/mandos/trunk : revision 594.1.1

9

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

10

*

11

* Everything else is

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13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

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(),

47

strtof(), abort() */

48

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

49

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

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asprintf(), strncpy() */

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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(), AT_REMOVEDIR */

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inet_pton(), connect() */

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

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

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61

*/

63

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

64

63

strtoimax() */

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

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EAI_SYSTEM, ENETUNREACH,

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EHOSTUNREACH, ECONNREFUSED, EPROTO,

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EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

64

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

65

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

70

66

program_invocation_short_name */

71

67

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

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68

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

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73

*/

78

74

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

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

80

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

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unlinkat() */

82

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

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

77

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

83

78

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

84

79

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

85

80

argp_state, struct argp,

93

88

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

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89

WEXITSTATUS(), WTERMSIG() */

95

90

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

96

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

97

argz_delete(), argz_append(),

98

argz_stringify(), argz_add(),

99

argz_count() */

100

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

101

EAI_SYSTEM, gai_strerror() */

102

91

103

92

#ifdef __linux__

104

93

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

146

135

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

147

136

char *connect_to = NULL;

148

137

const char *hookdir = HOOKDIR;

149

int hookdir_fd = -1;

150

138

uid_t uid = 65534;

151

139

gid_t gid = 65534;

152

140

153

141

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

154

142

typedef struct server{

155

143

const char *ip;

156

in_port_t port;

144

uint16_t port;

157

145

AvahiIfIndex if_index;

158

146

int af;

159

147

struct timespec last_seen;

163

151

164

152

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

165

153

typedef struct {

154

AvahiSimplePoll *simple_poll;

166

155

AvahiServer *server;

167

156

gnutls_certificate_credentials_t cred;

168

157

unsigned int dh_bits;

170

159

const char *priority;

171

160

gpgme_ctx_t ctx;

172

161

server *current_server;

173

char *interfaces;

174

size_t interfaces_size;

175

162

} mandos_context;

176

163

177

/* global so signal handler can reach it*/

178

AvahiSimplePoll *simple_poll;

164

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

165

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

166

.dh_bits = 1024, .priority = "SECURE256"

167

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

168

.current_server = NULL };

179

169

180

170

sig_atomic_t quit_now = 0;

181

171

int signal_received = 0;

189

179

perror(print_text);

190

180

}

191

181

192

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

182

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

193

183

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

194

184

va_list ap;

195

185

va_start (ap, format);

196

186

197

187

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

198

188

program_invocation_short_name));

199

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

189

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

200

190

}

201

191

202

192

/*

204

194

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

205

195

* "buffer_length" is how much is already used.

206

196

*/

207

__attribute__((nonnull, warn_unused_result))

208

197

size_t incbuffer(char **buffer, size_t buffer_length,

209

198

size_t buffer_capacity){

210

199

if(buffer_length + BUFFER_SIZE > buffer_capacity){

211

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

212

if(new_buf == NULL){

213

int old_errno = errno;

214

free(*buffer);

215

errno = old_errno;

216

*buffer = NULL;

200

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

201

if(buffer == NULL){

217

202

return 0;

218

203

}

219

*buffer = new_buf;

220

204

buffer_capacity += BUFFER_SIZE;

221

205

}

222

206

return buffer_capacity;

223

207

}

224

208

225

209

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

226

__attribute__((nonnull, warn_unused_result))

227

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

228

int af, server **current_server){

210

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

211

int af){

229

212

int ret;

230

213

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

231

214

if(new_server == NULL){

238

221

.af = af };

239

222

if(new_server->ip == NULL){

240

223

perror_plus("strdup");

241

free(new_server);

242

return false;

243

}

244

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

245

if(ret == -1){

246

perror_plus("clock_gettime");

247

#ifdef __GNUC__

248

#pragma GCC diagnostic push

249

#pragma GCC diagnostic ignored "-Wcast-qual"

250

#endif

251

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

252

#ifdef __GNUC__

253

#pragma GCC diagnostic pop

254

#endif

255

free(new_server);

256

224

return false;

257

225

}

258

226

/* Special case of first server */

259

if(*current_server == NULL){

227

if (mc.current_server == NULL){

260

228

new_server->next = new_server;

261

229

new_server->prev = new_server;

262

*current_server = new_server;

230

mc.current_server = new_server;

231

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

263

232

} else {

264

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

265

new_server->next = *current_server;

266

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

233

new_server->next = mc.current_server;

234

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

267

235

new_server->prev->next = new_server;

268

(*current_server)->prev = new_server;

236

mc.current_server->prev = new_server;

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

269

242

}

270

243

return true;

271

244

}

273

246

/*

274

247

* Initialize GPGME.

275

248

*/

276

__attribute__((nonnull, warn_unused_result))

277

static bool init_gpgme(const char * const seckey,

278

const char * const pubkey,

279

const char * const tempdir,

280

mandos_context *mc){

249

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

250

const char *tempdir){

281

251

gpgme_error_t rc;

282

252

gpgme_engine_info_t engine_info;

283

253

254

284

255

/*

285

256

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

286

257

*/

287

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

288

259

int ret;

289

260

int fd;

290

261

gpgme_data_t pgp_data;

302

273

return false;

303

274

}

304

275

305

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

276

rc = gpgme_op_import(mc.ctx, pgp_data);

306

277

if(rc != GPG_ERR_NO_ERROR){

307

278

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

308

279

gpgme_strsource(rc), gpgme_strerror(rc));

309

280

return false;

310

281

}

311

282

312

ret = close(fd);

283

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

313

284

if(ret == -1){

314

285

perror_plus("close");

315

286

}

352

323

}

353

324

354

325

/* Create new GPGME "context" */

355

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

326

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

356

327

if(rc != GPG_ERR_NO_ERROR){

357

328

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

358

329

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

371

342

* Decrypt OpenPGP data.

372

343

* Returns -1 on error

373

344

*/

374

__attribute__((nonnull, warn_unused_result))

375

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

376

346

size_t crypto_size,

377

char **plaintext,

378

mandos_context *mc){

347

char **plaintext){

379

348

gpgme_data_t dh_crypto, dh_plain;

380

349

gpgme_error_t rc;

381

350

ssize_t ret;

407

376

408

377

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

409

378

data buffer */

410

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

379

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

411

380

if(rc != GPG_ERR_NO_ERROR){

412

381

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

413

382

gpgme_strsource(rc), gpgme_strerror(rc));

414

383

plaintext_length = -1;

415

384

if(debug){

416

385

gpgme_decrypt_result_t result;

417

result = gpgme_op_decrypt_result(mc->ctx);

386

result = gpgme_op_decrypt_result(mc.ctx);

418

387

if(result == NULL){

419

388

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

420

389

} else {

497

466

return plaintext_length;

498

467

}

499

468

500

__attribute__((warn_unused_result, const))

501

static const char *safe_string(const char *str){

502

if(str == NULL)

503

return "(unknown)";

504

return str;

505

}

506

507

__attribute__((warn_unused_result))

508

static const char *safer_gnutls_strerror(int value){

509

const char *ret = gnutls_strerror(value);

510

return safe_string(ret);

469

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

511

475

}

512

476

513

477

/* GnuTLS log function callback */

514

__attribute__((nonnull))

515

478

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

516

479

const char* string){

517

480

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

518

481

}

519

482

520

__attribute__((nonnull(1, 2, 4), warn_unused_result))

521

483

static int init_gnutls_global(const char *pubkeyfilename,

522

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

mandos_context *mc){

484

const char *seckeyfilename){

525

485

int ret;

526

unsigned int uret;

527

486

528

487

if(debug){

529

488

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

530

489

}

531

490

491

ret = gnutls_global_init();

492

if(ret != GNUTLS_E_SUCCESS){

493

fprintf_plus(stderr, "GnuTLS global_init: %s\n",

494

safer_gnutls_strerror(ret));

495

return -1;

496

}

497

532

498

if(debug){

533

499

/* "Use a log level over 10 to enable all debugging options."

