/mandos/trunk : revision 599

9

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

10

*

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* Everything else is

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13

12

13

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*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* 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() */

41

42

#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(),

55

opendir(), DIR */

56

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

57

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

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inet_pton(), connect(),

59

getnameinfo() */

60

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

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inet_pton(), connect() */

59

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

61

60

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

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61

*/

63

62

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

73

72

*/

74

73

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

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

76

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

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unlinkat() */

78

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

75

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

76

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

79

77

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

80

78

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

81

79

argp_state, struct argp,

93

91

argz_delete(), argz_append(),

94

92

argz_stringify(), argz_add(),

95

93

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

94

99

95

#ifdef __linux__

100

96

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

142

138

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

143

139

char *connect_to = NULL;

144

140

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

141

uid_t uid = 65534;

147

142

gid_t gid = 65534;

148

143

159

154

160

155

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

161

156

typedef struct {

157

AvahiSimplePoll *simple_poll;

162

158

AvahiServer *server;

163

159

gnutls_certificate_credentials_t cred;

164

160

unsigned int dh_bits;

166

162

const char *priority;

167

163

gpgme_ctx_t ctx;

168

164

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

165

} mandos_context;

172

166

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

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",

171

.current_server = NULL };

175

172

176

173

sig_atomic_t quit_now = 0;

177

174

int signal_received = 0;

185

182

perror(print_text);

186

183

}

187

184

188

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

185

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

189

186

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

190

187

va_list ap;

191

188

va_start (ap, format);

192

189

193

190

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

194

191

program_invocation_short_name));

195

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

192

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

196

193

}

197

194

198

195

/*

200

197

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

201

198

* "buffer_length" is how much is already used.

202

199

*/

203

__attribute__((nonnull, warn_unused_result))

204

200

size_t incbuffer(char **buffer, size_t buffer_length,

205

201

size_t buffer_capacity){

206

202

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

203

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

204

if(buffer == NULL){

213

205

return 0;

214

206

}

215

*buffer = new_buf;

216

207

buffer_capacity += BUFFER_SIZE;

217

208

}

218

209

return buffer_capacity;

219

210

}

220

211

221

212

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

222

__attribute__((nonnull, warn_unused_result))

223

213

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

224

int af, server **current_server){

214

int af){

225

215

int ret;

226

216

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

227

217

if(new_server == NULL){

234

224

.af = af };

235

225

if(new_server->ip == NULL){

236

226

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

227

return false;

253

228

}

254

229

/* Special case of first server */

255

if(*current_server == NULL){

230

if (mc.current_server == NULL){

256

231

new_server->next = new_server;

257

232

new_server->prev = new_server;

258

*current_server = new_server;

233

mc.current_server = new_server;

234

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

259

235

} else {

260

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

261

new_server->next = *current_server;

262

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

236

new_server->next = mc.current_server;

237

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

263

238

new_server->prev->next = new_server;

264

(*current_server)->prev = 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;

265

245

}

266

246

return true;

267

247

}

269

249

/*

270

250

* Initialize GPGME.

271

251

*/

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){

252

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

253

const char *tempdir){

277

254

gpgme_error_t rc;

278

255

gpgme_engine_info_t engine_info;

279

256

257

280

258

/*

281

259

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

282

260

*/

283

bool import_key(const char * const filename){

261

bool import_key(const char *filename){

284

262

int ret;

285

263

int fd;

286

264

gpgme_data_t pgp_data;

298

276

return false;

299

277

}

300

278

301

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

279

rc = gpgme_op_import(mc.ctx, pgp_data);

302

280

if(rc != GPG_ERR_NO_ERROR){

303

281

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

304

282

gpgme_strsource(rc), gpgme_strerror(rc));

348

326

}

349

327

350

328

/* Create new GPGME "context" */

351

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

329

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

352

330

if(rc != GPG_ERR_NO_ERROR){

353

331

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

354

332

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

367

345

* Decrypt OpenPGP data.

368

346

* Returns -1 on error

369

347

*/

370

__attribute__((nonnull, warn_unused_result))

371

348

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

349

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

350

char **plaintext){

375

351

gpgme_data_t dh_crypto, dh_plain;

376

352

gpgme_error_t rc;

377

353

ssize_t ret;

403

379

404

380

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

405

381

data buffer */

406

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

382

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

407

383

if(rc != GPG_ERR_NO_ERROR){

408

384

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

409

385

gpgme_strsource(rc), gpgme_strerror(rc));

410

386

plaintext_length = -1;

411

387

if(debug){

412

388

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

389

result = gpgme_op_decrypt_result(mc.ctx);

414

390

if(result == NULL){

415

391

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

416

392

} else {

493

469

return plaintext_length;

494

470

}

495

471

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

472

static const char * safer_gnutls_strerror(int value){

498

473

const char *ret = gnutls_strerror(value);

499

474

if(ret == NULL)

500

475

ret = "(unknown)";

502

477

}

503

478

504

479

/* GnuTLS log function callback */

505

__attribute__((nonnull))

506

480

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

507

481

const char* string){

508

482

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

509

483

}

510

484

511

__attribute__((nonnull, warn_unused_result))

512

485

static int init_gnutls_global(const char *pubkeyfilename,

513

const char *seckeyfilename,

514

mandos_context *mc){

486

const char *seckeyfilename){

515

487

int ret;

516

488

517

489

if(debug){

534

506

}

535

507

536

508

/* OpenPGP credentials */

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

509

ret = gnutls_certificate_allocate_credentials(&mc.cred);

538

510

if(ret != GNUTLS_E_SUCCESS){

539

511

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

540

512

safer_gnutls_strerror(ret));

550

522

}

551

523

552

524

ret = gnutls_certificate_set_openpgp_key_file

553

(mc->cred, pubkeyfilename, seckeyfilename,

525

(mc.cred, pubkeyfilename, seckeyfilename,

554

526

GNUTLS_OPENPGP_FMT_BASE64);

555

527

if(ret != GNUTLS_E_SUCCESS){

556

528

fprintf_plus(stderr,

562

534

}

563

535

564

536

/* GnuTLS server initialization */

565

ret = gnutls_dh_params_init(&mc->dh_params);

537

ret = gnutls_dh_params_init(&mc.dh_params);

