/mandos/release : revision 237.7.322

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

38

#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(),

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asprintf(), strcpy() */

51

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

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

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sockaddr_in6, PF_INET6,

55

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(),

77

unlinkat() */

78

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

78

79

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

79

80

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

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

178

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

188

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

179

189

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

180

190

va_list ap;

181

191

va_start (ap, format);

182

192

183

193

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

184

194

program_invocation_short_name));

185

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

195

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

186

196

}

187

197

188

198

/*

190

200

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

191

201

* "buffer_length" is how much is already used.

192

202

*/

203

__attribute__((nonnull, warn_unused_result))

193

204

size_t incbuffer(char **buffer, size_t buffer_length,

194

205

size_t buffer_capacity){

195

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

196

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

197

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;

198

213

return 0;

199

214

}

215

*buffer = new_buf;

200

216

buffer_capacity += BUFFER_SIZE;

201

217

}

202

218

return buffer_capacity;

203

219

}

204

220

205

221

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

206

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

207

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){

208

225

int ret;

209

226

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

210

227

if(new_server == NULL){

217

234

.af = af };

218

235

if(new_server->ip == NULL){

219

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);

220

252

return false;

221

253

}

222

254

/* Special case of first server */

223

if (mc.current_server == NULL){

255

if(*current_server == NULL){

224

256

new_server->next = new_server;

225

257

new_server->prev = new_server;

226

mc.current_server = new_server;

227

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

258

*current_server = new_server;

228

259

} else {

229

new_server->next = mc.current_server;

230

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;

231

263

new_server->prev->next = new_server;

232

mc.current_server->prev = new_server;

233

}

234

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

235

if(ret == -1){

236

perror_plus("clock_gettime");

237

return false;

264

(*current_server)->prev = new_server;

238

265

}

239

266

return true;

240

267

}

242

269

/*

243

270

* Initialize GPGME.

244

271

*/

245

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

246

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){

247

277

gpgme_error_t rc;

248

278

gpgme_engine_info_t engine_info;

249

279

250

251

280

/*

252

281

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

253

282

*/

254

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

255

284

int ret;

256

285

int fd;

257

286

gpgme_data_t pgp_data;

269

298

return false;

270

299

}

271

300

272

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

273

302

if(rc != GPG_ERR_NO_ERROR){

274

303

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

275

304

gpgme_strsource(rc), gpgme_strerror(rc));

276

305

return false;

277

306

}

278

307

279

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

308

ret = close(fd);

280

309

if(ret == -1){

281

310

perror_plus("close");

282

311

}

319

348

}

320

349

321

350

/* Create new GPGME "context" */

322

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

351

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

323

352

if(rc != GPG_ERR_NO_ERROR){

324

353

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

325

354

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

338

367

* Decrypt OpenPGP data.

339

368

* Returns -1 on error

340

369

*/

370

__attribute__((nonnull, warn_unused_result))

341

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

342

372

size_t crypto_size,

343

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

344

375

gpgme_data_t dh_crypto, dh_plain;

345

376

gpgme_error_t rc;

346

377

ssize_t ret;

372

403

373

404

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

374

405

data buffer */

375

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

406

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

376

407

if(rc != GPG_ERR_NO_ERROR){

377

408

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

378

409

gpgme_strsource(rc), gpgme_strerror(rc));

379

410

plaintext_length = -1;

380

411

if(debug){

381

412

gpgme_decrypt_result_t result;

382

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

383

414

if(result == NULL){

384

415

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

385

416

} else {

462

493

return plaintext_length;

463

494

}

464

495

465

static const char * safer_gnutls_strerror(int value){

466

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

467

-Wunreachable-code */

468

if(ret == NULL)

469

ret = "(unknown)";

470

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);

471

507

}

472

508

473

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

474

511

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

475

512

const char* string){

476

513

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

477

514

}

478

515

516

__attribute__((nonnull, warn_unused_result))

479

517

static int init_gnutls_global(const char *pubkeyfilename,

480

const char *seckeyfilename){

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

481

521

int ret;

522

unsigned int uret;

482

523

483

524

if(debug){

484

525

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

500

541

}

501

542

502

543

/* OpenPGP credentials */

503

ret = gnutls_certificate_allocate_credentials(&mc.cred);

544

ret = gnutls_certificate_allocate_credentials(&mc->cred);

504

545

if(ret != GNUTLS_E_SUCCESS){

505

546

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

506

547

safer_gnutls_strerror(ret));

516

557

}

517

558

518

559

ret = gnutls_certificate_set_openpgp_key_file

519

(mc.cred, pubkeyfilename, seckeyfilename,

560

(mc->cred, pubkeyfilename, seckeyfilename,

520

561

GNUTLS_OPENPGP_FMT_BASE64);

521

562

if(ret != GNUTLS_E_SUCCESS){

522

563

fprintf_plus(stderr,

528

569

}

529

570

530

571

/* GnuTLS server initialization */

531

ret = gnutls_dh_params_init(&mc.dh_params);

572

ret = gnutls_dh_params_init(&mc->dh_params);

532

573

if(ret != GNUTLS_E_SUCCESS){

533

574

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

534

575

" initialization: %s\n",

535

576

safer_gnutls_strerror(ret));

536

577

goto globalfail;

537

578

}

538

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

539

if(ret != GNUTLS_E_SUCCESS){

540

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

541

safer_gnutls_strerror(ret));

542

goto globalfail;

543

}

544

545

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);

546

752

547

753

return 0;

548

754

549

755

globalfail:

550

756

551

gnutls_certificate_free_credentials(mc.cred);

757

gnutls_certificate_free_credentials(mc->cred);

552

758

gnutls_global_deinit();

553

gnutls_dh_params_deinit(mc.dh_params);

759

gnutls_dh_params_deinit(mc->dh_params);

554

760

return -1;

555

761

}

556

762

557

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){

558

766

int ret;

559

767

/* GnuTLS session creation */

560

768

do {

572

780

{

573

781

const char *err;

574

782

do {

575

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

783

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

576

784

if(quit_now){

577

785

gnutls_deinit(*session);

578

786

return -1;

589

797

590

798

do {

591

799

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

592

mc.cred);

800

mc->cred);

593

801

if(quit_now){

594

802

gnutls_deinit(*session);

595

803

return -1;

605

813

/* ignore client certificate if any. */

606

814

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

607

815

608

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

609

610

816

return 0;

611

817

}

612

818

614

820

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

615

821

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

616

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

_exit(EX_UNAVAILABLE);

958

}

959

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

617

1040

/* Called when a Mandos server is found */

618

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

1041

__attribute__((nonnull, warn_unused_result))

1042

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

619

1043

AvahiIfIndex if_index,

620

int af){

1044

int af, mandos_context *mc){

621

1045

int ret, tcp_sd = -1;

622

1046

ssize_t sret;

623

union {

624

struct sockaddr_in in;

625

struct sockaddr_in6 in6;

626

} to;

1047

struct sockaddr_storage to;

627

1048

char *buffer = NULL;

628

1049

char *decrypted_buffer = NULL;

629

1050

size_t buffer_length = 0;

632

1053

int retval = -1;

633

1054

gnutls_session_t session;