534

500

* - GnuTLS manual

538

504

}

539

505

540

506

/* OpenPGP credentials */

541

ret = gnutls_certificate_allocate_credentials(&mc->cred);

507

ret = gnutls_certificate_allocate_credentials(&mc.cred);

542

508

if(ret != GNUTLS_E_SUCCESS){

543

509

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

544

510

safer_gnutls_strerror(ret));

511

gnutls_global_deinit();

545

512

return -1;

546

513

}

547

514

553

520

}

554

521

555

522

ret = gnutls_certificate_set_openpgp_key_file

556

(mc->cred, pubkeyfilename, seckeyfilename,

523

(mc.cred, pubkeyfilename, seckeyfilename,

557

524

GNUTLS_OPENPGP_FMT_BASE64);

558

525

if(ret != GNUTLS_E_SUCCESS){

559

526

fprintf_plus(stderr,

565

532

}

566

533

567

534

/* GnuTLS server initialization */

568

ret = gnutls_dh_params_init(&mc->dh_params);

535

ret = gnutls_dh_params_init(&mc.dh_params);

569

536

if(ret != GNUTLS_E_SUCCESS){

570

537

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

571

538

" initialization: %s\n",

572

539

safer_gnutls_strerror(ret));

573

540

goto globalfail;

574

541

}

575

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

576

if(dhparamsfilename != NULL){

577

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

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

586

while(true){

587

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

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

591

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

595

break;

596

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

599

BUFFER_SIZE);

600

/* EOF */

601

if(bytes_read == 0){

602

break;

603

}

604

/* check bytes_read for failure */

605

if(bytes_read < 0){

606

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

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

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

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

624

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

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

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

633

/* Try to read the private key file */

634

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

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

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

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

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

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

676

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

679

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

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

685

if(ret != GNUTLS_E_SUCCESS){

686

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

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

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

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

704

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

714

}

715

}

716

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

720

if(debug){

721

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

722

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

723

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

726

}

727

} else {

728

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

729

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

730

safe_string(gnutls_sec_param_get_name

731

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

734

}

735

} else if(debug){

736

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

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

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

742

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

743

safer_gnutls_strerror(ret));

744

goto globalfail;

745

}

746

}

747

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

542

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

543

if(ret != GNUTLS_E_SUCCESS){

544

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

545

safer_gnutls_strerror(ret));

546

goto globalfail;

547

}

548

549

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

748

550

749

551

return 0;

750

552

751

553

globalfail:

752

554

753

gnutls_certificate_free_credentials(mc->cred);

754

gnutls_dh_params_deinit(mc->dh_params);

555

gnutls_certificate_free_credentials(mc.cred);

556

gnutls_global_deinit();

557

gnutls_dh_params_deinit(mc.dh_params);

755

558

return -1;

756

559

}

757

560

758

__attribute__((nonnull, warn_unused_result))

759

static int init_gnutls_session(gnutls_session_t *session,

760

mandos_context *mc){

561

static int init_gnutls_session(gnutls_session_t *session){

761

562

int ret;

762

563

/* GnuTLS session creation */

763

564

do {

775

576

{

776

577

const char *err;

777

578

do {

778

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

579

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

779

580

if(quit_now){

780

581

gnutls_deinit(*session);

781

582

return -1;

792

593

793

594

do {

794

595

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

795

mc->cred);

596

mc.cred);

796

597

if(quit_now){

797

598

gnutls_deinit(*session);

798

599

return -1;

808

609

/* ignore client certificate if any. */

809

610

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

611

612

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

613

811

614

return 0;

812

615

}

813

616

815

618

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

816

619

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

817

620

818

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

819

__attribute__((warn_unused_result))

820

int raise_privileges(void){

821

int old_errno = errno;

822

int ret = 0;

823

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

824

ret = errno;

825

}

826

errno = old_errno;

827

return ret;

828

}

829

830

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

831

__attribute__((warn_unused_result))

832

int raise_privileges_permanently(void){

833

int old_errno = errno;

834

int ret = raise_privileges();

835

if(ret != 0){

836

errno = old_errno;

837

return ret;

838

}

839

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

840

ret = errno;

841

}

842

errno = old_errno;

843

return ret;

844

}

845

846

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

847

__attribute__((warn_unused_result))

848

int lower_privileges(void){

849

int old_errno = errno;

850

int ret = 0;

851

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

852

ret = errno;

853

}

854

errno = old_errno;

855

return ret;

856

}

857

858

/* Lower privileges permanently */

859

__attribute__((warn_unused_result))

860

int lower_privileges_permanently(void){

861

int old_errno = errno;

862

int ret = 0;

863

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

864

ret = errno;

865

}

866

errno = old_errno;

867

return ret;

868

}

869

870

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

871

__attribute__((nonnull, warn_unused_result))

872

static bool add_delete_local_route(const bool add,

873

const char *address,

874

AvahiIfIndex if_index){

875

int ret;

876

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

877

char add_arg[] = "add";

878

char delete_arg[] = "delete";

879

char debug_flag[] = "--debug";

880

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

881

if(pluginhelperdir == NULL){

882

if(debug){

883

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

884

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

885

}

886

return false;

887

}

888

889

char interface[IF_NAMESIZE];

890

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

891

perror_plus("if_indextoname");

892

return false;

893

}

894

895

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

896

if(devnull == -1){

897

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

898

return false;

899

}

900

pid_t pid = fork();

901

if(pid == 0){

902

/* Child */

903

/* Raise privileges */

904

errno = raise_privileges_permanently();

905

if(errno != 0){

906

perror_plus("Failed to raise privileges");

907

/* _exit(EX_NOPERM); */

908

} else {

909

/* Set group */

910

errno = 0;

911

ret = setgid(0);

912

if(ret == -1){

913

perror_plus("setgid");

914

_exit(EX_NOPERM);

915

}

916

/* Reset supplementary groups */

917

errno = 0;

918

ret = setgroups(0, NULL);

919

if(ret == -1){

920

perror_plus("setgroups");

921

_exit(EX_NOPERM);

922

}

923

}

924

ret = dup2(devnull, STDIN_FILENO);

925

if(ret == -1){

926

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

927

_exit(EX_OSERR);

928

}

929

ret = close(devnull);

930

if(ret == -1){

931

perror_plus("close");

932

_exit(EX_OSERR);

933

}

934

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

935

if(ret == -1){

936

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

937

_exit(EX_OSERR);

938

}

939

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

940

O_RDONLY

941

| O_DIRECTORY

942

| O_PATH

943

| O_CLOEXEC));

944

if(helperdir_fd == -1){

945

perror_plus("open");

946

_exit(EX_UNAVAILABLE);

947

}

948

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

949

helper, O_RDONLY));

950

if(helper_fd == -1){

951

perror_plus("openat");

952

close(helperdir_fd);

953

_exit(EX_UNAVAILABLE);

954

}

955

close(helperdir_fd);

956

#ifdef __GNUC__

957

#pragma GCC diagnostic push

958

#pragma GCC diagnostic ignored "-Wcast-qual"

959

#endif

960

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

961

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

962

interface, debug ? debug_flag : NULL, NULL },

963

environ) == -1){

964

#ifdef __GNUC__

965

#pragma GCC diagnostic pop

966

#endif

967

perror_plus("fexecve");

968

_exit(EXIT_FAILURE);

969

}

970

}

971

if(pid == -1){

972

perror_plus("fork");

973

return false;

974

}

975

int status;

976

pid_t pret = -1;

977

errno = 0;

978

do {

979

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

980

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

981

int errno_raising = 0;

982

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

983

errno_raising = errno;

984

perror_plus("Failed to raise privileges in order to"

985

" kill helper program");

986

}

987

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

988

perror_plus("kill");

989

}

990

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

991

perror_plus("Failed to lower privileges after killing"

992

" helper program");

993

}

994

return false;

995

}

996

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

997

if(pret == -1){

998

perror_plus("waitpid");

999

return false;

1000

}

1001

if(WIFEXITED(status)){

1002

if(WEXITSTATUS(status) != 0){

1003

fprintf_plus(stderr, "Error: iprouteadddel exited"

1004

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

1005

return false;

1006

}

1007

return true;

1008

}

1009

if(WIFSIGNALED(status)){

1010

fprintf_plus(stderr, "Error: iprouteadddel died by"

1011

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

1012

return false;

1013

}

1014

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

1015

return false;

1016

}

1017

1018

__attribute__((nonnull, warn_unused_result))

1019

static bool add_local_route(const char *address,

1020

AvahiIfIndex if_index){

1021

if(debug){

1022

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

1023

}

1024

return add_delete_local_route(true, address, if_index);

1025

}

1026

1027

__attribute__((nonnull, warn_unused_result))

1028

static bool delete_local_route(const char *address,

1029

AvahiIfIndex if_index){

1030

if(debug){

1031

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

1032

}

1033

return add_delete_local_route(false, address, if_index);

