/mandos/release : revision 237.7.309

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

10

*

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* Everything else is

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12

13

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*

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* 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

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#define _FILE_OFFSET_BITS 64

38

#endif

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#endif /* not _FILE_OFFSET_BITS */

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40

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

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

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stdout, ferror(), remove() */

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stdout, ferror() */

44

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

45

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

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

55

opendir(), DIR */

56

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

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

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inet_pton(), connect() */

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

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inet_pton(), connect(),

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getnameinfo() */

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

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

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*/

62

63

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

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*/

73

74

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

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

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

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

76

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

77

unlinkat() */

78

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

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

78

80

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

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81

argp_state, struct argp,

91

93

argz_delete(), argz_append(),

92

94

argz_stringify(), argz_add(),

93

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

94

98

95

99

#ifdef __linux__

96

100

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

138

142

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

139

143

char *connect_to = NULL;

140

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

141

146

uid_t uid = 65534;

142

147

gid_t gid = 65534;

143

148

154

159

155

160

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

156

161

typedef struct {

157

AvahiSimplePoll *simple_poll;

158

162

AvahiServer *server;

159

163

gnutls_certificate_credentials_t cred;

160

164

unsigned int dh_bits;

162

166

const char *priority;

163

167

gpgme_ctx_t ctx;

164

168

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

165

171

} mandos_context;

166

172

167

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

168

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

169

.dh_bits = 1024, .priority = "SECURE256"

170

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

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.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

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175

173

176

sig_atomic_t quit_now = 0;

174

177

int signal_received = 0;

182

185

perror(print_text);

183

186

}

184

187

185

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

188

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

186

189

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

187

190

va_list ap;

188

191

va_start (ap, format);

189

192

190

193

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

191

194

program_invocation_short_name));

192

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

195

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

193

196

}

194

197

195

198

/*

197

200

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

198

201

* "buffer_length" is how much is already used.

199

202

*/

203

__attribute__((nonnull, warn_unused_result))

200

204

size_t incbuffer(char **buffer, size_t buffer_length,

201

205

size_t buffer_capacity){

202

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

203

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

204

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;

205

213

return 0;

206

214

}

215

*buffer = new_buf;

207

216

buffer_capacity += BUFFER_SIZE;

208

217

}

209

218

return buffer_capacity;

210

219

}

211

220

212

221

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

222

__attribute__((nonnull, warn_unused_result))

213

223

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

214

int af){

224

int af, server **current_server){

215

225

int ret;

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

217

227

if(new_server == NULL){

224

234

.af = af };

225

235

if(new_server->ip == NULL){

226

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);

227

252

return false;

228

253

}

229

254

/* Special case of first server */

230

if (mc.current_server == NULL){

255

if(*current_server == NULL){

231

256

new_server->next = new_server;

232

257

new_server->prev = new_server;

233

mc.current_server = new_server;

234

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

258

*current_server = new_server;

235

259

} else {

236

new_server->next = mc.current_server;

237

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;

238

263

new_server->prev->next = new_server;

239

mc.current_server->prev = new_server;

240

}

241

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

242

if(ret == -1){

243

perror_plus("clock_gettime");

244

return false;

264

(*current_server)->prev = new_server;

245

265

}

246

266

return true;

247

267

}

249

269

/*

250

270

* Initialize GPGME.

251

271

*/

252

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

253

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){

254

277

gpgme_error_t rc;

255

278

gpgme_engine_info_t engine_info;

256

279

257

258

280

/*

259

281

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

260

282

*/

261

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

262

284

int ret;

263

285

int fd;

264

286

gpgme_data_t pgp_data;

276

298

return false;

277

299

}

278

300

279

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

280

302

if(rc != GPG_ERR_NO_ERROR){

281

303

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

282

304

gpgme_strsource(rc), gpgme_strerror(rc));

326

348

}

327

349

328

350

/* Create new GPGME "context" */

329

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

351

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

330

352

if(rc != GPG_ERR_NO_ERROR){

331

353

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

332

354

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

345

367

* Decrypt OpenPGP data.

346

368

* Returns -1 on error

347

369

*/

370

__attribute__((nonnull, warn_unused_result))

348

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

349

372

size_t crypto_size,

350

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

351

375

gpgme_data_t dh_crypto, dh_plain;

352

376

gpgme_error_t rc;

353

377

ssize_t ret;

379

403

380

404

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

381

405

data buffer */

382

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

406

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

383

407

if(rc != GPG_ERR_NO_ERROR){

384

408

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

385

409

gpgme_strsource(rc), gpgme_strerror(rc));

386

410

plaintext_length = -1;

387

411

if(debug){

388

412

gpgme_decrypt_result_t result;

389

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

390

414

if(result == NULL){

391

415

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

392

416

} else {

469

493

return plaintext_length;

470

494

}

471

495

472

static const char * safer_gnutls_strerror(int value){

496

__attribute__((warn_unused_result, const))

497

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

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

473

505

const char *ret = gnutls_strerror(value);

474

if(ret == NULL)

475

ret = "(unknown)";

476

return ret;

506

return safe_string(ret);

477

507

}

478

508

479

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

480

511

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

481

512

const char* string){

482

513

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

483

514

}

484

515

516

__attribute__((nonnull, warn_unused_result))

485

517

static int init_gnutls_global(const char *pubkeyfilename,

486

const char *seckeyfilename){

518

const char *seckeyfilename,

519

mandos_context *mc){

487

520

int ret;

521

unsigned int uret;

488

522

489

523

if(debug){

490

524

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

506

540

}

507

541

508

542

/* OpenPGP credentials */

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

510

544

if(ret != GNUTLS_E_SUCCESS){

511

545

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

512

546

safer_gnutls_strerror(ret));

522

556

}

523

557

524

558

ret = gnutls_certificate_set_openpgp_key_file

525

(mc.cred, pubkeyfilename, seckeyfilename,

559

(mc->cred, pubkeyfilename, seckeyfilename,

526

560

GNUTLS_OPENPGP_FMT_BASE64);

527

561

if(ret != GNUTLS_E_SUCCESS){

528

562

fprintf_plus(stderr,

534

568

}

535

569

536

570

/* GnuTLS server initialization */

537

ret = gnutls_dh_params_init(&mc.dh_params);

571

ret = gnutls_dh_params_init(&mc->dh_params);

538

572

if(ret != GNUTLS_E_SUCCESS){

539

573

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

540

574

" initialization: %s\n",

541

575

safer_gnutls_strerror(ret));

542

576

goto globalfail;

543

577

}

544

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

578

if(mc->dh_bits == 0){

579

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

580

/* Try to read the private key file */

581

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

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

585

while(true){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

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

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

627

if(ret != GNUTLS_E_SUCCESS){

628

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

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

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

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

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

663

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

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

668

} else {

669

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

670

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

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

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

677

mc->dh_bits);

678

}

679

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

545

680

if(ret != GNUTLS_E_SUCCESS){

546

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

547

safer_gnutls_strerror(ret));

681

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

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

548

683

goto globalfail;

549

684

}

550

685

551

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

686

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

552

687

553

688

return 0;