634

1055

int pf; /* Protocol family */

1056

bool route_added = false;

635

1057

636

1058

errno = 0;

637

1059

653

1075

return -1;

654

1076

}

655

1077

656

ret = init_gnutls_session(&session);

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);

657

1111

if(ret != 0){

658

1112

return -1;

659

1113

}

660

1114

661

1115

if(debug){

662

1116

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

663

PRIu16 "\n", ip, port);

1117

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

664

1118

}

665

1119

666

tcp_sd = socket(pf, SOCK_STREAM, 0);

1120

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

667

1121

if(tcp_sd < 0){

668

1122

int e = errno;

669

1123

perror_plus("socket");

676

1130

goto mandos_end;

677

1131

}

678

1132

679

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

680

1133

if(af == AF_INET6){

681

to.in6.sin6_family = (sa_family_t)af;

682

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

1134

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

1135

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

1136

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

683

1137

} else { /* IPv4 */

684

to.in.sin_family = (sa_family_t)af;

685

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

1138

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

1139

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

1140

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

686

1141

}

687

1142

if(ret < 0 ){

688

1143

int e = errno;

697

1152

goto mandos_end;

698

1153

}

699

1154

if(af == AF_INET6){

700

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

701

-Wconversion and

702

-Wunreachable-code */

703

704

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

705

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

706

-Wunreachable-code*/

1155

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

1156

if(IN6_IS_ADDR_LINKLOCAL

1157

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

707

1158

if(if_index == AVAHI_IF_UNSPEC){

708

1159

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

709

1160

" incomplete without a network interface\n");

711

1162

goto mandos_end;

712

1163

}

713

1164

/* Set the network interface number as scope */

714

to.in6.sin6_scope_id = (uint32_t)if_index;

1165

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

715

1166

}

716

1167

} else {

717

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

718

-Wconversion and

719

-Wunreachable-code */

1168

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

720

1169

}

721

1170

722

1171

if(quit_now){

730

1179

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

731

1180

perror_plus("if_indextoname");

732

1181

} else {

733

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

734

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

1182

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

1183

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

735

1184

}

736

1185

} else {

737

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

738

ip, port);

1186

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

1187

ip, (uintmax_t)port);

739

1188

}

740

1189

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

741

1190

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

742

const char *pcret;

743

if(af == AF_INET6){

744

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

745

sizeof(addrstr));

746

} else {

747

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

748

sizeof(addrstr));

749

}

750

if(pcret == NULL){

751

perror_plus("inet_ntop");

752

} else {

753

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

754

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

755

}

756

}

757

}

758

759

if(quit_now){

760

errno = EINTR;

761

goto mandos_end;

762

}

763

764

if(af == AF_INET6){

765

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

766

} else {

767

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

768

}

769

if(ret < 0){

770

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

771

int e = errno;

772

perror_plus("connect");

773

errno = e;

774

}

775

goto mandos_end;

776

}

777

778

if(quit_now){

779

errno = EINTR;

780

goto mandos_end;

1191

if(af == AF_INET6){

1192

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

1193

sizeof(struct sockaddr_in6),

1194

addrstr, sizeof(addrstr), NULL, 0,

1195

NI_NUMERICHOST);

1196

} else {

1197

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

1198

sizeof(struct sockaddr_in),

1199

addrstr, sizeof(addrstr), NULL, 0,

1200

NI_NUMERICHOST);

1201

}

1202

if(ret == EAI_SYSTEM){

1203

perror_plus("getnameinfo");

1204

} else if(ret != 0) {

1205

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

1206

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

1207

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

1208

}

1209

}

1210

1211

if(quit_now){

1212

errno = EINTR;

1213

goto mandos_end;

1214

}

1215

1216

while(true){

1217

if(af == AF_INET6){

1218

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

1219

sizeof(struct sockaddr_in6));

1220

} else {

1221

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

1222

sizeof(struct sockaddr_in));

1223

}

1224

if(ret < 0){

1225

if(errno == ENETUNREACH

1226

and if_index != AVAHI_IF_UNSPEC

1227

and connect_to == NULL

1228

and not route_added and

1229

((af == AF_INET6 and not

1230

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1231

&to)->sin6_addr)))

1232

or (af == AF_INET and

1233

/* Not a a IPv4LL address */

1234

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

1235

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

1236

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

1237

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

1238

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

1239

connect to a Mandos server announced by Avahi on a server

1240

host with a global address. Work around this by retrying

1241

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

1242

1243

Avahi bug reference:

1244

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

1245

https://bugs.debian.org/587961

1246

*/

1247

if(debug){

1248

fprintf_plus(stderr, "Mandos server unreachable, trying"

1249

" direct route\n");

1250

}

1251

int e = errno;

1252

route_added = add_local_route(ip, if_index);

1253

if(route_added){

1254

continue;

1255

}

1256

errno = e;

1257

}

1258

if(errno != ECONNREFUSED or debug){

1259

int e = errno;

1260

perror_plus("connect");

1261

errno = e;

1262

}

1263

goto mandos_end;

1264

}

1265

1266

if(quit_now){

1267

errno = EINTR;

1268

goto mandos_end;

1269

}

1270

break;

781

1271

}

782

1272

783

1273

const char *out = mandos_protocol_version;

819

1309

goto mandos_end;

820

1310

}

821

1311

822

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

823

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1312

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

1313

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

1314

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

1315

gnutls_transport_set_ptr(session,

1316

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

824

1317

825

1318

if(quit_now){

826

1319

errno = EINTR;

931

1424

if(buffer_length > 0){

932

1425

ssize_t decrypted_buffer_size;

933

1426

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

934

&decrypted_buffer);

1427

&decrypted_buffer, mc);

935

1428

if(decrypted_buffer_size >= 0){

936

1429

937

1430

written = 0;

963

1456

964

1457

mandos_end:

965

1458

{

1459

if(route_added){

1460

if(not delete_local_route(ip, if_index)){

1461

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

1462

" interface %d", ip, if_index);

1463

}

1464

}

966

1465

int e = errno;

967

1466

free(decrypted_buffer);

968

1467

free(buffer);

969

1468

if(tcp_sd >= 0){

970

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

1469

ret = close(tcp_sd);

971

1470

}

972

1471

if(ret == -1){

973

1472

if(e == 0){

985

1484

return retval;

986

1485

}

987

1486

1487

__attribute__((nonnull))

988

1488

static void resolve_callback(AvahiSServiceResolver *r,

989

1489

AvahiIfIndex interface,

990

1490

AvahiProtocol proto,

998

1498

AVAHI_GCC_UNUSED AvahiStringList *txt,

999

1499

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1000

1500

flags,

1001

AVAHI_GCC_UNUSED void* userdata){

1002

assert(r);

1501

void *mc){

1502

if(r == NULL){

1503

return;

1504

}

1003

1505

1004

1506

/* Called whenever a service has been resolved successfully or

1005

1507

timed out */

1006

1508

1007

1509

if(quit_now){

1510

avahi_s_service_resolver_free(r);

1008

1511

return;

1009

1512

}

1010

1513

1014

1517

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

1015

1518

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

1016

1519

domain,

1017

avahi_strerror(avahi_server_errno(mc.server)));

