/mandos/release : revision 237.15.1

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() */

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

srand(), strtof() */

46

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

47

strtof(), abort() */

48

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

49

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

50

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

62

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

63

strtoimax() */

64

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

65

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

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

71

72

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

73

*/

73

74

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

74

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

75

setgid() */

76

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

75

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

76

setgid(), pause() */

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

80

81

argp_parse(), ARGP_KEY_ARG,

81

82

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

83

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

83

sigaction(), SIGTERM, sigaction,

84

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 */

85

88

86

89

#ifdef __linux__

87

90

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

124

127

bool debug = false;

125

128

static const char mandos_protocol_version[] = "1";

126

129

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

127

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;

128

144

129

145

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

130

146

typedef struct {

135

151

gnutls_dh_params_t dh_params;

136

152

const char *priority;

137

153

gpgme_ctx_t ctx;

154

server *current_server;

138

155

} mandos_context;

139

156

140

157

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

141

158

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

142

159

.dh_bits = 1024, .priority = "SECURE256"

143

":!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

}

144

172

145

173

/*

146

174

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

159

187

return buffer_capacity;

160

188

}

161

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

162

228

/*

163

229

* Initialize GPGME.

164

230

*/

165

231

static bool init_gpgme(const char *seckey,

166

232

const char *pubkey, const char *tempdir){

167

int ret;

168

233

gpgme_error_t rc;

169

234

gpgme_engine_info_t engine_info;

170

235

173

238

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

174

239

*/

175

240

bool import_key(const char *filename){

241

int ret;

176

242

int fd;

177

243

gpgme_data_t pgp_data;

178

244

179

245

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

180

246

if(fd == -1){

181

perror("open");

247

perror_plus("open");

182

248

return false;

183

249

}

184

250

198

264

199

265

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

200

266

if(ret == -1){

201

perror("close");

267

perror_plus("close");

202

268

}

203

269

gpgme_data_release(pgp_data);

204

270

return true;

217

283

return false;

218

284

}

219

285

220

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

286

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

221

287

rc = gpgme_get_engine_info(&engine_info);

222

288

if(rc != GPG_ERR_NO_ERROR){

223

289

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

249

315

return false;

250

316

}

251

317

252

return true;

318

return true;

253

319

}

254

320

255

321

/*

309

375

}

310

376

gpgme_recipient_t recipient;

311

377

recipient = result->recipients;

312

if(recipient){

313

while(recipient != NULL){

314

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

315

gpgme_pubkey_algo_name(recipient->pubkey_algo));

316

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

317

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

318

recipient->status == GPG_ERR_NO_SECKEY

319

? "No" : "Yes");

320

recipient = recipient->next;

321

}

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;

322

386

}

323

387

}

324

388

}

331

395

332

396

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

333

397

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

334

perror("gpgme_data_seek");

398

perror_plus("gpgme_data_seek");

335

399

plaintext_length = -1;

336

400

goto decrypt_end;

337

401

}

342

406

(size_t)plaintext_length,

343

407

plaintext_capacity);

344

408

if(plaintext_capacity == 0){

345

perror("incbuffer");

409

perror_plus("incbuffer");

346

410

plaintext_length = -1;

347

411

goto decrypt_end;

348

412

}

355

419

break;

356

420

}

357

421

if(ret < 0){

358

perror("gpgme_data_read");

422

perror_plus("gpgme_data_read");

359

423

plaintext_length = -1;

360

424

goto decrypt_end;

361

425

}

418

482

}

419

483

420

484

/* OpenPGP credentials */

421

gnutls_certificate_allocate_credentials(&mc.cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

422

486

if(ret != GNUTLS_E_SUCCESS){

423

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

424

from

425

-Wunreachable-code

426

*/

487

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

427

488

safer_gnutls_strerror(ret));

428

489

gnutls_global_deinit();

429

490

return -1;

476

537

static int init_gnutls_session(gnutls_session_t *session){

477

538

int ret;

478

539

/* GnuTLS session creation */

479

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);

480

546

if(ret != GNUTLS_E_SUCCESS){

481

547

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

482

548

safer_gnutls_strerror(ret));

484

550

485

551

{

486

552

const char *err;

487

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);

488

560

if(ret != GNUTLS_E_SUCCESS){

489

561

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

490

562

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

494

566

}

495

567

}

496

568

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

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);

499

577

if(ret != GNUTLS_E_SUCCESS){

500

578

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

501

579

safer_gnutls_strerror(ret));

504

582

}

505

583

506

584

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

586

510

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

588

520

597

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

521

598

AvahiIfIndex if_index,

522

599

int af){

523

int ret, tcp_sd;

