/mandos/trunk : revision 237.4.22

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 /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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() */

44

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

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stdout, ferror(), remove() */

44

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

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

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

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strtof(), abort() */

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

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

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asprintf(), strcpy() */

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

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

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#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,

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opendir(), DIR */

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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inet_pton(), connect() */

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

61

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

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61

*/

63

62

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

64

63

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(),

76

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

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unlinkat() */

78

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

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

77

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

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

80

79

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

81

80

argp_state, struct argp,

89

88

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

90

89

WEXITSTATUS(), WTERMSIG() */

91

90

#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,

97

EAI_SYSTEM, gai_strerror() */

98

91

99

92

#ifdef __linux__

100

93

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

142

135

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

143

136

char *connect_to = NULL;

144

137

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

147

gid_t gid = 65534;

148

138

149

139

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

150

140

typedef struct server{

151

141

const char *ip;

152

in_port_t port;

142

uint16_t port;

153

143

AvahiIfIndex if_index;

154

144

int af;

155

145

struct timespec last_seen;

159

149

160

150

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

161

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

162

153

AvahiServer *server;

163

154

gnutls_certificate_credentials_t cred;

164

155

unsigned int dh_bits;

166

157

const char *priority;

167

158

gpgme_ctx_t ctx;

168

159

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

160

} mandos_context;

172

161

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

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 };

175

167

176

168

sig_atomic_t quit_now = 0;

177

169

int signal_received = 0;

185

177

perror(print_text);

186

178

}

187

179

188

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

180

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

189

181

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

190

182

va_list ap;

191

183

va_start (ap, format);

192

184

193

185

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

194

186

program_invocation_short_name));

195

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

187

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

196

188

}

197

189

198

190

/*

200

192

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

201

193

* "buffer_length" is how much is already used.

202

194

*/

203

__attribute__((nonnull, warn_unused_result))

204

195

size_t incbuffer(char **buffer, size_t buffer_length,

205

196

size_t buffer_capacity){

206

197

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

198

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

199

if(buffer == NULL){

213

200

return 0;

214

201

}

215

*buffer = new_buf;

216

202

buffer_capacity += BUFFER_SIZE;

217

203

}

218

204

return buffer_capacity;

219

205

}

220

206

221

207

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

208

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

209

int af){

225

210

int ret;

226

211

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

227

212

if(new_server == NULL){

234

219

.af = af };

235

220

if(new_server->ip == NULL){

236

221

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

222

return false;

253

223

}

254

224

/* Special case of first server */

255

if(*current_server == NULL){

225

if (mc.current_server == NULL){

256

226

new_server->next = new_server;

257

227

new_server->prev = new_server;

258

*current_server = new_server;

228

mc.current_server = new_server;

229

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

259

230

} else {

260

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

261

new_server->next = *current_server;

262

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

231

new_server->next = mc.current_server;

232

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

263

233

new_server->prev->next = new_server;

264

(*current_server)->prev = new_server;

234

mc.current_server->prev = new_server;

235

}

236

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

237

if(ret == -1){

238

perror_plus("clock_gettime");

239

return false;

265

240

}

266

241

return true;

267

242

}

269

244

/*

270

245

* Initialize GPGME.

271

246

*/

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

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

248

const char *tempdir){

277

249

gpgme_error_t rc;

278

250

gpgme_engine_info_t engine_info;

279

251

252

280

253

/*

281

254

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

282

255

*/

283

bool import_key(const char * const filename){

256

bool import_key(const char *filename){

284

257

int ret;

285

258

int fd;

286

259

gpgme_data_t pgp_data;

298

271

return false;

299

272

}

300

273

301

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

274

rc = gpgme_op_import(mc.ctx, pgp_data);

302

275

if(rc != GPG_ERR_NO_ERROR){

303

276

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

304

277

gpgme_strsource(rc), gpgme_strerror(rc));

348

321

}

349

322

350

323

/* Create new GPGME "context" */

351

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

324

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

352

325

if(rc != GPG_ERR_NO_ERROR){

353

326

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

354

327

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

367

340

* Decrypt OpenPGP data.

368

341

* Returns -1 on error

369

342

*/

370

__attribute__((nonnull, warn_unused_result))

371

343

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

344

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

345

char **plaintext){

375

346

gpgme_data_t dh_crypto, dh_plain;

376

347

gpgme_error_t rc;

377

348

ssize_t ret;

403

374

404

375

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

405

376

data buffer */

406

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

377

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

407

378

if(rc != GPG_ERR_NO_ERROR){

408

379

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

409

380

gpgme_strsource(rc), gpgme_strerror(rc));

410

381

plaintext_length = -1;

411

382

if(debug){

412

383

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

384

result = gpgme_op_decrypt_result(mc.ctx);

414

385

if(result == NULL){

415

386

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

416

387

} else {

493

464

return plaintext_length;

494

465

}

495

466

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);

467

static const char * safer_gnutls_strerror(int value){

468

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

469

-Wunreachable-code */

470

if(ret == NULL)

471

ret = "(unknown)";

472

return ret;

507

473

}

508

474

509

475

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

476

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

512

477

const char* string){

513

478

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

514

479

}

515

480

516

__attribute__((nonnull, warn_unused_result))

517

481

static int init_gnutls_global(const char *pubkeyfilename,

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

520

mandos_context *mc){

482

const char *seckeyfilename){

521

483

int ret;

522

unsigned int uret;

523

484

524

485

if(debug){

525

486

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

541

502

}

542

503

543

504

/* OpenPGP credentials */

544

ret = gnutls_certificate_allocate_credentials(&mc->cred);

