/mandos/trunk : revision 24.1.174

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

30

*/

31

32

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

33

#ifndef _LARGEFILE_SOURCE

33

34

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

34

37

#define _FILE_OFFSET_BITS 64

38

#endif

35

39

36

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

37

41

38

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

39

stdout, ferror(), sscanf(),

40

remove() */

43

stdout, ferror(), remove() */

41

44

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

42

45

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

43

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

44

srand() */

46

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

47

strtof(), abort() */

45

48

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

46

49

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

47

50

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

56

59

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

57

60

#include <dirent.h> /* opendir(), struct dirent, readdir()

58

61

*/

59

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

62

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

63

strtoimax() */

60

64

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

61

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

62

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

65

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

66

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

63

67

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

64

68

SIOCSIFFLAGS, if_indextoname(),

65

69

if_nametoindex(), IF_NAMESIZE */

67

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

68

72

*/

69

73

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

70

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

71

setgid() */

74

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

75

setgid(), pause() */

72

76

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

73

77

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

74

78

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

76

80

argp_parse(), ARGP_KEY_ARG,

77

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

78

82

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

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

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

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

81

87

82

88

#ifdef __linux__

83

89

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

121

127

static const char mandos_protocol_version[] = "1";

122

128

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

123

129

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

130

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

131

char *connect_to = NULL;

132

133

/* Doubly linked list that need to be circular linked when ever used */

134

typedef struct server{

135

const char *ip;

136

uint16_t port;

137

AvahiIfIndex if_index;

138

int af;

139

struct timespec last_seen;

140

struct server *next;

141

struct server *prev;

142

} server;

124

143

125

144

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

126

145

typedef struct {

131

150

gnutls_dh_params_t dh_params;

132

151

const char *priority;

133

152

gpgme_ctx_t ctx;

153

server *current_server;

134

154

} mandos_context;

135

155

136

156

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

137

157

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

138

158

.dh_bits = 1024, .priority = "SECURE256"

139

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

159

":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };

160

161

sig_atomic_t quit_now = 0;

162

int signal_received = 0;

163

164

/* Function to use when printing errors */

165

void perror_plus(const char *print_text){

166

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

167

perror(print_text);

168

}

140

169

141

170

/*

142

171

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

155

184

return buffer_capacity;

156

185

}

157

186

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

190

int ret;

191

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

192

if(new_server == NULL){

193

perror_plus("malloc");

194

return -1;

195

}

196

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

197

.port = port,

198

.if_index = if_index,

199

.af = af };

200

if(new_server->ip == NULL){

201

perror_plus("strdup");

202

return -1;

203

}

204

/* uniqe case of first server */

205

if (mc.current_server == NULL){

206

new_server->next = new_server;

207

new_server->prev = new_server;

208

mc.current_server = new_server;

209

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

210

} else {

211

new_server->next = mc.current_server;

212

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

213

new_server->prev->next = new_server;

214

mc.current_server->prev = new_server;

215

}

216

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

217

if(ret == -1){

218

perror_plus("clock_gettime");

219

return -1;

220

}

221

return 0;

222

}

223

158

224

/*

159

225

* Initialize GPGME.

160

226

*/

161

227

static bool init_gpgme(const char *seckey,

162

228

const char *pubkey, const char *tempdir){

163

int ret;

164

229

gpgme_error_t rc;

165

230

gpgme_engine_info_t engine_info;

166

231

169

234

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

170

235

*/

171

236

bool import_key(const char *filename){

237

int ret;

172

238

int fd;

173

239

gpgme_data_t pgp_data;

174

240

175

241

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

176

242

if(fd == -1){

177

perror("open");

243

perror_plus("open");

178

244

return false;

179

245

}

180

246

194

260

195

261

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

196

262

if(ret == -1){

197

perror("close");

263

perror_plus("close");

198

264

}

199

265

gpgme_data_release(pgp_data);

200

266

return true;

245

311

return false;

246

312

}

247

313

248

return true;

314

return true;

249

315

}

250

316

251

317

/*

305

371

}

306

372

gpgme_recipient_t recipient;

307

373

recipient = result->recipients;

308

if(recipient){

309

while(recipient != NULL){

310

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

311

gpgme_pubkey_algo_name(recipient->pubkey_algo));

312

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

313

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

314

recipient->status == GPG_ERR_NO_SECKEY

315

? "No" : "Yes");

316

recipient = recipient->next;

317

}

374

while(recipient != NULL){

375

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

376

gpgme_pubkey_algo_name(recipient->pubkey_algo));

377

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

378

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

379

recipient->status == GPG_ERR_NO_SECKEY

380

? "No" : "Yes");

381

recipient = recipient->next;

318

382

}

319

383

}

320

384

}

327

391

328

392

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

329

393

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

330

perror("gpgme_data_seek");

