2047

perror_plus("waitpid");

2048

free(direntry);

2049

continue;

2050

}

2051

if(WIFEXITED(status)){

2052

if(WEXITSTATUS(status) != 0){

2053

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

2054

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

2055

WEXITSTATUS(status));

2056

free(direntry);

2057

continue;

2058

}

2059

} else if(WIFSIGNALED(status)){

2060

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

2061

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

2062

WTERMSIG(status));

2063

free(direntry);

2064

continue;

2065

} else {

2066

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

2067

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

2068

free(direntry);

2069

continue;

2070

}

2071

}

2072

if(debug){

2073

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

2074

direntry->d_name);

2075

}

2076

free(direntry);

2077

}

2078

free(direntries);

2079

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

2080

perror_plus("close");

2081

} else {

2082

hookdir_fd = -1;

2083

}

2084

close(devnull);

2085

}

2086

2087

__attribute__((nonnull, warn_unused_result))

2088

error_t bring_up_interface(const char *const interface,

2089

const float delay){

2090

error_t old_errno = errno;

2091

int ret;

2092

struct ifreq network;

2093

unsigned int if_index = if_nametoindex(interface);

2094

if(if_index == 0){

2095

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

2096

errno = old_errno;

2097

return ENXIO;

2098

}

2099

2100

if(quit_now){

2101

errno = old_errno;

2102

return EINTR;

2103

}

2104

2105

if(not interface_is_up(interface)){

2106

error_t ret_errno = 0, ioctl_errno = 0;

2107

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

2108

ret_errno = errno;

2109

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

2110

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

2111

errno = old_errno;

2112

return ret_errno;

2113

}

2114

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

2115

2116

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

2117

if(sd == -1){

2118

ret_errno = errno;

2119

perror_plus("socket");

2120

errno = old_errno;

2121

return ret_errno;

2122

}

2123

2124

if(quit_now){

2125

ret = close(sd);

2126

if(ret == -1){

2127

perror_plus("close");

2128

}

2129

errno = old_errno;

2130

return EINTR;

2131

}

2132

2133

if(debug){

2134

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

2135

interface);

2136

}

2137

2138

/* Raise privileges */

2139

ret_errno = raise_privileges();

2140

if(ret_errno != 0){

2141

errno = ret_errno;

2142

perror_plus("Failed to raise privileges");

2143

}

2144

2145

#ifdef __linux__

2146

int ret_linux;

2147

bool restore_loglevel = false;

2148

if(ret_errno == 0){

2149

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2150

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

2151

ret_linux = klogctl(8, NULL, 5);

2152

if(ret_linux == -1){

2153

perror_plus("klogctl");

2154

} else {

2155

restore_loglevel = true;

2156

}

2157

}

2158

#endif /* __linux__ */

2159

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

2160

ioctl_errno = errno;

2161

#ifdef __linux__

2162

if(restore_loglevel){

2163

ret_linux = klogctl(7, NULL, 0);

2164

if(ret_linux == -1){

2165

perror_plus("klogctl");

2166

}

2167

}

2168

#endif /* __linux__ */

2169

2170

/* If raise_privileges() succeeded above */

2171

if(ret_errno == 0){

2172

/* Lower privileges */

2173

ret_errno = lower_privileges();

2174

if(ret_errno != 0){

2175

errno = ret_errno;

2176

perror_plus("Failed to lower privileges");

2177

}

2178

}

2179

2180

/* Close the socket */

2181

ret = close(sd);

2182

if(ret == -1){

2183

perror_plus("close");

2184

}

2185

2186

if(ret_setflags == -1){

2187

errno = ioctl_errno;

2188

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2189

errno = old_errno;

2190

return ioctl_errno;

2191

}

2192

} else if(debug){

2193

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

2194

interface);

2195

}

2196

2197

/* Sleep checking until interface is running.

