/mandos/release : revision 237.2.57

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

34

33

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

34

#define _FILE_OFFSET_BITS 64

38

#endif

39

35

40

36

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

41

37

42

38

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

43

stdout, ferror(), remove() */

39

stdout, ferror(), sscanf(),

40

remove() */

44

41

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

45

42

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

46

43

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

47

srand(), strtof() */

48

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

44

srand() */

45

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

49

46

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

50

47

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

51

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

48

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

52

49

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

53

50

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

51

SOCK_STREAM, INET6_ADDRSTRLEN,

52

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

53

DIR */

56

54

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

57

55

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

58

inet_pton(), connect() */

56

struct in6_addr, inet_pton(),

57

connect() */

59

58

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

60

59

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

61

60

*/

62

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

63

strtoimax() */

61

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

64

62

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

65

63

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

66

64

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

67

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,

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

68

#include <netinet/in.h>

73

69

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

74

70

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

75

71

setgid() */

76

72

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

77

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

73

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

78

74

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

79

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__

87

79

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

88

#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"

143

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

144

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.

134

* "buffer_capacity" is how much is currently allocated,

148

135

* "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

150

* Initialize GPGME.

164

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

176

return false;

190

177

}

191

178

192

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

198

/* 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 {

309

297

}

310

298

gpgme_recipient_t recipient;

311

299

recipient = result->recipients;

312

while(recipient != NULL){

313

fprintf(stderr, "Public key algorithm: %s\n",

314

gpgme_pubkey_algo_name(recipient->pubkey_algo));

315

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

316

fprintf(stderr, "Secret key available: %s\n",

317

recipient->status == GPG_ERR_NO_SECKEY

318

? "No" : "Yes");

319

recipient = recipient->next;

300

if(recipient){

301

while(recipient != NULL){

302

fprintf(stderr, "Public key algorithm: %s\n",

303

gpgme_pubkey_algo_name(recipient->pubkey_algo));

304

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

305

fprintf(stderr, "Secret key available: %s\n",

306

recipient->status == GPG_ERR_NO_SECKEY

307

? "No" : "Yes");

308

recipient = recipient->next;

309

}

320

310

}

321

311

}

322

312

}

336

326

337

327

*plaintext = NULL;

338

328

while(true){

339

plaintext_capacity = incbuffer(plaintext,

329

plaintext_capacity = adjustbuffer(plaintext,

340

330

(size_t)plaintext_length,

341

331

plaintext_capacity);

342

332

if(plaintext_capacity == 0){

343

perror("incbuffer");

333

perror("adjustbuffer");

344

334

plaintext_length = -1;

345

335

goto decrypt_end;

346

336

}

392

382

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

393

383

}

394

384

395

static int init_gnutls_global(const char *pubkeyfilename,

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

396

387

const char *seckeyfilename){

397

388

int ret;

398

389

416

407

}

417

408

418

409

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

410

gnutls_certificate_allocate_credentials(&mc->cred);

420

411

if(ret != GNUTLS_E_SUCCESS){

421

412

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

422

from

423

-Wunreachable-code

424

*/

413

* from

414

* -Wunreachable-code

415

*/

425

416

safer_gnutls_strerror(ret));

426

417

gnutls_global_deinit();

427

418

return -1;

434

425

}

435

426

436

427

ret = gnutls_certificate_set_openpgp_key_file

437

(mc.cred, pubkeyfilename, seckeyfilename,

428

(mc->cred, pubkeyfilename, seckeyfilename,

438

429

GNUTLS_OPENPGP_FMT_BASE64);

439

430

if(ret != GNUTLS_E_SUCCESS){

440

431

fprintf(stderr,

446

437

}

447

438

448

439

/* GnuTLS server initialization */

449

ret = gnutls_dh_params_init(&mc.dh_params);

440

ret = gnutls_dh_params_init(&mc->dh_params);

450

441

if(ret != GNUTLS_E_SUCCESS){

451

442

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

452

443

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

453

444

goto globalfail;

454

445

}

455

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

446

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

456

447

if(ret != GNUTLS_E_SUCCESS){

457

448

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

458

449

safer_gnutls_strerror(ret));

