/mandos/release : revision 237.16.2

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() */

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() */

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

56

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

57

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

58

inet_pton(), connect() */

59

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

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() */

120

123

#define PATHDIR "/conf/conf.d/mandos"

121

124

#define SECKEY "seckey.txt"

122

125

#define PUBKEY "pubkey.txt"

126

#define HOOKDIR "/lib/mandos/network-hooks.d"

123

127

124

128

bool debug = false;

125

129

static const char mandos_protocol_version[] = "1";

126

130

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

127

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

131

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

132

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

133

char *connect_to = NULL;

134

135

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

136

typedef struct server{

137

const char *ip;

138

uint16_t port;

139

AvahiIfIndex if_index;

140

int af;

141

struct timespec last_seen;

142

struct server *next;

143

struct server *prev;

144

} server;

128

145

129

146

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

130

147

typedef struct {

135

152

gnutls_dh_params_t dh_params;

136

153

const char *priority;

137

154

gpgme_ctx_t ctx;

155

server *current_server;

138

156

} mandos_context;

139

157

140

158

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

141

159

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

142

160

.dh_bits = 1024, .priority = "SECURE256"

143

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

161

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

162

.current_server = NULL };

163

164

sig_atomic_t quit_now = 0;

165

int signal_received = 0;

166

167

/* Function to use when printing errors */

168

void perror_plus(const char *print_text){

169

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

170

program_invocation_short_name);

171

perror(print_text);

172

}

144

173

145

174

/*

146

175

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

159

188

return buffer_capacity;

160

189

}

161

190

191

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

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

195

int ret;

196

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

197

if(new_server == NULL){

198

perror_plus("malloc");

199

return -1;

200

}

201

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

202

.port = port,

203

.if_index = if_index,

204

.af = af };

205

if(new_server->ip == NULL){

206

perror_plus("strdup");

207

return -1;

208

}

209

/* Special case of first server */

210

if (mc.current_server == NULL){

211

new_server->next = new_server;

212

new_server->prev = new_server;

213

mc.current_server = new_server;

214

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

215

} else {

216

new_server->next = mc.current_server;

217

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

218

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

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

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

227

}

228

162

229

/*

163

230

* Initialize GPGME.

164

231

*/

165

232

static bool init_gpgme(const char *seckey,

166

233

const char *pubkey, const char *tempdir){

167

int ret;

168

234

gpgme_error_t rc;

169

235

gpgme_engine_info_t engine_info;

170

236

173

239

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

174

240

*/

175

241

bool import_key(const char *filename){

242

int ret;

176

243

int fd;

177

244

gpgme_data_t pgp_data;

178

245

179

246

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

180

247

if(fd == -1){

181

perror("open");

248

perror_plus("open");

182

249

return false;

183

250

}

184

251

198

265

199

266

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

200

267

if(ret == -1){

201

perror("close");

268

perror_plus("close");

202

269

}

203

270

gpgme_data_release(pgp_data);

204

271

return true;

217

284

return false;

218

285

}

219

286

220

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

287

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

221

288

rc = gpgme_get_engine_info(&engine_info);

222

289

if(rc != GPG_ERR_NO_ERROR){

223

290

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

249

316

return false;

250

317

}

251

318

252

return true;

319

return true;

253

320

}

254

321

255

322

/*

309

376

}

310

377

gpgme_recipient_t recipient;

311

378

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

}

379

while(recipient != NULL){

380

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

381

gpgme_pubkey_algo_name(recipient->pubkey_algo));

382

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

383

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

384

recipient->status == GPG_ERR_NO_SECKEY

385

? "No" : "Yes");

386

recipient = recipient->next;

322

387

}

323

388

}

324

389

}

331

396

332

397

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

333

398

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

334

perror("gpgme_data_seek");

399

perror_plus("gpgme_data_seek");

335

400

plaintext_length = -1;

336

401

goto decrypt_end;

337

402

}

342

407

(size_t)plaintext_length,

343

408

plaintext_capacity);

344

409

if(plaintext_capacity == 0){

345

perror("incbuffer");

410

perror_plus("incbuffer");

346

411

plaintext_length = -1;

347

412

goto decrypt_end;

348

413

}

355

420

break;

356

421

}

357

422

if(ret < 0){

358

perror("gpgme_data_read");

423

perror_plus("gpgme_data_read");

359

424

plaintext_length = -1;

360

425

goto decrypt_end;

361

426

}

418

483

}

419

484

420

485

/* OpenPGP credentials */

421

gnutls_certificate_allocate_credentials(&mc.cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

422

487

if(ret != GNUTLS_E_SUCCESS){

423

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

424

from

425

-Wunreachable-code

426

*/

488

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

427

489

safer_gnutls_strerror(ret));

428

490

gnutls_global_deinit();

429

491

return -1;

