/mandos/trunk : revision 24.1.131

36

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

37

38

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

39

stdout, ferror(), remove() */

39

stdout, ferror(), sscanf(),

40

remove() */

40

41

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

41

42

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

42

43

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

43

srand(), strtof() */

44

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

44

srand() */

45

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

45

46

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

46

47

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

47

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

48

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

48

49

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

49

50

sockaddr_in6, PF_INET6,

50

SOCK_STREAM, uid_t, gid_t, open(),

51

opendir(), DIR */

51

SOCK_STREAM, INET6_ADDRSTRLEN,

52

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

53

DIR */

52

54

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

53

55

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

54

inet_pton(), connect() */

56

struct in6_addr, inet_pton(),

57

connect() */

55

58

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

56

59

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

57

60

*/

58

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

59

strtoimax() */

61

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

60

62

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

61

63

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

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64

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

63

65

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

64

66

SIOCSIFFLAGS, if_indextoname(),

65

67

if_nametoindex(), IF_NAMESIZE */

66

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

67

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

68

*/

68

#include <netinet/in.h>

69

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

70

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

71

setgid() */

72

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

73

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

73

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

74

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

75

argp_state, struct argp,

76

argp_parse(), ARGP_KEY_ARG,

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

78

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

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

81

82

78

#ifdef __linux__

83

79

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

84

#endif /* __linux__ */

80

#endif

85

81

86

82

/* Avahi */

87

83

/* All Avahi types, constants and functions

133

129

gpgme_ctx_t ctx;

134

130

} mandos_context;

135

131

136

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

137

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

138

.dh_bits = 1024, .priority = "SECURE256"

139

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

140

141

132

/*

142

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

143

* 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,

144

135

* "buffer_length" is how much is already used.

145

136

*/

146

size_t incbuffer(char **buffer, size_t buffer_length,

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

147

138

size_t buffer_capacity){

148

139

if(buffer_length + BUFFER_SIZE > buffer_capacity){

149

140

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

158

149

/*

159

150

* Initialize GPGME.

160

151

*/

161

static bool init_gpgme(const char *seckey,

152

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

162

153

const char *pubkey, const char *tempdir){

163

154

int ret;

164

155

gpgme_error_t rc;

185

176

return false;

186

177

}

187

178

188

rc = gpgme_op_import(mc.ctx, pgp_data);

179

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

189

180

if(rc != GPG_ERR_NO_ERROR){

190

181

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

191

182

gpgme_strsource(rc), gpgme_strerror(rc));

201

192

}

202

193

203

194

if(debug){

204

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

195

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

205

196

}

206

197

207

198

/* Init GPGME */

234

225

}

235

226

236

227

/* Create new GPGME "context" */

237

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

228

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

238

229

if(rc != GPG_ERR_NO_ERROR){

239

230

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

240

231

gpgme_strsource(rc), gpgme_strerror(rc));

252

243

* Decrypt OpenPGP data.

253

244

* Returns -1 on error

254

245

*/

255

static ssize_t pgp_packet_decrypt(const char *cryptotext,

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

256

248

size_t crypto_size,

257

249

char **plaintext){

258

250

gpgme_data_t dh_crypto, dh_plain;

285

277

286

278

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

287

279

data buffer */

288

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

280

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

289

281

if(rc != GPG_ERR_NO_ERROR){

290

282

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

291

283

gpgme_strsource(rc), gpgme_strerror(rc));

292

284

plaintext_length = -1;

293

285

if(debug){

294

286

gpgme_decrypt_result_t result;

295

result = gpgme_op_decrypt_result(mc.ctx);

287

result = gpgme_op_decrypt_result(mc->ctx);

296

288

if(result == NULL){

297

289

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

298

290

} else {

334

326

335

327

*plaintext = NULL;

336

328

while(true){

337

plaintext_capacity = incbuffer(plaintext,

329

plaintext_capacity = adjustbuffer(plaintext,

338

330

(size_t)plaintext_length,

339

331

plaintext_capacity);

340

332

if(plaintext_capacity == 0){

341

perror("incbuffer");

333

perror("adjustbuffer");

342

334

plaintext_length = -1;

343

335

goto decrypt_end;

