/mandos/release : revision 237.15.2

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

26

* along with this program. If not, see

27

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

28

*

29

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

29

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

30

*/

31

32

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

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

srand(), strtof() */

46

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

47

strtof(), abort() */

48

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

49

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

50

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

62

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

63

strtoimax() */

64

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

65

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

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

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

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

71

72

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

73

*/

73

74

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

74

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

75

setgid() */

76

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

75

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

76

setgid(), pause() */

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

82

83

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

83

84

sigaction(), SIGTERM, sig_atomic_t,

84

85

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

85

88

86

89

#ifdef __linux__

87

90

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

124

127

bool debug = false;

125

128

static const char mandos_protocol_version[] = "1";

126

129

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

127

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

130

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

131

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

132

char *connect_to = NULL;

133

134

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

135

typedef struct server{

136

const char *ip;

137

uint16_t port;

138

AvahiIfIndex if_index;

139

int af;

140

struct timespec last_seen;

141

struct server *next;

142

struct server *prev;

143

} server;

128

144

129

145

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

130

146

typedef struct {

135

151

gnutls_dh_params_t dh_params;

136

152

const char *priority;

137

153

gpgme_ctx_t ctx;

154

server *current_server;

138

155

} mandos_context;

139

156

140

157

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

141

158

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

142

159

.dh_bits = 1024, .priority = "SECURE256"

143

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

160

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

161

.current_server = NULL };

162

163

sig_atomic_t quit_now = 0;

164

int signal_received = 0;

165

166

/* Function to use when printing errors */

167

void perror_plus(const char *print_text){

168

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

169

program_invocation_short_name);

170

perror(print_text);

171

}

144

172

145

173

/*

146

174

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

159

187

return buffer_capacity;

160

188

}

161

189

190

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

191

int add_server(const char *ip, uint16_t port,

192

AvahiIfIndex if_index,

193

int af){

194

int ret;

195

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

196

if(new_server == NULL){

197

perror_plus("malloc");

198

return -1;

199

}

200

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

201

.port = port,

202

.if_index = if_index,

203

.af = af };

204

if(new_server->ip == NULL){

205

perror_plus("strdup");

206

return -1;

207

}

208

/* Special case of first server */

209

if (mc.current_server == NULL){

210

new_server->next = new_server;

211

new_server->prev = new_server;

212

mc.current_server = new_server;

213

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

214

} else {

215

new_server->next = mc.current_server;

216

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

217

new_server->prev->next = new_server;

218

mc.current_server->prev = new_server;

219

}

220

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

221

if(ret == -1){

222

perror_plus("clock_gettime");

223

return -1;

224

}

225

return 0;

226

}

227

162

228

/*

163

229

* Initialize GPGME.

164

230

*/

165

231

static bool init_gpgme(const char *seckey,

166

232

const char *pubkey, const char *tempdir){

167

int ret;

168

233

gpgme_error_t rc;

169

234

gpgme_engine_info_t engine_info;

170

235

173

238

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

174

239

*/

175

240

bool import_key(const char *filename){

241

int ret;

176

242

int fd;

177

243

gpgme_data_t pgp_data;

178

244

179

245

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

180

246

if(fd == -1){

181

perror("open");

247

perror_plus("open");

182

248

return false;

183

249

}

184

250

198

264

199

265

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

200

266

if(ret == -1){

201

perror("close");

267

perror_plus("close");

202

268

}

203

269

gpgme_data_release(pgp_data);

204

270

return true;

217

283

return false;

218

284

}

219

285

220

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

286

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

221

287

rc = gpgme_get_engine_info(&engine_info);

222

288

if(rc != GPG_ERR_NO_ERROR){

223

289

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

329

395

330

396

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

331

397

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

332

perror("gpgme_data_seek");

398

perror_plus("gpgme_data_seek");

333

399

plaintext_length = -1;

334

400

goto decrypt_end;

335

401

}

340

406

(size_t)plaintext_length,

341

407

plaintext_capacity);

342

408

if(plaintext_capacity == 0){

343

perror("incbuffer");

409

perror_plus("incbuffer");

344

410

plaintext_length = -1;

345

411

goto decrypt_end;

346

412

}

353

419

break;

354

420

}

355

421

if(ret < 0){

356

perror("gpgme_data_read");