476

538

static int init_gnutls_session(gnutls_session_t *session){

477

539

int ret;

478

540

/* GnuTLS session creation */

479

ret = gnutls_init(session, GNUTLS_SERVER);

541

do {

542

ret = gnutls_init(session, GNUTLS_SERVER);

543

if(quit_now){

544

return -1;

545

}

546

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

480

547

if(ret != GNUTLS_E_SUCCESS){

481

548

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

482

549

safer_gnutls_strerror(ret));

484

551

485

552

{

486

553

const char *err;

487

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

554

do {

555

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

556

if(quit_now){

557

gnutls_deinit(*session);

558

return -1;

559

}

560

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

488

561

if(ret != GNUTLS_E_SUCCESS){

489

562

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

490

563

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

494

567

}

495

568

}

496

569

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

570

do {

571

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

572

mc.cred);

573

if(quit_now){

574

gnutls_deinit(*session);

575

return -1;

576

}

577

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

499

578

if(ret != GNUTLS_E_SUCCESS){

500

579

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

501

580

safer_gnutls_strerror(ret));

504

583

}

505

584

506

585

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

586

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

587

510

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

589

520

598

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

521

599

AvahiIfIndex if_index,

522

600

int af){

523

int ret, tcp_sd;

601

int ret, tcp_sd = -1;

524

602

ssize_t sret;

525

603

union {

526

604

struct sockaddr_in in;

527

605

struct sockaddr_in6 in6;

528

606

} to;

529

607

char *buffer = NULL;

530

char *decrypted_buffer;

608

char *decrypted_buffer = NULL;

531

609

size_t buffer_length = 0;

532

610

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

611

size_t written;

535

int retval = 0;

612

int retval = -1;

536

613

gnutls_session_t session;

537

614

int pf; /* Protocol family */

538

615

616

errno = 0;

617

618

if(quit_now){

619

errno = EINTR;

620

return -1;

621

}

622

539

623

switch(af){

540

624

case AF_INET6:

541

625

pf = PF_INET6;

545

629

break;

546

630

default:

547

631

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

632

errno = EINVAL;

548

633

return -1;

549

634

}

550

635

560

645

561

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

647

if(tcp_sd < 0){

563

perror("socket");

564

return -1;

648

int e = errno;

649

perror_plus("socket");

650

errno = e;

651

goto mandos_end;

652

}

653

654

if(quit_now){

655

errno = EINTR;

656

goto mandos_end;

565

657

}

566

658

567

659

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

568

660

if(af == AF_INET6){

569

to.in6.sin6_family = (uint16_t)af;

661

to.in6.sin6_family = (sa_family_t)af;

570

662

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

571

663

} else { /* IPv4 */

572

664

to.in.sin_family = (sa_family_t)af;

573

665

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

574

666

}

575

667

if(ret < 0 ){

576

perror("inet_pton");

577

return -1;

668

int e = errno;

669

perror_plus("inet_pton");

670

errno = e;

671

goto mandos_end;

578

672

}

579

673

if(ret == 0){

674

int e = errno;

580

675

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

581

return -1;

676

errno = e;

677

goto mandos_end;

582

678

}

583

679

if(af == AF_INET6){

584

680

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

591

687

if(if_index == AVAHI_IF_UNSPEC){

592

688

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

593

689

" without a network interface\n");

594

return -1;

690

errno = EINVAL;

691

goto mandos_end;

595

692

}

596

693

/* Set the network interface number as scope */

597

694

to.in6.sin6_scope_id = (uint32_t)if_index;

602

699

-Wunreachable-code */

603

700

}

604

701

702

if(quit_now){

703

errno = EINTR;

704

goto mandos_end;

705

}

706

605

707

if(debug){

606

708

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

607

709

char interface[IF_NAMESIZE];

608

710

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

609

perror("if_indextoname");

711

perror_plus("if_indextoname");

610

712

} else {

611

713

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

612

714

ip, interface, port);

626

728

sizeof(addrstr));

627

729

}

628

730

if(pcret == NULL){

629

perror("inet_ntop");

731

perror_plus("inet_ntop");

630

732

} else {

631

733

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

632

734

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

634

736

}

635

737

}

636

738

739

if(quit_now){

740

errno = EINTR;

741

goto mandos_end;

742

}

743

637

744

if(af == AF_INET6){

638

745

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

639

746

} else {

640

747

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

641

748

}

642

749

if(ret < 0){

643

perror("connect");

644

return -1;

750

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

751

int e = errno;

752

perror_plus("connect");

753

errno = e;

754

}

755

goto mandos_end;

756

}

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

645

761

}

646

762

647

763

const char *out = mandos_protocol_version;

651

767

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

652

768

out_size - written));

653

769

if(ret == -1){

654

perror("write");

655

retval = -1;

770

int e = errno;

771

perror_plus("write");

772

errno = e;

656

773

goto mandos_end;