394

perror_plus("gpgme_data_seek");

331

395

plaintext_length = -1;

332

396

goto decrypt_end;

333

397

}

338

402

(size_t)plaintext_length,

339

403

plaintext_capacity);

340

404

if(plaintext_capacity == 0){

341

perror("incbuffer");

405

perror_plus("incbuffer");

342

406

plaintext_length = -1;

343

407

goto decrypt_end;

344

408

}

351

415

break;

352

416

}

353

417

if(ret < 0){

354

perror("gpgme_data_read");

418

perror_plus("gpgme_data_read");

355

419

plaintext_length = -1;

356

420

goto decrypt_end;

357

421

}

472

536

static int init_gnutls_session(gnutls_session_t *session){

473

537

int ret;

474

538

/* GnuTLS session creation */

475

ret = gnutls_init(session, GNUTLS_SERVER);

539

do {

540

ret = gnutls_init(session, GNUTLS_SERVER);

541

if(quit_now){

542

return -1;

543

}

544

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

476

545

if(ret != GNUTLS_E_SUCCESS){

477

546

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

478

547

safer_gnutls_strerror(ret));

480

549

481

550

{

482

551

const char *err;

483

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

552

do {

553

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

554

if(quit_now){

555

gnutls_deinit(*session);

556

return -1;

557

}

558

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

484

559

if(ret != GNUTLS_E_SUCCESS){

485

560

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

486

561

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

490

565

}

491

566

}

492

567

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

568

do {

569

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

570

mc.cred);

571

if(quit_now){

572

gnutls_deinit(*session);

573

return -1;

574

}

575

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

495

576

if(ret != GNUTLS_E_SUCCESS){

496

577

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

497

578

safer_gnutls_strerror(ret));

500

581

}

501

582

502

583

/* ignore client certificate if any. */

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

584

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

585

506

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

507

587

516

596

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

517

597

AvahiIfIndex if_index,

518

598

int af){

519

int ret, tcp_sd;

599

int ret, tcp_sd = -1;

520

600

ssize_t sret;

521

601

union {

522

602

struct sockaddr_in in;

523

603

struct sockaddr_in6 in6;

524

604

} to;

525

605

char *buffer = NULL;

526

char *decrypted_buffer;

606

char *decrypted_buffer = NULL;

527

607

size_t buffer_length = 0;

528

608

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

530

609

size_t written;

531

int retval = 0;

610

int retval = -1;

532

611

gnutls_session_t session;

533

612

int pf; /* Protocol family */

534

613

614

errno = 0;

615

616

if(quit_now){

617

errno = EINTR;

618

return -1;

619

}

620

535

621

switch(af){

536

622

case AF_INET6:

537

623

pf = PF_INET6;

541

627

break;

542

628

default:

543

629

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

630

errno = EINVAL;

544

631

return -1;

545

632

}

546

633

556

643

557

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

558

645

if(tcp_sd < 0){

559

perror("socket");

560

return -1;

646

int e = errno;

647

perror_plus("socket");

648

errno = e;

649

goto mandos_end;

650

}

651

652

if(quit_now){

653

errno = EINTR;

654

goto mandos_end;

561

655

}

562

656

563

657

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

564

658

if(af == AF_INET6){

565

to.in6.sin6_family = (uint16_t)af;

659

to.in6.sin6_family = (sa_family_t)af;

566

660

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

567

661

} else { /* IPv4 */

568

662

to.in.sin_family = (sa_family_t)af;

569

663

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

570

664

}

571

665

if(ret < 0 ){

572

perror("inet_pton");

573

return -1;

666

int e = errno;

667

perror_plus("inet_pton");

668

errno = e;

669

goto mandos_end;

574

670

}

575

671

if(ret == 0){

672

int e = errno;

576

673

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

577

return -1;

674

errno = e;

675

goto mandos_end;

578

676

}

579

677

if(af == AF_INET6){

580

678

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

587

685

if(if_index == AVAHI_IF_UNSPEC){

588

686

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

589

687

" without a network interface\n");

590

return -1;

688

errno = EINVAL;

689

goto mandos_end;

591

690

}

592

691

/* Set the network interface number as scope */

593

692

to.in6.sin6_scope_id = (uint32_t)if_index;

598

697

-Wunreachable-code */

599

698

}

600

699

700

if(quit_now){

701

errno = EINTR;

702

goto mandos_end;

703

}

704

601

705

if(debug){

602

706

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

603

707

char interface[IF_NAMESIZE];

604

708

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

605

perror("if_indextoname");

709

perror_plus("if_indextoname");

606

710

} else {

607

711

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

608

712

ip, interface, port);

622

726

sizeof(addrstr));

623

727

}

624

728

if(pcret == NULL){

625

perror("inet_ntop");

729

perror_plus("inet_ntop");