600

int ret, tcp_sd = -1;

524

601

ssize_t sret;

525

602

union {

526

603

struct sockaddr_in in;

527

604

struct sockaddr_in6 in6;

528

605

} to;

529

606

char *buffer = NULL;

530

char *decrypted_buffer;

607

char *decrypted_buffer = NULL;

531

608

size_t buffer_length = 0;

532

609

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

610

size_t written;

535

int retval = 0;

611

int retval = -1;

536

612

gnutls_session_t session;

537

613

int pf; /* Protocol family */

538

614

615

errno = 0;

616

617

if(quit_now){

618

errno = EINTR;

619

return -1;

620

}

621

539

622

switch(af){

540

623

case AF_INET6:

541

624

pf = PF_INET6;

545

628

break;

546

629

default:

547

630

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

631

errno = EINVAL;

548

632

return -1;

549

633

}

550

634

560

644

561

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

646

if(tcp_sd < 0){

563

perror("socket");

564

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;

565

656

}

566

657

567

658

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

568

659

if(af == AF_INET6){

569

to.in6.sin6_family = (uint16_t)af;

660

to.in6.sin6_family = (sa_family_t)af;

570

661

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

571

662

} else { /* IPv4 */

572

663

to.in.sin_family = (sa_family_t)af;

573

664

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

574

665

}

575

666

if(ret < 0 ){

576

perror("inet_pton");

577

return -1;

667

int e = errno;

668

perror_plus("inet_pton");

669

errno = e;

670

goto mandos_end;

578

671

}

579

672

if(ret == 0){

673

int e = errno;

580

674

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

581

return -1;

675

errno = e;

676

goto mandos_end;

582

677

}

583

678

if(af == AF_INET6){

584

679

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

591

686

if(if_index == AVAHI_IF_UNSPEC){

592

687

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

593

688

" without a network interface\n");

594

return -1;

689

errno = EINVAL;

690

goto mandos_end;

595

691

}

596

692

/* Set the network interface number as scope */

597

693

to.in6.sin6_scope_id = (uint32_t)if_index;

602

698

-Wunreachable-code */

603

699

}

604

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

704

}

705

605

706

if(debug){

606

707

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

607

708

char interface[IF_NAMESIZE];

608

709

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

609

perror("if_indextoname");

710

perror_plus("if_indextoname");

610

711

} else {

611

712

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

612

713

ip, interface, port);

626

727

sizeof(addrstr));

627

728

}

628

729

if(pcret == NULL){

629

perror("inet_ntop");

730

perror_plus("inet_ntop");

630

731

} else {

631

732

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

632

733

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

634

735

}

635

736

}

636

737

738

if(quit_now){

739

errno = EINTR;

740

goto mandos_end;

741

}

742

637

743

if(af == AF_INET6){

638

744

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

639

745

} else {

640

746

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

641

747

}

642

748

if(ret < 0){

643

perror("connect");

644

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;

645

760

}

646

761

647

762

const char *out = mandos_protocol_version;

651

766

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

652

767

out_size - written));

653

768

if(ret == -1){

654

perror("write");

655

retval = -1;

769

int e = errno;

770

perror_plus("write");

771

errno = e;

656

772

goto mandos_end;

657

773

}

658

774

written += (size_t)ret;

666

782

break;

667

783

}

668

784

}

785

786

if(quit_now){

787

errno = EINTR;

788

goto mandos_end;

789

}

669

790

}

670

791

671

792

if(debug){

672

793

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

673

794

}

674

795

796

if(quit_now){

797

errno = EINTR;

798

goto mandos_end;

799

}

800

801

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

675

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

803

677

do{

804

if(quit_now){

805

errno = EINTR;

806

goto mandos_end;

807

}

808

809

do {

678

810

ret = gnutls_handshake(session);

811

if(quit_now){

812

errno = EINTR;

813

goto mandos_end;

814

}

679

815

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

680

816

681

817

if(ret != GNUTLS_E_SUCCESS){

683

819

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

684

820

gnutls_perror(ret);

685

821

}

686

retval = -1;

822

errno = EPROTO;

687

823

goto mandos_end;

688

824

}

689

825

695

831

}

696

832

697

833

while(true){

834

835

if(quit_now){

836

errno = EINTR;

837

goto mandos_end;

838

}

839

698

840

buffer_capacity = incbuffer(&buffer, buffer_length,

699

841

buffer_capacity);

700

842

if(buffer_capacity == 0){

701

perror("incbuffer");

702

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;

703

851

goto mandos_end;