566

538

if(ret != GNUTLS_E_SUCCESS){

567

539

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

568

540

" initialization: %s\n",

569

541

safer_gnutls_strerror(ret));

570

542

goto globalfail;

571

543

}

572

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

544

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

573

545

if(ret != GNUTLS_E_SUCCESS){

574

546

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

575

547

safer_gnutls_strerror(ret));

576

548

goto globalfail;

577

549

}

578

550

579

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

551

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

580

552

581

553

return 0;

582

554

583

555

globalfail:

584

556

585

gnutls_certificate_free_credentials(mc->cred);

557

gnutls_certificate_free_credentials(mc.cred);

586

558

gnutls_global_deinit();

587

gnutls_dh_params_deinit(mc->dh_params);

559

gnutls_dh_params_deinit(mc.dh_params);

588

560

return -1;

589

561

}

590

562

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

563

static int init_gnutls_session(gnutls_session_t *session){

594

564

int ret;

595

565

/* GnuTLS session creation */

596

566

do {

608

578

{

609

579

const char *err;

610

580

do {

611

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

581

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

612

582

if(quit_now){

613

583

gnutls_deinit(*session);

614

584

return -1;

625

595

626

596

do {

627

597

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

628

mc->cred);

598

mc.cred);

629

599

if(quit_now){

630

600

gnutls_deinit(*session);

631

601

return -1;

641

611

/* ignore client certificate if any. */

642

612

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

613

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

614

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

645

615

646

616

return 0;

647

617

}

650

620

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

651

621

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

652

622

653

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

654

__attribute__((warn_unused_result))

655

error_t raise_privileges(void){

656

error_t old_errno = errno;

657

error_t ret_errno = 0;

658

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

659

ret_errno = errno;

660

}

661

errno = old_errno;

662

return ret_errno;

663

}

664

665

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

666

__attribute__((warn_unused_result))

667

error_t raise_privileges_permanently(void){

668

error_t old_errno = errno;

669

error_t ret_errno = raise_privileges();

670

if(ret_errno != 0){

671

errno = old_errno;

672

return ret_errno;

673

}

674

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

675

ret_errno = errno;

676

}

677

errno = old_errno;

678

return ret_errno;

679

}

680

681

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

682

__attribute__((warn_unused_result))

683

error_t lower_privileges(void){

684

error_t old_errno = errno;

685

error_t ret_errno = 0;

686

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

687

ret_errno = errno;

688

}

689

errno = old_errno;

690

return ret_errno;

691

}

692

693

/* Lower privileges permanently */

694

__attribute__((warn_unused_result))

695

error_t lower_privileges_permanently(void){

696

error_t old_errno = errno;

697

error_t ret_errno = 0;

698

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

699

ret_errno = errno;

700

}

701

errno = old_errno;

702

return ret_errno;

703

}

704

705

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

706

__attribute__((nonnull, warn_unused_result))

707

static bool add_remove_local_route(const bool add,

708

const char *address,

709

AvahiIfIndex if_index){

710

int ret;

711

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

712

char add_arg[] = "add";

713

char delete_arg[] = "delete";

714

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

715

if(pluginhelperdir == NULL){

716

if(debug){

717

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

718

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

719

}

720

return false;

721

}

722

723

char interface[IF_NAMESIZE];

724

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

725

perror_plus("if_indextoname");

726

return false;

727

}

728

729

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

730

if(devnull == -1){

731

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

732

return false;

733

}

734

pid_t pid = fork();

735

if(pid == 0){

736

/* Child */

737

/* Raise privileges */

738

errno = raise_privileges_permanently();

739

if(errno != 0){

740

perror_plus("Failed to raise privileges");

741

/* _exit(EX_NOPERM); */

742

} else {

743

/* Set group */

744

errno = 0;

745

ret = setgid(0);

746

if(ret == -1){

747

perror_plus("setgid");

748

_exit(EX_NOPERM);

749

}

750

/* Reset supplementary groups */

751

errno = 0;

752

ret = setgroups(0, NULL);

753

if(ret == -1){

754

perror_plus("setgroups");

755

_exit(EX_NOPERM);

756

}

757

}

758

ret = dup2(devnull, STDIN_FILENO);

759

if(ret == -1){

760

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

761

_exit(EX_OSERR);

762

}

763

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

764

if(ret == -1){

765

perror_plus("close");

766

_exit(EX_OSERR);

767

}

768

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

769

if(ret == -1){

770

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

771

_exit(EX_OSERR);

772

}

773

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

774

O_RDONLY

775

| O_DIRECTORY

776

| O_PATH

777

| O_CLOEXEC));

778

if(helperdir_fd == -1){

779

perror_plus("open");

780

_exit(EX_UNAVAILABLE);

781

}

782

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

783

helper, O_RDONLY));

784

if(helper_fd == -1){

785

perror_plus("openat");

786

_exit(EX_UNAVAILABLE);

787

}

788

TEMP_FAILURE_RETRY(close(helperdir_fd));

789

#ifdef __GNUC__

790

#pragma GCC diagnostic push

791

#pragma GCC diagnostic ignored "-Wcast-qual"

792

#endif

793

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

794

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

795

interface, NULL }, environ) == -1){

796

#ifdef __GNUC__

797

#pragma GCC diagnostic pop

798

#endif

799

perror_plus("fexecve");

800

_exit(EXIT_FAILURE);

801

}

802

}

803

if(pid == -1){

804

perror_plus("fork");

805

return false;

806

}

807

int status;

808

pid_t pret = -1;

809

errno = 0;

810

do {

811

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

812

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

813

int errno_raising = 0;

814

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

815

errno_raising = errno;

816

perror_plus("Failed to raise privileges in order to"

817

" kill helper program");

818

}

819

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

820

perror_plus("kill");

821

}

822

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

823

perror_plus("Failed to lower privileges after killing"

824

" helper program");

825

}

826

return false;

827

}

828

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

829

if(pret == -1){

830

perror_plus("waitpid");

831

return false;

832

}

833

if(WIFEXITED(status)){

834

if(WEXITSTATUS(status) != 0){

835

fprintf_plus(stderr, "Error: iprouteadddel exited"

836

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

837

return false;

838

}

839

return true;

840

}

841

if(WIFSIGNALED(status)){

842

fprintf_plus(stderr, "Error: iprouteadddel died by"

