/mandos/release : revision 237.2.74

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

34

33

#define _LARGEFILE_SOURCE

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

34

#define _FILE_OFFSET_BITS 64

38

#endif

39

35

40

36

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

41

37

43

39

stdout, ferror(), remove() */

44

40

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

45

41

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

46

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

47

strtof(), abort() */

42

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

43

srand(), strtof() */

48

44

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

49

45

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

50

46

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

62

58

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

63

59

strtoimax() */

64

60

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

65

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

66

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

61

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

62

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

67

63

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

68

64

SIOCSIFFLAGS, if_indextoname(),

69

65

if_nametoindex(), IF_NAMESIZE */

71

67

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

68

*/

73

69

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

74

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

75

setgid(), pause() */

70

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

71

setgid() */

76

72

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

77

73

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

78

74

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

80

76

argp_parse(), ARGP_KEY_ARG,

81

77

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

78

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

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 */

79

sigaction(), SIGTERM, sigaction,

80

sig_atomic_t */

87

81

88

82

#ifdef __linux__

89

83

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

127

121

static const char mandos_protocol_version[] = "1";

128

122

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

129

123

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;

143

124

144

125

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

145

126

typedef struct {

150

131

gnutls_dh_params_t dh_params;

151

132

const char *priority;

152

133

gpgme_ctx_t ctx;

153

server *current_server;

154

134

} mandos_context;

155

135

156

136

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

157

137

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

158

138

.dh_bits = 1024, .priority = "SECURE256"

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

}

139

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

169

140

170

141

/*

171

142

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

184

155

return buffer_capacity;

185

156

}

186

157

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

224

158

/*

225

159

* Initialize GPGME.

226

160

*/

227

161

static bool init_gpgme(const char *seckey,

228

162

const char *pubkey, const char *tempdir){

163

int ret;

229

164

gpgme_error_t rc;

230

165

gpgme_engine_info_t engine_info;

231

166

234

169

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

235

170

*/

236

171

bool import_key(const char *filename){

237

int ret;

238

172

int fd;

239

173

gpgme_data_t pgp_data;

240

174

241

175

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

242

176

if(fd == -1){

243

perror_plus("open");

177

perror("open");

244

178

return false;

245

179

}

246

180

260

194

261

195

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

262

196

if(ret == -1){

263

perror_plus("close");

197

perror("close");

264

198

}

265

199

gpgme_data_release(pgp_data);

266

200

return true;

311

245

return false;

312

246

}

313

247

314

return true;

248

return true;

315

249

}

316

250

317

251

/*

371

305

}

372

306

gpgme_recipient_t recipient;

373

307

recipient = result->recipients;

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;

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

}

382

318

}

383

319

}

384

320

}

391

327

392

328

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

393

329

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

394

perror_plus("gpgme_data_seek");

330

perror("gpgme_data_seek");

395

331

plaintext_length = -1;

396

332

goto decrypt_end;

397

333

}

402

338

(size_t)plaintext_length,

403

339

plaintext_capacity);

404

340

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

341

perror("incbuffer");

406

342

plaintext_length = -1;

407

343

goto decrypt_end;

408

344

}

415

351

break;

416

352

}

417

353

if(ret < 0){

418

perror_plus("gpgme_data_read");

354

perror("gpgme_data_read");

419

355

plaintext_length = -1;

420

356

goto decrypt_end;

421

357

}

536

472

static int init_gnutls_session(gnutls_session_t *session){

537

473

int ret;

538

474

/* GnuTLS session creation */

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);

475

ret = gnutls_init(session, GNUTLS_SERVER);

545

476

if(ret != GNUTLS_E_SUCCESS){

546

477

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

547

478

safer_gnutls_strerror(ret));

549

480

550

481

{

551

482

const char *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);

483

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

559

484

if(ret != GNUTLS_E_SUCCESS){

560

485

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

561

486

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

565

490

}

566

491

}

567

492

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);

493

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

494

mc.cred);

576

495

if(ret != GNUTLS_E_SUCCESS){

577

496

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

578

497

safer_gnutls_strerror(ret));

581

500

}

582

501

583

502

/* ignore client certificate if any. */

584

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

503

gnutls_certificate_server_set_request(*session,

504

GNUTLS_CERT_IGNORE);

585

505

586

506

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

587

507

596

516

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

597

517

AvahiIfIndex if_index,

598

518

int af){

599

int ret, tcp_sd = -1;

519

int ret, tcp_sd;

600

520

ssize_t sret;

