/mandos/trunk : revision 237.4.54

9

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

10

*

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* 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(),

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

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

45

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

46

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

55

opendir(), DIR */

56

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

57

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

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inet_pton(), connect() */

59

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

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inet_pton(), connect(),

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getnameinfo() */

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#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() */

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

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program_invocation_short_name */

67

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

73

*/

74

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

75

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

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

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

76

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

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unlinkat() */

78

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

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,

92

93

argz_delete(), argz_append(),

93

94

argz_stringify(), argz_add(),

94

95

argz_count() */

96

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

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EAI_SYSTEM, gai_strerror() */

95

98

96

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#ifdef __linux__

97

100

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

139

142

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

140

143

char *connect_to = NULL;

141

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

142

146

uid_t uid = 65534;

143

147

gid_t gid = 65534;

144

148

145

149

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

146

150

typedef struct server{

147

151

const char *ip;

148

uint16_t port;

152

in_port_t port;

149

153

AvahiIfIndex if_index;

150

154

int af;

151

155

struct timespec last_seen;

155

159

156

160

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

157

161

typedef struct {

158

AvahiSimplePoll *simple_poll;

159

162

AvahiServer *server;

160

163

gnutls_certificate_credentials_t cred;

161

164

unsigned int dh_bits;

163

166

const char *priority;

164

167

gpgme_ctx_t ctx;

165

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

166

171

} mandos_context;

167

172

168

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

169

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

170

.dh_bits = 1024, .priority = "SECURE256"

171

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

172

.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

173

175

174

176

sig_atomic_t quit_now = 0;

175

177

int signal_received = 0;

183

185

perror(print_text);

184

186

}

185

187

186

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

188

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

187

189

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

188

190

va_list ap;

189

191

va_start (ap, format);

190

192

191

193

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

192

194

program_invocation_short_name));

193

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

195

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

194

196

}

195

197

196

198

/*

198

200

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

199

201

* "buffer_length" is how much is already used.

200

202

*/

203

__attribute__((nonnull, warn_unused_result))

201

204

size_t incbuffer(char **buffer, size_t buffer_length,

202

205

size_t buffer_capacity){

203

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

204

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

205

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;

206

213

return 0;

207

214

}

215

*buffer = new_buf;

208

216

buffer_capacity += BUFFER_SIZE;

209

217

}

210

218

return buffer_capacity;

211

219

}

212

220

213

221

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

214

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

215

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){

216

225

int ret;

217

226

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

218

227

if(new_server == NULL){

225

234

.af = af };

226

235

if(new_server->ip == NULL){

227

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);

228

252

return false;

229

253

}

230

254

/* Special case of first server */

231

if (mc.current_server == NULL){

255

if(*current_server == NULL){

232

256

new_server->next = new_server;

233

257

new_server->prev = new_server;

234

mc.current_server = new_server;

235

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

258

*current_server = new_server;

236

259

} else {

237

new_server->next = mc.current_server;

238

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;

239

263

new_server->prev->next = new_server;

240

mc.current_server->prev = new_server;

241

}

242

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

243

if(ret == -1){

244

perror_plus("clock_gettime");

245

return false;

264

(*current_server)->prev = new_server;

246

265

}

247

266

return true;

248

267

}

250

269

/*

251

270

* Initialize GPGME.

252

271

*/

253

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

254

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){

255

277

gpgme_error_t rc;

256

278

gpgme_engine_info_t engine_info;

257

279

258

259

280

/*

260

281

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

261

282

*/

262

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

263

284

int ret;

264

285

int fd;

265

286

gpgme_data_t pgp_data;

277

298

return false;

278

299

}

279

300

280

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

281

302

if(rc != GPG_ERR_NO_ERROR){

282

303

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

283

304

gpgme_strsource(rc), gpgme_strerror(rc));

327

348

}

328

349

329

350

/* Create new GPGME "context" */

330

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

351

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

331

352

if(rc != GPG_ERR_NO_ERROR){

332

353

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

333

354

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

346

367

* Decrypt OpenPGP data.

347

368

* Returns -1 on error

348

369

*/

370

__attribute__((nonnull, warn_unused_result))

349

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

350

372

size_t crypto_size,

351

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

352

375

gpgme_data_t dh_crypto, dh_plain;

353

376

gpgme_error_t rc;

354

377

ssize_t ret;

380

403

381

404

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

382

405

data buffer */

383

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

406

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

384

407

if(rc != GPG_ERR_NO_ERROR){

385

408

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

386

409

gpgme_strsource(rc), gpgme_strerror(rc));

387

410

plaintext_length = -1;

388

411

if(debug){

389

412

gpgme_decrypt_result_t result;

390

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

391

414

if(result == NULL){

392

415

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

393

416

} else {

470

493

return plaintext_length;

471

494

}

472

495

473

static const char * safer_gnutls_strerror(int value){

474

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

475

-Wunreachable-code */

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

476

499

if(ret == NULL)