843

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

844

return false;

845

}

846

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

847

return false;

848

}

849

850

__attribute__((nonnull, warn_unused_result))

851

static bool add_local_route(const char *address,

852

AvahiIfIndex if_index){

853

return add_remove_local_route(true, address, if_index);

854

}

855

856

__attribute__((nonnull, warn_unused_result))

857

static bool remove_local_route(const char *address,

858

AvahiIfIndex if_index){

859

return add_remove_local_route(false, address, if_index);

860

}

861

862

623

/* Called when a Mandos server is found */

863

__attribute__((nonnull, warn_unused_result))

864

624

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

865

625

AvahiIfIndex if_index,

866

int af, mandos_context *mc){

626

int af){

867

627

int ret, tcp_sd = -1;

868

628

ssize_t sret;

869

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

870

633

char *buffer = NULL;

871

634

char *decrypted_buffer = NULL;

872

635

size_t buffer_length = 0;

875

638

int retval = -1;

876

639

gnutls_session_t session;

877

640

int pf; /* Protocol family */

878

bool route_added = false;

879

641

880

642

errno = 0;

881

643

897

659

return -1;

898

660

}

899

661

900

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

901

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

902

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

903

bool match = false;

904

{

905

char *interface = NULL;

906

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

907

interface))){

908

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

909

match = true;

910

break;

911

}

912

}

913

}

914

if(not match){

915

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

916

connect to the server */

917

if(debug){

918

char interface[IF_NAMESIZE];

919

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

920

perror_plus("if_indextoname");

921

} else {

922

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

923

" \"%s\"\n",

924

if_indextoname((unsigned int)if_index,

925

interface));

926

}

927

}

928

return -1;

929

}

930

}

931

932

ret = init_gnutls_session(&session, mc);

662

ret = init_gnutls_session(&session);

933

663

if(ret != 0){

934

664

return -1;

935

665

}

939

669

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

940

670

}

941

671

942

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

672

tcp_sd = socket(pf, SOCK_STREAM, 0);

943

673

if(tcp_sd < 0){

944

674

int e = errno;

945

675

perror_plus("socket");

954

684

955

685

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

956

686

if(af == AF_INET6){

957

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

958

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

687

to.in6.sin6_family = (sa_family_t)af;

688

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

959

689

} else { /* IPv4 */

960

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

961

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

690

to.in.sin_family = (sa_family_t)af;

691

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

962

692

}

963

693

if(ret < 0 ){

964

694

int e = errno;

973

703

goto mandos_end;

974

704

}

975

705

if(af == AF_INET6){

976

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

977

if(IN6_IS_ADDR_LINKLOCAL

978

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

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*/

979

710

if(if_index == AVAHI_IF_UNSPEC){

980

711

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

981

712

" incomplete without a network interface\n");

983

714

goto mandos_end;

984

715

}

985

716

/* Set the network interface number as scope */

986

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

717

to.in6.sin6_scope_id = (uint32_t)if_index;

987

718

}

988

719

} else {

989

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

720

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

721

-Wconversion and

722

-Wunreachable-code */

990

723

}

991

724

992

725

if(quit_now){

1009

742

}

1010

743

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1011

744

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1012

if(af == AF_INET6){

1013

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

1014

sizeof(struct sockaddr_in6),

1015

addrstr, sizeof(addrstr), NULL, 0,

1016

NI_NUMERICHOST);

1017

} else {

1018

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

1019

sizeof(struct sockaddr_in),

1020

addrstr, sizeof(addrstr), NULL, 0,

1021

NI_NUMERICHOST);

1022

}

1023

if(ret == EAI_SYSTEM){

1024

perror_plus("getnameinfo");

1025

} else if(ret != 0) {

1026

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

1027

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

1028

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

1029

}

1030

}

1031

1032

if(quit_now){

1033

errno = EINTR;

1034

goto mandos_end;

1035

}

1036

1037

while(true){

1038

if(af == AF_INET6){

1039

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

1040

sizeof(struct sockaddr_in6));

1041

} else {

1042

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

1043

sizeof(struct sockaddr_in));

1044

}

1045

if(ret < 0){

1046

if(errno == ENETUNREACH

1047

and if_index != AVAHI_IF_UNSPEC

1048

and connect_to == NULL

1049

and not route_added and

1050

((af == AF_INET6 and not

1051

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1052

&to)->sin6_addr)))

1053

or (af == AF_INET and

1054

/* Not a a IPv4LL address */

1055

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

1056

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

1057

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

1058

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

1059

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

1060

connect to a Mandos server announced by Avahi on a server

1061

host with a global address. Work around this by retrying

1062

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

1063

1064

Avahi bug reference:

1065

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

1066

https://bugs.debian.org/587961

1067

*/

1068

int e = errno;

1069

route_added = add_local_route(ip, if_index);

1070

if(route_added){

1071

continue;

1072

}

1073

errno = e;

1074

}

1075

if(errno != ECONNREFUSED or debug){

1076

int e = errno;

1077

perror_plus("connect");

1078

errno = e;

1079

}

1080

goto mandos_end;

1081

}

1082

1083

if(quit_now){

1084

errno = EINTR;

1085

goto mandos_end;

1086

}

1087

break;

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;

1088

784

}

1089

785

1090

786

const char *out = mandos_protocol_version;

1241

937

if(buffer_length > 0){

1242

938

ssize_t decrypted_buffer_size;

1243

939

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1244

&decrypted_buffer, mc);

940

&decrypted_buffer);

1245

941

if(decrypted_buffer_size >= 0){

1246

942

1247

943

written = 0;

1273

969

1274

970

mandos_end:

1275

971

{

1276

if(route_added){

1277

if(not remove_local_route(ip, if_index)){

1278

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

1279

" interface %d", ip, if_index);

1280

}

1281

}

1282

972

int e = errno;

1283

973

free(decrypted_buffer);

1284

974

free(buffer);

1301

991

return retval;

1302

992

}

1303

993

1304

__attribute__((nonnull))

1305

994

static void resolve_callback(AvahiSServiceResolver *r,

1306

995

AvahiIfIndex interface,

1307

996

AvahiProtocol proto,

1315

1004

AVAHI_GCC_UNUSED AvahiStringList *txt,

1316

1005

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1317

1006

flags,

1318

void *mc){

1007

AVAHI_GCC_UNUSED void* userdata){

1319

1008

if(r == NULL){

1320

1009

return;