1034

}

1035

1036

621

/* Called when a Mandos server is found */

1037

__attribute__((nonnull, warn_unused_result))

1038

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

622

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

1039

623

AvahiIfIndex if_index,

1040

int af, mandos_context *mc){

624

int af){

1041

625

int ret, tcp_sd = -1;

1042

626

ssize_t sret;

1043

struct sockaddr_storage to;

627

union {

628

struct sockaddr_in in;

629

struct sockaddr_in6 in6;

630

} to;

1044

631

char *buffer = NULL;

1045

632

char *decrypted_buffer = NULL;

1046

633

size_t buffer_length = 0;

1049

636

int retval = -1;

1050

637

gnutls_session_t session;

1051

638

int pf; /* Protocol family */

1052

bool route_added = false;

1053

639

1054

640

errno = 0;

1055

641

1071

657

return -1;

1072

658

}

1073

659

1074

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

1075

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

1076

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

1077

bool match = false;

1078

{

1079

char *interface = NULL;

1080

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

1081

interface))){

1082

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

1083

match = true;

1084

break;

1085

}

1086

}

1087

}

1088

if(not match){

1089

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

1090

connect to the server */

1091

if(debug){

1092

char interface[IF_NAMESIZE];

1093

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

1094

perror_plus("if_indextoname");

1095

} else {

1096

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

1097

" \"%s\"\n",

1098

if_indextoname((unsigned int)if_index,

1099

interface));

1100

}

1101

}

1102

return -1;

1103

}

1104

}

1105

1106

ret = init_gnutls_session(&session, mc);

660

ret = init_gnutls_session(&session);

1107

661

if(ret != 0){

1108

662

return -1;

1109

663

}

1110

664

1111

665

if(debug){

1112

666

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

1113

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

667

PRIu16 "\n", ip, port);

1114

668

}

1115

669

1116

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

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

1117

671

if(tcp_sd < 0){

1118

672

int e = errno;

1119

673

perror_plus("socket");

1126

680

goto mandos_end;

1127

681

}

1128

682

683

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

1129

684

if(af == AF_INET6){

1130

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

1131

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

1132

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

685

to.in6.sin6_family = (sa_family_t)af;

686

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

1133

687

} else { /* IPv4 */

1134

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

1135

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

1136

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

688

to.in.sin_family = (sa_family_t)af;

689

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

1137

690

}

1138

691

if(ret < 0 ){

1139

692

int e = errno;

1148

701

goto mandos_end;

1149

702

}

1150

703

if(af == AF_INET6){

1151

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

1152

if(IN6_IS_ADDR_LINKLOCAL

1153

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

704

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

705

-Wconversion and

706

-Wunreachable-code */

707

708

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

709

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

710

-Wunreachable-code*/

1154

711

if(if_index == AVAHI_IF_UNSPEC){

1155

712

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

1156

713

" incomplete without a network interface\n");

1158

715

goto mandos_end;

1159

716

}

1160

717

/* Set the network interface number as scope */

1161

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

718

to.in6.sin6_scope_id = (uint32_t)if_index;

1162

719

}

1163

720

} else {

1164

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

721

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

722

-Wconversion and

723

-Wunreachable-code */

1165

724

}

1166

725

1167

726

if(quit_now){

1175

734

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

1176

735

perror_plus("if_indextoname");

1177

736

} else {

1178

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

1179

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

737

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

738

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

1180

739

}

1181

740

} else {

1182

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

1183

ip, (uintmax_t)port);

741

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

742

ip, port);

1184

743

}

1185

744

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1186

745

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1187

if(af == AF_INET6){

1188

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

1189

sizeof(struct sockaddr_in6),

1190

addrstr, sizeof(addrstr), NULL, 0,

1191

NI_NUMERICHOST);

1192

} else {

1193

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

1194

sizeof(struct sockaddr_in),

1195

addrstr, sizeof(addrstr), NULL, 0,

1196

NI_NUMERICHOST);

1197

}

1198

if(ret == EAI_SYSTEM){

1199

perror_plus("getnameinfo");

1200

} else if(ret != 0) {

1201

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

1202

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

1203

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

1204

}

1205

}

1206

1207

if(quit_now){

1208

errno = EINTR;

1209

goto mandos_end;

1210

}

1211

1212

while(true){

1213

if(af == AF_INET6){

1214

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

1215

sizeof(struct sockaddr_in6));

1216

} else {

1217

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

1218

sizeof(struct sockaddr_in));

1219

}

1220

if(ret < 0){

1221

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1222

and if_index != AVAHI_IF_UNSPEC

1223

and connect_to == NULL

1224

and not route_added and

1225

((af == AF_INET6 and not

1226

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1227

&to)->sin6_addr)))

1228

or (af == AF_INET and

1229

/* Not a a IPv4LL address */

1230

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

1231

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

1232

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

1233

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

1234

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

1235

connect to a Mandos server announced by Avahi on a server

1236

host with a global address. Work around this by retrying

1237

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

1238

1239

Avahi bug reference:

1240

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

1241

https://bugs.debian.org/587961

1242

*/

1243

if(debug){

1244

fprintf_plus(stderr, "Mandos server unreachable, trying"

1245

" direct route\n");

1246

}

1247

int e = errno;

1248

route_added = add_local_route(ip, if_index);

1249

if(route_added){

1250

continue;

1251

}

1252

errno = e;

1253

}

1254

if(errno != ECONNREFUSED or debug){

1255

int e = errno;

1256

perror_plus("connect");

1257

errno = e;

1258

}

1259

goto mandos_end;

1260

}

1261

1262

if(quit_now){

1263

errno = EINTR;

1264

goto mandos_end;

1265

}

1266

break;

746

const char *pcret;

747

if(af == AF_INET6){

748

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

749

sizeof(addrstr));

750

} else {

751

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

752

sizeof(addrstr));

753

}

754

if(pcret == NULL){

755

perror_plus("inet_ntop");

756

} else {

757

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

758

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

759

}

760

}

761

}

762

763

if(quit_now){

764

errno = EINTR;

765

goto mandos_end;

766

}

767

768

if(af == AF_INET6){

769

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

770

} else {

771

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

772

}

773

if(ret < 0){

774

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

775

int e = errno;

776

perror_plus("connect");

777

errno = e;

778

}

779

goto mandos_end;

780

}

781

782

if(quit_now){

783

errno = EINTR;

784

goto mandos_end;

1267

785

}

1268

786

1269

787

const char *out = mandos_protocol_version;

1420

938

if(buffer_length > 0){

1421

939

ssize_t decrypted_buffer_size;

1422

940

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1423

&decrypted_buffer, mc);

941

&decrypted_buffer);

1424

942

if(decrypted_buffer_size >= 0){

1425

943

1426

944

written = 0;

1452

970

1453

971

mandos_end:

1454

972

{

1455

if(route_added){

1456

if(not delete_local_route(ip, if_index)){

1457

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

1458

" interface %d", ip, if_index);

1459

}

1460

}

1461

973

int e = errno;

1462

974

free(decrypted_buffer);

1463

975

free(buffer);

1464

976

if(tcp_sd >= 0){

1465

ret = close(tcp_sd);

977

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

1466

978

}

1467

979

if(ret == -1){

1468

980

if(e == 0){

1480

992

return retval;

1481

993

}

1482

994

1483

__attribute__((nonnull))

1484

995

static void resolve_callback(AvahiSServiceResolver *r,

1485

996

AvahiIfIndex interface,

1486

997

AvahiProtocol proto,

1494

1005

AVAHI_GCC_UNUSED AvahiStringList *txt,

1495

1006

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1496

1007

flags,

1497

void *mc){

1498

if(r == NULL){

1499

return;

1500

}

1008

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1501

1010

1502

1011

/* Called whenever a service has been resolved successfully or

1503

1012

timed out */

1504

1013

1505

1014

if(quit_now){

1506

avahi_s_service_resolver_free(r);

1507

1015

return;

1508

1016

}

1509

1017

1513

1021

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

1514

1022

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

1515

1023

domain,

1516

avahi_strerror(avahi_server_errno

1517

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

1024

avahi_strerror(avahi_server_errno(mc.server)));

1518

1025

break;

1519

1026

1520

1027

case AVAHI_RESOLVER_FOUND:

1526

1033

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

1527

1034

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

1528

1035

}

1529

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

1530

interface,

1531

avahi_proto_to_af(proto),

1532

mc);

1036

int ret = start_mandos_communication(ip, port, interface,

1037

avahi_proto_to_af(proto));

1533

1038

if(ret == 0){

1534

avahi_simple_poll_quit(simple_poll);

