/mandos/trunk : revision 505.2.4

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

}

173

174

int fprintf_plus(FILE *stream, const char *format, ...){

175

va_list ap;

176

va_start (ap, format);

177

178

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));

179

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

180

}

144

181

145

182

/*

146

183

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

159

196

return buffer_capacity;

160

197

}

161

198

199

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

200

int add_server(const char *ip, uint16_t port,

201

AvahiIfIndex if_index,

202

int af){

203

int ret;

204

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

205

if(new_server == NULL){

206

perror_plus("malloc");

207

return -1;

208

}

209

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

210

.port = port,

211

.if_index = if_index,

212

.af = af };

213

if(new_server->ip == NULL){

214

perror_plus("strdup");

215

return -1;

216

}

217

/* Special case of first server */

218

if (mc.current_server == NULL){

219

new_server->next = new_server;

220

new_server->prev = new_server;

221

mc.current_server = new_server;

222

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

223

} else {

224

new_server->next = mc.current_server;

225

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

226

new_server->prev->next = new_server;

227

mc.current_server->prev = new_server;

228

}

229

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

230

if(ret == -1){

231

perror_plus("clock_gettime");

232

return -1;

233

}

234

return 0;

235

}

236

162

237

/*

163

238

* Initialize GPGME.

164

239

*/

165

240

static bool init_gpgme(const char *seckey,

166

241

const char *pubkey, const char *tempdir){

167

int ret;

168

242

gpgme_error_t rc;

169

243

gpgme_engine_info_t engine_info;

170

244

173

247

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

174

248

*/

175

249

bool import_key(const char *filename){

250

int ret;

176

251

int fd;

177

252

gpgme_data_t pgp_data;

178

253

179

254

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

180

255

if(fd == -1){

181

perror("open");

256

perror_plus("open");

182

257

return false;

183

258

}

184

259

198

273

199

274

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

200

275

if(ret == -1){

201

perror("close");

276

perror_plus("close");

202

277

}

203

278

gpgme_data_release(pgp_data);

204

279

return true;

217

292

return false;

218

293

}

219

294

220

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

295

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

221

296

rc = gpgme_get_engine_info(&engine_info);

222

297

if(rc != GPG_ERR_NO_ERROR){

223

298

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

249

324

return false;

250

325

}

251

326

252

return true;

327

return true;

253

328

}

254

329

255

330

/*

309

384

}

310

385

gpgme_recipient_t recipient;

311

386

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

}

387

while(recipient != NULL){

388

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

389

gpgme_pubkey_algo_name(recipient->pubkey_algo));

390

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

391

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

392

recipient->status == GPG_ERR_NO_SECKEY

393

? "No" : "Yes");

394

recipient = recipient->next;

322

395

}

323

396

}

324

397

}

331

404

332

405

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

333

406

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

334

perror("gpgme_data_seek");

407

perror_plus("gpgme_data_seek");

335

408

plaintext_length = -1;

336

409

goto decrypt_end;

337

410

}

342

415

(size_t)plaintext_length,

343

416

plaintext_capacity);

344

417

if(plaintext_capacity == 0){

345

perror("incbuffer");

418

perror_plus("incbuffer");

346

419

plaintext_length = -1;

347

420

goto decrypt_end;

348

421

}

355

428

break;

356

429

}

357

430

if(ret < 0){

358

perror("gpgme_data_read");

431

perror_plus("gpgme_data_read");

359

432

plaintext_length = -1;

360

433

goto decrypt_end;

361

434

}

418

491

}

419

492

420

493

/* OpenPGP credentials */

421

gnutls_certificate_allocate_credentials(&mc.cred);

494

ret = gnutls_certificate_allocate_credentials(&mc.cred);

422

495

if(ret != GNUTLS_E_SUCCESS){

423

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

424

from

425

-Wunreachable-code

426

*/

496

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

427

497

safer_gnutls_strerror(ret));

428

498

gnutls_global_deinit();

429

499

return -1;

476

546

static int init_gnutls_session(gnutls_session_t *session){

477

547

int ret;

478

548

/* GnuTLS session creation */

479

ret = gnutls_init(session, GNUTLS_SERVER);

549

do {

550

ret = gnutls_init(session, GNUTLS_SERVER);

551

if(quit_now){

552

return -1;

553

}

554

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

480

555

if(ret != GNUTLS_E_SUCCESS){

481

556

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

482

557

safer_gnutls_strerror(ret));

484

559

485

560

{

486

561

const char *err;

487

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

562

do {

563

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

564

if(quit_now){

565

gnutls_deinit(*session);

566

return -1;

567

}

568

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

488

569

if(ret != GNUTLS_E_SUCCESS){

489

570

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

490

571

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

494

575

}

495

576

}

496

577

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

578

do {

579

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

580

mc.cred);

581

if(quit_now){

582

gnutls_deinit(*session);

583

return -1;

584

}

585

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

499

586

if(ret != GNUTLS_E_SUCCESS){

500

587

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

501

588

safer_gnutls_strerror(ret));

504

591

}

505

592

506

593

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

594

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

595

510

596

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

597

520

606

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

521

607

AvahiIfIndex if_index,

522

608

int af){

523

int ret, tcp_sd;

609

int ret, tcp_sd = -1;