1321

1010

}

1324

1013

timed out */

1325

1014

1326

1015

if(quit_now){

1327

avahi_s_service_resolver_free(r);

1328

1016

return;

1329

1017

}

1330

1018

1334

1022

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

1335

1023

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

1336

1024

domain,

1337

avahi_strerror(avahi_server_errno

1338

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

1025

avahi_strerror(avahi_server_errno(mc.server)));

1339

1026

break;

1340

1027

1341

1028

case AVAHI_RESOLVER_FOUND:

1349

1036

}

1350

1037

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

1351

1038

interface,

1352

avahi_proto_to_af(proto),

1353

mc);

1039

avahi_proto_to_af(proto));

1354

1040

if(ret == 0){

1355

avahi_simple_poll_quit(simple_poll);

1041

avahi_simple_poll_quit(mc.simple_poll);

1356

1042

} else {

1357

1043

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

1358

avahi_proto_to_af(proto),

1359

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

1044

avahi_proto_to_af(proto))){

1360

1045

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

1361

1046

" list\n", name);

1362

1047

}

1375

1060

const char *domain,

1376

1061

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1377

1062

flags,

1378

void *mc){

1063

AVAHI_GCC_UNUSED void* userdata){

1379

1064

if(b == NULL){

1380

1065

return;

1381

1066

}

1392

1077

case AVAHI_BROWSER_FAILURE:

1393

1078

1394

1079

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

1395

avahi_strerror(avahi_server_errno

1396

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

1397

avahi_simple_poll_quit(simple_poll);

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1398

1082

return;

1399

1083

1400

1084

case AVAHI_BROWSER_NEW:

1403

1087

the callback function is called the Avahi server will free the

1404

1088

resolver for us. */

1405

1089

1406

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

1407

interface, protocol, name, type,

1408

domain, protocol, 0,

1409

resolve_callback, mc) == NULL)

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1410

1093

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

1411

1094

" %s\n", name,

1412

avahi_strerror(avahi_server_errno

1413

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

1095

avahi_strerror(avahi_server_errno(mc.server)));

1414

1096

break;

1415

1097

1416

1098

case AVAHI_BROWSER_REMOVE:

1435

1117

signal_received = sig;

1436

1118

int old_errno = errno;

1437

1119

/* set main loop to exit */

1438

if(simple_poll != NULL){

1439

avahi_simple_poll_quit(simple_poll);

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1440

1122

}

1441

1123

errno = old_errno;

1442

1124

}

1443

1125

1444

__attribute__((nonnull, warn_unused_result))

1445

1126

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

1446

1127

int ret;

1447

1128

error_t ret_errno;

1466

1147

return true;

1467

1148

}

1468

1149

1469

__attribute__((nonnull, warn_unused_result))

1470

1150

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

1471

1151

1472

1152

/* Reject the loopback device */

1514

1194

* corresponds to an acceptable network device.

1515

1195

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

1516

1196

*/

1517

__attribute__((nonnull, warn_unused_result))

1518

1197

int good_interface(const struct dirent *if_entry){

1519

1198

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

1520

1199

return 0;

1538

1217

/*

1539

1218

* This function determines if a network interface is up.

1540

1219

*/

1541

__attribute__((nonnull, warn_unused_result))

1542

1220

bool interface_is_up(const char *interface){

1543

1221

struct ifreq ifr;

1544

1222

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

1555

1233

/*

1556

1234

* This function determines if a network interface is running

1557

1235

*/

1558

__attribute__((nonnull, warn_unused_result))

1559

1236

bool interface_is_running(const char *interface){

1560

1237

struct ifreq ifr;

1561

1238

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

1569

1246

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

1570

1247

}

1571

1248

1572

__attribute__((nonnull, pure, warn_unused_result))

1573

1249

int notdotentries(const struct dirent *direntry){

1574

1250

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

1575

1251

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

1582

1258

}

1583

1259

1584

1260

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

1585

__attribute__((nonnull, warn_unused_result))

1586

1261

int runnable_hook(const struct dirent *direntry){

1587

1262

int ret;

1588

1263

size_t sret;

1596

1271

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

1597

1272

"abcdefghijklmnopqrstuvwxyz"

1598

1273

"0123456789"

1599

"_.-");

1274

"_-");

1600

1275

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

1601

1276

/* Contains non-allowed characters */

1602

1277

if(debug){

1606

1281

return 0;

1607

1282

}

1608

1283

1609

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

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);

1610

1292

if(ret == -1){

1611

1293

if(debug){

1612

1294

perror_plus("Could not stat hook");

1636

1318

return 1;

1637

1319

}

1638

1320

1639

__attribute__((nonnull, warn_unused_result))

1640

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1641

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1642

1322

int ret;

1643

1323

struct timespec now;

1644

1324

struct timespec waited_time;

1645

1325

intmax_t block_time;

1646

1326

1647

1327

while(true){

1648

if(mc->current_server == NULL){

1649

if(debug){

1328

if(mc.current_server == NULL){

1329

if (debug){

1650

1330

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

1651

1331

" No timeout!\n");

1652

1332

}

1653

1333

ret = avahi_simple_poll_iterate(s, -1);

1654

1334

} else {

1655

if(debug){

1335

if (debug){

1656

1336

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

1657

1337

" it, or wait\n");

1658

1338

}

1665

1345

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

1666

1346

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

1667

1347

waited_time.tv_sec = (now.tv_sec

1668

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

1348

- mc.current_server->last_seen.tv_sec);

1669

1349

waited_time.tv_nsec = (now.tv_nsec

1670

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

1350

- mc.current_server->last_seen.tv_nsec);

1671

1351

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

1672

1352

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

1673

1353

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

1675

1355

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

1676

1356

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

1677

1357

1678

if(debug){

1358

if (debug){

1679

1359

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

1680

1360

block_time);

1681

1361

}

1682

1362

1683

1363

if(block_time <= 0){

1684

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

1685

mc->current_server->port,

1686

mc->current_server->if_index,

1687

mc->current_server->af, mc);

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);

1688

1368

if(ret == 0){

1689

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1690

1370

return 0;