2198

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

2199

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

2200

if(interface_is_running(interface)){

2201

break;

2202

}

2203

struct timespec sleeptime = { .tv_nsec = 250000000 };

2204

ret = nanosleep(&sleeptime, NULL);

2205

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

2206

perror_plus("nanosleep");

2207

}

2208

}

2209

2210

errno = old_errno;

2211

return 0;

2212

}

2213

2214

__attribute__((nonnull, warn_unused_result))

2215

error_t take_down_interface(const char *const interface){

2216

error_t old_errno = errno;

2217

struct ifreq network;

2218

unsigned int if_index = if_nametoindex(interface);

2219

if(if_index == 0){

2220

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

2221

errno = old_errno;

2222

return ENXIO;

2223

}

2224

if(interface_is_up(interface)){

2225

error_t ret_errno = 0, ioctl_errno = 0;

2226

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

2227

ret_errno = errno;

2228

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

2229

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

2230

errno = old_errno;

2231

return ret_errno;

2232

}

2233

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

2234

2235

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

2236

if(sd == -1){

2237

ret_errno = errno;

2238

perror_plus("socket");

2239

errno = old_errno;

2240

return ret_errno;

2241

}

2242

2243

if(debug){

2244

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

2245

interface);

2246

}

2247

2248

/* Raise privileges */

2249

ret_errno = raise_privileges();

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("Failed to raise privileges");

2253

}

2254

2255

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

2256

ioctl_errno = errno;

2257

2258

/* If raise_privileges() succeeded above */

2259

if(ret_errno == 0){

2260

/* Lower privileges */

2261

ret_errno = lower_privileges();

2262

if(ret_errno != 0){

2263

errno = ret_errno;

2264

perror_plus("Failed to lower privileges");

2265

}

2266

}

2267

2268

/* Close the socket */

2269

int ret = close(sd);

2270

if(ret == -1){

2271

perror_plus("close");

2272

}

2273

2274

if(ret_setflags == -1){

2275

errno = ioctl_errno;

2276

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2277

errno = old_errno;

2278

return ioctl_errno;

2279

}

2280

} else if(debug){

2281

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

2282

interface);

2283

}

2284

2285

errno = old_errno;

2286

return 0;

1512

2287

}

1513

2288

1514

2289

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

2290

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

2291

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

2292

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

2293

.current_server = NULL, .interfaces = NULL,

2294

.interfaces_size = 0 };

1515

2295

AvahiSServiceBrowser *sb = NULL;

1516

int error;

2296

error_t ret_errno;

1517

2297

int ret;

1518

2298

intmax_t tmpmax;

1519

2299

char *tmp;

1520

2300

int exitcode = EXIT_SUCCESS;

1521

const char *interface = "";

1522

struct ifreq network;

1523

int sd = -1;

1524

bool take_down_interface = false;

1525

uid_t uid;

1526

gid_t gid;

1527

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

1528

bool tempdir_created = false;

2301

char *interfaces_to_take_down = NULL;

2302

size_t interfaces_to_take_down_size = 0;

2303

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

2304

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

2305

char *tempdir = NULL;

1529

2306

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1530

2307

const char *seckey = PATHDIR "/" SECKEY;

1531

2308

const char *pubkey = PATHDIR "/" PUBKEY;

2309

const char *dh_params_file = NULL;

2310

char *interfaces_hooks = NULL;

1532

2311

1533

2312

bool gnutls_initialized = false;

1534

2313

bool gpgme_initialized = false;

1586

2365

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

1587

2366

" Diffie-Hellman key exchange",

1588

2367

.group = 2 },

2368

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

2369

.arg = "FILE",

2370

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

2371

" for the Diffie-Hellman key exchange",

2372

.group = 2 },

1589

2373

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

1590

2374

.arg = "STRING",

1591

2375

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

1596

2380

.group = 2 },

1597

2381

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

1598

2382

.arg = "SECONDS",

1599

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

2383

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

1600

2384

.group = 2 },

1601

2385

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

1602

2386

.arg = "DIR",

1625

2409

connect_to = arg;

1626

2410

break;

1627

2411

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

1628

interface = arg;

2412

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

2413

arg, (int)',');