505

ret = gnutls_certificate_allocate_credentials(&mc.cred);

545

506

if(ret != GNUTLS_E_SUCCESS){

546

507

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

547

508

safer_gnutls_strerror(ret));

557

518

}

558

519

559

520

ret = gnutls_certificate_set_openpgp_key_file

560

(mc->cred, pubkeyfilename, seckeyfilename,

521

(mc.cred, pubkeyfilename, seckeyfilename,

561

522

GNUTLS_OPENPGP_FMT_BASE64);

562

523

if(ret != GNUTLS_E_SUCCESS){

563

524

fprintf_plus(stderr,

569

530

}

570

531

571

532

/* GnuTLS server initialization */

572

ret = gnutls_dh_params_init(&mc->dh_params);

533

ret = gnutls_dh_params_init(&mc.dh_params);

573

534

if(ret != GNUTLS_E_SUCCESS){

574

535

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

575

536

" initialization: %s\n",

576

537

safer_gnutls_strerror(ret));

577

538

goto globalfail;

578

539

}

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);

540

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

541

if(ret != GNUTLS_E_SUCCESS){

542

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

543

safer_gnutls_strerror(ret));

544

goto globalfail;

545

}

546

547

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

752

548

753

549

return 0;

754

550

755

551

globalfail:

756

552

757

gnutls_certificate_free_credentials(mc->cred);

553

gnutls_certificate_free_credentials(mc.cred);

758

554

gnutls_global_deinit();

759

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_dh_params_deinit(mc.dh_params);

760

556

return -1;

761

557

}

762

558

763

__attribute__((nonnull, warn_unused_result))

764

static int init_gnutls_session(gnutls_session_t *session,

765

mandos_context *mc){

559

static int init_gnutls_session(gnutls_session_t *session){

766

560

int ret;

767

561

/* GnuTLS session creation */

768

562

do {

780

574

{

781

575

const char *err;

782

576

do {

783

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

577

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

784

578

if(quit_now){

785

579

gnutls_deinit(*session);

786

580

return -1;

797

591

798

592

do {

799

593

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

800

mc->cred);

594

mc.cred);

801

595

if(quit_now){

802

596

gnutls_deinit(*session);

803

597

return -1;

813

607

/* ignore client certificate if any. */

814

608

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

815

609

610

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

611

816

612

return 0;

817

613

}

818

614

820

616

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

821

617

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

822

618

823

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

824

__attribute__((warn_unused_result))

825

error_t raise_privileges(void){

826

error_t old_errno = errno;

827

error_t ret_errno = 0;

828

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

829

ret_errno = errno;

830

}

831

errno = old_errno;

832

return ret_errno;

833

}

834

835

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

836

__attribute__((warn_unused_result))

837

error_t raise_privileges_permanently(void){

838

error_t old_errno = errno;

839

error_t ret_errno = raise_privileges();

840

if(ret_errno != 0){

841

errno = old_errno;

842

return ret_errno;

843

}

844

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

845

ret_errno = errno;

846

}

847

errno = old_errno;

848

return ret_errno;

849

}

850

851

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

852

__attribute__((warn_unused_result))

853

error_t lower_privileges(void){

854

error_t old_errno = errno;

855

error_t ret_errno = 0;

856

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

857

ret_errno = errno;

858

}

859

errno = old_errno;

860

return ret_errno;

861

}

862

863

/* Lower privileges permanently */

864

__attribute__((warn_unused_result))

865

error_t lower_privileges_permanently(void){

866

error_t old_errno = errno;

867

error_t ret_errno = 0;

868

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

869

ret_errno = errno;

870

}

871

errno = old_errno;

872

return ret_errno;

873

}

874

875

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

876

__attribute__((nonnull, warn_unused_result))

877

static bool add_delete_local_route(const bool add,

878

const char *address,

879

AvahiIfIndex if_index){

880

int ret;

881

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

882

char add_arg[] = "add";

883

char delete_arg[] = "delete";

884

char debug_flag[] = "--debug";

885

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

886

if(pluginhelperdir == NULL){

887

if(debug){

888

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

889

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

890

}

891

return false;

892

}

893

894

char interface[IF_NAMESIZE];

895

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

896

perror_plus("if_indextoname");

897

return false;

898

}

899

900

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

901

if(devnull == -1){

902

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

903

return false;

904

}

905

pid_t pid = fork();

906

if(pid == 0){

907

/* Child */

908

/* Raise privileges */

909

errno = raise_privileges_permanently();

910

if(errno != 0){

911

perror_plus("Failed to raise privileges");

912

/* _exit(EX_NOPERM); */

913

} else {

914

/* Set group */

915

errno = 0;

916

ret = setgid(0);

917

if(ret == -1){

918

perror_plus("setgid");

919

_exit(EX_NOPERM);

920

}

921

/* Reset supplementary groups */

922

errno = 0;

923

ret = setgroups(0, NULL);

924

if(ret == -1){

925

perror_plus("setgroups");

926

_exit(EX_NOPERM);

927

}

928

}

929

ret = dup2(devnull, STDIN_FILENO);

930

if(ret == -1){

931

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

932

_exit(EX_OSERR);

933

}

934

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

935

if(ret == -1){

936

perror_plus("close");

937

_exit(EX_OSERR);

938

}

939

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

940

if(ret == -1){

941

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

942

_exit(EX_OSERR);

943

}

944

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

945

O_RDONLY

946

| O_DIRECTORY

947

| O_PATH

948

| O_CLOEXEC));

949

if(helperdir_fd == -1){

950

perror_plus("open");

951

_exit(EX_UNAVAILABLE);

