/mandos/release : revision 237.11.7

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

srand(), strtof() */

46

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

47

strtof(), abort() */

48

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

49

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

50

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

62

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

63

strtoimax() */

64

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

65

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

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

71

72

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

73

*/

73

74

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

74

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

75

setgid() */

76

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

75

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

76

setgid(), pause() */

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

80

81

argp_parse(), ARGP_KEY_ARG,

81

82

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

83

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

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

84

sigaction(), SIGTERM, sig_atomic_t,

85

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

85

88

86

89

#ifdef __linux__

87

90

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

124

127

bool debug = false;

125

128

static const char mandos_protocol_version[] = "1";

126

129

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

127

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

130

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

131

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

132

char *connect_to = NULL;

133

134

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

135

typedef struct server{

136

const char *ip;

137

uint16_t port;

138

AvahiIfIndex if_index;

139

int af;

140

struct timespec last_seen;

141

struct server *next;

142

struct server *prev;

143

} server;

128

144

129

145

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

130

146

typedef struct {

135

151

gnutls_dh_params_t dh_params;

136

152

const char *priority;

137

153

gpgme_ctx_t ctx;

154

server *current_server;

138

155

} mandos_context;

139

156

140

157

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

141

158

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

142

159

.dh_bits = 1024, .priority = "SECURE256"

143

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

160

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

161

.current_server = NULL };

162

163

sig_atomic_t quit_now = 0;

164

int signal_received = 0;

165

166

/* Function to use when printing errors */

167

void perror_plus(const char *print_text){

168

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

169

program_invocation_short_name);

170

perror(print_text);

171

}

144

172

145

173

/*

146

174

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

159

187

return buffer_capacity;

160

188

}

161

189

190

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

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

194

int ret;

195

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

196

if(new_server == NULL){

197

perror_plus("malloc");

198

return -1;

199

}

200

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

201

.port = port,

202

.if_index = if_index,

203

.af = af };

204

if(new_server->ip == NULL){

205

perror_plus("strdup");

206

return -1;

207

}

208

/* Special case of first server */

209

if (mc.current_server == NULL){

210

new_server->next = new_server;

211

new_server->prev = new_server;

212

mc.current_server = new_server;

213

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

214

} else {

215

new_server->next = mc.current_server;

216

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

217

new_server->prev->next = new_server;

218

mc.current_server->prev = new_server;

219

}

220

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

221

if(ret == -1){

222

perror_plus("clock_gettime");

223

return -1;

224

}

225

return 0;

226

}

227

162

228

/*

163

229

* Initialize GPGME.

164

230

*/

165

231

static bool init_gpgme(const char *seckey,

166

232

const char *pubkey, const char *tempdir){

167

int ret;

168

233

gpgme_error_t rc;

169

234

gpgme_engine_info_t engine_info;

170

235

173

238

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

174

239

*/

175

240

bool import_key(const char *filename){

241

int ret;

176

242

int fd;

177

243

gpgme_data_t pgp_data;

178

244

179

245

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

180

246

if(fd == -1){

181

perror("open");

247

perror_plus("open");

182

248

return false;

183

249

}

184

250

198

264

199

265

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

200

266

if(ret == -1){

201

perror("close");

267

perror_plus("close");

202

268

}

203

269

gpgme_data_release(pgp_data);

204

270

return true;

217

283

return false;

218

284

}

219

285

220

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

286

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

221

287

rc = gpgme_get_engine_info(&engine_info);

222

288

if(rc != GPG_ERR_NO_ERROR){

223

289

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

249

315

return false;

250

316

}

251

317

252

return true;

318

return true;

253

319

}

254

320

255

321

/*

329

395

330

396

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

331

397

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

332

perror("gpgme_data_seek");

398

perror_plus("gpgme_data_seek");

333

399

plaintext_length = -1;

334

400

goto decrypt_end;

335

401

}

340

406

(size_t)plaintext_length,

341

407

plaintext_capacity);

342

408

if(plaintext_capacity == 0){

343

perror("incbuffer");

409

perror_plus("incbuffer");

344

410

plaintext_length = -1;

345

411

goto decrypt_end;

346

412

}

353

419

break;

354

420

}

355

421

if(ret < 0){

356

perror("gpgme_data_read");

422

perror_plus("gpgme_data_read");

357

423

plaintext_length = -1;

358

424

goto decrypt_end;

359

425

}

416

482

}

417

483

418

484

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

486

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

487

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

425

488

safer_gnutls_strerror(ret));