477

500

ret = "(unknown)";

478

501

return ret;

479

502

}

480

503

481

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

482

506

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

483

507

const char* string){

484

508

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

485

509

}

486

510

511

__attribute__((nonnull, warn_unused_result))

487

512

static int init_gnutls_global(const char *pubkeyfilename,

488

const char *seckeyfilename){

513

const char *seckeyfilename,

514

mandos_context *mc){

489

515

int ret;

490

516

491

517

if(debug){

508

534

}

509

535

510

536

/* OpenPGP credentials */

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

512

538

if(ret != GNUTLS_E_SUCCESS){

513

539

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

514

540

safer_gnutls_strerror(ret));

524

550

}

525

551

526

552

ret = gnutls_certificate_set_openpgp_key_file

527

(mc.cred, pubkeyfilename, seckeyfilename,

553

(mc->cred, pubkeyfilename, seckeyfilename,

528

554

GNUTLS_OPENPGP_FMT_BASE64);

529

555

if(ret != GNUTLS_E_SUCCESS){

530

556

fprintf_plus(stderr,

536

562

}

537

563

538

564

/* GnuTLS server initialization */

539

ret = gnutls_dh_params_init(&mc.dh_params);

565

ret = gnutls_dh_params_init(&mc->dh_params);

540

566

if(ret != GNUTLS_E_SUCCESS){

541

567

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

542

568

" initialization: %s\n",

543

569

safer_gnutls_strerror(ret));

544

570

goto globalfail;

545

571

}

546

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

572

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

547

573

if(ret != GNUTLS_E_SUCCESS){

548

574

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

549

575

safer_gnutls_strerror(ret));

550

576

goto globalfail;

551

577

}

552

578

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

579

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

554

580

555

581

return 0;

556

582

557

583

globalfail:

558

584

559

gnutls_certificate_free_credentials(mc.cred);

585

gnutls_certificate_free_credentials(mc->cred);

560

586

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

587

gnutls_dh_params_deinit(mc->dh_params);

562

588

return -1;

563

589

}

564

590

565

static int init_gnutls_session(gnutls_session_t *session){

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

566

594

int ret;

567

595

/* GnuTLS session creation */

568

596

do {

580

608

{

581

609

const char *err;

582

610

do {

583

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

611

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

584

612

if(quit_now){

585

613

gnutls_deinit(*session);

586

614

return -1;

597

625

598

626

do {

599

627

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

600

mc.cred);

628

mc->cred);

601

629

if(quit_now){

602

630

gnutls_deinit(*session);

603

631

return -1;

613

641

/* ignore client certificate if any. */

614

642

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

615

643

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

617

645

618

646

return 0;

619

647

}

623

651

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

624

652

625

653

/* Called when a Mandos server is found */

626

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

654

__attribute__((nonnull, warn_unused_result))

655

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

627

656

AvahiIfIndex if_index,

628

int af){

657

int af, mandos_context *mc){

629

658

int ret, tcp_sd = -1;

630

659

ssize_t sret;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

660

struct sockaddr_storage to;

635

661

char *buffer = NULL;

636

662

char *decrypted_buffer = NULL;

637

663

size_t buffer_length = 0;

661

687

return -1;

662

688

}

663

689

664

ret = init_gnutls_session(&session);

690

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

691

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

692

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

693

bool match = false;

694

{

695

char *interface = NULL;

696

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

697

interface))){

698

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

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

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

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

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

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

665

723

if(ret != 0){

666

724

return -1;

667

725

}

668

726

669

727

if(debug){

670

728

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

671

PRIu16 "\n", ip, port);

729

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

672

730

}

673

731

674

732

tcp_sd = socket(pf, SOCK_STREAM, 0);

686

744

687

745

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

688

746

if(af == AF_INET6){

689

to.in6.sin6_family = (sa_family_t)af;

690

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

747

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

748

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

691

749

} else { /* IPv4 */

692

to.in.sin_family = (sa_family_t)af;

693

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

750

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

751

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

694

752

}

695

753

if(ret < 0 ){

696

754

int e = errno;

705

763

goto mandos_end;

706

764

}

707

765

if(af == AF_INET6){

708

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

709

-Wconversion and

710

-Wunreachable-code */

711

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

713

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

714

-Wunreachable-code*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

715

769

if(if_index == AVAHI_IF_UNSPEC){

716

770

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

717

771

" incomplete without a network interface\n");

719

773

goto mandos_end;

720

774

}

721

775

/* Set the network interface number as scope */

722

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

723

777

}

724

778

} else {

725

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

726

-Wconversion and

727

-Wunreachable-code */

779

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

728

780

}

729

781

730

782

if(quit_now){

738

790

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

739

791

perror_plus("if_indextoname");

740

792

} else {

741

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

742

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

793

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

794

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

743

795

}

744

796

} else {

745

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

746

ip, port);

797

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

798

ip, (uintmax_t)port);