2414

if(ret_errno != 0){

2415

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

2416

}

1629

2417

break;

1630

2418

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

1631

2419

seckey = arg;

1642

2430

}

1643

2431

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

1644

2432

break;

2433

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

2434

dh_params_file = arg;

2435

break;

1645

2436

case 130: /* --priority */

1646

2437

mc.priority = arg;

1647

2438

break;

1703

2494

goto end;

1704

2495

}

1705

2496

}

1706

2497

1707

2498

{

1708

2499

/* Work around Debian bug #633582:

1709

2500

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

1710

2501

1711

/* Re-raise priviliges */

1712

errno = 0;

1713

ret = seteuid(0);

1714

if(ret == -1){

1715

perror_plus("seteuid");

2502

/* Re-raise privileges */

2503

ret_errno = raise_privileges();

2504

if(ret_errno != 0){

2505

errno = ret_errno;

2506

perror_plus("Failed to raise privileges");

1716

2507

} else {

1717

2508

struct stat st;

1718

2509

1733

2524

}

1734

2525

}

1735

2526

}

1736

TEMP_FAILURE_RETRY(close(seckey_fd));

2527

close(seckey_fd);

1737

2528

}

1738

2529

}

1739

2530

1740

2531

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

1741

2532

int pubkey_fd = open(pubkey, O_RDONLY);

1742

2533

if(pubkey_fd == -1){

1754

2545

}

1755

2546

}

1756

2547

}

1757

TEMP_FAILURE_RETRY(close(pubkey_fd));

1758

}

1759

}

1760

2548

close(pubkey_fd);

2549

}

2550

}

2551

2552

if(dh_params_file != NULL

2553

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

2554

int dhparams_fd = open(dh_params_file, O_RDONLY);

2555

if(dhparams_fd == -1){

2556

perror_plus("open");

2557

} else {

2558

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

2559

if(ret == -1){

2560

perror_plus("fstat");

2561

} else {

2562

if(S_ISREG(st.st_mode)

2563

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

2564

ret = fchown(dhparams_fd, uid, gid);

2565

if(ret == -1){

2566

perror_plus("fchown");

2567

}

2568

}

2569

}

2570

close(dhparams_fd);

2571

}

2572

}

2573

1761

2574

/* Lower privileges */

1762

errno = 0;

1763

ret = seteuid(uid);

1764

if(ret == -1){

1765

perror_plus("seteuid");

2575

ret_errno = lower_privileges();

2576

if(ret_errno != 0){

2577

errno = ret_errno;

2578

perror_plus("Failed to lower privileges");

2579

}

2580

}

2581

}

2582

2583

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

2584

{

2585

char *interface = NULL;

2586

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

2587

interface))){

2588

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

2589

and if_nametoindex(interface) == 0){

2590

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

2591

fprintf_plus(stderr, "Not using nonexisting interface"

2592

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

2593

}

2594

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

2595

interface = NULL;

1766

2596

}

1767

2597

}

1768

2598

}

1769

2599

1770

2600

/* Run network hooks */

1771

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

1772

goto end;

2601

{

2602

if(mc.interfaces != NULL){

2603

interfaces_hooks = malloc(mc.interfaces_size);

2604

if(interfaces_hooks == NULL){

2605

perror_plus("malloc");

2606

goto end;

2607

}

2608

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

2609

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

2610

}

2611

run_network_hooks("start", interfaces_hooks != NULL ?

2612

interfaces_hooks : "", delay);

1773

2613

}

1774

2614

1775

2615

if(not debug){

1776

2616

avahi_set_log_function(empty_log);

1777

2617

}

1778

2618

1779

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

1780

struct dirent **direntries;

1781

/* First look for interfaces that are up */

1782

ret = scandir(sys_class_net, &direntries, up_interface,

1783

alphasort);

1784

if(ret == 0){

1785

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

1786

free(direntries);

1787

ret = scandir(sys_class_net, &direntries, good_interface,

1788

alphasort);