1039

avahi_simple_poll_quit(mc.simple_poll);

1535

1040

} else {

1536

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

1537

avahi_proto_to_af(proto),

1538

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

1041

if(not add_server(ip, port, interface,

1042

avahi_proto_to_af(proto))){

1539

1043

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

1540

1044

" list\n", name);

1541

1045

}

1554

1058

const char *domain,

1555

1059

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1556

1060

flags,

1557

void *mc){

1558

if(b == NULL){

1559

return;

1560

}

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1561

1063

1562

1064

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

1563

1065

is removed from the LAN */

1571

1073

case AVAHI_BROWSER_FAILURE:

1572

1074

1573

1075

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

1574

avahi_strerror(avahi_server_errno

1575

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

1576

avahi_simple_poll_quit(simple_poll);

1076

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1577

1078

return;

1578

1079

1579

1080

case AVAHI_BROWSER_NEW:

1582

1083

the callback function is called the Avahi server will free the

1583

1084

resolver for us. */

1584

1085

1585

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

1586

interface, protocol, name, type,

1587

domain, protocol, 0,

1588

resolve_callback, mc) == NULL)

1086

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

1087

name, type, domain, protocol, 0,

1088

resolve_callback, NULL) == NULL)

1589

1089

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

1590

1090

" %s\n", name,

1591

avahi_strerror(avahi_server_errno

1592

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

1091

avahi_strerror(avahi_server_errno(mc.server)));

1593

1092

break;

1594

1093

1595

1094

case AVAHI_BROWSER_REMOVE:

1614

1113

signal_received = sig;

1615

1114

int old_errno = errno;

1616

1115

/* set main loop to exit */

1617

if(simple_poll != NULL){

1618

avahi_simple_poll_quit(simple_poll);

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1619

1118

}

1620

1119

errno = old_errno;

1621

1120

}

1622

1121

1623

__attribute__((nonnull, warn_unused_result))

1624

1122

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

1625

1123

int ret;

1626

int old_errno;

1627

1124

1628

1125

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

1629

1126

if(s < 0){

1630

old_errno = errno;

1631

1127

perror_plus("socket");

1632

errno = old_errno;

1633

1128

return false;

1634

1129

}

1635

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1636

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1130

strcpy(ifr->ifr_name, ifname);

1637

1131

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1638

1132

if(ret == -1){

1639

1133

if(debug){

1640

old_errno = errno;

1641

1134

perror_plus("ioctl SIOCGIFFLAGS");

1642

errno = old_errno;

1643

1135

}

1644

1136

return false;

1645

1137

}

1646

1138

return true;

1647

1139

}

1648

1140

1649

__attribute__((nonnull, warn_unused_result))

1650

1141

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

1651

1142

1652

1143

/* Reject the loopback device */

1694

1185

* corresponds to an acceptable network device.

1695

1186

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

1696

1187

*/

1697

__attribute__((nonnull, warn_unused_result))

1698

1188

int good_interface(const struct dirent *if_entry){

1699

1189

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

1700

1190

return 0;

1716

1206

}

1717

1207

1718

1208

/*

1719

* This function determines if a network interface is up.

1720

*/

1721

__attribute__((nonnull, warn_unused_result))

1722

bool interface_is_up(const char *interface){

1723

struct ifreq ifr;

1724

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

1725

if(debug){

1726

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

1727

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

1728

}

1729

return false;

1730

}

1731

1732

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

1733

}

1734

1735

/*

1736

* This function determines if a network interface is running

1737

*/

1738

__attribute__((nonnull, warn_unused_result))

1739

bool interface_is_running(const char *interface){

1740

struct ifreq ifr;

1741

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

1742

if(debug){

1743

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

1744

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

1745

}

1746

return false;

1747

}

1748

1749

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

1750

}

1751

1752

__attribute__((nonnull, pure, warn_unused_result))

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

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

1220

if(debug){

1221

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

1222

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

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

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

1229

if(debug){

1230

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

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

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

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

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

1246

return 0;

1247

}

1248

return 1;

1249

}

1250

1753

1251

int notdotentries(const struct dirent *direntry){

1754

1252

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

1755

1253

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

1762

1260

}

1763

1261

1764

1262

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

1765

__attribute__((nonnull, warn_unused_result))

1766

1263

int runnable_hook(const struct dirent *direntry){

1767

1264

int ret;

1768

1265

size_t sret;

1776

1273

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

1777

1274

"abcdefghijklmnopqrstuvwxyz"

1778

1275

"0123456789"

1779

"_.-");

1276

"_-");

1780

1277

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

1781

1278

/* Contains non-allowed characters */

1782

1279

if(debug){

1786

1283

return 0;

1787

1284

}

1788

1285

1789

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

1286

char *fullname = NULL;

1287

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

1288

if(ret < 0){

1289

perror_plus("asprintf");

1290

return 0;

1291

}

1292

1293

ret = stat(fullname, &st);

1790

1294

if(ret == -1){

1791

1295

if(debug){

1792

1296

perror_plus("Could not stat hook");

1816

1320

return 1;

1817

1321

}

1818

1322

1819

__attribute__((nonnull, warn_unused_result))

1820

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1821

mandos_context *mc){

1323

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1822

1324

int ret;

1823

1325

struct timespec now;

1824

1326

struct timespec waited_time;

1825

1327

intmax_t block_time;

1826

1328

1827

1329

while(true){

1828

if(mc->current_server == NULL){

1829

if(debug){

1330

if(mc.current_server == NULL){

1331

if (debug){

1830

1332

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

1831

1333

" No timeout!\n");

1832

1334

}

1833

1335

ret = avahi_simple_poll_iterate(s, -1);

1834

1336

} else {

1835

if(debug){

1337

if (debug){

1836

1338

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

1837

1339

" it, or wait\n");

1838

1340

}

1845

1347

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

1846

1348

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

1847

1349

waited_time.tv_sec = (now.tv_sec

1848

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

1350

- mc.current_server->last_seen.tv_sec);

1849

1351

waited_time.tv_nsec = (now.tv_nsec

1850

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

1352

- mc.current_server->last_seen.tv_nsec);

1851

1353

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

1852

1354

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

1853

1355

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

1855

1357

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

1856

1358

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

1857

1359

1858

if(debug){

1360

if (debug){

1859

1361

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

1860

1362

block_time);

1861

1363

}

1862

1364

1863

1365

if(block_time <= 0){

1864

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

1865

mc->current_server->port,

1866

mc->current_server->if_index,

1867

mc->current_server->af, mc);

1366

ret = start_mandos_communication(mc.current_server->ip,

1367

mc.current_server->port,

1368

mc.current_server->if_index,

1369

mc.current_server->af);

1868

1370

if(ret == 0){

1869

avahi_simple_poll_quit(s);

1371

avahi_simple_poll_quit(mc.simple_poll);

1870

1372

return 0;

1871

1373

}

1872

1374

ret = clock_gettime(CLOCK_MONOTONIC,

1873

&mc->current_server->last_seen);

1375

&mc.current_server->last_seen);

1874

1376

if(ret == -1){

1875

1377

perror_plus("clock_gettime");

1876

1378

return -1;

1877

1379

}

1878

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

1380

mc.current_server = mc.current_server->next;

1879

1381

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

1880

1382

servers, but don't block */

1881

1383

}

1883

1385

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

1884

1386

}

1885

1387

if(ret != 0){

1886

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

1388

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

1887

1389

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

1888

1390

}

1889

1391

}

1890

1392

}

1891

1393

}

1892

1394

1893

__attribute__((nonnull))

1894

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

1395

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

1396

int raise_privileges(void){

1397

int old_errno = errno;

1398

int ret_errno = 0;

1399

errno = 0;

1400

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

1401

perror_plus("seteuid");

1402

}

1403

ret_errno = errno;

1404

errno = old_errno;

1405

return ret_errno;

1406

}

1407

1408

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

1409

int raise_privileges_permanently(void){

1410

int old_errno = errno;

1411

int ret_errno = raise_privileges();

1412

if(ret_errno != 0){

1413

errno = old_errno;

1414

return ret_errno;

1415

}

1416

errno = 0;

1417

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

1418

perror_plus("seteuid");

1419

}

1420

ret_errno = errno;

1421

errno = old_errno;

1422

return ret_errno;

1423

}

1424

1425

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

1426

int lower_privileges(void){

1427

int old_errno = errno;

1428

int ret_errno = 0;

1429

errno = 0;

1430

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

1431

perror_plus("seteuid");

