/mandos/trunk : revision 505.2.2

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

26

* along with this program. If not, see

27

* <http://www.gnu.org/licenses/>.

28

*

29

* Contact the authors at <mandos@fukt.bsnet.se>.

29

* Contact the authors at <mandos@recompile.se>.

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

39

43

stdout, ferror(), remove() */

40

44

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

41

45

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

42

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

43

srand(), strtof() */

46

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

47

strtof(), abort() */

44

48

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

45

49

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

46

50

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

58

62

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

59

63

strtoimax() */

60

64

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

61

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

62

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

65

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

66

program_invocation_short_name */

67

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

63

68

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

64

69

SIOCSIFFLAGS, if_indextoname(),

65

70

if_nametoindex(), IF_NAMESIZE */

67

72

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

68

73

*/

69

74

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

70

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

71

setgid() */

72

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

75

getuid(), getgid(), seteuid(),

76

setgid(), pause() */

77

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

73

78

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

74

79

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

75

80

argp_state, struct argp,

76

81

argp_parse(), ARGP_KEY_ARG,

77

82

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

78

83

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

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

84

sigaction(), SIGTERM, sig_atomic_t,

85

raise() */

86

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

81

88

82

89

#ifdef __linux__

83

90

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

120

127

bool debug = false;

121

128

static const char mandos_protocol_version[] = "1";

122

129

const char *argp_program_version = "mandos-client " VERSION;

123

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

130

const char *argp_program_bug_address = "<mandos@recompile.se>";

131

static const char sys_class_net[] = "/sys/class/net";

132

char *connect_to = NULL;

133

134

/* Doubly linked list that need to be circularly linked when used */

135

typedef struct server{

136

const char *ip;

137

uint16_t port;

138

AvahiIfIndex if_index;

139

int af;

140

struct timespec last_seen;

141

struct server *next;

142

struct server *prev;

143

} server;

124

144

125

145

/* Used for passing in values through the Avahi callback functions */

126

146

typedef struct {

131

151

gnutls_dh_params_t dh_params;

132

152

const char *priority;

133

153

gpgme_ctx_t ctx;

154

server *current_server;

134

155

} mandos_context;

135

156

136

157

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

137

158

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

138

159

.dh_bits = 1024, .priority = "SECURE256"

139

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

160

":!CTYPE-X.509:+CTYPE-OPENPGP",

161

.current_server = NULL };

162

163

sig_atomic_t quit_now = 0;

164

int signal_received = 0;

165

166

/* Function to use when printing errors */

167

void perror_plus(const char *print_text){

168

fprintf(stderr, "Mandos plugin %s: ",

169

program_invocation_short_name);

170

perror(print_text);

171

}

140

172

141

173

/*

142

174

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

155

187

return buffer_capacity;

156

188

}

157

189

190

/* Add server to set of servers to retry periodically */

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

194

int ret;

195

server *new_server = malloc(sizeof(server));

196

if(new_server == NULL){

197

perror_plus("malloc");

198

return -1;

199

}

200

*new_server = (server){ .ip = strdup(ip),

201

.port = port,

202

.if_index = if_index,

203

.af = af };

204

if(new_server->ip == NULL){

205

perror_plus("strdup");

206

return -1;

207

}

208

/* Special case of first server */

209

if (mc.current_server == NULL){

210

new_server->next = new_server;

211

new_server->prev = new_server;

212

mc.current_server = new_server;

213

/* Place the new server last in the list */

214

} else {

215

new_server->next = mc.current_server;

216

new_server->prev = mc.current_server->prev;

217

new_server->prev->next = new_server;

218

mc.current_server->prev = new_server;

219

}

220

ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

221

if(ret == -1){

222

perror_plus("clock_gettime");

223

return -1;

224

}

225

return 0;

226

}

227

158

228

/*

159

229

* Initialize GPGME.

160

230

*/

161

231

static bool init_gpgme(const char *seckey,

162

232

const char *pubkey, const char *tempdir){

163

int ret;

164

233

gpgme_error_t rc;

165

234

gpgme_engine_info_t engine_info;

166

235

169

238

* Helper function to insert pub and seckey to the engine keyring.

170

239

*/

171

240

bool import_key(const char *filename){

241

int ret;

172

242

int fd;

173

243

gpgme_data_t pgp_data;

174

244

175

245

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

176

246

if(fd == -1){

177

perror("open");

247

perror_plus("open");

178

248

return false;

179

249

}

180

250

194

264

195

265

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

196

266

if(ret == -1){

197

perror("close");

267

perror_plus("close");

198

268

}

199

269

gpgme_data_release(pgp_data);

200

270

return true;

213

283

return false;

214

284

}

215

285

216

/* Set GPGME home directory for the OpenPGP engine only */

286

/* Set GPGME home directory for the OpenPGP engine only */

217

287

rc = gpgme_get_engine_info(&engine_info);

218

288

if(rc != GPG_ERR_NO_ERROR){

219

289

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

245

315

return false;

246

316

}

247

317

248

return true;

318

return true;

249

319

}

250

320

251

321

/*

305

375

}

306

376

gpgme_recipient_t recipient;

307

377

recipient = result->recipients;

308

if(recipient){

309

while(recipient != NULL){

310

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

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

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

313

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

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

378

while(recipient != NULL){

379

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

380

gpgme_pubkey_algo_name(recipient->pubkey_algo));

381

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

382

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

383

recipient->status == GPG_ERR_NO_SECKEY

384

? "No" : "Yes");

385

recipient = recipient->next;

318

386

}

319

387

}

320

388

}

327

395

328

396

/* Seek back to the beginning of the GPGME plaintext data buffer */

329

397

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

330

perror("gpgme_data_seek");

398

perror_plus("gpgme_data_seek");

331

399

plaintext_length = -1;

332

400

goto decrypt_end;