554

689

555

690

globalfail:

556

691

557

gnutls_certificate_free_credentials(mc.cred);

692

gnutls_certificate_free_credentials(mc->cred);

558

693

gnutls_global_deinit();

559

gnutls_dh_params_deinit(mc.dh_params);

694

gnutls_dh_params_deinit(mc->dh_params);

560

695

return -1;

561

696

}

562

697

563

static int init_gnutls_session(gnutls_session_t *session){

698

__attribute__((nonnull, warn_unused_result))

699

static int init_gnutls_session(gnutls_session_t *session,

700

mandos_context *mc){

564

701

int ret;

565

702

/* GnuTLS session creation */

566

703

do {

578

715

{

579

716

const char *err;

580

717

do {

581

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

718

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

582

719

if(quit_now){

583

720

gnutls_deinit(*session);

584

721

return -1;

595

732

596

733

do {

597

734

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

598

mc.cred);

735

mc->cred);

599

736

if(quit_now){

600

737

gnutls_deinit(*session);

601

738

return -1;

611

748

/* ignore client certificate if any. */

612

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

613

750

614

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

615

752

616

753

return 0;

617

754

}

620

757

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

621

758

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

622

759

760

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

761

__attribute__((warn_unused_result))

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

765

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

766

ret_errno = errno;

767

}

768

errno = old_errno;

769

return ret_errno;

770

}

771

772

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

773

__attribute__((warn_unused_result))

774

error_t raise_privileges_permanently(void){

775

error_t old_errno = errno;

776

error_t ret_errno = raise_privileges();

777

if(ret_errno != 0){

778

errno = old_errno;

779

return ret_errno;

780

}

781

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

782

ret_errno = errno;

783

}

784

errno = old_errno;

785

return ret_errno;

786

}

787

788

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

789

__attribute__((warn_unused_result))

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

793

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

794

ret_errno = errno;

795

}

796

errno = old_errno;

797

return ret_errno;

798

}

799

800

/* Lower privileges permanently */

801

__attribute__((warn_unused_result))

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

805

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

806

ret_errno = errno;

807

}

808

errno = old_errno;

809

return ret_errno;

810

}

811

812

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

813

__attribute__((nonnull, warn_unused_result))

814

static bool add_delete_local_route(const bool add,

815

const char *address,

816

AvahiIfIndex if_index){

817

int ret;

818

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

819

char add_arg[] = "add";

820

char delete_arg[] = "delete";

821

char debug_flag[] = "--debug";

822

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

823

if(pluginhelperdir == NULL){

824

if(debug){

825

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

826

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

827

}

828

return false;

829

}

830

831

char interface[IF_NAMESIZE];

832

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

833

perror_plus("if_indextoname");

834

return false;

835

}

836

837

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

838

if(devnull == -1){

839

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

840

return false;

841

}

842

pid_t pid = fork();

843

if(pid == 0){

844

/* Child */

845

/* Raise privileges */

846

errno = raise_privileges_permanently();

847

if(errno != 0){

848

perror_plus("Failed to raise privileges");

849

/* _exit(EX_NOPERM); */

850

} else {

851

/* Set group */

852

errno = 0;

853

ret = setgid(0);

854

if(ret == -1){

855

perror_plus("setgid");

856

_exit(EX_NOPERM);

857

}

858

/* Reset supplementary groups */

859

errno = 0;

860

ret = setgroups(0, NULL);

861

if(ret == -1){

862

perror_plus("setgroups");

863

_exit(EX_NOPERM);

864

}

865

}

866

ret = dup2(devnull, STDIN_FILENO);

867

if(ret == -1){

868

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

869

_exit(EX_OSERR);

870

}

871

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

872

if(ret == -1){

873

perror_plus("close");

874

_exit(EX_OSERR);

875

}

876

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

877

if(ret == -1){

878

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

879

_exit(EX_OSERR);

880

}

881

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

882

O_RDONLY

883

| O_DIRECTORY

884

| O_PATH

885

| O_CLOEXEC));

886

if(helperdir_fd == -1){

887

perror_plus("open");

888

_exit(EX_UNAVAILABLE);

889

}

890

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

891

helper, O_RDONLY));

892

if(helper_fd == -1){

893

perror_plus("openat");

894

_exit(EX_UNAVAILABLE);

895

}

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

897

#ifdef __GNUC__

898

#pragma GCC diagnostic push

899

#pragma GCC diagnostic ignored "-Wcast-qual"

900

#endif

901

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

902

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

903

interface, debug ? debug_flag : NULL, NULL },

904

environ) == -1){

905

#ifdef __GNUC__

906

#pragma GCC diagnostic pop

907

#endif

908

perror_plus("fexecve");

909

_exit(EXIT_FAILURE);

910

}

911

}

912

if(pid == -1){

913

perror_plus("fork");

914

return false;

915

}

916

int status;

917

pid_t pret = -1;

918

errno = 0;

919

do {

920

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

921

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

922

int errno_raising = 0;

923

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

924

errno_raising = errno;

925

perror_plus("Failed to raise privileges in order to"

926

" kill helper program");

927

}

928

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

929

perror_plus("kill");

930

}

931

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

932

perror_plus("Failed to lower privileges after killing"

933

" helper program");

934

}

935

return false;

936

}

937

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

938

if(pret == -1){

939

perror_plus("waitpid");

940

return false;

941

}

942

if(WIFEXITED(status)){

943

if(WEXITSTATUS(status) != 0){

944

fprintf_plus(stderr, "Error: iprouteadddel exited"

945

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

946

return false;

947

}

948

return true;

949

}

950

if(WIFSIGNALED(status)){

951

fprintf_plus(stderr, "Error: iprouteadddel died by"

952

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

953

return false;

954

}

955

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

956

return false;

957

}

958

959

__attribute__((nonnull, warn_unused_result))

960

static bool add_local_route(const char *address,

961

AvahiIfIndex if_index){

962

if(debug){

963

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

964

}

965

return add_delete_local_route(true, address, if_index);

966

}

967

968

__attribute__((nonnull, warn_unused_result))

969

static bool delete_local_route(const char *address,

970

AvahiIfIndex if_index){

971

if(debug){

972

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

973

}

974

return add_delete_local_route(false, address, if_index);

975

}

976

623

977

/* Called when a Mandos server is found */

978

__attribute__((nonnull, warn_unused_result))

624

979

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

625

980

AvahiIfIndex if_index,

626

int af){

981

int af, mandos_context *mc){

627

982

int ret, tcp_sd = -1;

628

983

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

984

struct sockaddr_storage to;

633

985

char *buffer = NULL;

634

986

char *decrypted_buffer = NULL;

635

987

size_t buffer_length = 0;

638

990

int retval = -1;

639

991

gnutls_session_t session;

640

992

int pf; /* Protocol family */

993

bool route_added = false;

641

994

642

995

errno = 0;

643

996

659

1012

return -1;

660

1013

}

661

1014

662

ret = init_gnutls_session(&session);

1015

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

1016

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

1017

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

1018

bool match = false;

1019

{

1020

char *interface = NULL;

1021

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

1022

interface))){

1023

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

1024

match = true;

