/mandos/release : revision 237.15.3

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() */

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

int ret;

1156

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

1157

return 0;

1158

}

1159

struct ifreq ifr;

1160

1161

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

1162

return 0;

1163

}

1164

1165

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

1166

return 0;

1167

}

1168

return 1;

1169

}

1170

1171

/*

1172

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

1173

* corresponds to an acceptable network device which is up.

1174

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

1175

*/

1176

int up_interface(const struct dirent *if_entry){

1177

ssize_t ssret;

1178

char *flagname = NULL;

1179

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

1180

return 0;

1181

}

1182

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1183

if_entry->d_name);

1184

if(ret < 0){

1185

perror_plus("asprintf");

1186

return 0;

1187

}

1188

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1189

if(flags_fd == -1){

1190

perror_plus("open");

1191

free(flagname);

1192

return 0;

1193

}

1194

free(flagname);

1195

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1196

/* read line from flags_fd */

1197

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1198

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1199

flagstring[(size_t)to_read] = '\0';

1200

if(flagstring == NULL){

1201

perror_plus("malloc");

1202

close(flags_fd);

1203

return 0;

1204

}

1205

while(to_read > 0){

1206

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1207

(size_t)to_read));

1208

if(ssret == -1){

1209

perror_plus("read");

1210

free(flagstring);

1211

close(flags_fd);

1212

return 0;

1213

}

1214

to_read -= ssret;

1215

if(ssret == 0){

1216

break;

1217

}

1218

}

1219

close(flags_fd);

1220

intmax_t tmpmax;

1221

char *tmp;

1222

errno = 0;

1223

tmpmax = strtoimax(flagstring, &tmp, 0);

1224

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

1225

and not (isspace(*tmp)))

1226

or tmpmax != (ifreq_flags)tmpmax){

1227

if(debug){

1228

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1229

flagstring, if_entry->d_name);

1230

}

1231

free(flagstring);

1232

return 0;

1233

}

1234

free(flagstring);

1235

ifreq_flags flags = (ifreq_flags)tmpmax;

1236

/* Reject the loopback device */

1237

if(flags & IFF_LOOPBACK){

1238

if(debug){

1239

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

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

/* Reject down interfaces */

1246

if(not (flags & IFF_UP)){

1247

return 0;

1248

}

1249

1250

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

1251

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1252

if(debug){

1253

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

1254

if_entry->d_name);

1255

}

1256

return 1;

1257

}

1258

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

1259

if(not (flags & IFF_BROADCAST)){

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 0;

1265

}

1266

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

1267

if(flags & IFF_NOARP){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

/* Accept this device */

1275

if(debug){

1276

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

1277

if_entry->d_name);

1278

}

1279

return 1;

1280

}

1281

1282

int notdotentries(const struct dirent *direntry){

1283

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

1284

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

1285

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

1286

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

1287

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

1288

return 0;

1289

}

1290

return 1;

1291

}

1292

1293

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

1294

int runnable_hook(const struct dirent *direntry){

1295

int ret;

1296

struct stat st;

1297

1298

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

1299

/* Empty name? */

1300

return 0;

1301

}

1302

1303

/* Save pointer to last character */

1304

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

1305

1306

if(*end == '~'){

1307

/* Backup name~ */

1308

return 0;

1309

}

1310

1311

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

1312

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

1313

/* Temporary #name# */

1314

return 0;

1315

}

1316

1317

/* XXX more rules here */

1318

1319

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

1320

if(ret == -1){

1321

if(debug){

1322

perror_plus("Could not stat plugin");

1323

}

1324

return 0;

1325

}

1326

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

1327

/* Not a regular file */

1328

return 0;

1329

}

1330

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

1331

/* Not executable */

1332

return 0;

1333

}

1334

return 1;

1335

}

1336

1337

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1338

int ret;

1339

struct timespec now;

1340

struct timespec waited_time;

1341

intmax_t block_time;

1342

1343

while(true){

1344

if(mc.current_server == NULL){

1345

if (debug){

1346

fprintf(stderr,

1347

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

1348

}

1349

ret = avahi_simple_poll_iterate(s, -1);

1350

} else {

1351

if (debug){

1352

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

1353

" or wait\n");

1354

}

1355

/* the current time */

1356

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1357

if(ret == -1){

1358

perror_plus("clock_gettime");

1359

return -1;

1360

}

1361

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

1362

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

1363

waited_time.tv_sec = (now.tv_sec

1364

- mc.current_server->last_seen.tv_sec);