333

401

}

338

406

(size_t)plaintext_length,

339

407

plaintext_capacity);

340

408

if(plaintext_capacity == 0){

341

perror("incbuffer");

409

perror_plus("incbuffer");

342

410

plaintext_length = -1;

343

411

goto decrypt_end;

344

412

}

351

419

break;

352

420

}

353

421

if(ret < 0){

354

perror("gpgme_data_read");

422

perror_plus("gpgme_data_read");

355

423

plaintext_length = -1;

356

424

goto decrypt_end;

357

425

}

414

482

}

415

483

416

484

/* OpenPGP credentials */

417

gnutls_certificate_allocate_credentials(&mc.cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

418

486

if(ret != GNUTLS_E_SUCCESS){

419

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

420

from

421

-Wunreachable-code

422

*/

487

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

423

488

safer_gnutls_strerror(ret));

424

489

gnutls_global_deinit();

425

490

return -1;

472

537

static int init_gnutls_session(gnutls_session_t *session){

473

538

int ret;

474

539

/* GnuTLS session creation */

475

ret = gnutls_init(session, GNUTLS_SERVER);

540

do {

541

ret = gnutls_init(session, GNUTLS_SERVER);

542

if(quit_now){

543

return -1;

544

}

545

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

476

546

if(ret != GNUTLS_E_SUCCESS){

477

547

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

478

548

safer_gnutls_strerror(ret));

480

550

481

551

{

482

552

const char *err;

483

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

553

do {

554

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

555

if(quit_now){

556

gnutls_deinit(*session);

557

return -1;

558

}

559

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

484

560

if(ret != GNUTLS_E_SUCCESS){

485

561

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

486

562

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

490

566

}

491

567

}

492

568

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

569

do {

570

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

571

mc.cred);

572

if(quit_now){

573

gnutls_deinit(*session);

574

return -1;

575

}

576

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

495

577

if(ret != GNUTLS_E_SUCCESS){

496

578

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

497

579

safer_gnutls_strerror(ret));

500

582

}

501

583

502

584

/* ignore client certificate if any. */

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

586

506

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

507

588

516

597

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

517

598

AvahiIfIndex if_index,

518

599

int af){

519

int ret, tcp_sd;

600

int ret, tcp_sd = -1;

520

601

ssize_t sret;

521

602

union {

522

603

struct sockaddr_in in;

523

604

struct sockaddr_in6 in6;

524

605

} to;

525

606

char *buffer = NULL;

526

char *decrypted_buffer;

607

char *decrypted_buffer = NULL;

527

608

size_t buffer_length = 0;

528

609

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

530

610

size_t written;

531

int retval = 0;

611

int retval = -1;

532

612

gnutls_session_t session;

533

613

int pf; /* Protocol family */

534

614

615

errno = 0;

616

617

if(quit_now){

618

errno = EINTR;

619

return -1;

620

}

621

535

622

switch(af){

536

623

case AF_INET6:

537

624

pf = PF_INET6;

541

628

break;

542

629

default:

543

630

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

631

errno = EINVAL;

544

632

return -1;

545

633

}

546

634

556

644

557

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

558

646

if(tcp_sd < 0){

559

perror("socket");

560

return -1;

647

int e = errno;

648

perror_plus("socket");

649

errno = e;

650

goto mandos_end;

651

}

652

653

if(quit_now){

654

errno = EINTR;

655

goto mandos_end;

561

656

}

562

657

563

658

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

564

659

if(af == AF_INET6){

565

to.in6.sin6_family = (uint16_t)af;

660

to.in6.sin6_family = (sa_family_t)af;

566

661

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

567

662

} else { /* IPv4 */

568

663

to.in.sin_family = (sa_family_t)af;

569

664

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

570

665

}

571

666

if(ret < 0 ){

572

perror("inet_pton");

573

return -1;

667

int e = errno;

668

perror_plus("inet_pton");

669

errno = e;

670

goto mandos_end;

574

671

}

575

672

if(ret == 0){

673

int e = errno;

576

674

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

577

return -1;

675

errno = e;

676

goto mandos_end;

578

677

}

579

678

if(af == AF_INET6){

580

679

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

587

686

if(if_index == AVAHI_IF_UNSPEC){

588

687

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

589

688

" without a network interface\n");

590

return -1;

689

errno = EINVAL;

690

goto mandos_end;

591

691

}

592

692

/* Set the network interface number as scope */

593

693

to.in6.sin6_scope_id = (uint32_t)if_index;

598

698

-Wunreachable-code */

599

699

}

600

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

704

}

705

601

706

if(debug){

602

707

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

603

708

char interface[IF_NAMESIZE];

604

709

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

605

perror("if_indextoname");

710

perror_plus("if_indextoname");

606

711

} else {

607

712

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

608

713

ip, interface, port);

622

727

sizeof(addrstr));

623

728

}

624

729

if(pcret == NULL){

625

perror("inet_ntop");

730

perror_plus("inet_ntop");

626

731

} else {

627

732

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

628

733

fprintf(stderr, "Canonical address form: %s\n", addrstr);

630

735

}

631

736

}

632

737

738

if(quit_now){

739

errno = EINTR;

740

goto mandos_end;

741

}

742

633

743

if(af == AF_INET6){

634

744

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

635

745

} else {

636

746

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

637

747

}

638

748

if(ret < 0){

639

perror("connect");

640

return -1;

749

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

750

int e = errno;

751

perror_plus("connect");

752

errno = e;

753

}

754

goto mandos_end;

755

}

756

757

if(quit_now){

758

errno = EINTR;

759

goto mandos_end;

641

760

}

642

761

643

762

const char *out = mandos_protocol_version;

647

766

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

648

767

out_size - written));

649

768

if(ret == -1){

650

perror("write");

651

retval = -1;

769

int e = errno;

770

perror_plus("write");