1025

break;

1026

}

1027

}

1028

}

1029

if(not match){

1030

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

1031

connect to the server */

1032

if(debug){

1033

char interface[IF_NAMESIZE];

1034

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

1035

perror_plus("if_indextoname");

1036

} else {

1037

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

1038

" \"%s\"\n",

1039

if_indextoname((unsigned int)if_index,

1040

interface));

1041

}

1042

}

1043

return -1;

1044

}

1045

}

1046

1047

ret = init_gnutls_session(&session, mc);

663

1048

if(ret != 0){

664

1049

return -1;

665

1050

}

669

1054

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

670

1055

}

671

1056

672

tcp_sd = socket(pf, SOCK_STREAM, 0);

1057

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

673

1058

if(tcp_sd < 0){

674

1059

int e = errno;

675

1060

perror_plus("socket");

684

1069

685

1070

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

686

1071

if(af == AF_INET6){

687

to.in6.sin6_family = (sa_family_t)af;

688

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

1072

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

1073

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

689

1074

} else { /* IPv4 */

690

to.in.sin_family = (sa_family_t)af;

691

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

1075

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

1076

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

692

1077

}

693

1078

if(ret < 0 ){

694

1079

int e = errno;

703

1088

goto mandos_end;

704

1089

}

705

1090

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

707

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

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

709

-Wunreachable-code*/

1091

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

1092

if(IN6_IS_ADDR_LINKLOCAL

1093

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

710

1094

if(if_index == AVAHI_IF_UNSPEC){

711

1095

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

712

1096

" incomplete without a network interface\n");

714

1098

goto mandos_end;

715

1099

}

716

1100

/* Set the network interface number as scope */

717

to.in6.sin6_scope_id = (uint32_t)if_index;

1101

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

718

1102

}

719

1103

} else {

720

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

721

-Wconversion and

722

-Wunreachable-code */

1104

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

723

1105

}

724

1106

725

1107

if(quit_now){

742

1124

}

743

1125

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

1126

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

745

const char *pcret;

746

if(af == AF_INET6){

747

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

748

sizeof(addrstr));

749

} else {

750

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

751

sizeof(addrstr));

752

}

753

if(pcret == NULL){

754

perror_plus("inet_ntop");

755

} else {

756

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

757

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

758

}

759

}

760

}

761

762

if(quit_now){

763

errno = EINTR;

764

goto mandos_end;

765

}

766

767

if(af == AF_INET6){

768

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

769

} else {

770

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

771

}

772

if(ret < 0){

773

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

774

int e = errno;

775

perror_plus("connect");

776

errno = e;

777

}

778

goto mandos_end;

779

}

780

781

if(quit_now){

782

errno = EINTR;

783

goto mandos_end;

1127

if(af == AF_INET6){

1128

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

1129

sizeof(struct sockaddr_in6),

1130

addrstr, sizeof(addrstr), NULL, 0,

1131

NI_NUMERICHOST);

1132

} else {

1133

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

1134

sizeof(struct sockaddr_in),

1135

addrstr, sizeof(addrstr), NULL, 0,

1136

NI_NUMERICHOST);

1137

}

1138

if(ret == EAI_SYSTEM){

1139

perror_plus("getnameinfo");

1140

} else if(ret != 0) {

1141

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

1142

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

1143

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

1144

}

1145

}

1146

1147

if(quit_now){

1148

errno = EINTR;

1149

goto mandos_end;

1150

}

1151

1152

while(true){

1153

if(af == AF_INET6){

1154

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

1155

sizeof(struct sockaddr_in6));

1156

} else {

1157

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

1158

sizeof(struct sockaddr_in));

1159

}

1160

if(ret < 0){

1161

if(errno == ENETUNREACH

1162

and if_index != AVAHI_IF_UNSPEC

1163

and connect_to == NULL

1164

and not route_added and

1165

((af == AF_INET6 and not

1166

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1167

&to)->sin6_addr)))

1168

or (af == AF_INET and

1169

/* Not a a IPv4LL address */

1170

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

1171

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

1172

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

1173

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

1174

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

1175

connect to a Mandos server announced by Avahi on a server

1176

host with a global address. Work around this by retrying

1177

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

1178

1179

Avahi bug reference:

1180

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

1181

https://bugs.debian.org/587961

1182

*/

1183

if(debug){

1184

fprintf_plus(stderr, "Mandos server unreachable, trying"

1185

" direct route\n");

1186

}

1187

int e = errno;

1188

route_added = add_local_route(ip, if_index);

1189

if(route_added){

1190

continue;

1191

}

1192

errno = e;

1193

}

1194

if(errno != ECONNREFUSED or debug){

1195

int e = errno;

1196

perror_plus("connect");

1197

errno = e;

1198

}

1199

goto mandos_end;

1200

}

1201

1202

if(quit_now){

1203

errno = EINTR;

1204

goto mandos_end;

1205

}

1206

break;

784

1207

}

785

1208

786

1209

const char *out = mandos_protocol_version;

937

1360

if(buffer_length > 0){

938

1361

ssize_t decrypted_buffer_size;

939

1362

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

940

&decrypted_buffer);

1363

&decrypted_buffer, mc);

941

1364

if(decrypted_buffer_size >= 0){

942

1365

943

1366

written = 0;

969

1392

970

1393

mandos_end:

971

1394

{

1395

if(route_added){

1396

if(not delete_local_route(ip, if_index)){

1397

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

1398

" interface %d", ip, if_index);

1399

}

1400

}

972

1401

int e = errno;

973

1402

free(decrypted_buffer);

974

1403

free(buffer);

991

1420

return retval;

992

1421

}

993

1422

1423

__attribute__((nonnull))

994

1424

static void resolve_callback(AvahiSServiceResolver *r,

995

1425

AvahiIfIndex interface,

996

1426

AvahiProtocol proto,

1004

1434

AVAHI_GCC_UNUSED AvahiStringList *txt,

1005

1435

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1436

flags,

1007

AVAHI_GCC_UNUSED void* userdata){

1437

void *mc){

1008

1438

if(r == NULL){

1009

1439

return;

1010

1440

}

1013

1443

timed out */

1014

1444

1015

1445

if(quit_now){

1446

avahi_s_service_resolver_free(r);

1016

1447

return;

1017

1448

}

1018

1449

1022

1453

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

1023

1454

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

1024

1455

domain,

1025

avahi_strerror(avahi_server_errno(mc.server)));

1456

avahi_strerror(avahi_server_errno

1457

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

1026

1458

break;

1027

1459

1028

1460

case AVAHI_RESOLVER_FOUND:

1036

1468

}

1037

1469

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

1038

1470

interface,

1039

avahi_proto_to_af(proto));

1471

avahi_proto_to_af(proto),

1472

mc);

1040

1473

if(ret == 0){

1041

avahi_simple_poll_quit(mc.simple_poll);

1474

avahi_simple_poll_quit(simple_poll);

1042

1475

} else {

1043

1476

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

1044

avahi_proto_to_af(proto))){

1477

avahi_proto_to_af(proto),

1478

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

1045

1479

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

1046

1480

" list\n", name);