1365

waited_time.tv_nsec = (now.tv_nsec

1366

- mc.current_server->last_seen.tv_nsec);

1367

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

1368

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

1369

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

1370

block_time = ((retry_interval

1371

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

1372

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

1373

1374

if (debug){

1375

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

1376

}

1377

1378

if(block_time <= 0){

1379

ret = start_mandos_communication(mc.current_server->ip,

1380

mc.current_server->port,

1381

mc.current_server->if_index,

1382

mc.current_server->af);

1383

if(ret == 0){

1384

avahi_simple_poll_quit(mc.simple_poll);

1385

return 0;

1386

}

1387

ret = clock_gettime(CLOCK_MONOTONIC,

1388

&mc.current_server->last_seen);

1389

if(ret == -1){

1390

perror_plus("clock_gettime");

1391

return -1;

1392

}

1393

mc.current_server = mc.current_server->next;

1394

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

1395

servers, but don't block */

1396

}

1397

1398

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

1399

}

1400

if(ret != 0){

1401

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

1402

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

1403

}

1404

}

1405

}

1406

}

1407

895

1408

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

896

1409

AvahiSServiceBrowser *sb = NULL;

897

1410

int error;

899

1412

intmax_t tmpmax;

900

1413

char *tmp;

901

1414

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1415

const char *interface = "";

903

1416

struct ifreq network;

904

int sd;

1417

int sd = -1;

1418

bool take_down_interface = false;

905

1419

uid_t uid;

906

1420

gid_t gid;

907

char *connect_to = NULL;

908

1421

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

909

1422

bool tempdir_created = false;

910

1423

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

914

1427

bool gnutls_initialized = false;

915

1428

bool gpgme_initialized = false;

916

1429

float delay = 2.5f;

1430

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

1431

retrying the same server again */

917

1432

918

struct sigaction old_sigterm_action;

1433

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1434

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1435

1436

uid = getuid();

1437

gid = getgid();

1438

1439

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

1440

errno = 0;

1441

ret = setgid(gid);

1442

if(ret == -1){

1443

perror_plus("setgid");

1444

}

1445

1446

/* Lower user privileges (temporarily) */

1447

errno = 0;

1448

ret = seteuid(uid);

1449

if(ret == -1){

1450

perror_plus("seteuid");

1451

}

1452

1453

if(quit_now){

1454

goto end;

1455

}

1456

921

1457

{

922

1458

struct argp_option options[] = {

923

1459

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

952

1488

.arg = "SECONDS",

953

1489

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

954

1490

.group = 2 },

1491

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

1492

.arg = "SECONDS",

1493

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

1494

.group = 2 },

1495

/*

1496

* These reproduce what we would get without ARGP_NO_HELP

1497

*/

1498

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

1499

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

1500

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

1501

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

1502

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

1503

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

955

1504

{ .name = NULL }

956

1505

};

957

1506

958

1507

error_t parse_opt(int key, char *arg,

959

1508

struct argp_state *state){

1509

errno = 0;

960

1510

switch(key){

961

1511

case 128: /* --debug */

962

1512

debug = true;

978

1528

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

979

1529

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

980

1530

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

981

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

982

exit(EXIT_FAILURE);

1531

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

983

1532

}

984

1533

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

985

1534

break;

990

1539

errno = 0;

991

1540

delay = strtof(arg, &tmp);

992

1541

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

993

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

994

exit(EXIT_FAILURE);

1542

argp_error(state, "Bad delay");

1543

}

1544

case 132: /* --retry */

1545

errno = 0;

1546

retry_interval = strtod(arg, &tmp);

1547

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

1548

or (retry_interval * 1000) > INT_MAX

1549

or retry_interval < 0){

1550

argp_error(state, "Bad retry interval");

995

1551

}

996

1552

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1553

/*

1554

* These reproduce what we would get without ARGP_NO_HELP

1555

*/

1556

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

1557

argp_state_help(state, state->out_stream,

1558

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1559

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1560

case -3: /* --usage */

1561

argp_state_help(state, state->out_stream,

1562

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1563

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

1564

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

1565

exit(argp_err_exit_status);

1000

1566

break;

1001

1567

default:

1002

1568

return ARGP_ERR_UNKNOWN;

1003

1569

}

1004

return 0;

1570

return errno;

