/mandos/trunk : revision 299

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

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33

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

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34

#define _FILE_OFFSET_BITS 64

38

#endif

39

35

40

36

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

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37

42

38

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

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stdout, ferror(), remove() */

39

stdout, ferror(), sscanf(),

40

remove() */

44

41

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

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42

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

46

43

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

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srand(), strtof() */

48

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

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srand() */

45

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

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46

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

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47

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

51

#include <sys/ioctl.h> /* ioctl */

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#include <sys/ioctl.h> /* ioctl */

52

49

#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, uid_t, gid_t, open(),

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opendir(), DIR */

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SOCK_STREAM, INET6_ADDRSTRLEN,

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uid_t, gid_t, open(), opendir(),

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DIR */

56

54

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

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55

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

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inet_pton(), connect() */

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struct in6_addr, inet_pton(),

57

connect() */

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

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

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60

*/

62

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

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strtoimax() */

61

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

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62

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

65

63

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

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64

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

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65

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

68

66

SIOCSIFFLAGS, if_indextoname(),

69

67

if_nametoindex(), IF_NAMESIZE */

70

#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

68

#include <netinet/in.h>

73

69

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

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getuid(), getgid(), setuid(),

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setgid() */

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

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

73

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

78

74

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

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75

argp_state, struct argp,

80

76

argp_parse(), ARGP_KEY_ARG,

81

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

#include <signal.h> /* sigemptyset(), sigaddset(),

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

85

86

78

#ifdef __linux__

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79

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

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#endif /* __linux__ */

80

#endif

89

81

90

82

/* Avahi */

91

83

/* All Avahi types, constants and functions

137

129

gpgme_ctx_t ctx;

138

130

} mandos_context;

139

131

140

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

141

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

142

.dh_bits = 1024, .priority = "SECURE256"

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":!CTYPE-X.509:+CTYPE-OPENPGP" };

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145

132

/*

146

* Make additional room in "buffer" for at least BUFFER_SIZE more

147

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

133

* Make room in "buffer" for at least BUFFER_SIZE additional bytes.

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* "buffer_capacity" is how much is currently allocated,

148

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* "buffer_length" is how much is already used.

149

136

*/

150

size_t incbuffer(char **buffer, size_t buffer_length,

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

151

138

size_t buffer_capacity){

152

139

if(buffer_length + BUFFER_SIZE > buffer_capacity){

153

140

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

162

149

/*

163

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* Initialize GPGME.

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151

*/

165

static bool init_gpgme(const char *seckey,

152

static bool init_gpgme(mandos_context *mc, const char *seckey,

166

153

const char *pubkey, const char *tempdir){

167

154

int ret;

168

155

gpgme_error_t rc;

189

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return false;

190

177

}

191

178

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rc = gpgme_op_import(mc.ctx, pgp_data);

179

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

193

180

if(rc != GPG_ERR_NO_ERROR){

194

181

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

195

182

gpgme_strsource(rc), gpgme_strerror(rc));

205

192

}

206

193

207

194

if(debug){

208

fprintf(stderr, "Initializing GPGME\n");

195

fprintf(stderr, "Initialize gpgme\n");

209

196

}

210

197

211

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/* Init GPGME */

238

225

}

239

226

240

227

/* Create new GPGME "context" */

241

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

228

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

242

229

if(rc != GPG_ERR_NO_ERROR){

243

230

fprintf(stderr, "bad gpgme_new: %s: %s\n",

244

231

gpgme_strsource(rc), gpgme_strerror(rc));

256

243

* Decrypt OpenPGP data.