1691

1371

}

1692

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1693

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1694

1374

if(ret == -1){

1695

1375

perror_plus("clock_gettime");

1696

1376

return -1;

1697

1377

}

1698

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

1378

mc.current_server = mc.current_server->next;

1699

1379

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

1700

1380

servers, but don't block */

1701

1381

}

1703

1383

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

1704

1384

}

1705

1385

if(ret != 0){

1706

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

1386

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

1707

1387

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

1708

1388

}

1709

1389

}

1710

1390

}

1711

1391

}

1712

1392

1713

__attribute__((nonnull))

1714

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

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,

1715

1446

const float delay){

1716

struct dirent **direntries = NULL;

1717

if(hookdir_fd == -1){

1718

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1719

| O_CLOEXEC);

1720

if(hookdir_fd == -1){

1721

if(errno == ENOENT){

1722

if(debug){

1723

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

1724

" found\n", hookdir);

1725

}

1726

} else {

1727

perror_plus("open");

1728

}

1729

return;

1730

}

1731

}

1732

#ifdef __GLIBC__

1733

#if __GLIBC_PREREQ(2, 15)

1734

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

1735

runnable_hook, alphasort);

1736

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

1737

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

1738

alphasort);

1739

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

1740

#else /* not __GLIBC__ */

1741

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

1742

alphasort);

1743

#endif /* not __GLIBC__ */

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1744

1452

if(numhooks == -1){

1745

perror_plus("scandir");

1746

return;

1747

}

1748

struct dirent *direntry;

1749

int ret;

1750

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

1751

if(devnull == -1){

1752

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

1753

return;

1754

}

1755

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

1756

direntry = direntries[i];

1757

if(debug){

1758

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

1759

direntry->d_name);

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");

1760

1460

}

1761

pid_t hook_pid = fork();

1762

if(hook_pid == 0){

1763

/* Child */

1764

/* Raise privileges */

1765

errno = raise_privileges_permanently();

1766

if(errno != 0){

1767

perror_plus("Failed to raise privileges");

1768

_exit(EX_NOPERM);

1769

}

1770

/* Set group */

1771

errno = 0;

1772

ret = setgid(0);

1773

if(ret == -1){

1774

perror_plus("setgid");

1775

_exit(EX_NOPERM);

1776

}

1777

/* Reset supplementary groups */

1778

errno = 0;

1779

ret = setgroups(0, NULL);

1780

if(ret == -1){

1781

perror_plus("setgroups");

1782

_exit(EX_NOPERM);

1783

}

1784

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

1785

if(ret == -1){

1786

perror_plus("setenv");

1787

_exit(EX_OSERR);

1788

}

1789

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

1790

if(ret == -1){

1791

perror_plus("setenv");

1792

_exit(EX_OSERR);

1793

}

1794

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

1795

if(ret == -1){

1796

perror_plus("setenv");

1797

_exit(EX_OSERR);

1798

}

1799

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

1800

if(ret == -1){

1801

perror_plus("setenv");

1802

_exit(EX_OSERR);

1803

}

1804

char *delaystring;

1805

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

1806

if(ret == -1){

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){

1807

1468

perror_plus("asprintf");

1808

_exit(EX_OSERR);

1809

}

1810

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

1811

if(ret == -1){

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

}

1812

1527

free(delaystring);

1813

perror_plus("setenv");

1814

_exit(EX_OSERR);

1815

}

1816

free(delaystring);

1817

if(connect_to != NULL){

1818

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

1819

if(ret == -1){

1820

perror_plus("setenv");

1821

_exit(EX_OSERR);

1822

}

1823

}

1824

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

1825

direntry->d_name,

1826

O_RDONLY));

1827

if(hook_fd == -1){

1828

perror_plus("openat");

1829

_exit(EXIT_FAILURE);

1830

}

1831

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

1832

perror_plus("close");

1833

_exit(EXIT_FAILURE);

1834

}

1835

ret = dup2(devnull, STDIN_FILENO);

1836

if(ret == -1){

1837

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

1838

_exit(EX_OSERR);

1839

}

1840

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

1841

if(ret == -1){

1842

perror_plus("close");

1843

_exit(EX_OSERR);

1844

}

1845

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1846

if(ret == -1){

1847

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

1848

_exit(EX_OSERR);

1849

}

1850

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

1851

environ) == -1){

1852

perror_plus("fexecve");

1853

_exit(EXIT_FAILURE);

1854

}

1855

} else {

1856

if(hook_pid == -1){

1857

perror_plus("fork");

1858

free(direntry);

1859

continue;

1860

}

1861

int status;

1862

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

1863

perror_plus("waitpid");

1864

free(direntry);

1865

continue;

1866

}

1867

if(WIFEXITED(status)){

1868

if(WEXITSTATUS(status) != 0){

1869

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

1870

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

1871

WEXITSTATUS(status));

1872

free(direntry);

1873

continue;

1874

}

1875

} else if(WIFSIGNALED(status)){

1876

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

1877

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

1878

WTERMSIG(status));

1879

free(direntry);

1880

continue;

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

}

1881

1539

} else {

1882

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

1883

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

1884

free(direntry);

1885

continue;

1886

}

1887

}

1888

if(debug){

1889

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

1890

direntry->d_name);

1891

}

1892

free(direntry);

1893

}

1894

free(direntries);

1895

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

1896

perror_plus("close");

1897

} else {

1898

hookdir_fd = -1;

1899

}

1900

close(devnull);

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;

1901

1576

}

1902

1577

1903

__attribute__((nonnull, warn_unused_result))

1904

1578

error_t bring_up_interface(const char *const interface,

1905

1579

const float delay){

1580

int sd = -1;

1906

1581

error_t old_errno = errno;

1907

int ret;

1582

error_t ret_errno = 0;

1583

int ret, ret_setflags;

1908

1584

struct ifreq network;

1909

1585

unsigned int if_index = if_nametoindex(interface);

1910

1586

if(if_index == 0){

1919

1595

}

1920

1596

1921

1597

if(not interface_is_up(interface)){

1922

error_t ret_errno = 0, ioctl_errno = 0;

1923

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

1598

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

1924

1599

ret_errno = errno;

1925

1600

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

1926

1601

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

1927

errno = old_errno;

1928

1602

return ret_errno;

1929

1603

}

1930

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

1604

network.ifr_flags |= IFF_UP;