626

730

} else {

627

731

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

628

732

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

630

734

}

631

735

}

632

736

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

633

742

if(af == AF_INET6){

634

743

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

635

744

} else {

636

745

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

637

746

}

638

747

if(ret < 0){

639

perror("connect");

640

return -1;

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

753

goto mandos_end;

754

}

755

756

if(quit_now){

757

errno = EINTR;

758

goto mandos_end;

641

759

}

642

760

643

761

const char *out = mandos_protocol_version;

647

765

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

648

766

out_size - written));

649

767

if(ret == -1){

650

perror("write");

651

retval = -1;

768

int e = errno;

769

perror_plus("write");

770

errno = e;

652

771

goto mandos_end;

653

772

}

654

773

written += (size_t)ret;

662

781

break;

663

782

}

664

783

}

784

785

if(quit_now){

786

errno = EINTR;

787

goto mandos_end;

788

}

665

789

}

666

790

667

791

if(debug){

668

792

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

669

793

}

670

794

795

if(quit_now){

796

errno = EINTR;

797

goto mandos_end;

798

}

799

800

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

671

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

672

802

673

do{

803

if(quit_now){

804

errno = EINTR;

805

goto mandos_end;

806

}

807

808

do {

674

809

ret = gnutls_handshake(session);

810

if(quit_now){

811

errno = EINTR;

812

goto mandos_end;

813

}

675

814

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

676

815

677

816

if(ret != GNUTLS_E_SUCCESS){

679

818

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

680

819

gnutls_perror(ret);

681

820

}

682

retval = -1;

821

errno = EPROTO;

683

822

goto mandos_end;

684

823

}

685

824

691

830

}

692

831

693

832

while(true){

833

834

if(quit_now){

835

errno = EINTR;

836

goto mandos_end;

837

}

838

694

839

buffer_capacity = incbuffer(&buffer, buffer_length,

695

840

buffer_capacity);

696

841

if(buffer_capacity == 0){

697

perror("incbuffer");

698

retval = -1;

842

int e = errno;

843

perror_plus("incbuffer");

844

errno = e;

845

goto mandos_end;

846

}

847

848

if(quit_now){

849

errno = EINTR;

699

850

goto mandos_end;

700

851

}

701

852

710

861

case GNUTLS_E_AGAIN:

711

862

break;

712

863

case GNUTLS_E_REHANDSHAKE:

713

do{

864

do {

714

865

ret = gnutls_handshake(session);

866

867

if(quit_now){

868

errno = EINTR;

869

goto mandos_end;

870

}

715

871

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

716

872

if(ret < 0){

717

873

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

718

874

gnutls_perror(ret);

719

retval = -1;

875

errno = EPROTO;

720

876

goto mandos_end;

721

877

}

722

878

break;

723

879

default:

724

880

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

725

881

" encrypted session with Mandos server\n");

726

retval = -1;

727

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

errno = EIO;

728

884

goto mandos_end;

729

885

}

730

886

} else {

736

892

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

737

893

}

738

894

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

895

if(quit_now){

896

errno = EINTR;

897

goto mandos_end;

898

}

899

900

do {

901

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

902

if(quit_now){

903

errno = EINTR;

904

goto mandos_end;

905

}

906

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

740

907

741

908

if(buffer_length > 0){

909

ssize_t decrypted_buffer_size;

742

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

743

911

buffer_length,

744

912

&decrypted_buffer);

745

913

if(decrypted_buffer_size >= 0){

914

746

915

written = 0;

747

916

while(written < (size_t) decrypted_buffer_size){

917

if(quit_now){

918

errno = EINTR;

919

goto mandos_end;

920

}

921

748

922

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

749

923

(size_t)decrypted_buffer_size - written,

750

924

stdout);

751

925

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

926

int e = errno;

752

927

if(debug){

753

928

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

754

929

strerror(errno));

755

930

}

756

retval = -1;

757

break;

931

errno = e;

932

goto mandos_end;

758

933

}

759

934

written += (size_t)ret;

760

935

}

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

936

retval = 0;

764

937

}

765

} else {

766

retval = -1;

767

938

}

768

939

769

940

/* Shutdown procedure */

770

941

771

942

mandos_end:

772

free(buffer);

773

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

774

if(ret == -1){

775

perror("close");

943

{

944

int e = errno;

945

free(decrypted_buffer);

946

free(buffer);

947

if(tcp_sd >= 0){

948

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

949

}

950

if(ret == -1){

951

if(e == 0){

952

e = errno;

953

}

954

perror_plus("close");

955

}

956

gnutls_deinit(session);

957

errno = e;

958

if(quit_now){

959

errno = EINTR;

960

retval = -1;

961

}

776

962

}

777

gnutls_deinit(session);

778

963

return retval;

