/mandos/trunk : revision 352

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

33

34

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

34

37

#define _FILE_OFFSET_BITS 64

38

#endif

35

39

36

40

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

37

41

38

42

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

39

stdout, ferror(), sscanf(),

40

remove() */

43

stdout, ferror(), remove() */

41

44

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

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45

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

43

46

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

44

srand() */

45

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

47

srand(), strtof() */

48

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

46

49

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

47

50

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

48

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

51

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

49

52

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

50

53

sockaddr_in6, PF_INET6,

51

SOCK_STREAM, INET6_ADDRSTRLEN,

52

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

53

DIR */

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

54

56

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

55

57

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

56

struct in6_addr, inet_pton(),

57

connect() */

58

inet_pton(), connect() */

58

59

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

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60

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

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61

*/

61

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

62

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

63

strtoimax() */

62

64

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

63

65

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

64

66

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

65

67

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

66

68

SIOCSIFFLAGS, if_indextoname(),

67

69

if_nametoindex(), IF_NAMESIZE */

68

#include <netinet/in.h>

70

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

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

69

73

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

70

74

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

71

75

setgid() */

72

76

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

73

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

77

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

74

78

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

75

79

argp_state, struct argp,

76

80

argp_parse(), ARGP_KEY_ARG,

77

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

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

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

85

78

86

#ifdef __linux__

79

87

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

80

#endif

88

#endif /* __linux__ */

81

89

82

90

/* Avahi */

83

91

/* All Avahi types, constants and functions

129

137

gpgme_ctx_t ctx;

130

138

} mandos_context;

131

139

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

132

145

/*

133

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

134

* "buffer_capacity" is how much is currently allocated,

146

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

147

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

135

148

* "buffer_length" is how much is already used.

136

149

*/

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

150

size_t incbuffer(char **buffer, size_t buffer_length,

138

151

size_t buffer_capacity){

139

152

if(buffer_length + BUFFER_SIZE > buffer_capacity){

140

153

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

149

162

/*

150

163

* Initialize GPGME.

151

164

*/

152

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

165

static bool init_gpgme(const char *seckey,

153

166

const char *pubkey, const char *tempdir){

154

167

int ret;

155

168

gpgme_error_t rc;

176

189

return false;

177

190

}

178

191

179

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

192

rc = gpgme_op_import(mc.ctx, pgp_data);

180

193

if(rc != GPG_ERR_NO_ERROR){

181

194

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

182

195

gpgme_strsource(rc), gpgme_strerror(rc));

192

205

}

193

206

194

207

if(debug){

195

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

208

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

196

209

}

197

210

198

211

/* Init GPGME */

225

238

}

226

239

227

240

/* Create new GPGME "context" */

228

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

241

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

229

242

if(rc != GPG_ERR_NO_ERROR){

230

243

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

231

244

gpgme_strsource(rc), gpgme_strerror(rc));

243

256

* Decrypt OpenPGP data.

244

257

* Returns -1 on error

245

258

*/

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

259

static ssize_t pgp_packet_decrypt(const char *cryptotext,

248

260

size_t crypto_size,

249

261

char **plaintext){

250

262

gpgme_data_t dh_crypto, dh_plain;

277

289

278

290

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

279

291

data buffer */

280

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

292

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

281

293

if(rc != GPG_ERR_NO_ERROR){

282

294

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

283

295

gpgme_strsource(rc), gpgme_strerror(rc));

284

296

plaintext_length = -1;

285

297

if(debug){

286

298

gpgme_decrypt_result_t result;

287

result = gpgme_op_decrypt_result(mc->ctx);

299

result = gpgme_op_decrypt_result(mc.ctx);

288

300

if(result == NULL){

289

301

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

290

302

} else {

297

309

}

298

310

gpgme_recipient_t recipient;

299

311

recipient = result->recipients;

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

}

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;

310

320

}

311

321

}

312

322

}

326

336

327

337

*plaintext = NULL;

328

338

while(true){

329

plaintext_capacity = adjustbuffer(plaintext,

339

plaintext_capacity = incbuffer(plaintext,

330

340

(size_t)plaintext_length,

331

341

plaintext_capacity);

332

342

if(plaintext_capacity == 0){

333

perror("adjustbuffer");

343

perror("incbuffer");

334

344

plaintext_length = -1;

335

345

goto decrypt_end;

336

346

}

382

392

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

383

393

}

384

394

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

395

static int init_gnutls_global(const char *pubkeyfilename,

387

396

const char *seckeyfilename){

388

397

int ret;

389

398

407

416

}

408

417

409

418

/* OpenPGP credentials */

410

gnutls_certificate_allocate_credentials(&mc->cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