426

489

gnutls_global_deinit();

427

490

return -1;

474

537

static int init_gnutls_session(gnutls_session_t *session){

475

538

int ret;

476

539

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

540

do {

541

ret = gnutls_init(session, GNUTLS_SERVER);

542

if(quit_now){

543

return -1;

544

}

545

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

478

546

if(ret != GNUTLS_E_SUCCESS){

479

547

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

480

548

safer_gnutls_strerror(ret));

482

550

483

551

{

484

552

const char *err;

485

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

553

do {

554

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

555

if(quit_now){

556

gnutls_deinit(*session);

557

return -1;

558

}

559

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

486

560

if(ret != GNUTLS_E_SUCCESS){

487

561

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

488

562

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

492

566

}

493

567

}

494

568

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

569

do {

570

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

571

mc.cred);

572

if(quit_now){

573

gnutls_deinit(*session);

574

return -1;

575

}

576

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

497

577

if(ret != GNUTLS_E_SUCCESS){

498

578

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

499

579

safer_gnutls_strerror(ret));

502

582

}

503

583

504

584

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

586

508

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

588

518

597

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

519

598

AvahiIfIndex if_index,

520

599

int af){

521

int ret, tcp_sd;

600

int ret, tcp_sd = -1;

522

601

ssize_t sret;

523

602

union {

524

603

struct sockaddr_in in;

525

604

struct sockaddr_in6 in6;

526

605

} to;

527

606

char *buffer = NULL;

528

char *decrypted_buffer;

607

char *decrypted_buffer = NULL;

529

608

size_t buffer_length = 0;

530

609

size_t buffer_capacity = 0;

531

ssize_t decrypted_buffer_size;

532

610

size_t written;

533

int retval = 0;

611

int retval = -1;

534

612

gnutls_session_t session;

535

613

int pf; /* Protocol family */

536

614

615

errno = 0;

616

617

if(quit_now){

618

errno = EINTR;

619

return -1;

620

}

621

537

622

switch(af){

538

623

case AF_INET6:

539

624

pf = PF_INET6;

543

628

break;

544

629

default:

545

630

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

631

errno = EINVAL;

546

632

return -1;

547

633

}

548

634

558

644

559

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

560

646

if(tcp_sd < 0){

561

perror("socket");

562

return -1;

647

int e = errno;

648

perror_plus("socket");

649

errno = e;

650

goto mandos_end;

651

}

652

653

if(quit_now){

654

errno = EINTR;

655

goto mandos_end;

563

656

}

564

657

565

658

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

571

664

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

572

665

}

573

666

if(ret < 0 ){

574

perror("inet_pton");

575

return -1;

667

int e = errno;

668

perror_plus("inet_pton");

669

errno = e;

670

goto mandos_end;

576

671

}

577

672

if(ret == 0){

673

int e = errno;

578

674

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

579

return -1;

675

errno = e;

676

goto mandos_end;

580

677

}

581

678

if(af == AF_INET6){

582

679

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

589

686

if(if_index == AVAHI_IF_UNSPEC){

590

687

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

591

688

" without a network interface\n");

592

return -1;

689

errno = EINVAL;

690

goto mandos_end;

593

691

}

594

692

/* Set the network interface number as scope */

595

693

to.in6.sin6_scope_id = (uint32_t)if_index;

600

698

-Wunreachable-code */

601

699

}

602

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

704

}

705

603

706

if(debug){

604

707

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

605

708

char interface[IF_NAMESIZE];

606

709

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

607

perror("if_indextoname");

710

perror_plus("if_indextoname");

608

711

} else {

609

712

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

610

713

ip, interface, port);

624

727

sizeof(addrstr));

625

728

}

626

729

if(pcret == NULL){

627

perror("inet_ntop");

730

perror_plus("inet_ntop");

628

731

} else {

629

732

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

630

733

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

632

735

}

633

736

}

634

737

738

if(quit_now){

739

errno = EINTR;

740

goto mandos_end;

741

}

742

635

743

if(af == AF_INET6){

636

744

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

637

745

} else {

638

746

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

639

747

}

640

748

if(ret < 0){

641

perror("connect");

642

return -1;

749

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

750

int e = errno;

751

perror_plus("connect");

752

errno = e;

753

}

754

goto mandos_end;

755

}

756

757

if(quit_now){

758

errno = EINTR;

759

goto mandos_end;

643

760

}

644

761

645

762

const char *out = mandos_protocol_version;