257

244

* Returns -1 on error

258

245

*/

259

static ssize_t pgp_packet_decrypt(const char *cryptotext,

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

260

248

size_t crypto_size,

261

249

char **plaintext){

262

250

gpgme_data_t dh_crypto, dh_plain;

289

277

290

278

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

291

279

data buffer */

292

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

280

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

293

281

if(rc != GPG_ERR_NO_ERROR){

294

282

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

295

283

gpgme_strsource(rc), gpgme_strerror(rc));

296

284

plaintext_length = -1;

297

285

if(debug){

298

286

gpgme_decrypt_result_t result;

299

result = gpgme_op_decrypt_result(mc.ctx);

287

result = gpgme_op_decrypt_result(mc->ctx);

300

288

if(result == NULL){

301

289

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

302

290

} else {

338

326

339

327

*plaintext = NULL;

340

328

while(true){

341

plaintext_capacity = incbuffer(plaintext,

329

plaintext_capacity = adjustbuffer(plaintext,

342

330

(size_t)plaintext_length,

343

331

plaintext_capacity);

344

332

if(plaintext_capacity == 0){

345

perror("incbuffer");

333

perror("adjustbuffer");

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334

plaintext_length = -1;

347

335

goto decrypt_end;

348

336

}

394

382

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

395

383

}

396

384

397

static int init_gnutls_global(const char *pubkeyfilename,

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

398

387

const char *seckeyfilename){

399

388

int ret;

400

389

418

407

}

419

408

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/* OpenPGP credentials */

421

gnutls_certificate_allocate_credentials(&mc.cred);

410

gnutls_certificate_allocate_credentials(&mc->cred);

422

411

if(ret != GNUTLS_E_SUCCESS){

423

412

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

424

from

425

-Wunreachable-code

426

*/

413

* from

414

* -Wunreachable-code

415

*/

427

416

safer_gnutls_strerror(ret));

428

417

gnutls_global_deinit();

429

418

return -1;

436

425

}

437

426

438

427

ret = gnutls_certificate_set_openpgp_key_file

439

(mc.cred, pubkeyfilename, seckeyfilename,

428

(mc->cred, pubkeyfilename, seckeyfilename,

440

429

GNUTLS_OPENPGP_FMT_BASE64);

441

430

if(ret != GNUTLS_E_SUCCESS){

442

431

fprintf(stderr,

448

437

}

449

438

450

439

/* GnuTLS server initialization */

451

ret = gnutls_dh_params_init(&mc.dh_params);

440

ret = gnutls_dh_params_init(&mc->dh_params);

452

441

if(ret != GNUTLS_E_SUCCESS){

453

442

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

454

443

" %s\n", safer_gnutls_strerror(ret));

455

444

goto globalfail;

456

445

}

457

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

446

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

458

447

if(ret != GNUTLS_E_SUCCESS){

459

448

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

460

449

safer_gnutls_strerror(ret));

461

450

goto globalfail;

462

451

}

463

452

464

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

453

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

465

454

466

455

return 0;

467

456

468

457

globalfail:

469

458

470

gnutls_certificate_free_credentials(mc.cred);

459

gnutls_certificate_free_credentials(mc->cred);

471

460

gnutls_global_deinit();

472

gnutls_dh_params_deinit(mc.dh_params);

461

gnutls_dh_params_deinit(mc->dh_params);

473

462

return -1;

474

463

}

475

464

476

static int init_gnutls_session(gnutls_session_t *session){

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

477

467

int ret;

478

468

/* GnuTLS session creation */

479

469

ret = gnutls_init(session, GNUTLS_SERVER);

484

474

485

475

{

486

476

const char *err;

487

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

477

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

488

478

if(ret != GNUTLS_E_SUCCESS){

489

479

fprintf(stderr, "Syntax error at: %s\n", err);

490

480

fprintf(stderr, "GnuTLS error: %s\n",

495

485

}

496

486

497

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

488

mc->cred);

499

489

if(ret != GNUTLS_E_SUCCESS){

500

490

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

501

491

safer_gnutls_strerror(ret));

507

497

gnutls_certificate_server_set_request(*session,

508

498

GNUTLS_CERT_IGNORE);

509

499

510

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

511

501

512

502

return 0;

513

503

}

519

509

/* Called when a Mandos server is found */

520

510

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

521

511

AvahiIfIndex if_index,

522

int af){

512

mandos_context *mc){

523

513

int ret, tcp_sd;

524

514

ssize_t sret;

525

union {

526

struct sockaddr_in in;

527

struct sockaddr_in6 in6;

528

} to;

515

union { struct sockaddr in; struct sockaddr_in6 in6; } to;