1520

avahi_strerror(avahi_server_errno

1521

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

1018

1522

break;

1019

1523

1020

1524

case AVAHI_RESOLVER_FOUND:

1026

1530

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

1027

1531

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

1028

1532

}

1029

int ret = start_mandos_communication(ip, port, interface,

1030

avahi_proto_to_af(proto));

1533

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

1534

interface,

1535

avahi_proto_to_af(proto),

1536

mc);

1031

1537

if(ret == 0){

1032

avahi_simple_poll_quit(mc.simple_poll);

1538

avahi_simple_poll_quit(simple_poll);

1033

1539

} else {

1034

if(not add_server(ip, port, interface,

1035

avahi_proto_to_af(proto))){

1540

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

1541

avahi_proto_to_af(proto),

1542

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

1036

1543

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

1037

1544

" list\n", name);

1038

1545

}

1051

1558

const char *domain,

1052

1559

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1053

1560

flags,

1054

AVAHI_GCC_UNUSED void* userdata){

1055

assert(b);

1561

void *mc){

1562

if(b == NULL){

1563

return;

1564

}

1056

1565

1057

1566

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

1058

1567

is removed from the LAN */

1066

1575

case AVAHI_BROWSER_FAILURE:

1067

1576

1068

1577

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

1069

avahi_strerror(avahi_server_errno(mc.server)));

1070

avahi_simple_poll_quit(mc.simple_poll);

1578

avahi_strerror(avahi_server_errno

1579

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

1580

avahi_simple_poll_quit(simple_poll);

1071

1581

return;

1072

1582

1073

1583

case AVAHI_BROWSER_NEW:

1076

1586

the callback function is called the Avahi server will free the

1077

1587

resolver for us. */

1078

1588

1079

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

1080

name, type, domain, protocol, 0,

1081

resolve_callback, NULL) == NULL)

1589

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

1590

interface, protocol, name, type,

1591

domain, protocol, 0,

1592

resolve_callback, mc) == NULL)

1082

1593

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

1083

1594

" %s\n", name,

1084

avahi_strerror(avahi_server_errno(mc.server)));

1595

avahi_strerror(avahi_server_errno

1596

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

1085

1597

break;

1086

1598

1087

1599

case AVAHI_BROWSER_REMOVE:

1106

1618

signal_received = sig;

1107

1619

int old_errno = errno;

1108

1620

/* set main loop to exit */

1109

if(mc.simple_poll != NULL){

1110

avahi_simple_poll_quit(mc.simple_poll);

1621

if(simple_poll != NULL){

1622

avahi_simple_poll_quit(simple_poll);

1111

1623

}

1112

1624

errno = old_errno;

1113

1625

}

1114

1626

1627

__attribute__((nonnull, warn_unused_result))

1115

1628

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

1116

1629

int ret;

1630

error_t ret_errno;

1117

1631

1118

1632

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

1119

1633

if(s < 0){

1634

ret_errno = errno;

1120

1635

perror_plus("socket");

1636

errno = ret_errno;

1121

1637

return false;

1122

1638

}

1123

1639

strcpy(ifr->ifr_name, ifname);

1124

1640

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1125

1641

if(ret == -1){

1126

1642

if(debug){

1643

ret_errno = errno;

1127

1644

perror_plus("ioctl SIOCGIFFLAGS");

1645

errno = ret_errno;

1128

1646

}

1129

1647

return false;

1130

1648

}

1131

1649

return true;

1132

1650

}

1133

1651

1652

__attribute__((nonnull, warn_unused_result))

1134

1653

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

1135

1654

1136

1655

/* Reject the loopback device */

1178

1697

* corresponds to an acceptable network device.

1179

1698

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

1180

1699

*/

1700

__attribute__((nonnull, warn_unused_result))

1181

1701

int good_interface(const struct dirent *if_entry){

1182

1702

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

1183

1703

return 0;

1199

1719

}

1200

1720

1201

1721

/*

1202

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

1203

* corresponds to an acceptable network device which is up.

1204

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

1205

*/

1206

int up_interface(const struct dirent *if_entry){

1207

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

1208

return 0;

1209

}

1210

1211

struct ifreq ifr;

1212

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

1213

if(debug){

1214

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

1215

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

1216

}

1217

return 0;

1218

}

1219

1220

/* Reject down interfaces */

1221

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

1222

if(debug){

1223

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

1224

if_entry->d_name);

1225

}

1226

return 0;

1227

}

1228

1229

/* Reject non-running interfaces */

1230

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

1231

if(debug){

1232

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

1233

if_entry->d_name);

1234

}

1235

return 0;

1236

}

1237

1238

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

1239

return 0;

1240

}

1241

return 1;

1242

}

1243

1722

* This function determines if a network interface is up.

1723

*/

1724

__attribute__((nonnull, warn_unused_result))

1725

bool interface_is_up(const char *interface){

1726

struct ifreq ifr;

1727

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

1728

if(debug){

1729

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

1730

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

1731

}

1732

return false;

1733

}

1734

1735

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

1736

}

1737

1738

/*

1739

* This function determines if a network interface is running

1740

*/

1741

__attribute__((nonnull, warn_unused_result))

1742

bool interface_is_running(const char *interface){

1743

struct ifreq ifr;

1744

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

1745

if(debug){

1746

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

1747

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

1748

}

1749

return false;

1750

}

1751

1752

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

1753

}

1754

1755

__attribute__((nonnull, pure, warn_unused_result))

1244

1756

int notdotentries(const struct dirent *direntry){

1245

1757

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

1246

1758

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

1253

1765

}

1254

1766

1255

1767

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

1768

__attribute__((nonnull, warn_unused_result))

1256

1769

int runnable_hook(const struct dirent *direntry){

1257

1770

int ret;

1258

1771

size_t sret;

1266

1779

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

1267

1780

"abcdefghijklmnopqrstuvwxyz"

1268

1781

"0123456789"

1269

"_-");

1782

"_.-");

1270

1783

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

1271

1784

/* Contains non-allowed characters */

1272

1785

if(debug){

1276

1789

return 0;

1277

1790

}

1278

1791

1279

char *fullname = NULL;

1280

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

1281

if(ret < 0){

1282

perror_plus("asprintf");

1283

return 0;

1284

}

1285

1286

ret = stat(fullname, &st);

1792

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

1287

1793

if(ret == -1){

1288

1794

if(debug){

1289

1795

perror_plus("Could not stat hook");

1313

1819

return 1;

1314

1820

}

1315

1821

1316

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1822

__attribute__((nonnull, warn_unused_result))

1823

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1824

mandos_context *mc){

1317

1825

int ret;

1318

1826

struct timespec now;

1319

1827

struct timespec waited_time;

1320

1828

intmax_t block_time;

1321

1829

1322

1830

while(true){

1323

if(mc.current_server == NULL){

1324

if (debug){

1831

if(mc->current_server == NULL){

1832

if(debug){

1325

1833

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

1326

1834

" No timeout!\n");

1327

1835

}

1328

1836

ret = avahi_simple_poll_iterate(s, -1);

1329

1837

} else {

1330

if (debug){

1838

if(debug){

1331

1839

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

1332

1840

" it, or wait\n");