952

}

953

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

954

helper, O_RDONLY));

955

if(helper_fd == -1){

956

perror_plus("openat");

957

_exit(EX_UNAVAILABLE);

958

}

959

TEMP_FAILURE_RETRY(close(helperdir_fd));

960

#ifdef __GNUC__

961

#pragma GCC diagnostic push

962

#pragma GCC diagnostic ignored "-Wcast-qual"

963

#endif

964

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

965

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

966

interface, debug ? debug_flag : NULL, NULL },

967

environ) == -1){

968

#ifdef __GNUC__

969

#pragma GCC diagnostic pop

970

#endif

971

perror_plus("fexecve");

972

_exit(EXIT_FAILURE);

973

}

974

}

975

if(pid == -1){

976

perror_plus("fork");

977

return false;

978

}

979

int status;

980

pid_t pret = -1;

981

errno = 0;

982

do {

983

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

984

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

985

int errno_raising = 0;

986

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

987

errno_raising = errno;

988

perror_plus("Failed to raise privileges in order to"

989

" kill helper program");

990

}

991

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

992

perror_plus("kill");

993

}

994

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

995

perror_plus("Failed to lower privileges after killing"

996

" helper program");

997

}

998

return false;

999

}

1000

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

1001

if(pret == -1){

1002

perror_plus("waitpid");

1003

return false;

1004

}

1005

if(WIFEXITED(status)){

1006

if(WEXITSTATUS(status) != 0){

1007

fprintf_plus(stderr, "Error: iprouteadddel exited"

1008

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

1009

return false;

1010

}

1011

return true;

1012

}

1013

if(WIFSIGNALED(status)){

1014

fprintf_plus(stderr, "Error: iprouteadddel died by"

1015

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

1016

return false;

1017

}

1018

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

1019

return false;

1020

}

1021

1022

__attribute__((nonnull, warn_unused_result))

1023

static bool add_local_route(const char *address,

1024

AvahiIfIndex if_index){

1025

if(debug){

1026

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

1027

}

1028

return add_delete_local_route(true, address, if_index);

1029

}

1030

1031

__attribute__((nonnull, warn_unused_result))

1032

static bool delete_local_route(const char *address,

1033

AvahiIfIndex if_index){

1034

if(debug){

1035

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

1036

}

1037

return add_delete_local_route(false, address, if_index);

1038

}

1039

1040

619

/* Called when a Mandos server is found */

1041

__attribute__((nonnull, warn_unused_result))

1042

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

620

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

1043

621

AvahiIfIndex if_index,

1044

int af, mandos_context *mc){

622

int af){

1045

623

int ret, tcp_sd = -1;

1046

624

ssize_t sret;

1047

struct sockaddr_storage to;

625

union {

626

struct sockaddr_in in;

627

struct sockaddr_in6 in6;

628

} to;

1048

629

char *buffer = NULL;

1049

630

char *decrypted_buffer = NULL;

1050

631

size_t buffer_length = 0;

1053

634

int retval = -1;

1054

635

gnutls_session_t session;

1055

636

int pf; /* Protocol family */

1056

bool route_added = false;

1057

637

1058

638

errno = 0;

1059

639

1075

655

return -1;

1076

656

}

1077

657

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);

658

ret = init_gnutls_session(&session);

1111

659

if(ret != 0){

1112

660

return -1;

1113

661

}

1114

662

1115

663

if(debug){

1116

664

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

1117

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

665

PRIu16 "\n", ip, port);

1118

666

}

1119

667

1120

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

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

1121

669

if(tcp_sd < 0){

1122

670

int e = errno;

1123

671

perror_plus("socket");

1130

678

goto mandos_end;

1131

679

}

1132

680

681

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

1133

682

if(af == AF_INET6){

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

to.in6.sin6_family = (sa_family_t)af;

684

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

1137

685

} else { /* IPv4 */

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

to.in.sin_family = (sa_family_t)af;

687

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

1141

688

}

1142

689

if(ret < 0 ){

1143

690

int e = errno;

1152

699

goto mandos_end;

1153

700

}

1154

701

if(af == AF_INET6){

1155

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

1156

if(IN6_IS_ADDR_LINKLOCAL

1157

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

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

707

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

708

-Wunreachable-code*/

1158

709

if(if_index == AVAHI_IF_UNSPEC){

1159

710

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

1160

711

" incomplete without a network interface\n");

1162

713

goto mandos_end;

1163

714

}

1164

715

/* Set the network interface number as scope */

1165

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

716

to.in6.sin6_scope_id = (uint32_t)if_index;

1166

717

}

1167

718

} else {

1168

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

719

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

720

-Wconversion and

721

-Wunreachable-code */

1169

722

}

1170

723

1171

724

if(quit_now){

1179

732

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

1180

733

perror_plus("if_indextoname");

1181

734

} else {

1182

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

1183

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

735

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

736

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

1184

737

}

1185

738

} else {

1186

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

1187

ip, (uintmax_t)port);

739

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

740

ip, port);

1188

741

}

1189

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1190

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

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;

744

const char *pcret;

745

if(af == AF_INET6){

746

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

747

sizeof(addrstr));

748

} else {

749

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

750

sizeof(addrstr));

751

}

752

if(pcret == NULL){

753

perror_plus("inet_ntop");

754

} else {

755

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

756

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

757

}

758

}

759

}

760

761

if(quit_now){

762

errno = EINTR;

763

goto mandos_end;

764

}

765

766

if(af == AF_INET6){

767

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

768

} else {

769

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

770

}

771

if(ret < 0){

772

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

773

int e = errno;