704

852

}

705

853

714

862

case GNUTLS_E_AGAIN:

715

863

break;

716

864

case GNUTLS_E_REHANDSHAKE:

717

do{

865

do {

718

866

ret = gnutls_handshake(session);

867

868

if(quit_now){

869

errno = EINTR;

870

goto mandos_end;

871

}

719

872

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

720

873

if(ret < 0){

721

874

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

722

875

gnutls_perror(ret);

723

retval = -1;

876

errno = EPROTO;

724

877

goto mandos_end;

725

878

}

726

879

break;

727

880

default:

728

881

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

729

882

" encrypted session with Mandos server\n");

730

retval = -1;

731

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

errno = EIO;

732

885

goto mandos_end;

733

886

}

734

887

} else {

740

893

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

741

894

}

742

895

743

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);

744

908

745

909

if(buffer_length > 0){

910

ssize_t decrypted_buffer_size;

746

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

912

buffer_length,

748

913

&decrypted_buffer);

749

914

if(decrypted_buffer_size >= 0){

915

750

916

written = 0;

751

917

while(written < (size_t) decrypted_buffer_size){

918

if(quit_now){

919

errno = EINTR;

920

goto mandos_end;

921

}

922

752

923

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

753

924

(size_t)decrypted_buffer_size - written,

754

925

stdout);

755

926

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

927

int e = errno;

756

928

if(debug){

757

929

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

758

930

strerror(errno));

759

931

}

760

retval = -1;

761

break;

932

errno = e;

933

goto mandos_end;

762

934

}

763

935

written += (size_t)ret;

764

936

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

937

retval = 0;

768

938

}

769

} else {

770

retval = -1;

771

939

}

772

940

773

941

/* Shutdown procedure */

774

942

775

943

mandos_end:

776

free(buffer);

777

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

778

if(ret == -1){

779

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

}

780

963

}

781

gnutls_deinit(session);

782

964

return retval;

783

965

}

784

966

801

983

/* Called whenever a service has been resolved successfully or

802

984

timed out */

803

985

986

if(quit_now){

987

return;

988

}

989

804

990

switch(event){

805

991

default:

806

992

case AVAHI_RESOLVER_FAILURE:

822

1008

avahi_proto_to_af(proto));

823

1009

if(ret == 0){

824

1010

avahi_simple_poll_quit(mc.simple_poll);

1011

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

825

1014

}

826

1015

}

827

1016

}

843

1032

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

844

1033

is removed from the LAN */

845

1034

1035

if(quit_now){

1036

return;

1037

}

1038

846

1039

switch(event){

847

1040

default:

848

1041

case AVAHI_BROWSER_FAILURE:

877

1070

}

878

1071

}

879

1072

880

sig_atomic_t quit_now = 0;

881

882

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

883

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

1073

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

1074

static void handle_sigterm(int sig){

884

1075

if(quit_now){

885

1076

return;

886

1077

}

887

1078

quit_now = 1;

1079

signal_received = sig;

888

1080

int old_errno = errno;

1081

/* set main loop to exit */

889

1082

if(mc.simple_poll != NULL){

890

1083

avahi_simple_poll_quit(mc.simple_poll);

891

1084

}

892

1085

errno = old_errno;

893

1086

}

894

1087

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

int ret;

1096

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

1097

return 0;

1098

}

1099

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

1100

if(s < 0){

1101

perror_plus("socket");

1102

return 0;

1103

}

1104

struct ifreq ifr;

1105

strcpy(ifr.ifr_name, if_entry->d_name);

1106

ret = ioctl(s, SIOCGIFFLAGS, &ifr);

1107

if(ret == -1){

1108

if(debug){

1109

perror_plus("ioctl SIOCGIFFLAGS");

1110

}

1111

return 0;

1112

}

1113

/* Reject the loopback device */

1114

if(ifr.ifr_flags & IFF_LOOPBACK){

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 0;

1120

}

1121

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

1122

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

1123

if(debug){

1124

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

1125

if_entry->d_name);

1126

}

1127

return 1;

1128

}

1129

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

1130

if(not (ifr.ifr_flags & IFF_BROADCAST)){

1131

if(debug){

1132

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

1133

if_entry->d_name);

1134

}

1135

return 0;

1136

}

1137

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

1138

if(ifr.ifr_flags & IFF_NOARP){

1139

if(debug){

1140

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

1141

if_entry->d_name);

1142

}

1143

return 0;

1144

}

1145

/* Accept this device */

1146

if(debug){

1147

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1148

if_entry->d_name);

1149

}

1150

return 1;