344

336

}

390

382

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

391

383

}

392

384

393

static int init_gnutls_global(const char *pubkeyfilename,

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

394

387

const char *seckeyfilename){

395

388

int ret;

396

389

414

407

}

415

408

416

409

/* OpenPGP credentials */

417

gnutls_certificate_allocate_credentials(&mc.cred);

410

gnutls_certificate_allocate_credentials(&mc->cred);

418

411

if(ret != GNUTLS_E_SUCCESS){

419

412

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

420

from

421

-Wunreachable-code

422

*/

413

* from

414

* -Wunreachable-code

415

*/

423

416

safer_gnutls_strerror(ret));

424

417

gnutls_global_deinit();

425

418

return -1;

432

425

}

433

426

434

427

ret = gnutls_certificate_set_openpgp_key_file

435

(mc.cred, pubkeyfilename, seckeyfilename,

428

(mc->cred, pubkeyfilename, seckeyfilename,

436

429

GNUTLS_OPENPGP_FMT_BASE64);

437

430

if(ret != GNUTLS_E_SUCCESS){

438

431

fprintf(stderr,

444

437

}

445

438

446

439

/* GnuTLS server initialization */

447

ret = gnutls_dh_params_init(&mc.dh_params);

440

ret = gnutls_dh_params_init(&mc->dh_params);

448

441

if(ret != GNUTLS_E_SUCCESS){

449

442

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

450

443

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

451

444

goto globalfail;

452

445

}

453

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

446

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

454

447

if(ret != GNUTLS_E_SUCCESS){

455

448

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

456

449

safer_gnutls_strerror(ret));

457

450

goto globalfail;

458

451

}

459

452

460

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

453

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

461

454

462

455

return 0;

463

456

464

457

globalfail:

465

458

466

gnutls_certificate_free_credentials(mc.cred);

459

gnutls_certificate_free_credentials(mc->cred);

467

460

gnutls_global_deinit();

468

gnutls_dh_params_deinit(mc.dh_params);

461

gnutls_dh_params_deinit(mc->dh_params);

469

462

return -1;

470

463

}

471

464

472

static int init_gnutls_session(gnutls_session_t *session){

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

473

467

int ret;

474

468

/* GnuTLS session creation */

475

469

ret = gnutls_init(session, GNUTLS_SERVER);

480

474

481

475

{

482

476

const char *err;

483

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

477

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

484

478

if(ret != GNUTLS_E_SUCCESS){

485

479

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

486

480

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

491

485

}

492

486

493

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

488

mc->cred);

495

489

if(ret != GNUTLS_E_SUCCESS){

496

490

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

497

491

safer_gnutls_strerror(ret));

503

497

gnutls_certificate_server_set_request(*session,

504

498

GNUTLS_CERT_IGNORE);

505

499

506

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

507

501

508

502

return 0;

509

503

}

515

509

/* Called when a Mandos server is found */

516

510

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

517

511

AvahiIfIndex if_index,

518

int af){

512

mandos_context *mc){

519

513

int ret, tcp_sd;

520

514

ssize_t sret;

521

union {

522

struct sockaddr_in in;

523

struct sockaddr_in6 in6;

524

} to;

515

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

525

516

char *buffer = NULL;

526

517

char *decrypted_buffer;

527

518

size_t buffer_length = 0;

529

520

ssize_t decrypted_buffer_size;

530

521

size_t written;

531

522

int retval = 0;

523

char interface[IF_NAMESIZE];

532

524

gnutls_session_t session;

533

int pf; /* Protocol family */

534

535

switch(af){

536

case AF_INET6:

537

pf = PF_INET6;

538

break;

539

case AF_INET:

540

pf = PF_INET;

541

break;

542

default:

543

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

544

return -1;

545

}

546

547

ret = init_gnutls_session(&session);

525

526

ret = init_gnutls_session(mc, &session);

548

527

if(ret != 0){

549

528

return -1;

550

529

}

551

530

552

531

if(debug){

553

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

532

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

554

533

"\n", ip, port);

555

534

}

556

535

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

558

537

if(tcp_sd < 0){

559

538

perror("socket");

560

539

return -1;

561

540

}

562

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

563

550

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

564

if(af == AF_INET6){

565

to.in6.sin6_family = (uint16_t)af;