771

errno = e;

652

772

goto mandos_end;

653

773

}

654

774

written += (size_t)ret;

662

782

break;

663

783

}

664

784

}

785

786

if(quit_now){

787

errno = EINTR;

788

goto mandos_end;

789

}

665

790

}

666

791

667

792

if(debug){

668

793

fprintf(stderr, "Establishing TLS session with %s\n", ip);

669

794

}

670

795

796

if(quit_now){

797

errno = EINTR;

798

goto mandos_end;

799

}

800

801

/* Spurious warning from -Wint-to-pointer-cast */

671

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

672

803

673

do{

804

if(quit_now){

805

errno = EINTR;

806

goto mandos_end;

807

}

808

809

do {

674

810

ret = gnutls_handshake(session);

811

if(quit_now){

812

errno = EINTR;

813

goto mandos_end;

814

}

675

815

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

676

816

677

817

if(ret != GNUTLS_E_SUCCESS){

679

819

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

680

820

gnutls_perror(ret);

681

821

}

682

retval = -1;

822

errno = EPROTO;

683

823

goto mandos_end;

684

824

}

685

825

691

831

}

692

832

693

833

while(true){

834

835

if(quit_now){

836

errno = EINTR;

837

goto mandos_end;

838

}

839

694

840

buffer_capacity = incbuffer(&buffer, buffer_length,

695

841

buffer_capacity);

696

842

if(buffer_capacity == 0){

697

perror("incbuffer");

698

retval = -1;

843

int e = errno;

844

perror_plus("incbuffer");

845

errno = e;

846

goto mandos_end;

847

}

848

849

if(quit_now){

850

errno = EINTR;

699

851

goto mandos_end;

700

852

}

701

853

710

862

case GNUTLS_E_AGAIN:

711

863

break;

712

864

case GNUTLS_E_REHANDSHAKE:

713

do{

865

do {

714

866

ret = gnutls_handshake(session);

867

868

if(quit_now){

869

errno = EINTR;

870

goto mandos_end;

871

}

715

872

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

716

873

if(ret < 0){

717

874

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

718

875

gnutls_perror(ret);

719

retval = -1;

876

errno = EPROTO;

720

877

goto mandos_end;

721

878

}

722

879

break;

723

880

default:

724

881

fprintf(stderr, "Unknown error while reading data from"

725

882

" encrypted session with Mandos server\n");

726

retval = -1;

727

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

errno = EIO;

728

885

goto mandos_end;

729

886

}

730

887

} else {

736

893

fprintf(stderr, "Closing TLS session\n");

737

894

}

738

895

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

896

if(quit_now){

897

errno = EINTR;

898

goto mandos_end;

899

}

900

901

do {

902

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

903

if(quit_now){

904

errno = EINTR;

905

goto mandos_end;

906

}

907

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

740

908

741

909

if(buffer_length > 0){

910

ssize_t decrypted_buffer_size;

742

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

912

buffer_length,

744

913

&decrypted_buffer);

745

914

if(decrypted_buffer_size >= 0){

915

746

916

written = 0;

747

917

while(written < (size_t) decrypted_buffer_size){

918

if(quit_now){

919

errno = EINTR;

920

goto mandos_end;

921

}

922

748

923

ret = (int)fwrite(decrypted_buffer + written, 1,

749

924

(size_t)decrypted_buffer_size - written,

750

925

stdout);

751

926

if(ret == 0 and ferror(stdout)){

927

int e = errno;

752

928

if(debug){

753

929

fprintf(stderr, "Error writing encrypted data: %s\n",

754

930

strerror(errno));

755

931

}

756

retval = -1;

757

break;

932

errno = e;

933

goto mandos_end;

758

934

}

759

935

written += (size_t)ret;

760

936

}

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

937

retval = 0;

764

938

}

765

} else {

766

retval = -1;

767

939

}

768

940

769

941

/* Shutdown procedure */

770

942

771

943

mandos_end:

772

free(buffer);

773

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

774

if(ret == -1){

775

perror("close");

944

{

945

int e = errno;

946

free(decrypted_buffer);

947

free(buffer);

948

if(tcp_sd >= 0){

949

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

950

}

951

if(ret == -1){

952

if(e == 0){

953

e = errno;

954

}

955

perror_plus("close");

956

}

957

gnutls_deinit(session);

958

errno = e;

959

if(quit_now){

960

errno = EINTR;

961

retval = -1;

962

}

776

963

}

777

gnutls_deinit(session);

778

964

return retval;

779

965

}

780

966

797

983

/* Called whenever a service has been resolved successfully or

798

984

timed out */

799

985

986

if(quit_now){

987

return;

988

}

989

800

990

switch(event){

801

991

default:

802

992

case AVAHI_RESOLVER_FAILURE:

818

1008

avahi_proto_to_af(proto));

819

1009

if(ret == 0){

820

1010

avahi_simple_poll_quit(mc.simple_poll);

1011

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

821

1014

}

822

1015

}

823

1016

}

839

1032

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

840

1033

is removed from the LAN */

841

1034

1035

if(quit_now){

1036

return;

1037

}

1038

842

1039

switch(event){

843

1040

default:

844

1041

case AVAHI_BROWSER_FAILURE:

873

1070

}

874

1071

}

875

1072

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){

1073

/* Signal handler that stops main loop after SIGTERM */

1074

static void handle_sigterm(int sig){

880

1075

if(quit_now){

881

1076

return;

882

1077

}

883

1078

quit_now = 1;

1079

signal_received = sig;

884

1080

int old_errno = errno;

1081

/* set main loop to exit */

885

1082

if(mc.simple_poll != NULL){

886

1083

avahi_simple_poll_quit(mc.simple_poll);

887

1084

}

888

1085

errno = old_errno;