1151

}

1152

1153

int notdotentries(const struct dirent *direntry){

1154

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

1155

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

1156

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

1157

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

1158

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

1159

return 0;

1160

}

1161

return 1;

1162

}

1163

1164

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1165

int ret;

1166

struct timespec now;

1167

struct timespec waited_time;

1168

intmax_t block_time;

1169

1170

while(true){

1171

if(mc.current_server == NULL){

1172

if (debug){

1173

fprintf(stderr,

1174

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

1175

}

1176

ret = avahi_simple_poll_iterate(s, -1);

1177

} else {

1178

if (debug){

1179

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

1180

" or wait\n");

1181

}

1182

/* the current time */

1183

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1184

if(ret == -1){

1185

perror_plus("clock_gettime");

1186

return -1;

1187

}

1188

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

1189

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

1190

waited_time.tv_sec = (now.tv_sec

1191

- mc.current_server->last_seen.tv_sec);

1192

waited_time.tv_nsec = (now.tv_nsec

1193

- mc.current_server->last_seen.tv_nsec);

1194

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

1195

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

1196

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

1197

block_time = ((retry_interval

1198

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

1199

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

1200

1201

if (debug){

1202

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

1203

}

1204

1205

if(block_time <= 0){

1206

ret = start_mandos_communication(mc.current_server->ip,

1207

mc.current_server->port,

1208

mc.current_server->if_index,

1209

mc.current_server->af);

1210

if(ret == 0){

1211

avahi_simple_poll_quit(mc.simple_poll);

1212

return 0;

1213

}

1214

ret = clock_gettime(CLOCK_MONOTONIC,

1215

&mc.current_server->last_seen);

1216

if(ret == -1){

1217

perror_plus("clock_gettime");

1218

return -1;

1219

}

1220

mc.current_server = mc.current_server->next;

1221

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

1222

servers, but don't block */

1223

}

1224

1225

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

1226

}

1227

if(ret != 0){

1228

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

1229

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

1230

}

1231

}

1232

}

1233

}

1234

895

1235

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

896

1236

AvahiSServiceBrowser *sb = NULL;

897

1237

int error;

899

1239

intmax_t tmpmax;

900

1240

char *tmp;

901

1241

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1242

const char *interface = "";

903

1243

struct ifreq network;

904

int sd;

1244

int sd = -1;

1245

bool take_down_interface = false;

905

1246

uid_t uid;

906

1247

gid_t gid;

907

char *connect_to = NULL;

908

1248

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

909

1249

bool tempdir_created = false;

910

1250

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

914

1254

bool gnutls_initialized = false;

915

1255

bool gpgme_initialized = false;

916

1256

float delay = 2.5f;

1257

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

1258

retrying the same server again */

917

1259

918

struct sigaction old_sigterm_action;

1260

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1261

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1262

1263

uid = getuid();

1264

gid = getgid();

1265

1266

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

1267

errno = 0;

1268

ret = setgid(gid);

1269

if(ret == -1){

1270

perror_plus("setgid");

1271

}

1272

1273

/* Lower user privileges (temporarily) */

1274

errno = 0;

1275

ret = seteuid(uid);

1276

if(ret == -1){

1277

perror_plus("seteuid");

1278

}

1279

1280

if(quit_now){

1281

goto end;

1282

}

1283

921

1284

{

922

1285

struct argp_option options[] = {

923

1286

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

952

1315

.arg = "SECONDS",

953

1316

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

954

1317

.group = 2 },

1318

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

1319

.arg = "SECONDS",

1320

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

1321

.group = 2 },

1322

/*

1323

* These reproduce what we would get without ARGP_NO_HELP

1324

*/

1325

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

1326

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

1327

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

1328

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

1329

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

1330

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

955

1331

{ .name = NULL }

956

1332

};

957

1333

958

1334

error_t parse_opt(int key, char *arg,

959

1335

struct argp_state *state){

1336

errno = 0;

960

1337

switch(key){

961

1338

case 128: /* --debug */

962

1339

debug = true;

978

1355

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

979

1356

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

980

1357

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

981

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

982

exit(EXIT_FAILURE);

1358

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

983

1359

}

984

1360

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

985

1361

break;

990

1366

errno = 0;

991

1367

delay = strtof(arg, &tmp);

992

1368

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

993

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

994

exit(EXIT_FAILURE);

1369

argp_error(state, "Bad delay");

1370

}

1371

case 132: /* --retry */

1372

errno = 0;

1373

retry_interval = strtod(arg, &tmp);

1374

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

1375

or (retry_interval * 1000) > INT_MAX

1376

or retry_interval < 0){

1377

argp_error(state, "Bad retry interval");