779

964

}

780

965

797

982

/* Called whenever a service has been resolved successfully or

798

983

timed out */

799

984

985

if(quit_now){

986

return;

987

}

988

800

989

switch(event){

801

990

default:

802

991

case AVAHI_RESOLVER_FAILURE:

818

1007

avahi_proto_to_af(proto));

819

1008

if(ret == 0){

820

1009

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

821

1013

}

822

1014

}

823

1015

}

839

1031

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

840

1032

is removed from the LAN */

841

1033

1034

if(quit_now){

1035

return;

1036

}

1037

842

1038

switch(event){

843

1039

default:

844

1040

case AVAHI_BROWSER_FAILURE:

854

1050

the callback function is called the Avahi server will free the

855

1051

resolver for us. */

856

1052

857

if(!(avahi_s_service_resolver_new(mc.server, interface,

858

protocol, name, type, domain,

859

AVAHI_PROTO_INET6, 0,

860

resolve_callback, NULL)))

1053

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

861

1056

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

862

1057

name, avahi_strerror(avahi_server_errno(mc.server)));

863

1058

break;

874

1069

}

875

1070

}

876

1071

877

sig_atomic_t quit_now = 0;

878

879

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

880

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

1072

/* Signal handler that stops main loop after sigterm has been called */

1073

static void handle_sigterm(int sig){

881

1074

if(quit_now){

882

1075

return;

883

1076

}

884

1077

quit_now = 1;

1078

signal_received = sig;

885

1079

int old_errno = errno;

1080

/* set main loop to exit */

886

1081

if(mc.simple_poll != NULL){

887

1082

avahi_simple_poll_quit(mc.simple_poll);

888

1083

}

889

1084

errno = old_errno;

890

1085

}

891

1086

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1143

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1146

}

1147

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

if_entry->d_name);

1165

}

1166

return 1;

1167

}

1168

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

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

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

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

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

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

/* Accept this device */

1185

if(debug){

1186

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

1187

if_entry->d_name);

1188

}

1189

return 1;

1190

}

1191

1192

int notdotentries(const struct dirent *direntry){

1193

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

1194

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

1195

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

1196

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

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

int ret;

1205

struct timespec now;

1206

struct timespec waited_time;

1207

intmax_t block_time;

1208

1209

while(true){

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr, "Wait until first server is found. No timeout!\n");

1213

}

1214

ret = avahi_simple_poll_iterate(s, -1);

1215

} else {

1216

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1218

}

1219

/* the current time */

1220

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1221

if(ret == -1){

1222

perror_plus("clock_gettime");

1223

return -1;

1224

}

1225

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

1226

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

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1232

if (debug){

1233

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

1234

}

1235

1236

if(block_time <= 0){

1237

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1241

if(ret == 0){

1242

avahi_simple_poll_quit(mc.simple_poll);

1243

return 0;

1244

}

1245

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

1246

if(ret == -1){

1247

perror_plus("clock_gettime");

1248

return -1;

1249

}

1250

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1252

}

1253

1254

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

1255

}

1256

if(ret != 0){

1257

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

1258

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

1259

}

1260

}

1261

}

1262

}

1263

892

1264

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

893

1265

AvahiSServiceBrowser *sb = NULL;

894

1266

int error;

895

1267

int ret;

896

1268

intmax_t tmpmax;

897

int numchars;

1269

char *tmp;

898

1270

int exitcode = EXIT_SUCCESS;

899

const char *interface = "eth0";

1271

const char *interface = "";

900

1272

struct ifreq network;

901

int sd;

1273

int sd = -1;

1274

bool take_down_interface = false;

902

1275

uid_t uid;

903

1276

gid_t gid;

904

char *connect_to = NULL;

905

1277

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

906

1278

bool tempdir_created = false;

907

1279

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

908

1280

const char *seckey = PATHDIR "/" SECKEY;

909

1281

const char *pubkey = PATHDIR "/" PUBKEY;

910

1282

911

/* Initialize Mandos context */

912

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

913

.dh_bits = 1024, .priority = "SECURE256"

914

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

915

1283

bool gnutls_initialized = false;

916

1284

bool gpgme_initialized = false;

917

double delay = 2.5;

918

919

struct sigaction old_sigterm_action;

1285

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

1287

1288

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

920

1289

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

921

1290

1291

uid = getuid();

1292

gid = getgid();

1293

1294

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

1295

errno = 0;

1296

ret = setgid(gid);

1297

if(ret == -1){

1298

perror_plus("setgid");

1299

}

1300

1301

/* Lower user privileges (temporarily) */

1302

errno = 0;

1303

ret = seteuid(uid);

1304

if(ret == -1){

1305

perror_plus("seteuid");

1306

}

1307

1308

if(quit_now){

1309

goto end;