1432

}

1433

ret_errno = errno;

1434

errno = old_errno;

1435

return ret_errno;

1436

}

1437

1438

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

1895

1439

const float delay){

1896

struct dirent **direntries = NULL;

1897

if(hookdir_fd == -1){

1898

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1899

| O_CLOEXEC);

1900

if(hookdir_fd == -1){

1901

if(errno == ENOENT){

1902

if(debug){

1903

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

1904

" found\n", hookdir);

1905

}

1906

} else {

1907

perror_plus("open");

1908

}

1909

return;

1910

}

1911

}

1912

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

1913

runnable_hook, alphasort);

1440

struct dirent **direntries;

1441

struct dirent *direntry;

1442

int ret;

1443

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

1444

alphasort);

1914

1445

if(numhooks == -1){

1915

1446

perror_plus("scandir");

1916

return;

1917

}

1918

struct dirent *direntry;

1919

int ret;

1920

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

1921

if(devnull == -1){

1922

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

1923

return;

1924

}

1925

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

1926

direntry = direntries[i];

1927

if(debug){

1928

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

1929

direntry->d_name);

1930

}

1931

pid_t hook_pid = fork();

1932

if(hook_pid == 0){

1933

/* Child */

1934

/* Raise privileges */

1935

errno = raise_privileges_permanently();

1936

if(errno != 0){

1937

perror_plus("Failed to raise privileges");

1938

_exit(EX_NOPERM);

1939

}

1940

/* Set group */

1941

errno = 0;

1942

ret = setgid(0);

1943

if(ret == -1){

1944

perror_plus("setgid");

1945

_exit(EX_NOPERM);

1946

}

1947

/* Reset supplementary groups */

1948

errno = 0;

1949

ret = setgroups(0, NULL);

1950

if(ret == -1){

1951

perror_plus("setgroups");

1952

_exit(EX_NOPERM);

1953

}

1954

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

1955

if(ret == -1){

1956

perror_plus("setenv");

1957

_exit(EX_OSERR);

1958

}

1959

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

1960

if(ret == -1){

1961

perror_plus("setenv");

1962

_exit(EX_OSERR);

1963

}

1964

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

1965

if(ret == -1){

1966

perror_plus("setenv");

1967

_exit(EX_OSERR);

1968

}

1969

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

1970

if(ret == -1){

1971

perror_plus("setenv");

1972

_exit(EX_OSERR);

1973

}

1974

char *delaystring;

1975

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

1976

if(ret == -1){

1447

} else {

1448

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

1449

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

1450

direntry = direntries[i];

1451

char *fullname = NULL;

1452

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

1453

if(ret < 0){

1977

1454

perror_plus("asprintf");

1978

_exit(EX_OSERR);

1979

}

1980

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

1981

if(ret == -1){

1455

continue;

1456

}

1457

if(debug){

1458

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

1459

direntry->d_name);

1460

}

1461

pid_t hook_pid = fork();

1462

if(hook_pid == 0){

1463

/* Child */

1464

/* Raise privileges */

1465

raise_privileges_permanently();

1466

/* Set group */

1467

errno = 0;

1468

ret = setgid(0);

1469

if(ret == -1){

1470

perror_plus("setgid");

1471

}

1472

/* Reset supplementary groups */

1473

errno = 0;

1474

ret = setgroups(0, NULL);

1475

if(ret == -1){

1476

perror_plus("setgroups");

1477

}

1478

dup2(devnull, STDIN_FILENO);

1479

close(devnull);

1480

dup2(STDERR_FILENO, STDOUT_FILENO);

1481

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

1482

if(ret == -1){

1483

perror_plus("setenv");

1484

_exit(EX_OSERR);

1485

}

1486

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

1487

if(ret == -1){

1488

perror_plus("setenv");

1489

_exit(EX_OSERR);

1490

}

1491

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

1492

if(ret == -1){

1493

perror_plus("setenv");

1494

_exit(EX_OSERR);

1495

}

1496

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

1497

if(ret == -1){

1498

perror_plus("setenv");

1499

_exit(EX_OSERR);

1500

}

1501

char *delaystring;

1502

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

1503

if(ret == -1){

1504

perror_plus("asprintf");

1505

_exit(EX_OSERR);

1506

}

1507

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

1508

if(ret == -1){

1509

free(delaystring);

1510

perror_plus("setenv");

1511

_exit(EX_OSERR);

1512

}

1982

1513

free(delaystring);

1983

perror_plus("setenv");

1984

_exit(EX_OSERR);

1985

}

1986

free(delaystring);

1987

if(connect_to != NULL){

1988

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

1989

if(ret == -1){

1990

perror_plus("setenv");

1991

_exit(EX_OSERR);

1992

}

1993

}

1994

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

1995

direntry->d_name,

1996

O_RDONLY));

1997

if(hook_fd == -1){

1998

perror_plus("openat");

1999

_exit(EXIT_FAILURE);

2000

}

2001

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

2002

perror_plus("close");

2003

_exit(EXIT_FAILURE);

2004

}

2005

ret = dup2(devnull, STDIN_FILENO);

2006

if(ret == -1){

2007

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

2008

_exit(EX_OSERR);

2009

}

2010

ret = close(devnull);

2011

if(ret == -1){

2012

perror_plus("close");

2013

_exit(EX_OSERR);

2014

}

2015

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

2016

if(ret == -1){

2017

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

2018

_exit(EX_OSERR);

2019

}

2020

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

2021

environ) == -1){

2022

perror_plus("fexecve");

2023

_exit(EXIT_FAILURE);

2024

}

2025

} else {

2026

if(hook_pid == -1){

2027

perror_plus("fork");

2028

free(direntry);

2029

continue;

2030

}

2031

int status;

2032

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

2033

perror_plus("waitpid");

2034

free(direntry);

2035

continue;

2036

}

2037

if(WIFEXITED(status)){

2038

if(WEXITSTATUS(status) != 0){

2039

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

2040

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

2041

WEXITSTATUS(status));

2042

free(direntry);

2043

continue;

2044

}

2045

} else if(WIFSIGNALED(status)){

2046

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

2047

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

2048

WTERMSIG(status));

2049

free(direntry);

2050

continue;

1514

if(connect_to != NULL){

1515

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

1516

if(ret == -1){

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1520

}

1521

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

1522

perror_plus("execl");

1523

_exit(EXIT_FAILURE);

1524

}

2051

1525

} else {

2052

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

2053

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

2054

free(direntry);

2055

continue;

2056

}

2057

}

2058

if(debug){

2059

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

2060

direntry->d_name);

2061

}

2062

free(direntry);

2063

}

2064

free(direntries);

2065

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

2066

perror_plus("close");

2067

} else {

2068

hookdir_fd = -1;

2069

}

2070

close(devnull);

1526

int status;

1527

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

1528

perror_plus("waitpid");

1529

free(fullname);

1530

continue;

1531

}

1532

if(WIFEXITED(status)){

1533

if(WEXITSTATUS(status) != 0){

1534

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

1535

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

1536

WEXITSTATUS(status));

1537

free(fullname);

1538

continue;

1539

}

1540

} else if(WIFSIGNALED(status)){

1541

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

1542

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

1543

WTERMSIG(status));

1544

free(fullname);

1545

continue;

1546

} else {

1547

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

1548

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

1549

free(fullname);

1550

continue;

1551

}

1552

}

1553

free(fullname);

1554

if(debug){

1555

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

1556

direntry->d_name);

1557

}

1558

}

1559

close(devnull);

1560

}

1561

return true;

2071

1562

}

2072

1563

2073

__attribute__((nonnull, warn_unused_result))

2074

int bring_up_interface(const char *const interface,

2075

const float delay){

2076

int old_errno = errno;

1564

int bring_up_interface(const char * const interface, const float delay){

1565

int sd = -1;

2077

1566

int ret;

2078

1567

struct ifreq network;

2079

unsigned int if_index = if_nametoindex(interface);

1568

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

2080

1569

if(if_index == 0){

2081

1570

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

2082

errno = old_errno;

2083

return ENXIO;

1571

return EX_UNAVAILABLE;

2084

1572

}

2085

1573

2086

1574

if(quit_now){

2087

errno = old_errno;

2088

1575

return EINTR;

2089

1576

}

2090

1577

2091

if(not interface_is_up(interface)){

2092

int ret_errno = 0;

2093

int ioctl_errno = 0;

2094

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

2095

ret_errno = errno;

2096

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

2097

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

2098

errno = old_errno;

2099

return ret_errno;