774

perror_plus("connect");

775

errno = e;

776

}

777

goto mandos_end;

778

}

779

780

if(quit_now){

781

errno = EINTR;

782

goto mandos_end;

1271

783

}

1272

784

1273

785

const char *out = mandos_protocol_version;

1309

821

goto mandos_end;

1310

822

}

1311

823

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

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

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

1317

826

1318

827

if(quit_now){

1319

828

errno = EINTR;

1424

933

if(buffer_length > 0){

1425

934

ssize_t decrypted_buffer_size;

1426

935

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1427

&decrypted_buffer, mc);

936

&decrypted_buffer);

1428

937

if(decrypted_buffer_size >= 0){

1429

938

1430

939

written = 0;

1456

965

1457

966

mandos_end:

1458

967

{

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

}

1465

968

int e = errno;

1466

969

free(decrypted_buffer);

1467

970

free(buffer);

1484

987

return retval;

1485

988

}

1486

989

1487

__attribute__((nonnull))

1488

990

static void resolve_callback(AvahiSServiceResolver *r,

1489

991

AvahiIfIndex interface,

1490

992

AvahiProtocol proto,

1498

1000

AVAHI_GCC_UNUSED AvahiStringList *txt,

1499

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1500

1002

flags,

1501

void *mc){

1502

if(r == NULL){

1503

return;

1504

}

1003

AVAHI_GCC_UNUSED void* userdata){

1004

assert(r);

1505

1005

1506

1006

/* Called whenever a service has been resolved successfully or

1507

1007

timed out */

1508

1008

1509

1009

if(quit_now){

1510

avahi_s_service_resolver_free(r);

1511

1010

return;

1512

1011

}

1513

1012

1517

1016

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

1518

1017

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

1519

1018

domain,

1520

avahi_strerror(avahi_server_errno

1521

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

1019

avahi_strerror(avahi_server_errno(mc.server)));

1522

1020

break;

1523

1021

1524

1022

case AVAHI_RESOLVER_FOUND:

1530

1028

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

1531

1029

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

1532

1030

}

1533

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

1534

interface,

1535

avahi_proto_to_af(proto),

1536

mc);

1031

int ret = start_mandos_communication(ip, port, interface,

1032

avahi_proto_to_af(proto));

1537

1033

if(ret == 0){

1538

avahi_simple_poll_quit(simple_poll);

1034

avahi_simple_poll_quit(mc.simple_poll);

1539

1035

} else {

1540

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

1541

avahi_proto_to_af(proto),

1542

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

1036

if(not add_server(ip, port, interface,

1037

avahi_proto_to_af(proto))){

1543

1038

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

1544

1039

" list\n", name);

1545

1040

}

1558

1053

const char *domain,

1559

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1560

1055

flags,

1561

void *mc){

1562

if(b == NULL){

1563

return;

1564

}

1056

AVAHI_GCC_UNUSED void* userdata){

1057

assert(b);

1565

1058

1566

1059

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

1567

1060

is removed from the LAN */

1575

1068

case AVAHI_BROWSER_FAILURE:

1576

1069

1577

1070

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

1578

avahi_strerror(avahi_server_errno

1579

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

1580

avahi_simple_poll_quit(simple_poll);

1071

avahi_strerror(avahi_server_errno(mc.server)));

1072

avahi_simple_poll_quit(mc.simple_poll);

1581

1073

return;

1582

1074

1583

1075

case AVAHI_BROWSER_NEW:

1586

1078

the callback function is called the Avahi server will free the

1587

1079

resolver for us. */

1588

1080

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)

1081

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

1082

name, type, domain, protocol, 0,

1083

resolve_callback, NULL) == NULL)

1593

1084

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

1594

1085

" %s\n", name,

1595

avahi_strerror(avahi_server_errno

1596

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

1086

avahi_strerror(avahi_server_errno(mc.server)));

1597

1087

break;

1598

1088

1599

1089

case AVAHI_BROWSER_REMOVE:

1618

1108

signal_received = sig;

1619

1109

int old_errno = errno;

1620

1110

/* set main loop to exit */

1621

if(simple_poll != NULL){

1622

avahi_simple_poll_quit(simple_poll);

1111

if(mc.simple_poll != NULL){

1112

avahi_simple_poll_quit(mc.simple_poll);

1623

1113

}

1624

1114

errno = old_errno;

1625

1115

}

1626

1116

1627

__attribute__((nonnull, warn_unused_result))

1628

1117

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

1629

1118

int ret;

1630

error_t ret_errno;

1631

1119

1632

1120

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

1633

1121

if(s < 0){

1634

ret_errno = errno;

1635

1122

perror_plus("socket");

1636

errno = ret_errno;

1637

1123

return false;

1638

1124

}

1639

1125

strcpy(ifr->ifr_name, ifname);

1640

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1641

1127

if(ret == -1){

1642

1128

if(debug){

1643

ret_errno = errno;

1644

1129

perror_plus("ioctl SIOCGIFFLAGS");

1645

errno = ret_errno;

1646

1130

}

1647

1131

return false;

1648

1132

}

1649

1133

return true;

1650

1134

}

1651

1135

1652

__attribute__((nonnull, warn_unused_result))

1653

1136

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

1654

1137

1655

1138

/* Reject the loopback device */

1697

1180

* corresponds to an acceptable network device.