1047

1481

}

1060

1494

const char *domain,

1061

1495

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1496

flags,

1063

AVAHI_GCC_UNUSED void* userdata){

1497

void *mc){

1064

1498

if(b == NULL){

1065

1499

return;

1066

1500

}

1077

1511

case AVAHI_BROWSER_FAILURE:

1078

1512

1079

1513

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1514

avahi_strerror(avahi_server_errno

1515

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

1516

avahi_simple_poll_quit(simple_poll);

1082

1517

return;

1083

1518

1084

1519

case AVAHI_BROWSER_NEW:

1087

1522

the callback function is called the Avahi server will free the

1088

1523

resolver for us. */

1089

1524

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1525

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

1526

interface, protocol, name, type,

1527

domain, protocol, 0,

1528

resolve_callback, mc) == NULL)

1093

1529

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

1094

1530

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1531

avahi_strerror(avahi_server_errno

1532

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

1096

1533

break;

1097

1534

1098

1535

case AVAHI_BROWSER_REMOVE:

1117

1554

signal_received = sig;

1118

1555

int old_errno = errno;

1119

1556

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1557

if(simple_poll != NULL){

1558

avahi_simple_poll_quit(simple_poll);

1122

1559

}

1123

1560

errno = old_errno;

1124

1561

}

1125

1562

1563

__attribute__((nonnull, warn_unused_result))

1126

1564

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

1127

1565

int ret;

1128

1566

error_t ret_errno;

1147

1585

return true;

1148

1586

}

1149

1587

1588

__attribute__((nonnull, warn_unused_result))

1150

1589

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

1151

1590

1152

1591

/* Reject the loopback device */

1194

1633

* corresponds to an acceptable network device.

1195

1634

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

1196

1635

*/

1636

__attribute__((nonnull, warn_unused_result))

1197

1637

int good_interface(const struct dirent *if_entry){

1198

1638

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

1199

1639

return 0;

1217

1657

/*

1218

1658

* This function determines if a network interface is up.

1219

1659

*/

1660

__attribute__((nonnull, warn_unused_result))

1220

1661

bool interface_is_up(const char *interface){

1221

1662

struct ifreq ifr;

1222

1663

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

1233

1674

/*

1234

1675

* This function determines if a network interface is running

1235

1676

*/

1677

__attribute__((nonnull, warn_unused_result))

1236

1678

bool interface_is_running(const char *interface){

1237

1679

struct ifreq ifr;

1238

1680

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

1246

1688

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

1247

1689

}

1248

1690

1691

__attribute__((nonnull, pure, warn_unused_result))

1249

1692

int notdotentries(const struct dirent *direntry){

1250

1693

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

1251

1694

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

1258

1701

}

1259

1702

1260

1703

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

1704

__attribute__((nonnull, warn_unused_result))

1261

1705

int runnable_hook(const struct dirent *direntry){

1262

1706

int ret;

1263

1707

size_t sret;

1271

1715

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

1272

1716

"abcdefghijklmnopqrstuvwxyz"

1273

1717

"0123456789"

1274

"_-");

1718

"_.-");

1275

1719

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

1276

1720

/* Contains non-allowed characters */

1277

1721

if(debug){

1281

1725

return 0;

1282

1726

}

1283

1727

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);

1728

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

1292

1729

if(ret == -1){

1293

1730

if(debug){

1294

1731

perror_plus("Could not stat hook");

1318

1755

return 1;

1319

1756

}

1320

1757

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1758

__attribute__((nonnull, warn_unused_result))

1759

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1760

mandos_context *mc){

1322

1761

int ret;

1323

1762

struct timespec now;

1324

1763

struct timespec waited_time;

1325

1764

intmax_t block_time;

1326

1765

1327

1766

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1767

if(mc->current_server == NULL){

1768

if(debug){

1330

1769

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

1331

1770

" No timeout!\n");

1332

1771

}

1333

1772

ret = avahi_simple_poll_iterate(s, -1);

1334

1773

} else {

1335

if (debug){

1774

if(debug){

1336

1775

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

1337

1776

" it, or wait\n");

1338

1777

}

1345

1784

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

1346

1785

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

1347

1786

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1787

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

1349

1788

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1789

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

1351

1790

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

1352

1791

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

1353

1792

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

1355

1794

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

1356

1795

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

1357

1796

1358

if (debug){

1797

if(debug){

1359

1798

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

1360

1799

block_time);

1361

1800

}

1362

1801

1363

1802

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);

1803

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

1804

mc->current_server->port,

1805

mc->current_server->if_index,

1806

mc->current_server->af, mc);

1368

1807

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1808

avahi_simple_poll_quit(s);

1370

1809

return 0;

1371

1810

}

1372

1811

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1812

&mc->current_server->last_seen);

1374

1813

if(ret == -1){

1375

1814

perror_plus("clock_gettime");

1376

1815

return -1;

1377

1816

}

1378

mc.current_server = mc.current_server->next;

1817

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

1379

1818

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

1380

1819

servers, but don't block */

1381

1820

}

1383

1822

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

1384

1823

}

1385

1824

if(ret != 0){

1386

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

1825

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

1387

1826

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

1388

1827

}

1389

1828

}

1390

1829

}

1391

1830

}

1392

1831

1393

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

1394

error_t raise_privileges(void){

1395

error_t old_errno = errno;

1396

error_t ret_errno = 0;

1397

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

1398

ret_errno = errno;

1399

perror_plus("seteuid");

1400

}

1401

errno = old_errno;

1402

return ret_errno;

1403

}

1404

1405

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

1406

error_t raise_privileges_permanently(void){

1407

error_t old_errno = errno;

1408

error_t ret_errno = raise_privileges();

1409

if(ret_errno != 0){

1410

errno = old_errno;

1411

return ret_errno;

1412

}

1413

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

1414

ret_errno = errno;

1415

perror_plus("seteuid");

1416

}

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

1421

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

1422

error_t lower_privileges(void){

1423

error_t old_errno = errno;

1424

error_t ret_errno = 0;

1425

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

1426

ret_errno = errno;

1427

perror_plus("seteuid");

1428

}

1429

errno = old_errno;

1430

return ret_errno;

1431

}

1432

1433

/* Lower privileges permanently */

1434

error_t lower_privileges_permanently(void){

1435

error_t old_errno = errno;

1436

error_t ret_errno = 0;

1437

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

1438

ret_errno = errno;

1439

perror_plus("setuid");

1440

}

1441

errno = old_errno;

1442

return ret_errno;

1443

}

1444

1445

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

1832

__attribute__((nonnull))

1833

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

1446

1834

const float delay){

1447

struct dirent **direntries;

1835

struct dirent **direntries = NULL;

1836

if(hookdir_fd == -1){

1837

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1838

| O_CLOEXEC);

1839

if(hookdir_fd == -1){

1840

if(errno == ENOENT){

1841

if(debug){

1842

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

1843

" found\n", hookdir);

1844

}

1845

} else {

1846

perror_plus("open");

1847

}

1848

return;

1849

}

1850

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

1853

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

1854

runnable_hook, alphasort);