459

450

goto globalfail;

460

451

}

461

452

462

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

453

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

463

454

464

455

return 0;

465

456

466

457

globalfail:

467

458

468

gnutls_certificate_free_credentials(mc.cred);

459

gnutls_certificate_free_credentials(mc->cred);

469

460

gnutls_global_deinit();

470

gnutls_dh_params_deinit(mc.dh_params);

461

gnutls_dh_params_deinit(mc->dh_params);

471

462

return -1;

472

463

}

473

464

474

static int init_gnutls_session(gnutls_session_t *session){

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

475

467

int ret;

476

468

/* GnuTLS session creation */

477

469

ret = gnutls_init(session, GNUTLS_SERVER);

482

474

483

475

{

484

476

const char *err;

485

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

477

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

486

478

if(ret != GNUTLS_E_SUCCESS){

487

479

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

488

480

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

493

485

}

494

486

495

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

488

mc->cred);

497

489

if(ret != GNUTLS_E_SUCCESS){

498

490

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

499

491

safer_gnutls_strerror(ret));

505

497

gnutls_certificate_server_set_request(*session,

506

498

GNUTLS_CERT_IGNORE);

507

499

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

509

501

510

502

return 0;

511

503

}

517

509

/* Called when a Mandos server is found */

518

510

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

519

511

AvahiIfIndex if_index,

520

int af){

512

mandos_context *mc){

521

513

int ret, tcp_sd;

522

514

ssize_t sret;

523

union {

524

struct sockaddr_in in;

525

struct sockaddr_in6 in6;

526

} to;

515

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

527

516

char *buffer = NULL;

528

517

char *decrypted_buffer;

529

518

size_t buffer_length = 0;

531

520

ssize_t decrypted_buffer_size;

532

521

size_t written;

533

522

int retval = 0;

523

char interface[IF_NAMESIZE];

534

524

gnutls_session_t session;

535

int pf; /* Protocol family */

536

537

switch(af){

538

case AF_INET6:

539

pf = PF_INET6;

540

break;

541

case AF_INET:

542

pf = PF_INET;

543

break;

544

default:

545

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

546

return -1;

547

}

548

549

ret = init_gnutls_session(&session);

525

526

ret = init_gnutls_session(mc, &session);

550

527

if(ret != 0){

551

528

return -1;

552

529

}

553

530

554

531

if(debug){

555

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

532

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

556

533

"\n", ip, port);

557

534

}

558

535

559

tcp_sd = socket(pf, SOCK_STREAM, 0);

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

560

537

if(tcp_sd < 0){

561

538

perror("socket");

562

539

return -1;

563

540

}

564

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

565

550

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

566

if(af == AF_INET6){

567

to.in6.sin6_family = (sa_family_t)af;

568

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

569

} else { /* IPv4 */

570

to.in.sin_family = (sa_family_t)af;

571

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

572

}

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);

573

555

if(ret < 0 ){

574

556

perror("inet_pton");

575

557

return -1;

578

560

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

579

561

return -1;

580

562

}

581

if(af == AF_INET6){

582

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

583

-Wconversion and

584

-Wunreachable-code */

585

586

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

587

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

588

-Wunreachable-code*/

589

if(if_index == AVAHI_IF_UNSPEC){

590

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

591

" without a network interface\n");

592

return -1;

593

}

594

/* Set the network interface number as scope */

595

to.in6.sin6_scope_id = (uint32_t)if_index;

596

}

597

} else {

598

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

563

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

599

564

-Wconversion and

600

565

-Wunreachable-code */

601

}

566

567

to.in6.sin6_scope_id = (uint32_t)if_index;

602

568

603

569

if(debug){

604

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

605

char interface[IF_NAMESIZE];

606

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

607

perror("if_indextoname");

608

} else {

609

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

610

ip, interface, port);

611

}

612

} else {

613

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

614

port);

615

}

616

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

617

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

618

const char *pcret;

619

if(af == AF_INET6){

620

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

621

sizeof(addrstr));

622

} else {

623

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

624

sizeof(addrstr));

625

}

626

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){

627

575

perror("inet_ntop");