1698

1181

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

1699

1182

*/

1700

__attribute__((nonnull, warn_unused_result))

1701

1183

int good_interface(const struct dirent *if_entry){

1702

1184

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

1703

1185

return 0;

1719

1201

}

1720

1202

1721

1203

/*

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))

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1244

}

1245

1756

1246

int notdotentries(const struct dirent *direntry){

1757

1247

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

1758

1248

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

1765

1255

}

1766

1256

1767

1257

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

1768

__attribute__((nonnull, warn_unused_result))

1769

1258

int runnable_hook(const struct dirent *direntry){

1770

1259

int ret;

1771

1260

size_t sret;

1779

1268

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

1780

1269

"abcdefghijklmnopqrstuvwxyz"

1781

1270

"0123456789"

1782

"_.-");

1271

"_-");

1783

1272

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

1784

1273

/* Contains non-allowed characters */

1785

1274

if(debug){

1789

1278

return 0;

1790

1279

}

1791

1280

1792

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

1281

char *fullname = NULL;

1282

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

1283

if(ret < 0){

1284

perror_plus("asprintf");

1285

return 0;

1286

}

1287

1288

ret = stat(fullname, &st);

1793

1289

if(ret == -1){

1794

1290

if(debug){

1795

1291

perror_plus("Could not stat hook");

1819

1315

return 1;

1820

1316

}

1821

1317

1822

__attribute__((nonnull, warn_unused_result))

1823

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1824

mandos_context *mc){

1318

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1825

1319

int ret;

1826

1320

struct timespec now;

1827

1321

struct timespec waited_time;

1828

1322

intmax_t block_time;

1829

1323

1830

1324

while(true){

1831

if(mc->current_server == NULL){

1832

if(debug){

1325

if(mc.current_server == NULL){

1326

if (debug){

1833

1327

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

1834

1328

" No timeout!\n");

1835

1329

}

1836

1330

ret = avahi_simple_poll_iterate(s, -1);

1837

1331

} else {

1838

if(debug){

1332

if (debug){

1839

1333

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

1840

1334

" it, or wait\n");

1841

1335

}

1848

1342

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

1849

1343

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

1850

1344

waited_time.tv_sec = (now.tv_sec

1851

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

1345

- mc.current_server->last_seen.tv_sec);

1852

1346

waited_time.tv_nsec = (now.tv_nsec

1853

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

1347

- mc.current_server->last_seen.tv_nsec);

1854

1348

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

1855

1349

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

1856

1350

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

1858

1352

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

1859

1353

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

1860

1354

1861

if(debug){

1355

if (debug){

1862

1356

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

1863

1357

block_time);

1864

1358

}

1865

1359

1866

1360

if(block_time <= 0){

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);

1361

ret = start_mandos_communication(mc.current_server->ip,

1362

mc.current_server->port,

1363

mc.current_server->if_index,

1364

mc.current_server->af);

1871

1365

if(ret == 0){

1872

avahi_simple_poll_quit(s);

1366

avahi_simple_poll_quit(mc.simple_poll);

1873

1367

return 0;

1874

1368

}

1875

1369

ret = clock_gettime(CLOCK_MONOTONIC,

1876

&mc->current_server->last_seen);

1370

&mc.current_server->last_seen);

1877

1371

if(ret == -1){

1878

1372

perror_plus("clock_gettime");

1879

1373

return -1;

1880

1374

}

1881

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

1375

mc.current_server = mc.current_server->next;

1882

1376

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

1883

1377

servers, but don't block */

1884

1378

}

1886

1380

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

1887

1381

}

1888

1382

if(ret != 0){

1889

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

1383

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

1890

1384

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

1891

1385

}

1892

1386

}

1893

1387

}

1894

1388

}

1895

1389

1896

__attribute__((nonnull))

1897

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

1390

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

1898

1391

const float delay){

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__ */

1392

struct dirent **direntries;

1393

struct dirent *direntry;

1394

int ret;

1395

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

1396

alphasort);

1927

1397

if(numhooks == -1){

1928

1398

perror_plus("scandir");

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){

1399

} else {

1400

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

1401

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

1402

direntry = direntries[i];

1403

char *fullname = NULL;

1404

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

1405

if(ret < 0){

1990

1406

perror_plus("asprintf");

1991

_exit(EX_OSERR);

1992

}

1993

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

1994

if(ret == -1){

1407

continue;

1408

}

1409

if(debug){

1410

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

1411

direntry->d_name);

1412

}

1413

pid_t hook_pid = fork();

1414

if(hook_pid == 0){

1415

/* Child */

1416

/* Raise privileges */

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1428

/* Set group */

1429

errno = 0;

1430

ret = setgid(0);

1431

if(ret == -1){

1432

perror_plus("setgid");

1433

}

1434

/* Reset supplementary groups */

1435

errno = 0;

1436

ret = setgroups(0, NULL);

1437

if(ret == -1){

1438

perror_plus("setgroups");

1439

}

1440

dup2(devnull, STDIN_FILENO);

1441

close(devnull);

1442

dup2(STDERR_FILENO, STDOUT_FILENO);

1443

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

1444

if(ret == -1){

1445

perror_plus("setenv");

1446

_exit(EX_OSERR);

1447

}

1448

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

1449

if(ret == -1){

1450

perror_plus("setenv");

1451

_exit(EX_OSERR);

1452

}

1453

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

1454

if(ret == -1){

1455

perror_plus("setenv");

1456

_exit(EX_OSERR);

1457

}

1458

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

1459

if(ret == -1){

1460

perror_plus("setenv");

1461

_exit(EX_OSERR);

1462

}

1463

char *delaystring;

1464

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

1465

if(ret == -1){

1466

perror_plus("asprintf");

1467

_exit(EX_OSERR);

1468

}

1469

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

1470

if(ret == -1){

1471

free(delaystring);

1472

perror_plus("setenv");