1005

1571

}

1006

1572

1007

1573

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

1008

1574

.args_doc = "",

1009

1575

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

1010

1576

" 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

}

1577

ret = argp_parse(&argp, argc, argv,

1578

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1579

switch(ret){

1580

case 0:

1581

break;

1582

case ENOMEM:

1583

default:

1584

errno = ret;

1585

perror_plus("argp_parse");

1586

exitcode = EX_OSERR;

1587

goto end;

1588

case EINVAL:

1589

exitcode = EX_USAGE;

1590

goto end;

1591

}

1592

}

1593

1594

{

1595

/* Work around Debian bug #633582:

1596

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

1597

struct stat st;

1598

1599

/* Re-raise priviliges */

1600

errno = 0;

1601

ret = seteuid(0);

1602

if(ret == -1){

1603

perror_plus("seteuid");

1604

}

1605

1606

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

1607

int seckey_fd = open(seckey, O_RDONLY);

1608

if(seckey_fd == -1){

1609

perror_plus("open");

1610

} else {

1611

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

1612

if(ret == -1){

1613

perror_plus("fstat");

1614

} else {

1615

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

1616

ret = fchown(seckey_fd, uid, gid);

1617

if(ret == -1){

1618

perror_plus("fchown");

1619

}

1620

}

1621

}

1622

TEMP_FAILURE_RETRY(close(seckey_fd));

1623

}

1624

}

1625

1626

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

1627

int pubkey_fd = open(pubkey, O_RDONLY);

1628

if(pubkey_fd == -1){

1629

perror_plus("open");

1630

} else {

1631

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

1632

if(ret == -1){

1633

perror_plus("fstat");

1634

} else {

1635

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

1636

ret = fchown(pubkey_fd, uid, gid);

1637

if(ret == -1){

1638

perror_plus("fchown");

1639

}

1640

}

1641

}

1642

TEMP_FAILURE_RETRY(close(pubkey_fd));

1643

}

1644

}

1645

1646

/* Lower privileges */

1647

errno = 0;

1648

ret = seteuid(uid);

1649

if(ret == -1){

1650

perror_plus("seteuid");

1651

}

1652

}

1653

1654

/* Find network hooks and run them */

1655

{

1656

struct dirent **direntries;

1657

struct dirent *direntry;

1658

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

1659

alphasort);

1660

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

1661

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

1662

direntry = direntries[0];

1663

char *fullname = NULL;

1664

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

1665

direntry->d_name);

1666

if(ret < 0){

1667

perror_plus("asprintf");

1668

continue;

1669

}

1670

pid_t hook_pid = fork();

1671

if(hook_pid == 0){

1672

/* Child */

1673

dup2(devnull, STDIN_FILENO);

1674

close(devnull);

1675

dup2(STDERR_FILENO, STDOUT_FILENO);

1676

setenv("DEVICE", interface, 1);

1677

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

1678

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

1679

/* setenv( XXX more here */

1680

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

1681

perror_plus("execl");

1682

}

1683

free(fullname);

1684

if(quit_now){

1685

goto end;

1686

}

1687

}

1688

close(devnull);

1017

1689

}

1018

1690

1019

1691

if(not debug){

1020

1692

avahi_set_log_function(empty_log);

1021

1693

}

1022

1694

1695

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

1696

struct dirent **direntries;

1697

ret = scandir(sys_class_net, &direntries, good_interface,

1698

alphasort);

1699

if(ret >= 1){

1700

/* Pick the first good interface */

1701

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

1702

if(debug){

1703

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

1704

}

1705

if(interface == NULL){

1706

perror_plus("malloc");

1707

free(direntries);

1708

exitcode = EXIT_FAILURE;

1709

goto end;

1710

}

1711

free(direntries);

1712

} else {

1713

free(direntries);

1714

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

1715

exitcode = EXIT_FAILURE;

1716

goto end;

1717

}

1718

}

1719

1023

1720

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

1024

1721

from the signal handler */

1025

1722

/* Initialize the pseudo-RNG for Avahi */

1027

1724

mc.simple_poll = avahi_simple_poll_new();

1028

1725

if(mc.simple_poll == NULL){

1029

1726

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

1030

exitcode = EXIT_FAILURE;

1727

exitcode = EX_UNAVAILABLE;

1031

1728

goto end;

1032

1729

}

1033

1730

1034

1731

sigemptyset(&sigterm_action.sa_mask);

1035

1732

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

1036

1733

if(ret == -1){

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1734

perror_plus("sigaddset");