649

766

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

650

767

out_size - written));

651

768

if(ret == -1){

652

perror("write");

653

retval = -1;

769

int e = errno;

770

perror_plus("write");

771

errno = e;

654

772

goto mandos_end;

655

773

}

656

774

written += (size_t)ret;

664

782

break;

665

783

}

666

784

}

785

786

if(quit_now){

787

errno = EINTR;

788

goto mandos_end;

789

}

667

790

}

668

791

669

792

if(debug){

670

793

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

671

794

}

672

795

796

if(quit_now){

797

errno = EINTR;

798

goto mandos_end;

799

}

800

801

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

673

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

674

803

675

do{

804

if(quit_now){

805

errno = EINTR;

806

goto mandos_end;

807

}

808

809

do {

676

810

ret = gnutls_handshake(session);

811

if(quit_now){

812

errno = EINTR;

813

goto mandos_end;

814

}

677

815

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

678

816

679

817

if(ret != GNUTLS_E_SUCCESS){

681

819

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

682

820

gnutls_perror(ret);

683

821

}

684

retval = -1;

822

errno = EPROTO;

685

823

goto mandos_end;

686

824

}

687

825

693

831

}

694

832

695

833

while(true){

834

835

if(quit_now){

836

errno = EINTR;

837

goto mandos_end;

838

}

839

696

840

buffer_capacity = incbuffer(&buffer, buffer_length,

697

841

buffer_capacity);

698

842

if(buffer_capacity == 0){

699

perror("incbuffer");

700

retval = -1;

843

int e = errno;

844

perror_plus("incbuffer");

845

errno = e;

846

goto mandos_end;

847

}

848

849

if(quit_now){

850

errno = EINTR;

701

851

goto mandos_end;

702

852

}

703

853

712

862

case GNUTLS_E_AGAIN:

713

863

break;

714

864

case GNUTLS_E_REHANDSHAKE:

715

do{

865

do {

716

866

ret = gnutls_handshake(session);

867

868

if(quit_now){

869

errno = EINTR;

870

goto mandos_end;

871

}

717

872

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

718

873

if(ret < 0){

719

874

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

720

875

gnutls_perror(ret);

721

retval = -1;

876

errno = EPROTO;

722

877

goto mandos_end;

723

878

}

724

879

break;

725

880

default:

726

881

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

727

882

" encrypted session with Mandos server\n");

728

retval = -1;

729

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

errno = EIO;

730

885

goto mandos_end;

731

886

}

732

887

} else {

738

893

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

739

894

}

740

895

741

gnutls_bye(session, GNUTLS_SHUT_RDWR);

896

if(quit_now){

897

errno = EINTR;

898

goto mandos_end;

899

}

900

901

do {

902

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

903

if(quit_now){

904

errno = EINTR;

905

goto mandos_end;

906

}

907

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

742

908

743

909

if(buffer_length > 0){

910

ssize_t decrypted_buffer_size;

744

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

745

912

buffer_length,

746

913

&decrypted_buffer);

747

914

if(decrypted_buffer_size >= 0){

915

748

916

written = 0;

749

917

while(written < (size_t) decrypted_buffer_size){

918

if(quit_now){

919

errno = EINTR;

920

goto mandos_end;

921

}

922

750

923

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

751

924

(size_t)decrypted_buffer_size - written,

752

925

stdout);

753

926

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

927

int e = errno;

754

928

if(debug){

755

929

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

756

930

strerror(errno));

757

931

}

758

retval = -1;

759

break;

932

errno = e;

933

goto mandos_end;

760

934

}

761

935

written += (size_t)ret;

762

936

}

763

free(decrypted_buffer);

764

} else {

765

retval = -1;

937

retval = 0;

766

938

}

767

} else {

768

retval = -1;

769

939

}

770

940

771

941

/* Shutdown procedure */

772

942

773

943

mandos_end:

774

free(buffer);

775

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

776

if(ret == -1){

777

perror("close");

944

{

945

int e = errno;

946

free(decrypted_buffer);

947

free(buffer);

948

if(tcp_sd >= 0){

949

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

950

}

951

if(ret == -1){

952

if(e == 0){

953

e = errno;

954

}

955

perror_plus("close");

956

}

957

gnutls_deinit(session);

958

errno = e;

959

if(quit_now){

960

errno = EINTR;

961

retval = -1;

962

}

778

963

}

779

gnutls_deinit(session);

780

964

return retval;