657

774

}

658

775

written += (size_t)ret;

666

783

break;

667

784

}

668

785

}

786

787

if(quit_now){

788

errno = EINTR;

789

goto mandos_end;

790

}

669

791

}

670

792

671

793

if(debug){

672

794

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

673

795

}

674

796

797

if(quit_now){

798

errno = EINTR;

799

goto mandos_end;

800

}

801

802

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

675

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

804

677

do{

805

if(quit_now){

806

errno = EINTR;

807

goto mandos_end;

808

}

809

810

do {

678

811

ret = gnutls_handshake(session);

812

if(quit_now){

813

errno = EINTR;

814

goto mandos_end;

815

}

679

816

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

680

817

681

818

if(ret != GNUTLS_E_SUCCESS){

683

820

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

684

821

gnutls_perror(ret);

685

822

}

686

retval = -1;

823

errno = EPROTO;

687

824

goto mandos_end;

688

825

}

689

826

695

832

}

696

833

697

834

while(true){

835

836

if(quit_now){

837

errno = EINTR;

838

goto mandos_end;

839

}

840

698

841

buffer_capacity = incbuffer(&buffer, buffer_length,

699

842

buffer_capacity);

700

843

if(buffer_capacity == 0){

701

perror("incbuffer");

702

retval = -1;

844

int e = errno;

845

perror_plus("incbuffer");

846

errno = e;

847

goto mandos_end;

848

}

849

850

if(quit_now){

851

errno = EINTR;

703

852

goto mandos_end;

704

853

}

705

854

714

863

case GNUTLS_E_AGAIN:

715

864

break;

716

865

case GNUTLS_E_REHANDSHAKE:

717

do{

866

do {

718

867

ret = gnutls_handshake(session);

868

869

if(quit_now){

870

errno = EINTR;

871

goto mandos_end;

872

}

719

873

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

720

874

if(ret < 0){

721

875

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

722

876

gnutls_perror(ret);

723

retval = -1;

877

errno = EPROTO;

724

878

goto mandos_end;

725

879

}

726

880

break;

727

881

default:

728

882

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

729

883

" encrypted session with Mandos server\n");

730

retval = -1;

731

884

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

errno = EIO;

732

886

goto mandos_end;

733

887

}

734

888

} else {

740

894

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

741

895

}

742

896

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

897

if(quit_now){

898

errno = EINTR;

899

goto mandos_end;

900

}

901

902

do {

903

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

if(quit_now){

905

errno = EINTR;

906

goto mandos_end;

907

}

908

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

744

909

745

910

if(buffer_length > 0){

911

ssize_t decrypted_buffer_size;

746

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

913

buffer_length,

748

914

&decrypted_buffer);

749

915

if(decrypted_buffer_size >= 0){

916

750

917

written = 0;

751

918

while(written < (size_t) decrypted_buffer_size){

919

if(quit_now){

920

errno = EINTR;

921

goto mandos_end;

922

}

923

752

924

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

753

925

(size_t)decrypted_buffer_size - written,

754

926

stdout);

755

927

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

928

int e = errno;

756

929

if(debug){

757

930

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

758

931

strerror(errno));

759

932

}

760

retval = -1;

761

break;

933

errno = e;

934

goto mandos_end;

762

935

}

763

936

written += (size_t)ret;

764

937

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

938

retval = 0;

768

939

}

769

} else {

770

retval = -1;

771

940

}

772

941

773

942

/* Shutdown procedure */

774

943

775

944

mandos_end:

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

945

{

946

int e = errno;

947

free(decrypted_buffer);

948

free(buffer);

949

if(tcp_sd >= 0){

950

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

951

}

952

if(ret == -1){

953

if(e == 0){

954

e = errno;

955

}

956

perror_plus("close");

957

}

958

gnutls_deinit(session);

959

errno = e;

960

if(quit_now){

961

errno = EINTR;

962

retval = -1;

963

}

780

964

}

781

gnutls_deinit(session);

782

965

return retval;

783

966

}

784

967

801

984

/* Called whenever a service has been resolved successfully or

802

985

timed out */

803

986

987

if(quit_now){

988

return;

989

}

990

804

991

switch(event){

805

992

default:

806

993

case AVAHI_RESOLVER_FAILURE:

822

1009

avahi_proto_to_af(proto));

823

1010

if(ret == 0){

824

1011

avahi_simple_poll_quit(mc.simple_poll);

1012

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

825

1015

}

826

1016

}

827

1017

}

843

1033

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

844

1034

is removed from the LAN */

845

1035

1036

if(quit_now){

1037

return;

1038

}

1039

846

1040

switch(event){

847

1041

default:

848

1042

case AVAHI_BROWSER_FAILURE:

877

1071

}

878

1072

}

879

1073

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){

1074

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

1075

static void handle_sigterm(int sig){

884

1076

if(quit_now){

885

1077

return;

