/mandos/release : revision 237.2.75

36

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

37

38

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

39

stdout, ferror(), sscanf(),

40

remove() */

39

stdout, ferror(), remove() */

41

40

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

42

41

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

43

42

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

44

srand() */

45

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

43

srand(), strtof() */

44

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

46

45

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

47

46

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

48

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

47

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

49

48

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

50

49

sockaddr_in6, PF_INET6,

51

SOCK_STREAM, INET6_ADDRSTRLEN,

52

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

53

DIR */

50

SOCK_STREAM, uid_t, gid_t, open(),

51

opendir(), DIR */

54

52

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

55

53

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

56

struct in6_addr, inet_pton(),

57

connect() */

54

inet_pton(), connect() */

58

55

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

59

56

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

60

57

*/

61

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

58

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

59

strtoimax() */

62

60

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

63

61

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

64

62

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

65

63

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

66

64

SIOCSIFFLAGS, if_indextoname(),

67

65

if_nametoindex(), IF_NAMESIZE */

68

#include <netinet/in.h>

66

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

67

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

68

*/

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, and, or */

73

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

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

78

82

#ifdef __linux__

79

83

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

80

#endif

84

#endif /* __linux__ */

81

85

82

86

/* Avahi */

83

87

/* All Avahi types, constants and functions

129

133

gpgme_ctx_t ctx;

130

134

} mandos_context;

131

135

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

132

141

/*

133

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

134

* "buffer_capacity" is how much is currently allocated,

142

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

143

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

135

144

* "buffer_length" is how much is already used.

136

145

*/

137

size_t adjustbuffer(char **buffer, size_t buffer_length,

146

size_t incbuffer(char **buffer, size_t buffer_length,

138

147

size_t buffer_capacity){

139

148

if(buffer_length + BUFFER_SIZE > buffer_capacity){

140

149

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

149

158

/*

150

159

* Initialize GPGME.

151

160

*/

152

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

161

static bool init_gpgme(const char *seckey,

153

162

const char *pubkey, const char *tempdir){

154

163

int ret;

155

164

gpgme_error_t rc;

176

185

return false;

177

186

}

178

187

179

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

188

rc = gpgme_op_import(mc.ctx, pgp_data);

180

189

if(rc != GPG_ERR_NO_ERROR){

181

190

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

182

191

gpgme_strsource(rc), gpgme_strerror(rc));

192

201

}

193

202

194

203

if(debug){

195

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

204

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

196

205

}

197

206

198

207

/* Init GPGME */

225

234

}

226

235

227

236

/* Create new GPGME "context" */

228

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

237

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

229

238

if(rc != GPG_ERR_NO_ERROR){

230

239

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

231

240

gpgme_strsource(rc), gpgme_strerror(rc));

243

252

* Decrypt OpenPGP data.

244

253

* Returns -1 on error

245

254

*/

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

255

static ssize_t pgp_packet_decrypt(const char *cryptotext,

248

256

size_t crypto_size,

249

257

char **plaintext){

250

258

gpgme_data_t dh_crypto, dh_plain;

277

285

278

286

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

279

287

data buffer */

280

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

288

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

281

289

if(rc != GPG_ERR_NO_ERROR){

282

290

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

283

291

gpgme_strsource(rc), gpgme_strerror(rc));

284

292

plaintext_length = -1;

285

293

if(debug){

286

294

gpgme_decrypt_result_t result;

287

result = gpgme_op_decrypt_result(mc->ctx);

295

result = gpgme_op_decrypt_result(mc.ctx);

288

296

if(result == NULL){

289

297

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

290

298

} else {

326

334

327

335

*plaintext = NULL;

328

336

while(true){

329

plaintext_capacity = adjustbuffer(plaintext,

337

plaintext_capacity = incbuffer(plaintext,

330

338

(size_t)plaintext_length,

331

339

plaintext_capacity);

332

340

if(plaintext_capacity == 0){

333

perror("adjustbuffer");

341

perror("incbuffer");

334

342

plaintext_length = -1;