1855

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

1856

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

1857

alphasort);

1858

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

1859

#else /* not __GLIBC__ */

1860

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

1861

alphasort);

1862

#endif /* not __GLIBC__ */

1863

if(numhooks == -1){

1864

perror_plus("scandir");

1865

return;

1866

}

1448

1867

struct dirent *direntry;

1449

1868

int ret;

1450

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

1451

alphasort);

1452

if(numhooks == -1){

1453

if(errno == ENOENT){

1454

if(debug){

1455

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

1456

" found\n", hookdir);

1457

}

1458

} else {

1459

perror_plus("scandir");

1869

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

1870

if(devnull == -1){

1871

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

1872

return;

1873

}

1874

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

1875

direntry = direntries[i];

1876

if(debug){

1877

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

1878

direntry->d_name);

1460

1879

}

1461

} else {

1462

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

1463

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

1464

direntry = direntries[i];

1465

char *fullname = NULL;

1466

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

1467

if(ret < 0){

1880

pid_t hook_pid = fork();

1881

if(hook_pid == 0){

1882

/* Child */

1883

/* Raise privileges */

1884

errno = raise_privileges_permanently();

1885

if(errno != 0){

1886

perror_plus("Failed to raise privileges");

1887

_exit(EX_NOPERM);

1888

}

1889

/* Set group */

1890

errno = 0;

1891

ret = setgid(0);

1892

if(ret == -1){

1893

perror_plus("setgid");

1894

_exit(EX_NOPERM);

1895

}

1896

/* Reset supplementary groups */

1897

errno = 0;

1898

ret = setgroups(0, NULL);

1899

if(ret == -1){

1900

perror_plus("setgroups");

1901

_exit(EX_NOPERM);

1902

}

1903

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

1904

if(ret == -1){

1905

perror_plus("setenv");

1906

_exit(EX_OSERR);

1907

}

1908

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

1909

if(ret == -1){

1910

perror_plus("setenv");

1911

_exit(EX_OSERR);

1912

}

1913

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

1914

if(ret == -1){

1915

perror_plus("setenv");

1916

_exit(EX_OSERR);

1917

}

1918

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

1919

if(ret == -1){

1920

perror_plus("setenv");

1921

_exit(EX_OSERR);

1922

}

1923

char *delaystring;

1924

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

1925

if(ret == -1){

1468

1926

perror_plus("asprintf");

1469

continue;

1470

}

1471

if(debug){

1472

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

1473

direntry->d_name);

1474

}

1475

pid_t hook_pid = fork();

1476

if(hook_pid == 0){

1477

/* Child */

1478

/* Raise privileges */

1479

raise_privileges_permanently();

1480

/* Set group */

1481

errno = 0;

1482

ret = setgid(0);

1483

if(ret == -1){

1484

perror_plus("setgid");

1485

}

1486

/* Reset supplementary groups */

1487

errno = 0;

1488

ret = setgroups(0, NULL);

1489

if(ret == -1){

1490

perror_plus("setgroups");

1491

}

1492

dup2(devnull, STDIN_FILENO);

1493

close(devnull);

1494

dup2(STDERR_FILENO, STDOUT_FILENO);

1495

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

1496

if(ret == -1){

1497

perror_plus("setenv");

1498

_exit(EX_OSERR);

1499

}

1500

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

1501

if(ret == -1){

1502

perror_plus("setenv");

1503

_exit(EX_OSERR);

1504

}

1505

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

1506

if(ret == -1){

1507

perror_plus("setenv");

1508

_exit(EX_OSERR);

1509

}

1510

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

1511

if(ret == -1){

1512

perror_plus("setenv");

1513

_exit(EX_OSERR);

1514

}

1515

char *delaystring;

1516

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

1517

if(ret == -1){

1518

perror_plus("asprintf");

1519

_exit(EX_OSERR);

1520

}

1521

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

1522

if(ret == -1){

1523

free(delaystring);

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1927

_exit(EX_OSERR);

1928

}

1929

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

1930

if(ret == -1){

1527

1931

free(delaystring);

1528

if(connect_to != NULL){

1529

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

1530

if(ret == -1){

1531

perror_plus("setenv");

1532

_exit(EX_OSERR);

1533

}

1534

}

1535

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

1536

perror_plus("execl");

1537

_exit(EXIT_FAILURE);

1538

}

1932

perror_plus("setenv");

1933

_exit(EX_OSERR);

1934

}

1935

free(delaystring);

1936

if(connect_to != NULL){

1937

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

1938

if(ret == -1){

1939

perror_plus("setenv");

1940

_exit(EX_OSERR);

1941

}

1942

}

1943

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

1944

direntry->d_name,

1945

O_RDONLY));

1946

if(hook_fd == -1){

1947

perror_plus("openat");

1948

_exit(EXIT_FAILURE);

1949

}

1950

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

1951

perror_plus("close");

1952

_exit(EXIT_FAILURE);

1953

}

1954

ret = dup2(devnull, STDIN_FILENO);

1955

if(ret == -1){

1956

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

1957

_exit(EX_OSERR);

1958

}

1959

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

1960

if(ret == -1){

1961

perror_plus("close");

1962

_exit(EX_OSERR);

1963

}

1964

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1965

if(ret == -1){

1966

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

1967

_exit(EX_OSERR);

1968

}

1969

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

1970

environ) == -1){

1971

perror_plus("fexecve");

1972

_exit(EXIT_FAILURE);

1973

}

1974

} else {

1975

if(hook_pid == -1){

1976

perror_plus("fork");

1977

free(direntry);

1978

continue;

1979

}

1980

int status;

1981

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

1982

perror_plus("waitpid");

1983

free(direntry);

1984

continue;

1985

}

1986

if(WIFEXITED(status)){

1987

if(WEXITSTATUS(status) != 0){

1988

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

1989

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

1990

WEXITSTATUS(status));

1991

free(direntry);

1992

continue;

1993

}

1994

} else if(WIFSIGNALED(status)){

1995

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

1996

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

1997

WTERMSIG(status));

1998

free(direntry);

1999

continue;

1539

2000

} else {

1540

int status;

1541

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

1542

perror_plus("waitpid");

1543

free(fullname);

1544

continue;

1545

}

1546

if(WIFEXITED(status)){

1547

if(WEXITSTATUS(status) != 0){

1548

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

1549

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

1550

WEXITSTATUS(status));

1551

free(fullname);

1552

continue;

1553

}

1554

} else if(WIFSIGNALED(status)){

1555

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

1556

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

1557

WTERMSIG(status));

1558

free(fullname);

1559

continue;

1560

} else {

1561

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

1562

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

1563

free(fullname);

1564

continue;

1565

}

1566

}

1567

free(fullname);

1568

if(debug){

1569

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

1570

direntry->d_name);

1571

}

1572

}

1573

close(devnull);

1574

}

1575

return true;

2001

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

2002

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

2003

free(direntry);

2004

continue;

2005

}

2006

}

2007

if(debug){

2008

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

2009

direntry->d_name);

2010

}

2011

free(direntry);

2012

}

2013

free(direntries);

2014

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

2015

perror_plus("close");