411

420

if(ret != GNUTLS_E_SUCCESS){

412

421

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

413

* from

414

* -Wunreachable-code

415

*/

422

from

423

-Wunreachable-code

424

*/

416

425

safer_gnutls_strerror(ret));

417

426

gnutls_global_deinit();

418

427

return -1;

425

434

}

426

435

427

436

ret = gnutls_certificate_set_openpgp_key_file

428

(mc->cred, pubkeyfilename, seckeyfilename,

437

(mc.cred, pubkeyfilename, seckeyfilename,

429

438

GNUTLS_OPENPGP_FMT_BASE64);

430

439

if(ret != GNUTLS_E_SUCCESS){

431

440

fprintf(stderr,

437

446

}

438

447

439

448

/* GnuTLS server initialization */

440

ret = gnutls_dh_params_init(&mc->dh_params);

449

ret = gnutls_dh_params_init(&mc.dh_params);

441

450

if(ret != GNUTLS_E_SUCCESS){

442

451

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

443

452

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

444

453

goto globalfail;

445

454

}

446

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

455

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

447

456

if(ret != GNUTLS_E_SUCCESS){

448

457

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

449

458

safer_gnutls_strerror(ret));

450

459

goto globalfail;

451

460

}

452

461

453

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

462

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

454

463

455

464

return 0;

456

465

457

466

globalfail:

458

467

459

gnutls_certificate_free_credentials(mc->cred);

468

gnutls_certificate_free_credentials(mc.cred);

460

469

gnutls_global_deinit();

461

gnutls_dh_params_deinit(mc->dh_params);

470

gnutls_dh_params_deinit(mc.dh_params);

462

471

return -1;

463

472

}

464

473

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

474

static int init_gnutls_session(gnutls_session_t *session){

467

475

int ret;

468

476

/* GnuTLS session creation */

469

477

ret = gnutls_init(session, GNUTLS_SERVER);

474

482

475

483

{

476

484

const char *err;

477

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

485

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

478

486

if(ret != GNUTLS_E_SUCCESS){

479

487

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

480

488

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

485

493

}

486

494

487

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

496

mc.cred);

489

497

if(ret != GNUTLS_E_SUCCESS){

490

498

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

491

499

safer_gnutls_strerror(ret));

497

505

gnutls_certificate_server_set_request(*session,

498

506

GNUTLS_CERT_IGNORE);

499

507

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

501

509

502

510

return 0;

503

511

}

509

517

/* Called when a Mandos server is found */

510

518

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

511

519

AvahiIfIndex if_index,

512

mandos_context *mc){

520

int af){

513

521

int ret, tcp_sd;

514

522

ssize_t sret;

515

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

523

union {

524

struct sockaddr_in in;

525

struct sockaddr_in6 in6;

526

} to;

516

527

char *buffer = NULL;

517

528

char *decrypted_buffer;

518

529

size_t buffer_length = 0;

520

531

ssize_t decrypted_buffer_size;

521

532

size_t written;

522

533

int retval = 0;

523

char interface[IF_NAMESIZE];

524

534

gnutls_session_t session;

525

526

ret = init_gnutls_session(mc, &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);

527

550

if(ret != 0){

528

551

return -1;

529

552

}

530

553

531

554

if(debug){

532

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

555

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

533

556

"\n", ip, port);

534

557

}

535

558

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

559

tcp_sd = socket(pf, SOCK_STREAM, 0);

537

560

if(tcp_sd < 0){

538

561

perror("socket");

539

562

return -1;

540

563

}

541

564

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

550

565

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

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);

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

}

555

573

if(ret < 0 ){

556

574

perror("inet_pton");

557

575

return -1;

560

578

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

561

579

return -1;

562

580

}

563

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

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

564

599

-Wconversion and

565

600

-Wunreachable-code */

566

567

to.in6.sin6_scope_id = (uint32_t)if_index;

601

}

568

602

569

603

if(debug){

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){

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){

575

627

perror("inet_ntop");

576

628

} else {

577

629

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

580

632

}

581

633

}

582

634

583

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

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

}

584

640

if(ret < 0){

585

641

perror("connect");

586

642

return -1;

632

688

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

633

689

634

690

if(debug){

635

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

691

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

636

692

ip);

637

693

}

638

694

639

695

while(true){

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

696

buffer_capacity = incbuffer(&buffer, buffer_length,

641

697

buffer_capacity);

642

698

if(buffer_capacity == 0){

643

perror("adjustbuffer");

699

perror("incbuffer");

644

700

retval = -1;

645

701

goto mandos_end;

646

702

}

685

741

gnutls_bye(session, GNUTLS_SHUT_RDWR);

686

742

687

743

if(buffer_length > 0){

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

744

decrypted_buffer_size = pgp_packet_decrypt(buffer,

689

745

buffer_length,

690

746

&decrypted_buffer);