1310

}

1311

922

1312

{

923

1313

struct argp_option options[] = {

924

1314

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

953

1343

.arg = "SECONDS",

954

1344

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

955

1345

.group = 2 },

1346

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

1347

.arg = "SECONDS",

1348

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

1349

.group = 2 },

1350

/*

1351

* These reproduce what we would get without ARGP_NO_HELP

1352

*/

1353

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

1354

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

1355

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

1356

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

1357

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

1358

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

956

1359

{ .name = NULL }

957

1360

};

958

1361

959

1362

error_t parse_opt(int key, char *arg,

960

1363

struct argp_state *state){

1364

errno = 0;

961

1365

switch(key){

962

1366

case 128: /* --debug */

963

1367

debug = true;

975

1379

pubkey = arg;

976

1380

break;

977

1381

case 129: /* --dh-bits */

978

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

979

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

980

or arg[numchars] != '\0'){

981

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

982

exit(EXIT_FAILURE);

1382

errno = 0;

1383

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

1384

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

1385

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

1386

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

983

1387

}

984

1388

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

985

1389

break;

987

1391

mc.priority = arg;

988

1392

break;

989

1393

case 131: /* --delay */

990

ret = sscanf(arg, "%lf%n", &delay, &numchars);

991

if(ret < 1 or arg[numchars] != '\0'){

992

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

993

exit(EXIT_FAILURE);

1394

errno = 0;

1395

delay = strtof(arg, &tmp);

1396

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

1397

argp_error(state, "Bad delay");

1398

}

1399

case 132: /* --retry */

1400

errno = 0;

1401

retry_interval = strtod(arg, &tmp);

1402

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

1403

or (retry_interval * 1000) > INT_MAX){

1404

argp_error(state, "Bad retry interval");

994

1405

}

995

1406

break;

996

case ARGP_KEY_ARG:

997

argp_usage(state);

998

case ARGP_KEY_END:

1407

/*

1408

* These reproduce what we would get without ARGP_NO_HELP

1409

*/

1410

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

1411

argp_state_help(state, state->out_stream,

1412

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1413

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1414

case -3: /* --usage */

1415

argp_state_help(state, state->out_stream,

1416

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1417

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

1418

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

1419

exit(argp_err_exit_status);

999

1420

break;

1000

1421

default:

1001

1422

return ARGP_ERR_UNKNOWN;

1002

1423

}

1003

return 0;

1424

return errno;

1004

1425

}

1005

1426

1006

1427

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

1007

1428

.args_doc = "",

1008

1429

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

1009

1430

" 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;

1431

ret = argp_parse(&argp, argc, argv,

1432

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1433

switch(ret){

1434

case 0:

1435

break;

1436

case ENOMEM:

1437

default:

1438

errno = ret;

1439

perror_plus("argp_parse");

1440

exitcode = EX_OSERR;

1441

goto end;

1442

case EINVAL:

1443

exitcode = EX_USAGE;

1014

1444

goto end;

1015

1445

}

1016

1446

}

1018

1448

if(not debug){

1019

1449

avahi_set_log_function(empty_log);

1020

1450

}

1451

1452

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

1453

struct dirent **direntries;

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1455

alphasort);

1456

if(ret >= 1){

1457

/* Pick the first good interface */

1458

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

1459

if(debug){

1460

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

1461

}

1462

if(interface == NULL){

1463

perror_plus("malloc");

1464

free(direntries);

1465

exitcode = EXIT_FAILURE;

1466

goto end;

1467

}

1468

free(direntries);

1469

} else {

1470

free(direntries);

1471

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

1472

exitcode = EXIT_FAILURE;

1473

goto end;

1474

}

1475

}

1021

1476

1022

1477

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

1023

1478

from the signal handler */

1026

1481

mc.simple_poll = avahi_simple_poll_new();

1027

1482

if(mc.simple_poll == NULL){

1028

1483

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

1029

exitcode = EXIT_FAILURE;

1484

exitcode = EX_UNAVAILABLE;

1030

1485

goto end;

1031

1486

}

1032

1487

1033

1488

sigemptyset(&sigterm_action.sa_mask);

1034

1489

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

1035

1490

if(ret == -1){

1036

perror("sigaddset");

1037

exitcode = EXIT_FAILURE;

1491

perror_plus("sigaddset");

1492

exitcode = EX_OSERR;

1038

1493

goto end;

1039

1494

}

1040

1495

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

1041

1496

if(ret == -1){

1042

perror("sigaddset");

1043

exitcode = EXIT_FAILURE;

1497

perror_plus("sigaddset");

1498

exitcode = EX_OSERR;

1044

1499

goto end;

1045

1500

}

1046

1501

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

1047

1502

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

}

1503

perror_plus("sigaddset");

1504

exitcode = EX_OSERR;

1505

goto end;

1506

}

1507

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

1508

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

1509

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

1510

*/

1511

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

1512

if(ret == -1){

1513

perror_plus("sigaction");