524

610

ssize_t sret;

525

611

union {

526

612

struct sockaddr_in in;

527

613

struct sockaddr_in6 in6;

528

614

} to;

529

615

char *buffer = NULL;

530

char *decrypted_buffer;

616

char *decrypted_buffer = NULL;

531

617

size_t buffer_length = 0;

532

618

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

619

size_t written;

535

int retval = 0;

620

int retval = -1;

536

621

gnutls_session_t session;

537

622

int pf; /* Protocol family */

538

623

624

errno = 0;

625

626

if(quit_now){

627

errno = EINTR;

628

return -1;

629

}

630

539

631

switch(af){

540

632

case AF_INET6:

541

633

pf = PF_INET6;

545

637

break;

546

638

default:

547

639

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

640

errno = EINVAL;

548

641

return -1;

549

642

}

550

643

560

653

561

654

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

655

if(tcp_sd < 0){

563

perror("socket");

564

return -1;

656

int e = errno;

657

perror_plus("socket");

658

errno = e;

659

goto mandos_end;

660

}

661

662

if(quit_now){

663

errno = EINTR;

664

goto mandos_end;

565

665

}

566

666

567

667

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

573

673

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

574

674

}

575

675

if(ret < 0 ){

576

perror("inet_pton");

577

return -1;

676

int e = errno;

677

perror_plus("inet_pton");

678

errno = e;

679

goto mandos_end;

578

680

}

579

681

if(ret == 0){

682

int e = errno;

580

683

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

581

return -1;

684

errno = e;

685

goto mandos_end;

582

686

}

583

687

if(af == AF_INET6){

584

688

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

591

695

if(if_index == AVAHI_IF_UNSPEC){

592

696

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

593

697

" without a network interface\n");

594

return -1;

698

errno = EINVAL;

699

goto mandos_end;

595

700

}

596

701

/* Set the network interface number as scope */

597

702

to.in6.sin6_scope_id = (uint32_t)if_index;

602

707

-Wunreachable-code */

603

708

}

604

709

710

if(quit_now){

711

errno = EINTR;

712

goto mandos_end;

713

}

714

605

715

if(debug){

606

716

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

607

717

char interface[IF_NAMESIZE];

608

718

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

609

perror("if_indextoname");

719

perror_plus("if_indextoname");

610

720

} else {

611

721

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

612

722

ip, interface, port);

626

736

sizeof(addrstr));

627

737

}

628

738

if(pcret == NULL){

629

perror("inet_ntop");

739

perror_plus("inet_ntop");

630

740

} else {

631

741

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

632

742

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

634

744

}

635

745

}

636

746

747

if(quit_now){

748

errno = EINTR;

749

goto mandos_end;

750

}

751

637

752

if(af == AF_INET6){

638

753

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

639

754

} else {

640

755

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

641

756

}

642

757

if(ret < 0){

643

perror("connect");

644

return -1;

758

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

759

int e = errno;

760

perror_plus("connect");

761

errno = e;

762

}

763

goto mandos_end;

764

}

765

766

if(quit_now){

767

errno = EINTR;

768

goto mandos_end;

645

769

}

646

770

647

771

const char *out = mandos_protocol_version;

651

775

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

652

776

out_size - written));

653

777

if(ret == -1){

654

perror("write");

655

retval = -1;

778

int e = errno;

779

perror_plus("write");

780

errno = e;

656

781

goto mandos_end;

657

782

}

658

783

written += (size_t)ret;

666

791

break;

667

792

}

668

793

}

794

795

if(quit_now){

796

errno = EINTR;

797

goto mandos_end;

798

}

669

799

}

670

800

671

801

if(debug){

672

802

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

673

803

}

674

804

805

if(quit_now){

806

errno = EINTR;

807

goto mandos_end;

808

}

809

810

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

675

811

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

812

677

do{

813

if(quit_now){

814

errno = EINTR;

815

goto mandos_end;

816

}

817

818

do {

678

819

ret = gnutls_handshake(session);

820

if(quit_now){

821

errno = EINTR;

822

goto mandos_end;

823

}

679

824

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

680

825

681

826

if(ret != GNUTLS_E_SUCCESS){

683

828

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

684

829

gnutls_perror(ret);

685

830

}

686

retval = -1;

831

errno = EPROTO;

687

832

goto mandos_end;

688

833

}

689

834

695

840

}

696

841

697

842

while(true){

843

844

if(quit_now){

845

errno = EINTR;

846

goto mandos_end;

847

}

848

698

849

buffer_capacity = incbuffer(&buffer, buffer_length,

699

850

buffer_capacity);

700

851

if(buffer_capacity == 0){

701

perror("incbuffer");

702

retval = -1;

852

int e = errno;

853

perror_plus("incbuffer");

854

errno = e;

855

goto mandos_end;

856

}

857

858

if(quit_now){

859

errno = EINTR;

703

860

goto mandos_end;

704

861

}

705

862

714

871

case GNUTLS_E_AGAIN:

715

872

break;

716

873

case GNUTLS_E_REHANDSHAKE:

717

do{

874

do {

718

875

ret = gnutls_handshake(session);

876

877

if(quit_now){

878

errno = EINTR;

879

goto mandos_end;