691

747

if(decrypted_buffer_size >= 0){

726

782

727

783

static void resolve_callback(AvahiSServiceResolver *r,

728

784

AvahiIfIndex interface,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

785

AvahiProtocol proto,

730

786

AvahiResolverEvent event,

731

787

const char *name,

732

788

const char *type,

737

793

AVAHI_GCC_UNUSED AvahiStringList *txt,

738

794

AVAHI_GCC_UNUSED AvahiLookupResultFlags

739

795

flags,

740

void* userdata){

741

mandos_context *mc = userdata;

796

AVAHI_GCC_UNUSED void* userdata){

742

797

assert(r);

743

798

744

799

/* Called whenever a service has been resolved successfully or

749

804

case AVAHI_RESOLVER_FAILURE:

750

805

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

751

806

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

752

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

807

avahi_strerror(avahi_server_errno(mc.server)));

753

808

break;

754

809

755

810

case AVAHI_RESOLVER_FOUND:

761

816

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

762

817

ip, (intmax_t)interface, port);

763

818

}

764

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

819

int ret = start_mandos_communication(ip, port, interface,

820

avahi_proto_to_af(proto));

765

821

if(ret == 0){

766

avahi_simple_poll_quit(mc->simple_poll);

822

avahi_simple_poll_quit(mc.simple_poll);

767

823

}

768

824

}

769

825

}

779

835

const char *domain,

780

836

AVAHI_GCC_UNUSED AvahiLookupResultFlags

781

837

flags,

782

void* userdata){

783

mandos_context *mc = userdata;

838

AVAHI_GCC_UNUSED void* userdata){

784

839

assert(b);

785

840

786

841

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

791

846

case AVAHI_BROWSER_FAILURE:

792

847

793

848

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

794

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

795

avahi_simple_poll_quit(mc->simple_poll);

849

avahi_strerror(avahi_server_errno(mc.server)));

850

avahi_simple_poll_quit(mc.simple_poll);

796

851

return;

797

852

798

853

case AVAHI_BROWSER_NEW:

801

856

the callback function is called the Avahi server will free the

802

857

resolver for us. */

803

858

804

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

805

protocol, name, type, domain,

806

AVAHI_PROTO_INET6, 0,

807

resolve_callback, mc)))

859

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

860

name, type, domain, protocol, 0,

861

resolve_callback, NULL) == NULL)

808

862

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

809

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

863

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

810

864

break;

811

865

812

866

case AVAHI_BROWSER_REMOVE:

821

875

}

822

876

}

823

877

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

824

893

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

825

894

AvahiSServiceBrowser *sb = NULL;

826

895

int error;

827

896

int ret;

828

897

intmax_t tmpmax;

829

int numchars;

898

char *tmp;

830

899

int exitcode = EXIT_SUCCESS;

831

900

const char *interface = "eth0";

832

901

struct ifreq network;

833

int sd;

902

int sd = -1;

903

bool interface_taken_up = false;

834

904

uid_t uid;

835

905

gid_t gid;

836

906

char *connect_to = NULL;

840

910

const char *seckey = PATHDIR "/" SECKEY;

841

911

const char *pubkey = PATHDIR "/" PUBKEY;

842

912

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

846

913

bool gnutls_initialized = false;

847

914

bool gpgme_initialized = false;

848

double delay = 2.5;

915

float delay = 2.5f;

916

917

struct sigaction old_sigterm_action;

918

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

849

919

850

920

{

851

921

struct argp_option options[] = {

857

927

.group = 1 },

858

928

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

859

929

.arg = "NAME",

860

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

861

" servers",

930

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

931

" Mandos servers",

862

932

.group = 1 },

863

933

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

864

934

.arg = "FILE",

903

973

pubkey = arg;

904

974

break;

905

975

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

906

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

907

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

908

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

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){

909

980

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

910

981

exit(EXIT_FAILURE);

911

982

}

915

986

mc.priority = arg;

916

987

break;

917

988

case 131: /* --delay */

918

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

919

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

989

errno = 0;

990

delay = strtof(arg, &tmp);

991

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

920

992

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

921

993

exit(EXIT_FAILURE);

922

994

}

943

1015

}

944

1016

}

945

1017

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

946

1059

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

947

{

1060

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

948

1061

#ifdef __linux__

949

1062

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

950

1063

messages to mess up the prompt */

951

1064

ret = klogctl(8, NULL, 5);

1065

bool restore_loglevel = true;

952

1066

if(ret == -1){

1067

restore_loglevel = false;

953

1068

perror("klogctl");

954

1069

}

955

#endif

1070

#endif /* __linux__ */

956

1071

957

1072

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

958

1073

if(sd < 0){

959

1074

perror("socket");