335

343

goto decrypt_end;

336

344

}

382

390

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

383

391

}

384

392

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

393

static int init_gnutls_global(const char *pubkeyfilename,

387

394

const char *seckeyfilename){

388

395

int ret;

389

396

407

414

}

408

415

409

416

/* OpenPGP credentials */

410

gnutls_certificate_allocate_credentials(&mc->cred);

417

gnutls_certificate_allocate_credentials(&mc.cred);

411

418

if(ret != GNUTLS_E_SUCCESS){

412

419

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

413

* from

414

* -Wunreachable-code

415

*/

420

from

421

-Wunreachable-code

422

*/

416

423

safer_gnutls_strerror(ret));

417

424

gnutls_global_deinit();

418

425

return -1;

425

432

}

426

433

427

434

ret = gnutls_certificate_set_openpgp_key_file

428

(mc->cred, pubkeyfilename, seckeyfilename,

435

(mc.cred, pubkeyfilename, seckeyfilename,

429

436

GNUTLS_OPENPGP_FMT_BASE64);

430

437

if(ret != GNUTLS_E_SUCCESS){

431

438

fprintf(stderr,

437

444

}

438

445

439

446

/* GnuTLS server initialization */

440

ret = gnutls_dh_params_init(&mc->dh_params);

447

ret = gnutls_dh_params_init(&mc.dh_params);

441

448

if(ret != GNUTLS_E_SUCCESS){

442

449

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

443

450

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

444

451

goto globalfail;

445

452

}

446

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

453

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

447

454

if(ret != GNUTLS_E_SUCCESS){

448

455

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

449

456

safer_gnutls_strerror(ret));

450

457

goto globalfail;

451

458

}

452

459

453

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

460

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

454

461

455

462

return 0;

456

463

457

464

globalfail:

458

465

459

gnutls_certificate_free_credentials(mc->cred);

466

gnutls_certificate_free_credentials(mc.cred);

460

467

gnutls_global_deinit();

461

gnutls_dh_params_deinit(mc->dh_params);

468

gnutls_dh_params_deinit(mc.dh_params);

462

469

return -1;

463

470

}

464

471

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

472

static int init_gnutls_session(gnutls_session_t *session){

467

473

int ret;

468

474

/* GnuTLS session creation */

469

475

ret = gnutls_init(session, GNUTLS_SERVER);

474

480

475

481

{

476

482

const char *err;

477

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

483

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

478

484

if(ret != GNUTLS_E_SUCCESS){

479

485

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

480

486

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

485

491

}

486

492

487

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

494

mc.cred);

489

495

if(ret != GNUTLS_E_SUCCESS){

490

496

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

491

497

safer_gnutls_strerror(ret));

497

503

gnutls_certificate_server_set_request(*session,

498

504

GNUTLS_CERT_IGNORE);

499

505

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

506

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

501

507

502

508

return 0;

503

509

}

509

515

/* Called when a Mandos server is found */

510

516

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

511

517

AvahiIfIndex if_index,

512

mandos_context *mc){

518

int af){

513

519

int ret, tcp_sd;

514

520

ssize_t sret;

515

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

521

union {

522

struct sockaddr_in in;

523

struct sockaddr_in6 in6;

524

} to;

516

525

char *buffer = NULL;

517

526

char *decrypted_buffer;

518

527

size_t buffer_length = 0;

520

529

ssize_t decrypted_buffer_size;

521

530

size_t written;

522

531

int retval = 0;

523

char interface[IF_NAMESIZE];

524

532

gnutls_session_t session;

525

526

ret = init_gnutls_session(mc, &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);

527

548

if(ret != 0){

528

549

return -1;

529

550

}

530

551

531

552

if(debug){

532

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

553

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

533

554

"\n", ip, port);

534

555

}

535

556

536

tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

537

558

if(tcp_sd < 0){

538

559

perror("socket");

539

560

return -1;

540

561

}

541

562

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

563

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);

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

}

555

571

if(ret < 0 ){

556

572

perror("inet_pton");