1931

1605

1932

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

1933

if(sd == -1){

1606

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1607

if(sd < 0){

1934

1608

ret_errno = errno;

1935

1609

perror_plus("socket");

1936

1610

errno = old_errno;

1937

1611

return ret_errno;

1938

1612

}

1939

1613

1940

1614

if(quit_now){

1941

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

1942

if(ret == -1){

1943

perror_plus("close");

1944

}

1615

close(sd);

1945

1616

errno = old_errno;

1946

1617

return EINTR;

1947

1618

}

1951

1622

interface);

1952

1623

}

1953

1624

1954

/* Raise privileges */

1955

ret_errno = raise_privileges();

1956

if(ret_errno != 0){

1957

errno = ret_errno;

1958

perror_plus("Failed to raise privileges");

1959

}

1625

/* Raise priviliges */

1626

raise_privileges();

1960

1627

1961

1628

#ifdef __linux__

1962

int ret_linux;

1963

bool restore_loglevel = false;

1964

if(ret_errno == 0){

1965

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1966

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

1967

ret_linux = klogctl(8, NULL, 5);

1968

if(ret_linux == -1){

1969

perror_plus("klogctl");

1970

} else {

1971

restore_loglevel = true;

1972

}

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");

1973

1636

}

1974

1637

#endif /* __linux__ */

1975

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

1976

ioctl_errno = errno;

1638

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

1639

ret_errno = errno;

1977

1640

#ifdef __linux__

1978

1641

if(restore_loglevel){

1979

1642

ret_linux = klogctl(7, NULL, 0);

1983

1646

}

1984

1647

#endif /* __linux__ */

1985

1648

1986

/* If raise_privileges() succeeded above */

1987

if(ret_errno == 0){

1988

/* Lower privileges */

1989

ret_errno = lower_privileges();

1990

if(ret_errno != 0){

1991

errno = ret_errno;

1992

perror_plus("Failed to lower privileges");

1993

}

1994

}

1649

/* Lower privileges */

1650

lower_privileges();

1995

1651

1996

1652

/* Close the socket */

1997

1653

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

2000

1656

}

2001

1657

2002

1658

if(ret_setflags == -1){

2003

errno = ioctl_errno;

1659

errno = ret_errno;

2004

1660

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2005

1661

errno = old_errno;

2006

return ioctl_errno;

1662

return ret_errno;

2007

1663

}

2008

1664

} else if(debug){

2009

1665

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

2027

1683

return 0;

2028

1684

}

2029

1685

2030

__attribute__((nonnull, warn_unused_result))

2031

1686

error_t take_down_interface(const char *const interface){

1687

int sd = -1;

2032

1688

error_t old_errno = errno;

1689

error_t ret_errno = 0;

1690

int ret, ret_setflags;

2033

1691

struct ifreq network;

2034

1692

unsigned int if_index = if_nametoindex(interface);

2035

1693

if(if_index == 0){

2038

1696

return ENXIO;

2039

1697

}

2040

1698

if(interface_is_up(interface)){

2041

error_t ret_errno = 0, ioctl_errno = 0;

2042

1699

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

2043

1700

ret_errno = errno;

2044

1701

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

2045

1702

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

2046

errno = old_errno;

2047

1703

return ret_errno;

2048

1704

}

2049

1705

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

2050

1706

2051

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

2052

if(sd == -1){

1707

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1708

if(sd < 0){

2053

1709

ret_errno = errno;

2054

1710

perror_plus("socket");

2055

1711

errno = old_errno;

2061

1717

interface);

2062

1718

}

2063

1719

2064

/* Raise privileges */

2065

ret_errno = raise_privileges();

2066

if(ret_errno != 0){

2067

errno = ret_errno;

2068

perror_plus("Failed to raise privileges");

2069

}

2070

2071

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

2072

ioctl_errno = errno;

2073

2074

/* If raise_privileges() succeeded above */

2075

if(ret_errno == 0){

2076

/* Lower privileges */

2077

ret_errno = lower_privileges();

2078

if(ret_errno != 0){

2079

errno = ret_errno;

2080

perror_plus("Failed to lower privileges");

2081

}

2082

}

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();

2083

1728

2084

1729

/* Close the socket */

2085

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

1730

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

2086

1731

if(ret == -1){

2087

1732

perror_plus("close");

2088

1733

}

2089

1734

2090

1735

if(ret_setflags == -1){

2091

errno = ioctl_errno;

1736

errno = ret_errno;

2092

1737

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2093

1738

errno = old_errno;

2094

return ioctl_errno;

1739

return ret_errno;

2095

1740

}

2096

1741

} else if(debug){

2097

1742

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

2103

1748

}

2104

1749

2105

1750

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

2106

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

2107

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

2108

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

2109

.interfaces = NULL, .interfaces_size = 0 };

2110

1751

AvahiSServiceBrowser *sb = NULL;

2111

1752

error_t ret_errno;

2112

1753

int ret;

2113

1754

intmax_t tmpmax;

2114

1755

char *tmp;

2115

1756

int exitcode = EXIT_SUCCESS;

1757

char *interfaces = NULL;

1758

size_t interfaces_size = 0;

2116

1759

char *interfaces_to_take_down = NULL;

2117

1760

size_t interfaces_to_take_down_size = 0;

2118

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

2119

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

2120

char *tempdir = NULL;

1761

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

1762

bool tempdir_created = false;

2121

1763

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2122

1764

const char *seckey = PATHDIR "/" SECKEY;

2123

1765

const char *pubkey = PATHDIR "/" PUBKEY;

2124

1766

char *interfaces_hooks = NULL;

1767

size_t interfaces_hooks_size = 0;

2125

1768

2126

1769

bool gnutls_initialized = false;

2127

1770

bool gpgme_initialized = false;

2218

1861

connect_to = arg;

2219

1862

break;

2220

1863

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

2221

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

2222

arg, (int)',');

1864

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

1865

(int)',');

2223

1866

if(ret_errno != 0){

2224

1867

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

2225

1868

}

2300

1943

goto end;

2301

1944

}

2302

1945

}

2303

1946

2304

1947

{

2305

1948

/* Work around Debian bug #633582:

2306

1949

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

2307

1950

2308

/* Re-raise privileges */

2309

ret_errno = raise_privileges();