1789

}

1790

if(ret >= 1){

1791

/* Pick the first interface returned */

1792

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

1793

if(debug){

1794

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

1795

}

1796

if(interface == NULL){

1797

perror_plus("malloc");

1798

free(direntries);

1799

exitcode = EXIT_FAILURE;

1800

goto end;

1801

}

1802

free(direntries);

1803

} else {

1804

free(direntries);

1805

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

1806

exitcode = EXIT_FAILURE;

1807

goto end;

1808

}

1809

}

1810

1811

2619

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

1812

2620

from the signal handler */

1813

2621

/* Initialize the pseudo-RNG for Avahi */

1814

2622

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

1815

mc.simple_poll = avahi_simple_poll_new();

1816

if(mc.simple_poll == NULL){

2623

simple_poll = avahi_simple_poll_new();

2624

if(simple_poll == NULL){

1817

2625

fprintf_plus(stderr,

1818

2626

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

1819

2627

exitcode = EX_UNAVAILABLE;

1883

2691

}

1884

2692

}

1885

2693

1886

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

1887

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

1888

if_index = (AvahiIfIndex) if_nametoindex(interface);

1889

if(if_index == 0){

1890

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

1891

exitcode = EX_UNAVAILABLE;

1892

goto end;

1893

}

1894

1895

if(quit_now){

1896

goto end;

1897

}

1898

1899

/* Re-raise priviliges */

1900

errno = 0;

1901

ret = seteuid(0);

1902

if(ret == -1){

1903

perror_plus("seteuid");

1904

}

1905

1906

#ifdef __linux__

1907

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1908

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

1909

ret = klogctl(8, NULL, 5);

1910

bool restore_loglevel = true;

1911

if(ret == -1){

1912

restore_loglevel = false;

1913

perror_plus("klogctl");

1914

}

1915

#endif /* __linux__ */

1916

1917

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1918

if(sd < 0){

1919

perror_plus("socket");

1920

exitcode = EX_OSERR;

1921

#ifdef __linux__

1922

if(restore_loglevel){

1923

ret = klogctl(7, NULL, 0);

1924

if(ret == -1){

1925

perror_plus("klogctl");

1926

}

1927

}

1928

#endif /* __linux__ */

1929

/* Lower privileges */

1930

errno = 0;

1931

ret = seteuid(uid);

1932

if(ret == -1){

1933

perror_plus("seteuid");

1934

}

1935

goto end;

1936

}

1937

strcpy(network.ifr_name, interface);

1938

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

1939

if(ret == -1){

1940

perror_plus("ioctl SIOCGIFFLAGS");

1941

#ifdef __linux__

1942

if(restore_loglevel){

1943

ret = klogctl(7, NULL, 0);

1944

if(ret == -1){

1945

perror_plus("klogctl");

1946

}

1947

}

1948

#endif /* __linux__ */

1949

exitcode = EX_OSERR;

1950

/* Lower privileges */

1951

errno = 0;

1952

ret = seteuid(uid);

1953

if(ret == -1){

1954

perror_plus("seteuid");

1955

}

1956

goto end;

1957

}

1958

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

1959

network.ifr_flags |= IFF_UP;

1960

take_down_interface = true;

1961

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

1962

if(ret == -1){

1963

take_down_interface = false;

1964

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1965

exitcode = EX_OSERR;

1966

#ifdef __linux__

1967

if(restore_loglevel){

1968

ret = klogctl(7, NULL, 0);

1969

if(ret == -1){

1970

perror_plus("klogctl");

2694

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

2695

if(mc.interfaces == NULL){

2696

struct dirent **direntries = NULL;

2697

/* Look for any good interfaces */

2698

ret = scandir(sys_class_net, &direntries, good_interface,

2699

alphasort);

2700

if(ret >= 1){

2701

/* Add all found interfaces to interfaces list */

2702

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

2703

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

2704

direntries[i]->d_name);

2705

if(ret_errno != 0){

2706

errno = ret_errno;

2707

perror_plus("argz_add");

2708

free(direntries[i]);

2709

continue;

2710

}

2711

if(debug){

2712

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

2713

direntries[i]->d_name);