1473

_exit(EX_OSERR);

1474

}

1995

1475

free(delaystring);

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((int)TEMP_FAILURE_RETRY(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 = (int)TEMP_FAILURE_RETRY(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((int)TEMP_FAILURE_RETRY(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 = (int)TEMP_FAILURE_RETRY(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 = (int)TEMP_FAILURE_RETRY(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 = (int)TEMP_FAILURE_RETRY(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;

1476

if(connect_to != NULL){

1477

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

1478

if(ret == -1){

1479

perror_plus("setenv");

1480

_exit(EX_OSERR);

1481

}

1482

}

1483

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

1484

perror_plus("execl");

1485

_exit(EXIT_FAILURE);

1486

}

1487

} else {

1488

int status;

1489

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

1490

perror_plus("waitpid");

1491

free(fullname);

1492

continue;

1493

}

1494

if(WIFEXITED(status)){

1495

if(WEXITSTATUS(status) != 0){

1496

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

1497

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

1498

WEXITSTATUS(status));

1499

free(fullname);

1500

continue;

1501

}

1502

} else if(WIFSIGNALED(status)){

1503

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

1504

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

1505

WTERMSIG(status));

1506

free(fullname);

1507

continue;

1508

} else {

1509

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

1510

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

1511

free(fullname);

1512

continue;

1513

}

1514

}

1515

free(fullname);

1516

if(debug){

1517

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

1518

direntry->d_name);

1519

}

1520

}

1521

close(devnull);

1522

}

1523

return true;

2286

1524

}

2287

1525

2288

1526

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 };

2293

1527

AvahiSServiceBrowser *sb = NULL;

2294

error_t ret_errno;

1528

int error;

2295

1529

int ret;

2296

1530

intmax_t tmpmax;

2297

1531

char *tmp;

2298

1532

int exitcode = EXIT_SUCCESS;

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;

1533

const char *interface = "";

1534

struct ifreq network;

1535

int sd = -1;

1536

bool take_down_interface = false;

1537

uid_t uid;

1538

gid_t gid;

1539

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

1540

bool tempdir_created = false;

2304

1541

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2305

1542

const char *seckey = PATHDIR "/" SECKEY;

2306

1543

const char *pubkey = PATHDIR "/" PUBKEY;

2307

const char *dh_params_file = NULL;

2308

char *interfaces_hooks = NULL;

2309

1544

2310

1545

bool gnutls_initialized = false;

2311

1546

bool gpgme_initialized = false;

2363

1598

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

2364

1599

" Diffie-Hellman key exchange",

2365

1600

.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 },

2371

1601

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

2372

1602

.arg = "STRING",

2373

1603

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

2407

1637

connect_to = arg;

2408

1638

break;

2409

1639

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

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

}

1640

interface = arg;

2415

1641

break;

2416

1642

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

2417

1643

seckey = arg;

2428

1654

}

2429

1655

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

2430

1656

break;

2431

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

2432

dh_params_file = arg;

2433

break;

2434

1657

case 130: /* --priority */

2435

1658

mc.priority = arg;

2436

1659

break;

2492

1715

goto end;

2493

1716

}

2494

1717

}

2495

1718

2496

1719

{

2497

1720

/* Work around Debian bug #633582:

2498

1721

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

2499

1722

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");

1723

/* Re-raise priviliges */

1724

errno = 0;

1725

ret = seteuid(0);

1726

if(ret == -1){

1727

perror_plus("seteuid");

2505

1728

} else {

2506

1729

struct stat st;

2507

1730

2525

1748

TEMP_FAILURE_RETRY(close(seckey_fd));

2526

1749

}

2527

1750

}

2528

1751

2529

1752

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

2530

1753

int pubkey_fd = open(pubkey, O_RDONLY);

2531

1754

if(pubkey_fd == -1){

2546

1769

TEMP_FAILURE_RETRY(close(pubkey_fd));

2547

1770

}

2548

1771

}

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

TEMP_FAILURE_RETRY(close(dhparams_fd));

2568

}

2569

}

2570

1772

2571

1773

/* Lower privileges */

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;

1774

errno = 0;

1775

ret = seteuid(uid);

1776

if(ret == -1){

1777

perror_plus("seteuid");

2593

1778

}

2594

1779

}

2595

1780

}

2596

1781

2597

1782

/* Run network hooks */

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);

1783

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

1784

goto end;

2610

1785

}

2611

1786

2612

1787

if(not debug){

2613

1788

avahi_set_log_function(empty_log);

2614

1789

}

2615

1790

1791

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

1792

struct dirent **direntries;

1793

/* First look for interfaces that are up */

1794

ret = scandir(sys_class_net, &direntries, up_interface,

1795

alphasort);

1796

if(ret == 0){

1797

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

1798

free(direntries);

1799

ret = scandir(sys_class_net, &direntries, good_interface,

1800

alphasort);

1801

}

1802

if(ret >= 1){

1803

/* Pick the first interface returned */

1804

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

1805

if(debug){

1806

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

1807

}

1808

if(interface == NULL){

1809

perror_plus("malloc");

1810

free(direntries);

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

free(direntries);

1815

} else {

1816

free(direntries);

1817

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

1818

exitcode = EXIT_FAILURE;

1819

goto end;

1820

}

1821

}

1822

2616

1823

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

2617

1824

from the signal handler */

2618

1825

/* Initialize the pseudo-RNG for Avahi */

2619

1826

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

2620

simple_poll = avahi_simple_poll_new();

2621

if(simple_poll == NULL){

1827

mc.simple_poll = avahi_simple_poll_new();