566

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

567

} else { /* IPv4 */

568

to.in.sin_family = (sa_family_t)af;

569

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

570

}

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);

571

555

if(ret < 0 ){

572

556

perror("inet_pton");

573

557

return -1;

576

560

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

577

561

return -1;

578

562

}

579

if(af == AF_INET6){

580

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

581

-Wconversion and

582

-Wunreachable-code */

583

584

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

585

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

586

-Wunreachable-code*/

587

if(if_index == AVAHI_IF_UNSPEC){

588

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

589

" without a network interface\n");

590

return -1;

591

}

592

/* Set the network interface number as scope */

593

to.in6.sin6_scope_id = (uint32_t)if_index;

594

}

595

} else {

596

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

563

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

597

564

-Wconversion and

598

565

-Wunreachable-code */

599

}

566

567

to.in6.sin6_scope_id = (uint32_t)if_index;

600

568

601

569

if(debug){

602

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

603

char interface[IF_NAMESIZE];

604

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

605

perror("if_indextoname");

606

} else {

607

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

608

ip, interface, port);

609

}

610

} else {

611

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

612

port);

613

}

614

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

615

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

616

const char *pcret;

617

if(af == AF_INET6){

618

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

619

sizeof(addrstr));

620

} else {

621

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

622

sizeof(addrstr));

623

}

624

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){

625

575

perror("inet_ntop");

626

576

} else {

627

577

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

630

580

}

631

581

}

632

582

633

if(af == AF_INET6){

634

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

635

} else {

636

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

637

}

583

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

638

584

if(ret < 0){

639

585

perror("connect");

640

586

return -1;

686

632

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

687

633

688

634

if(debug){

689

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

635

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

690

636

ip);

691

637

}

692

638

693

639

while(true){

694

buffer_capacity = incbuffer(&buffer, buffer_length,

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

695

641

buffer_capacity);

696

642

if(buffer_capacity == 0){

697

perror("incbuffer");

643

perror("adjustbuffer");

698

644

retval = -1;

699

645

goto mandos_end;

700

646

}

739

685

gnutls_bye(session, GNUTLS_SHUT_RDWR);

740

686

741

687

if(buffer_length > 0){

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

743

689

buffer_length,

744

690

&decrypted_buffer);

745

691

if(decrypted_buffer_size >= 0){

780

726

781

727

static void resolve_callback(AvahiSServiceResolver *r,

782

728

AvahiIfIndex interface,

783

AvahiProtocol proto,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

784

730

AvahiResolverEvent event,

785

731

const char *name,

786

732

const char *type,

791

737

AVAHI_GCC_UNUSED AvahiStringList *txt,

792

738

AVAHI_GCC_UNUSED AvahiLookupResultFlags

793

739

flags,

794

AVAHI_GCC_UNUSED void* userdata){

740

void* userdata){

741

mandos_context *mc = userdata;

795

742

assert(r);

796

743

797

744

/* Called whenever a service has been resolved successfully or

802

749

case AVAHI_RESOLVER_FAILURE:

803

750

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

804

751

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

805

avahi_strerror(avahi_server_errno(mc.server)));

752

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

806

753

break;

807

754

808

755

case AVAHI_RESOLVER_FOUND:

814

761

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

815

762

ip, (intmax_t)interface, port);

816

763

}

817

int ret = start_mandos_communication(ip, port, interface,

818

avahi_proto_to_af(proto));

764

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

819

765

if(ret == 0){

820

avahi_simple_poll_quit(mc.simple_poll);

766

avahi_simple_poll_quit(mc->simple_poll);

821

767

}

822

768

}

823

769

}

833

779

const char *domain,

834

780

AVAHI_GCC_UNUSED AvahiLookupResultFlags

835

781

flags,

836

AVAHI_GCC_UNUSED void* userdata){

782

void* userdata){

783

mandos_context *mc = userdata;

837

784

assert(b);

838

785

839

786

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

844

791

case AVAHI_BROWSER_FAILURE:

845

792

846

793

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

847

avahi_strerror(avahi_server_errno(mc.server)));

848

avahi_simple_poll_quit(mc.simple_poll);

794

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

795

avahi_simple_poll_quit(mc->simple_poll);