1333

1841

}

1340

1848

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

1341

1849

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

1342

1850

waited_time.tv_sec = (now.tv_sec

1343

- mc.current_server->last_seen.tv_sec);

1851

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

1344

1852

waited_time.tv_nsec = (now.tv_nsec

1345

- mc.current_server->last_seen.tv_nsec);

1853

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

1346

1854

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

1347

1855

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

1348

1856

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

1350

1858

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

1351

1859

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

1352

1860

1353

if (debug){

1861

if(debug){

1354

1862

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

1355

1863

block_time);

1356

1864

}

1357

1865

1358

1866

if(block_time <= 0){

1359

ret = start_mandos_communication(mc.current_server->ip,

1360

mc.current_server->port,

1361

mc.current_server->if_index,

1362

mc.current_server->af);

1867

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

1868

mc->current_server->port,

1869

mc->current_server->if_index,

1870

mc->current_server->af, mc);

1363

1871

if(ret == 0){

1364

avahi_simple_poll_quit(mc.simple_poll);

1872

avahi_simple_poll_quit(s);

1365

1873

return 0;

1366

1874

}

1367

1875

ret = clock_gettime(CLOCK_MONOTONIC,

1368

&mc.current_server->last_seen);

1876

&mc->current_server->last_seen);

1369

1877

if(ret == -1){

1370

1878

perror_plus("clock_gettime");

1371

1879

return -1;

1372

1880

}

1373

mc.current_server = mc.current_server->next;

1881

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

1374

1882

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

1375

1883

servers, but don't block */

1376

1884

}

1378

1886

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

1379

1887

}

1380

1888

if(ret != 0){

1381

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

1889

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

1382

1890

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

1383

1891

}

1384

1892

}

1385

1893

}

1386

1894

}

1387

1895

1388

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

1896

__attribute__((nonnull))

1897

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

1389

1898

const float delay){

1390

struct dirent **direntries;

1391

struct dirent *direntry;

1392

int ret;

1393

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

1394

alphasort);

1899

struct dirent **direntries = NULL;

1900

if(hookdir_fd == -1){

1901

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1902

| O_CLOEXEC);

1903

if(hookdir_fd == -1){

1904

if(errno == ENOENT){

1905

if(debug){

1906

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

1907

" found\n", hookdir);

1908

}

1909

} else {

1910

perror_plus("open");

1911

}

1912

return;

1913

}

1914

}

1915

#ifdef __GLIBC__

1916

#if __GLIBC_PREREQ(2, 15)

1917

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

1918

runnable_hook, alphasort);

1919

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

1920

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

1921

alphasort);

1922

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

1923

#else /* not __GLIBC__ */

1924

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

1925

alphasort);

1926

#endif /* not __GLIBC__ */

1395

1927

if(numhooks == -1){

1396

1928

perror_plus("scandir");

1397

} else {

1398

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

1399

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

1400

direntry = direntries[i];

1401

char *fullname = NULL;

1402

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

1403

if(ret < 0){

1929

return;

1930

}

1931

struct dirent *direntry;

1932

int ret;

1933

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

1934

if(devnull == -1){

1935

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

1936

return;

1937

}

1938

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

1939

direntry = direntries[i];

1940

if(debug){

1941

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

1942

direntry->d_name);

1943

}

1944

pid_t hook_pid = fork();

1945

if(hook_pid == 0){

1946

/* Child */

1947

/* Raise privileges */

1948

errno = raise_privileges_permanently();

1949

if(errno != 0){

1950

perror_plus("Failed to raise privileges");

1951

_exit(EX_NOPERM);

1952

}

1953

/* Set group */

1954

errno = 0;

1955

ret = setgid(0);

1956

if(ret == -1){

1957

perror_plus("setgid");

1958

_exit(EX_NOPERM);

1959

}

1960

/* Reset supplementary groups */

1961

errno = 0;

1962

ret = setgroups(0, NULL);

1963

if(ret == -1){

1964

perror_plus("setgroups");

1965

_exit(EX_NOPERM);

1966

}

1967

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

1968

if(ret == -1){

1969

perror_plus("setenv");

1970

_exit(EX_OSERR);

1971

}

1972

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

1973

if(ret == -1){

1974

perror_plus("setenv");

1975

_exit(EX_OSERR);

1976

}

1977

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

1978

if(ret == -1){

1979

perror_plus("setenv");

1980

_exit(EX_OSERR);

1981

}

1982

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

1983

if(ret == -1){

1984

perror_plus("setenv");

1985

_exit(EX_OSERR);

1986

}

1987

char *delaystring;

1988

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

1989

if(ret == -1){

1404

1990

perror_plus("asprintf");

1405

continue;

1406

}

1407

if(debug){

1408

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

1409

direntry->d_name);

1410

}

1411

pid_t hook_pid = fork();

1412

if(hook_pid == 0){

1413

/* Child */

1414

/* Raise privileges */

1415

errno = 0;

1416

ret = seteuid(0);

1417

if(ret == -1){

1418

perror_plus("seteuid");

1419

}

1420

/* Raise privileges even more */

1421

errno = 0;

1422

ret = setuid(0);

1423

if(ret == -1){

1424

perror_plus("setuid");

1425

}

1426

/* Set group */

1427

errno = 0;

1428

ret = setgid(0);

1429

if(ret == -1){

1430

perror_plus("setgid");

1431

}

1432

/* Reset supplementary groups */

1433

errno = 0;

1434

ret = setgroups(0, NULL);

1435

if(ret == -1){

1436

perror_plus("setgroups");

1437

}

1438

dup2(devnull, STDIN_FILENO);

1439

close(devnull);

1440

dup2(STDERR_FILENO, STDOUT_FILENO);

1441

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

1442

if(ret == -1){

1443

perror_plus("setenv");

1444

_exit(EX_OSERR);

1445

}

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

char *delaystring;

1462

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

1463

if(ret == -1){

1464

perror_plus("asprintf");

1465

_exit(EX_OSERR);

1466

}

1467

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

1468

if(ret == -1){

1469

free(delaystring);

1470

perror_plus("setenv");

1471

_exit(EX_OSERR);

1472

}

1991

_exit(EX_OSERR);

1992

}

1993

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

1994

if(ret == -1){

1473

1995

free(delaystring);

1474

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

1475

perror_plus("execl");

1476

_exit(EXIT_FAILURE);

1477

}

1478

} else {

1479

int status;

1480

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

1481

perror_plus("waitpid");

1482

free(fullname);

1483

continue;

1484

}

1485

if(WIFEXITED(status)){

1486

if(WEXITSTATUS(status) != 0){

1487

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

1488

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

1489

WEXITSTATUS(status));

1490

free(fullname);

1491

continue;

1492

}

1493

} else if(WIFSIGNALED(status)){

1494

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

1495

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

1496

WTERMSIG(status));

1497

free(fullname);

1498

continue;

1499

} else {

1500

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

1501

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

1502

free(fullname);

1503

continue;

1504

}

1505

}

1506

free(fullname);

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

}

1512

close(devnull);

1513

}

1514

return true;

1996

perror_plus("setenv");

1997

_exit(EX_OSERR);

1998

}

1999

free(delaystring);