880

}

719

881

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

720

882

if(ret < 0){

721

883

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

722

884

gnutls_perror(ret);

723

retval = -1;

885

errno = EPROTO;

724

886

goto mandos_end;

725

887

}

726

888

break;

727

889

default:

728

890

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

729

891

" encrypted session with Mandos server\n");

730

retval = -1;

731

892

gnutls_bye(session, GNUTLS_SHUT_RDWR);

893

errno = EIO;

732

894

goto mandos_end;

733

895

}

734

896

} else {

740

902

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

741

903

}

742

904

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

905

if(quit_now){

906

errno = EINTR;

907

goto mandos_end;

908

}

909

910

do {

911

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

912

if(quit_now){

913

errno = EINTR;

914

goto mandos_end;

915

}

916

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

744

917

745

918

if(buffer_length > 0){

919

ssize_t decrypted_buffer_size;

746

920

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

921

buffer_length,

748

922

&decrypted_buffer);

749

923

if(decrypted_buffer_size >= 0){

924

750

925

written = 0;

751

926

while(written < (size_t) decrypted_buffer_size){

927

if(quit_now){

928

errno = EINTR;

929

goto mandos_end;

930

}

931

752

932

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

753

933

(size_t)decrypted_buffer_size - written,

754

934

stdout);

755

935

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

936

int e = errno;

756

937

if(debug){

757

938

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

758

939

strerror(errno));

759

940

}

760

retval = -1;

761

break;

941

errno = e;

942

goto mandos_end;

762

943

}

763

944

written += (size_t)ret;

764

945

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

946

retval = 0;

768

947

}

769

} else {

770

retval = -1;

771

948

}

772

949

773

950

/* Shutdown procedure */

774

951

775

952

mandos_end:

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

953

{

954

int e = errno;

955

free(decrypted_buffer);

956

free(buffer);

957

if(tcp_sd >= 0){

958

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

959

}

960

if(ret == -1){

961

if(e == 0){

962

e = errno;

963

}

964

perror_plus("close");

965

}

966

gnutls_deinit(session);

967

errno = e;

968

if(quit_now){

969

errno = EINTR;

970

retval = -1;

971

}

780

972

}

781

gnutls_deinit(session);

782

973

return retval;

783

974

}

784

975

801

992

/* Called whenever a service has been resolved successfully or

802

993

timed out */

803

994

995

if(quit_now){

996

return;

997

}

998

804

999

switch(event){

805

1000

default:

806

1001

case AVAHI_RESOLVER_FAILURE:

822

1017

avahi_proto_to_af(proto));

823

1018

if(ret == 0){

824

1019

avahi_simple_poll_quit(mc.simple_poll);

1020

} else {

1021

ret = add_server(ip, port, interface,

1022

avahi_proto_to_af(proto));

825

1023

}

826

1024

}

827

1025

}

843

1041

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

844

1042

is removed from the LAN */

845

1043

1044

if(quit_now){

1045

return;

1046

}

1047

846

1048

switch(event){

847

1049

default:

848

1050

case AVAHI_BROWSER_FAILURE:

877

1079

}

878

1080

}

879

1081

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){

1082

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

1083

static void handle_sigterm(int sig){

884

1084

if(quit_now){

885

1085

return;

886

1086

}

887

1087

quit_now = 1;

1088

signal_received = sig;

888

1089

int old_errno = errno;

1090

/* set main loop to exit */

889

1091

if(mc.simple_poll != NULL){

890

1092

avahi_simple_poll_quit(mc.simple_poll);

891

1093

}

892

1094

errno = old_errno;

893

1095

}

894

1096

1097

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

1098

int ret;

1099

1100

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

1101

if(s < 0){

1102

perror_plus("socket");

1103

return false;

1104

}

1105

strcpy(ifr->ifr_name, ifname);

1106

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1107

if(ret == -1){

1108

if(debug){

1109

perror_plus("ioctl SIOCGIFFLAGS");

1110

}

1111

return false;

1112

}

1113

return true;

1114

}

1115

1116

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

1117

1118

/* Reject the loopback device */

1119

if(ifr->ifr_flags & IFF_LOOPBACK){

1120

if(debug){

1121

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

1122

ifname);

1123

}

1124

return false;

1125

}

1126

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

1127

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

1128

if(debug){

1129

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

1130

ifname);

1131

}

1132

return true;

1133

}

1134

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

1135

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

1136

if(debug){

1137

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

1138

ifname);

1139

}

1140

return false;

1141

}

1142

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

1143

if(ifr->ifr_flags & IFF_NOARP){

1144

if(debug){

1145

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

1146

}

1147

return false;

1148

}

1149

1150

/* Accept this device */

1151

if(debug){

1152

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

1153

}

1154

return true;

1155

}

1156

1157

/*

1158

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

1159

* corresponds to an acceptable network device.

1160

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

1161

*/

1162

int good_interface(const struct dirent *if_entry){

1163

int ret;

1164

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

1165

return 0;

1166

}

1167

struct ifreq ifr;

1168

1169

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

1170

return 0;

1171

}

1172

1173

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

1174

return 0;

1175

}

1176

return 1;

1177

}

1178

1179

/*

1180

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

1181

* corresponds to an acceptable network device which is up.