2714

}

2715

free(direntries[i]);

2716

}

2717

free(direntries);

2718

} else {

2719

if(ret == 0){

2720

free(direntries);

2721

}

2722

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

2723

exitcode = EXIT_FAILURE;

2724

goto end;

2725

}

2726

}

2727

2728

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

2729

{

2730

char *interface = NULL;

2731

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

2732

interface))){

2733

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

2734

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

2735

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

2736

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

2737

interface);

2738

interface = NULL;

2739

while((interface = argz_next(mc.interfaces,

2740

mc.interfaces_size, interface))){

2741

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

2742

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

2743

interface);

2744

interface = NULL;

1971

2745

}

1972

2746

}

1973

#endif /* __linux__ */

1974

/* Lower privileges */

1975

errno = 0;

1976

ret = seteuid(uid);

1977

if(ret == -1){

1978

perror_plus("seteuid");

1979

}

1980

goto end;

1981

}

1982

}

1983

/* Sleep checking until interface is running.

1984

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

1985

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

1986

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

1987

if(ret == -1){

1988

perror_plus("ioctl SIOCGIFFLAGS");

1989

} else if(network.ifr_flags & IFF_RUNNING){

1990

2747

break;

1991

2748

}

1992

struct timespec sleeptime = { .tv_nsec = 250000000 };

1993

ret = nanosleep(&sleeptime, NULL);

1994

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

1995

perror_plus("nanosleep");

1996

}

1997

}

1998

if(not take_down_interface){

1999

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

2000

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

2001

if(ret == -1){

2002

perror_plus("close");

2003

}

2004

}

2005

#ifdef __linux__

2006

if(restore_loglevel){

2007

/* Restores kernel loglevel to default */

2008

ret = klogctl(7, NULL, 0);

2009

if(ret == -1){

2010

perror_plus("klogctl");

2011

}

2012

}

2013

#endif /* __linux__ */

2014

/* Lower privileges */

2015

errno = 0;

2016

/* Lower privileges */

2017

ret = seteuid(uid);

2018

if(ret == -1){

2019

perror_plus("seteuid");

2020

}

2749

bool interface_was_up = interface_is_up(interface);

2750

errno = bring_up_interface(interface, delay);

2751

if(not interface_was_up){

2752

if(errno != 0){

2753

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

2754

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

2755

} else {

2756

errno = argz_add(&interfaces_to_take_down,

2757

&interfaces_to_take_down_size,

2758

interface);

2759

if(errno != 0){

2760

perror_plus("argz_add");

2761

}

2762

}

2763

}

2764

}

2765

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

2766

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

2767

}

2768

}

2769

2770

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

2771

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

2772

if(debug){

2773

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

2774

mc.interfaces);

2775

}

2776

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

2021

2777

}

2022

2778

2023

2779

if(quit_now){

2024

2780

goto end;

2025

2781

}

2026

2782

2027

ret = init_gnutls_global(pubkey, seckey);

2783

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

2028

2784

if(ret == -1){

2029

2785

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

2030

2786

exitcode = EX_UNAVAILABLE;

2037

2793

goto end;

2038

2794

}

2039

2795

2040

if(mkdtemp(tempdir) == NULL){

2796

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

2797

tempdir = mkdtemp(run_tempdir);

2798

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

2799

if(debug){

2800

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

2801

run_tempdir, old_tempdir);

2802

}

2803

tempdir = mkdtemp(old_tempdir);

2804

}

2805

if(tempdir == NULL){

2041

2806

perror_plus("mkdtemp");

2042

2807

goto end;

2043

2808

}

2044

tempdir_created = true;

2045

2809

2046

2810

if(quit_now){

2047

2811

goto end;

2048

2812

}

2049

2813

2050

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

2814

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

2051

2815

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

2052

2816

exitcode = EX_UNAVAILABLE;

2053

2817

goto end;

2063

2827

/* Connect directly, do not use Zeroconf */

2064

2828

/* (Mainly meant for debugging) */

2065

2829

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

2830

2066

2831

if(address == NULL){

2067

2832

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

2068

2833

exitcode = EX_USAGE;