886

1078

}

887

1079

quit_now = 1;

1080

signal_received = sig;

888

1081

int old_errno = errno;

1082

/* set main loop to exit */

889

1083

if(mc.simple_poll != NULL){

890

1084

avahi_simple_poll_quit(mc.simple_poll);

891

1085

}

892

1086

errno = old_errno;

893

1087

}

894

1088

1089

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

1090

int ret;

1091

1092

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

1093

if(s < 0){

1094

perror_plus("socket");

1095

return false;

1096

}

1097

strcpy(ifr->ifr_name, ifname);

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

if(ret == -1){

1100

if(debug){

1101

perror_plus("ioctl SIOCGIFFLAGS");

1102

}

1103

return false;

1104

}

1105

return true;

1106

}

1107

1108

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

1109

1110

/* Reject the loopback device */

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

if(debug){

1113

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

1114

ifname);

1115

}

1116

return false;

1117

}

1118

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

1119

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

1120

if(debug){

1121

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

1122

ifname);

1123

}

1124

return true;

1125

}

1126

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

1127

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

1128

if(debug){

1129

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

1130

ifname);

1131

}

1132

return false;

1133

}

1134

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

1135

if(ifr->ifr_flags & IFF_NOARP){

1136

if(debug){

1137

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

1138

}

1139

return false;

1140

}

1141

1142

/* Accept this device */

1143

if(debug){

1144

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

1145

}

1146

return true;

1147

}

1148

1149

/*

1150

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

1151

* corresponds to an acceptable network device.

1152

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

1153

*/

1154

int good_interface(const struct dirent *if_entry){

1155

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

1156

return 0;

1157

}

1158

1159

struct ifreq ifr;

1160

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

1161

if(debug){

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

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

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

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

1186

if(debug){

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

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

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

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

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

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

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

1217

int notdotentries(const struct dirent *direntry){

1218

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

1219

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

1220

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

1221

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

1222

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

1223

return 0;

1224

}

1225

return 1;

1226

}

1227

1228

/* Is this directory entry a runnable program? */

1229

int runnable_hook(const struct dirent *direntry){

1230

int ret;

1231

struct stat st;

1232

1233

if((direntry->d_name)[0] == '\0'){

1234

/* Empty name? */

1235

return 0;

1236

}

1237

1238

/* Save pointer to last character */

1239

char *end = strchr(direntry->d_name, '\0')-1;

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

if(((direntry->d_name)[0] == '#')

1247

and (*end == '#')){

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

1255

if(ret == -1){

1256

if(debug){

1257

perror_plus("Could not stat plugin");

1258

}

1259

return 0;

1260

}

1261

if(not (S_ISREG(st.st_mode))){

1262

/* Not a regular file */

1263

return 0;

1264

}

1265

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1266

/* Not executable */

1267

return 0;

1268

}

1269

return 1;

1270

}

1271

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1273

int ret;

1274

struct timespec now;

1275

struct timespec waited_time;

1276

intmax_t block_time;

1277

1278

while(true){

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

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

1283

}

1284

ret = avahi_simple_poll_iterate(s, -1);

1285

} else {

1286

if (debug){

1287

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

1288

" or wait\n");

1289

}

1290

/* the current time */

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1292

if(ret == -1){

1293

perror_plus("clock_gettime");

1294

return -1;

1295

}

1296

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

1297

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

1298

waited_time.tv_sec = (now.tv_sec

1299

- mc.current_server->last_seen.tv_sec);

1300

waited_time.tv_nsec = (now.tv_nsec

1301

- mc.current_server->last_seen.tv_nsec);

1302

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

1303

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

1304

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

1305

block_time = ((retry_interval

1306

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

1307

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

1308

1309

if (debug){

1310

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

1311

}

1312

1313

if(block_time <= 0){

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1318

if(ret == 0){

1319

avahi_simple_poll_quit(mc.simple_poll);

1320

return 0;

1321

}

1322

ret = clock_gettime(CLOCK_MONOTONIC,

1323

&mc.current_server->last_seen);

1324

if(ret == -1){

1325

perror_plus("clock_gettime");

1326

return -1;

1327

}

1328

mc.current_server = mc.current_server->next;

1329

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

1330

servers, but don't block */

1331

}

1332

1333

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

1334

}

1335

if(ret != 0){

1336

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

1337

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

1338

}

1339

}

1340

}

1341

}

1342

895

1343

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

896

1344

AvahiSServiceBrowser *sb = NULL;

897

1345

int error;

899

1347

intmax_t tmpmax;

900

1348

char *tmp;

901

1349

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1350

const char *interface = "";

903

1351

struct ifreq network;

904

int sd;

1352

int sd = -1;

1353

bool take_down_interface = false;

905

1354

uid_t uid;

906

1355

gid_t gid;

907

char *connect_to = NULL;