628

576

} else {

629

577

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

632

580

}

633

581

}

634

582

635

if(af == AF_INET6){

636

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

637

} else {

638

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

639

}

583

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

640

584

if(ret < 0){

641

585

perror("connect");

642

586

return -1;

688

632

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

689

633

690

634

if(debug){

691

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

635

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

692

636

ip);

693

637

}

694

638

695

639

while(true){

696

buffer_capacity = incbuffer(&buffer, buffer_length,

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

697

641

buffer_capacity);

698

642

if(buffer_capacity == 0){

699

perror("incbuffer");

643

perror("adjustbuffer");

700

644

retval = -1;

701

645

goto mandos_end;

702

646

}

741

685

gnutls_bye(session, GNUTLS_SHUT_RDWR);

742

686

743

687

if(buffer_length > 0){

744

decrypted_buffer_size = pgp_packet_decrypt(buffer,

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

745

689

buffer_length,

746

690

&decrypted_buffer);

747

691

if(decrypted_buffer_size >= 0){

782

726

783

727

static void resolve_callback(AvahiSServiceResolver *r,

784

728

AvahiIfIndex interface,

785

AvahiProtocol proto,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

786

730

AvahiResolverEvent event,

787

731

const char *name,

788

732

const char *type,

793

737

AVAHI_GCC_UNUSED AvahiStringList *txt,

794

738

AVAHI_GCC_UNUSED AvahiLookupResultFlags

795

739

flags,

796

AVAHI_GCC_UNUSED void* userdata){

740

void* userdata){

741

mandos_context *mc = userdata;

797

742

assert(r);

798

743

799

744

/* Called whenever a service has been resolved successfully or

804

749

case AVAHI_RESOLVER_FAILURE:

805

750

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

806

751

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

807

avahi_strerror(avahi_server_errno(mc.server)));

752

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

808

753

break;

809

754

810

755

case AVAHI_RESOLVER_FOUND:

816

761

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

817

762

ip, (intmax_t)interface, port);

818

763

}

819

int ret = start_mandos_communication(ip, port, interface,

820

avahi_proto_to_af(proto));

764

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

821

765

if(ret == 0){

822

avahi_simple_poll_quit(mc.simple_poll);

766

avahi_simple_poll_quit(mc->simple_poll);

823

767

}

824

768

}

825

769

}

835

779

const char *domain,

836

780

AVAHI_GCC_UNUSED AvahiLookupResultFlags

837

781

flags,

838

AVAHI_GCC_UNUSED void* userdata){

782

void* userdata){

783

mandos_context *mc = userdata;

839

784

assert(b);

840

785

841

786

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

846

791

case AVAHI_BROWSER_FAILURE:

847

792

848

793

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

849

avahi_strerror(avahi_server_errno(mc.server)));

850

avahi_simple_poll_quit(mc.simple_poll);

794

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

795

avahi_simple_poll_quit(mc->simple_poll);

851

796

return;

852

797

853

798

case AVAHI_BROWSER_NEW:

856

801

the callback function is called the Avahi server will free the

857

802

resolver for us. */

858

803

859

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

860

name, type, domain, protocol, 0,

861

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)))

862

808

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

863

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

809

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

864

810

break;

865

811

866

812

case AVAHI_BROWSER_REMOVE:

875

821

}

876

822

}

877

823

878

sig_atomic_t quit_now = 0;

879

880

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

881

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

882

if(quit_now){

883

return;

884

}

885

quit_now = 1;

886

int old_errno = errno;

887

if(mc.simple_poll != NULL){

888

avahi_simple_poll_quit(mc.simple_poll);

889

}

890

errno = old_errno;

891

}

892

893

824

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

894

825

AvahiSServiceBrowser *sb = NULL;

895

826

int error;

896

827

int ret;

897

828

intmax_t tmpmax;

898

char *tmp;

829

int numchars;

899

830

int exitcode = EXIT_SUCCESS;

900

831

const char *interface = "eth0";

901

832

struct ifreq network;

902

int sd = -1;

903

bool interface_taken_up = false;

833

int sd;

904

834

uid_t uid;

905

835

gid_t gid;