1182

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

1183

*/

1184

int up_interface(const struct dirent *if_entry){

1185

ssize_t ssret;

1186

char *flagname = NULL;

1187

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

1188

return 0;

1189

}

1190

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

1191

if_entry->d_name);

1192

if(ret < 0){

1193

perror_plus("asprintf");

1194

return 0;

1195

}

1196

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

1197

if(flags_fd == -1){

1198

perror_plus("open");

1199

free(flagname);

1200

return 0;

1201

}

1202

free(flagname);

1203

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

1204

/* read line from flags_fd */

1205

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

1206

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

1207

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

1208

if(flagstring == NULL){

1209

perror_plus("malloc");

1210

close(flags_fd);

1211

return 0;

1212

}

1213

while(to_read > 0){

1214

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

1215

(size_t)to_read));

1216

if(ssret == -1){

1217

perror_plus("read");

1218

free(flagstring);

1219

close(flags_fd);

1220

return 0;

1221

}

1222

to_read -= ssret;

1223

if(ssret == 0){

1224

break;

1225

}

1226

}

1227

close(flags_fd);

1228

intmax_t tmpmax;

1229

char *tmp;

1230

errno = 0;

1231

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

1232

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

1233

and not (isspace(*tmp)))

1234

or tmpmax != (ifreq_flags)tmpmax){

1235

if(debug){

1236

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

1237

flagstring, if_entry->d_name);

1238

}

1239

free(flagstring);

1240

return 0;

1241

}

1242

free(flagstring);

1243

ifreq_flags flags = (ifreq_flags)tmpmax;

1244

/* Reject the loopback device */

1245

if(flags & IFF_LOOPBACK){

1246

if(debug){

1247

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

1248

if_entry->d_name);

1249

}

1250

return 0;

1251

}

1252

1253

/* Reject down interfaces */

1254

if(not (flags & IFF_UP)){

1255

return 0;

1256

}

1257

1258

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

1259

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

1260

if(debug){

1261

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

1262

if_entry->d_name);

1263

}

1264

return 1;

1265

}

1266

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

1267

if(not (flags & IFF_BROADCAST)){

1268

if(debug){

1269

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

1270

if_entry->d_name);

1271

}

1272

return 0;

1273

}

1274

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

1275

if(flags & IFF_NOARP){

1276

if(debug){

1277

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

1278

if_entry->d_name);

1279

}

1280

return 0;

1281

}

1282

/* Accept this device */

1283

if(debug){

1284

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

1285

if_entry->d_name);

1286

}

1287

return 1;

1288

}

1289

1290

int notdotentries(const struct dirent *direntry){

1291

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

1292

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

1293

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

1294

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

1295

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

1296

return 0;

1297

}

1298

return 1;

1299

}

1300

1301

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

1302

int runnable_hook(const struct dirent *direntry){

1303

int ret;

1304

struct stat st;

1305

1306

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

1307

/* Empty name? */

1308

return 0;

1309

}

1310

1311

/* Save pointer to last character */

1312

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

1313

1314

if(*end == '~'){

1315

/* Backup name~ */

1316

return 0;

1317

}

1318

1319

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

1320

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

1321

/* Temporary #name# */

1322

return 0;

1323

}

1324

1325

/* XXX more rules here */

1326

1327

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

1328

if(ret == -1){

1329

if(debug){

1330

perror_plus("Could not stat plugin");

1331

}

1332

return 0;

1333

}

1334

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

1335

/* Not a regular file */

1336

return 0;

1337

}

1338

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

1339

/* Not executable */

1340

return 0;

1341

}

1342

return 1;

1343

}

1344

1345

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1346

int ret;

1347

struct timespec now;

1348

struct timespec waited_time;

1349

intmax_t block_time;

1350

1351

while(true){

1352

if(mc.current_server == NULL){

1353

if (debug){

1354

fprintf(stderr,

1355

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

1356

}

1357

ret = avahi_simple_poll_iterate(s, -1);

1358

} else {

1359

if (debug){

1360

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

1361

" or wait\n");

1362

}

1363

/* the current time */

1364

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1365

if(ret == -1){

1366

perror_plus("clock_gettime");

1367

return -1;

1368

}

1369

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

1370

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

1371

waited_time.tv_sec = (now.tv_sec

1372

- mc.current_server->last_seen.tv_sec);

1373

waited_time.tv_nsec = (now.tv_nsec

1374

- mc.current_server->last_seen.tv_nsec);

1375

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

1376

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

1377

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

1378

block_time = ((retry_interval

1379

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

1380

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

1381

1382

if (debug){

1383

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

1384

}

1385

1386

if(block_time <= 0){

1387

ret = start_mandos_communication(mc.current_server->ip,

1388

mc.current_server->port,

1389

mc.current_server->if_index,

1390

mc.current_server->af);

1391

if(ret == 0){

1392

avahi_simple_poll_quit(mc.simple_poll);

1393

return 0;

1394

}

1395

ret = clock_gettime(CLOCK_MONOTONIC,

1396

&mc.current_server->last_seen);

1397

if(ret == -1){

1398

perror_plus("clock_gettime");

1399

return -1;

1400

}

1401

mc.current_server = mc.current_server->next;