908

1356

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

909

1357

bool tempdir_created = false;

910

1358

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

914

1362

bool gnutls_initialized = false;

915

1363

bool gpgme_initialized = false;

916

1364

float delay = 2.5f;

1365

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

1366

retrying the same server again */

917

1367

918

struct sigaction old_sigterm_action;

1368

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1369

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1370

1371

uid = getuid();

1372

gid = getgid();

1373

1374

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

1375

errno = 0;

1376

ret = setgid(gid);

1377

if(ret == -1){

1378

perror_plus("setgid");

1379

}

1380

1381

/* Lower user privileges (temporarily) */

1382

errno = 0;

1383

ret = seteuid(uid);

1384

if(ret == -1){

1385

perror_plus("seteuid");

1386

}

1387

1388

if(quit_now){

1389

goto end;

1390

}

1391

921

1392

{

922

1393

struct argp_option options[] = {

923

1394

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

952

1423

.arg = "SECONDS",

953

1424

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

954

1425

.group = 2 },

1426

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

1427

.arg = "SECONDS",

1428

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

1429

.group = 2 },

1430

/*

1431

* These reproduce what we would get without ARGP_NO_HELP

1432

*/

1433

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

1434

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

1435

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

1436

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

1437

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

1438

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

955

1439

{ .name = NULL }

956

1440

};

957

1441

958

1442

error_t parse_opt(int key, char *arg,

959

1443

struct argp_state *state){

1444

errno = 0;

960

1445

switch(key){

961

1446

case 128: /* --debug */

962

1447

debug = true;

978

1463

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

979

1464

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

980

1465

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

981

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

982

exit(EXIT_FAILURE);

1466

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

983

1467

}

984

1468

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

985

1469

break;

990

1474

errno = 0;

991

1475

delay = strtof(arg, &tmp);

992

1476

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

993

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

994

exit(EXIT_FAILURE);

1477

argp_error(state, "Bad delay");

1478

}

1479

case 132: /* --retry */

1480

errno = 0;

1481

retry_interval = strtod(arg, &tmp);

1482

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

1483

or (retry_interval * 1000) > INT_MAX

1484

or retry_interval < 0){

1485

argp_error(state, "Bad retry interval");

995

1486

}

996

1487

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1488

/*

1489

* These reproduce what we would get without ARGP_NO_HELP

1490

*/

1491

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

1492

argp_state_help(state, state->out_stream,

1493

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1494

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1495

case -3: /* --usage */

1496

argp_state_help(state, state->out_stream,

1497

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

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

1499

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

1500

exit(argp_err_exit_status);

1000

1501

break;

1001

1502

default:

1002

1503

return ARGP_ERR_UNKNOWN;

1003

1504

}

1004

return 0;

1505

return errno;

1005

1506

}

1006

1507

1007

1508

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

1008

1509

.args_doc = "",

1009

1510

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

1010

1511

" 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;

1016

}

1512

ret = argp_parse(&argp, argc, argv,

1513

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1514

switch(ret){

1515

case 0:

1516

break;

1517

case ENOMEM:

1518

default:

1519

errno = ret;

1520

perror_plus("argp_parse");

1521

exitcode = EX_OSERR;

1522

goto end;

1523

case EINVAL:

1524

exitcode = EX_USAGE;

1525

goto end;

1526

}

1527

}

1528

1529

{

1530

/* Work around Debian bug #633582:

1531

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

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

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

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

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

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

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

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

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

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

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

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

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

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,

1594

alphasort);

1595

int devnull = open("/dev/null", O_RDONLY);

1596

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

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

ret = setenv("DEVICE", interface, 1);

1612

if(ret == -1){

1613

perror_plus("setenv");

1614

exit(1);

1615

}

1616

ret = setenv("VERBOSE", debug ? "1" : "0", 1);

1617

if(ret == -1){

1618

perror_plus("setenv");

1619

exit(1);

1620

}

1621

ret = setenv("MODE", "start", 1);

1622

if(ret == -1){

1623

perror_plus("setenv");

1624

exit(1);

1625

}

1626

char *delaystring;

1627

ret = asprintf(&delaystring, "%f", delay);

1628

if(ret == -1){

1629

perror_plus("asprintf");

1630

exit(1);

1631

}

1632

ret = setenv("DELAY", delaystring, 1);

1633

if(ret == -1){

1634

free(delaystring);

1635

perror_plus("setenv");

1636

exit(1);

1637

}

1638

free(delaystring);

1639

ret = execl(fullname, direntry->d_name, "start", NULL);

1640

perror_plus("execl");

1641

}

1642

free(fullname);

1643

if(quit_now){

1644

goto end;

1645

}

1646

}

1647

close(devnull);

1017

1648

}

1018

1649

1019

1650

if(not debug){

1020

1651

avahi_set_log_function(empty_log);