747

799

}

748

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

749

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

const char *pcret;

751

802

if(af == AF_INET6){

752

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

753

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

754

807

} else {

755

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

756

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

757

812

}

758

if(pcret == NULL){

759

perror_plus("inet_ntop");

760

} else {

761

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

762

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

763

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

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

817

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

818

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

764

819

}

765

820

}

766

821

770

825

}

771

826

772

827

if(af == AF_INET6){

773

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

828

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

829

sizeof(struct sockaddr_in6));

774

830

} else {

775

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

831

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

832

sizeof(struct sockaddr_in));

776

833

}

777

834

if(ret < 0){

778

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

835

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

779

836

int e = errno;

780

837

perror_plus("connect");

781

838

errno = e;

942

999

if(buffer_length > 0){

943

1000

ssize_t decrypted_buffer_size;

944

1001

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

945

&decrypted_buffer);

1002

&decrypted_buffer, mc);

946

1003

if(decrypted_buffer_size >= 0){

947

1004

948

1005

written = 0;

996

1053

return retval;

997

1054

}

998

1055

1056

__attribute__((nonnull))

999

1057

static void resolve_callback(AvahiSServiceResolver *r,

1000

1058

AvahiIfIndex interface,

1001

1059

AvahiProtocol proto,

1009

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1010

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1011

1069

flags,

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

1014

1074

1015

1075

/* Called whenever a service has been resolved successfully or

1016

1076

timed out */

1017

1077

1018

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1019

1080

return;

1020

1081

}

1021

1082

1025

1086

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

1026

1087

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

1027

1088

domain,

1028

avahi_strerror(avahi_server_errno(mc.server)));

1089

avahi_strerror(avahi_server_errno

1090

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

1029

1091

break;

1030

1092

1031

1093

case AVAHI_RESOLVER_FOUND:

1037

1099

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

1038

1100

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

1039

1101

}

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1102

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

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

1042

1106

if(ret == 0){

1043

avahi_simple_poll_quit(mc.simple_poll);

1107

avahi_simple_poll_quit(simple_poll);

1044

1108

} else {

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1109

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

1110

avahi_proto_to_af(proto),

1111

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

1047

1112

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

1048

1113

" list\n", name);

1049

1114

}

1062

1127

const char *domain,

1063

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1064

1129

flags,

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

1067

1134

1068

1135

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

1069

1136

is removed from the LAN */

1077

1144

case AVAHI_BROWSER_FAILURE:

1078

1145

1079

1146

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1147

avahi_strerror(avahi_server_errno

1148

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

1149

avahi_simple_poll_quit(simple_poll);

1082

1150

return;

1083

1151

1084

1152

case AVAHI_BROWSER_NEW:

1087

1155

the callback function is called the Avahi server will free the

1088

1156

resolver for us. */

1089

1157

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1158

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

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1093

1162

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

1094

1163

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1164

avahi_strerror(avahi_server_errno

1165

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

1096

1166

break;

1097

1167

1098

1168

case AVAHI_BROWSER_REMOVE:

1117

1187

signal_received = sig;

1118

1188

int old_errno = errno;

1119

1189

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1122

1192

}

1123

1193

errno = old_errno;

1124

1194

}

1125

1195

1196

__attribute__((nonnull, warn_unused_result))

1126

1197

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

1127

1198

int ret;

1128

1199

error_t ret_errno;

1147

1218

return true;

1148

1219

}

1149

1220

1221

__attribute__((nonnull, warn_unused_result))

1150

1222

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

1151

1223

1152

1224

/* Reject the loopback device */

1194

1266

* corresponds to an acceptable network device.

1195

1267

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

1196

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1197

1270

int good_interface(const struct dirent *if_entry){

1198

1271

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

1199

1272

return 0;

1217

1290

/*

1218

1291

* This function determines if a network interface is up.

1219

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1220

1294

bool interface_is_up(const char *interface){

1221

1295

struct ifreq ifr;

1222

1296

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

1233

1307

/*

1234

1308

* This function determines if a network interface is running

1235

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1236

1311

bool interface_is_running(const char *interface){

1237

1312

struct ifreq ifr;

1238

1313

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

1246

1321

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

1247

1322

}

1248

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1249

1325

int notdotentries(const struct dirent *direntry){

1250

1326

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

1251

1327

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

1258

1334

}

1259

1335

1260

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1261

1338

int runnable_hook(const struct dirent *direntry){

1262

1339

int ret;

1263

1340

size_t sret;

1271

1348

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

1272

1349

"abcdefghijklmnopqrstuvwxyz"

1273

1350

"0123456789"

1274

"_-");

1351

"_.-");

1275

1352

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

1276

1353

/* Contains non-allowed characters */

1277

1354

if(debug){

1281

1358

return 0;

1282

1359

}

1283

1360

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1361

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

1292

1362

if(ret == -1){

1293

1363

if(debug){

1294

1364

perror_plus("Could not stat hook");