1402

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

1403

servers, but don't block */

1404

}

1405

1406

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

1407

}

1408

if(ret != 0){

1409

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

1410

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

1411

}

1412

}

1413

}

1414

}

1415

895

1416

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

896

1417

AvahiSServiceBrowser *sb = NULL;

897

1418

int error;

899

1420

intmax_t tmpmax;

900

1421

char *tmp;

901

1422

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1423

const char *interface = "";

903

1424

struct ifreq network;

904

int sd;

1425

int sd = -1;

1426

bool take_down_interface = false;

905

1427

uid_t uid;

906

1428

gid_t gid;

907

char *connect_to = NULL;

908

1429

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

909

1430

bool tempdir_created = false;

910

1431

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

914

1435

bool gnutls_initialized = false;

915

1436

bool gpgme_initialized = false;

916

1437

float delay = 2.5f;

1438

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

1439

retrying the same server again */

917

1440

918

struct sigaction old_sigterm_action;

1441

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1442

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1443

1444

uid = getuid();

1445

gid = getgid();

1446

1447

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

1448

errno = 0;

1449

ret = setgid(gid);

1450

if(ret == -1){

1451

perror_plus("setgid");

1452

}

1453

1454

/* Lower user privileges (temporarily) */

1455

errno = 0;

1456

ret = seteuid(uid);

1457

if(ret == -1){

1458

perror_plus("seteuid");

1459

}

1460

1461

if(quit_now){

1462

goto end;

1463

}

1464

921

1465

{

922

1466

struct argp_option options[] = {

923

1467

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

952

1496

.arg = "SECONDS",

953

1497

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

954

1498

.group = 2 },

1499

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

1500

.arg = "SECONDS",

1501

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

1502

.group = 2 },

1503

/*

1504

* These reproduce what we would get without ARGP_NO_HELP

1505

*/

1506

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

1507

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

1508

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

1509

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

1510

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

1511

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

955

1512

{ .name = NULL }

956

1513

};

957

1514

958

1515

error_t parse_opt(int key, char *arg,

959

1516

struct argp_state *state){

1517

errno = 0;

960

1518

switch(key){

961

1519

case 128: /* --debug */

962

1520

debug = true;

978

1536

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

979

1537

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

980

1538

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

981

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

982

exit(EXIT_FAILURE);

1539

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

983

1540

}

984

1541

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

985

1542

break;

990

1547

errno = 0;

991

1548

delay = strtof(arg, &tmp);

992

1549

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

993

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

994

exit(EXIT_FAILURE);

1550

argp_error(state, "Bad delay");

1551

}

1552

case 132: /* --retry */

1553

errno = 0;

1554

retry_interval = strtod(arg, &tmp);

1555

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

1556

or (retry_interval * 1000) > INT_MAX

1557

or retry_interval < 0){

1558

argp_error(state, "Bad retry interval");

995

1559

}

996

1560

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1561

/*

1562

* These reproduce what we would get without ARGP_NO_HELP

1563

*/

1564

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

1565

argp_state_help(state, state->out_stream,

1566

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1567

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1568

case -3: /* --usage */

1569

argp_state_help(state, state->out_stream,

1570

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1571

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

1572

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

1573

exit(argp_err_exit_status);

1000

1574

break;

1001

1575

default:

1002

1576

return ARGP_ERR_UNKNOWN;

1003

1577

}

1004

return 0;

1578

return errno;

1005

1579

}

1006

1580

1007

1581

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

1008

1582

.args_doc = "",

1009

1583

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

1010

1584

" 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

}

1585

ret = argp_parse(&argp, argc, argv,

1586

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1587

switch(ret){

1588

case 0:

1589

break;

1590

case ENOMEM:

1591

default:

1592

errno = ret;

1593

perror_plus("argp_parse");

1594

exitcode = EX_OSERR;

1595

goto end;

1596

case EINVAL:

1597

exitcode = EX_USAGE;

1598

goto end;

1599

}

1600

}

1601

1602

{

1603

/* Work around Debian bug #633582:

1604

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

1605

struct stat st;

1606

1607

/* Re-raise priviliges */

1608

errno = 0;

1609

ret = seteuid(0);

1610

if(ret == -1){

1611

perror_plus("seteuid");

1612

}

1613

1614

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

1615

int seckey_fd = open(seckey, O_RDONLY);

1616

if(seckey_fd == -1){

1617

perror_plus("open");

1618

} else {

1619

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

1620

if(ret == -1){

1621

perror_plus("fstat");

1622

} else {

1623

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

1624

ret = fchown(seckey_fd, uid, gid);

1625

if(ret == -1){

1626

perror_plus("fchown");

1627

}

1628

}

1629

}

1630

TEMP_FAILURE_RETRY(close(seckey_fd));

1631

}

1632

}

1633

1634

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

1635

int pubkey_fd = open(pubkey, O_RDONLY);

1636

if(pubkey_fd == -1){

1637

perror_plus("open");

1638

} else {

1639

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

1640

if(ret == -1){

1641

perror_plus("fstat");

1642

} else {

1643

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

1644

ret = fchown(pubkey_fd, uid, gid);

1645

if(ret == -1){

1646

perror_plus("fchown");

1647

}

1648

}

1649

}

1650

TEMP_FAILURE_RETRY(close(pubkey_fd));