1021

1652

}

1022

1653

1654

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

1655

struct dirent **direntries;

1656

/* First look for interfaces that are up */

1657

ret = scandir(sys_class_net, &direntries, up_interface,

1658

alphasort);

1659

if(ret == 0){

1660

/* No up interfaces, look for any good interfaces */

1661

free(direntries);

1662

ret = scandir(sys_class_net, &direntries, good_interface,

1663

alphasort);

1664

}

1665

if(ret >= 1){

1666

/* Pick the first interface returned */

1667

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

1668

if(debug){

1669

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

1670

}

1671

if(interface == NULL){

1672

perror_plus("malloc");

1673

free(direntries);

1674

exitcode = EXIT_FAILURE;

1675

goto end;

1676

}

1677

free(direntries);

1678

} else {

1679

free(direntries);

1680

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

1681

exitcode = EXIT_FAILURE;

1682

goto end;

1683

}

1684

}

1685

1023

1686

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

1024

1687

from the signal handler */

1025

1688

/* Initialize the pseudo-RNG for Avahi */

1027

1690

mc.simple_poll = avahi_simple_poll_new();

1028

1691

if(mc.simple_poll == NULL){

1029

1692

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

1030

exitcode = EXIT_FAILURE;

1693

exitcode = EX_UNAVAILABLE;

1031

1694

goto end;

1032

1695

}

1033

1696

1034

1697

sigemptyset(&sigterm_action.sa_mask);

1035

1698

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

1036

1699

if(ret == -1){

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1700

perror_plus("sigaddset");

1701

exitcode = EX_OSERR;

1039

1702

goto end;

1040

1703

}

1041

1704

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

1042

1705

if(ret == -1){

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1706

perror_plus("sigaddset");

1707

exitcode = EX_OSERR;

1045

1708

goto end;

1046

1709

}

1047

1710

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

1048

1711

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

}

1712

perror_plus("sigaddset");

1713

exitcode = EX_OSERR;

1714

goto end;

1715

}

1716

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

1717

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

1718

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

1719

*/

1720

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

1721

if(ret == -1){

1722

perror_plus("sigaction");

1723

return EX_OSERR;

1724

}

1725

if(old_sigterm_action.sa_handler != SIG_IGN){

1726

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

1727

if(ret == -1){

1728

perror_plus("sigaction");

1729

exitcode = EX_OSERR;

1730

goto end;

1731

}

1732

}

1733

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

1734

if(ret == -1){

1735

perror_plus("sigaction");

1736

return EX_OSERR;

1737

}

1738

if(old_sigterm_action.sa_handler != SIG_IGN){

1739

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

1740

if(ret == -1){

1741

perror_plus("sigaction");

1742

exitcode = EX_OSERR;

1743

goto end;

1744

}

1745

}

1746

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

1747

if(ret == -1){

1748

perror_plus("sigaction");

1749

return EX_OSERR;

1750

}

1751

if(old_sigterm_action.sa_handler != SIG_IGN){

1752

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

1753

if(ret == -1){

1754

perror_plus("sigaction");

1755

exitcode = EX_OSERR;

1756

goto end;

1757

}

1758

}

1059

1759

1060

1760

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

1061

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

1761

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

1762

if_index = (AvahiIfIndex) if_nametoindex(interface);

1763

if(if_index == 0){

1764

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

1765

exitcode = EX_UNAVAILABLE;

1766

goto end;

1767

}

1768

1769

if(quit_now){

1770

goto end;

1771

}

1772

1773

/* Re-raise priviliges */

1774

errno = 0;

1775

ret = seteuid(0);

1776

if(ret == -1){

1777

perror_plus("seteuid");

1778

}

1779

1062

1780

#ifdef __linux__

1063

1781

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1782

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

1065

1783

ret = klogctl(8, NULL, 5);

1066

1784

bool restore_loglevel = true;

1067

1785

if(ret == -1){

1068

1786

restore_loglevel = false;

1069

perror("klogctl");

1787

perror_plus("klogctl");

1070

1788

}

1071

1789

#endif /* __linux__ */

1072

1790

1073

1791

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

1792

if(sd < 0){

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1793

perror_plus("socket");

1794

exitcode = EX_OSERR;

1077

1795

#ifdef __linux__

1078

1796

if(restore_loglevel){

1079

1797

ret = klogctl(7, NULL, 0);

1080

1798

if(ret == -1){

1081

perror("klogctl");

1799

perror_plus("klogctl");

1082

1800

}

1083

1801

}

1084

1802

#endif /* __linux__ */

1803

/* Lower privileges */

1804

errno = 0;

1805

ret = seteuid(uid);

1806

if(ret == -1){

1807

perror_plus("seteuid");

1808

}

1085

1809

goto end;

1086

1810

}

1087

1811

strcpy(network.ifr_name, interface);