960

1075

exitcode = EXIT_FAILURE;

961

1076

#ifdef __linux__

962

ret = klogctl(7, NULL, 0);

963

if(ret == -1){

964

perror("klogctl");

1077

if(restore_loglevel){

1078

ret = klogctl(7, NULL, 0);

1079

if(ret == -1){

1080

perror("klogctl");

1081

}

965

1082

}

966

#endif

1083

#endif /* __linux__ */

967

1084

goto end;

968

1085

}

969

1086

strcpy(network.ifr_name, interface);

971

1088

if(ret == -1){

972

1089

perror("ioctl SIOCGIFFLAGS");

973

1090

#ifdef __linux__

974

ret = klogctl(7, NULL, 0);

975

if(ret == -1){

976

perror("klogctl");

1091

if(restore_loglevel){

1092

ret = klogctl(7, NULL, 0);

1093

if(ret == -1){

1094

perror("klogctl");

1095

}

977

1096

}

978

#endif

1097

#endif /* __linux__ */

979

1098

exitcode = EXIT_FAILURE;

980

1099

goto end;

981

1100

}

986

1105

perror("ioctl SIOCSIFFLAGS");

987

1106

exitcode = EXIT_FAILURE;

988

1107

#ifdef __linux__

989

ret = klogctl(7, NULL, 0);

990

if(ret == -1){

991

perror("klogctl");

1108

if(restore_loglevel){

1109

ret = klogctl(7, NULL, 0);

1110

if(ret == -1){

1111

perror("klogctl");

1112

}

992

1113

}

993

#endif

1114

#endif /* __linux__ */

994

1115

goto end;

995

1116

}

1117

interface_taken_up = true;

996

1118

}

997

1119

/* sleep checking until interface is running */

998

1120

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

1008

1130

perror("nanosleep");

1009

1131

}

1010

1132

}

1011

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

1012

if(ret == -1){

1013

perror("close");

1133

if(not interface_taken_up){

1134

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

1135

if(ret == -1){

1136

perror("close");

1137

}

1014

1138

}

1015

1139

#ifdef __linux__

1016

/* Restores kernel loglevel to default */

1017

ret = klogctl(7, NULL, 0);

1018

if(ret == -1){

1019

perror("klogctl");

1140

if(restore_loglevel){

1141

/* Restores kernel loglevel to default */

1142

ret = klogctl(7, NULL, 0);

1143

if(ret == -1){

1144

perror("klogctl");

1145

}

1020

1146

}

1021

#endif

1147

#endif /* __linux__ */

1022

1148

}

1023

1149

1024

1150

uid = getuid();

1025

1151

gid = getgid();

1026

1152

1153

errno = 0;

1027

1154

setgid(gid);

1028

1155

if(ret == -1){

1029

1156

perror("setgid");

1034

1161

perror("setuid");

1035

1162

}

1036

1163

1037

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

1164

ret = init_gnutls_global(pubkey, seckey);

1038

1165

if(ret == -1){

1039

1166

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

1040

1167

exitcode = EXIT_FAILURE;

1049

1176

}

1050

1177

tempdir_created = true;

1051

1178

1052

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

1179

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

1053

1180

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

1054

1181

exitcode = EXIT_FAILURE;

1055

1182

goto end;

1057

1184

gpgme_initialized = true;

1058

1185

}

1059

1186

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;

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

}

1065

1194

}

1066

1195

1067

1196

if(connect_to != NULL){

1074

1203

goto end;

1075

1204

}

1076

1205

uint16_t port;

1077

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

1078

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

1079

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

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){

1080

1210

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

1081

1211

exitcode = EXIT_FAILURE;

1082

1212

goto end;

1084

1214

port = (uint16_t)tmpmax;

1085

1215

*address = '\0';

1086

1216

address = connect_to;

1087

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

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);

1088

1225

if(ret < 0){

1089

1226

exitcode = EXIT_FAILURE;

1090

1227

} else {

1092

1229

}

1093

1230

goto end;

1094

1231

}

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

1232

1111

1233

{

1112

1234

AvahiServerConfig config;

1113

1235

/* Do not publish any local Zeroconf records */

1136

1258

1137

1259

/* Create the Avahi service browser */

1138

1260

sb = avahi_s_service_browser_new(mc.server, if_index,

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1261

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1262

NULL, 0, browse_callback, NULL);

1141

1263

if(sb == NULL){

1142

1264

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

1143

1265

avahi_strerror(avahi_server_errno(mc.server)));

1179

1301

gpgme_release(mc.ctx);

1180

1302

}

1181

1303

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

1182

1322

/* Removes the temp directory used by GPGME */

1183

1323

if(tempdir_created){

1184

1324

DIR *d;