2310

if(ret_errno != 0){

2311

errno = ret_errno;

2312

perror_plus("Failed to raise privileges");

2313

} else {

1951

/* Re-raise priviliges */

1952

if(raise_privileges() == 0){

2314

1953

struct stat st;

2315

1954

2316

1955

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

2333

1972

TEMP_FAILURE_RETRY(close(seckey_fd));

2334

1973

}

2335

1974

}

2336

1975

2337

1976

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

2338

1977

int pubkey_fd = open(pubkey, O_RDONLY);

2339

1978

if(pubkey_fd == -1){

2354

1993

TEMP_FAILURE_RETRY(close(pubkey_fd));

2355

1994

}

2356

1995

}

2357

1996

2358

1997

/* Lower privileges */

2359

ret_errno = lower_privileges();

2360

if(ret_errno != 0){

2361

errno = ret_errno;

2362

perror_plus("Failed to lower privileges");

1998

errno = 0;

1999

ret = seteuid(uid);

2000

if(ret == -1){

2001

perror_plus("seteuid");

2363

2002

}

2364

2003

}

2365

2004

}

2366

2005

2367

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

2006

/* Remove empty interface names */

2368

2007

{

2369

2008

char *interface = NULL;

2370

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

2009

while((interface = argz_next(interfaces, interfaces_size,

2371

2010

interface))){

2372

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

2373

and if_nametoindex(interface) == 0){

2374

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

2011

if(if_nametoindex(interface) == 0){

2012

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

2375

2013

fprintf_plus(stderr, "Not using nonexisting interface"

2376

2014

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

2377

2015

}

2378

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

2016

argz_delete(&interfaces, &interfaces_size, interface);

2379

2017

interface = NULL;

2380

2018

}

2381

2019

}

2383

2021

2384

2022

/* Run network hooks */

2385

2023

{

2386

if(mc.interfaces != NULL){

2387

interfaces_hooks = malloc(mc.interfaces_size);

2024

2025

if(interfaces != NULL){

2026

interfaces_hooks = malloc(interfaces_size);

2388

2027

if(interfaces_hooks == NULL){

2389

2028

perror_plus("malloc");

2390

2029

goto end;

2391

2030

}

2392

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

2393

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

2394

}

2395

run_network_hooks("start", interfaces_hooks != NULL ?

2396

interfaces_hooks : "", delay);

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

}

2397

2040

}

2398

2041

2399

2042

if(not debug){

2404

2047

from the signal handler */

2405

2048

/* Initialize the pseudo-RNG for Avahi */

2406

2049

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

2407

simple_poll = avahi_simple_poll_new();

2408

if(simple_poll == NULL){

2050

mc.simple_poll = avahi_simple_poll_new();

2051

if(mc.simple_poll == NULL){

2409

2052

fprintf_plus(stderr,

2410

2053

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

2411

2054

exitcode = EX_UNAVAILABLE;

2476

2119

}

2477

2120

2478

2121

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

2479

if(mc.interfaces == NULL){

2480

struct dirent **direntries = NULL;

2122

if(interfaces == NULL){

2123

struct dirent **direntries;

2481

2124

/* Look for any good interfaces */

2482

2125

ret = scandir(sys_class_net, &direntries, good_interface,

2483

2126

alphasort);

2484

2127

if(ret >= 1){

2485

2128

/* Add all found interfaces to interfaces list */

2486

2129

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

2487

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

2130

ret_errno = argz_add(&interfaces, &interfaces_size,

2488

2131

direntries[i]->d_name);

2489

2132

if(ret_errno != 0){

2490

errno = ret_errno;

2491

2133

perror_plus("argz_add");

2492

free(direntries[i]);

2493

2134

continue;

2494

2135

}

2495

2136

if(debug){

2496

2137

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

2497

2138

direntries[i]->d_name);

2498

2139

}

2499

free(direntries[i]);

2500

2140

}

2501

2141

free(direntries);

2502

2142

} else {

2503

if(ret == 0){

2504

free(direntries);

2505

}

2143

free(direntries);

2506

2144

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

2507

2145

exitcode = EXIT_FAILURE;

2508

2146

goto end;

2509

2147

}

2510

2148

}

2511

2149

2512

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

2513

{

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)){

2514

2162

char *interface = NULL;

2515

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

2163

while((interface = argz_next(interfaces, interfaces_size,

2516

2164

interface))){

2517

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

2518

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

2519

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

2520

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

2521

interface);

2522

interface = NULL;

2523

while((interface = argz_next(mc.interfaces,

2524

mc.interfaces_size, interface))){

2525

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

2526

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

2527

interface);

2528

interface = NULL;

2529

}

2530

}

2531

break;

2532

}

2533

2165

bool interface_was_up = interface_is_up(interface);

2534

errno = bring_up_interface(interface, delay);

2166

ret = bring_up_interface(interface, delay);

2535

2167

if(not interface_was_up){

2536

if(errno != 0){

2168

if(ret != 0){

2169

errno = ret;

2537

2170

perror_plus("Failed to bring up interface");

2538

2171

} else {

2539

errno = argz_add(&interfaces_to_take_down,

2540

&interfaces_to_take_down_size,

2541

interface);

2542

if(errno != 0){

2543

perror_plus("argz_add");

2544

}

2172

ret_errno = argz_add(&interfaces_to_take_down,

2173

&interfaces_to_take_down_size,

2174

interface);

2545

2175

}

2546

2176

}

2547

2177

}

2178

free(interfaces);

2179

interfaces = NULL;

2180

interfaces_size = 0;

2548

2181

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

2549

2182

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

2550

2183

}

2551

2184

}

2552

2185

2553

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

2554

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

2555

if(debug){

2556

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

2557

mc.interfaces);

2558

}

2559

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

2560

}

2561

2562

2186

if(quit_now){

2563

2187

goto end;

2564

2188

}

2565

2189

2566

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

2190

ret = init_gnutls_global(pubkey, seckey);

2567

2191

if(ret == -1){

2568

2192

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

2569

2193

exitcode = EX_UNAVAILABLE;

2576

2200

goto end;

2577

2201

}

2578

2202

2579

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

2580

tempdir = mkdtemp(run_tempdir);

2581

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

2582

if(debug){

2583

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

2584

run_tempdir, old_tempdir);