1088

1812

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

1089

1813

if(ret == -1){

1090

perror("ioctl SIOCGIFFLAGS");

1814

perror_plus("ioctl SIOCGIFFLAGS");

1091

1815

#ifdef __linux__

1092

1816

if(restore_loglevel){

1093

1817

ret = klogctl(7, NULL, 0);

1094

1818

if(ret == -1){

1095

perror("klogctl");

1819

perror_plus("klogctl");

1096

1820

}

1097

1821

}

1098

1822

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1823

exitcode = EX_OSERR;

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1100

1830

goto end;

1101

1831

}

1102

1832

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

1103

1833

network.ifr_flags |= IFF_UP;

1834

take_down_interface = true;

1104

1835

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

1105

1836

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1837

take_down_interface = false;

1838

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1839

exitcode = EX_OSERR;

1108

1840

#ifdef __linux__

1109

1841

if(restore_loglevel){

1110

1842

ret = klogctl(7, NULL, 0);

1111

1843

if(ret == -1){

1112

perror("klogctl");

1844

perror_plus("klogctl");

1113

1845

}

1114

1846

}

1115

1847

#endif /* __linux__ */

1848

/* Lower privileges */

1849

errno = 0;

1850

ret = seteuid(uid);

1851

if(ret == -1){

1852

perror_plus("seteuid");

1853

}

1116

1854

goto end;

1117

1855

}

1118

1856

}

1119

/* sleep checking until interface is running */

1857

/* Sleep checking until interface is running.

1858

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

1120

1859

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

1121

1860

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

1122

1861

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1862

perror_plus("ioctl SIOCGIFFLAGS");

1124

1863

} else if(network.ifr_flags & IFF_RUNNING){

1125

1864

break;

1126

1865

}

1127

1866

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1867

ret = nanosleep(&sleeptime, NULL);

1129

1868

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

1130

perror("nanosleep");

1869

perror_plus("nanosleep");

1131

1870

}

1132

1871

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1872

if(not take_down_interface){

1873

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

1874

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

1875

if(ret == -1){

1876

perror_plus("close");

1877

}

1136

1878

}

1137

1879

#ifdef __linux__

1138

1880

if(restore_loglevel){

1139

1881

/* Restores kernel loglevel to default */

1140

1882

ret = klogctl(7, NULL, 0);

1141

1883

if(ret == -1){

1142

perror("klogctl");

1884

perror_plus("klogctl");

1143

1885

}

1144

1886

}

1145

1887

#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");

1888

/* Lower privileges */

1889

errno = 0;

1890

if(take_down_interface){

1891

/* Lower privileges */

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1896

} else {

1897

/* Lower privileges permanently */

1898

ret = setuid(uid);

1899

if(ret == -1){

1900

perror_plus("setuid");

1901

}

1902

}

1903

}

1904

1905

if(quit_now){

1906

goto end;

1160

1907

}

1161

1908

1162

1909

ret = init_gnutls_global(pubkey, seckey);

1163

1910

if(ret == -1){

1164

1911

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

1165

exitcode = EXIT_FAILURE;

1912

exitcode = EX_UNAVAILABLE;

1166

1913

goto end;

1167

1914

} else {

1168

1915

gnutls_initialized = true;

1169

1916

}

1170

1917

1918

if(quit_now){

1919

goto end;

1920

}

1921

1171

1922

if(mkdtemp(tempdir) == NULL){

1172

perror("mkdtemp");

1923

perror_plus("mkdtemp");

1173

1924

goto end;

1174

1925

}

1175

1926

tempdir_created = true;

1176

1927

1928

if(quit_now){

1929

goto end;

1930

}

1931

1177

1932

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

1178

1933

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

1179

exitcode = EXIT_FAILURE;

1934

exitcode = EX_UNAVAILABLE;

1180

1935

goto end;

1181

1936

} else {

1182

1937

gpgme_initialized = true;

1183

1938

}

1184

1939

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

}

1940

if(quit_now){

1941

goto end;

1192

1942

}

1193

1943

1194

1944

if(connect_to != NULL){

1197

1947

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

1198

1948

if(address == NULL){

1199

1949

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1950

exitcode = EX_USAGE;

1951

goto end;

1952

}

1953

1954

if(quit_now){

1955

goto end;

1956

}

1957

1203

1958

uint16_t port;

1204

1959

errno = 0;

1205

1960

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

1206

1961

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

1207

1962

or tmpmax != (uint16_t)tmpmax){

1208

1963

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1964

exitcode = EX_USAGE;

1965

goto end;

1966

}

1967

1968

if(quit_now){

1969

goto end;

1970

}

1971

1212

1972

port = (uint16_t)tmpmax;

1213

1973

*address = '\0';

1214

address = connect_to;

1215

1974

/* Colon in address indicates IPv6 */

1216

1975

int af;

1217

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

1976

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

1218

1977

af = AF_INET6;