1735

exitcode = EX_OSERR;

1039

1736

goto end;

1040

1737

}

1041

1738

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

1042

1739

if(ret == -1){

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1740

perror_plus("sigaddset");

1741

exitcode = EX_OSERR;

1045

1742

goto end;

1046

1743

}

1047

1744

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

1048

1745

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

}

1746

perror_plus("sigaddset");

1747

exitcode = EX_OSERR;

1748

goto end;

1749

}

1750

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

1751

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

1752

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

1753

*/

1754

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

1755

if(ret == -1){

1756

perror_plus("sigaction");

1757

return EX_OSERR;

1758

}

1759

if(old_sigterm_action.sa_handler != SIG_IGN){

1760

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

1761

if(ret == -1){

1762

perror_plus("sigaction");

1763

exitcode = EX_OSERR;

1764

goto end;

1765

}

1766

}

1767

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

1768

if(ret == -1){

1769

perror_plus("sigaction");

1770

return EX_OSERR;

1771

}

1772

if(old_sigterm_action.sa_handler != SIG_IGN){

1773

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

1774

if(ret == -1){

1775

perror_plus("sigaction");

1776

exitcode = EX_OSERR;

1777

goto end;

1778

}

1779

}

1780

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

1781

if(ret == -1){

1782

perror_plus("sigaction");

1783

return EX_OSERR;

1784

}

1785

if(old_sigterm_action.sa_handler != SIG_IGN){

1786

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

1787

if(ret == -1){

1788

perror_plus("sigaction");

1789

exitcode = EX_OSERR;

1790

goto end;

1791

}

1792

}

1059

1793

1060

1794

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

1061

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

1795

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

1796

if_index = (AvahiIfIndex) if_nametoindex(interface);

1797

if(if_index == 0){

1798

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

1799

exitcode = EX_UNAVAILABLE;

1800

goto end;

1801

}

1802

1803

if(quit_now){

1804

goto end;

1805

}

1806

1807

/* Re-raise priviliges */

1808

errno = 0;

1809

ret = seteuid(0);

1810

if(ret == -1){

1811

perror_plus("seteuid");

1812

}

1813

1062

1814

#ifdef __linux__

1063

1815

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1816

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

1065

1817

ret = klogctl(8, NULL, 5);

1066

1818

bool restore_loglevel = true;

1067

1819

if(ret == -1){

1068

1820

restore_loglevel = false;

1069

perror("klogctl");

1821

perror_plus("klogctl");

1070

1822

}

1071

1823

#endif /* __linux__ */

1072

1824

1073

1825

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

1826

if(sd < 0){

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1827

perror_plus("socket");

1828

exitcode = EX_OSERR;

1077

1829

#ifdef __linux__

1078

1830

if(restore_loglevel){

1079

1831

ret = klogctl(7, NULL, 0);

1080

1832

if(ret == -1){

1081

perror("klogctl");

1833

perror_plus("klogctl");

1082

1834

}

1083

1835

}

1084

1836

#endif /* __linux__ */

1837

/* Lower privileges */

1838

errno = 0;

1839

ret = seteuid(uid);

1840

if(ret == -1){

1841

perror_plus("seteuid");

1842

}

1085

1843

goto end;

1086

1844

}

1087

1845

strcpy(network.ifr_name, interface);

1088

1846

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

1089

1847

if(ret == -1){

1090

perror("ioctl SIOCGIFFLAGS");

1848

perror_plus("ioctl SIOCGIFFLAGS");

1091

1849

#ifdef __linux__

1092

1850

if(restore_loglevel){

1093

1851

ret = klogctl(7, NULL, 0);

1094

1852

if(ret == -1){

1095

perror("klogctl");

1853

perror_plus("klogctl");

1096

1854

}

1097

1855

}

1098

1856

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1857

exitcode = EX_OSERR;

1858

/* Lower privileges */

1859

errno = 0;

1860

ret = seteuid(uid);

1861

if(ret == -1){

1862

perror_plus("seteuid");

1863

}

1100

1864

goto end;

1101

1865

}

1102

1866

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

1103

1867

network.ifr_flags |= IFF_UP;

1868

take_down_interface = true;

1104

1869

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

1105

1870

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1871

take_down_interface = false;

1872

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1873

exitcode = EX_OSERR;

1108

1874

#ifdef __linux__

1109

1875

if(restore_loglevel){

1110

1876

ret = klogctl(7, NULL, 0);

1111

1877

if(ret == -1){

1112

perror("klogctl");

1878

perror_plus("klogctl");

1113

1879

}

1114

1880

}

1115

1881

#endif /* __linux__ */

1882

/* Lower privileges */

1883

errno = 0;

1884

ret = seteuid(uid);

1885

if(ret == -1){

1886

perror_plus("seteuid");

1887

}

1116

1888

goto end;

1117

1889

}

1118

1890

}

1119

/* sleep checking until interface is running */

1891

/* Sleep checking until interface is running.