2073

2838

goto end;

2074

2839

}

2075

2840

2076

uint16_t port;

2841

in_port_t port;

2077

2842

errno = 0;

2078

2843

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

2079

2844

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

2080

or tmpmax != (uint16_t)tmpmax){

2845

or tmpmax != (in_port_t)tmpmax){

2081

2846

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

2082

2847

exitcode = EX_USAGE;

2083

2848

goto end;

2084

2849

}

2085

2850

2086

2851

if(quit_now){

2087

2852

goto end;

2088

2853

}

2089

2854

2090

port = (uint16_t)tmpmax;

2855

port = (in_port_t)tmpmax;

2091

2856

*address = '\0';

2092

2857

/* Colon in address indicates IPv6 */

2093

2858

int af;

2109

2874

}

2110

2875

2111

2876

while(not quit_now){

2112

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

2877

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

2878

&mc);

2113

2879

if(quit_now or ret == 0){

2114

2880

break;

2115

2881

}

2117

2883

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

2118

2884

(int)retry_interval);

2119

2885

}

2120

sleep((int)retry_interval);

2886

sleep((unsigned int)retry_interval);

2121

2887

}

2122

2888

2123

if (not quit_now){

2889

if(not quit_now){

2124

2890

exitcode = EXIT_SUCCESS;

2125

2891

}

2126

2892

2141

2907

config.publish_domain = 0;

2142

2908

2143

2909

/* Allocate a new server */

2144

mc.server = avahi_server_new(avahi_simple_poll_get

2145

(mc.simple_poll), &config, NULL,

2146

NULL, &error);

2910

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2911

&config, NULL, NULL, &ret_errno);

2147

2912

2148

2913

/* Free the Avahi configuration data */

2149

2914

avahi_server_config_free(&config);

2152

2917

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

2153

2918

if(mc.server == NULL){

2154

2919

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

2155

avahi_strerror(error));

2920

avahi_strerror(ret_errno));

2156

2921

exitcode = EX_UNAVAILABLE;

2157

2922

goto end;

2158

2923

}

2164

2929

/* Create the Avahi service browser */

2165

2930

sb = avahi_s_service_browser_new(mc.server, if_index,

2166

2931

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2167

NULL, 0, browse_callback, NULL);

2932

NULL, 0, browse_callback,

2933

(void *)&mc);

2168

2934

if(sb == NULL){

2169

2935

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

2170

2936

avahi_strerror(avahi_server_errno(mc.server)));

2181

2947

if(debug){

2182

2948

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

2183

2949

}

2184

2185

ret = avahi_loop_with_timeout(mc.simple_poll,

2186

(int)(retry_interval * 1000));

2950

2951

ret = avahi_loop_with_timeout(simple_poll,

2952

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

2187

2953

if(debug){

2188

2954

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

2189

2955

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

2196

2962

}

2197

2963

2198

2964

/* Cleanup things */

2965

free(mc.interfaces);

2966

2199

2967

if(sb != NULL)

2200

2968

avahi_s_service_browser_free(sb);

2201

2969

2202

2970

if(mc.server != NULL)

2203

2971

avahi_server_free(mc.server);

2204

2972

2205

if(mc.simple_poll != NULL)

2206

avahi_simple_poll_free(mc.simple_poll);

2973

if(simple_poll != NULL)

2974

avahi_simple_poll_free(simple_poll);

2207

2975

2208

2976

if(gnutls_initialized){

2209

2977

gnutls_certificate_free_credentials(mc.cred);

2221

2989

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

2222

2990

while(mc.current_server != NULL){

2223

2991

server *next = mc.current_server->next;

2992

#ifdef __GNUC__

2993

#pragma GCC diagnostic push

2994

#pragma GCC diagnostic ignored "-Wcast-qual"

2995

#endif

2996

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

2997

#ifdef __GNUC__

2998

#pragma GCC diagnostic pop

2999

#endif

2224

3000

free(mc.current_server);