1978

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

1979

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

1980

{

1981

connect_to++;

1982

address[-1] = '\0';

1983

}

1219

1984

} else {

1220

1985

af = AF_INET;

1221

1986

}

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

1987

address = connect_to;

1988

1989

if(quit_now){

1990

goto end;

1991

}

1992

1993

while(not quit_now){

1994

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

1995

if(quit_now or ret == 0){

1996

break;

1997

}

1998

if(debug){

1999

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

2000

(int)retry_interval);

2001

}

2002

sleep((int)retry_interval);

2003

}

2004

2005

if (not quit_now){

1226

2006

exitcode = EXIT_SUCCESS;

1227

2007

}

1228

goto end;

1229

}

1230

2008

2009

goto end;

2010

}

2011

2012

if(quit_now){

2013

goto end;

2014

}

2015

1231

2016

{

1232

2017

AvahiServerConfig config;

1233

2018

/* Do not publish any local Zeroconf records */

1250

2035

if(mc.server == NULL){

1251

2036

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

1252

2037

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

2038

exitcode = EX_UNAVAILABLE;

2039

goto end;

2040

}

2041

2042

if(quit_now){

1254

2043

goto end;

1255

2044

}

1256

2045

1261

2050

if(sb == NULL){

1262

2051

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

1263

2052

avahi_strerror(avahi_server_errno(mc.server)));

1264

exitcode = EXIT_FAILURE;

2053

exitcode = EX_UNAVAILABLE;

2054

goto end;

2055

}

2056

2057

if(quit_now){

1265

2058

goto end;

1266

2059

}

1267

2060

1270

2063

if(debug){

1271

2064

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

1272

2065

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

2066

2067

ret = avahi_loop_with_timeout(mc.simple_poll,

2068

(int)(retry_interval * 1000));

2069

if(debug){

2070

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

2071

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

2072

}

1275

2073

1276

2074

end:

1277

2075

1298

2096

if(gpgme_initialized){

1299

2097

gpgme_release(mc.ctx);

1300

2098

}

1301

1302

/* Removes the temp directory used by GPGME */

2099

2100

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

2101

has seen */

2102

if(mc.current_server != NULL){

2103

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

2104

while(mc.current_server != NULL){

2105

server *next = mc.current_server->next;

2106

free(mc.current_server);

2107

mc.current_server = next;

2108

}

2109

}

2110

2111

/* XXX run network hooks "stop" here */

2112

2113

/* Take down the network interface */

2114

if(take_down_interface){

2115

/* Re-raise priviliges */

2116

errno = 0;

2117

ret = seteuid(0);

2118

if(ret == -1){

2119

perror_plus("seteuid");

2120

}

2121

if(geteuid() == 0){

2122

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

2123

if(ret == -1){

2124

perror_plus("ioctl SIOCGIFFLAGS");

2125

} else if(network.ifr_flags & IFF_UP) {

2126

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

2127

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

2128

if(ret == -1){

2129

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2130

}

2131

}

2132

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

2133

if(ret == -1){

2134

perror_plus("close");

2135

}

2136

/* Lower privileges permanently */

2137

errno = 0;

2138

ret = setuid(uid);

2139

if(ret == -1){

2140

perror_plus("setuid");

2141

}

2142

}

2143

}

2144

2145

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

1303

2146

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

}

2147

struct dirent **direntries = NULL;

2148

struct dirent *direntry = NULL;

2149

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

2150

alphasort);

2151

if (numentries > 0){

2152

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

2153

direntry = direntries[i];

1324

2154

char *fullname = NULL;

1325

2155

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

1326

2156

direntry->d_name);

1327

2157

if(ret < 0){

1328

perror("asprintf");

2158

perror_plus("asprintf");

1329

2159

continue;

1330

2160

}

1331

2161

ret = remove(fullname);

1335

2165

}

1336

2166

free(fullname);

1337

2167

}

1338

closedir(d);

2168

}

2169

2170

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

2171

free(direntries);

2172

if (numentries == -1){

2173

perror_plus("scandir");

1339

2174

}

1340

2175

ret = rmdir(tempdir);

1341

2176

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

1342

perror("rmdir");

1343

}

2177

perror_plus("rmdir");

2178

}

2179

}

2180

2181

if(quit_now){

2182

sigemptyset(&old_sigterm_action.sa_mask);

2183

old_sigterm_action.sa_handler = SIG_DFL;

2184

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2185

&old_sigterm_action,

2186

NULL));

2187

if(ret == -1){

2188

perror_plus("sigaction");

2189

}

2190

do {

2191

ret = raise(signal_received);

2192

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

2193

if(ret != 0){

2194

perror_plus("raise");

2195

abort();

2196

}

2197

TEMP_FAILURE_RETRY(pause());

1344

2198

}

1345

2199

1346

2200

return exitcode;