2016

} else {

2017

hookdir_fd = -1;

2018

}

2019

close(devnull);

1576

2020

}

1577

2021

2022

__attribute__((nonnull, warn_unused_result))

1578

2023

error_t bring_up_interface(const char *const interface,

1579

2024

const float delay){

1580

int sd = -1;

1581

2025

error_t old_errno = errno;

1582

error_t ret_errno = 0;

1583

int ret, ret_setflags;

2026

int ret;

1584

2027

struct ifreq network;

1585

2028

unsigned int if_index = if_nametoindex(interface);

1586

2029

if(if_index == 0){

1595

2038

}

1596

2039

1597

2040

if(not interface_is_up(interface)){

1598

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

2041

error_t ret_errno = 0, ioctl_errno = 0;

2042

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

1599

2043

ret_errno = errno;

1600

2044

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

1601

2045

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

2046

errno = old_errno;

1602

2047

return ret_errno;

1603

2048

}

1604

network.ifr_flags |= IFF_UP;

2049

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

1605

2050

1606

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1607

if(sd < 0){

2051

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

2052

if(sd == -1){

1608

2053

ret_errno = errno;

1609

2054

perror_plus("socket");

1610

2055

errno = old_errno;

1611

2056

return ret_errno;

1612

2057

}

1613

2058

1614

2059

if(quit_now){

1615

close(sd);

2060

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

2061

if(ret == -1){

2062

perror_plus("close");

2063

}

1616

2064

errno = old_errno;

1617

2065

return EINTR;

1618

2066

}

1622

2070

interface);

1623

2071

}

1624

2072

1625

/* Raise priviliges */

1626

raise_privileges();

2073

/* Raise privileges */

2074

ret_errno = raise_privileges();

2075

if(ret_errno != 0){

2076

errno = ret_errno;

2077

perror_plus("Failed to raise privileges");

2078

}

1627

2079

1628

2080

#ifdef __linux__

1629

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1630

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

1631

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

1632

bool restore_loglevel = true;

1633

if(ret_linux == -1){

1634

restore_loglevel = false;

1635

perror_plus("klogctl");

2081

int ret_linux;

2082

bool restore_loglevel = false;

2083

if(ret_errno == 0){

2084

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2085

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

2086

ret_linux = klogctl(8, NULL, 5);

2087

if(ret_linux == -1){

2088

perror_plus("klogctl");

2089

} else {

2090

restore_loglevel = true;

2091

}

1636

2092

}

1637

2093

#endif /* __linux__ */

1638

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

1639

ret_errno = errno;

2094

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

2095

ioctl_errno = errno;

1640

2096

#ifdef __linux__

1641

2097

if(restore_loglevel){

1642

2098

ret_linux = klogctl(7, NULL, 0);

1646

2102

}

1647

2103

#endif /* __linux__ */

1648

2104

1649

/* Lower privileges */

1650

lower_privileges();

2105

/* If raise_privileges() succeeded above */

2106

if(ret_errno == 0){

2107

/* Lower privileges */

2108

ret_errno = lower_privileges();

2109

if(ret_errno != 0){

2110

errno = ret_errno;

2111

perror_plus("Failed to lower privileges");

2112

}

2113

}

1651

2114

1652

2115

/* Close the socket */

1653

2116

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

1656

2119

}

1657

2120

1658

2121

if(ret_setflags == -1){

1659

errno = ret_errno;

2122

errno = ioctl_errno;

1660

2123

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1661

2124

errno = old_errno;

1662

return ret_errno;

2125

return ioctl_errno;

1663

2126

}

1664

2127

} else if(debug){

1665

2128

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

1683

2146

return 0;

1684

2147

}

1685

2148

2149

__attribute__((nonnull, warn_unused_result))

1686

2150

error_t take_down_interface(const char *const interface){

1687

int sd = -1;

1688

2151

error_t old_errno = errno;

1689

error_t ret_errno = 0;

1690

int ret, ret_setflags;

1691

2152

struct ifreq network;

1692

2153

unsigned int if_index = if_nametoindex(interface);

1693

2154

if(if_index == 0){

1696

2157

return ENXIO;

1697

2158

}

1698

2159

if(interface_is_up(interface)){

2160

error_t ret_errno = 0, ioctl_errno = 0;

1699

2161

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

1700

2162

ret_errno = errno;

1701

2163

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

1702

2164

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

2165

errno = old_errno;

1703

2166

return ret_errno;

1704

2167

}

1705

2168

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

1706

2169

1707

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1708

if(sd < 0){

2170

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

2171

if(sd == -1){

1709

2172

ret_errno = errno;

1710

2173

perror_plus("socket");

1711

2174

errno = old_errno;

1717

2180

interface);

1718

2181

}

1719

2182

1720

/* Raise priviliges */

1721

raise_privileges();

1722

1723

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

1724

ret_errno = errno;

1725

1726

/* Lower privileges */

1727

lower_privileges();

2183

/* Raise privileges */

2184

ret_errno = raise_privileges();

2185

if(ret_errno != 0){

2186

errno = ret_errno;

2187

perror_plus("Failed to raise privileges");

2188

}

2189

2190

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

2191

ioctl_errno = errno;

2192

2193

/* If raise_privileges() succeeded above */

2194

if(ret_errno == 0){

2195

/* Lower privileges */

2196

ret_errno = lower_privileges();

2197

if(ret_errno != 0){

2198

errno = ret_errno;

2199

perror_plus("Failed to lower privileges");

2200

}

2201

}

1728

2202

1729

2203

/* Close the socket */

1730

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

2204

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

1731

2205

if(ret == -1){

1732

2206

perror_plus("close");

1733

2207

}

1734

2208

1735

2209

if(ret_setflags == -1){

1736

errno = ret_errno;

2210

errno = ioctl_errno;

1737

2211

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

2212

errno = old_errno;

1739

return ret_errno;

2213

return ioctl_errno;

1740

2214

}

1741

2215

} else if(debug){

1742

2216

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

1748

2222

}

1749

2223

1750

2224

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

2225

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

2226

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

2227

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

2228

.interfaces = NULL, .interfaces_size = 0 };

1751

2229

AvahiSServiceBrowser *sb = NULL;

1752

2230

error_t ret_errno;

1753

2231

int ret;

1754

2232

intmax_t tmpmax;

1755

2233

char *tmp;

1756

2234

int exitcode = EXIT_SUCCESS;

1757

char *interfaces = NULL;

1758

size_t interfaces_size = 0;

1759

2235

char *interfaces_to_take_down = NULL;

1760

2236

size_t interfaces_to_take_down_size = 0;

1761

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

1762

bool tempdir_created = false;

2237

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

2238

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

2239

char *tempdir = NULL;

1763

2240

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1764

2241

const char *seckey = PATHDIR "/" SECKEY;

1765

2242

const char *pubkey = PATHDIR "/" PUBKEY;

1766

2243

char *interfaces_hooks = NULL;

1767

size_t interfaces_hooks_size = 0;

1768

2244

1769

2245

bool gnutls_initialized = false;

1770

2246

bool gpgme_initialized = false;