529

516

char *buffer = NULL;

530

517

char *decrypted_buffer;

531

518

size_t buffer_length = 0;

533

520

ssize_t decrypted_buffer_size;

534

521

size_t written;

535

522

int retval = 0;

523

char interface[IF_NAMESIZE];

536

524

gnutls_session_t session;

537

int pf; /* Protocol family */

538

539

switch(af){

540

case AF_INET6:

541

pf = PF_INET6;

542

break;

543

case AF_INET:

544

pf = PF_INET;

545

break;

546

default:

547

fprintf(stderr, "Bad address family: %d\n", af);

548

return -1;

549

}

550

551

ret = init_gnutls_session(&session);

525

526

ret = init_gnutls_session(mc, &session);

552

527

if(ret != 0){

553

528

return -1;

554

529

}

555

530

556

531

if(debug){

557

fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16

532

fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16

558

533

"\n", ip, port);

559

534

}

560

535

561

tcp_sd = socket(pf, SOCK_STREAM, 0);

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

562

537

if(tcp_sd < 0){

563

538

perror("socket");

564

539

return -1;

565

540

}

566

541

542

if(debug){

543

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

544

perror("if_indextoname");

545

return -1;

546

}

547

fprintf(stderr, "Binding to interface %s\n", interface);

548

}

549

567

550

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

568

if(af == AF_INET6){

569

to.in6.sin6_family = (sa_family_t)af;

570

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

571

} else { /* IPv4 */

572

to.in.sin_family = (sa_family_t)af;

573

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

574

}

551

to.in6.sin6_family = AF_INET6;

552

/* It would be nice to have a way to detect if we were passed an

553

IPv4 address here. Now we assume an IPv6 address. */

554

ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);

575

555

if(ret < 0 ){

576

556

perror("inet_pton");

577

557

return -1;

580

560

fprintf(stderr, "Bad address: %s\n", ip);

581

561

return -1;

582

562

}

583

if(af == AF_INET6){

584

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

585

-Wconversion and

586

-Wunreachable-code */

587

588

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

589

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

590

-Wunreachable-code*/

591

if(if_index == AVAHI_IF_UNSPEC){

592

fprintf(stderr, "An IPv6 link-local address is incomplete"

593

" without a network interface\n");

594

return -1;

595

}

596

/* Set the network interface number as scope */

597

to.in6.sin6_scope_id = (uint32_t)if_index;

598

}

599

} else {

600

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

563

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

601

564

-Wconversion and

602

565

-Wunreachable-code */

603

}

566

567

to.in6.sin6_scope_id = (uint32_t)if_index;

604

568

605

569

if(debug){

606

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

607

char interface[IF_NAMESIZE];

608

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

609

perror("if_indextoname");

610

} else {

611

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

612

ip, interface, port);

613

}

614

} else {

615

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

616

port);

617

}

618

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

619

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

620

const char *pcret;

621

if(af == AF_INET6){

622

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

623

sizeof(addrstr));

624

} else {

625

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

626

sizeof(addrstr));

627

}

628

if(pcret == NULL){

570

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

571

port);

572

char addrstr[INET6_ADDRSTRLEN] = "";

573

if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,

574

sizeof(addrstr)) == NULL){

629

575

perror("inet_ntop");

630

576

} else {

631

577

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

634

580

}

635

581

}

636

582

637

if(af == AF_INET6){

638

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

639

} else {

640

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

641

}

583

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

642

584

if(ret < 0){

643

585

perror("connect");

644

586

return -1;

690

632

/* Read OpenPGP packet that contains the wanted password */

691

633

692

634

if(debug){

693

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

635

fprintf(stderr, "Retrieving pgp encrypted password from %s\n",

694

636

ip);

695

637

}

696

638

697

639

while(true){

698

buffer_capacity = incbuffer(&buffer, buffer_length,

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

699

641

buffer_capacity);

700

642

if(buffer_capacity == 0){

701

perror("incbuffer");

643

perror("adjustbuffer");

702

644

retval = -1;

703

645

goto mandos_end;