889

1086

}

890

1087

1088

bool get_flags(const char *ifname, struct ifreq *ifr){

1089

int ret;

1090

1091

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1092

if(s < 0){

1093

perror_plus("socket");

1094

return false;

1095

}

1096

strcpy(ifr->ifr_name, ifname);

1097

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1098

if(ret == -1){

1099

if(debug){

1100

perror_plus("ioctl SIOCGIFFLAGS");

1101

}

1102

return false;

1103

}

1104

return true;

1105

}

1106

1107

bool good_flags(const char *ifname, const struct ifreq *ifr){

1108

1109

/* Reject the loopback device */

1110

if(ifr->ifr_flags & IFF_LOOPBACK){

1111

if(debug){

1112

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1113

ifname);

1114

}

1115

return false;

1116

}

1117

/* Accept point-to-point devices only if connect_to is specified */

1118

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1119

if(debug){

1120

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1121

ifname);

1122

}

1123

return true;

1124

}

1125

/* Otherwise, reject non-broadcast-capable devices */

1126

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1127

if(debug){

1128

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1129

ifname);

1130

}

1131

return false;

1132

}

1133

/* Reject non-ARP interfaces (including dummy interfaces) */

1134

if(ifr->ifr_flags & IFF_NOARP){

1135

if(debug){

1136

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);

1137

}

1138

return false;

1139

}

1140

1141

/* Accept this device */

1142

if(debug){

1143

fprintf(stderr, "Interface \"%s\" is good\n", ifname);

1144

}

1145

return true;

1146

}

1147

1148

/*

1149

* This function determines if a directory entry in /sys/class/net

1150

* corresponds to an acceptable network device.

1151

* (This function is passed to scandir(3) as a filter function.)

1152

*/

1153

int good_interface(const struct dirent *if_entry){

1154

int ret;

1155

if(if_entry->d_name[0] == '.'){

1156

return 0;

1157

}

1158

struct ifreq ifr;

1159

1160

if(not get_flags(if_entry->d_name, &ifr)){

1161

return 0;

1162

}

1163

1164

if(not good_flags(if_entry->d_name, &ifr)){

1165

return 0;

1166

}

1167

return 1;

1168

}

1169

1170

int notdotentries(const struct dirent *direntry){

1171

/* Skip "." and ".." */

1172

if(direntry->d_name[0] == '.'

1173

and (direntry->d_name[1] == '\0'

1174

or (direntry->d_name[1] == '.'

1175

and direntry->d_name[2] == '\0'))){

1176

return 0;

1177

}

1178

return 1;

1179

}

1180

1181

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1182

int ret;

1183

struct timespec now;

1184

struct timespec waited_time;

1185

intmax_t block_time;

1186

1187

while(true){

1188

if(mc.current_server == NULL){

1189

if (debug){

1190

fprintf(stderr,

1191

"Wait until first server is found. No timeout!\n");

1192

}

1193

ret = avahi_simple_poll_iterate(s, -1);

1194

} else {

1195

if (debug){

1196

fprintf(stderr, "Check current_server if we should run it,"

1197

" or wait\n");

1198

}

1199

/* the current time */

1200

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1201

if(ret == -1){

1202

perror_plus("clock_gettime");

1203

return -1;

1204

}

1205

/* Calculating in ms how long time between now and server

1206

who we visted longest time ago. Now - last seen. */

1207

waited_time.tv_sec = (now.tv_sec

1208

- mc.current_server->last_seen.tv_sec);

1209

waited_time.tv_nsec = (now.tv_nsec

1210

- mc.current_server->last_seen.tv_nsec);

1211

/* total time is 10s/10,000ms.

1212

Converting to s from ms by dividing by 1,000,

1213

and ns to ms by dividing by 1,000,000. */

1214

block_time = ((retry_interval

1215

- ((intmax_t)waited_time.tv_sec * 1000))

1216

- ((intmax_t)waited_time.tv_nsec / 1000000));

1217

1218

if (debug){

1219

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1220

}

1221

1222

if(block_time <= 0){

1223

ret = start_mandos_communication(mc.current_server->ip,

1224

mc.current_server->port,

1225

mc.current_server->if_index,

1226

mc.current_server->af);

1227

if(ret == 0){

1228

avahi_simple_poll_quit(mc.simple_poll);

1229

return 0;

1230

}

1231

ret = clock_gettime(CLOCK_MONOTONIC,

1232

&mc.current_server->last_seen);

1233

if(ret == -1){

1234

perror_plus("clock_gettime");

1235

return -1;

1236

}

1237

mc.current_server = mc.current_server->next;

1238

block_time = 0; /* Call avahi to find new Mandos

1239

servers, but don't block */

1240

}

1241

1242

ret = avahi_simple_poll_iterate(s, (int)block_time);

1243

}

1244

if(ret != 0){

1245

if (ret > 0 or errno != EINTR) {

1246

return (ret != 1) ? ret : 0;

1247

}

1248

}

1249

}

1250

}

1251

891

1252

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

892

1253

AvahiSServiceBrowser *sb = NULL;

893

1254

int error;

895

1256

intmax_t tmpmax;

896

1257

char *tmp;

897

1258

int exitcode = EXIT_SUCCESS;

898

const char *interface = "eth0";

1259

const char *interface = "";

899

1260

struct ifreq network;

900

int sd;

1261

int sd = -1;

1262

bool take_down_interface = false;

901

1263

uid_t uid;

902

1264

gid_t gid;

903

char *connect_to = NULL;

904

1265

char tempdir[] = "/tmp/mandosXXXXXX";

905

1266

bool tempdir_created = false;

906

1267

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

910

1271

bool gnutls_initialized = false;

911

1272

bool gpgme_initialized = false;

912

1273

float delay = 2.5f;

1274

double retry_interval = 10; /* 10s between trying a server and

1275

retrying the same server again */

913

1276

914

struct sigaction old_sigterm_action;