557

573

return -1;

560

576

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

561

577

return -1;

562

578

}

563

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

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

564

597

-Wconversion and

565

598

-Wunreachable-code */

566

567

to.in6.sin6_scope_id = (uint32_t)if_index;

599

}

568

600

569

601

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){

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){

575

625

perror("inet_ntop");

576

626

} else {

577

627

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

580

630

}

581

631

}

582

632

583

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

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

}

584

638

if(ret < 0){

585

639

perror("connect");

586

640

return -1;

632

686

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

633

687

634

688

if(debug){

635

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

689

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

636

690

ip);

637

691

}

638

692

639

693

while(true){

640

buffer_capacity = adjustbuffer(&buffer, buffer_length,

694

buffer_capacity = incbuffer(&buffer, buffer_length,

641

695

buffer_capacity);

642

696

if(buffer_capacity == 0){

643

perror("adjustbuffer");

697

perror("incbuffer");

644

698

retval = -1;

645

699

goto mandos_end;

646

700

}

685

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

686

740

687

741

if(buffer_length > 0){

688

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

689

743

buffer_length,

690

744

&decrypted_buffer);

691

745

if(decrypted_buffer_size >= 0){

726

780

727

781

static void resolve_callback(AvahiSServiceResolver *r,

728

782

AvahiIfIndex interface,

729

AVAHI_GCC_UNUSED AvahiProtocol protocol,

783

AvahiProtocol proto,

730

784

AvahiResolverEvent event,

731

785

const char *name,

732

786

const char *type,

737

791

AVAHI_GCC_UNUSED AvahiStringList *txt,

738

792

AVAHI_GCC_UNUSED AvahiLookupResultFlags

739

793

flags,

740

void* userdata){

741

mandos_context *mc = userdata;

794

AVAHI_GCC_UNUSED void* userdata){

742

795

assert(r);

743

796

744

797

/* Called whenever a service has been resolved successfully or

749

802

case AVAHI_RESOLVER_FAILURE:

750

803

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

751

804

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

752

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

805

avahi_strerror(avahi_server_errno(mc.server)));

753

806

break;

754

807

755

808

case AVAHI_RESOLVER_FOUND:

761

814

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

762

815

ip, (intmax_t)interface, port);

763

816

}

764

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

817

int ret = start_mandos_communication(ip, port, interface,

818

avahi_proto_to_af(proto));

765

819

if(ret == 0){

766

avahi_simple_poll_quit(mc->simple_poll);

820

avahi_simple_poll_quit(mc.simple_poll);

767

821

}

768

822

}

769

823

}

779

833

const char *domain,

780

834

AVAHI_GCC_UNUSED AvahiLookupResultFlags

781

835

flags,

782

void* userdata){

783

mandos_context *mc = userdata;

836

AVAHI_GCC_UNUSED void* userdata){

784

837

assert(b);

785

838

786

839

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

791

844

case AVAHI_BROWSER_FAILURE:

792

845

793

846

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

794

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

795

avahi_simple_poll_quit(mc->simple_poll);

847

avahi_strerror(avahi_server_errno(mc.server)));

848

avahi_simple_poll_quit(mc.simple_poll);

796

849

return;

797

850

798

851

case AVAHI_BROWSER_NEW:

801

854

the callback function is called the Avahi server will free the

802

855

resolver for us. */

803

856

804

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

857

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

805

858

protocol, name, type, domain,

806

859

AVAHI_PROTO_INET6, 0,

807

resolve_callback, mc)))

860

resolve_callback, NULL)))

808

861

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

809

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

862

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

810

863

break;

811

864

812

865

case AVAHI_BROWSER_REMOVE:

821

874

}

822

875

}

823

876

877

sig_atomic_t quit_now = 0;

878

879

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

880

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

881

if(quit_now){

882

return;

883

}

884

quit_now = 1;

885

int old_errno = errno;

886

if(mc.simple_poll != NULL){

887

avahi_simple_poll_quit(mc.simple_poll);

888

}

889

errno = old_errno;