1828

if(mc.simple_poll == NULL){

2622

1829

fprintf_plus(stderr,

2623

1830

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

2624

1831

exitcode = EX_UNAVAILABLE;

2688

1895

}

2689

1896

}

2690

1897

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;

1898

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

1899

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

1900

if_index = (AvahiIfIndex) if_nametoindex(interface);

1901

if(if_index == 0){

1902

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

1903

exitcode = EX_UNAVAILABLE;

1904

goto end;

1905

}

1906

1907

if(quit_now){

1908

goto end;

1909

}

1910

1911

/* Re-raise priviliges */

1912

errno = 0;

1913

ret = seteuid(0);

1914

if(ret == -1){

1915

perror_plus("seteuid");

1916

}

1917

1918

#ifdef __linux__

1919

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1920

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

1921

ret = klogctl(8, NULL, 5);

1922

bool restore_loglevel = true;

1923

if(ret == -1){

1924

restore_loglevel = false;

1925

perror_plus("klogctl");

1926

}

1927

#endif /* __linux__ */

1928

1929

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1930

if(sd < 0){

1931

perror_plus("socket");

1932

exitcode = EX_OSERR;

1933

#ifdef __linux__

1934

if(restore_loglevel){

1935

ret = klogctl(7, NULL, 0);

1936

if(ret == -1){

1937

perror_plus("klogctl");

1938

}

1939

}

1940

#endif /* __linux__ */

1941

/* Lower privileges */

1942

errno = 0;

1943

ret = seteuid(uid);

1944

if(ret == -1){

1945

perror_plus("seteuid");

1946

}

1947

goto end;

1948

}

1949

strcpy(network.ifr_name, interface);

1950

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

1951

if(ret == -1){

1952

perror_plus("ioctl SIOCGIFFLAGS");

1953

#ifdef __linux__

1954

if(restore_loglevel){

1955

ret = klogctl(7, NULL, 0);

1956

if(ret == -1){

1957

perror_plus("klogctl");

1958

}

1959

}

1960

#endif /* __linux__ */

1961

exitcode = EX_OSERR;

1962

/* Lower privileges */

1963

errno = 0;

1964

ret = seteuid(uid);

1965

if(ret == -1){

1966

perror_plus("seteuid");

1967

}

1968

goto end;

1969

}

1970

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

1971

network.ifr_flags |= IFF_UP;

1972

take_down_interface = true;

1973

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

1974

if(ret == -1){

1975

take_down_interface = false;

1976

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1977

exitcode = EX_OSERR;

1978

#ifdef __linux__

1979

if(restore_loglevel){

1980

ret = klogctl(7, NULL, 0);

1981

if(ret == -1){

1982

perror_plus("klogctl");

2742

1983

}

2743

1984

}

1985

#endif /* __linux__ */

1986

/* Lower privileges */

1987

errno = 0;

1988

ret = seteuid(uid);

1989

if(ret == -1){

1990

perror_plus("seteuid");

1991

}

1992

goto end;

1993

}

1994

}

1995

/* Sleep checking until interface is running.

1996

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

1997

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

1998

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

1999

if(ret == -1){

2000

perror_plus("ioctl SIOCGIFFLAGS");

2001

} else if(network.ifr_flags & IFF_RUNNING){

2744

2002

break;

2745

2003

}

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);

2004

struct timespec sleeptime = { .tv_nsec = 250000000 };

2005

ret = nanosleep(&sleeptime, NULL);

2006

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

2007

perror_plus("nanosleep");

2008

}

2009

}

2010

if(not take_down_interface){

2011

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

2012

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

2013

if(ret == -1){

2014

perror_plus("close");

2015

}

2016

}

2017

#ifdef __linux__

2018

if(restore_loglevel){

2019

/* Restores kernel loglevel to default */

2020

ret = klogctl(7, NULL, 0);

2021

if(ret == -1){

2022

perror_plus("klogctl");

2023

}

2024

}

2025

#endif /* __linux__ */

2026

/* Lower privileges */

2027

errno = 0;

2028

/* Lower privileges */

2029

ret = seteuid(uid);

2030

if(ret == -1){

2031

perror_plus("seteuid");

2032

}

2774

2033

}

2775

2034

2776

2035

if(quit_now){

2777

2036

goto end;

2778

2037

}

2779

2038

2780

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

2039

ret = init_gnutls_global(pubkey, seckey);

2781

2040

if(ret == -1){

2782

2041

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

2783

2042

exitcode = EX_UNAVAILABLE;

2790

2049

goto end;

2791

2050

}

2792

2051

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){

2052

if(mkdtemp(tempdir) == NULL){

2803

2053

perror_plus("mkdtemp");

2804

2054

goto end;

2805

2055

}

2056

tempdir_created = true;

2806

2057

2807

2058

if(quit_now){

2808

2059

goto end;

2809

2060

}

2810

2061

2811

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

2062

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

2812

2063

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

2813

2064

exitcode = EX_UNAVAILABLE;

2814

2065

goto end;

2824

2075

/* Connect directly, do not use Zeroconf */

2825

2076

/* (Mainly meant for debugging) */

2826

2077

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

2827

2828

2078

if(address == NULL){

2829

2079

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

2830

2080

exitcode = EX_USAGE;

2835

2085

goto end;

2836

2086

}

2837

2087

2838

in_port_t port;

2088

uint16_t port;

2839

2089

errno = 0;

2840

2090

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

2841

2091

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

2842

or tmpmax != (in_port_t)tmpmax){

2092

or tmpmax != (uint16_t)tmpmax){

2843

2093

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

2844

2094

exitcode = EX_USAGE;