1318

1388

return 1;

1319

1389

}

1320

1390

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1322

1394

int ret;

1323

1395

struct timespec now;

1324

1396

struct timespec waited_time;

1325

1397

intmax_t block_time;

1326

1398

1327

1399

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1400

if(mc->current_server == NULL){

1401

if(debug){

1330

1402

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

1331

1403

" No timeout!\n");

1332

1404

}

1333

1405

ret = avahi_simple_poll_iterate(s, -1);

1334

1406

} else {

1335

if (debug){

1407

if(debug){

1336

1408

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

1337

1409

" it, or wait\n");

1338

1410

}

1345

1417

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

1346

1418

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

1347

1419

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1420

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

1349

1421

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1422

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

1351

1423

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

1352

1424

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

1353

1425

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

1355

1427

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

1356

1428

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

1357

1429

1358

if (debug){

1430

if(debug){

1359

1431

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

1360

1432

block_time);

1361

1433

}

1362

1434

1363

1435

if(block_time <= 0){

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1436

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

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1368

1440

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1441

avahi_simple_poll_quit(s);

1370

1442

return 0;

1371

1443

}

1372

1444

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1445

&mc->current_server->last_seen);

1374

1446

if(ret == -1){

1375

1447

perror_plus("clock_gettime");

1376

1448

return -1;

1377

1449

}

1378

mc.current_server = mc.current_server->next;

1450

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

1379

1451

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

1380

1452

servers, but don't block */

1381

1453

}

1383

1455

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

1384

1456

}

1385

1457

if(ret != 0){

1386

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

1458

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

1387

1459

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

1388

1460

}

1389

1461

}

1391

1463

}

1392

1464

1393

1465

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

1466

__attribute__((warn_unused_result))

1394

1467

error_t raise_privileges(void){

1395

1468

error_t old_errno = errno;

1396

1469

error_t ret_errno = 0;

1397

1470

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

1398

1471

ret_errno = errno;

1399

perror_plus("seteuid");

1400

1472

}

1401

1473

errno = old_errno;

1402

1474

return ret_errno;

1403

1475

}

1404

1476

1405

1477

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

1478

__attribute__((warn_unused_result))

1406

1479

error_t raise_privileges_permanently(void){

1407

1480

error_t old_errno = errno;

1408

1481

error_t ret_errno = raise_privileges();

1412

1485

}

1413

1486

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

1414

1487

ret_errno = errno;

1415

perror_plus("seteuid");

1416

1488

}

1417

1489

errno = old_errno;

1418

1490

return ret_errno;

1419

1491

}

1420

1492

1421

1493

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

1494

__attribute__((warn_unused_result))

1422

1495

error_t lower_privileges(void){

1423

1496

error_t old_errno = errno;

1424

1497

error_t ret_errno = 0;

1425

1498

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

1426

1499

ret_errno = errno;

1427

perror_plus("seteuid");

1428

1500

}

1429

1501

errno = old_errno;

1430

1502

return ret_errno;

1431

1503

}

1432

1504

1433

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1434

1507

error_t lower_privileges_permanently(void){

1435

1508

error_t old_errno = errno;

1436

1509

error_t ret_errno = 0;

1437

1510

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

1438

1511

ret_errno = errno;

1439

perror_plus("setuid");

1440

1512

}

1441

1513

errno = old_errno;

1442

1514

return ret_errno;

1443

1515

}

1444

1516

1445

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

1517

__attribute__((nonnull))

1518

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

1446

1519

const float delay){

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

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

1538

runnable_hook, alphasort);

1539

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

1540

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

1541

alphasort);

1542

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

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1452

1547

if(numhooks == -1){

1453

1548

perror_plus("scandir");

1454

} else {

1455

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

1456

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

1457

direntry = direntries[i];

1458

char *fullname = NULL;

1459

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

1460

if(ret < 0){

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1559

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1461

1621

perror_plus("asprintf");

1462

continue;

1463

}

1464

if(debug){

1465

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

1466

direntry->d_name);

1467

}

1468

pid_t hook_pid = fork();

1469

if(hook_pid == 0){

1470

/* Child */

1471

/* Raise privileges */

1472

raise_privileges_permanently();

1473

/* Set group */

1474

errno = 0;

1475

ret = setgid(0);

1476

if(ret == -1){

1477

perror_plus("setgid");

1478

}

1479

/* Reset supplementary groups */

1480

errno = 0;

1481

ret = setgroups(0, NULL);

1482

if(ret == -1){

1483

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

char *delaystring;

1509

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

1510

if(ret == -1){

1511

perror_plus("asprintf");

1512

_exit(EX_OSERR);

1513

}

1514

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

1515

if(ret == -1){

1516

free(delaystring);

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1520

1626

free(delaystring);

1521

if(connect_to != NULL){

1522

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

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

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

1529

perror_plus("execl");