890

}

891

824

892

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

825

893

AvahiSServiceBrowser *sb = NULL;

826

894

int error;

827

895

int ret;

828

896

intmax_t tmpmax;

829

int numchars;

897

char *tmp;

830

898

int exitcode = EXIT_SUCCESS;

831

899

const char *interface = "eth0";

832

900

struct ifreq network;

840

908

const char *seckey = PATHDIR "/" SECKEY;

841

909

const char *pubkey = PATHDIR "/" PUBKEY;

842

910

843

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

844

.dh_bits = 1024, .priority = "SECURE256"

845

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

911

/* Initialize Mandos context */

912

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

913

.dh_bits = 1024, .priority = "SECURE256"

914

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

846

915

bool gnutls_initialized = false;

847

916

bool gpgme_initialized = false;

848

double delay = 2.5;

917

float delay = 2.5f;

918

919

struct sigaction old_sigterm_action;

920

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

849

921

850

922

{

851

923

struct argp_option options[] = {

857

929

.group = 1 },

858

930

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

859

931

.arg = "NAME",

860

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

861

" servers",

932

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

933

" Mandos servers",

862

934

.group = 1 },

863

935

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

864

936

.arg = "FILE",

903

975

pubkey = arg;

904

976

break;

905

977

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'){

978

errno = 0;

979

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

980

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

981

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

909

982

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

910

983

exit(EXIT_FAILURE);

911

984

}

915

988

mc.priority = arg;

916

989

break;

917

990

case 131: /* --delay */

918

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

919

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

991

errno = 0;

992

delay = strtof(arg, &tmp);

993

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

920

994

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

921

995

exit(EXIT_FAILURE);

922

996

}

943

1017

}

944

1018

}

945

1019

1020

if(not debug){

1021

avahi_set_log_function(empty_log);

1022

}

1023

1024

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

1025

from the signal handler */

1026

/* Initialize the pseudo-RNG for Avahi */

1027

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

1028

mc.simple_poll = avahi_simple_poll_new();

1029

if(mc.simple_poll == NULL){

1030

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

1031

exitcode = EXIT_FAILURE;

1032

goto end;

1033

}

1034

1035

sigemptyset(&sigterm_action.sa_mask);

1036

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

1037

if(ret == -1){

1038

perror("sigaddset");

1039

exitcode = EXIT_FAILURE;

1040

goto end;

1041

}

1042

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

1043

if(ret == -1){

1044

perror("sigaddset");

1045

exitcode = EXIT_FAILURE;

1046

goto end;

1047

}

1048

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

1049

if(ret == -1){

1050

perror("sigaddset");

1051

exitcode = EXIT_FAILURE;

1052

goto end;

1053

}

1054

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

1055

if(ret == -1){

1056

perror("sigaction");

1057

exitcode = EXIT_FAILURE;

1058

goto end;

1059

}

1060

946

1061

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

947

{

1062

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

948

1063

#ifdef __linux__

949

1064

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

950

1065

messages to mess up the prompt */

951

1066

ret = klogctl(8, NULL, 5);

1067

bool restore_loglevel = true;

952

1068

if(ret == -1){

1069

restore_loglevel = false;

953

1070

perror("klogctl");

954

1071

}

955

#endif

1072

#endif /* __linux__ */

956

1073

957

1074

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

958

1075

if(sd < 0){

959

1076

perror("socket");

960

1077

exitcode = EXIT_FAILURE;

961

1078

#ifdef __linux__

962

ret = klogctl(7, NULL, 0);

963

if(ret == -1){

964

perror("klogctl");

1079

if(restore_loglevel){

1080

ret = klogctl(7, NULL, 0);

1081

if(ret == -1){

1082

perror("klogctl");

1083

}

965

1084

}

966

#endif

1085

#endif /* __linux__ */

967

1086

goto end;

968

1087

}

969

1088

strcpy(network.ifr_name, interface);

971

1090

if(ret == -1){

972

1091

perror("ioctl SIOCGIFFLAGS");