704

646

}

743

685

gnutls_bye(session, GNUTLS_SHUT_RDWR);

744

686

745

687

if(buffer_length > 0){

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

747

689

buffer_length,

748

690

&decrypted_buffer);

749

691

if(decrypted_buffer_size >= 0){

784

726

785

727

static void resolve_callback(AvahiSServiceResolver *r,

786

728

AvahiIfIndex interface,

787

AvahiProtocol proto,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

788

730

AvahiResolverEvent event,

789

731

const char *name,

790

732

const char *type,

795

737

AVAHI_GCC_UNUSED AvahiStringList *txt,

796

738

AVAHI_GCC_UNUSED AvahiLookupResultFlags

797

739

flags,

798

AVAHI_GCC_UNUSED void* userdata){

740

void* userdata){

741

mandos_context *mc = userdata;

799

742

assert(r);

800

743

801

744

/* Called whenever a service has been resolved successfully or

806

749

case AVAHI_RESOLVER_FAILURE:

807

750

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

808

751

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

809

avahi_strerror(avahi_server_errno(mc.server)));

752

avahi_strerror(avahi_server_errno(mc->server)));

810

753

break;

811

754

812

755

case AVAHI_RESOLVER_FOUND:

818

761

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

819

762

ip, (intmax_t)interface, port);

820

763

}

821

int ret = start_mandos_communication(ip, port, interface,

822

avahi_proto_to_af(proto));

764

int ret = start_mandos_communication(ip, port, interface, mc);

823

765

if(ret == 0){

824

avahi_simple_poll_quit(mc.simple_poll);

766

avahi_simple_poll_quit(mc->simple_poll);

825

767

}

826

768

}

827

769

}

837

779

const char *domain,

838

780

AVAHI_GCC_UNUSED AvahiLookupResultFlags

839

781

flags,

840

AVAHI_GCC_UNUSED void* userdata){

782

void* userdata){

783

mandos_context *mc = userdata;

841

784

assert(b);

842

785

843

786

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

848

791

case AVAHI_BROWSER_FAILURE:

849

792

850

793

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

851

avahi_strerror(avahi_server_errno(mc.server)));

852

avahi_simple_poll_quit(mc.simple_poll);

794

avahi_strerror(avahi_server_errno(mc->server)));

795

avahi_simple_poll_quit(mc->simple_poll);

853

796

return;

854

797

855

798

case AVAHI_BROWSER_NEW:

858

801

the callback function is called the Avahi server will free the

859

802

resolver for us. */

860

803

861

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

862

name, type, domain, protocol, 0,

863

resolve_callback, NULL) == NULL)

804

if(!(avahi_s_service_resolver_new(mc->server, interface,

805

protocol, name, type, domain,

806

AVAHI_PROTO_INET6, 0,

807

resolve_callback, mc)))

864

808

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

865

name, avahi_strerror(avahi_server_errno(mc.server)));

809

name, avahi_strerror(avahi_server_errno(mc->server)));

866

810

break;

867

811

868

812

case AVAHI_BROWSER_REMOVE:

877

821

}

878

822

}

879

823

880

sig_atomic_t quit_now = 0;

881

882

/* stop main loop after sigterm has been called */

883

static void handle_sigterm(__attribute__((unused)) int sig){

884

if(quit_now){

885

return;

886

}

887

quit_now = 1;

888

int old_errno = errno;

889

if(mc.simple_poll != NULL){

890

avahi_simple_poll_quit(mc.simple_poll);

891

}

892

errno = old_errno;

893

}

894

895

824

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

896

825

AvahiSServiceBrowser *sb = NULL;

897

826

int error;

898

827

int ret;

899

828

intmax_t tmpmax;

900

char *tmp;

829

int numchars;

901

830

int exitcode = EXIT_SUCCESS;

902

831

const char *interface = "eth0";

903

832

struct ifreq network;

911

840

const char *seckey = PATHDIR "/" SECKEY;

912

841

const char *pubkey = PATHDIR "/" PUBKEY;

913

842

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

":!CTYPE-X.509:+CTYPE-OPENPGP" };

914

846

bool gnutls_initialized = false;