601

521

union {

602

522

struct sockaddr_in in;

603

523

struct sockaddr_in6 in6;

604

524

} to;

605

525

char *buffer = NULL;

606

char *decrypted_buffer = NULL;

526

char *decrypted_buffer;

607

527

size_t buffer_length = 0;

608

528

size_t buffer_capacity = 0;

529

ssize_t decrypted_buffer_size;

609

530

size_t written;

610

int retval = -1;

531

int retval = 0;

611

532

gnutls_session_t session;

612

533

int pf; /* Protocol family */

613

534

614

errno = 0;

615

616

if(quit_now){

617

errno = EINTR;

618

return -1;

619

}

620

621

535

switch(af){

622

536

case AF_INET6:

623

537

pf = PF_INET6;

627

541

break;

628

542

default:

629

543

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

630

errno = EINVAL;

631

544

return -1;

632

545

}

633

546

643

556

644

557

tcp_sd = socket(pf, SOCK_STREAM, 0);

645

558

if(tcp_sd < 0){

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;

559

perror("socket");

560

return -1;

655

561

}

656

562

657

563

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

658

564

if(af == AF_INET6){

659

to.in6.sin6_family = (sa_family_t)af;

565

to.in6.sin6_family = (uint16_t)af;

660

566

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

661

567

} else { /* IPv4 */

662

568

to.in.sin_family = (sa_family_t)af;

663

569

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

664

570

}

665

571

if(ret < 0 ){

666

int e = errno;

667

perror_plus("inet_pton");

668

errno = e;

669

goto mandos_end;

572

perror("inet_pton");

573

return -1;

670

574

}

671

575

if(ret == 0){

672

int e = errno;

673

576

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

674

errno = e;

675

goto mandos_end;

577

return -1;

676

578

}

677

579

if(af == AF_INET6){

678

580

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

685

587

if(if_index == AVAHI_IF_UNSPEC){

686

588

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

687

589

" without a network interface\n");

688

errno = EINVAL;

689

goto mandos_end;

590

return -1;

690

591

}

691

592

/* Set the network interface number as scope */

692

593

to.in6.sin6_scope_id = (uint32_t)if_index;

697

598

-Wunreachable-code */

698

599

}

699

600

700

if(quit_now){

701

errno = EINTR;

702

goto mandos_end;

703

}

704

705

601

if(debug){

706

602

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

707

603

char interface[IF_NAMESIZE];

708

604

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

709

perror_plus("if_indextoname");

605

perror("if_indextoname");

710

606

} else {

711

607

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

712

608

ip, interface, port);

726

622

sizeof(addrstr));

727

623

}

728

624

if(pcret == NULL){

729

perror_plus("inet_ntop");

625

perror("inet_ntop");

730

626

} else {

731

627

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

732

628

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

734

630

}

735

631

}

736

632

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

742

633

if(af == AF_INET6){

743

634

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

744

635

} else {

745

636

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

746

637

}

747

638

if(ret < 0){

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;

639

perror("connect");

640

return -1;

759

641

}

760

642

761

643

const char *out = mandos_protocol_version;

765

647

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

766

648

out_size - written));

767

649

if(ret == -1){

768

int e = errno;

769

perror_plus("write");

770

errno = e;

650

perror("write");

651

retval = -1;

771

652

goto mandos_end;

772

653

}

773

654

written += (size_t)ret;

781

662

break;

782

663

}

783

664

}

784

785

if(quit_now){

786

errno = EINTR;

787

goto mandos_end;

788

}

789

665

}

790

666

791

667

if(debug){

792

668

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

793

669

}

794

670

795

if(quit_now){

796

errno = EINTR;

797

goto mandos_end;

798

}

799

800

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

801

671

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

672

803

if(quit_now){

804

errno = EINTR;

805

goto mandos_end;

806

}

807

808

do {

673

do{

809

674

ret = gnutls_handshake(session);

810

if(quit_now){

811

errno = EINTR;

812

goto mandos_end;

813

}

814

675

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

815

676

816

677

if(ret != GNUTLS_E_SUCCESS){

818

679

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

819

680

gnutls_perror(ret);

820

681

}

821

errno = EPROTO;

682

retval = -1;

822

683

goto mandos_end;

823

684

}

824

685

830

691

}

831

692

832

693

while(true){

833

834

if(quit_now){

835

errno = EINTR;

836

goto mandos_end;

837

}

838

839

694

buffer_capacity = incbuffer(&buffer, buffer_length,

840

695

buffer_capacity);