973

1092

#ifdef __linux__

974

ret = klogctl(7, NULL, 0);

975

if(ret == -1){

976

perror("klogctl");

1093

if(restore_loglevel){

1094

ret = klogctl(7, NULL, 0);

1095

if(ret == -1){

1096

perror("klogctl");

1097

}

977

1098

}

978

#endif

1099

#endif /* __linux__ */

979

1100

exitcode = EXIT_FAILURE;

980

1101

goto end;

981

1102

}

986

1107

perror("ioctl SIOCSIFFLAGS");

987

1108

exitcode = EXIT_FAILURE;

988

1109

#ifdef __linux__

989

ret = klogctl(7, NULL, 0);

990

if(ret == -1){

991

perror("klogctl");

1110

if(restore_loglevel){

1111

ret = klogctl(7, NULL, 0);

1112

if(ret == -1){

1113

perror("klogctl");

1114

}

992

1115

}

993

#endif

1116

#endif /* __linux__ */

994

1117

goto end;

995

1118

}

996

1119

}

1013

1136

perror("close");

1014

1137

}

1015

1138

#ifdef __linux__

1016

/* Restores kernel loglevel to default */

1017

ret = klogctl(7, NULL, 0);

1018

if(ret == -1){

1019

perror("klogctl");

1139

if(restore_loglevel){

1140

/* Restores kernel loglevel to default */

1141

ret = klogctl(7, NULL, 0);

1142

if(ret == -1){

1143

perror("klogctl");

1144

}

1020

1145

}

1021

#endif

1146

#endif /* __linux__ */

1022

1147

}

1023

1148

1024

1149

uid = getuid();

1025

1150

gid = getgid();

1026

1151

1152

errno = 0;

1027

1153

setgid(gid);

1028

1154

if(ret == -1){

1029

1155

perror("setgid");

1034

1160

perror("setuid");

1035

1161

}

1036

1162

1037

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

1163

ret = init_gnutls_global(pubkey, seckey);

1038

1164

if(ret == -1){

1039

1165

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

1040

1166

exitcode = EXIT_FAILURE;

1049

1175

}

1050

1176

tempdir_created = true;

1051

1177

1052

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

1178

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

1053

1179

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

1054

1180

exitcode = EXIT_FAILURE;

1055

1181

goto end;

1057

1183

gpgme_initialized = true;

1058

1184

}

1059

1185

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;

1186

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

1187

if_index = (AvahiIfIndex) if_nametoindex(interface);

1188

if(if_index == 0){

1189

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

1190

exitcode = EXIT_FAILURE;

1191

goto end;

1192

}

1065

1193

}

1066

1194

1067

1195

if(connect_to != NULL){

1074

1202

goto end;

1075

1203

}

1076

1204

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'){

1205

errno = 0;

1206

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

1207

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

1208

or tmpmax != (uint16_t)tmpmax){

1080

1209

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

1081

1210

exitcode = EXIT_FAILURE;

1082

1211

goto end;

1084

1213

port = (uint16_t)tmpmax;

1085

1214

*address = '\0';

1086

1215

address = connect_to;

1087

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

1216

/* Colon in address indicates IPv6 */

1217

int af;

1218

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

1219

af = AF_INET6;

1220

} else {

1221

af = AF_INET;

1222

}

1223

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

1088

1224

if(ret < 0){

1089

1225

exitcode = EXIT_FAILURE;

1090

1226

} else {

1092

1228

}

1093

1229

goto end;

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

1233

AvahiServerConfig config;

1113

1234

/* Do not publish any local Zeroconf records */

1137

1258

/* Create the Avahi service browser */

1138

1259

sb = avahi_s_service_browser_new(mc.server, if_index,

1139

1260

AVAHI_PROTO_INET6, "_mandos._tcp",

1140

NULL, 0, browse_callback, &mc);

1261

NULL, 0, browse_callback, NULL);

1141

1262

if(sb == NULL){

1142

1263

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

1143

1264

avahi_strerror(avahi_server_errno(mc.server)));