915

847

bool gpgme_initialized = false;

916

float delay = 2.5f;

917

918

struct sigaction old_sigterm_action;

919

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

848

double delay = 2.5;

920

849

921

850

{

922

851

struct argp_option options[] = {

928

857

.group = 1 },

929

858

{ .name = "interface", .key = 'i',

930

859

.arg = "NAME",

931

.doc = "Network interface that will be used to search for"

932

" Mandos servers",

860

.doc = "Interface that will be used to search for Mandos"

861

" servers",

933

862

.group = 1 },

934

863

{ .name = "seckey", .key = 's',

935

864

.arg = "FILE",

974

903

pubkey = arg;

975

904

break;

976

905

case 129: /* --dh-bits */

977

errno = 0;

978

tmpmax = strtoimax(arg, &tmp, 10);

979

if(errno != 0 or tmp == arg or *tmp != '\0'

980

or tmpmax != (typeof(mc.dh_bits))tmpmax){

906

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

907

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

908

or arg[numchars] != '\0'){

981

909

fprintf(stderr, "Bad number of DH bits\n");

982

910

exit(EXIT_FAILURE);

983

911

}

987

915

mc.priority = arg;

988

916

break;

989

917

case 131: /* --delay */

990

errno = 0;

991

delay = strtof(arg, &tmp);

992

if(errno != 0 or tmp == arg or *tmp != '\0'){

918

ret = sscanf(arg, "%lf%n", &delay, &numchars);

919

if(ret < 1 or arg[numchars] != '\0'){

993

920

fprintf(stderr, "Bad delay\n");

994

921

exit(EXIT_FAILURE);

995

922

}

1016

943

}

1017

944

}

1018

945

1019

if(not debug){

1020

avahi_set_log_function(empty_log);

1021

}

1022

1023

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

1024

from the signal handler */

1025

/* Initialize the pseudo-RNG for Avahi */

1026

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

1027

mc.simple_poll = avahi_simple_poll_new();

1028

if(mc.simple_poll == NULL){

1029

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1030

exitcode = EXIT_FAILURE;

1031

goto end;

1032

}

1033

1034

sigemptyset(&sigterm_action.sa_mask);

1035

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1036

if(ret == -1){

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1039

goto end;

1040

}

1041

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1042

if(ret == -1){

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1045

goto end;

1046

}

1047

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1048

if(ret == -1){

1049

perror("sigaddset");

1050

exitcode = EXIT_FAILURE;

1051

goto end;

1052

}

1053

ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

1059

1060

946

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

1061

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

947

{

1062

948

#ifdef __linux__

1063

949

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

950

messages to mess up the prompt */

1065

951

ret = klogctl(8, NULL, 5);

1066

bool restore_loglevel = true;

1067

952

if(ret == -1){

1068

restore_loglevel = false;

1069

953

perror("klogctl");

1070

954

}

1071

#endif /* __linux__ */

955

#endif

1072

956

1073

957

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

958

if(sd < 0){

1075

959

perror("socket");

1076

960

exitcode = EXIT_FAILURE;

1077

961

#ifdef __linux__

1078

if(restore_loglevel){

1079

ret = klogctl(7, NULL, 0);

1080

if(ret == -1){

1081

perror("klogctl");

1082

}

962

ret = klogctl(7, NULL, 0);

963

if(ret == -1){

964

perror("klogctl");

1083

965

}

1084

#endif /* __linux__ */

966

#endif

1085

967

goto end;

1086

968

}

1087

969

strcpy(network.ifr_name, interface);

1089

971

if(ret == -1){

1090

972

perror("ioctl SIOCGIFFLAGS");

1091

973

#ifdef __linux__

1092

if(restore_loglevel){

1093

ret = klogctl(7, NULL, 0);

1094

if(ret == -1){

1095

perror("klogctl");

1096

}

974

ret = klogctl(7, NULL, 0);

975

if(ret == -1){

976

perror("klogctl");

1097

977

}

1098

#endif /* __linux__ */

978

#endif

1099

979

exitcode = EXIT_FAILURE;

1100

980

goto end;