906

836

char *connect_to = NULL;

910

840

const char *seckey = PATHDIR "/" SECKEY;

911

841

const char *pubkey = PATHDIR "/" PUBKEY;

912

842

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

913

846

bool gnutls_initialized = false;

914

847

bool gpgme_initialized = false;

915

float delay = 2.5f;

916

917

struct sigaction old_sigterm_action;

918

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

848

double delay = 2.5;

919

849

920

850

{

921

851

struct argp_option options[] = {

927

857

.group = 1 },

928

858

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

929

859

.arg = "NAME",

930

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

931

" Mandos servers",

860

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

861

" servers",

932

862

.group = 1 },

933

863

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

934

864

.arg = "FILE",

973

903

pubkey = arg;

974

904

break;

975

905

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

976

errno = 0;

977

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

978

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

979

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'){

980

909

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

981

910

exit(EXIT_FAILURE);

982

911

}

986

915

mc.priority = arg;

987

916

break;

988

917

case 131: /* --delay */

989

errno = 0;

990

delay = strtof(arg, &tmp);

991

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'){

992

920

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

993

921

exit(EXIT_FAILURE);

994

922

}

1015

943

}

1016

944

}

1017

945

1018

if(not debug){

1019

avahi_set_log_function(empty_log);

1020

}

1021

1022

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

1023

from the signal handler */

1024

/* Initialize the pseudo-RNG for Avahi */

1025

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

1026

mc.simple_poll = avahi_simple_poll_new();

1027

if(mc.simple_poll == NULL){

1028

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

1029

exitcode = EXIT_FAILURE;

1030

goto end;

1031

}

1032

1033

sigemptyset(&sigterm_action.sa_mask);

1034

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

1035

if(ret == -1){

1036

perror("sigaddset");

1037

exitcode = EXIT_FAILURE;

1038

goto end;

1039

}

1040

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

1041

if(ret == -1){

1042

perror("sigaddset");

1043

exitcode = EXIT_FAILURE;

1044

goto end;

1045

}

1046

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

1047

if(ret == -1){

1048

perror("sigaddset");

1049

exitcode = EXIT_FAILURE;

1050

goto end;

1051

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1058

1059

946

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

1060

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

947

{

1061

948

#ifdef __linux__

1062

949

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1063

950

messages to mess up the prompt */

1064

951

ret = klogctl(8, NULL, 5);

1065

bool restore_loglevel = true;

1066

952

if(ret == -1){

1067

restore_loglevel = false;

1068

953

perror("klogctl");

1069

954

}

1070

#endif /* __linux__ */

955

#endif

1071

956

1072

957

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1073

958

if(sd < 0){

1074

959

perror("socket");

1075

960

exitcode = EXIT_FAILURE;

1076

961

#ifdef __linux__

1077

if(restore_loglevel){

1078

ret = klogctl(7, NULL, 0);

1079

if(ret == -1){

1080

perror("klogctl");

1081

}

962

ret = klogctl(7, NULL, 0);

963

if(ret == -1){

964

perror("klogctl");

1082

965

}

1083

#endif /* __linux__ */

966

#endif

1084

967

goto end;

1085

968

}

1086

969

strcpy(network.ifr_name, interface);

1088

971

if(ret == -1){

1089

972

perror("ioctl SIOCGIFFLAGS");

1090

973

#ifdef __linux__

1091

if(restore_loglevel){

1092

ret = klogctl(7, NULL, 0);

1093

if(ret == -1){

1094

perror("klogctl");

1095

}

974

ret = klogctl(7, NULL, 0);

975

if(ret == -1){

976

perror("klogctl");

1096

977

}

1097

#endif /* __linux__ */

978

#endif

1098

979

exitcode = EXIT_FAILURE;

1099

980

goto end;

1100

981

}

1105

986

perror("ioctl SIOCSIFFLAGS");

1106

987

exitcode = EXIT_FAILURE;

1107

988

#ifdef __linux__

1108

if(restore_loglevel){

1109

ret = klogctl(7, NULL, 0);

1110

if(ret == -1){

1111

perror("klogctl");

1112

}

989

ret = klogctl(7, NULL, 0);