1514

return EX_OSERR;

1515

}

1516

if(old_sigterm_action.sa_handler != SIG_IGN){

1517

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

1518

if(ret == -1){

1519

perror_plus("sigaction");

1520

exitcode = EX_OSERR;

1521

goto end;

1522

}

1523

}

1524

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

1525

if(ret == -1){

1526

perror_plus("sigaction");

1527

return EX_OSERR;

1528

}

1529

if(old_sigterm_action.sa_handler != SIG_IGN){

1530

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

1531

if(ret == -1){

1532

perror_plus("sigaction");

1533

exitcode = EX_OSERR;

1534

goto end;

1535

}

1536

}

1537

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

1538

if(ret == -1){

1539

perror_plus("sigaction");

1540

return EX_OSERR;

1541

}

1542

if(old_sigterm_action.sa_handler != SIG_IGN){

1543

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

1544

if(ret == -1){

1545

perror_plus("sigaction");

1546

exitcode = EX_OSERR;

1547

goto end;

1548

}

1549

}

1058

1550

1059

1551

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

1060

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

1552

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

1553

if_index = (AvahiIfIndex) if_nametoindex(interface);

1554

if(if_index == 0){

1555

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

1556

exitcode = EX_UNAVAILABLE;

1557

goto end;

1558

}

1559

1560

if(quit_now){

1561

goto end;

1562

}

1563

1564

/* Re-raise priviliges */

1565

errno = 0;

1566

ret = seteuid(0);

1567

if(ret == -1){

1568

perror_plus("seteuid");

1569

}

1570

1061

1571

#ifdef __linux__

1062

1572

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1063

messages to mess up the prompt */

1573

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

1064

1574

ret = klogctl(8, NULL, 5);

1065

1575

bool restore_loglevel = true;

1066

1576

if(ret == -1){

1067

1577

restore_loglevel = false;

1068

perror("klogctl");

1578

perror_plus("klogctl");

1069

1579

}

1070

1580

#endif /* __linux__ */

1071

1581

1072

1582

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1073

1583

if(sd < 0){

1074

perror("socket");

1075

exitcode = EXIT_FAILURE;

1584

perror_plus("socket");

1585

exitcode = EX_OSERR;

1076

1586

#ifdef __linux__

1077

1587

if(restore_loglevel){

1078

1588

ret = klogctl(7, NULL, 0);

1079

1589

if(ret == -1){

1080

perror("klogctl");

1590

perror_plus("klogctl");

1081

1591

}

1082

1592

}

1083

1593

#endif /* __linux__ */

1594

/* Lower privileges */

1595

errno = 0;

1596

ret = seteuid(uid);

1597

if(ret == -1){

1598

perror_plus("seteuid");

1599

}

1084

1600

goto end;

1085

1601

}

1086

1602

strcpy(network.ifr_name, interface);

1087

1603

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

1088

1604

if(ret == -1){

1089

perror("ioctl SIOCGIFFLAGS");

1605

perror_plus("ioctl SIOCGIFFLAGS");

1090

1606

#ifdef __linux__

1091

1607

if(restore_loglevel){

1092

1608

ret = klogctl(7, NULL, 0);

1093

1609

if(ret == -1){

1094

perror("klogctl");

1610

perror_plus("klogctl");

1095

1611

}

1096

1612

}

1097

1613

#endif /* __linux__ */

1098

exitcode = EXIT_FAILURE;

1614

exitcode = EX_OSERR;

1615

/* Lower privileges */

1616

errno = 0;

1617

ret = seteuid(uid);

1618

if(ret == -1){

1619

perror_plus("seteuid");

1620

}

1099

1621

goto end;

1100

1622

}

1101

1623

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

1102

1624

network.ifr_flags |= IFF_UP;

1625

take_down_interface = true;

1103

1626

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

1104

1627

if(ret == -1){

1105

perror("ioctl SIOCSIFFLAGS");

1106

exitcode = EXIT_FAILURE;

1628

take_down_interface = false;

1629

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1630

exitcode = EX_OSERR;

1107

1631

#ifdef __linux__

1108

1632

if(restore_loglevel){

1109

1633

ret = klogctl(7, NULL, 0);

1110

1634

if(ret == -1){

1111

perror("klogctl");

1635

perror_plus("klogctl");

1112

1636

}

1113

1637

}

1114

1638

#endif /* __linux__ */

1639

/* Lower privileges */

1640

errno = 0;

1641

ret = seteuid(uid);

1642

if(ret == -1){

1643

perror_plus("seteuid");

1644

}

1115

1645

goto end;

1116

1646

}

1117

1647

}

1118

/* sleep checking until interface is running */

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1119

1649

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

1120

1650

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

1121

1651

if(ret == -1){

1122

perror("ioctl SIOCGIFFLAGS");