2000

if(connect_to != NULL){

2001

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

2002

if(ret == -1){

2003

perror_plus("setenv");

2004

_exit(EX_OSERR);

2005

}

2006

}

2007

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

2008

direntry->d_name,

2009

O_RDONLY));

2010

if(hook_fd == -1){

2011

perror_plus("openat");

2012

_exit(EXIT_FAILURE);

2013

}

2014

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

2015

perror_plus("close");

2016

_exit(EXIT_FAILURE);

2017

}

2018

ret = dup2(devnull, STDIN_FILENO);

2019

if(ret == -1){

2020

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

2021

_exit(EX_OSERR);

2022

}

2023

ret = close(devnull);

2024

if(ret == -1){

2025

perror_plus("close");

2026

_exit(EX_OSERR);

2027

}

2028

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2029

if(ret == -1){

2030

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

2031

_exit(EX_OSERR);

2032

}

2033

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

2034

environ) == -1){

2035

perror_plus("fexecve");

2036

_exit(EXIT_FAILURE);

2037

}

2038

} else {

2039

if(hook_pid == -1){

2040

perror_plus("fork");

2041

free(direntry);

2042

continue;

2043

}

2044

int status;

2045

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

2046

perror_plus("waitpid");

2047

free(direntry);

2048

continue;

2049

}

2050

if(WIFEXITED(status)){

2051

if(WEXITSTATUS(status) != 0){

2052

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

2053

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

2054

WEXITSTATUS(status));

2055

free(direntry);

2056

continue;

2057

}

2058

} else if(WIFSIGNALED(status)){

2059

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

2060

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

2061

WTERMSIG(status));

2062

free(direntry);

2063

continue;

2064

} else {

2065

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

2066

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

2067

free(direntry);

2068

continue;

2069

}

2070

}

2071

if(debug){

2072

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

2073

direntry->d_name);

2074

}

2075

free(direntry);

2076

}

2077

free(direntries);

2078

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

2079

perror_plus("close");

2080

} else {

2081

hookdir_fd = -1;

2082

}

2083

close(devnull);

2084

}

2085

2086

__attribute__((nonnull, warn_unused_result))

2087

error_t bring_up_interface(const char *const interface,

2088

const float delay){

2089

error_t old_errno = errno;

2090

int ret;

2091

struct ifreq network;

2092

unsigned int if_index = if_nametoindex(interface);

2093

if(if_index == 0){

2094

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

2095

errno = old_errno;

2096

return ENXIO;

2097

}

2098

2099

if(quit_now){

2100

errno = old_errno;

2101

return EINTR;

2102

}

2103

2104

if(not interface_is_up(interface)){

2105

error_t ret_errno = 0, ioctl_errno = 0;

2106

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

2107

ret_errno = errno;

2108

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

2109

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

2110

errno = old_errno;

2111

return ret_errno;

2112

}

2113

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

2114

2115

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

2116

if(sd == -1){

2117

ret_errno = errno;

2118

perror_plus("socket");

2119

errno = old_errno;

2120

return ret_errno;

2121

}

2122

2123

if(quit_now){

2124

ret = close(sd);

2125

if(ret == -1){

2126

perror_plus("close");

2127

}

2128

errno = old_errno;

2129

return EINTR;

2130

}

2131

2132

if(debug){

2133

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

2134

interface);

2135

}

2136

2137

/* Raise privileges */

2138

ret_errno = raise_privileges();

2139

if(ret_errno != 0){

2140

errno = ret_errno;

2141

perror_plus("Failed to raise privileges");

2142

}

2143

2144

#ifdef __linux__

2145

int ret_linux;

2146

bool restore_loglevel = false;

2147

if(ret_errno == 0){

2148

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2149

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

2150

ret_linux = klogctl(8, NULL, 5);

2151

if(ret_linux == -1){

2152

perror_plus("klogctl");

2153

} else {

2154

restore_loglevel = true;

2155

}

2156

}

2157

#endif /* __linux__ */

2158

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

2159

ioctl_errno = errno;

2160

#ifdef __linux__

2161

if(restore_loglevel){

2162

ret_linux = klogctl(7, NULL, 0);

2163

if(ret_linux == -1){

2164

perror_plus("klogctl");

2165

}

2166

}

2167

#endif /* __linux__ */

2168

2169

/* If raise_privileges() succeeded above */

2170

if(ret_errno == 0){

2171

/* Lower privileges */

2172

ret_errno = lower_privileges();

2173

if(ret_errno != 0){

2174

errno = ret_errno;

2175

perror_plus("Failed to lower privileges");

2176

}

2177

}

2178

2179

/* Close the socket */

2180

ret = close(sd);

2181

if(ret == -1){

2182

perror_plus("close");

2183

}

2184

2185

if(ret_setflags == -1){

2186

errno = ioctl_errno;

2187

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2188

errno = old_errno;

2189

return ioctl_errno;

2190

}

2191

} else if(debug){

2192

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

2193

interface);

2194

}

2195

2196

/* Sleep checking until interface is running.

2197

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

2198

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

2199

if(interface_is_running(interface)){

2200

break;

2201

}

2202

struct timespec sleeptime = { .tv_nsec = 250000000 };

2203

ret = nanosleep(&sleeptime, NULL);

2204

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

2205

perror_plus("nanosleep");

2206

}

2207

}

2208

2209

errno = old_errno;

2210

return 0;

2211

}

2212

2213

__attribute__((nonnull, warn_unused_result))

2214

error_t take_down_interface(const char *const interface){

2215

error_t old_errno = errno;

2216

struct ifreq network;

2217

unsigned int if_index = if_nametoindex(interface);

2218

if(if_index == 0){

2219

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

2220

errno = old_errno;

2221

return ENXIO;

2222

}

2223

if(interface_is_up(interface)){

2224

error_t ret_errno = 0, ioctl_errno = 0;

2225

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

2226

ret_errno = errno;

2227

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

2228

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

2229

errno = old_errno;

2230

return ret_errno;

2231

}

2232

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

2233

2234

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

2235

if(sd == -1){

2236

ret_errno = errno;

2237

perror_plus("socket");

2238

errno = old_errno;

2239

return ret_errno;

2240

}

2241

2242

if(debug){

2243

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

2244

interface);

2245

}

2246

2247

/* Raise privileges */

2248

ret_errno = raise_privileges();

2249

if(ret_errno != 0){

2250

errno = ret_errno;

2251

perror_plus("Failed to raise privileges");

2252

}

2253

2254

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

2255

ioctl_errno = errno;

2256

2257

/* If raise_privileges() succeeded above */

2258

if(ret_errno == 0){

2259

/* Lower privileges */

2260

ret_errno = lower_privileges();

2261

if(ret_errno != 0){

2262

errno = ret_errno;

2263

perror_plus("Failed to lower privileges");

2264

}

2265

}

2266

2267

/* Close the socket */

2268

int ret = close(sd);

2269

if(ret == -1){

2270

perror_plus("close");

2271

}

2272

2273

if(ret_setflags == -1){

2274

errno = ioctl_errno;

2275

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2276

errno = old_errno;

2277

return ioctl_errno;

2278

}

2279

} else if(debug){

2280

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

2281

interface);