2100

}

2101

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

2102

2103

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

2104

if(sd == -1){

2105

ret_errno = errno;

2106

perror_plus("socket");

2107

errno = old_errno;

2108

return ret_errno;

2109

}

2110

2111

if(quit_now){

2112

ret = close(sd);

2113

if(ret == -1){

2114

perror_plus("close");

2115

}

2116

errno = old_errno;

2117

return EINTR;

2118

}

2119

2120

if(debug){

2121

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

2122

interface);

2123

}

2124

2125

/* Raise privileges */

2126

ret_errno = raise_privileges();

2127

if(ret_errno != 0){

2128

errno = ret_errno;

2129

perror_plus("Failed to raise privileges");

2130

}

2131

2132

#ifdef __linux__

2133

int ret_linux;

2134

bool restore_loglevel = false;

2135

if(ret_errno == 0){

2136

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2137

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

2138

ret_linux = klogctl(8, NULL, 5);

2139

if(ret_linux == -1){

2140

perror_plus("klogctl");

2141

} else {

2142

restore_loglevel = true;

2143

}

2144

}

2145

#endif /* __linux__ */

2146

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

2147

ioctl_errno = errno;

2148

#ifdef __linux__

2149

if(restore_loglevel){

2150

ret_linux = klogctl(7, NULL, 0);

2151

if(ret_linux == -1){

2152

perror_plus("klogctl");

2153

}

2154

}

2155

#endif /* __linux__ */

2156

2157

/* If raise_privileges() succeeded above */

2158

if(ret_errno == 0){

2159

/* Lower privileges */

2160

ret_errno = lower_privileges();

2161

if(ret_errno != 0){

2162

errno = ret_errno;

2163

perror_plus("Failed to lower privileges");

2164

}

2165

}

2166

2167

/* Close the socket */

2168

ret = close(sd);

1578

/* Re-raise priviliges */

1579

raise_privileges();

1580

1581

#ifdef __linux__

1582

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1583

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

1584

ret = klogctl(8, NULL, 5);

1585

bool restore_loglevel = true;

1586

if(ret == -1){

1587

restore_loglevel = false;

1588

perror_plus("klogctl");

1589

}

1590

#endif /* __linux__ */

1591

1592

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1593

if(sd < 0){

1594

perror_plus("socket");

1595

#ifdef __linux__

1596

if(restore_loglevel){

1597

ret = klogctl(7, NULL, 0);

1598

if(ret == -1){

1599

perror_plus("klogctl");

1600

}

1601

}

1602

#endif /* __linux__ */

1603

/* Lower privileges */

1604

lower_privileges();

1605

return EX_OSERR;

1606

;

1607

}

1608

strcpy(network.ifr_name, interface);

1609

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

1610

if(ret == -1){

1611

perror_plus("ioctl SIOCGIFFLAGS");

1612

#ifdef __linux__

1613

if(restore_loglevel){

1614

ret = klogctl(7, NULL, 0);

1615

if(ret == -1){

1616

perror_plus("klogctl");

1617

}

1618

}

1619

#endif /* __linux__ */

1620

/* Lower privileges */

1621

lower_privileges();

1622

return EX_OSERR;

1623

}

1624

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

1625

network.ifr_flags |= IFF_UP;

1626

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

2169

1627

if(ret == -1){

2170

perror_plus("close");

2171

}

2172

2173

if(ret_setflags == -1){

2174

errno = ioctl_errno;

2175

1628

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2176

errno = old_errno;

2177

return ioctl_errno;

1629

#ifdef __linux__

1630

if(restore_loglevel){

1631

ret = klogctl(7, NULL, 0);

1632

if(ret == -1){

1633

perror_plus("klogctl");

1634

}

1635

}

1636

#endif /* __linux__ */

1637

/* Lower privileges */

1638

lower_privileges();

1639

return EX_OSERR;

2178

1640

}

2179

} else if(debug){

2180

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

2181

interface);

2182

1641

}

2183

2184

1642

/* Sleep checking until interface is running.

2185

1643

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

2186

1644

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

2187

if(interface_is_running(interface)){

1645

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

1646

if(ret == -1){

1647

perror_plus("ioctl SIOCGIFFLAGS");

1648

} else if(network.ifr_flags & IFF_RUNNING){

2188

1649

break;

2189

1650

}

2190

1651

struct timespec sleeptime = { .tv_nsec = 250000000 };

2193

1654

perror_plus("nanosleep");

2194

1655

}

2195

1656

}

2196

2197

errno = old_errno;

2198

return 0;

2199

}

2200

2201

__attribute__((nonnull, warn_unused_result))

2202

int take_down_interface(const char *const interface){

2203

int old_errno = errno;

2204

struct ifreq network;

2205

unsigned int if_index = if_nametoindex(interface);

2206

if(if_index == 0){

2207

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

2208

errno = old_errno;

2209

return ENXIO;

1657

/* Close the socket */

1658

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

1659

if(ret == -1){

1660

perror_plus("close");

2210

1661

}

2211

if(interface_is_up(interface)){

2212

int ret_errno = 0;

2213

int ioctl_errno = 0;

2214

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

2215

ret_errno = errno;

2216

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

2217

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

2218

errno = old_errno;

2219

return ret_errno;

2220

}

2221

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

2222

2223

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

2224

if(sd == -1){

2225

ret_errno = errno;

2226

perror_plus("socket");

2227

errno = old_errno;

2228

return ret_errno;

2229

}

2230

2231

if(debug){

2232

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

2233

interface);

2234

}

2235

2236

/* Raise privileges */

2237

ret_errno = raise_privileges();

2238

if(ret_errno != 0){

2239

errno = ret_errno;

2240

perror_plus("Failed to raise privileges");

2241

}

2242

2243

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

2244

ioctl_errno = errno;

2245

2246

/* If raise_privileges() succeeded above */

2247

if(ret_errno == 0){

2248

/* Lower privileges */

2249

ret_errno = lower_privileges();

2250

if(ret_errno != 0){

2251

errno = ret_errno;

2252

perror_plus("Failed to lower privileges");

2253

}

2254

}

2255

2256

/* Close the socket */

2257

int ret = close(sd);

1662

#ifdef __linux__

1663

if(restore_loglevel){

1664

/* Restores kernel loglevel to default */

1665

ret = klogctl(7, NULL, 0);

2258

1666

if(ret == -1){

2259

perror_plus("close");

2260

}

2261

2262

if(ret_setflags == -1){

2263

errno = ioctl_errno;

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2265

errno = old_errno;

2266

return ioctl_errno;

2267

}

2268

} else if(debug){

2269

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

2270

interface);

1667

perror_plus("klogctl");

1668

}

2271

1669

}

2272

2273

errno = old_errno;

2274

return 0;

1670

#endif /* __linux__ */

1671

/* Lower privileges */

1672

lower_privileges();

1673

return errno;

2275

1674

}

2276

1675

2277

1676

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

2278

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

2279

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

2280

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

2281

.current_server = NULL, .interfaces = NULL,

2282

.interfaces_size = 0 };

2283

1677

AvahiSServiceBrowser *sb = NULL;

2284

error_t ret_errno;

1678

int error;

2285

1679

int ret;

2286

1680

intmax_t tmpmax;

2287

1681

char *tmp;

2288

1682

int exitcode = EXIT_SUCCESS;

2289

char *interfaces_to_take_down = NULL;

2290

size_t interfaces_to_take_down_size = 0;

2291

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

2292

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

2293

char *tempdir = NULL;

1683

const char *interface = "";

1684

struct ifreq network;

1685

int sd = -1;

1686

bool take_down_interface = false;

1687

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

1688

bool tempdir_created = false;

2294

1689

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2295

1690

const char *seckey = PATHDIR "/" SECKEY;

2296

1691

const char *pubkey = PATHDIR "/" PUBKEY;

2297

const char *dh_params_file = NULL;

2298

char *interfaces_hooks = NULL;

2299

1692

2300

1693

bool gnutls_initialized = false;

2301

1694

bool gpgme_initialized = false;

2353

1746

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

2354

1747

" Diffie-Hellman key exchange",

2355

1748

.group = 2 },

2356

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

2357

.arg = "FILE",

2358

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

2359

" for the Diffie-Hellman key exchange",

2360

.group = 2 },

2361

1749

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

2362

1750

.arg = "STRING",

2363

1751

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

2397

1785

connect_to = arg;

2398

1786

break;

2399

1787

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

2400

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

2401

arg, (int)',');