995

1378

}

996

1379

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1380

/*

1381

* These reproduce what we would get without ARGP_NO_HELP

1382

*/

1383

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

1384

argp_state_help(state, state->out_stream,

1385

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1386

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1387

case -3: /* --usage */

1388

argp_state_help(state, state->out_stream,

1389

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1390

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

1391

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

1392

exit(argp_err_exit_status);

1000

1393

break;

1001

1394

default:

1002

1395

return ARGP_ERR_UNKNOWN;

1003

1396

}

1004

return 0;

1397

return errno;

1005

1398

}

1006

1399

1007

1400

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

1008

1401

.args_doc = "",

1009

1402

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

1010

1403

" passwords from a Mandos server" };

1011

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

1012

if(ret == ARGP_ERR_UNKNOWN){

1013

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

1014

exitcode = EXIT_FAILURE;

1015

goto end;

1404

ret = argp_parse(&argp, argc, argv,

1405

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1406

switch(ret){

1407

case 0:

1408

break;

1409

case ENOMEM:

1410

default:

1411

errno = ret;

1412

perror_plus("argp_parse");

1413

exitcode = EX_OSERR;

1414

goto end;

1415

case EINVAL:

1416

exitcode = EX_USAGE;

1417

goto end;

1418

}

1419

}

1420

1421

{

1422

/* Work around Debian bug #633582:

1423

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

1424

struct stat st;

1425

1426

/* Re-raise priviliges */

1427

errno = 0;

1428

ret = seteuid(0);

1429

if(ret == -1){

1430

perror_plus("seteuid");

1431

}

1432

1433

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

1434

int seckey_fd = open(seckey, O_RDONLY);

1435

if(seckey_fd == -1){

1436

perror_plus("open");

1437

} else {

1438

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

1439

if(ret == -1){

1440

perror_plus("fstat");

1441

} else {

1442

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

1443

ret = fchown(seckey_fd, uid, gid);

1444

if(ret == -1){

1445

perror_plus("fchown");

1446

}

1447

}

1448

}

1449

TEMP_FAILURE_RETRY(close(seckey_fd));

1450

}

1451

}

1452

1453

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

1454

int pubkey_fd = open(pubkey, O_RDONLY);

1455

if(pubkey_fd == -1){

1456

perror_plus("open");

1457

} else {

1458

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

1459

if(ret == -1){

1460

perror_plus("fstat");

1461

} else {

1462

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

1463

ret = fchown(pubkey_fd, uid, gid);

1464

if(ret == -1){

1465

perror_plus("fchown");

1466

}

1467

}

1468

}

1469

TEMP_FAILURE_RETRY(close(pubkey_fd));

1470

}

1471

}

1472

1473

/* Lower privileges */

1474

errno = 0;

1475

ret = seteuid(uid);

1476

if(ret == -1){

1477

perror_plus("seteuid");

1016

1478

}

1017

1479

}

1018

1480

1019

1481

if(not debug){

1020

1482

avahi_set_log_function(empty_log);

1021

1483

}

1484

1485

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

1486

struct dirent **direntries;

1487

ret = scandir(sys_class_net, &direntries, good_interface,

1488

alphasort);

1489

if(ret >= 1){

1490

/* Pick the first good interface */

1491

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

1492

if(debug){

1493

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

1494

}

1495

if(interface == NULL){

1496

perror_plus("malloc");

1497

free(direntries);

1498

exitcode = EXIT_FAILURE;

1499

goto end;

1500

}

1501

free(direntries);

1502

} else {

1503

free(direntries);

1504

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

1505

exitcode = EXIT_FAILURE;

1506

goto end;

1507

}

1508

}

1022

1509

1023

1510

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

1024

1511

from the signal handler */

1027

1514

mc.simple_poll = avahi_simple_poll_new();

1028

1515

if(mc.simple_poll == NULL){

1029

1516

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

1030

exitcode = EXIT_FAILURE;

1517

exitcode = EX_UNAVAILABLE;

1031

1518

goto end;

1032

1519

}

1033

1520

1034

1521

sigemptyset(&sigterm_action.sa_mask);

1035

1522

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

1036

1523

if(ret == -1){

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1524

perror_plus("sigaddset");

1525

exitcode = EX_OSERR;

1039

1526

goto end;

1040

1527

}

1041

1528

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

1042

1529

if(ret == -1){

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1530

perror_plus("sigaddset");

1531

exitcode = EX_OSERR;

1045

1532

goto end;

1046

1533

}

1047

1534

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

1048

1535

if(ret == -1){

1049

perror("sigaddset");