1530

_exit(EXIT_FAILURE);

1531

}

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

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

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

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

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

if(hook_pid == -1){

1654

perror_plus("fork");

1655

free(direntry);

1656

continue;

1657

}

1658

int status;

1659

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

1660

perror_plus("waitpid");

1661

free(direntry);

1662

continue;

1663

}

1664

if(WIFEXITED(status)){

1665

if(WEXITSTATUS(status) != 0){

1666

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

1667

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

1668

WEXITSTATUS(status));

1669

free(direntry);

1670

continue;

1671

}

1672

} else if(WIFSIGNALED(status)){

1673

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

1674

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

1675

WTERMSIG(status));

1676

free(direntry);

1677

continue;

1532

1678

} else {

1533

int status;

1534

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

1535

perror_plus("waitpid");

1536

free(fullname);

1537

continue;

1538

}

1539

if(WIFEXITED(status)){

1540

if(WEXITSTATUS(status) != 0){

1541

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

1542

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

1543

WEXITSTATUS(status));

1544

free(fullname);

1545

continue;

1546

}

1547

} else if(WIFSIGNALED(status)){

1548

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

1549

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

1550

WTERMSIG(status));

1551

free(fullname);

1552

continue;

1553

} else {

1554

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

1555

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

1556

free(fullname);

1557

continue;

1558

}

1559

}

1560

free(fullname);

1561

if(debug){

1562

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

1563

direntry->d_name);

1564

}

1565

}

1566

close(devnull);

1567

}

1568

return true;

1679

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

1680

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

1681

free(direntry);

1682

continue;

1683

}

1684

}

1685

if(debug){

1686

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

1687

direntry->d_name);

1688

}

1689

free(direntry);

1690

}

1691

free(direntries);

1692

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

1693

perror_plus("close");

1694

} else {

1695

hookdir_fd = -1;

1696

}

1697

close(devnull);

1569

1698

}

1570

1699

1700

__attribute__((nonnull, warn_unused_result))

1571

1701

error_t bring_up_interface(const char *const interface,

1572

1702

const float delay){

1573

int sd = -1;

1574

1703

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1704

int ret;

1577

1705

struct ifreq network;

1578

1706

unsigned int if_index = if_nametoindex(interface);

1579

1707

if(if_index == 0){

1588

1716

}

1589

1717

1590

1718

if(not interface_is_up(interface)){

1591

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

1719

error_t ret_errno = 0, ioctl_errno = 0;

1720

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

1592

1721

ret_errno = errno;

1593

1722

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

1594

1723

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

1724

errno = old_errno;

1595

1725

return ret_errno;

1596

1726

}

1597

network.ifr_flags |= IFF_UP;

1727

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

1598

1728

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1729

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

1730

if(sd == -1){

1601

1731

ret_errno = errno;

1602

1732

perror_plus("socket");

1603

1733

errno = old_errno;

1604

1734

return ret_errno;

1605

1735

}

1606

1736

1607

1737

if(quit_now){

1608

close(sd);

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1609

1742

errno = old_errno;

1610

1743

return EINTR;

1611

1744

}

1615

1748

interface);

1616

1749

}

1617

1750

1618

/* Raise priviliges */

1619

raise_privileges();

1751

/* Raise privileges */

1752

ret_errno = raise_privileges();

1753

if(ret_errno != 0){

1754

errno = ret_errno;

1755

perror_plus("Failed to raise privileges");

1756

}

1620

1757

1621

1758

#ifdef __linux__

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

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

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1759

int ret_linux;

1760

bool restore_loglevel = false;

1761

if(ret_errno == 0){

1762

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1763

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

1764

ret_linux = klogctl(8, NULL, 5);

1765

if(ret_linux == -1){

1766

perror_plus("klogctl");

1767

} else {

1768

restore_loglevel = true;

1769

}

1629

1770

}

1630

1771

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

1772

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

1773

ioctl_errno = errno;

1633

1774

#ifdef __linux__

1634

1775

if(restore_loglevel){

1635

1776

ret_linux = klogctl(7, NULL, 0);

1639

1780

}

1640

1781

#endif /* __linux__ */

1641

1782

1642

/* Lower privileges */

1643

lower_privileges();

1783

/* If raise_privileges() succeeded above */

1784

if(ret_errno == 0){

1785

/* Lower privileges */

1786

ret_errno = lower_privileges();

1787

if(ret_errno != 0){

1788

errno = ret_errno;

1789

perror_plus("Failed to lower privileges");

1790

}

1791

}

1644

1792

1645

1793

/* Close the socket */

1646

1794

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

1649

1797

}

1650

1798

1651

1799

if(ret_setflags == -1){

1652

errno = ret_errno;

1800

errno = ioctl_errno;

1653

1801

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

1802

errno = old_errno;

1655

return ret_errno;

1803

return ioctl_errno;

1656

1804

}

1657

1805

} else if(debug){

1658

1806

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

1676

1824

return 0;