2402

if(ret_errno != 0){

2403

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

2404

}

1788

interface = arg;

2405

1789

break;

2406

1790

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

2407

1791

seckey = arg;

2418

1802

}

2419

1803

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

2420

1804

break;

2421

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

2422

dh_params_file = arg;

2423

break;

2424

1805

case 130: /* --priority */

2425

1806

mc.priority = arg;

2426

1807

break;

2466

1847

.args_doc = "",

2467

1848

.doc = "Mandos client -- Get and decrypt"

2468

1849

" passwords from a Mandos server" };

2469

ret_errno = argp_parse(&argp, argc, argv,

2470

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2471

switch(ret_errno){

1850

ret = argp_parse(&argp, argc, argv,

1851

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1852

switch(ret){

2472

1853

case 0:

2473

1854

break;

2474

1855

case ENOMEM:

2475

1856

default:

2476

errno = ret_errno;

1857

errno = ret;

2477

1858

perror_plus("argp_parse");

2478

1859

exitcode = EX_OSERR;

2479

1860

goto end;

2482

1863

goto end;

2483

1864

}

2484

1865

}

2485

1866

2486

1867

{

2487

1868

/* Work around Debian bug #633582:

2488

1869

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

2489

1870

2490

/* Re-raise privileges */

2491

ret = raise_privileges();

2492

if(ret != 0){

2493

errno = ret;

2494

perror_plus("Failed to raise privileges");

2495

} else {

1871

/* Re-raise priviliges */

1872

if(raise_privileges() == 0){

2496

1873

struct stat st;

2497

1874

2498

1875

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

2512

1889

}

2513

1890

}

2514

1891

}

2515

close(seckey_fd);

1892

TEMP_FAILURE_RETRY(close(seckey_fd));

2516

1893

}

2517

1894

}

2518

1895

2519

1896

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

2520

1897

int pubkey_fd = open(pubkey, O_RDONLY);

2521

1898

if(pubkey_fd == -1){

2533

1910

}

2534

1911

}

2535

1912

}

2536

close(pubkey_fd);

2537

}

2538

}

2539

2540

if(dh_params_file != NULL

2541

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

2542

int dhparams_fd = open(dh_params_file, O_RDONLY);

2543

if(dhparams_fd == -1){

2544

perror_plus("open");

2545

} else {

2546

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

2547

if(ret == -1){

2548

perror_plus("fstat");

2549

} else {

2550

if(S_ISREG(st.st_mode)

2551

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

2552

ret = fchown(dhparams_fd, uid, gid);

2553

if(ret == -1){

2554

perror_plus("fchown");

2555

}

2556

}

2557

}

2558

close(dhparams_fd);

2559

}

2560

}

2561

1913

TEMP_FAILURE_RETRY(close(pubkey_fd));

1914

}

1915

}

1916

2562

1917

/* Lower privileges */

2563

ret = lower_privileges();

2564

if(ret != 0){

2565

errno = ret;

2566

perror_plus("Failed to lower privileges");

2567

}

2568

}

2569

}

2570

2571

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

2572

{

2573

char *interface = NULL;

2574

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

2575

interface))){

2576

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

2577

and if_nametoindex(interface) == 0){

2578

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

2579

fprintf_plus(stderr, "Not using nonexisting interface"

2580

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

2581

}

2582

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

2583

interface = NULL;

1918

errno = 0;

1919

ret = seteuid(uid);

1920

if(ret == -1){

1921

perror_plus("seteuid");

2584

1922

}

2585

1923

}

2586

1924

}

2587

1925

2588

1926

/* Run network hooks */

2589

{

2590

if(mc.interfaces != NULL){

2591

interfaces_hooks = malloc(mc.interfaces_size);

2592

if(interfaces_hooks == NULL){

1927

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

1928

goto end;

1929

}

1930

1931

if(not debug){

1932

avahi_set_log_function(empty_log);

1933

}

1934

1935

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

1936

struct dirent **direntries;

1937

/* First look for interfaces that are up */

1938

ret = scandir(sys_class_net, &direntries, up_interface,

1939

alphasort);

1940

if(ret == 0){

1941

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

1942

free(direntries);

1943

ret = scandir(sys_class_net, &direntries, good_interface,

1944

alphasort);

1945

}

1946

if(ret >= 1){

1947

/* Pick the first interface returned */

1948

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

1949

if(debug){

1950

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

1951

}

1952

if(interface == NULL){

2593

1953

perror_plus("malloc");

1954

free(direntries);

1955

exitcode = EXIT_FAILURE;

2594

1956

goto end;

2595

1957

}

2596

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

2597

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

1958

free(direntries);

1959

} else {

1960

free(direntries);

1961

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

1962

exitcode = EXIT_FAILURE;

1963

goto end;

2598

1964

}

2599

run_network_hooks("start", interfaces_hooks != NULL ?

2600

interfaces_hooks : "", delay);

2601

}

2602

2603

if(not debug){

2604

avahi_set_log_function(empty_log);

2605

1965

}

2606

1966

2607

1967

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

2608

1968

from the signal handler */

2609

1969

/* Initialize the pseudo-RNG for Avahi */

2610

1970

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

2611

simple_poll = avahi_simple_poll_new();

2612

if(simple_poll == NULL){

1971

mc.simple_poll = avahi_simple_poll_new();

1972

if(mc.simple_poll == NULL){

2613

1973

fprintf_plus(stderr,

2614

1974

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

2615

1975

exitcode = EX_UNAVAILABLE;

2679

2039

}

2680

2040

}

2681

2041

2682

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

2683

if(mc.interfaces == NULL){

2684

struct dirent **direntries = NULL;

2685

/* Look for any good interfaces */

2686

ret = scandir(sys_class_net, &direntries, good_interface,

2687

alphasort);

2688

if(ret >= 1){

2689

/* Add all found interfaces to interfaces list */

2690

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

2691

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

2692

direntries[i]->d_name);

2693

if(ret_errno != 0){

2694

errno = ret_errno;

2695

perror_plus("argz_add");

2696

free(direntries[i]);

2697

continue;

2698

}

2699

if(debug){

2700

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

2701

direntries[i]->d_name);

2702

}

2703

free(direntries[i]);

2704

}

2705

free(direntries);

2706

} else {

2707

if(ret == 0){

2708

free(direntries);

2709

}

2710

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

2711

exitcode = EXIT_FAILURE;

2712

goto end;

2713

}

2714

}

2715

2716

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

2717

{

2718

char *interface = NULL;

2719

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

2720

interface))){

2721

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

2722

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

2723

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

2724

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

2725

interface);

2726

interface = NULL;

2727

while((interface = argz_next(mc.interfaces,

2728

mc.interfaces_size, interface))){

2729

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

2730

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

2731

interface);

2732

interface = NULL;

2733

}

2734

}

2735

break;

2736

}

2737

bool interface_was_up = interface_is_up(interface);

2738

errno = bring_up_interface(interface, delay);

2739

if(not interface_was_up){

2740

if(errno != 0){

2741

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

2742

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

2743

} else {

2744

errno = argz_add(&interfaces_to_take_down,

2745

&interfaces_to_take_down_size,

2746

interface);

2747

if(errno != 0){

2748

perror_plus("argz_add");

2749

}

2750

}

2751

}

2752

}

2753

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

2754

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

2755

}

2756

}

2757

2758

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

2759

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

2760

if(debug){

2761

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

2762

mc.interfaces);

2763

}

2764

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

2042

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

2043

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

2044

ret = bring_up_interface(interface, delay);

2045

if(ret){

2046

errno = ret;

2047

perror_plus("Failed to bring up interface");

2048

}

2765

2049

}

2766

2050

2767

2051

if(quit_now){

2768

2052

goto end;

2769

2053

}

2770

2054

2771

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

2055

ret = init_gnutls_global(pubkey, seckey);

2772

2056

if(ret == -1){

2773

2057

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

2774

2058

exitcode = EX_UNAVAILABLE;

2781

2065

goto end;

2782

2066

}

2783

2067

2784

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

2785

tempdir = mkdtemp(run_tempdir);

2786

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

2787

if(debug){

2788

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

2789

run_tempdir, old_tempdir);

2790

}

2791

tempdir = mkdtemp(old_tempdir);

2792

}

2793

if(tempdir == NULL){

2068

if(mkdtemp(tempdir) == NULL){

2794

2069

perror_plus("mkdtemp");

2795

2070

goto end;

2796

2071

}

2072

tempdir_created = true;

2797

2073

2798

2074

if(quit_now){

2799

2075

goto end;