849

796

return;

850

797

851

798

case AVAHI_BROWSER_NEW:

854

801

the callback function is called the Avahi server will free the

855

802

resolver for us. */

856

803

857

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

858

name, type, domain, protocol, 0,

859

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)))

860

808

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

861

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

809

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

862

810

break;

863

811

864

812

case AVAHI_BROWSER_REMOVE:

873

821

}

874

822

}

875

823

876

sig_atomic_t quit_now = 0;

877

878

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

879

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

880

if(quit_now){

881

return;

882

}

883

quit_now = 1;

884

int old_errno = errno;

885

if(mc.simple_poll != NULL){

886

avahi_simple_poll_quit(mc.simple_poll);

887

}

888

errno = old_errno;

889

}

890

891

824

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

892

825

AvahiSServiceBrowser *sb = NULL;

893

826

int error;

894

827

int ret;

895

828

intmax_t tmpmax;

896

char *tmp;

829

int numchars;

897

830

int exitcode = EXIT_SUCCESS;

898

831

const char *interface = "eth0";

899

832

struct ifreq network;

907

840

const char *seckey = PATHDIR "/" SECKEY;

908

841

const char *pubkey = PATHDIR "/" PUBKEY;

909

842

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

910

846

bool gnutls_initialized = false;

911

847

bool gpgme_initialized = false;

912

float delay = 2.5f;

913

914

struct sigaction old_sigterm_action;

915

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

848

double delay = 2.5;

916

849

917

850

{

918

851

struct argp_option options[] = {

924

857

.group = 1 },

925

858

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

926

859

.arg = "NAME",

927

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

928

" Mandos servers",

860

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

861

" servers",

929

862

.group = 1 },

930

863

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

931

864

.arg = "FILE",

970

903

pubkey = arg;

971

904

break;

972

905

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

973

errno = 0;

974

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

975

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

976

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'){

977

909

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

978

910

exit(EXIT_FAILURE);

979

911

}

983

915

mc.priority = arg;

984

916

break;

985

917

case 131: /* --delay */

986

errno = 0;

987

delay = strtof(arg, &tmp);

988

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'){

989

920

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

990

921

exit(EXIT_FAILURE);

991

922

}

1012

943

}

1013

944

}

1014

945

1015

if(not debug){

1016

avahi_set_log_function(empty_log);

1017

}

1018

1019

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

1020

from the signal handler */

1021

/* Initialize the pseudo-RNG for Avahi */

1022

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

1023

mc.simple_poll = avahi_simple_poll_new();

1024

if(mc.simple_poll == NULL){

1025

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

1026

exitcode = EXIT_FAILURE;

1027

goto end;

1028

}

1029

1030

sigemptyset(&sigterm_action.sa_mask);

1031

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

1032

if(ret == -1){

1033

perror("sigaddset");

1034

exitcode = EXIT_FAILURE;

1035

goto end;

1036

}

1037

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

1038

if(ret == -1){

1039

perror("sigaddset");

1040

exitcode = EXIT_FAILURE;

1041

goto end;

1042

}

1043

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

1044

if(ret == -1){

1045

perror("sigaddset");

1046

exitcode = EXIT_FAILURE;

1047

goto end;

1048

}

1049

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

1050

if(ret == -1){

1051

perror("sigaction");

1052

exitcode = EXIT_FAILURE;

1053

goto end;

1054

}

1055

1056

946

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

1057

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

947

{

1058

948

#ifdef __linux__

1059

949

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1060

950

messages to mess up the prompt */

1061

951

ret = klogctl(8, NULL, 5);

1062

bool restore_loglevel = true;

1063

952

if(ret == -1){

1064

restore_loglevel = false;

1065

953

perror("klogctl");

1066

954

}

1067

#endif /* __linux__ */

955

#endif

1068

956

1069

957

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1070

958

if(sd < 0){

1071

959

perror("socket");

1072

960

exitcode = EXIT_FAILURE;

1073

961

#ifdef __linux__

1074

if(restore_loglevel){

1075

ret = klogctl(7, NULL, 0);

1076

if(ret == -1){

1077

perror("klogctl");

1078

}

962

ret = klogctl(7, NULL, 0);

963

if(ret == -1){

964

perror("klogctl");