1892

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

1120

1893

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

1121

1894

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

1122

1895

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1896

perror_plus("ioctl SIOCGIFFLAGS");

1124

1897

} else if(network.ifr_flags & IFF_RUNNING){

1125

1898

break;

1126

1899

}

1127

1900

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1901

ret = nanosleep(&sleeptime, NULL);

1129

1902

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

1130

perror("nanosleep");

1903

perror_plus("nanosleep");

1131

1904

}

1132

1905

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1906

if(not take_down_interface){

1907

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

1908

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

1909

if(ret == -1){

1910

perror_plus("close");

1911

}

1136

1912

}

1137

1913

#ifdef __linux__

1138

1914

if(restore_loglevel){

1139

1915

/* Restores kernel loglevel to default */

1140

1916

ret = klogctl(7, NULL, 0);

1141

1917

if(ret == -1){

1142

perror("klogctl");

1918

perror_plus("klogctl");

1143

1919

}

1144

1920

}

1145

1921

#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");

1922

/* Lower privileges */

1923

errno = 0;

1924

if(take_down_interface){

1925

/* Lower privileges */

1926

ret = seteuid(uid);

1927

if(ret == -1){

1928

perror_plus("seteuid");

1929

}

1930

} else {

1931

/* Lower privileges permanently */

1932

ret = setuid(uid);

1933

if(ret == -1){

1934

perror_plus("setuid");

1935

}

1936

}

1937

}

1938

1939

if(quit_now){

1940

goto end;

1160

1941

}

1161

1942

1162

1943

ret = init_gnutls_global(pubkey, seckey);

1163

1944

if(ret == -1){

1164

1945

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

1165

exitcode = EXIT_FAILURE;

1946

exitcode = EX_UNAVAILABLE;

1166

1947

goto end;

1167

1948

} else {

1168

1949

gnutls_initialized = true;

1169

1950

}

1170

1951

1952

if(quit_now){

1953

goto end;

1954

}

1955

1171

1956

if(mkdtemp(tempdir) == NULL){

1172

perror("mkdtemp");

1957

perror_plus("mkdtemp");

1173

1958

goto end;

1174

1959

}

1175

1960

tempdir_created = true;

1176

1961

1962

if(quit_now){

1963

goto end;

1964

}

1965

1177

1966

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

1178

1967

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

1179

exitcode = EXIT_FAILURE;

1968

exitcode = EX_UNAVAILABLE;

1180

1969

goto end;

1181

1970

} else {

1182

1971

gpgme_initialized = true;

1183

1972

}

1184

1973

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

}

1974

if(quit_now){

1975

goto end;

1192

1976

}

1193

1977

1194

1978

if(connect_to != NULL){

1197

1981

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

1198

1982

if(address == NULL){

1199

1983

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1984

exitcode = EX_USAGE;

1985

goto end;

1986

}

1987

1988

if(quit_now){

1989

goto end;

1990

}

1991

1203

1992

uint16_t port;

1204

1993

errno = 0;

1205

1994

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

1206

1995

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

1207

1996

or tmpmax != (uint16_t)tmpmax){

1208

1997

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1998

exitcode = EX_USAGE;

1999

goto end;

2000

}

2001

2002

if(quit_now){

2003

goto end;

2004

}

2005

1212

2006

port = (uint16_t)tmpmax;

1213

2007

*address = '\0';

1214

address = connect_to;

1215

2008

/* Colon in address indicates IPv6 */

1216

2009

int af;

1217

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

2010

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

1218

2011

af = AF_INET6;

2012

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

2013

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

2014

{

2015

connect_to++;

2016

address[-1] = '\0';

2017

}

1219

2018

} else {

1220

2019

af = AF_INET;

1221

2020

}

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

2021

address = connect_to;

2022

2023

if(quit_now){

2024

goto end;

2025

}

2026

2027

while(not quit_now){

2028

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

2029

if(quit_now or ret == 0){

2030

break;