1861

2337

connect_to = arg;

1862

2338

break;

1863

2339

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

1864

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

1865

(int)',');

2340

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

2341

arg, (int)',');

1866

2342

if(ret_errno != 0){

1867

2343

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

1868

2344

}

1943

2419

goto end;

1944

2420

}

1945

2421

}

1946

2422

1947

2423

{

1948

2424

/* Work around Debian bug #633582:

1949

2425

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

1950

2426

1951

/* Re-raise priviliges */

1952

if(raise_privileges() == 0){

2427

/* Re-raise privileges */

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2431

perror_plus("Failed to raise privileges");

2432

} else {

1953

2433

struct stat st;

1954

2434

1955

2435

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

1972

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

1973

2453

}

1974

2454

}

1975

2455

1976

2456

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

1977

2457

int pubkey_fd = open(pubkey, O_RDONLY);

1978

2458

if(pubkey_fd == -1){

1993

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

1994

2474

}

1995

2475

}

1996

2476

1997

2477

/* Lower privileges */

1998

errno = 0;

1999

ret = seteuid(uid);

2000

if(ret == -1){

2001

perror_plus("seteuid");

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2481

perror_plus("Failed to lower privileges");

2002

2482

}

2003

2483

}

2004

2484

}

2005

2485

2006

/* Remove empty interface names */

2486

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

2007

2487

{

2008

2488

char *interface = NULL;

2009

while((interface = argz_next(interfaces, interfaces_size,

2489

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

2010

2490

interface))){

2011

if(if_nametoindex(interface) == 0){

2012

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

2491

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

2492

and if_nametoindex(interface) == 0){

2493

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

2013

2494

fprintf_plus(stderr, "Not using nonexisting interface"

2014

2495

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

2015

2496

}

2016

argz_delete(&interfaces, &interfaces_size, interface);

2497

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

2017

2498

interface = NULL;

2018

2499

}

2019

2500

}

2021

2502

2022

2503

/* Run network hooks */

2023

2504

{

2024

2025

if(interfaces != NULL){

2026

interfaces_hooks = malloc(interfaces_size);

2505

if(mc.interfaces != NULL){

2506

interfaces_hooks = malloc(mc.interfaces_size);

2027

2507

if(interfaces_hooks == NULL){

2028

2508

perror_plus("malloc");

2029

2509

goto end;

2030

2510

}

2031

memcpy(interfaces_hooks, interfaces, interfaces_size);

2032

interfaces_hooks_size = interfaces_size;

2033

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2034

(int)',');

2035

}

2036

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2037

interfaces_hooks : "", delay)){

2038

goto end;

2039

}

2511

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

2512

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

2513

}

2514

run_network_hooks("start", interfaces_hooks != NULL ?

2515

interfaces_hooks : "", delay);

2040

2516

}

2041

2517

2042

2518

if(not debug){

2047

2523

from the signal handler */

2048

2524

/* Initialize the pseudo-RNG for Avahi */

2049

2525

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

2050

mc.simple_poll = avahi_simple_poll_new();

2051

if(mc.simple_poll == NULL){

2526

simple_poll = avahi_simple_poll_new();

2527

if(simple_poll == NULL){

2052

2528

fprintf_plus(stderr,

2053

2529

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

2054

2530

exitcode = EX_UNAVAILABLE;

2119

2595

}

2120

2596

2121

2597

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

2122

if(interfaces == NULL){

2123

struct dirent **direntries;

2598

if(mc.interfaces == NULL){

2599

struct dirent **direntries = NULL;

2124

2600

/* Look for any good interfaces */

2125

2601

ret = scandir(sys_class_net, &direntries, good_interface,

2126

2602

alphasort);

2127

2603

if(ret >= 1){

2128

2604

/* Add all found interfaces to interfaces list */

2129

2605

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

2130

ret_errno = argz_add(&interfaces, &interfaces_size,

2606

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

2131

2607

direntries[i]->d_name);

2132

2608

if(ret_errno != 0){

2609

errno = ret_errno;

2133

2610

perror_plus("argz_add");

2611

free(direntries[i]);

2134

2612

continue;

2135

2613

}

2136

2614

if(debug){

2137

2615

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

2138

2616

direntries[i]->d_name);

2139

2617

}

2618

free(direntries[i]);

2140

2619

}

2141

2620

free(direntries);

2142

2621

} else {

2143

free(direntries);

2622

if(ret == 0){

2623

free(direntries);

2624

}

2144

2625

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

2145

2626

exitcode = EXIT_FAILURE;

2146

2627

goto end;

2147

2628

}

2148

2629

}

2149

2630

2150

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

2151

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

2152

if(debug){

2153

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

2154

interfaces);

2155

}

2156

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2157

}

2158

2159

/* Bring up interfaces which are down */

2160

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

2161

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

2631

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

2632

{

2162

2633

char *interface = NULL;

2163

while((interface = argz_next(interfaces, interfaces_size,

2634

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

2164

2635

interface))){

2636

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

2637

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

2638

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

2639

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

2640

interface);

2641

interface = NULL;

2642

while((interface = argz_next(mc.interfaces,

2643

mc.interfaces_size, interface))){

2644

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

2645

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

2646

interface);

2647

interface = NULL;

2648

}

2649

}

2650

break;

2651

}

2165

2652

bool interface_was_up = interface_is_up(interface);

2166

ret = bring_up_interface(interface, delay);

2653

errno = bring_up_interface(interface, delay);

2167

2654

if(not interface_was_up){

2168

if(ret != 0){

2169

errno = ret;

2655

if(errno != 0){

2170

2656

perror_plus("Failed to bring up interface");

2171

2657

} else {

2172

ret_errno = argz_add(&interfaces_to_take_down,

2173

&interfaces_to_take_down_size,

2174

interface);

2658

errno = argz_add(&interfaces_to_take_down,

2659

&interfaces_to_take_down_size,

2660

interface);

2661

if(errno != 0){

2662

perror_plus("argz_add");

2663

}

2175

2664

}

2176

2665

}

2177

2666

}

2178

free(interfaces);

2179

interfaces = NULL;

2180

interfaces_size = 0;

2181

2667

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

2182

2668

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

2183

2669

}

2184

2670

}

2185

2671

2672

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

2673

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

2674

if(debug){

2675

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

2676

mc.interfaces);

2677

}

2678

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

2679

}

2680

2186

2681

if(quit_now){

2187

2682

goto end;

2188

2683

}

2189

2684

2190

ret = init_gnutls_global(pubkey, seckey);

2685

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

2191

2686

if(ret == -1){

2192

2687

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

2193

2688

exitcode = EX_UNAVAILABLE;

2200

2695

goto end;

2201

2696

}

2202

2697

2203

if(mkdtemp(tempdir) == NULL){

2698

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

2699

tempdir = mkdtemp(run_tempdir);

2700

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

2701

if(debug){

2702

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

2703

run_tempdir, old_tempdir);

2704

}

2705

tempdir = mkdtemp(old_tempdir);

2706

}

2707

if(tempdir == NULL){

2204

2708

perror_plus("mkdtemp");

2205

2709

goto end;