2282

}

2283

2284

errno = old_errno;

2285

return 0;

1515

2286

}

1516

2287

1517

2288

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

2289

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

2290

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

2291

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

2292

.interfaces = NULL, .interfaces_size = 0 };

1518

2293

AvahiSServiceBrowser *sb = NULL;

1519

int error;

2294

error_t ret_errno;

1520

2295

int ret;

1521

2296

intmax_t tmpmax;

1522

2297

char *tmp;

1523

2298

int exitcode = EXIT_SUCCESS;

1524

const char *interface = "";

1525

struct ifreq network;

1526

int sd = -1;

1527

bool take_down_interface = false;

1528

uid_t uid;

1529

gid_t gid;

1530

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

1531

bool tempdir_created = false;

2299

char *interfaces_to_take_down = NULL;

2300

size_t interfaces_to_take_down_size = 0;

2301

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

2302

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

2303

char *tempdir = NULL;

1532

2304

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1533

2305

const char *seckey = PATHDIR "/" SECKEY;

1534

2306

const char *pubkey = PATHDIR "/" PUBKEY;

2307

const char *dh_params_file = NULL;

2308

char *interfaces_hooks = NULL;

1535

2309

1536

2310

bool gnutls_initialized = false;

1537

2311

bool gpgme_initialized = false;

1589

2363

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

1590

2364

" Diffie-Hellman key exchange",

1591

2365

.group = 2 },

2366

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

2367

.arg = "FILE",

2368

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

2369

" for the Diffie-Hellman key exchange",

2370

.group = 2 },

1592

2371

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

1593

2372

.arg = "STRING",

1594

2373

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

1599

2378

.group = 2 },

1600

2379

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

1601

2380

.arg = "SECONDS",

1602

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

2381

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

1603

2382

.group = 2 },

1604

2383

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

1605

2384

.arg = "DIR",

1628

2407

connect_to = arg;

1629

2408

break;

1630

2409

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

1631

interface = arg;

2410

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

2411

arg, (int)',');

2412

if(ret_errno != 0){

2413

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

2414

}

1632

2415

break;

1633

2416

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

1634

2417

seckey = arg;

1645

2428

}

1646

2429

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

1647

2430

break;

2431

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

2432

dh_params_file = arg;

2433

break;

1648

2434

case 130: /* --priority */

1649

2435

mc.priority = arg;

1650

2436

break;

1706

2492

goto end;

1707

2493

}

1708

2494

}

1709

2495

1710

2496

{

1711

2497

/* Work around Debian bug #633582:

1712

2498

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

1713

2499

1714

/* Re-raise priviliges */

1715

errno = 0;

1716

ret = seteuid(0);

1717

if(ret == -1){

1718

perror_plus("seteuid");

2500

/* Re-raise privileges */

2501

ret_errno = raise_privileges();

2502

if(ret_errno != 0){

2503

errno = ret_errno;

2504

perror_plus("Failed to raise privileges");

1719

2505

} else {

1720

2506

struct stat st;

1721

2507

1736

2522

}

1737

2523

}

1738

2524

}

1739

TEMP_FAILURE_RETRY(close(seckey_fd));

2525

close(seckey_fd);

1740

2526

}

1741

2527

}

1742

2528

1743

2529

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

1744

2530

int pubkey_fd = open(pubkey, O_RDONLY);

1745

2531

if(pubkey_fd == -1){

1757

2543

}

1758

2544

}

1759

2545

}

1760

TEMP_FAILURE_RETRY(close(pubkey_fd));

1761

}

1762

}

1763

2546

close(pubkey_fd);

2547

}

2548

}

2549

2550

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

2551

int dhparams_fd = open(dh_params_file, O_RDONLY);

2552

if(dhparams_fd == -1){

2553

perror_plus("open");

2554

} else {

2555

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

2556

if(ret == -1){

2557

perror_plus("fstat");

2558

} else {

2559

if(S_ISREG(st.st_mode)

2560

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

2561

ret = fchown(dhparams_fd, uid, gid);

2562

if(ret == -1){

2563

perror_plus("fchown");

2564

}

2565

}

2566

}

2567

close(dhparams_fd);

2568

}

2569

}

2570

1764

2571

/* Lower privileges */

1765

errno = 0;

1766

ret = seteuid(uid);

1767

if(ret == -1){

1768

perror_plus("seteuid");

2572

ret_errno = lower_privileges();

2573

if(ret_errno != 0){

2574

errno = ret_errno;

2575

perror_plus("Failed to lower privileges");

2576

}

2577

}

2578

}

2579

2580

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

2581

{

2582

char *interface = NULL;

2583

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

2584

interface))){

2585

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

2586

and if_nametoindex(interface) == 0){

2587

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

2588

fprintf_plus(stderr, "Not using nonexisting interface"

2589

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

2590

}

2591

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

2592

interface = NULL;

1769

2593

}

1770

2594

}

1771

2595

}

1772

2596

1773

2597

/* Run network hooks */

1774

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

1775

goto end;

2598

{

2599

if(mc.interfaces != NULL){

2600

interfaces_hooks = malloc(mc.interfaces_size);

2601

if(interfaces_hooks == NULL){

2602

perror_plus("malloc");

2603

goto end;

2604

}

2605

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

2606

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

2607

}

2608

run_network_hooks("start", interfaces_hooks != NULL ?

2609

interfaces_hooks : "", delay);

1776

2610

}

1777

2611

1778

2612

if(not debug){

1779

2613

avahi_set_log_function(empty_log);

1780

2614

}

1781

2615

1782

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

1783

struct dirent **direntries;

1784

/* First look for interfaces that are up */

1785

ret = scandir(sys_class_net, &direntries, up_interface,

1786

alphasort);

1787

if(ret == 0){

1788

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

1789

free(direntries);

1790

ret = scandir(sys_class_net, &direntries, good_interface,

1791

alphasort);

1792

}

1793

if(ret >= 1){

1794

/* Pick the first interface returned */

1795

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

1796

if(debug){

1797

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

1798

}

1799

if(interface == NULL){

1800

perror_plus("malloc");

1801

free(direntries);

1802

exitcode = EXIT_FAILURE;

1803

goto end;

1804

}

1805

free(direntries);

1806

} else {

1807

free(direntries);

1808

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

1809

exitcode = EXIT_FAILURE;

1810

goto end;

1811

}

1812

}

1813

1814

2616

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

1815

2617

from the signal handler */

1816

2618

/* Initialize the pseudo-RNG for Avahi */

1817

2619

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

1818

mc.simple_poll = avahi_simple_poll_new();

1819

if(mc.simple_poll == NULL){

2620

simple_poll = avahi_simple_poll_new();

2621

if(simple_poll == NULL){

1820

2622

fprintf_plus(stderr,

1821

2623

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

1822

2624

exitcode = EX_UNAVAILABLE;

1886

2688

}

1887

2689

}

1888

2690

1889

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

1890

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

1891

if_index = (AvahiIfIndex) if_nametoindex(interface);

1892

if(if_index == 0){

1893

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

1894

exitcode = EX_UNAVAILABLE;

1895

goto end;

1896

}

1897

1898

if(quit_now){

1899

goto end;