1652

perror_plus("ioctl SIOCGIFFLAGS");

1123

1653

} else if(network.ifr_flags & IFF_RUNNING){

1124

1654

break;

1125

1655

}

1126

1656

struct timespec sleeptime = { .tv_nsec = 250000000 };

1127

1657

ret = nanosleep(&sleeptime, NULL);

1128

1658

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

1129

perror("nanosleep");

1659

perror_plus("nanosleep");

1130

1660

}

1131

1661

}

1132

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

1133

if(ret == -1){

1134

perror("close");

1662

if(not take_down_interface){

1663

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

1664

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

1665

if(ret == -1){

1666

perror_plus("close");

1667

}

1135

1668

}

1136

1669

#ifdef __linux__

1137

1670

if(restore_loglevel){

1138

1671

/* Restores kernel loglevel to default */

1139

1672

ret = klogctl(7, NULL, 0);

1140

1673

if(ret == -1){

1141

perror("klogctl");

1674

perror_plus("klogctl");

1142

1675

}

1143

1676

}

1144

1677

#endif /* __linux__ */

1145

}

1146

1147

uid = getuid();

1148

gid = getgid();

1149

1150

errno = 0;

1151

setgid(gid);

1152

if(ret == -1){

1153

perror("setgid");

1154

}

1155

1156

ret = setuid(uid);

1157

if(ret == -1){

1158

perror("setuid");

1678

/* Lower privileges */

1679

errno = 0;

1680

if(take_down_interface){

1681

/* Lower privileges */

1682

ret = seteuid(uid);

1683

if(ret == -1){

1684

perror_plus("seteuid");

1685

}

1686

} else {

1687

/* Lower privileges permanently */

1688

ret = setuid(uid);

1689

if(ret == -1){

1690

perror_plus("setuid");

1691

}

1692

}

1693

}

1694

1695

if(quit_now){

1696

goto end;

1159

1697

}

1160

1698

1161

1699

ret = init_gnutls_global(pubkey, seckey);

1162

1700

if(ret == -1){

1163

1701

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

1164

exitcode = EXIT_FAILURE;

1702

exitcode = EX_UNAVAILABLE;

1165

1703

goto end;

1166

1704

} else {

1167

1705

gnutls_initialized = true;

1168

1706

}

1169

1707

1708

if(quit_now){

1709

goto end;

1710

}

1711

1170

1712

if(mkdtemp(tempdir) == NULL){

1171

perror("mkdtemp");

1713

perror_plus("mkdtemp");

1172

1714

goto end;

1173

1715

}

1174

1716

tempdir_created = true;

1175

1717

1718

if(quit_now){

1719

goto end;

1720

}

1721

1176

1722

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

1177

1723

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

1178

exitcode = EXIT_FAILURE;

1724

exitcode = EX_UNAVAILABLE;

1179

1725

goto end;

1180

1726

} else {

1181

1727

gpgme_initialized = true;

1182

1728

}

1183

1729

1184

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

1185

if_index = (AvahiIfIndex) if_nametoindex(interface);

1186

if(if_index == 0){

1187

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

1188

exitcode = EXIT_FAILURE;

1189

goto end;

1190

}

1730

if(quit_now){

1731

goto end;

1191

1732

}

1192

1733

1193

1734

if(connect_to != NULL){

1196

1737

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

1197

1738

if(address == NULL){

1198

1739

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

1199

exitcode = EXIT_FAILURE;

1200

goto end;

1201

}

1740

exitcode = EX_USAGE;

1741

goto end;

1742

}

1743

1744

if(quit_now){

1745

goto end;

1746

}

1747

1202

1748

uint16_t port;

1203

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1204

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1205

or address[numchars+1] != '\0'){

1749

errno = 0;

1750

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

1751

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

1752

or tmpmax != (uint16_t)tmpmax){

1206

1753

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

1207

exitcode = EXIT_FAILURE;

1208

goto end;

1209

}

1754

exitcode = EX_USAGE;

1755

goto end;

1756

}

1757

1758

if(quit_now){

1759

goto end;

1760

}

1761

1210

1762

port = (uint16_t)tmpmax;

1211

1763

*address = '\0';

1212

1764

address = connect_to;

1217

1769

} else {

1218

1770

af = AF_INET;

1219

1771

}

1220

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

1221

if(ret < 0){

1222

exitcode = EXIT_FAILURE;

1223

} else {

1772

1773

if(quit_now){

1774

goto end;

1775

}

1776

1777

while(not quit_now){

1778

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

1779

if(quit_now or ret == 0){

1780

break;

1781

}

1782

sleep((int)retry_interval or 1);

1783

};

1784

1785

if (not quit_now){

1224

1786

exitcode = EXIT_SUCCESS;

1225

1787

}

1226

goto end;

1227

}

1228

1788

1789

goto end;