1277

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

915

1278

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

916

1279

1280

uid = getuid();

1281

gid = getgid();

1282

1283

/* Lower any group privileges we might have, just to be safe */

1284

errno = 0;

1285

ret = setgid(gid);

1286

if(ret == -1){

1287

perror_plus("setgid");

1288

}

1289

1290

/* Lower user privileges (temporarily) */

1291

errno = 0;

1292

ret = seteuid(uid);

1293

if(ret == -1){

1294

perror_plus("seteuid");

1295

}

1296

1297

if(quit_now){

1298

goto end;

1299

}

1300

917

1301

{

918

1302

struct argp_option options[] = {

919

1303

{ .name = "debug", .key = 128,

948

1332

.arg = "SECONDS",

949

1333

.doc = "Maximum delay to wait for interface startup",

950

1334

.group = 2 },

1335

{ .name = "retry", .key = 132,

1336

.arg = "SECONDS",

1337

.doc = "Retry interval used when denied by the mandos server",

1338

.group = 2 },

1339

/*

1340

* These reproduce what we would get without ARGP_NO_HELP

1341

*/

1342

{ .name = "help", .key = '?',

1343

.doc = "Give this help list", .group = -1 },

1344

{ .name = "usage", .key = -3,

1345

.doc = "Give a short usage message", .group = -1 },

1346

{ .name = "version", .key = 'V',

1347

.doc = "Print program version", .group = -1 },

951

1348

{ .name = NULL }

952

1349

};

953

1350

954

1351

error_t parse_opt(int key, char *arg,

955

1352

struct argp_state *state){

1353

errno = 0;

956

1354

switch(key){

957

1355

case 128: /* --debug */

958

1356

debug = true;

974

1372

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

975

1373

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

976

1374

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

977

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

978

exit(EXIT_FAILURE);

1375

argp_error(state, "Bad number of DH bits");

979

1376

}

980

1377

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

981

1378

break;

986

1383

errno = 0;

987

1384

delay = strtof(arg, &tmp);

988

1385

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

989

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

990

exit(EXIT_FAILURE);

1386

argp_error(state, "Bad delay");

1387

}

1388

case 132: /* --retry */

1389

errno = 0;

1390

retry_interval = strtod(arg, &tmp);

1391

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

1392

or (retry_interval * 1000) > INT_MAX

1393

or retry_interval < 0){

1394

argp_error(state, "Bad retry interval");

991

1395

}

992

1396

break;

993

case ARGP_KEY_ARG:

994

argp_usage(state);

995

case ARGP_KEY_END:

1397

/*

1398

* These reproduce what we would get without ARGP_NO_HELP

1399

*/

1400

case '?': /* --help */

1401

argp_state_help(state, state->out_stream,

1402

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1403

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1404

case -3: /* --usage */

1405

argp_state_help(state, state->out_stream,

1406

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1407

case 'V': /* --version */

1408

fprintf(state->out_stream, "%s\n", argp_program_version);

1409

exit(argp_err_exit_status);

996

1410

break;

997

1411

default:

998

1412

return ARGP_ERR_UNKNOWN;

999

1413

}

1000

return 0;

1414

return errno;

1001

1415

}

1002

1416

1003

1417

struct argp argp = { .options = options, .parser = parse_opt,

1004

1418

.args_doc = "",

1005

1419

.doc = "Mandos client -- Get and decrypt"

1006

1420

" passwords from a Mandos server" };

1007

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1008

if(ret == ARGP_ERR_UNKNOWN){

1009

fprintf(stderr, "Unknown error while parsing arguments\n");

1010

exitcode = EXIT_FAILURE;

1011

goto end;

1421

ret = argp_parse(&argp, argc, argv,

1422

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1423

switch(ret){

1424

case 0:

1425

break;

1426

case ENOMEM:

1427

default:

1428

errno = ret;

1429

perror_plus("argp_parse");

1430

exitcode = EX_OSERR;

1431

goto end;

1432

case EINVAL:

1433

exitcode = EX_USAGE;

1434

goto end;

1435

}

1436

}

1437

1438

{

1439

/* Work around Debian bug #633582:

1440

<http://bugs.debian.org/633582> */

1441

struct stat st;

1442

1443

/* Re-raise priviliges */

1444

errno = 0;

1445

ret = seteuid(0);

1446

if(ret == -1){

1447

perror_plus("seteuid");

1448

}

1449

1450

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1451

int seckey_fd = open(seckey, O_RDONLY);

1452

if(seckey_fd == -1){

1453

perror_plus("open");

1454

} else {

1455

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1456

if(ret == -1){

1457

perror_plus("fstat");

1458

} else {

1459

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1460

ret = fchown(seckey_fd, uid, gid);

1461

if(ret == -1){

1462

perror_plus("fchown");

1463

}

1464

}

1465

}

1466

TEMP_FAILURE_RETRY(close(seckey_fd));

1467

}

1468

}

1469

1470

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1471

int pubkey_fd = open(pubkey, O_RDONLY);

1472

if(pubkey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1480

ret = fchown(pubkey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(pubkey_fd));

1487

}

1488

}

1489

1490

/* Lower privileges */

1491

errno = 0;

1492

ret = seteuid(uid);

1493

if(ret == -1){

1494

perror_plus("seteuid");

1012

1495

}

1013

1496

}

1014

1497

1015

1498

if(not debug){

1016

1499

avahi_set_log_function(empty_log);

1017

1500

}

1501

1502

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

1503

struct dirent **direntries;

1504

ret = scandir(sys_class_net, &direntries, good_interface,

1505

alphasort);

1506

if(ret >= 1){

1507

/* Pick the first good interface */

1508

interface = strdup(direntries[0]->d_name);

1509

if(debug){

1510

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

1511

}

1512

if(interface == NULL){

1513

perror_plus("malloc");