841

696

if(buffer_capacity == 0){

842

int e = errno;

843

perror_plus("incbuffer");

844

errno = e;

845

goto mandos_end;

846

}

847

848

if(quit_now){

849

errno = EINTR;

697

perror("incbuffer");

698

retval = -1;

850

699

goto mandos_end;

851

700

}

852

701

861

710

case GNUTLS_E_AGAIN:

862

711

break;

863

712

case GNUTLS_E_REHANDSHAKE:

864

do {

713

do{

865

714

ret = gnutls_handshake(session);

866

867

if(quit_now){

868

errno = EINTR;

869

goto mandos_end;

870

}

871

715

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

872

716

if(ret < 0){

873

717

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

874

718

gnutls_perror(ret);

875

errno = EPROTO;

719

retval = -1;

876

720

goto mandos_end;

877

721

}

878

722

break;

879

723

default:

880

724

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

881

725

" encrypted session with Mandos server\n");

726

retval = -1;

882

727

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

errno = EIO;

884

728

goto mandos_end;

885

729

}

886

730

} else {

892

736

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

893

737

}

894

738

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);

739

gnutls_bye(session, GNUTLS_SHUT_RDWR);

907

740

908

741

if(buffer_length > 0){

909

ssize_t decrypted_buffer_size;

910

742

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

743

buffer_length,

912

744

&decrypted_buffer);

913

745

if(decrypted_buffer_size >= 0){

914

915

746

written = 0;

916

747

while(written < (size_t) decrypted_buffer_size){

917

if(quit_now){

918

errno = EINTR;

919

goto mandos_end;

920

}

921

922

748

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

923

749

(size_t)decrypted_buffer_size - written,

924

750

stdout);

925

751

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

926

int e = errno;

927

752

if(debug){

928

753

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

929

754

strerror(errno));

930

755

}

931

errno = e;

932

goto mandos_end;

756

retval = -1;

757

break;

933

758

}

934

759

written += (size_t)ret;

935

760

}

936

retval = 0;

761

free(decrypted_buffer);

762

} else {

763

retval = -1;

937

764

}

765

} else {

766

retval = -1;

938

767

}

939

768

940

769

/* Shutdown procedure */

941

770

942

771

mandos_end:

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

}

772

free(buffer);

773

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

774

if(ret == -1){

775

perror("close");

962

776

}

777

gnutls_deinit(session);

963

778

return retval;

964

779

}

965

780

982

797

/* Called whenever a service has been resolved successfully or

983

798

timed out */

984

799

985

if(quit_now){

986

return;

987

}

988

989

800

switch(event){

990

801

default:

991

802

case AVAHI_RESOLVER_FAILURE:

1007

818

avahi_proto_to_af(proto));

1008

819

if(ret == 0){

1009

820

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1013

821

}

1014

822

}

1015

823

}

1031

839

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

1032

840

is removed from the LAN */

1033

841

1034

if(quit_now){

1035

return;

1036

}

1037

1038

842

switch(event){

1039

843

default:

1040

844

case AVAHI_BROWSER_FAILURE:

1050

854

the callback function is called the Avahi server will free the

1051

855

resolver for us. */

1052

856

1053

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

1054

name, type, domain, protocol, 0,

1055

resolve_callback, NULL) == NULL)

857

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

858

protocol, name, type, domain,

859

AVAHI_PROTO_INET6, 0,

860

resolve_callback, NULL)))

1056

861

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

1057

862

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

1058

863

break;

1069

874

}

1070

875

}

1071

876

1072

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

1073

static void handle_sigterm(int sig){

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){

1074

881

if(quit_now){

1075

882

return;

1076

883

}

1077

884

quit_now = 1;

1078

signal_received = sig;

1079

885

int old_errno = errno;

1080

/* set main loop to exit */

1081

886

if(mc.simple_poll != NULL){

1082

887

avahi_simple_poll_quit(mc.simple_poll);

1083

888

}

1084

889

errno = old_errno;

1085

890

}

1086

891

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

1264

892

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

1265

893

AvahiSServiceBrowser *sb = NULL;

1266

894

int error;

1268

896

intmax_t tmpmax;

1269

897

char *tmp;

1270

898

int exitcode = EXIT_SUCCESS;

1271

const char *interface = "";

899

const char *interface = "eth0";

1272

900

struct ifreq network;

1273

int sd = -1;

1274

bool take_down_interface = false;

901

int sd;