2800

2076

}

2801

2077

2802

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

2078

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

2803

2079

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

2804

2080

exitcode = EX_UNAVAILABLE;

2805

2081

goto end;

2826

2102

goto end;

2827

2103

}

2828

2104

2829

in_port_t port;

2105

uint16_t port;

2830

2106

errno = 0;

2831

2107

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

2832

2108

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

2833

or tmpmax != (in_port_t)tmpmax){

2109

or tmpmax != (uint16_t)tmpmax){

2834

2110

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

2835

2111

exitcode = EX_USAGE;

2836

2112

goto end;

2837

2113

}

2838

2114

2839

2115

if(quit_now){

2840

2116

goto end;

2841

2117

}

2842

2118

2843

port = (in_port_t)tmpmax;

2119

port = (uint16_t)tmpmax;

2844

2120

*address = '\0';

2845

2121

/* Colon in address indicates IPv6 */

2846

2122

int af;

2862

2138

}

2863

2139

2864

2140

while(not quit_now){

2865

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

2866

&mc);

2141

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

2867

2142

if(quit_now or ret == 0){

2868

2143

break;

2869

2144

}

2871

2146

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

2872

2147

(int)retry_interval);

2873

2148

}

2874

sleep((unsigned int)retry_interval);

2149

sleep((int)retry_interval);

2875

2150

}

2876

2151

2877

if(not quit_now){

2152

if (not quit_now){

2878

2153

exitcode = EXIT_SUCCESS;

2879

2154

}

2880

2155

2895

2170

config.publish_domain = 0;

2896

2171

2897

2172

/* Allocate a new server */

2898

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2899

&config, NULL, NULL, &ret);

2173

mc.server = avahi_server_new(avahi_simple_poll_get

2174

(mc.simple_poll), &config, NULL,

2175

NULL, &error);

2900

2176

2901

2177

/* Free the Avahi configuration data */

2902

2178

avahi_server_config_free(&config);

2905

2181

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

2906

2182

if(mc.server == NULL){

2907

2183

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

2908

avahi_strerror(ret));

2184

avahi_strerror(error));

2909

2185

exitcode = EX_UNAVAILABLE;

2910

2186

goto end;

2911

2187

}

2917

2193

/* Create the Avahi service browser */

2918

2194

sb = avahi_s_service_browser_new(mc.server, if_index,

2919

2195

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2920

NULL, 0, browse_callback,

2921

(void *)&mc);

2196

NULL, 0, browse_callback, NULL);

2922

2197

if(sb == NULL){

2923

2198

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

2924

2199

avahi_strerror(avahi_server_errno(mc.server)));

2935

2210

if(debug){

2936

2211

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

2937

2212

}

2938

2939

ret = avahi_loop_with_timeout(simple_poll,

2940

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

2213

2214

ret = avahi_loop_with_timeout(mc.simple_poll,

2215

(int)(retry_interval * 1000));

2941

2216

if(debug){

2942

2217

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

2943

2218

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

2950

2225

}

2951

2226

2952

2227

/* Cleanup things */

2953

free(mc.interfaces);

2954

2955

2228

if(sb != NULL)

2956

2229

avahi_s_service_browser_free(sb);

2957

2230

2958

2231

if(mc.server != NULL)

2959

2232

avahi_server_free(mc.server);

2960

2233

2961

if(simple_poll != NULL)

2962

avahi_simple_poll_free(simple_poll);

2234

if(mc.simple_poll != NULL)

2235

avahi_simple_poll_free(mc.simple_poll);

2963

2236

2964

2237

if(gnutls_initialized){

2965

2238

gnutls_certificate_free_credentials(mc.cred);

2239

gnutls_global_deinit();

2966

2240

gnutls_dh_params_deinit(mc.dh_params);

2967

2241

}

2968

2242

2976

2250

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

2977

2251

while(mc.current_server != NULL){

2978

2252

server *next = mc.current_server->next;

2979

#ifdef __GNUC__

2980

#pragma GCC diagnostic push

2981

#pragma GCC diagnostic ignored "-Wcast-qual"

2982

#endif

2983

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

2984

#ifdef __GNUC__

2985

#pragma GCC diagnostic pop

2986

#endif

2987

2253

free(mc.current_server);

2988

2254

mc.current_server = next;

2989

2255

}

2990

2256

}

2991

2257

2992

/* Re-raise privileges */

2258

/* Run network hooks */

2259

run_network_hooks("stop", interface, delay);

2260

2261

/* Re-raise priviliges */

2993

2262

{

2994

ret = raise_privileges();

2995

if(ret != 0){

2996

errno = ret;

2997

perror_plus("Failed to raise privileges");

2998

} else {

2999

3000

/* Run network hooks */

3001

run_network_hooks("stop", interfaces_hooks != NULL ?

3002

interfaces_hooks : "", delay);

3003

3004

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

3005

{

3006

char *interface = NULL;

3007

while((interface=argz_next(interfaces_to_take_down,

3008

interfaces_to_take_down_size,

3009

interface))){

3010

ret = take_down_interface(interface);

3011

if(ret != 0){

3012

errno = ret;

3013

perror_plus("Failed to take down interface");

3014

}

3015

}

3016

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

3017

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

3018

" down\n");

3019

}

3020

}

3021

}

2263

raise_privileges();

3022

2264

3023

ret = lower_privileges_permanently();

3024

if(ret != 0){

3025

errno = ret;

3026

perror_plus("Failed to lower privileges permanently");

2265

/* Take down the network interface */

2266

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

2267

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

2268

if(ret == -1){

2269

perror_plus("ioctl SIOCGIFFLAGS");

2270

} else if(network.ifr_flags & IFF_UP){

2271

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

2272

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

2273

if(ret == -1){

2274

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2275

}

2276

}

2277

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

2278

if(ret == -1){

2279

perror_plus("close");

2280

}

3027

2281

}

3028

2282

}

3029

3030

free(interfaces_to_take_down);

3031

free(interfaces_hooks);

3032

3033

void clean_dir_at(int base, const char * const dirname,

3034

uintmax_t level){

2283

/* Lower privileges permanently */

2284

errno = 0;

2285

ret = setuid(uid);

2286

if(ret == -1){

2287

perror_plus("setuid");

2288

}

2289

2290

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

2291

if(tempdir_created){

3035

2292

struct dirent **direntries = NULL;

3036

int dret;

3037

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3038

O_RDONLY

3039

| O_NOFOLLOW

3040

| O_DIRECTORY

3041

| O_PATH));

3042

if(dir_fd == -1){

3043

perror_plus("open");

3044

}

3045

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

3046

notdotentries, alphasort);

3047

if(numentries >= 0){

2293

struct dirent *direntry = NULL;

2294

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

2295

alphasort);

2296

if (numentries > 0){

3048

2297

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

3049

if(debug){

3050

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3051

dirname, direntries[i]->d_name);

3052

}

3053

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3054

if(dret == -1){

3055

if(errno == EISDIR){

3056

dret = unlinkat(dir_fd, direntries[i]->d_name,

3057

AT_REMOVEDIR);

3058

}

3059

if((dret == -1) and (errno == ENOTEMPTY)

3060

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3061

== 0) and (level == 0)){

3062

/* Recurse only in this special case */

3063

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3064

dret = 0;

3065

}

3066

if(dret == -1){

3067

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3068

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

3069

}

3070

}

3071

free(direntries[i]);

3072

}

3073

3074

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

3075

free(direntries);

3076

if(numentries == -1){

3077

perror_plus("scandirat");

3078

}

3079

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3080

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

3081

perror_plus("rmdir");

3082

}

3083

} else {

3084

perror_plus("scandirat");

3085

}

3086

close(dir_fd);

3087

}

3088

3089

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

3090

if(tempdir != NULL){

3091

clean_dir_at(-1, tempdir, 0);

2298

direntry = direntries[i];

2299

char *fullname = NULL;

2300

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

2301

direntry->d_name);

2302

if(ret < 0){

2303

perror_plus("asprintf");

2304

continue;

2305

}

2306

ret = remove(fullname);

2307

if(ret == -1){

2308

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

2309

strerror(errno));

2310

}

2311

free(fullname);

2312

}

2313

}

2314

2315

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

2316

free(direntries);

2317

if (numentries == -1){

2318

perror_plus("scandir");

2319

}

2320

ret = rmdir(tempdir);

2321

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

2322

perror_plus("rmdir");

2323

}

3092

2324

}

3093

2325

3094

2326

if(quit_now){