781

965

}

782

966

799

983

/* Called whenever a service has been resolved successfully or

800

984

timed out */

801

985

986

if(quit_now){

987

return;

988

}

989

802

990

switch(event){

803

991

default:

804

992

case AVAHI_RESOLVER_FAILURE:

820

1008

avahi_proto_to_af(proto));

821

1009

if(ret == 0){

822

1010

avahi_simple_poll_quit(mc.simple_poll);

1011

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

823

1014

}

824

1015

}

825

1016

}

841

1032

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

842

1033

is removed from the LAN */

843

1034

1035

if(quit_now){

1036

return;

1037

}

1038

844

1039

switch(event){

845

1040

default:

846

1041

case AVAHI_BROWSER_FAILURE:

875

1070

}

876

1071

}

877

1072

878

sig_atomic_t quit_now = 0;

879

880

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

881

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

1073

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

1074

static void handle_sigterm(int sig){

882

1075

if(quit_now){

883

1076

return;

884

1077

}

885

1078

quit_now = 1;

1079

signal_received = sig;

886

1080

int old_errno = errno;

1081

/* set main loop to exit */

887

1082

if(mc.simple_poll != NULL){

888

1083

avahi_simple_poll_quit(mc.simple_poll);

889

1084

}

890

1085

errno = old_errno;

891

1086

}

892

1087

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1144

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1147

}

1148

free(flagstring);

1149

return 0;

1150

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1153

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1155

if(debug){

1156

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

1157

if_entry->d_name);

1158

}

1159

return 0;

1160

}

1161

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

1162

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

1163

if(debug){

1164

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

1165

if_entry->d_name);

1166

}

1167

return 1;

1168

}

1169

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

1170

if(not (flags & IFF_BROADCAST)){

1171

if(debug){

1172

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

1173

if_entry->d_name);

1174

}

1175

return 0;

1176

}

1177

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

1178

if(flags & IFF_NOARP){

1179

if(debug){

1180

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

1181

if_entry->d_name);

1182

}

1183

return 0;

1184

}

1185

/* Accept this device */

1186

if(debug){

1187

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

1188

if_entry->d_name);

1189

}

1190

return 1;

1191

}

1192

1193

int notdotentries(const struct dirent *direntry){

1194

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

1195

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

1196

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

1197

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

1198

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

1199

return 0;

1200

}

1201

return 1;

1202

}

1203

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

int ret;

1206

struct timespec now;

1207

struct timespec waited_time;

1208

intmax_t block_time;

1209

1210

while(true){

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

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

1215

}

1216

ret = avahi_simple_poll_iterate(s, -1);

1217

} else {

1218

if (debug){

1219

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

1220

" or wait\n");

1221

}

1222

/* the current time */

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1224

if(ret == -1){

1225

perror_plus("clock_gettime");

1226

return -1;

1227

}

1228

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

1229

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

1230

waited_time.tv_sec = (now.tv_sec

1231

- mc.current_server->last_seen.tv_sec);

1232

waited_time.tv_nsec = (now.tv_nsec

1233

- mc.current_server->last_seen.tv_nsec);

1234

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

1235

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

1236

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

1237

block_time = ((retry_interval

1238

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

1239

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

1240

1241

if (debug){

1242

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

1243

}

1244

1245

if(block_time <= 0){

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1250

if(ret == 0){

1251

avahi_simple_poll_quit(mc.simple_poll);

1252

return 0;

1253

}

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1255

&mc.current_server->last_seen);

1256

if(ret == -1){

1257

perror_plus("clock_gettime");

1258

return -1;

1259

}

1260

mc.current_server = mc.current_server->next;

1261

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

1262

servers, but don't block */

1263

}

1264

1265

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

1266

}

1267

if(ret != 0){

1268

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

1269

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

1270

}

1271

}

1272

}

1273

}

1274

893

1275

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

894

1276

AvahiSServiceBrowser *sb = NULL;

895

1277

int error;

897

1279

intmax_t tmpmax;

898

1280

char *tmp;

899

1281

int exitcode = EXIT_SUCCESS;

900

const char *interface = "eth0";

1282

const char *interface = "";

901

1283

struct ifreq network;

902

1284

int sd = -1;

903

bool interface_taken_up = false;

1285

bool take_down_interface = false;

904

1286

uid_t uid;

905

1287

gid_t gid;

906

char *connect_to = NULL;

907

1288

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

908

1289

bool tempdir_created = false;

909

1290

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

913

1294

bool gnutls_initialized = false;