1514

free(direntries);

1515

exitcode = EXIT_FAILURE;

1516

goto end;

1517

}

1518

free(direntries);

1519

} else {

1520

free(direntries);

1521

fprintf(stderr, "Could not find a network interface\n");

1522

exitcode = EXIT_FAILURE;

1523

goto end;

1524

}

1525

}

1018

1526

1019

1527

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

1020

1528

from the signal handler */

1023

1531

mc.simple_poll = avahi_simple_poll_new();

1024

1532

if(mc.simple_poll == NULL){

1025

1533

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

1026

exitcode = EXIT_FAILURE;

1534

exitcode = EX_UNAVAILABLE;

1027

1535

goto end;

1028

1536

}

1029

1537

1030

1538

sigemptyset(&sigterm_action.sa_mask);

1031

1539

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

1032

1540

if(ret == -1){

1033

perror("sigaddset");

1034

exitcode = EXIT_FAILURE;

1541

perror_plus("sigaddset");

1542

exitcode = EX_OSERR;

1035

1543

goto end;

1036

1544

}

1037

1545

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

1038

1546

if(ret == -1){

1039

perror("sigaddset");

1040

exitcode = EXIT_FAILURE;

1547

perror_plus("sigaddset");

1548

exitcode = EX_OSERR;

1041

1549

goto end;

1042

1550

}

1043

1551

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

1044

1552

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

}

1553

perror_plus("sigaddset");

1554

exitcode = EX_OSERR;

1555

goto end;

1556

}

1557

/* Need to check if the handler is SIG_IGN before handling:

1558

| [[info:libc:Initial Signal Actions]] |

1559

| [[info:libc:Basic Signal Handling]] |

1560

*/

1561

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1562

if(ret == -1){

1563

perror_plus("sigaction");

1564

return EX_OSERR;

1565

}

1566

if(old_sigterm_action.sa_handler != SIG_IGN){

1567

ret = sigaction(SIGINT, &sigterm_action, NULL);

1568

if(ret == -1){

1569

perror_plus("sigaction");

1570

exitcode = EX_OSERR;

1571

goto end;

1572

}

1573

}

1574

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1575

if(ret == -1){

1576

perror_plus("sigaction");

1577

return EX_OSERR;

1578

}

1579

if(old_sigterm_action.sa_handler != SIG_IGN){

1580

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1581

if(ret == -1){

1582

perror_plus("sigaction");

1583

exitcode = EX_OSERR;

1584

goto end;

1585

}

1586

}

1587

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

1588

if(ret == -1){

1589

perror_plus("sigaction");

1590

return EX_OSERR;

1591

}

1592

if(old_sigterm_action.sa_handler != SIG_IGN){

1593

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

1594

if(ret == -1){

1595

perror_plus("sigaction");

1596

exitcode = EX_OSERR;

1597

goto end;

1598

}

1599

}

1055

1600

1056

1601

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

1057

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

1602

if(strcmp(interface, "none") != 0){

1603

if_index = (AvahiIfIndex) if_nametoindex(interface);

1604

if(if_index == 0){

1605

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

1606

exitcode = EX_UNAVAILABLE;

1607

goto end;

1608

}

1609

1610

if(quit_now){

1611

goto end;

1612

}

1613

1614

/* Re-raise priviliges */

1615

errno = 0;

1616

ret = seteuid(0);

1617

if(ret == -1){

1618

perror_plus("seteuid");

1619

}

1620

1058

1621

#ifdef __linux__

1059

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1060

messages to mess up the prompt */

1623

messages about the network interface to mess up the prompt */

1061

1624

ret = klogctl(8, NULL, 5);

1062

1625

bool restore_loglevel = true;

1063

1626

if(ret == -1){

1064

1627

restore_loglevel = false;

1065

perror("klogctl");

1628

perror_plus("klogctl");

1066

1629

}

1067

1630

#endif /* __linux__ */

1068

1631

1069

1632

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1070

1633

if(sd < 0){

1071

perror("socket");

1072

exitcode = EXIT_FAILURE;

1634

perror_plus("socket");

1635

exitcode = EX_OSERR;

1073

1636

#ifdef __linux__

1074

1637

if(restore_loglevel){

1075

1638

ret = klogctl(7, NULL, 0);

1076

1639

if(ret == -1){

1077

perror("klogctl");

1640

perror_plus("klogctl");

1078

1641

}

1079

1642

}

1080

1643

#endif /* __linux__ */

1644

/* Lower privileges */

1645

errno = 0;

1646

ret = seteuid(uid);

1647

if(ret == -1){

1648

perror_plus("seteuid");

1649

}

1081

1650

goto end;

1082

1651

}

1083

1652

strcpy(network.ifr_name, interface);

1084

1653

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

1085

1654

if(ret == -1){

1086

perror("ioctl SIOCGIFFLAGS");

1655

perror_plus("ioctl SIOCGIFFLAGS");

1087

1656

#ifdef __linux__

1088

1657

if(restore_loglevel){

1089

1658

ret = klogctl(7, NULL, 0);

1090

1659

if(ret == -1){

1091

perror("klogctl");

1660

perror_plus("klogctl");

1092

1661

}

1093

1662

}

1094

1663

#endif /* __linux__ */

1095

exitcode = EXIT_FAILURE;

1664

exitcode = EX_OSERR;

1665

/* Lower privileges */

1666

errno = 0;

1667

ret = seteuid(uid);

1668

if(ret == -1){

1669

perror_plus("seteuid");

1670

}

1096

1671

goto end;

1097

1672

}

1098

1673

if((network.ifr_flags & IFF_UP) == 0){

1099

1674

network.ifr_flags |= IFF_UP;

1675

take_down_interface = true;

1100

1676

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

1101

1677

if(ret == -1){

1102

perror("ioctl SIOCSIFFLAGS");

1103

exitcode = EXIT_FAILURE;

1678

take_down_interface = false;

1679

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1680

exitcode = EX_OSERR;

1104

1681

#ifdef __linux__

1105

1682

if(restore_loglevel){

1106

1683

ret = klogctl(7, NULL, 0);

1107

1684

if(ret == -1){

1108

perror("klogctl");

1685

perror_plus("klogctl");

1109

1686

}

1110

1687

}

1111

1688

#endif /* __linux__ */

1689

/* Lower privileges */

1690

errno = 0;

1691

ret = seteuid(uid);

1692

if(ret == -1){

1693

perror_plus("seteuid");

1694

}

1112

1695

goto end;

1113

1696

}

1114

1697

}

1115

/* sleep checking until interface is running */

1698

/* Sleep checking until interface is running.