2585

}

2586

tempdir = mkdtemp(old_tempdir);

2587

}

2588

if(tempdir == NULL){

2203

if(mkdtemp(tempdir) == NULL){

2589

2204

perror_plus("mkdtemp");

2590

2205

goto end;

2591

2206

}

2207

tempdir_created = true;

2592

2208

2593

2209

if(quit_now){

2594

2210

goto end;

2595

2211

}

2596

2212

2597

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

2213

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

2598

2214

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

2599

2215

exitcode = EX_UNAVAILABLE;

2600

2216

goto end;

2630

2246

exitcode = EX_USAGE;

2631

2247

goto end;

2632

2248

}

2633

2249

2634

2250

if(quit_now){

2635

2251

goto end;

2636

2252

}

2657

2273

}

2658

2274

2659

2275

while(not quit_now){

2660

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

2661

&mc);

2276

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

2662

2277

if(quit_now or ret == 0){

2663

2278

break;

2664

2279

}

2666

2281

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

2667

2282

(int)retry_interval);

2668

2283

}

2669

sleep((unsigned int)retry_interval);

2284

sleep((int)retry_interval);

2670

2285

}

2671

2286

2672

if(not quit_now){

2287

if (not quit_now){

2673

2288

exitcode = EXIT_SUCCESS;

2674

2289

}

2675

2290

2690

2305

config.publish_domain = 0;

2691

2306

2692

2307

/* Allocate a new server */

2693

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2694

&config, NULL, NULL, &ret_errno);

2308

mc.server = avahi_server_new(avahi_simple_poll_get

2309

(mc.simple_poll), &config, NULL,

2310

NULL, &ret_errno);

2695

2311

2696

2312

/* Free the Avahi configuration data */

2697

2313

avahi_server_config_free(&config);

2712

2328

/* Create the Avahi service browser */

2713

2329

sb = avahi_s_service_browser_new(mc.server, if_index,

2714

2330

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2715

NULL, 0, browse_callback,

2716

(void *)&mc);

2331

NULL, 0, browse_callback, NULL);

2717

2332

if(sb == NULL){

2718

2333

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

2719

2334

avahi_strerror(avahi_server_errno(mc.server)));

2730

2345

if(debug){

2731

2346

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

2732

2347

}

2733

2734

ret = avahi_loop_with_timeout(simple_poll,

2735

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

2348

2349

ret = avahi_loop_with_timeout(mc.simple_poll,

2350

(int)(retry_interval * 1000));

2736

2351

if(debug){

2737

2352

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

2738

2353

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

2745

2360

}

2746

2361

2747

2362

/* Cleanup things */

2748

free(mc.interfaces);

2749

2750

2363

if(sb != NULL)

2751

2364

avahi_s_service_browser_free(sb);

2752

2365

2753

2366

if(mc.server != NULL)

2754

2367

avahi_server_free(mc.server);

2755

2368

2756

if(simple_poll != NULL)

2757

avahi_simple_poll_free(simple_poll);

2369

if(mc.simple_poll != NULL)

2370

avahi_simple_poll_free(mc.simple_poll);

2758

2371

2759

2372

if(gnutls_initialized){

2760

2373

gnutls_certificate_free_credentials(mc.cred);

2772

2385

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

2773

2386

while(mc.current_server != NULL){

2774

2387

server *next = mc.current_server->next;

2775

#ifdef __GNUC__

2776

#pragma GCC diagnostic push

2777

#pragma GCC diagnostic ignored "-Wcast-qual"

2778

#endif

2779

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

2780

#ifdef __GNUC__

2781

#pragma GCC diagnostic pop

2782

#endif

2783

2388

free(mc.current_server);

2784

2389

mc.current_server = next;

2785

2390

}

2786

2391

}

2787

2392

2788

/* Re-raise privileges */

2393

/* Re-raise priviliges */

2789

2394

{

2790

ret_errno = raise_privileges();

2791

if(ret_errno != 0){

2792

errno = ret_errno;

2793

perror_plus("Failed to raise privileges");

2794

} else {

2795

2796

/* Run network hooks */

2797

run_network_hooks("stop", interfaces_hooks != NULL ?

2798

interfaces_hooks : "", delay);

2799

2800

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

2801

{

2802

char *interface = NULL;

2803

while((interface=argz_next(interfaces_to_take_down,

2804

interfaces_to_take_down_size,

2805

interface))){

2806

ret_errno = take_down_interface(interface);

2807

if(ret_errno != 0){

2808

errno = ret_errno;

2809

perror_plus("Failed to take down interface");

2810

}

2811

}

2812

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

2813

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

2814

" down\n");

2815

}

2816

}

2817

}

2818

2819

ret_errno = lower_privileges_permanently();

2820

if(ret_errno != 0){

2821

errno = ret_errno;

2822

perror_plus("Failed to lower privileges permanently");

2823

}

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();

2824

2420

}

2825

2421

2826

2422

free(interfaces_to_take_down);

2827

2423

free(interfaces_hooks);

2828

2424

2829

2425

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

2830

if(tempdir != NULL){

2426

if(tempdir_created){

2831

2427

struct dirent **direntries = NULL;

2832

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

2833

| O_NOFOLLOW

2834

| O_DIRECTORY

2835

| O_PATH));

2836

if(tempdir_fd == -1){

2837

perror_plus("open");

2838

} else {

2839

#ifdef __GLIBC__

2840

#if __GLIBC_PREREQ(2, 15)

2841

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

2842

notdotentries, alphasort);

2843

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

2844

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

2845

alphasort);

2846

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

2847

#else /* not __GLIBC__ */

2848

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

2849

alphasort);

2850

#endif /* not __GLIBC__ */

2851

if(numentries >= 0){

2852

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

2853

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

2854

if(ret == -1){

2855

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

2856

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

2857

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

2858

}

2859

free(direntries[i]);

2860

}

2861

2862

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

2863

free(direntries);

2864

if(numentries == -1){

2865

perror_plus("scandir");

2866

}

2867

ret = rmdir(tempdir);

2868

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

2869

perror_plus("rmdir");

2870

}

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);

2871

2447

}

2872

TEMP_FAILURE_RETRY(close(tempdir_fd));

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");

2873

2458

}

2874

2459

}

2875

2460