2225

3001

mc.current_server = next;

2226

3002

}

2227

3003

}

2228

3004

2229

/* Run network hooks */

2230

run_network_hooks("stop", interface, delay);

2231

2232

/* Re-raise priviliges */

3005

/* Re-raise privileges */

2233

3006

{

2234

errno = 0;

2235

ret = seteuid(0);

2236

if(ret == -1){

2237

perror_plus("seteuid");

3007

ret_errno = raise_privileges();

3008

if(ret_errno != 0){

3009

errno = ret_errno;

3010

perror_plus("Failed to raise privileges");

3011

} else {

3012

3013

/* Run network hooks */

3014

run_network_hooks("stop", interfaces_hooks != NULL ?

3015

interfaces_hooks : "", delay);

3016

3017

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

3018

{

3019

char *interface = NULL;

3020

while((interface=argz_next(interfaces_to_take_down,

3021

interfaces_to_take_down_size,

3022

interface))){

3023

ret_errno = take_down_interface(interface);

3024

if(ret_errno != 0){

3025

errno = ret_errno;

3026

perror_plus("Failed to take down interface");

3027

}

3028

}

3029

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

3030

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

3031

" down\n");

3032

}

3033

}

2238

3034

}

2239

3035

2240

/* Take down the network interface */

2241

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

2242

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

2243

if(ret == -1){

2244

perror_plus("ioctl SIOCGIFFLAGS");

2245

} else if(network.ifr_flags & IFF_UP){

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2250

}

2251

}

2252

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

2253

if(ret == -1){

2254

perror_plus("close");

2255

}

3036

ret_errno = lower_privileges_permanently();

3037

if(ret_errno != 0){

3038

errno = ret_errno;

3039

perror_plus("Failed to lower privileges permanently");

2256

3040

}

2257

3041

}

2258

/* Lower privileges permanently */

2259

errno = 0;

2260

ret = setuid(uid);

2261

if(ret == -1){

2262

perror_plus("setuid");

2263

}

3042

3043

free(interfaces_to_take_down);

3044

free(interfaces_hooks);

2264

3045

2265

3046

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

2266

if(tempdir_created){

3047

if(tempdir != NULL){

2267

3048

struct dirent **direntries = NULL;

2268

struct dirent *direntry = NULL;

2269

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

2270

alphasort);

2271

if (numentries > 0){

2272

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

2273

direntry = direntries[i];

2274

char *fullname = NULL;

2275

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

2276

direntry->d_name);

2277

if(ret < 0){

2278

perror_plus("asprintf");

2279

continue;

2280

}

2281

ret = remove(fullname);

2282

if(ret == -1){

2283

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

2284

strerror(errno));

2285

}

2286

free(fullname);

3049

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

3050

| O_NOFOLLOW

3051

| O_DIRECTORY

3052

| O_PATH));

3053

if(tempdir_fd == -1){

3054

perror_plus("open");

3055

} else {

3056

#ifdef __GLIBC__

3057

#if __GLIBC_PREREQ(2, 15)

3058

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

3059

notdotentries, alphasort);

3060

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

3061

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

3062

alphasort);

3063

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

3064

#else /* not __GLIBC__ */

3065

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

3066

alphasort);

3067

#endif /* not __GLIBC__ */

3068

if(numentries >= 0){

3069

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

3070

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

3071

if(ret == -1){

3072

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

3073

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

3074

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

3075

}

3076

free(direntries[i]);

3077

}

3078

3079

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

3080

free(direntries);

3081

if(numentries == -1){

3082

perror_plus("scandir");

3083

}

3084

ret = rmdir(tempdir);

3085

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

3086

perror_plus("rmdir");

3087

}

2287

3088

}

2288

}

2289

2290

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

2291

free(direntries);

2292

if (numentries == -1){

2293

perror_plus("scandir");

2294

}

2295

ret = rmdir(tempdir);

2296

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

2297

perror_plus("rmdir");

3089

close(tempdir_fd);

2298

3090

}

2299

3091

}

2300

3092