1651

}

1652

}

1653

1654

/* Lower privileges */

1655

errno = 0;

1656

ret = seteuid(uid);

1657

if(ret == -1){

1658

perror_plus("seteuid");

1659

}

1660

}

1661

1662

/* Find network hooks and run them */

1663

{

1664

struct dirent **direntries;

1665

struct dirent *direntry;

1666

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

1667

alphasort);

1668

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

1669

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

1670

direntry = direntries[0];

1671

char *fullname = NULL;

1672

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

1673

direntry->d_name);

1674

if(ret < 0){

1675

perror_plus("asprintf");

1676

continue;

1677

}

1678

pid_t hook_pid = fork();

1679

if(hook_pid == 0){

1680

/* Child */

1681

dup2(devnull, STDIN_FILENO);

1682

close(devnull);

1683

dup2(STDERR_FILENO, STDOUT_FILENO);

1684

setenv("DEVICE", interface, 1);

1685

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

1686

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

1687

/* setenv( XXX more here */

1688

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

1689

perror_plus("execl");

1690

}

1691

free(fullname);

1692

if(quit_now){

1693

goto end;

1694

}

1695

}

1696

close(devnull);

1017

1697

}

1018

1698

1019

1699

if(not debug){

1020

1700

avahi_set_log_function(empty_log);

1021

1701

}

1022

1702

1703

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

1704

struct dirent **direntries;

1705

ret = scandir(sys_class_net, &direntries, good_interface,

1706

alphasort);

1707

if(ret >= 1){

1708

/* Pick the first good interface */

1709

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

1710

if(debug){

1711

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

1712

}

1713

if(interface == NULL){

1714

perror_plus("malloc");

1715

free(direntries);

1716

exitcode = EXIT_FAILURE;

1717

goto end;

1718

}

1719

free(direntries);

1720

} else {

1721

free(direntries);

1722

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

1723

exitcode = EXIT_FAILURE;

1724

goto end;

1725

}

1726

}

1727

1023

1728

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

1024

1729

from the signal handler */

1025

1730

/* Initialize the pseudo-RNG for Avahi */

1027

1732

mc.simple_poll = avahi_simple_poll_new();

1028

1733

if(mc.simple_poll == NULL){

1029

1734

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

1030

exitcode = EXIT_FAILURE;

1735

exitcode = EX_UNAVAILABLE;

1031

1736

goto end;

1032

1737

}

1033

1738

1034

1739

sigemptyset(&sigterm_action.sa_mask);

1035

1740

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

1036

1741

if(ret == -1){

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1742

perror_plus("sigaddset");

1743

exitcode = EX_OSERR;

1039

1744

goto end;

1040

1745

}

1041

1746

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

1042

1747

if(ret == -1){

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1748

perror_plus("sigaddset");

1749

exitcode = EX_OSERR;

1045

1750

goto end;

1046

1751

}

1047

1752

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

1048

1753

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

}

1754

perror_plus("sigaddset");

1755

exitcode = EX_OSERR;

1756

goto end;

1757

}

1758

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

1759

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

1760

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

1761

*/

1762

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

1763

if(ret == -1){

1764

perror_plus("sigaction");

1765

return EX_OSERR;

1766

}

1767

if(old_sigterm_action.sa_handler != SIG_IGN){

1768

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

1769

if(ret == -1){

1770

perror_plus("sigaction");

1771

exitcode = EX_OSERR;

1772

goto end;

1773

}

1774

}

1775

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

1776

if(ret == -1){

1777

perror_plus("sigaction");

1778

return EX_OSERR;

1779

}

1780

if(old_sigterm_action.sa_handler != SIG_IGN){

1781

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

1782

if(ret == -1){

1783

perror_plus("sigaction");

1784

exitcode = EX_OSERR;

1785

goto end;

1786

}

1787

}

1788

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

1789

if(ret == -1){

1790

perror_plus("sigaction");

1791

return EX_OSERR;

1792

}

1793

if(old_sigterm_action.sa_handler != SIG_IGN){

1794

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

1795

if(ret == -1){

1796

perror_plus("sigaction");

1797

exitcode = EX_OSERR;

1798

goto end;

1799

}

1800

}

1059

1801

1060

1802

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

1061

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

1803

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

1804

if_index = (AvahiIfIndex) if_nametoindex(interface);

1805

if(if_index == 0){

1806

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

1807

exitcode = EX_UNAVAILABLE;

1808

goto end;

1809

}

1810

1811

if(quit_now){

1812

goto end;

1813

}

1814

1815

/* Re-raise priviliges */

1816

errno = 0;

1817

ret = seteuid(0);

1818

if(ret == -1){

1819

perror_plus("seteuid");

1820

}

1821

1062

1822

#ifdef __linux__

1063

1823

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1824

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

1065

1825

ret = klogctl(8, NULL, 5);

1066

1826

bool restore_loglevel = true;

1067

1827

if(ret == -1){

1068

1828

restore_loglevel = false;

1069

perror("klogctl");

1829

perror_plus("klogctl");

1070

1830

}

1071

1831

#endif /* __linux__ */

1072

1832

1073

1833

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

1834

if(sd < 0){

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1835

perror_plus("socket");

1836

exitcode = EX_OSERR;