1699

Check every 0.25s, up to total time of delay */

1116

1700

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

1117

1701

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

1118

1702

if(ret == -1){

1119

perror("ioctl SIOCGIFFLAGS");

1703

perror_plus("ioctl SIOCGIFFLAGS");

1120

1704

} else if(network.ifr_flags & IFF_RUNNING){

1121

1705

break;

1122

1706

}

1123

1707

struct timespec sleeptime = { .tv_nsec = 250000000 };

1124

1708

ret = nanosleep(&sleeptime, NULL);

1125

1709

if(ret == -1 and errno != EINTR){

1126

perror("nanosleep");

1710

perror_plus("nanosleep");

1127

1711

}

1128

1712

}

1129

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

1130

if(ret == -1){

1131

perror("close");

1713

if(not take_down_interface){

1714

/* We won't need the socket anymore */

1715

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

1716

if(ret == -1){

1717

perror_plus("close");

1718

}

1132

1719

}

1133

1720

#ifdef __linux__

1134

1721

if(restore_loglevel){

1135

1722

/* Restores kernel loglevel to default */

1136

1723

ret = klogctl(7, NULL, 0);

1137

1724

if(ret == -1){

1138

perror("klogctl");

1725

perror_plus("klogctl");

1139

1726

}

1140

1727

}

1141

1728

#endif /* __linux__ */

1142

}

1143

1144

uid = getuid();

1145

gid = getgid();

1146

1147

errno = 0;

1148

setgid(gid);

1149

if(ret == -1){

1150

perror("setgid");

1151

}

1152

1153

ret = setuid(uid);

1154

if(ret == -1){

1155

perror("setuid");

1729

/* Lower privileges */

1730

errno = 0;

1731

if(take_down_interface){

1732

/* Lower privileges */

1733

ret = seteuid(uid);

1734

if(ret == -1){

1735

perror_plus("seteuid");

1736

}

1737

} else {

1738

/* Lower privileges permanently */

1739

ret = setuid(uid);

1740

if(ret == -1){

1741

perror_plus("setuid");

1742

}

1743

}

1744

}

1745

1746

if(quit_now){

1747

goto end;

1156

1748

}

1157

1749

1158

1750

ret = init_gnutls_global(pubkey, seckey);

1159

1751

if(ret == -1){

1160

1752

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

1161

exitcode = EXIT_FAILURE;

1753

exitcode = EX_UNAVAILABLE;

1162

1754

goto end;

1163

1755

} else {

1164

1756

gnutls_initialized = true;

1165

1757

}

1166

1758

1759

if(quit_now){

1760

goto end;

1761

}

1762

1167

1763

if(mkdtemp(tempdir) == NULL){

1168

perror("mkdtemp");

1764

perror_plus("mkdtemp");

1169

1765

goto end;

1170

1766

}

1171

1767

tempdir_created = true;

1172

1768

1769

if(quit_now){

1770

goto end;

1771

}

1772

1173

1773

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

1174

1774

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

1175

exitcode = EXIT_FAILURE;

1775

exitcode = EX_UNAVAILABLE;

1176

1776

goto end;

1177

1777

} else {

1178

1778

gpgme_initialized = true;

1179

1779

}

1180

1780

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

}

1781

if(quit_now){

1782

goto end;

1188

1783

}

1189

1784

1190

1785

if(connect_to != NULL){

1193

1788

char *address = strrchr(connect_to, ':');

1194

1789

if(address == NULL){

1195

1790

fprintf(stderr, "No colon in address\n");

1196

exitcode = EXIT_FAILURE;

1197

goto end;

1198

}

1791

exitcode = EX_USAGE;

1792

goto end;

1793

}

1794

1795

if(quit_now){

1796

goto end;

1797

}

1798

1199

1799

uint16_t port;

1200

1800

errno = 0;

1201

1801

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

1202

1802

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

1203

1803

or tmpmax != (uint16_t)tmpmax){

1204

1804

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

1205

exitcode = EXIT_FAILURE;

1206

goto end;

1207

}

1805

exitcode = EX_USAGE;

1806

goto end;

1807

}

1808

1809

if(quit_now){

1810

goto end;

1811

}

1812

1208

1813

port = (uint16_t)tmpmax;

1209

1814

*address = '\0';

1210

address = connect_to;

1211

1815

/* Colon in address indicates IPv6 */

1212

1816

int af;

1213

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

1817

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

1214

1818

af = AF_INET6;

1819

/* Accept [] around IPv6 address - see RFC 5952 */

1820

if(connect_to[0] == '[' and address[-1] == ']')

1821

{

1822

connect_to++;

1823

address[-1] = '\0';

1824

}

1215

1825

} else {

1216

1826

af = AF_INET;

1217

1827

}

1218

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

1219

if(ret < 0){

1220

exitcode = EXIT_FAILURE;

1221

} else {

1828

address = connect_to;

1829

1830

if(quit_now){

1831

goto end;

1832

}

1833

1834

while(not quit_now){

1835

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

1836

if(quit_now or ret == 0){

1837

break;