1677

1825

}

1678

1826

1827

__attribute__((nonnull, warn_unused_result))

1679

1828

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

1829

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1684

1830

struct ifreq network;

1685

1831

unsigned int if_index = if_nametoindex(interface);

1686

1832

if(if_index == 0){

1689

1835

return ENXIO;

1690

1836

}

1691

1837

if(interface_is_up(interface)){

1838

error_t ret_errno = 0, ioctl_errno = 0;

1692

1839

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

1693

1840

ret_errno = errno;

1694

1841

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

1695

1842

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

1843

errno = old_errno;

1696

1844

return ret_errno;

1697

1845

}

1698

1846

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

1699

1847

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1848

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

1849

if(sd == -1){

1702

1850

ret_errno = errno;

1703

1851

perror_plus("socket");

1704

1852

errno = old_errno;

1710

1858

interface);

1711

1859

}

1712

1860

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

1861

/* Raise privileges */

1862

ret_errno = raise_privileges();

1863

if(ret_errno != 0){

1864

errno = ret_errno;

1865

perror_plus("Failed to raise privileges");

1866

}

1867

1868

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

1869

ioctl_errno = errno;

1870

1871

/* If raise_privileges() succeeded above */

1872

if(ret_errno == 0){

1873

/* Lower privileges */

1874

ret_errno = lower_privileges();

1875

if(ret_errno != 0){

1876

errno = ret_errno;

1877

perror_plus("Failed to lower privileges");

1878

}

1879

}

1721

1880

1722

1881

/* Close the socket */

1723

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

1882

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

1724

1883

if(ret == -1){

1725

1884

perror_plus("close");

1726

1885

}

1727

1886

1728

1887

if(ret_setflags == -1){

1729

errno = ret_errno;

1888

errno = ioctl_errno;

1730

1889

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

1890

errno = old_errno;

1732

return ret_errno;

1891

return ioctl_errno;

1733

1892

}

1734

1893

} else if(debug){

1735

1894

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

1741

1900

}

1742

1901

1743

1902

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

1903

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

1904

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

1905

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

1906

.interfaces = NULL, .interfaces_size = 0 };

1744

1907

AvahiSServiceBrowser *sb = NULL;

1745

1908

error_t ret_errno;

1746

1909

int ret;

1747

1910

intmax_t tmpmax;

1748

1911

char *tmp;

1749

1912

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

1913

char *interfaces_to_take_down = NULL;

1753

1914

size_t interfaces_to_take_down_size = 0;

1754

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

1755

bool tempdir_created = false;

1915

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

1916

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

1917

char *tempdir = NULL;

1756

1918

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1757

1919

const char *seckey = PATHDIR "/" SECKEY;

1758

1920

const char *pubkey = PATHDIR "/" PUBKEY;

1759

1921

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1761

1922

1762

1923

bool gnutls_initialized = false;

1763

1924

bool gpgme_initialized = false;

1854

2015

connect_to = arg;

1855

2016

break;

1856

2017

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

1857

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

1858

(int)',');

2018

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

2019

arg, (int)',');

1859

2020

if(ret_errno != 0){

1860

2021

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

1861

2022

}

1941

2102

/* Work around Debian bug #633582:

1942

2103

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

1943

2104

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2105

/* Re-raise privileges */

2106

ret_errno = raise_privileges();

2107

if(ret_errno != 0){

2108

errno = ret_errno;

2109

perror_plus("Failed to raise privileges");

2110

} else {

1946

2111

struct stat st;

1947

2112

1948

2113

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

1988

2153

}

1989

2154

1990

2155

/* Lower privileges */

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2156

ret_errno = lower_privileges();

2157

if(ret_errno != 0){

2158

errno = ret_errno;

2159

perror_plus("Failed to lower privileges");

1995

2160

}

1996

2161

}

1997

2162

}

1998

2163

1999

/* Remove empty interface names */

2164

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

2000

2165

{

2001

2166

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2167

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

2003

2168

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

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

2169

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

2170

and if_nametoindex(interface) == 0){

2171

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

2006

2172

fprintf_plus(stderr, "Not using nonexisting interface"

2007

2173

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

2008

2174

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2175

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

2010

2176

interface = NULL;

2011

2177

}

2012

2178

}

2014

2180

2015

2181

/* Run network hooks */

2016

2182

{

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

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

2026

goto end;

2027

}

2183

if(mc.interfaces != NULL){

2184

interfaces_hooks = malloc(mc.interfaces_size);

2185

if(interfaces_hooks == NULL){

2186

perror_plus("malloc");

2187

goto end;

2188

}

2189

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

2190

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

2191

}

2192

run_network_hooks("start", interfaces_hooks != NULL ?