1079

965

}

1080

#endif /* __linux__ */

966

#endif

1081

967

goto end;

1082

968

}

1083

969

strcpy(network.ifr_name, interface);

1085

971

if(ret == -1){

1086

972

perror("ioctl SIOCGIFFLAGS");

1087

973

#ifdef __linux__

1088

if(restore_loglevel){

1089

ret = klogctl(7, NULL, 0);

1090

if(ret == -1){

1091

perror("klogctl");

1092

}

974

ret = klogctl(7, NULL, 0);

975

if(ret == -1){

976

perror("klogctl");

1093

977

}

1094

#endif /* __linux__ */

978

#endif

1095

979

exitcode = EXIT_FAILURE;

1096

980

goto end;

1097

981

}

1102

986

perror("ioctl SIOCSIFFLAGS");

1103

987

exitcode = EXIT_FAILURE;

1104

988

#ifdef __linux__

1105

if(restore_loglevel){

1106

ret = klogctl(7, NULL, 0);

1107

if(ret == -1){

1108

perror("klogctl");

1109

}

989

ret = klogctl(7, NULL, 0);

990

if(ret == -1){

991

perror("klogctl");

1110

992

}

1111

#endif /* __linux__ */

993

#endif

1112

994

goto end;

1113

995

}

1114

996

}

1131

1013

perror("close");

1132

1014

}

1133

1015

#ifdef __linux__

1134

if(restore_loglevel){

1135

/* Restores kernel loglevel to default */

1136

ret = klogctl(7, NULL, 0);

1137

if(ret == -1){

1138

perror("klogctl");

1139

}

1016

/* Restores kernel loglevel to default */

1017

ret = klogctl(7, NULL, 0);

1018

if(ret == -1){

1019

perror("klogctl");

1140

1020

}

1141

#endif /* __linux__ */

1021

#endif

1142

1022

}

1143

1023

1144

1024

uid = getuid();

1145

1025

gid = getgid();

1146

1026

1147

errno = 0;

1148

1027

setgid(gid);

1149

1028

if(ret == -1){

1150

1029

perror("setgid");

1155

1034

perror("setuid");

1156

1035

}

1157

1036

1158

ret = init_gnutls_global(pubkey, seckey);

1037

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

1159

1038

if(ret == -1){

1160

1039

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

1161

1040

exitcode = EXIT_FAILURE;

1170

1049

}

1171

1050

tempdir_created = true;

1172

1051

1173

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

1052

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

1174

1053

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

1175

1054

exitcode = EXIT_FAILURE;

1176

1055

goto end;

1178

1057

gpgme_initialized = true;

1179

1058

}

1180

1059

1181

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

1182

if_index = (AvahiIfIndex) if_nametoindex(interface);

1183

if(if_index == 0){

1184

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

1185

exitcode = EXIT_FAILURE;

1186

goto end;

1187

}

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;

1188

1065

}

1189

1066

1190

1067

if(connect_to != NULL){

1197

1074

goto end;

1198

1075

}

1199

1076

uint16_t port;

1200

errno = 0;

1201

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

1202

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

1203

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'){

1204

1080

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

1205

1081

exitcode = EXIT_FAILURE;

1206

1082

goto end;

1208

1084

port = (uint16_t)tmpmax;

1209

1085

*address = '\0';

1210

1086

address = connect_to;

1211

/* Colon in address indicates IPv6 */

1212

int af;

1213

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

1214

af = AF_INET6;

1215

} else {

1216

af = AF_INET;

1217

}

1218

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

1087

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

1219

1088

if(ret < 0){

1220

1089

exitcode = EXIT_FAILURE;

1221

1090

} else {

1223

1092

}

1224

1093

goto end;

1225

1094

}

1226

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

1227

1111

{

1228

1112

AvahiServerConfig config;

1229

1113

/* Do not publish any local Zeroconf records */

1252

1136

1253

1137

/* Create the Avahi service browser */

1254

1138

sb = avahi_s_service_browser_new(mc.server, if_index,

1255

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1256

NULL, 0, browse_callback, NULL);

1139

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1257

1141

if(sb == NULL){

1258

1142

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

1259

1143

avahi_strerror(avahi_server_errno(mc.server)));