1900

}

1901

1902

/* Re-raise priviliges */

1903

errno = 0;

1904

ret = seteuid(0);

1905

if(ret == -1){

1906

perror_plus("seteuid");

1907

}

1908

1909

#ifdef __linux__

1910

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1911

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

1912

ret = klogctl(8, NULL, 5);

1913

bool restore_loglevel = true;

1914

if(ret == -1){

1915

restore_loglevel = false;

1916

perror_plus("klogctl");

1917

}

1918

#endif /* __linux__ */

1919

1920

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1921

if(sd < 0){

1922

perror_plus("socket");

1923

exitcode = EX_OSERR;

1924

#ifdef __linux__

1925

if(restore_loglevel){

1926

ret = klogctl(7, NULL, 0);

1927

if(ret == -1){

1928

perror_plus("klogctl");

1929

}

1930

}

1931

#endif /* __linux__ */

1932

/* Lower privileges */

1933

errno = 0;

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

1938

goto end;

1939

}

1940

strcpy(network.ifr_name, interface);

1941

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

1942

if(ret == -1){

1943

perror_plus("ioctl SIOCGIFFLAGS");

1944

#ifdef __linux__

1945

if(restore_loglevel){

1946

ret = klogctl(7, NULL, 0);

1947

if(ret == -1){

1948

perror_plus("klogctl");

1949

}

1950

}

1951

#endif /* __linux__ */

1952

exitcode = EX_OSERR;

1953

/* Lower privileges */

1954

errno = 0;

1955

ret = seteuid(uid);

1956

if(ret == -1){

1957

perror_plus("seteuid");

1958

}

1959

goto end;

1960

}

1961

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

1962

network.ifr_flags |= IFF_UP;

1963

take_down_interface = true;

1964

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

1965

if(ret == -1){

1966

take_down_interface = false;

1967

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1968

exitcode = EX_OSERR;

1969

#ifdef __linux__

1970

if(restore_loglevel){

1971

ret = klogctl(7, NULL, 0);

1972

if(ret == -1){

1973

perror_plus("klogctl");

2691

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

2692

if(mc.interfaces == NULL){

2693

struct dirent **direntries = NULL;

2694

/* Look for any good interfaces */

2695

ret = scandir(sys_class_net, &direntries, good_interface,

2696

alphasort);

2697

if(ret >= 1){

2698

/* Add all found interfaces to interfaces list */

2699

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

2700

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

2701

direntries[i]->d_name);

2702

if(ret_errno != 0){

2703

errno = ret_errno;

2704

perror_plus("argz_add");

2705

free(direntries[i]);

2706

continue;

2707

}

2708

if(debug){

2709

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

2710

direntries[i]->d_name);

2711

}

2712

free(direntries[i]);

2713

}

2714

free(direntries);

2715

} else {

2716

if(ret == 0){

2717

free(direntries);

2718

}

2719

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

2720

exitcode = EXIT_FAILURE;

2721

goto end;

2722

}

2723

}

2724

2725

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

2726

{

2727

char *interface = NULL;

2728

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

2729

interface))){

2730

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

2731

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

2732

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

2733

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

2734

interface);

2735

interface = NULL;

2736

while((interface = argz_next(mc.interfaces,

2737

mc.interfaces_size, interface))){

2738

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

2739

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

2740

interface);

2741

interface = NULL;

1974

2742

}

1975

2743

}

1976

#endif /* __linux__ */

1977

/* Lower privileges */

1978

errno = 0;

1979

ret = seteuid(uid);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

goto end;

1984

}

1985

}

1986

/* Sleep checking until interface is running.

1987

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

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCGIFFLAGS");

1992

} else if(network.ifr_flags & IFF_RUNNING){

1993

2744

break;

1994

2745

}

1995

struct timespec sleeptime = { .tv_nsec = 250000000 };

1996

ret = nanosleep(&sleeptime, NULL);

1997

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

1998

perror_plus("nanosleep");

1999

}

2000

}

2001

if(not take_down_interface){

2002

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

2003

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

2004

if(ret == -1){

2005

perror_plus("close");

2006

}

2007

}

2008

#ifdef __linux__

2009

if(restore_loglevel){

2010

/* Restores kernel loglevel to default */

2011

ret = klogctl(7, NULL, 0);

2012

if(ret == -1){

2013

perror_plus("klogctl");

2014

}

2015

}

2016

#endif /* __linux__ */

2017

/* Lower privileges */

2018

errno = 0;

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

2023

}

2746

bool interface_was_up = interface_is_up(interface);

2747

errno = bring_up_interface(interface, delay);

2748

if(not interface_was_up){

2749

if(errno != 0){

2750

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

2751

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

2752

} else {

2753

errno = argz_add(&interfaces_to_take_down,

2754

&interfaces_to_take_down_size,

2755

interface);

2756

if(errno != 0){

2757

perror_plus("argz_add");

2758

}

2759

}

2760

}

2761

}

2762

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

2763

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

2764

}

2765

}

2766

2767

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

2768

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

2769

if(debug){

2770

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

2771

mc.interfaces);

2772

}

2773

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

2024

2774

}

2025

2775

2026

2776

if(quit_now){

2027

2777

goto end;

2028

2778

}

2029

2779

2030

ret = init_gnutls_global(pubkey, seckey);

2780

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

2031

2781

if(ret == -1){

2032

2782

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

2033

2783

exitcode = EX_UNAVAILABLE;

2040

2790

goto end;

2041

2791

}

2042

2792

2043

if(mkdtemp(tempdir) == NULL){

2793

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

2794

tempdir = mkdtemp(run_tempdir);

2795

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

2796

if(debug){

2797

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

2798

run_tempdir, old_tempdir);

2799

}

2800

tempdir = mkdtemp(old_tempdir);

2801

}

2802

if(tempdir == NULL){

2044

2803

perror_plus("mkdtemp");

2045

2804

goto end;

2046

2805

}

2047

tempdir_created = true;

2048

2806

2049

2807

if(quit_now){

2050

2808

goto end;

2051

2809

}

2052

2810

2053

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

2811

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

2054

2812

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

2055

2813

exitcode = EX_UNAVAILABLE;

2056

2814

goto end;

2066

2824

/* Connect directly, do not use Zeroconf */

2067

2825

/* (Mainly meant for debugging) */

2068

2826

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

2827

2069

2828

if(address == NULL){

2070

2829

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

2071

2830

exitcode = EX_USAGE;

2076

2835

goto end;

2077

2836

}

2078

2837

2079

uint16_t port;

2838

in_port_t port;

2080

2839

errno = 0;

2081

2840

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

2082

2841

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

2083

or tmpmax != (uint16_t)tmpmax){

2842

or tmpmax != (in_port_t)tmpmax){

2084

2843

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

2085

2844

exitcode = EX_USAGE;

2086

2845

goto end;

2087

2846

}

2088

2847

2089

2848

if(quit_now){

2090

2849

goto end;

2091

2850

}

2092

2851

2093

port = (uint16_t)tmpmax;

2852

port = (in_port_t)tmpmax;

2094

2853

*address = '\0';

2095

2854

/* Colon in address indicates IPv6 */

2096

2855

int af;