1077

1837

#ifdef __linux__

1078

1838

if(restore_loglevel){

1079

1839

ret = klogctl(7, NULL, 0);

1080

1840

if(ret == -1){

1081

perror("klogctl");

1841

perror_plus("klogctl");

1082

1842

}

1083

1843

}

1084

1844

#endif /* __linux__ */

1845

/* Lower privileges */

1846

errno = 0;

1847

ret = seteuid(uid);

1848

if(ret == -1){

1849

perror_plus("seteuid");

1850

}

1085

1851

goto end;

1086

1852

}

1087

1853

strcpy(network.ifr_name, interface);

1088

1854

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

1089

1855

if(ret == -1){

1090

perror("ioctl SIOCGIFFLAGS");

1856

perror_plus("ioctl SIOCGIFFLAGS");

1091

1857

#ifdef __linux__

1092

1858

if(restore_loglevel){

1093

1859

ret = klogctl(7, NULL, 0);

1094

1860

if(ret == -1){

1095

perror("klogctl");

1861

perror_plus("klogctl");

1096

1862

}

1097

1863

}

1098

1864

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1865

exitcode = EX_OSERR;

1866

/* Lower privileges */

1867

errno = 0;

1868

ret = seteuid(uid);

1869

if(ret == -1){

1870

perror_plus("seteuid");

1871

}

1100

1872

goto end;

1101

1873

}

1102

1874

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

1103

1875

network.ifr_flags |= IFF_UP;

1876

take_down_interface = true;

1104

1877

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

1105

1878

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1879

take_down_interface = false;

1880

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1881

exitcode = EX_OSERR;

1108

1882

#ifdef __linux__

1109

1883

if(restore_loglevel){

1110

1884

ret = klogctl(7, NULL, 0);

1111

1885

if(ret == -1){

1112

perror("klogctl");

1886

perror_plus("klogctl");

1113

1887

}

1114

1888

}

1115

1889

#endif /* __linux__ */

1890

/* Lower privileges */

1891

errno = 0;

1892

ret = seteuid(uid);

1893

if(ret == -1){

1894

perror_plus("seteuid");

1895

}

1116

1896

goto end;

1117

1897

}

1118

1898

}

1119

/* sleep checking until interface is running */

1899

/* Sleep checking until interface is running.

1900

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

1120

1901

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

1121

1902

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

1122

1903

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1904

perror_plus("ioctl SIOCGIFFLAGS");

1124

1905

} else if(network.ifr_flags & IFF_RUNNING){

1125

1906

break;

1126

1907

}

1127

1908

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1909

ret = nanosleep(&sleeptime, NULL);

1129

1910

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

1130

perror("nanosleep");

1911

perror_plus("nanosleep");

1131

1912

}

1132

1913

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1914

if(not take_down_interface){

1915

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

1916

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

1917

if(ret == -1){

1918

perror_plus("close");

1919

}

1136

1920

}

1137

1921

#ifdef __linux__

1138

1922

if(restore_loglevel){

1139

1923

/* Restores kernel loglevel to default */

1140

1924

ret = klogctl(7, NULL, 0);

1141

1925

if(ret == -1){

1142

perror("klogctl");

1926

perror_plus("klogctl");

1143

1927

}

1144

1928

}

1145

1929

#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");

1930

/* Lower privileges */

1931

errno = 0;

1932

if(take_down_interface){

1933

/* Lower privileges */

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

1938

} else {

1939

/* Lower privileges permanently */

1940

ret = setuid(uid);

1941

if(ret == -1){

1942

perror_plus("setuid");

1943

}

1944

}

1945

}

1946

1947

if(quit_now){

1948

goto end;

1160

1949

}

1161

1950

1162

1951

ret = init_gnutls_global(pubkey, seckey);

1163

1952

if(ret == -1){

1164

1953

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

1165

exitcode = EXIT_FAILURE;

1954

exitcode = EX_UNAVAILABLE;

1166

1955

goto end;

1167

1956

} else {

1168

1957

gnutls_initialized = true;

1169

1958

}

1170

1959

1960

if(quit_now){

1961

goto end;

1962

}

1963

1171

1964

if(mkdtemp(tempdir) == NULL){

1172

perror("mkdtemp");

1965

perror_plus("mkdtemp");

1173

1966

goto end;

1174

1967

}

1175

1968

tempdir_created = true;

1176

1969

1970

if(quit_now){

1971

goto end;

1972

}

1973

1177

1974

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

1178

1975

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

1179

exitcode = EXIT_FAILURE;

1976

exitcode = EX_UNAVAILABLE;

1180

1977

goto end;

1181

1978

} else {

1182

1979

gpgme_initialized = true;

1183

1980

}

1184

1981

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

}

1982

if(quit_now){

1983

goto end;

1192

1984

}

1193

1985

1194

1986

if(connect_to != NULL){

1197

1989

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

1198

1990

if(address == NULL){

1199

1991

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1992

exitcode = EX_USAGE;

1993

goto end;

1994

}

1995

1996

if(quit_now){

1997

goto end;

1998

}

1999

1203

2000

uint16_t port;

1204

2001

errno = 0;