2845

2095

goto end;

2846

2096

}

2847

2097

2848

2098

if(quit_now){

2849

2099

goto end;

2850

2100

}

2851

2101

2852

port = (in_port_t)tmpmax;

2102

port = (uint16_t)tmpmax;

2853

2103

*address = '\0';

2854

2104

/* Colon in address indicates IPv6 */

2855

2105

int af;

2871

2121

}

2872

2122

2873

2123

while(not quit_now){

2874

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

2875

&mc);

2124

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

2876

2125

if(quit_now or ret == 0){

2877

2126

break;

2878

2127

}

2880

2129

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

2881

2130

(int)retry_interval);

2882

2131

}

2883

sleep((unsigned int)retry_interval);

2132

sleep((int)retry_interval);

2884

2133

}

2885

2134

2886

if(not quit_now){

2135

if (not quit_now){

2887

2136

exitcode = EXIT_SUCCESS;

2888

2137

}

2889

2138

2904

2153

config.publish_domain = 0;

2905

2154

2906

2155

/* Allocate a new server */

2907

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2908

&config, NULL, NULL, &ret_errno);

2156

mc.server = avahi_server_new(avahi_simple_poll_get

2157

(mc.simple_poll), &config, NULL,

2158

NULL, &error);

2909

2159

2910

2160

/* Free the Avahi configuration data */

2911

2161

avahi_server_config_free(&config);

2914

2164

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

2915

2165

if(mc.server == NULL){

2916

2166

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

2917

avahi_strerror(ret_errno));

2167

avahi_strerror(error));

2918

2168

exitcode = EX_UNAVAILABLE;

2919

2169

goto end;

2920

2170

}

2926

2176

/* Create the Avahi service browser */

2927

2177

sb = avahi_s_service_browser_new(mc.server, if_index,

2928

2178

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2929

NULL, 0, browse_callback,

2930

(void *)&mc);

2179

NULL, 0, browse_callback, NULL);

2931

2180

if(sb == NULL){

2932

2181

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

2933

2182

avahi_strerror(avahi_server_errno(mc.server)));

2944

2193

if(debug){

2945

2194

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

2946

2195

}

2947

2948

ret = avahi_loop_with_timeout(simple_poll,

2949

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

2196

2197

ret = avahi_loop_with_timeout(mc.simple_poll,

2198

(int)(retry_interval * 1000));

2950

2199

if(debug){

2951

2200

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

2952

2201

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

2959

2208

}

2960

2209

2961

2210

/* Cleanup things */

2962

free(mc.interfaces);

2963

2964

2211

if(sb != NULL)

2965

2212

avahi_s_service_browser_free(sb);

2966

2213

2967

2214

if(mc.server != NULL)

2968

2215

avahi_server_free(mc.server);

2969

2216

2970

if(simple_poll != NULL)

2971

avahi_simple_poll_free(simple_poll);

2217

if(mc.simple_poll != NULL)

2218

avahi_simple_poll_free(mc.simple_poll);

2972

2219

2973

2220

if(gnutls_initialized){

2974

2221

gnutls_certificate_free_credentials(mc.cred);

2986

2233

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

2987

2234

while(mc.current_server != NULL){

2988

2235

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

2997

2236

free(mc.current_server);

2998

2237

mc.current_server = next;

2999

2238

}

3000

2239

}

3001

2240

3002

/* Re-raise privileges */

2241

/* Run network hooks */

2242

run_network_hooks("stop", interface, delay);

2243

2244

/* Re-raise priviliges */

3003

2245

{

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

}

2246

errno = 0;

2247

ret = seteuid(0);

2248

if(ret == -1){

2249

perror_plus("seteuid");

3031

2250

}

3032

2251

3033

ret_errno = lower_privileges_permanently();

3034

if(ret_errno != 0){

3035

errno = ret_errno;

3036

perror_plus("Failed to lower privileges permanently");

2252

/* Take down the network interface */

2253

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

2254

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

2255

if(ret == -1){

2256

perror_plus("ioctl SIOCGIFFLAGS");

2257

} else if(network.ifr_flags & IFF_UP){

2258

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

2259

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

2260

if(ret == -1){

2261

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2262

}

2263

}

2264

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

2265

if(ret == -1){

2266

perror_plus("close");

2267

}

3037

2268

}

3038

2269

}

3039

3040

free(interfaces_to_take_down);

3041

free(interfaces_hooks);

2270

/* Lower privileges permanently */

2271

errno = 0;

2272

ret = setuid(uid);

2273

if(ret == -1){

2274

perror_plus("setuid");

2275

}

3042

2276

3043

2277

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

3044

if(tempdir != NULL){

2278

if(tempdir_created){

3045

2279

struct dirent **direntries = NULL;

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

}

2280

struct dirent *direntry = NULL;

2281

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

2282

alphasort);

2283

if (numentries > 0){

2284

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

2285

direntry = direntries[i];

2286

char *fullname = NULL;

2287

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

2288

direntry->d_name);

2289

if(ret < 0){

2290

perror_plus("asprintf");

2291

continue;

2292

}

2293

ret = remove(fullname);

2294

if(ret == -1){

2295

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

2296

strerror(errno));

2297

}

2298

free(fullname);

3085

2299

}

3086

TEMP_FAILURE_RETRY(close(tempdir_fd));

2300

}

2301

2302

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

2303

free(direntries);

2304

if (numentries == -1){

2305

perror_plus("scandir");

2306

}

2307

ret = rmdir(tempdir);

2308

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

2309

perror_plus("rmdir");

3087

2310

}

3088

2311

}

3089

2312