1050

exitcode = EXIT_FAILURE;

1051

goto end;

1052

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

1536

perror_plus("sigaddset");

1537

exitcode = EX_OSERR;

1538

goto end;

1539

}

1540

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

1541

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

1542

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

1543

*/

1544

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

1545

if(ret == -1){

1546

perror_plus("sigaction");

1547

return EX_OSERR;

1548

}

1549

if(old_sigterm_action.sa_handler != SIG_IGN){

1550

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

1551

if(ret == -1){

1552

perror_plus("sigaction");

1553

exitcode = EX_OSERR;

1554

goto end;

1555

}

1556

}

1557

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

1558

if(ret == -1){

1559

perror_plus("sigaction");

1560

return EX_OSERR;

1561

}

1562

if(old_sigterm_action.sa_handler != SIG_IGN){

1563

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

1564

if(ret == -1){

1565

perror_plus("sigaction");

1566

exitcode = EX_OSERR;

1567

goto end;

1568

}

1569

}

1570

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

1571

if(ret == -1){

1572

perror_plus("sigaction");

1573

return EX_OSERR;

1574

}

1575

if(old_sigterm_action.sa_handler != SIG_IGN){

1576

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

1577

if(ret == -1){

1578

perror_plus("sigaction");

1579

exitcode = EX_OSERR;

1580

goto end;

1581

}

1582

}

1059

1583

1060

1584

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

1061

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

1585

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

1586

if_index = (AvahiIfIndex) if_nametoindex(interface);

1587

if(if_index == 0){

1588

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

1589

exitcode = EX_UNAVAILABLE;

1590

goto end;

1591

}

1592

1593

if(quit_now){

1594

goto end;

1595

}

1596

1597

/* Re-raise priviliges */

1598

errno = 0;

1599

ret = seteuid(0);

1600

if(ret == -1){

1601

perror_plus("seteuid");

1602

}

1603

1062

1604

#ifdef __linux__

1063

1605

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1606

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

1065

1607

ret = klogctl(8, NULL, 5);

1066

1608

bool restore_loglevel = true;

1067

1609

if(ret == -1){

1068

1610

restore_loglevel = false;

1069

perror("klogctl");

1611

perror_plus("klogctl");

1070

1612

}

1071

1613

#endif /* __linux__ */

1072

1614

1073

1615

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

1616

if(sd < 0){

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1617

perror_plus("socket");

1618

exitcode = EX_OSERR;

1077

1619

#ifdef __linux__

1078

1620

if(restore_loglevel){

1079

1621

ret = klogctl(7, NULL, 0);

1080

1622

if(ret == -1){

1081

perror("klogctl");

1623

perror_plus("klogctl");

1082

1624

}

1083

1625

}

1084

1626

#endif /* __linux__ */

1627

/* Lower privileges */

1628

errno = 0;

1629

ret = seteuid(uid);

1630

if(ret == -1){

1631

perror_plus("seteuid");

1632

}

1085

1633

goto end;

1086

1634

}

1087

1635

strcpy(network.ifr_name, interface);

1088

1636

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

1089

1637

if(ret == -1){

1090

perror("ioctl SIOCGIFFLAGS");

1638

perror_plus("ioctl SIOCGIFFLAGS");

1091

1639

#ifdef __linux__

1092

1640

if(restore_loglevel){

1093

1641

ret = klogctl(7, NULL, 0);

1094

1642

if(ret == -1){

1095

perror("klogctl");

1643

perror_plus("klogctl");

1096

1644

}

1097

1645

}

1098

1646

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1647

exitcode = EX_OSERR;

1648

/* Lower privileges */

1649

errno = 0;

1650

ret = seteuid(uid);

1651

if(ret == -1){

1652

perror_plus("seteuid");

1653

}

1100

1654

goto end;

1101

1655

}

1102

1656

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

1103

1657

network.ifr_flags |= IFF_UP;

1658

take_down_interface = true;

1104

1659

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

1105

1660

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1661

take_down_interface = false;

1662

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1663

exitcode = EX_OSERR;

1108

1664

#ifdef __linux__

1109

1665

if(restore_loglevel){

1110

1666

ret = klogctl(7, NULL, 0);

1111

1667

if(ret == -1){

1112

perror("klogctl");

1668

perror_plus("klogctl");

1113

1669

}

1114

1670

}

1115

1671

#endif /* __linux__ */

1672

/* Lower privileges */

1673

errno = 0;

1674

ret = seteuid(uid);

1675

if(ret == -1){

1676

perror_plus("seteuid");

1677

}

1116

1678

goto end;

1117

1679

}

1118

1680

}

1119

/* sleep checking until interface is running */

1681

/* Sleep checking until interface is running.