1205

2002

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

1206

2003

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

1207

2004

or tmpmax != (uint16_t)tmpmax){

1208

2005

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

2006

exitcode = EX_USAGE;

2007

goto end;

2008

}

2009

2010

if(quit_now){

2011

goto end;

2012

}

2013

1212

2014

port = (uint16_t)tmpmax;

1213

2015

*address = '\0';

1214

address = connect_to;

1215

2016

/* Colon in address indicates IPv6 */

1216

2017

int af;

1217

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

2018

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

1218

2019

af = AF_INET6;

2020

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

2021

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

2022

{

2023

connect_to++;

2024

address[-1] = '\0';

2025

}

1219

2026

} else {

1220

2027

af = AF_INET;

1221

2028

}

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

2029

address = connect_to;

2030

2031

if(quit_now){

2032

goto end;

2033

}

2034

2035

while(not quit_now){

2036

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

2037

if(quit_now or ret == 0){

2038

break;

2039

}

2040

if(debug){

2041

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

2042

(int)retry_interval);

2043

}

2044

sleep((int)retry_interval);

2045

}

2046

2047

if (not quit_now){

1226

2048

exitcode = EXIT_SUCCESS;

1227

2049

}

1228

goto end;

1229

}

1230

2050

2051

goto end;

2052

}

2053

2054

if(quit_now){

2055

goto end;

2056

}

2057

1231

2058

{

1232

2059

AvahiServerConfig config;

1233

2060

/* Do not publish any local Zeroconf records */

1250

2077

if(mc.server == NULL){

1251

2078

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

1252

2079

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

2080

exitcode = EX_UNAVAILABLE;

2081

goto end;

2082

}

2083

2084

if(quit_now){

1254

2085

goto end;

1255

2086

}

1256

2087

1261

2092

if(sb == NULL){

1262

2093

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

1263

2094

avahi_strerror(avahi_server_errno(mc.server)));

1264

exitcode = EXIT_FAILURE;

2095

exitcode = EX_UNAVAILABLE;

2096

goto end;

2097

}

2098

2099

if(quit_now){

1265

2100

goto end;

1266

2101

}

1267

2102

1270

2105

if(debug){

1271

2106

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

1272

2107

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

2108

2109

ret = avahi_loop_with_timeout(mc.simple_poll,

2110

(int)(retry_interval * 1000));

2111

if(debug){

2112

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

2113

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

2114

}

1275

2115

1276

2116

end:

1277

2117

1298

2138

if(gpgme_initialized){

1299

2139

gpgme_release(mc.ctx);

1300

2140

}

1301

1302

/* Removes the temp directory used by GPGME */

2141

2142

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

2143

has seen */

2144

if(mc.current_server != NULL){

2145

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

2146

while(mc.current_server != NULL){

2147

server *next = mc.current_server->next;

2148

free(mc.current_server);

2149

mc.current_server = next;

2150

}

2151

}

2152

2153

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

2154

2155

/* Take down the network interface */

2156

if(take_down_interface){

2157

/* Re-raise priviliges */

2158

errno = 0;

2159

ret = seteuid(0);

2160

if(ret == -1){

2161

perror_plus("seteuid");

2162

}

2163

if(geteuid() == 0){

2164

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

2165

if(ret == -1){

2166

perror_plus("ioctl SIOCGIFFLAGS");

2167

} else if(network.ifr_flags & IFF_UP) {

2168

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

2169

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

2170

if(ret == -1){

2171

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2172

}

2173

}

2174

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

2175

if(ret == -1){

2176

perror_plus("close");

2177

}

2178

/* Lower privileges permanently */

2179

errno = 0;

2180

ret = setuid(uid);

2181

if(ret == -1){

2182

perror_plus("setuid");

2183

}

2184

}

2185

}

2186

2187

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

1303

2188

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

}

2189

struct dirent **direntries = NULL;

2190

struct dirent *direntry = NULL;

2191

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

2192

alphasort);

2193

if (numentries > 0){

2194

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

2195

direntry = direntries[i];

1324

2196

char *fullname = NULL;

1325

2197

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

1326

2198

direntry->d_name);

1327

2199

if(ret < 0){

1328

perror("asprintf");

2200

perror_plus("asprintf");

1329

2201

continue;

1330

2202

}

1331

2203

ret = remove(fullname);

1335

2207

}

1336

2208

free(fullname);

1337

2209

}

1338

closedir(d);

2210

}

2211

2212

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

2213

free(direntries);

2214

if (numentries == -1){

2215

perror_plus("scandir");

1339

2216

}

1340

2217

ret = rmdir(tempdir);

1341

2218

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

1342

perror("rmdir");

1343

}

2219

perror_plus("rmdir");

2220

}

2221

}

2222

2223

if(quit_now){

2224

sigemptyset(&old_sigterm_action.sa_mask);

2225

old_sigterm_action.sa_handler = SIG_DFL;

2226

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2227

&old_sigterm_action,

2228

NULL));

2229

if(ret == -1){

2230

perror_plus("sigaction");

2231

}

2232

do {

2233

ret = raise(signal_received);

2234

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

2235

if(ret != 0){

2236

perror_plus("raise");

2237

abort();

2238

}

2239

TEMP_FAILURE_RETRY(pause());

1344

2240

}

1345

2241

1346

2242

return exitcode;