1838

}

1839

if(debug){

1840

fprintf(stderr, "Retrying in %d seconds\n",

1841

(int)retry_interval);

1842

}

1843

sleep((int)retry_interval);

1844

}

1845

1846

if (not quit_now){

1222

1847

exitcode = EXIT_SUCCESS;

1223

1848

}

1224

goto end;

1225

}

1226

1849

1850

goto end;

1851

}

1852

1853

if(quit_now){

1854

goto end;

1855

}

1856

1227

1857

{

1228

1858

AvahiServerConfig config;

1229

1859

/* Do not publish any local Zeroconf records */

1246

1876

if(mc.server == NULL){

1247

1877

fprintf(stderr, "Failed to create Avahi server: %s\n",

1248

1878

avahi_strerror(error));

1249

exitcode = EXIT_FAILURE;

1879

exitcode = EX_UNAVAILABLE;

1880

goto end;

1881

}

1882

1883

if(quit_now){

1250

1884

goto end;

1251

1885

}

1252

1886

1257

1891

if(sb == NULL){

1258

1892

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

1259

1893

avahi_strerror(avahi_server_errno(mc.server)));

1260

exitcode = EXIT_FAILURE;

1894

exitcode = EX_UNAVAILABLE;

1895

goto end;

1896

}

1897

1898

if(quit_now){

1261

1899

goto end;

1262

1900

}

1263

1901

1266

1904

if(debug){

1267

1905

fprintf(stderr, "Starting Avahi loop search\n");

1268

1906

}

1269

1270

avahi_simple_poll_loop(mc.simple_poll);

1907

1908

ret = avahi_loop_with_timeout(mc.simple_poll,

1909

(int)(retry_interval * 1000));

1910

if(debug){

1911

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

1912

(ret == 0) ? "successfully" : "with error");

1913

}

1271

1914

1272

1915

end:

1273

1916

1294

1937

if(gpgme_initialized){

1295

1938

gpgme_release(mc.ctx);

1296

1939

}

1297

1298

/* Removes the temp directory used by GPGME */

1940

1941

/* Cleans up the circular linked list of Mandos servers the client

1942

has seen */

1943

if(mc.current_server != NULL){

1944

mc.current_server->prev->next = NULL;

1945

while(mc.current_server != NULL){

1946

server *next = mc.current_server->next;

1947

free(mc.current_server);

1948

mc.current_server = next;

1949

}

1950

}

1951

1952

/* Take down the network interface */

1953

if(take_down_interface){

1954

/* Re-raise priviliges */

1955

errno = 0;

1956

ret = seteuid(0);

1957

if(ret == -1){

1958

perror_plus("seteuid");

1959

}

1960

if(geteuid() == 0){

1961

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

1962

if(ret == -1){

1963

perror_plus("ioctl SIOCGIFFLAGS");

1964

} else if(network.ifr_flags & IFF_UP) {

1965

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

1966

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

1967

if(ret == -1){

1968

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1969

}

1970

}

1971

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

1972

if(ret == -1){

1973

perror_plus("close");

1974

}

1975

/* Lower privileges permanently */

1976

errno = 0;

1977

ret = setuid(uid);

1978

if(ret == -1){

1979

perror_plus("setuid");

1980

}

1981

}

1982

}

1983

1984

/* Removes the GPGME temp directory and all files inside */

1299

1985

if(tempdir_created){

1300

DIR *d;

1301

struct dirent *direntry;

1302

d = opendir(tempdir);

1303

if(d == NULL){

1304

if(errno != ENOENT){

1305

perror("opendir");

1306

}

1307

} else {

1308

while(true){

1309

direntry = readdir(d);

1310

if(direntry == NULL){

1311

break;

1312

}

1313

/* Skip "." and ".." */

1314

if(direntry->d_name[0] == '.'

1315

and (direntry->d_name[1] == '\0'

1316

or (direntry->d_name[1] == '.'

1317

and direntry->d_name[2] == '\0'))){

1318

continue;

1319

}

1986

struct dirent **direntries = NULL;

1987

struct dirent *direntry = NULL;

1988

int numentries = scandir(tempdir, &direntries, notdotentries,

1989

alphasort);

1990

if (numentries > 0){

1991

for(int i = 0; i < numentries; i++){

1992

direntry = direntries[i];

1320

1993

char *fullname = NULL;

1321

1994

ret = asprintf(&fullname, "%s/%s", tempdir,

1322

1995

direntry->d_name);

1323

1996

if(ret < 0){

1324

perror("asprintf");

1997

perror_plus("asprintf");

1325

1998

continue;

1326

1999

}

1327

2000

ret = remove(fullname);

1331

2004

}

1332

2005

free(fullname);

1333

2006

}

1334

closedir(d);

2007

}

2008

2009

/* need to clean even if 0 because man page doesn't specify */

2010

free(direntries);

2011

if (numentries == -1){

2012

perror_plus("scandir");

1335

2013

}

1336

2014

ret = rmdir(tempdir);

1337

2015

if(ret == -1 and errno != ENOENT){

1338

perror("rmdir");

1339

}

2016

perror_plus("rmdir");

2017

}

2018

}

2019

2020

if(quit_now){

2021

sigemptyset(&old_sigterm_action.sa_mask);

2022

old_sigterm_action.sa_handler = SIG_DFL;

2023

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2024

&old_sigterm_action,

2025

NULL));

2026

if(ret == -1){

2027

perror_plus("sigaction");

2028

}

2029

do {

2030

ret = raise(signal_received);

2031

} while(ret != 0 and errno == EINTR);

2032

if(ret != 0){

2033

perror_plus("raise");

2034

abort();

2035

}

2036

TEMP_FAILURE_RETRY(pause());

1340

2037

}

1341

2038

1342

2039

return exitcode;