1790

}

1791

1792

if(quit_now){

1793

goto end;

1794

}

1795

1229

1796

{

1230

1797

AvahiServerConfig config;

1231

1798

/* Do not publish any local Zeroconf records */

1248

1815

if(mc.server == NULL){

1249

1816

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

1250

1817

avahi_strerror(error));

1251

exitcode = EXIT_FAILURE;

1818

exitcode = EX_UNAVAILABLE;

1819

goto end;

1820

}

1821

1822

if(quit_now){

1252

1823

goto end;

1253

1824

}

1254

1825

1255

1826

/* Create the Avahi service browser */

1256

1827

sb = avahi_s_service_browser_new(mc.server, if_index,

1257

AVAHI_PROTO_INET6, "_mandos._tcp",

1828

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1258

1829

NULL, 0, browse_callback, NULL);

1259

1830

if(sb == NULL){

1260

1831

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

1261

1832

avahi_strerror(avahi_server_errno(mc.server)));

1262

exitcode = EXIT_FAILURE;

1833

exitcode = EX_UNAVAILABLE;

1834

goto end;

1835

}

1836

1837

if(quit_now){

1263

1838

goto end;

1264

1839

}

1265

1840

1268

1843

if(debug){

1269

1844

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

1270

1845

}

1271

1272

avahi_simple_poll_loop(mc.simple_poll);

1846

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

1848

if(debug){

1849

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

1850

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

1851

}

1273

1852

1274

1853

end:

1275

1854

1296

1875

if(gpgme_initialized){

1297

1876

gpgme_release(mc.ctx);

1298

1877

}

1299

1300

/* Removes the temp directory used by GPGME */

1878

1879

/* cleans up the circular linked list of mandos servers the client has seen */

1880

if(mc.current_server != NULL){

1881

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

1882

while(mc.current_server != NULL){

1883

server *next = mc.current_server->next;

1884

free(mc.current_server);

1885

mc.current_server = next;

1886

}

1887

}

1888

1889

/* Take down the network interface */

1890

if(take_down_interface){

1891

/* Re-raise priviliges */

1892

errno = 0;

1893

ret = seteuid(0);

1894

if(ret == -1){

1895

perror_plus("seteuid");

1896

}

1897

if(geteuid() == 0){

1898

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

1899

if(ret == -1){

1900

perror_plus("ioctl SIOCGIFFLAGS");

1901

} else if(network.ifr_flags & IFF_UP) {

1902

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

1903

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

1904

if(ret == -1){

1905

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1906

}

1907

}

1908

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

1909

if(ret == -1){

1910

perror_plus("close");

1911

}

1912

/* Lower privileges permanently */

1913

errno = 0;

1914

ret = setuid(uid);

1915

if(ret == -1){

1916

perror_plus("setuid");

1917

}

1918

}

1919

}

1920

1921

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

1301

1922

if(tempdir_created){

1302

DIR *d;

1303

struct dirent *direntry;

1304

d = opendir(tempdir);

1305

if(d == NULL){

1306

if(errno != ENOENT){

1307

perror("opendir");

1308

}

1309

} else {

1310

while(true){

1311

direntry = readdir(d);

1312

if(direntry == NULL){

1313

break;

1314

}

1315

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

1316

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

1317

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

1318

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

1319

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

1320

continue;

1321

}

1923

struct dirent **direntries = NULL;

1924

struct dirent *direntry = NULL;

1925

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1926

if (ret > 0){

1927

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

1928

direntry = direntries[i];

1322

1929

char *fullname = NULL;

1323

1930

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

1324

1931

direntry->d_name);

1325

1932

if(ret < 0){

1326

perror("asprintf");

1933

perror_plus("asprintf");

1327

1934

continue;

1328

1935

}

1329

1936

ret = remove(fullname);

1333

1940

}

1334

1941

free(fullname);

1335

1942

}

1336

closedir(d);

1943

}

1944

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

1946

free(direntries);

1947

if (ret == -1){

1948

perror_plus("scandir");

1337

1949

}

1338

1950

ret = rmdir(tempdir);

1339

1951

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

1340

perror("rmdir");

1341

}

1952

perror_plus("rmdir");

1953

}

1954

}

1955

1956

if(quit_now){

1957

sigemptyset(&old_sigterm_action.sa_mask);

1958

old_sigterm_action.sa_handler = SIG_DFL;

1959

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1960

&old_sigterm_action,

1961

NULL));

1962

if(ret == -1){

1963

perror_plus("sigaction");

1964

}

1965

do {

1966

ret = raise(signal_received);

1967

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

1968

if(ret != 0){

1969

perror_plus("raise");

1970

abort();

1971

}

1972

TEMP_FAILURE_RETRY(pause());

1342

1973

}

1343

1974

1344

1975

return exitcode;