2206

2710

}

2207

tempdir_created = true;

2208

2711

2209

2712

if(quit_now){

2210

2713

goto end;

2211

2714

}

2212

2715

2213

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

2716

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

2214

2717

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

2215

2718

exitcode = EX_UNAVAILABLE;

2216

2719

goto end;

2246

2749

exitcode = EX_USAGE;

2247

2750

goto end;

2248

2751

}

2249

2752

2250

2753

if(quit_now){

2251

2754

goto end;

2252

2755

}

2273

2776

}

2274

2777

2275

2778

while(not quit_now){

2276

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

2779

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

2780

&mc);

2277

2781

if(quit_now or ret == 0){

2278

2782

break;

2279

2783

}

2281

2785

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

2282

2786

(int)retry_interval);

2283

2787

}

2284

sleep((int)retry_interval);

2788

sleep((unsigned int)retry_interval);

2285

2789

}

2286

2790

2287

if (not quit_now){

2791

if(not quit_now){

2288

2792

exitcode = EXIT_SUCCESS;

2289

2793

}

2290

2794

2305

2809

config.publish_domain = 0;

2306

2810

2307

2811

/* Allocate a new server */

2308

mc.server = avahi_server_new(avahi_simple_poll_get

2309

(mc.simple_poll), &config, NULL,

2310

NULL, &ret_errno);

2812

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2813

&config, NULL, NULL, &ret_errno);

2311

2814

2312

2815

/* Free the Avahi configuration data */

2313

2816

avahi_server_config_free(&config);

2328

2831

/* Create the Avahi service browser */

2329

2832

sb = avahi_s_service_browser_new(mc.server, if_index,

2330

2833

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2331

NULL, 0, browse_callback, NULL);

2834

NULL, 0, browse_callback,

2835

(void *)&mc);

2332

2836

if(sb == NULL){

2333

2837

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

2334

2838

avahi_strerror(avahi_server_errno(mc.server)));

2345

2849

if(debug){

2346

2850

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

2347

2851

}

2348

2349

ret = avahi_loop_with_timeout(mc.simple_poll,

2350

(int)(retry_interval * 1000));

2852

2853

ret = avahi_loop_with_timeout(simple_poll,

2854

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

2351

2855

if(debug){

2352

2856

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

2353

2857

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

2360

2864

}

2361

2865

2362

2866

/* Cleanup things */

2867

free(mc.interfaces);

2868

2363

2869

if(sb != NULL)

2364

2870

avahi_s_service_browser_free(sb);

2365

2871

2366

2872

if(mc.server != NULL)

2367

2873

avahi_server_free(mc.server);

2368

2874

2369

if(mc.simple_poll != NULL)

2370

avahi_simple_poll_free(mc.simple_poll);

2875

if(simple_poll != NULL)

2876

avahi_simple_poll_free(simple_poll);

2371

2877

2372

2878

if(gnutls_initialized){

2373

2879

gnutls_certificate_free_credentials(mc.cred);

2385

2891

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

2386

2892

while(mc.current_server != NULL){

2387

2893

server *next = mc.current_server->next;

2894

#ifdef __GNUC__

2895

#pragma GCC diagnostic push

2896

#pragma GCC diagnostic ignored "-Wcast-qual"

2897

#endif

2898

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

2899

#ifdef __GNUC__

2900

#pragma GCC diagnostic pop

2901

#endif

2388

2902

free(mc.current_server);

2389

2903

mc.current_server = next;

2390

2904

}

2391

2905

}

2392

2906

2393

/* Re-raise priviliges */

2907

/* Re-raise privileges */

2394

2908

{

2395

raise_privileges();

2396

2397

/* Run network hooks */

2398

run_network_hooks("stop", interfaces_hooks != NULL ?

2399

interfaces_hooks : "", delay);

2400

2401

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

2402

{

2403

char *interface = NULL;

2404

while((interface=argz_next(interfaces_to_take_down,

2405

interfaces_to_take_down_size,

2406

interface))){

2407

ret_errno = take_down_interface(interface);

2408

if(ret_errno != 0){

2409

errno = ret_errno;

2410

perror_plus("Failed to take down interface");

2411

}

2412

}

2413

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

2414

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

2415

" down\n");

2416

}

2417

}

2418

2419

lower_privileges_permanently();

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

2912

perror_plus("Failed to raise privileges");

2913

} else {

2914

2915

/* Run network hooks */

2916

run_network_hooks("stop", interfaces_hooks != NULL ?

2917

interfaces_hooks : "", delay);

2918

2919

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

2920

{

2921

char *interface = NULL;

2922

while((interface=argz_next(interfaces_to_take_down,

2923

interfaces_to_take_down_size,

2924

interface))){

2925

ret_errno = take_down_interface(interface);

2926

if(ret_errno != 0){

2927

errno = ret_errno;

2928

perror_plus("Failed to take down interface");

2929

}

2930

}

2931

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

2932

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

2933

" down\n");

2934

}

2935

}

2936

}

2937

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

2941

perror_plus("Failed to lower privileges permanently");

2942

}

2420

2943

}

2421

2944

2422

2945

free(interfaces_to_take_down);

2423

2946

free(interfaces_hooks);

2424

2947

2425

2948

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

2426

if(tempdir_created){

2949

if(tempdir != NULL){

2427

2950

struct dirent **direntries = NULL;

2428

struct dirent *direntry = NULL;

2429

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

2430

alphasort);

2431

if (numentries > 0){

2432

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

2433

direntry = direntries[i];

2434

char *fullname = NULL;

2435

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

2436

direntry->d_name);

2437

if(ret < 0){

2438

perror_plus("asprintf");

2439

continue;

2440

}

2441

ret = remove(fullname);

2442

if(ret == -1){

2443

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

2444

strerror(errno));

2445

}

2446

free(fullname);

2951

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

2952

| O_NOFOLLOW

2953

| O_DIRECTORY

2954

| O_PATH));

2955

if(tempdir_fd == -1){

2956

perror_plus("open");

2957

} else {

2958

#ifdef __GLIBC__

2959

#if __GLIBC_PREREQ(2, 15)

2960

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

2961

notdotentries, alphasort);

2962

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

2963

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

2964

alphasort);

2965

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

2966

#else /* not __GLIBC__ */

2967

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

2968

alphasort);

2969

#endif /* not __GLIBC__ */

2970

if(numentries >= 0){

2971

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

2972

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

2973

if(ret == -1){

2974

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

2975

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

2976

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

2977

}

2978

free(direntries[i]);

2979

}

2980

2981

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

2982

free(direntries);

2983

if(numentries == -1){

2984

perror_plus("scandir");

2985

}

2986

ret = rmdir(tempdir);

2987

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

2988

perror_plus("rmdir");

2989

}

2447

2990

}

2448

}

2449

2450

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

2451

free(direntries);

2452

if (numentries == -1){

2453

perror_plus("scandir");

2454

}

2455

ret = rmdir(tempdir);

2456

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

2457

perror_plus("rmdir");

2991

TEMP_FAILURE_RETRY(close(tempdir_fd));

2458

2992

}

2459

2993

}

2460

2994