990

if(ret == -1){

991

perror("klogctl");

1113

992

}

1114

#endif /* __linux__ */

993

#endif

1115

994

goto end;

1116

995

}

1117

interface_taken_up = true;

1118

996

}

1119

997

/* sleep checking until interface is running */

1120

998

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

1130

1008

perror("nanosleep");

1131

1009

}

1132

1010

}

1133

if(not interface_taken_up){

1134

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

1135

if(ret == -1){

1136

perror("close");

1137

}

1011

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

1012

if(ret == -1){

1013

perror("close");

1138

1014

}

1139

1015

#ifdef __linux__

1140

if(restore_loglevel){

1141

/* Restores kernel loglevel to default */

1142

ret = klogctl(7, NULL, 0);

1143

if(ret == -1){

1144

perror("klogctl");

1145

}

1016

/* Restores kernel loglevel to default */

1017

ret = klogctl(7, NULL, 0);

1018

if(ret == -1){

1019

perror("klogctl");

1146

1020

}

1147

#endif /* __linux__ */

1021

#endif

1148

1022

}

1149

1023

1150

1024

uid = getuid();

1151

1025

gid = getgid();

1152

1026

1153

errno = 0;

1154

1027

setgid(gid);

1155

1028

if(ret == -1){

1156

1029

perror("setgid");

1161

1034

perror("setuid");

1162

1035

}

1163

1036

1164

ret = init_gnutls_global(pubkey, seckey);

1037

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

1165

1038

if(ret == -1){

1166

1039

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

1167

1040

exitcode = EXIT_FAILURE;

1176

1049

}

1177

1050

tempdir_created = true;

1178

1051

1179

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

1052

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

1180

1053

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

1181

1054

exitcode = EXIT_FAILURE;

1182

1055

goto end;

1184

1057

gpgme_initialized = true;

1185

1058

}

1186

1059

1187

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

1188

if_index = (AvahiIfIndex) if_nametoindex(interface);

1189

if(if_index == 0){

1190

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

1191

exitcode = EXIT_FAILURE;

1192

goto end;

1193

}

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;

1194

1065

}

1195

1066

1196

1067

if(connect_to != NULL){

1203

1074

goto end;

1204

1075

}

1205

1076

uint16_t port;

1206

errno = 0;

1207

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

1208

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

1209

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'){

1210

1080

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

1211

1081

exitcode = EXIT_FAILURE;

1212

1082

goto end;

1214

1084

port = (uint16_t)tmpmax;

1215

1085

*address = '\0';

1216

1086

address = connect_to;

1217

/* Colon in address indicates IPv6 */

1218

int af;

1219

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

1220

af = AF_INET6;

1221

} else {

1222

af = AF_INET;

1223

}

1224

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

1087

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

1225

1088

if(ret < 0){

1226

1089

exitcode = EXIT_FAILURE;

1227

1090

} else {

1229

1092

}

1230

1093

goto end;

1231

1094

}

1232

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

1233

1111

{

1234

1112

AvahiServerConfig config;

1235

1113

/* Do not publish any local Zeroconf records */

1258

1136

1259

1137

/* Create the Avahi service browser */

1260

1138

sb = avahi_s_service_browser_new(mc.server, if_index,

1261

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1262

NULL, 0, browse_callback, NULL);

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1263

1141

if(sb == NULL){

1264

1142

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

1265

1143

avahi_strerror(avahi_server_errno(mc.server)));

1301

1179

gpgme_release(mc.ctx);

1302

1180

}

1303

1181

1304

/* Take down the network interface */

1305

if(interface_taken_up){

1306

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

1307

if(ret == -1){

1308

perror("ioctl SIOCGIFFLAGS");

1309

} else if(network.ifr_flags & IFF_UP) {

1310

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

1311

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

1312

if(ret == -1){

1313

perror("ioctl SIOCSIFFLAGS");

1314

}

1315

}

1316

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

1317

if(ret == -1){

1318

perror("close");

1319

}

1320

}

1321

1322

1182

/* Removes the temp directory used by GPGME */

1323

1183

if(tempdir_created){

1324

1184

DIR *d;