2193

interfaces_hooks : "", delay);

2028

2194

}

2029

2195

2030

2196

if(not debug){

2035

2201

from the signal handler */

2036

2202

/* Initialize the pseudo-RNG for Avahi */

2037

2203

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

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2204

simple_poll = avahi_simple_poll_new();

2205

if(simple_poll == NULL){

2040

2206

fprintf_plus(stderr,

2041

2207

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

2042

2208

exitcode = EX_UNAVAILABLE;

2107

2273

}

2108

2274

2109

2275

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

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2276

if(mc.interfaces == NULL){

2277

struct dirent **direntries = NULL;

2112

2278

/* Look for any good interfaces */

2113

2279

ret = scandir(sys_class_net, &direntries, good_interface,

2114

2280

alphasort);

2115

2281

if(ret >= 1){

2116

2282

/* Add all found interfaces to interfaces list */

2117

2283

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2284

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

2119

2285

direntries[i]->d_name);

2120

2286

if(ret_errno != 0){

2287

errno = ret_errno;

2121

2288

perror_plus("argz_add");

2289

free(direntries[i]);

2122

2290

continue;

2123

2291

}

2124

2292

if(debug){

2125

2293

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

2126

2294

direntries[i]->d_name);

2127

2295

}

2296

free(direntries[i]);

2128

2297

}

2129

2298

free(direntries);

2130

2299

} else {

2131

free(direntries);

2300

if(ret == 0){

2301

free(direntries);

2302

}

2132

2303

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

2133

2304

exitcode = EXIT_FAILURE;

2134

2305

goto end;

2135

2306

}

2136

2307

}

2137

2308

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

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

2149

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

2309

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

2310

{

2150

2311

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2312

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

2152

2313

interface))){

2314

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

2315

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

2316

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

2317

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

2318

interface);

2319

interface = NULL;

2320

while((interface = argz_next(mc.interfaces,

2321

mc.interfaces_size, interface))){

2322

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

2323

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

2324

interface);

2325

interface = NULL;

2326

}

2327

}

2328

break;

2329

}

2153

2330

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2331

errno = bring_up_interface(interface, delay);

2155

2332

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2333

if(errno != 0){

2158

2334

perror_plus("Failed to bring up interface");

2159

2335

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2336

errno = argz_add(&interfaces_to_take_down,

2337

&interfaces_to_take_down_size,

2338

interface);

2339

if(errno != 0){

2340

perror_plus("argz_add");

2341

}

2163

2342

}

2164

2343

}

2165

2344

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

2345

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

2170

2346

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

2171

2347

}

2172

2348

}

2173

2349

2350

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

2351

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

2352

if(debug){

2353

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

2354

mc.interfaces);

2355

}

2356

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

2357

}

2358

2174

2359

if(quit_now){

2175

2360

goto end;

2176

2361

}

2177

2362

2178

ret = init_gnutls_global(pubkey, seckey);

2363

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

2179

2364

if(ret == -1){

2180

2365

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

2181

2366

exitcode = EX_UNAVAILABLE;

2188

2373

goto end;

2189

2374

}

2190

2375

2191

if(mkdtemp(tempdir) == NULL){

2376

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

2377

tempdir = mkdtemp(run_tempdir);

2378

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

2379

if(debug){

2380

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

2381

run_tempdir, old_tempdir);

2382

}

2383

tempdir = mkdtemp(old_tempdir);

2384

}

2385

if(tempdir == NULL){

2192

2386

perror_plus("mkdtemp");

2193

2387

goto end;

2194

2388

}

2195

tempdir_created = true;

2196

2389

2197

2390

if(quit_now){

2198

2391

goto end;

2199

2392

}

2200

2393

2201

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

2394

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

2202

2395

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

2203

2396

exitcode = EX_UNAVAILABLE;

2204

2397

goto end;

2225

2418

goto end;

2226

2419

}

2227

2420

2228

uint16_t port;

2421

in_port_t port;

2229

2422

errno = 0;

2230

2423

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

2231

2424

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

2232

or tmpmax != (uint16_t)tmpmax){

2425

or tmpmax != (in_port_t)tmpmax){

2233

2426

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

2234

2427

exitcode = EX_USAGE;

2235

2428

goto end;

2236

2429

}

2237

2430

2238

2431

if(quit_now){

2239

2432

goto end;

2240

2433

}

2241

2434

2242

port = (uint16_t)tmpmax;

2435

port = (in_port_t)tmpmax;

2243

2436

*address = '\0';

2244

2437

/* Colon in address indicates IPv6 */

2245

2438

int af;

2261

2454

}

2262

2455

2263

2456

while(not quit_now){

2264

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

2457

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

2458

&mc);

2265

2459

if(quit_now or ret == 0){

2266

2460

break;

2267

2461

}

2269

2463

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

2270

2464

(int)retry_interval);

2271

2465

}

2272

sleep((int)retry_interval);

2466

sleep((unsigned int)retry_interval);

2273

2467

}

2274

2468

2275

if (not quit_now){

2469

if(not quit_now){

2276

2470

exitcode = EXIT_SUCCESS;