2112

2871

}

2113

2872

2114

2873

while(not quit_now){

2115

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

2874

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

2875

&mc);

2116

2876

if(quit_now or ret == 0){

2117

2877

break;

2118

2878

}

2120

2880

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

2121

2881

(int)retry_interval);

2122

2882

}

2123

sleep((int)retry_interval);

2883

sleep((unsigned int)retry_interval);

2124

2884

}

2125

2885

2126

if (not quit_now){

2886

if(not quit_now){

2127

2887

exitcode = EXIT_SUCCESS;

2128

2888

}

2129

2889

2144

2904

config.publish_domain = 0;

2145

2905

2146

2906

/* Allocate a new server */

2147

mc.server = avahi_server_new(avahi_simple_poll_get

2148

(mc.simple_poll), &config, NULL,

2149

NULL, &error);

2907

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2908

&config, NULL, NULL, &ret_errno);

2150

2909

2151

2910

/* Free the Avahi configuration data */

2152

2911

avahi_server_config_free(&config);

2155

2914

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

2156

2915

if(mc.server == NULL){

2157

2916

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

2158

avahi_strerror(error));

2917

avahi_strerror(ret_errno));

2159

2918

exitcode = EX_UNAVAILABLE;

2160

2919

goto end;

2161

2920

}

2167

2926

/* Create the Avahi service browser */

2168

2927

sb = avahi_s_service_browser_new(mc.server, if_index,

2169

2928

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2170

NULL, 0, browse_callback, NULL);

2929

NULL, 0, browse_callback,

2930

(void *)&mc);

2171

2931

if(sb == NULL){

2172

2932

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

2173

2933

avahi_strerror(avahi_server_errno(mc.server)));

2184

2944

if(debug){

2185

2945

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

2186

2946

}

2187

2188

ret = avahi_loop_with_timeout(mc.simple_poll,

2189

(int)(retry_interval * 1000));

2947

2948

ret = avahi_loop_with_timeout(simple_poll,

2949

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

2190

2950

if(debug){

2191

2951

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

2192

2952

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

2199

2959

}

2200

2960

2201

2961

/* Cleanup things */

2962

free(mc.interfaces);

2963

2202

2964

if(sb != NULL)

2203

2965

avahi_s_service_browser_free(sb);

2204

2966

2205

2967

if(mc.server != NULL)

2206

2968

avahi_server_free(mc.server);

2207

2969

2208

if(mc.simple_poll != NULL)

2209

avahi_simple_poll_free(mc.simple_poll);

2970

if(simple_poll != NULL)

2971

avahi_simple_poll_free(simple_poll);

2210

2972

2211

2973

if(gnutls_initialized){

2212

2974

gnutls_certificate_free_credentials(mc.cred);

2224

2986

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

2225

2987

while(mc.current_server != NULL){

2226

2988

server *next = mc.current_server->next;

2989

#ifdef __GNUC__

2990

#pragma GCC diagnostic push

2991

#pragma GCC diagnostic ignored "-Wcast-qual"

2992

#endif

2993

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

2994

#ifdef __GNUC__

2995

#pragma GCC diagnostic pop

2996

#endif

2227

2997

free(mc.current_server);

2228

2998

mc.current_server = next;

2229

2999

}

2230

3000

}

2231

3001

2232

/* Run network hooks */

2233

run_network_hooks("stop", interface, delay);

2234

2235

/* Re-raise priviliges */

3002

/* Re-raise privileges */

2236

3003

{

2237

errno = 0;

2238

ret = seteuid(0);

2239

if(ret == -1){

2240

perror_plus("seteuid");

3004

ret_errno = raise_privileges();

3005

if(ret_errno != 0){

3006

errno = ret_errno;

3007

perror_plus("Failed to raise privileges");

3008

} else {

3009

3010

/* Run network hooks */

3011

run_network_hooks("stop", interfaces_hooks != NULL ?

3012

interfaces_hooks : "", delay);

3013

3014

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

3015

{

3016

char *interface = NULL;

3017

while((interface=argz_next(interfaces_to_take_down,

3018

interfaces_to_take_down_size,

3019

interface))){

3020

ret_errno = take_down_interface(interface);

3021

if(ret_errno != 0){

3022

errno = ret_errno;

3023

perror_plus("Failed to take down interface");

3024

}

3025

}

3026

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

3027

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

3028

" down\n");

3029

}

3030

}

2241

3031

}

2242

3032

2243

/* Take down the network interface */

2244

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

2245

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

2246

if(ret == -1){

2247

perror_plus("ioctl SIOCGIFFLAGS");

2248

} else if(network.ifr_flags & IFF_UP){

2249

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

2250

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

2251

if(ret == -1){

2252

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2253

}

2254

}

2255

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

2256

if(ret == -1){

2257

perror_plus("close");

2258

}

3033

ret_errno = lower_privileges_permanently();

3034

if(ret_errno != 0){

3035

errno = ret_errno;

3036

perror_plus("Failed to lower privileges permanently");

2259

3037

}

2260

3038

}

2261

/* Lower privileges permanently */

2262

errno = 0;

2263

ret = setuid(uid);

2264

if(ret == -1){

2265

perror_plus("setuid");

2266

}

3039

3040

free(interfaces_to_take_down);

3041

free(interfaces_hooks);

2267

3042

2268

3043

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

2269

if(tempdir_created){

3044

if(tempdir != NULL){

2270

3045

struct dirent **direntries = NULL;

2271

struct dirent *direntry = NULL;

2272

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

2273

alphasort);

2274

if (numentries > 0){

2275

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

2276

direntry = direntries[i];

2277

char *fullname = NULL;

2278

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

2279

direntry->d_name);

2280

if(ret < 0){

2281

perror_plus("asprintf");

2282

continue;

2283

}

2284

ret = remove(fullname);

2285

if(ret == -1){

2286

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

2287

strerror(errno));

2288

}

2289

free(fullname);

3046

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

3047

| O_NOFOLLOW

3048

| O_DIRECTORY

3049

| O_PATH));

3050

if(tempdir_fd == -1){

3051

perror_plus("open");

3052

} else {

3053

#ifdef __GLIBC__

3054

#if __GLIBC_PREREQ(2, 15)

3055

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

3056

notdotentries, alphasort);

3057

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

3058

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

3059

alphasort);

3060

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

3061

#else /* not __GLIBC__ */

3062

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

3063

alphasort);

3064

#endif /* not __GLIBC__ */

3065

if(numentries >= 0){

3066

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

3067

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

3068

if(ret == -1){

3069

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

3070

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

3071

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

3072

}

3073

free(direntries[i]);

3074

}

3075

3076

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

3077

free(direntries);

3078

if(numentries == -1){

3079

perror_plus("scandir");

3080

}

3081

ret = rmdir(tempdir);

3082

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

3083

perror_plus("rmdir");

3084

}

2290

3085

}

2291

}

2292

2293

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

2294

free(direntries);

2295

if (numentries == -1){

2296

perror_plus("scandir");

2297

}

2298

ret = rmdir(tempdir);

2299

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

2300

perror_plus("rmdir");

3086

close(tempdir_fd);

2301

3087

}

2302

3088

}

2303

3089