1682

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

1120

1683

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

1121

1684

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

1122

1685

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1686

perror_plus("ioctl SIOCGIFFLAGS");

1124

1687

} else if(network.ifr_flags & IFF_RUNNING){

1125

1688

break;

1126

1689

}

1127

1690

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1691

ret = nanosleep(&sleeptime, NULL);

1129

1692

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

1130

perror("nanosleep");

1693

perror_plus("nanosleep");

1131

1694

}

1132

1695

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1696

if(not take_down_interface){

1697

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

1698

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

1699

if(ret == -1){

1700

perror_plus("close");

1701

}

1136

1702

}

1137

1703

#ifdef __linux__

1138

1704

if(restore_loglevel){

1139

1705

/* Restores kernel loglevel to default */

1140

1706

ret = klogctl(7, NULL, 0);

1141

1707

if(ret == -1){

1142

perror("klogctl");

1708

perror_plus("klogctl");

1143

1709

}

1144

1710

}

1145

1711

#endif /* __linux__ */

1146

}

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

errno = 0;

1152

setgid(gid);

1153

if(ret == -1){

1154

perror("setgid");

1155

}

1156

1157

ret = setuid(uid);

1158

if(ret == -1){

1159

perror("setuid");

1712

/* Lower privileges */

1713

errno = 0;

1714

if(take_down_interface){

1715

/* Lower privileges */

1716

ret = seteuid(uid);

1717

if(ret == -1){

1718

perror_plus("seteuid");

1719

}

1720

} else {

1721

/* Lower privileges permanently */

1722

ret = setuid(uid);

1723

if(ret == -1){

1724

perror_plus("setuid");

1725

}

1726

}

1727

}

1728

1729

if(quit_now){

1730

goto end;

1160

1731

}

1161

1732

1162

1733

ret = init_gnutls_global(pubkey, seckey);

1163

1734

if(ret == -1){

1164

1735

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

1165

exitcode = EXIT_FAILURE;

1736

exitcode = EX_UNAVAILABLE;

1166

1737

goto end;

1167

1738

} else {

1168

1739

gnutls_initialized = true;

1169

1740

}

1170

1741

1742

if(quit_now){

1743

goto end;

1744

}

1745

1171

1746

if(mkdtemp(tempdir) == NULL){

1172

perror("mkdtemp");

1747

perror_plus("mkdtemp");

1173

1748

goto end;

1174

1749

}

1175

1750

tempdir_created = true;

1176

1751

1752

if(quit_now){

1753

goto end;

1754

}

1755

1177

1756

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

1178

1757

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

1179

exitcode = EXIT_FAILURE;

1758

exitcode = EX_UNAVAILABLE;

1180

1759

goto end;

1181

1760

} else {

1182

1761

gpgme_initialized = true;

1183

1762

}

1184

1763

1185

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

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

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

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

1764

if(quit_now){

1765

goto end;

1192

1766

}

1193

1767

1194

1768

if(connect_to != NULL){

1197

1771

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

1198

1772

if(address == NULL){

1199

1773

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1774

exitcode = EX_USAGE;

1775

goto end;

1776

}

1777

1778

if(quit_now){

1779

goto end;

1780

}

1781

1203

1782

uint16_t port;

1204

1783

errno = 0;

1205

1784

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

1206

1785

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

1207

1786

or tmpmax != (uint16_t)tmpmax){

1208

1787

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1788

exitcode = EX_USAGE;

1789

goto end;

1790

}

1791

1792

if(quit_now){

1793

goto end;

1794

}

1795

1212

1796

port = (uint16_t)tmpmax;

1213

1797

*address = '\0';

1214

address = connect_to;

1215

1798

/* Colon in address indicates IPv6 */

1216

1799

int af;

1217

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

1800

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

1218

1801

af = AF_INET6;

1802

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

1803

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

1804

{

1805

connect_to++;

1806

address[-1] = '\0';

1807

}

1219

1808

} else {

1220

1809

af = AF_INET;

1221

1810

}

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

1811

address = connect_to;

1812

1813

if(quit_now){

1814

goto end;

1815

}

1816

1817

while(not quit_now){

1818

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

1819

if(quit_now or ret == 0){

1820

break;

1821

}

1822

if(debug){

1823

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

1824

(int)retry_interval);

1825

}

1826

sleep((int)retry_interval);

1827

}

1828

1829

if (not quit_now){

1226

1830

exitcode = EXIT_SUCCESS;