1275

902

uid_t uid;

1276

903

gid_t gid;

904

char *connect_to = NULL;

1277

905

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

1278

906

bool tempdir_created = false;

1279

907

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1280

908

const char *seckey = PATHDIR "/" SECKEY;

1281

909

const char *pubkey = PATHDIR "/" PUBKEY;

1282

910

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" };

1283

915

bool gnutls_initialized = false;

1284

916

bool gpgme_initialized = false;

1285

917

float delay = 2.5f;

1286

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

1287

918

1288

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

struct sigaction old_sigterm_action;

1289

920

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1290

921

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

1312

922

{

1313

923

struct argp_option options[] = {

1314

924

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

1343

953

.arg = "SECONDS",

1344

954

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

1345

955

.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 },

1359

956

{ .name = NULL }

1360

957

};

1361

958

1362

959

error_t parse_opt(int key, char *arg,

1363

960

struct argp_state *state){

1364

errno = 0;

1365

961

switch(key){

1366

962

case 128: /* --debug */

1367

963

debug = true;

1383

979

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

1384

980

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

1385

981

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

1386

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

982

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

983

exit(EXIT_FAILURE);

1387

984

}

1388

985

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

1389

986

break;

1394

991

errno = 0;

1395

992

delay = strtof(arg, &tmp);

1396

993

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

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

995

exit(EXIT_FAILURE);

1405

996

}

1406

997

break;

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);

998

case ARGP_KEY_ARG:

999

argp_usage(state);

1000

case ARGP_KEY_END:

1420

1001

break;

1421

1002

default:

1422

1003

return ARGP_ERR_UNKNOWN;

1423

1004

}

1424

return errno;

1005

return 0;

1425

1006

}

1426

1007

1427

1008

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

1428

1009

.args_doc = "",

1429

1010

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

1430

1011

" passwords from a Mandos server" };

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;

1012

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

1013

if(ret == ARGP_ERR_UNKNOWN){

1014

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

1015

exitcode = EXIT_FAILURE;

1444

1016

goto end;

1445

1017

}

1446

1018

}

1448

1020

if(not debug){

1449

1021

avahi_set_log_function(empty_log);

1450

1022

}

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

}

1476

1023

1477

1024

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

1478

1025

from the signal handler */

1481

1028

mc.simple_poll = avahi_simple_poll_new();

1482

1029

if(mc.simple_poll == NULL){

1483

1030

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

1484

exitcode = EX_UNAVAILABLE;

1031

exitcode = EXIT_FAILURE;

1485

1032

goto end;

1486

1033

}

1487

1034

1488

1035

sigemptyset(&sigterm_action.sa_mask);

1489

1036

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

1490

1037

if(ret == -1){

1491

perror_plus("sigaddset");

1492

exitcode = EX_OSERR;

1038

perror("sigaddset");

1039

exitcode = EXIT_FAILURE;

1493

1040

goto end;

1494

1041

}

1495

1042

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

1496

1043

if(ret == -1){

1497

perror_plus("sigaddset");

1498

exitcode = EX_OSERR;

1044

perror("sigaddset");

1045

exitcode = EXIT_FAILURE;

1499

1046

goto end;

1500

1047

}

1501

1048

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

1502

1049

if(ret == -1){

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

}

1050

perror("sigaddset");

1051

exitcode = EXIT_FAILURE;

1052

goto end;

1053

}

1054

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

1055

if(ret == -1){

1056

perror("sigaction");

1057

exitcode = EXIT_FAILURE;

1058

goto end;

1059

}

1550

1060

1551

1061

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

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

1062

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

1571

1063

#ifdef __linux__

1572

1064

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1573

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

1065

messages to mess up the prompt */

1574

1066

ret = klogctl(8, NULL, 5);

1575

1067

bool restore_loglevel = true;

1576

1068

if(ret == -1){

1577

1069

restore_loglevel = false;

1578

perror_plus("klogctl");

1070

perror("klogctl");

1579

1071

}

1580

1072

#endif /* __linux__ */

1581

1073

1582

1074

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1583

1075

if(sd < 0){

1584

perror_plus("socket");

1585

exitcode = EX_OSERR;

1076

perror("socket");

1077

exitcode = EXIT_FAILURE;

1586

1078

#ifdef __linux__

1587

1079

if(restore_loglevel){

1588

1080

ret = klogctl(7, NULL, 0);

1589

1081

if(ret == -1){

1590

perror_plus("klogctl");

1082

perror("klogctl");