914

1295

bool gpgme_initialized = false;

915

1296

float delay = 2.5f;

1297

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

1298

retrying the same server again */

916

1299

917

struct sigaction old_sigterm_action;

1300

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

1301

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

919

1302

1303

uid = getuid();

1304

gid = getgid();

1305

1306

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

1307

errno = 0;

1308

ret = setgid(gid);

1309

if(ret == -1){

1310

perror_plus("setgid");

1311

}

1312

1313

/* Lower user privileges (temporarily) */

1314

errno = 0;

1315

ret = seteuid(uid);

1316

if(ret == -1){

1317

perror_plus("seteuid");

1318

}

1319

1320

if(quit_now){

1321

goto end;

1322

}

1323

920

1324

{

921

1325

struct argp_option options[] = {

922

1326

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

951

1355

.arg = "SECONDS",

952

1356

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

953

1357

.group = 2 },

1358

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

1359

.arg = "SECONDS",

1360

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

1361

.group = 2 },

1362

/*

1363

* These reproduce what we would get without ARGP_NO_HELP

1364

*/

1365

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

1366

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

1367

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

1368

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

1369

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

1370

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

954

1371

{ .name = NULL }

955

1372

};

956

1373

957

1374

error_t parse_opt(int key, char *arg,

958

1375

struct argp_state *state){

1376

errno = 0;

959

1377

switch(key){

960

1378

case 128: /* --debug */

961

1379

debug = true;

977

1395

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

978

1396

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

979

1397

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

980

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

981

exit(EXIT_FAILURE);

1398

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

982

1399

}

983

1400

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

984

1401

break;

989

1406

errno = 0;

990

1407

delay = strtof(arg, &tmp);

991

1408

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

992

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

993

exit(EXIT_FAILURE);

1409

argp_error(state, "Bad delay");

1410

}

1411

case 132: /* --retry */

1412

errno = 0;

1413

retry_interval = strtod(arg, &tmp);

1414

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

1415

or (retry_interval * 1000) > INT_MAX

1416

or retry_interval < 0){

1417

argp_error(state, "Bad retry interval");

994

1418

}

995

1419

break;

996

case ARGP_KEY_ARG:

997

argp_usage(state);

998

case ARGP_KEY_END:

1420

/*

1421

* These reproduce what we would get without ARGP_NO_HELP

1422

*/

1423

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

1424

argp_state_help(state, state->out_stream,

1425

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1426

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1427

case -3: /* --usage */

1428

argp_state_help(state, state->out_stream,

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

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

1431

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

1432

exit(argp_err_exit_status);

999

1433

break;

1000

1434

default:

1001

1435

return ARGP_ERR_UNKNOWN;

1002

1436

}

1003

return 0;

1437

return errno;

1004

1438

}

1005

1439

1006

1440

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

1007

1441

.args_doc = "",

1008

1442

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

1009

1443

" passwords from a Mandos server" };

1010

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

1011

if(ret == ARGP_ERR_UNKNOWN){

1012

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

1013

exitcode = EXIT_FAILURE;

1014

goto end;

1444

ret = argp_parse(&argp, argc, argv,

1445

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1446

switch(ret){

1447

case 0:

1448

break;

1449

case ENOMEM:

1450

default:

1451

errno = ret;

1452

perror_plus("argp_parse");

1453

exitcode = EX_OSERR;

1454

goto end;

1455

case EINVAL:

1456

exitcode = EX_USAGE;

1457

goto end;

1458

}

1459

}

1460

1461

{

1462

/* Work around Debian bug #633582:

1463

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

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1015

1518

}

1016

1519

}

1017

1520

1018

1521

if(not debug){

1019

1522

avahi_set_log_function(empty_log);

1020

1523

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

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

1532

if(debug){

1533

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

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

1021

1549

1022

1550

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

1023

1551

from the signal handler */

1026

1554

mc.simple_poll = avahi_simple_poll_new();

1027

1555

if(mc.simple_poll == NULL){

1028

1556

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

1029

exitcode = EXIT_FAILURE;

1557

exitcode = EX_UNAVAILABLE;

1030

1558

goto end;

1031

1559

}

1032

1560

1033

1561

sigemptyset(&sigterm_action.sa_mask);

1034

1562

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

1035

1563

if(ret == -1){

1036

perror("sigaddset");

1037

exitcode = EXIT_FAILURE;

1564

perror_plus("sigaddset");

1565

exitcode = EX_OSERR;

1038

1566

goto end;