1101

981

}

1106

986

perror("ioctl SIOCSIFFLAGS");

1107

987

exitcode = EXIT_FAILURE;

1108

988

#ifdef __linux__

1109

if(restore_loglevel){

1110

ret = klogctl(7, NULL, 0);

1111

if(ret == -1){

1112

perror("klogctl");

1113

}

989

ret = klogctl(7, NULL, 0);

990

if(ret == -1){

991

perror("klogctl");

1114

992

}

1115

#endif /* __linux__ */

993

#endif

1116

994

goto end;

1117

995

}

1118

996

}

1135

1013

perror("close");

1136

1014

}

1137

1015

#ifdef __linux__

1138

if(restore_loglevel){

1139

/* Restores kernel loglevel to default */

1140

ret = klogctl(7, NULL, 0);

1141

if(ret == -1){

1142

perror("klogctl");

1143

}

1016

/* Restores kernel loglevel to default */

1017

ret = klogctl(7, NULL, 0);

1018

if(ret == -1){

1019

perror("klogctl");

1144

1020

}

1145

#endif /* __linux__ */

1021

#endif

1146

1022

}

1147

1023

1148

1024

uid = getuid();

1149

1025

gid = getgid();

1150

1026

1151

errno = 0;

1152

1027

setgid(gid);

1153

1028

if(ret == -1){

1154

1029

perror("setgid");

1159

1034

perror("setuid");

1160

1035

}

1161

1036

1162

ret = init_gnutls_global(pubkey, seckey);

1037

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

1163

1038

if(ret == -1){

1164

1039

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

1165

1040

exitcode = EXIT_FAILURE;

1174

1049

}

1175

1050

tempdir_created = true;

1176

1051

1177

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

1052

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

1178

1053

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

1179

1054

exitcode = EXIT_FAILURE;

1180

1055

goto end;

1182

1057

gpgme_initialized = true;

1183

1058

}

1184

1059

1185

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

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

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

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

1060

if_index = (AvahiIfIndex) if_nametoindex(interface);

1061

if(if_index == 0){

1062

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

1063

exitcode = EXIT_FAILURE;

1064

goto end;

1192

1065

}

1193

1066

1194

1067

if(connect_to != NULL){

1201

1074

goto end;

1202

1075

}

1203

1076

uint16_t port;

1204

errno = 0;

1205

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

1206

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

1207

or tmpmax != (uint16_t)tmpmax){

1077

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1078

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1079

or address[numchars+1] != '\0'){

1208

1080

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

1209

1081

exitcode = EXIT_FAILURE;

1210

1082

goto end;

1212

1084

port = (uint16_t)tmpmax;

1213

1085

*address = '\0';

1214

1086

address = connect_to;

1215

/* Colon in address indicates IPv6 */

1216

int af;

1217

if(strchr(address, ':') != NULL){

1218

af = AF_INET6;

1219

} else {

1220

af = AF_INET;

1221

}

1222

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

1087

ret = start_mandos_communication(address, port, if_index, &mc);

1223

1088

if(ret < 0){

1224

1089

exitcode = EXIT_FAILURE;

1225

1090

} else {

1227

1092

}

1228

1093

goto end;

1229

1094

}

1230

1095

1096

if(not debug){

1097

avahi_set_log_function(empty_log);

1098

}

1099

1100

/* Initialize the pseudo-RNG for Avahi */

1101

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

1102

1103

/* Allocate main Avahi loop object */

1104

mc.simple_poll = avahi_simple_poll_new();

1105

if(mc.simple_poll == NULL){

1106

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1107

exitcode = EXIT_FAILURE;

1108

goto end;

1109

}

1110

1231

1111

{

1232

1112

AvahiServerConfig config;

1233

1113

/* Do not publish any local Zeroconf records */

1256

1136

1257

1137

/* Create the Avahi service browser */

1258

1138

sb = avahi_s_service_browser_new(mc.server, if_index,

1259

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

NULL, 0, browse_callback, NULL);

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1261

1141

if(sb == NULL){

1262

1142

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

1263

1143

avahi_strerror(avahi_server_errno(mc.server)));