1227

1831

}

1228

goto end;

1229

}

1230

1832

1833

goto end;

1834

}

1835

1836

if(quit_now){

1837

goto end;

1838

}

1839

1231

1840

{

1232

1841

AvahiServerConfig config;

1233

1842

/* Do not publish any local Zeroconf records */

1250

1859

if(mc.server == NULL){

1251

1860

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

1252

1861

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

1862

exitcode = EX_UNAVAILABLE;

1863

goto end;

1864

}

1865

1866

if(quit_now){

1254

1867

goto end;

1255

1868

}

1256

1869

1261

1874

if(sb == NULL){

1262

1875

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

1263

1876

avahi_strerror(avahi_server_errno(mc.server)));

1264

exitcode = EXIT_FAILURE;

1877

exitcode = EX_UNAVAILABLE;

1878

goto end;

1879

}

1880

1881

if(quit_now){

1265

1882

goto end;

1266

1883

}

1267

1884

1270

1887

if(debug){

1271

1888

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

1272

1889

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

1890

1891

ret = avahi_loop_with_timeout(mc.simple_poll,

1892

(int)(retry_interval * 1000));

1893

if(debug){

1894

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

1895

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

1896

}

1275

1897

1276

1898

end:

1277

1899

1298

1920

if(gpgme_initialized){

1299

1921

gpgme_release(mc.ctx);

1300

1922

}

1301

1302

/* Removes the temp directory used by GPGME */

1923

1924

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

1925

has seen */

1926

if(mc.current_server != NULL){

1927

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

1928

while(mc.current_server != NULL){

1929

server *next = mc.current_server->next;

1930

free(mc.current_server);

1931

mc.current_server = next;

1932

}

1933

}

1934

1935

/* Take down the network interface */

1936

if(take_down_interface){

1937

/* Re-raise priviliges */

1938

errno = 0;

1939

ret = seteuid(0);

1940

if(ret == -1){

1941

perror_plus("seteuid");

1942

}

1943

if(geteuid() == 0){

1944

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

1945

if(ret == -1){

1946

perror_plus("ioctl SIOCGIFFLAGS");

1947

} else if(network.ifr_flags & IFF_UP) {

1948

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

1949

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

1950

if(ret == -1){

1951

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1952

}

1953

}

1954

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

1955

if(ret == -1){

1956

perror_plus("close");

1957

}

1958

/* Lower privileges permanently */

1959

errno = 0;

1960

ret = setuid(uid);

1961

if(ret == -1){

1962

perror_plus("setuid");

1963

}

1964

}

1965

}

1966

1967

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

1303

1968

if(tempdir_created){

1304

DIR *d;

1305

struct dirent *direntry;

1306

d = opendir(tempdir);

1307

if(d == NULL){

1308

if(errno != ENOENT){

1309

perror("opendir");

1310

}

1311

} else {

1312

while(true){

1313

direntry = readdir(d);

1314

if(direntry == NULL){

1315

break;

1316

}

1317

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

1318

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

1319

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

1320

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

1321

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

1322

continue;

1323

}

1969

struct dirent **direntries = NULL;

1970

struct dirent *direntry = NULL;

1971

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

1972

alphasort);

1973

if (numentries > 0){

1974

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

1975

direntry = direntries[i];

1324

1976

char *fullname = NULL;

1325

1977

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

1326

1978

direntry->d_name);

1327

1979

if(ret < 0){

1328

perror("asprintf");

1980

perror_plus("asprintf");

1329

1981

continue;

1330

1982

}

1331

1983

ret = remove(fullname);

1335

1987

}

1336

1988

free(fullname);

1337

1989

}

1338

closedir(d);

1990

}

1991

1992

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

1993

free(direntries);

1994

if (numentries == -1){

1995

perror_plus("scandir");

1339

1996

}

1340

1997

ret = rmdir(tempdir);

1341

1998

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

1342

perror("rmdir");

1343

}

1999

perror_plus("rmdir");

2000

}

2001

}

2002

2003

if(quit_now){

2004

sigemptyset(&old_sigterm_action.sa_mask);

2005

old_sigterm_action.sa_handler = SIG_DFL;

2006

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2007

&old_sigterm_action,

2008

NULL));

2009

if(ret == -1){

2010

perror_plus("sigaction");

2011

}

2012

do {

2013

ret = raise(signal_received);

2014

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

2015

if(ret != 0){

2016

perror_plus("raise");

2017

abort();

2018

}

2019

TEMP_FAILURE_RETRY(pause());

1344

2020

}

1345

2021

1346

2022

return exitcode;