1039

1567

}

1040

1568

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

1041

1569

if(ret == -1){

1042

perror("sigaddset");

1043

exitcode = EXIT_FAILURE;

1570

perror_plus("sigaddset");

1571

exitcode = EX_OSERR;

1044

1572

goto end;

1045

1573

}

1046

1574

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

1047

1575

if(ret == -1){

1048

perror("sigaddset");

1049

exitcode = EXIT_FAILURE;

1050

goto end;

1051

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1576

perror_plus("sigaddset");

1577

exitcode = EX_OSERR;

1578

goto end;

1579

}

1580

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

1581

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

1582

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

1583

*/

1584

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

1585

if(ret == -1){

1586

perror_plus("sigaction");

1587

return EX_OSERR;

1588

}

1589

if(old_sigterm_action.sa_handler != SIG_IGN){

1590

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

1591

if(ret == -1){

1592

perror_plus("sigaction");

1593

exitcode = EX_OSERR;

1594

goto end;

1595

}

1596

}

1597

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

1598

if(ret == -1){

1599

perror_plus("sigaction");

1600

return EX_OSERR;

1601

}

1602

if(old_sigterm_action.sa_handler != SIG_IGN){

1603

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

1604

if(ret == -1){

1605

perror_plus("sigaction");

1606

exitcode = EX_OSERR;

1607

goto end;

1608

}

1609

}

1610

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

1611

if(ret == -1){

1612

perror_plus("sigaction");

1613

return EX_OSERR;

1614

}

1615

if(old_sigterm_action.sa_handler != SIG_IGN){

1616

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

1617

if(ret == -1){

1618

perror_plus("sigaction");

1619

exitcode = EX_OSERR;

1620

goto end;

1621

}

1622

}

1058

1623

1059

1624

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

1060

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

1625

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

1626

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

if(if_index == 0){

1628

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

1629

exitcode = EX_UNAVAILABLE;

1630

goto end;

1631

}

1632

1633

if(quit_now){

1634

goto end;

1635

}

1636

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1061

1644

#ifdef __linux__

1062

1645

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1063

messages to mess up the prompt */

1646

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

1064

1647

ret = klogctl(8, NULL, 5);

1065

1648

bool restore_loglevel = true;

1066

1649

if(ret == -1){

1067

1650

restore_loglevel = false;

1068

perror("klogctl");

1651

perror_plus("klogctl");

1069

1652

}

1070

1653

#endif /* __linux__ */

1071

1654

1072

1655

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1073

1656

if(sd < 0){

1074

perror("socket");

1075

exitcode = EXIT_FAILURE;

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1076

1659

#ifdef __linux__

1077

1660

if(restore_loglevel){

1078

1661

ret = klogctl(7, NULL, 0);

1079

1662

if(ret == -1){

1080

perror("klogctl");

1663

perror_plus("klogctl");

1081

1664

}

1082

1665

}

1083

1666

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1084

1673

goto end;

1085

1674

}

1086

1675

strcpy(network.ifr_name, interface);

1087

1676

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

1088

1677

if(ret == -1){

1089

perror("ioctl SIOCGIFFLAGS");

1678

perror_plus("ioctl SIOCGIFFLAGS");

1090

1679

#ifdef __linux__

1091

1680

if(restore_loglevel){

1092

1681

ret = klogctl(7, NULL, 0);

1093

1682

if(ret == -1){

1094

perror("klogctl");

1683

perror_plus("klogctl");

1095

1684

}

1096

1685

}

1097

1686

#endif /* __linux__ */

1098

exitcode = EXIT_FAILURE;

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1099

1694

goto end;

1100

1695

}

1101

1696

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

1102

1697

network.ifr_flags |= IFF_UP;

1698

take_down_interface = true;

1103

1699

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

1104

1700

if(ret == -1){

1105

perror("ioctl SIOCSIFFLAGS");

1106

exitcode = EXIT_FAILURE;

1701

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1107

1704

#ifdef __linux__

1108

1705

if(restore_loglevel){

1109

1706

ret = klogctl(7, NULL, 0);

1110

1707

if(ret == -1){

1111

perror("klogctl");

1708

perror_plus("klogctl");

1112

1709

}

1113

1710

}

1114

1711

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1115

1718

goto end;

1116

1719

}

1117

interface_taken_up = true;

1118

1720

}

1119

/* sleep checking until interface is running */

1721

/* Sleep checking until interface is running.