1591

1083

}

1592

1084

}

1593

1085

#endif /* __linux__ */

1594

/* Lower privileges */

1595

errno = 0;

1596

ret = seteuid(uid);

1597

if(ret == -1){

1598

perror_plus("seteuid");

1599

}

1600

1086

goto end;

1601

1087

}

1602

1088

strcpy(network.ifr_name, interface);

1603

1089

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

1604

1090

if(ret == -1){

1605

perror_plus("ioctl SIOCGIFFLAGS");

1091

perror("ioctl SIOCGIFFLAGS");

1606

1092

#ifdef __linux__

1607

1093

if(restore_loglevel){

1608

1094

ret = klogctl(7, NULL, 0);

1609

1095

if(ret == -1){

1610

perror_plus("klogctl");

1096

perror("klogctl");

1611

1097

}

1612

1098

}

1613

1099

#endif /* __linux__ */

1614

exitcode = EX_OSERR;

1615

/* Lower privileges */

1616

errno = 0;

1617

ret = seteuid(uid);

1618

if(ret == -1){

1619

perror_plus("seteuid");

1620

}

1100

exitcode = EXIT_FAILURE;

1621

1101

goto end;

1622

1102

}

1623

1103

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

1624

1104

network.ifr_flags |= IFF_UP;

1625

take_down_interface = true;

1626

1105

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

1627

1106

if(ret == -1){

1628

take_down_interface = false;

1629

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1630

exitcode = EX_OSERR;

1107

perror("ioctl SIOCSIFFLAGS");

1108

exitcode = EXIT_FAILURE;

1631

1109

#ifdef __linux__

1632

1110

if(restore_loglevel){

1633

1111

ret = klogctl(7, NULL, 0);

1634

1112

if(ret == -1){

1635

perror_plus("klogctl");

1113

perror("klogctl");

1636

1114

}

1637

1115

}

1638

1116

#endif /* __linux__ */

1639

/* Lower privileges */

1640

errno = 0;

1641

ret = seteuid(uid);

1642

if(ret == -1){

1643

perror_plus("seteuid");

1644

}

1645

1117

goto end;

1646

1118

}

1647

1119

}

1648

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

1120

/* sleep checking until interface is running */

1649

1121

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

1650

1122

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

1651

1123

if(ret == -1){

1652

perror_plus("ioctl SIOCGIFFLAGS");

1124

perror("ioctl SIOCGIFFLAGS");

1653

1125

} else if(network.ifr_flags & IFF_RUNNING){

1654

1126

break;

1655

1127

}

1656

1128

struct timespec sleeptime = { .tv_nsec = 250000000 };

1657

1129

ret = nanosleep(&sleeptime, NULL);

1658

1130

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

1659

perror_plus("nanosleep");

1131

perror("nanosleep");

1660

1132

}

1661

1133

}

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

}

1134

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

1135

if(ret == -1){

1136

perror("close");

1668

1137

}

1669

1138

#ifdef __linux__

1670

1139

if(restore_loglevel){

1671

1140

/* Restores kernel loglevel to default */

1672

1141

ret = klogctl(7, NULL, 0);

1673

1142

if(ret == -1){

1674

perror_plus("klogctl");

1143

perror("klogctl");

1675

1144

}

1676

1145

}

1677

1146

#endif /* __linux__ */

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;

1147

}

1148

1149

uid = getuid();

1150

gid = getgid();

1151

1152

errno = 0;

1153

setgid(gid);

1154

if(ret == -1){

1155

perror("setgid");

1156

}

1157

1158

ret = setuid(uid);

1159

if(ret == -1){

1160

perror("setuid");

1697

1161

}

1698

1162

1699

1163

ret = init_gnutls_global(pubkey, seckey);

1700

1164

if(ret == -1){

1701

1165

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

1702

exitcode = EX_UNAVAILABLE;

1166

exitcode = EXIT_FAILURE;

1703

1167

goto end;

1704

1168

} else {

1705

1169

gnutls_initialized = true;

1706

1170

}

1707

1171

1708

if(quit_now){

1709

goto end;

1710

}

1711

1712

1172

if(mkdtemp(tempdir) == NULL){

1713

perror_plus("mkdtemp");

1173

perror("mkdtemp");

1714

1174

goto end;

1715

1175

}

1716

1176

tempdir_created = true;

1717

1177

1718

if(quit_now){

1719

goto end;

1720

}

1721

1722

1178

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

1723

1179

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

1724

exitcode = EX_UNAVAILABLE;