2277

2471

}

2278

2472

2293

2487

config.publish_domain = 0;

2294

2488

2295

2489

/* Allocate a new server */

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2490

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2491

&config, NULL, NULL, &ret_errno);

2299

2492

2300

2493

/* Free the Avahi configuration data */

2301

2494

avahi_server_config_free(&config);

2316

2509

/* Create the Avahi service browser */

2317

2510

sb = avahi_s_service_browser_new(mc.server, if_index,

2318

2511

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2319

NULL, 0, browse_callback, NULL);

2512

NULL, 0, browse_callback,

2513

(void *)&mc);

2320

2514

if(sb == NULL){

2321

2515

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

2322

2516

avahi_strerror(avahi_server_errno(mc.server)));

2333

2527

if(debug){

2334

2528

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

2335

2529

}

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2530

2531

ret = avahi_loop_with_timeout(simple_poll,

2532

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

2339

2533

if(debug){

2340

2534

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

2341

2535

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

2348

2542

}

2349

2543

2350

2544

/* Cleanup things */

2545

free(mc.interfaces);

2546

2351

2547

if(sb != NULL)

2352

2548

avahi_s_service_browser_free(sb);

2353

2549

2354

2550

if(mc.server != NULL)

2355

2551

avahi_server_free(mc.server);

2356

2552

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2553

if(simple_poll != NULL)

2554

avahi_simple_poll_free(simple_poll);

2359

2555

2360

2556

if(gnutls_initialized){

2361

2557

gnutls_certificate_free_credentials(mc.cred);

2373

2569

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

2374

2570

while(mc.current_server != NULL){

2375

2571

server *next = mc.current_server->next;

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic push

2574

#pragma GCC diagnostic ignored "-Wcast-qual"

2575

#endif

2576

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

2577

#ifdef __GNUC__

2578

#pragma GCC diagnostic pop

2579

#endif

2376

2580

free(mc.current_server);

2377

2581

mc.current_server = next;

2378

2582

}

2379

2583

}

2380

2584

2381

/* Re-raise priviliges */

2585

/* Re-raise privileges */

2382

2586

{

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

2398

}

2399

}

2400

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

2401

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

2402

" down\n");

2403

}

2404

}

2405

2406

lower_privileges_permanently();

2587

ret_errno = raise_privileges();

2588

if(ret_errno != 0){

2589

errno = ret_errno;

2590

perror_plus("Failed to raise privileges");

2591

} else {

2592

2593

/* Run network hooks */

2594

run_network_hooks("stop", interfaces_hooks != NULL ?

2595

interfaces_hooks : "", delay);

2596

2597

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

2598

{

2599

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to take down interface");

2607

}

2608

}

2609

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

2610

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

2611

" down\n");

2612

}

2613

}

2614

}

2615

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

errno = ret_errno;

2619

perror_plus("Failed to lower privileges permanently");

2620

}

2407

2621

}

2408

2622

2409

2623

free(interfaces_to_take_down);

2410

2624

free(interfaces_hooks);

2411

2625

2412

2626

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

2413

if(tempdir_created){

2627

if(tempdir != NULL){

2414

2628

struct dirent **direntries = NULL;

2415

struct dirent *direntry = NULL;

2416

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

2417

alphasort);

2418

if (numentries > 0){

2419

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

2420

direntry = direntries[i];

2421

char *fullname = NULL;

2422

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

2423

direntry->d_name);

2424

if(ret < 0){

2425

perror_plus("asprintf");

2426

continue;

2427

}

2428

ret = remove(fullname);

2429

if(ret == -1){

2430

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

2431

strerror(errno));

2432

}

2433

free(fullname);

2629

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

2630

O_NOFOLLOW));

2631

if(tempdir_fd == -1){

2632

perror_plus("open");

2633

} else {

2634

#ifdef __GLIBC__

2635

#if __GLIBC_PREREQ(2, 15)

2636

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

2637

notdotentries, alphasort);

2638

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

2639

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

2640

alphasort);

2641

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

2642

#else /* not __GLIBC__ */

2643

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

2644

alphasort);

2645

#endif /* not __GLIBC__ */

2646

if(numentries >= 0){

2647

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

2648

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

2649

if(ret == -1){

2650

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

2651

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

2652

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

2653

}

2654

free(direntries[i]);

2655

}

2656

2657

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

2658

free(direntries);

2659

if(numentries == -1){

2660

perror_plus("scandir");

2661

}

2662

ret = rmdir(tempdir);

2663

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

2664

perror_plus("rmdir");

2665

}

2434

2666

}

2435

}

2436

2437

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

2438

free(direntries);

2439

if (numentries == -1){

2440

perror_plus("scandir");

2441

}

2442

ret = rmdir(tempdir);

2443

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

2444

perror_plus("rmdir");

2667

TEMP_FAILURE_RETRY(close(tempdir_fd));

2445

2668

}

2446

2669

}

2447

2670