1722

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

1120

1723

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

1121

1724

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

1122

1725

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1726

perror_plus("ioctl SIOCGIFFLAGS");

1124

1727

} else if(network.ifr_flags & IFF_RUNNING){

1125

1728

break;

1126

1729

}

1127

1730

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1731

ret = nanosleep(&sleeptime, NULL);

1129

1732

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

1130

perror("nanosleep");

1733

perror_plus("nanosleep");

1131

1734

}

1132

1735

}

1133

if(not interface_taken_up){

1736

if(not take_down_interface){

1737

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

1134

1738

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

1135

1739

if(ret == -1){

1136

perror("close");

1740

perror_plus("close");

1137

1741

}

1138

1742

}

1139

1743

#ifdef __linux__

1141

1745

/* Restores kernel loglevel to default */

1142

1746

ret = klogctl(7, NULL, 0);

1143

1747

if(ret == -1){

1144

perror("klogctl");

1748

perror_plus("klogctl");

1145

1749

}

1146

1750

}

1147

1751

#endif /* __linux__ */

1148

}

1149

1150

uid = getuid();

1151

gid = getgid();

1152

1153

errno = 0;

1154

setgid(gid);

1155

if(ret == -1){

1156

perror("setgid");

1157

}

1158

1159

ret = setuid(uid);

1160

if(ret == -1){

1161

perror("setuid");

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

1760

} else {

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

1766

}

1767

}

1768

1769

if(quit_now){

1770

goto end;

1162

1771

}

1163

1772

1164

1773

ret = init_gnutls_global(pubkey, seckey);

1165

1774

if(ret == -1){

1166

1775

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

1167

exitcode = EXIT_FAILURE;

1776

exitcode = EX_UNAVAILABLE;

1168

1777

goto end;

1169

1778

} else {

1170

1779

gnutls_initialized = true;

1171

1780

}

1172

1781

1782

if(quit_now){

1783

goto end;

1784

}

1785

1173

1786

if(mkdtemp(tempdir) == NULL){

1174

perror("mkdtemp");

1787

perror_plus("mkdtemp");

1175

1788

goto end;

1176

1789

}

1177

1790

tempdir_created = true;

1178

1791

1792

if(quit_now){

1793

goto end;

1794

}

1795

1179

1796

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

1180

1797

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

1181

exitcode = EXIT_FAILURE;

1798

exitcode = EX_UNAVAILABLE;

1182

1799

goto end;

1183

1800

} else {

1184

1801

gpgme_initialized = true;

1185

1802

}

1186

1803

1187

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

1188

if_index = (AvahiIfIndex) if_nametoindex(interface);

1189

if(if_index == 0){

1190

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

1191

exitcode = EXIT_FAILURE;

1192

goto end;

1193

}

1804

if(quit_now){

1805

goto end;

1194

1806

}

1195

1807

1196

1808

if(connect_to != NULL){

1199

1811

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

1200

1812

if(address == NULL){

1201

1813

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

1202

exitcode = EXIT_FAILURE;

1203

goto end;

1204

}

1814

exitcode = EX_USAGE;

1815

goto end;

1816

}

1817

1818

if(quit_now){

1819

goto end;

1820

}

1821

1205

1822

uint16_t port;

1206

1823

errno = 0;

1207

1824

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

1208

1825

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

1209

1826

or tmpmax != (uint16_t)tmpmax){

1210

1827

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

1211

exitcode = EXIT_FAILURE;

1212

goto end;

1213

}

1828

exitcode = EX_USAGE;

1829

goto end;

1830

}

1831

1832

if(quit_now){

1833

goto end;

1834

}

1835

1214

1836

port = (uint16_t)tmpmax;

1215

1837

*address = '\0';

1216

address = connect_to;

1217

1838

/* Colon in address indicates IPv6 */

1218

1839

int af;

1219

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

1840

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

1220

1841

af = AF_INET6;

1842

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

1843

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

1844

{

1845

connect_to++;

1846

address[-1] = '\0';

1847

}

1221

1848

} else {

1222

1849

af = AF_INET;

1223

1850

}

1224

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

1225

if(ret < 0){

1226

exitcode = EXIT_FAILURE;

1227

} else {

1851

address = connect_to;

1852

1853

if(quit_now){

1854

goto end;

1855

}

1856

1857

while(not quit_now){

1858

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

1859

if(quit_now or ret == 0){

1860

break;

1861

}

1862

if(debug){

1863

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

1864

(int)retry_interval);

1865

}

1866

sleep((int)retry_interval);