2031

}

2032

if(debug){

2033

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

2034

(int)retry_interval);

2035

}

2036

sleep((int)retry_interval);

2037

}

2038

2039

if (not quit_now){

1226

2040

exitcode = EXIT_SUCCESS;

1227

2041

}

1228

goto end;

1229

}

1230

2042

2043

goto end;

2044

}

2045

2046

if(quit_now){

2047

goto end;

2048

}

2049

1231

2050

{

1232

2051

AvahiServerConfig config;

1233

2052

/* Do not publish any local Zeroconf records */

1250

2069

if(mc.server == NULL){

1251

2070

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

1252

2071

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

2072

exitcode = EX_UNAVAILABLE;

2073

goto end;

2074

}

2075

2076

if(quit_now){

1254

2077

goto end;

1255

2078

}

1256

2079

1261

2084

if(sb == NULL){

1262

2085

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

1263

2086

avahi_strerror(avahi_server_errno(mc.server)));

1264

exitcode = EXIT_FAILURE;

2087

exitcode = EX_UNAVAILABLE;

2088

goto end;

2089

}

2090

2091

if(quit_now){

1265

2092

goto end;

1266

2093

}

1267

2094

1270

2097

if(debug){

1271

2098

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

1272

2099

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

2100

2101

ret = avahi_loop_with_timeout(mc.simple_poll,

2102

(int)(retry_interval * 1000));

2103

if(debug){

2104

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

2105

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

2106

}

1275

2107

1276

2108

end:

1277

2109

1298

2130

if(gpgme_initialized){

1299

2131

gpgme_release(mc.ctx);

1300

2132

}

1301

1302

/* Removes the temp directory used by GPGME */

2133

2134

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

2135

has seen */

2136

if(mc.current_server != NULL){

2137

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

2138

while(mc.current_server != NULL){

2139

server *next = mc.current_server->next;

2140

free(mc.current_server);

2141

mc.current_server = next;

2142

}

2143

}

2144

2145

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

2146

2147

/* Take down the network interface */

2148

if(take_down_interface){

2149

/* Re-raise priviliges */

2150

errno = 0;

2151

ret = seteuid(0);

2152

if(ret == -1){

2153

perror_plus("seteuid");

2154

}

2155

if(geteuid() == 0){

2156

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

2157

if(ret == -1){

2158

perror_plus("ioctl SIOCGIFFLAGS");

2159

} else if(network.ifr_flags & IFF_UP) {

2160

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

2161

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

2162

if(ret == -1){

2163

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2164

}

2165

}

2166

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

2167

if(ret == -1){

2168

perror_plus("close");

2169

}

2170

/* Lower privileges permanently */

2171

errno = 0;

2172

ret = setuid(uid);

2173

if(ret == -1){

2174

perror_plus("setuid");

2175

}

2176

}

2177

}

2178

2179

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

1303

2180

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

}

2181

struct dirent **direntries = NULL;

2182

struct dirent *direntry = NULL;

2183

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

2184

alphasort);

2185

if (numentries > 0){

2186

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

2187

direntry = direntries[i];

1324

2188

char *fullname = NULL;

1325

2189

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

1326

2190

direntry->d_name);

1327

2191

if(ret < 0){

1328

perror("asprintf");

2192

perror_plus("asprintf");

1329

2193

continue;

1330

2194

}

1331

2195

ret = remove(fullname);

1335

2199

}

1336

2200

free(fullname);

1337

2201

}

1338

closedir(d);

2202

}

2203

2204

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

2205

free(direntries);

2206

if (numentries == -1){

2207

perror_plus("scandir");

1339

2208

}

1340

2209

ret = rmdir(tempdir);

1341

2210

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

1342

perror("rmdir");

1343

}

2211

perror_plus("rmdir");

2212

}

2213

}

2214

2215

if(quit_now){

2216

sigemptyset(&old_sigterm_action.sa_mask);

2217

old_sigterm_action.sa_handler = SIG_DFL;

2218

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2219

&old_sigterm_action,

2220

NULL));

2221

if(ret == -1){

2222

perror_plus("sigaction");

2223

}

2224

do {

2225

ret = raise(signal_received);

2226

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

2227

if(ret != 0){

2228

perror_plus("raise");

2229

abort();

2230

}

2231

TEMP_FAILURE_RETRY(pause());

1344

2232

}

1345

2233

1346

2234

return exitcode;