1180

exitcode = EXIT_FAILURE;

1725

1181

goto end;

1726

1182

} else {

1727

1183

gpgme_initialized = true;

1728

1184

}

1729

1185

1730

if(quit_now){

1731

goto end;

1186

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

1187

if_index = (AvahiIfIndex) if_nametoindex(interface);

1188

if(if_index == 0){

1189

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

1190

exitcode = EXIT_FAILURE;

1191

goto end;

1192

}

1732

1193

}

1733

1194

1734

1195

if(connect_to != NULL){

1737

1198

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

1738

1199

if(address == NULL){

1739

1200

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

1740

exitcode = EX_USAGE;

1741

goto end;

1742

}

1743

1744

if(quit_now){

1745

goto end;

1746

}

1747

1201

exitcode = EXIT_FAILURE;

1202

goto end;

1203

}

1748

1204

uint16_t port;

1749

1205

errno = 0;

1750

1206

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

1751

1207

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

1752

1208

or tmpmax != (uint16_t)tmpmax){

1753

1209

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

1754

exitcode = EX_USAGE;

1755

goto end;

1756

}

1757

1758

if(quit_now){

1759

goto end;

1760

}

1761

1210

exitcode = EXIT_FAILURE;

1211

goto end;

1212

}

1762

1213

port = (uint16_t)tmpmax;

1763

1214

*address = '\0';

1764

1215

address = connect_to;

1769

1220

} else {

1770

1221

af = AF_INET;

1771

1222

}

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){

1223

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

1224

if(ret < 0){

1225

exitcode = EXIT_FAILURE;

1226

} else {

1786

1227

exitcode = EXIT_SUCCESS;

1787

1228

}

1788

1789

goto end;

1790

}

1791

1792

if(quit_now){

1793

goto end;

1794

}

1795

1229

goto end;

1230

}

1231

1796

1232

{

1797

1233

AvahiServerConfig config;

1798

1234

/* Do not publish any local Zeroconf records */

1815

1251

if(mc.server == NULL){

1816

1252

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

1817

1253

avahi_strerror(error));

1818

exitcode = EX_UNAVAILABLE;

1819

goto end;

1820

}

1821

1822

if(quit_now){

1254

exitcode = EXIT_FAILURE;

1823

1255

goto end;

1824

1256

}

1825

1257

1826

1258

/* Create the Avahi service browser */

1827

1259

sb = avahi_s_service_browser_new(mc.server, if_index,

1828

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1260

AVAHI_PROTO_INET6, "_mandos._tcp",

1829

1261

NULL, 0, browse_callback, NULL);

1830

1262

if(sb == NULL){

1831

1263

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

1832

1264

avahi_strerror(avahi_server_errno(mc.server)));

1833

exitcode = EX_UNAVAILABLE;

1834

goto end;

1835

}

1836

1837

if(quit_now){

1265

exitcode = EXIT_FAILURE;

1838

1266

goto end;

1839

1267

}

1840

1268

1843

1271

if(debug){

1844

1272

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

1845

1273

}

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

}

1274

1275

avahi_simple_poll_loop(mc.simple_poll);

1852

1276

1853

1277

end:

1854

1278

1875

1299

if(gpgme_initialized){

1876

1300

gpgme_release(mc.ctx);

1877

1301

}

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 */

1302

1303

/* Removes the temp directory used by GPGME */

1922

1304

if(tempdir_created){

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];

1305

DIR *d;

1306

struct dirent *direntry;

1307

d = opendir(tempdir);

1308

if(d == NULL){

1309

if(errno != ENOENT){

1310

perror("opendir");

1311

}

1312

} else {

1313

while(true){

1314

direntry = readdir(d);

1315

if(direntry == NULL){

1316

break;

1317

}

1318

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

1319

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

1320

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

1321

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

1322

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

1323

continue;

1324

}

1929

1325

char *fullname = NULL;

1930

1326

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

1931

1327

direntry->d_name);

1932

1328

if(ret < 0){

1933

perror_plus("asprintf");

1329

perror("asprintf");

1934

1330

continue;

1935

1331

}

1936

1332

ret = remove(fullname);

1940

1336

}

1941

1337

free(fullname);

1942

1338

}

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");

1339

closedir(d);

1949

1340

}

1950

1341

ret = rmdir(tempdir);

1951

1342

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

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());

1343

perror("rmdir");

1344

}

1973

1345

}

1974

1346

1975

1347

return exitcode;