1867

}

1868

1869

if (not quit_now){

1228

1870

exitcode = EXIT_SUCCESS;

1229

1871

}

1230

goto end;

1231

}

1232

1872

1873

goto end;

1874

}

1875

1876

if(quit_now){

1877

goto end;

1878

}

1879

1233

1880

{

1234

1881

AvahiServerConfig config;

1235

1882

/* Do not publish any local Zeroconf records */

1252

1899

if(mc.server == NULL){

1253

1900

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

1254

1901

avahi_strerror(error));

1255

exitcode = EXIT_FAILURE;

1902

exitcode = EX_UNAVAILABLE;

1903

goto end;

1904

}

1905

1906

if(quit_now){

1256

1907

goto end;

1257

1908

}

1258

1909

1263

1914

if(sb == NULL){

1264

1915

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

1265

1916

avahi_strerror(avahi_server_errno(mc.server)));

1266

exitcode = EXIT_FAILURE;

1917

exitcode = EX_UNAVAILABLE;

1918

goto end;

1919

}

1920

1921

if(quit_now){

1267

1922

goto end;

1268

1923

}

1269

1924

1272

1927

if(debug){

1273

1928

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

1274

1929

}

1275

1276

avahi_simple_poll_loop(mc.simple_poll);

1930

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

1933

if(debug){

1934

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

1935

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

1936

}

1277

1937

1278

1938

end:

1279

1939

1300

1960

if(gpgme_initialized){

1301

1961

gpgme_release(mc.ctx);

1302

1962

}

1963

1964

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

1965

has seen */

1966

if(mc.current_server != NULL){

1967

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

1968

while(mc.current_server != NULL){

1969

server *next = mc.current_server->next;

1970

free(mc.current_server);

1971

mc.current_server = next;

1972

}

1973

}

1303

1974

1304

1975

/* Take down the network interface */

1305

if(interface_taken_up){

1306

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

1976

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1307

1980

if(ret == -1){

1308

perror("ioctl SIOCGIFFLAGS");

1309

} else if(network.ifr_flags & IFF_UP) {

1310

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

1311

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

1312

if(ret == -1){

1313

perror("ioctl SIOCSIFFLAGS");

1314

}

1981

perror_plus("seteuid");

1315

1982

}

1316

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

1317

if(ret == -1){

1318

perror("close");

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1992

}

1993

}

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

1319

2004

}

1320

2005

}

1321

2006

1322

/* Removes the temp directory used by GPGME */

2007

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

1323

2008

if(tempdir_created){

1324

DIR *d;

1325

struct dirent *direntry;

1326

d = opendir(tempdir);

1327

if(d == NULL){

1328

if(errno != ENOENT){

1329

perror("opendir");

1330

}

1331

} else {

1332

while(true){

1333

direntry = readdir(d);

1334

if(direntry == NULL){

1335

break;

1336

}

1337

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

1338

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

1339

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

1340

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

1341

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

1342

continue;

1343

}

2009

struct dirent **direntries = NULL;

2010

struct dirent *direntry = NULL;

2011

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

2012

alphasort);

2013

if (numentries > 0){

2014

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

2015

direntry = direntries[i];

1344

2016

char *fullname = NULL;

1345

2017

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

1346

2018

direntry->d_name);

1347

2019

if(ret < 0){

1348

perror("asprintf");

2020

perror_plus("asprintf");

1349

2021

continue;

1350

2022

}

1351

2023

ret = remove(fullname);

1355

2027

}

1356

2028

free(fullname);

1357

2029

}

1358

closedir(d);

2030

}

2031

2032

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

2033

free(direntries);

2034

if (numentries == -1){

2035

perror_plus("scandir");

1359

2036

}

1360

2037

ret = rmdir(tempdir);

1361

2038

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

1362

perror("rmdir");

1363

}

2039

perror_plus("rmdir");

2040

}

2041

}

2042

2043

if(quit_now){

2044

sigemptyset(&old_sigterm_action.sa_mask);

2045

old_sigterm_action.sa_handler = SIG_DFL;

2046

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2047

&old_sigterm_action,

2048

NULL));

2049

if(ret == -1){

2050

perror_plus("sigaction");

2051

}

2052

do {

2053

ret = raise(signal_received);

2054

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

2055

if(ret != 0){

2056

perror_plus("raise");

2057

abort();

2058

}

2059

TEMP_FAILURE_RETRY(pause());

1364

2060

}

1365

2061

1366

2062

return exitcode;