422

perror_plus("gpgme_data_read");

357

423

plaintext_length = -1;

358

424

goto decrypt_end;

359

425

}

416

482

}

417

483

418

484

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

486

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

487

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

425

488

safer_gnutls_strerror(ret));

426

489

gnutls_global_deinit();

427

490

return -1;

474

537

static int init_gnutls_session(gnutls_session_t *session){

475

538

int ret;

476

539

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

540

do {

541

ret = gnutls_init(session, GNUTLS_SERVER);

542

if(quit_now){

543

return -1;

544

}

545

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

478

546

if(ret != GNUTLS_E_SUCCESS){

479

547

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

480

548

safer_gnutls_strerror(ret));

482

550

483

551

{

484

552

const char *err;

485

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

553

do {

554

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

555

if(quit_now){

556

gnutls_deinit(*session);

557

return -1;

558

}

559

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

486

560

if(ret != GNUTLS_E_SUCCESS){

487

561

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

488

562

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

492

566

}

493

567

}

494

568

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

569

do {

570

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

571

mc.cred);

572

if(quit_now){

573

gnutls_deinit(*session);

574

return -1;

575

}

576

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

497

577

if(ret != GNUTLS_E_SUCCESS){

498

578

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

499

579

safer_gnutls_strerror(ret));

502

582

}

503

583

504

584

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

586

508

587

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

588

514

593

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

515

594

__attribute__((unused)) const char *txt){}

516

595

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

596

/* Called when a Mandos server is found */

521

597

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

522

598

AvahiIfIndex if_index,

528

604

struct sockaddr_in6 in6;

529

605

} to;

530

606

char *buffer = NULL;

531

char *decrypted_buffer;

607

char *decrypted_buffer = NULL;

532

608

size_t buffer_length = 0;

533

609

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

535

610

size_t written;

536

int retval = 0;

611

int retval = -1;

537

612

gnutls_session_t session;

538

613

int pf; /* Protocol family */

539

614

615

errno = 0;

616

540

617

if(quit_now){

618

errno = EINTR;

541

619

return -1;

542

620

}

543

621

550

628

break;

551

629

default:

552

630

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

631

errno = EINVAL;

553

632

return -1;

554

633

}

555

634

565

644

566

645

tcp_sd = socket(pf, SOCK_STREAM, 0);

567

646

if(tcp_sd < 0){

568

perror("socket");

569

retval = -1;

647

int e = errno;

648

perror_plus("socket");

649

errno = e;

570

650

goto mandos_end;

571

651

}

572

652

573

653

if(quit_now){

654

errno = EINTR;

574

655

goto mandos_end;

575

656

}

576

657

583

664

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

584

665

}

585

666

if(ret < 0 ){

586

perror("inet_pton");

587

retval = -1;

667

int e = errno;

668

perror_plus("inet_pton");

669

errno = e;

588

670

goto mandos_end;

589

671

}

590

672

if(ret == 0){

673

int e = errno;

591

674

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

592

retval = -1;

675

errno = e;

593

676

goto mandos_end;

594

677

}

595

678

if(af == AF_INET6){

603

686

if(if_index == AVAHI_IF_UNSPEC){

604

687

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

605

688

" without a network interface\n");

606

retval = -1;

689

errno = EINVAL;

607

690

goto mandos_end;

608

691

}

609

692

/* Set the network interface number as scope */

616

699

}

617

700

618

701

if(quit_now){

702

errno = EINTR;

619

703

goto mandos_end;

620

704

}

621

705

623

707

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

624

708

char interface[IF_NAMESIZE];

625

709

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

626

perror("if_indextoname");

710

perror_plus("if_indextoname");

627

711

} else {

628

712

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

629

713

ip, interface, port);

643

727

sizeof(addrstr));

644

728

}

645

729

if(pcret == NULL){

646

perror("inet_ntop");

730

perror_plus("inet_ntop");

647

731

} else {

648

732

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

649

733

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

652

736

}

653

737

654

738

if(quit_now){

739

errno = EINTR;

655

740

goto mandos_end;

656

741

}

657

742

661

746

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

662

747

}

663

748

if(ret < 0){

664

perror("connect");

665

retval = -1;

749

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

750

int e = errno;

751

perror_plus("connect");

752

errno = e;

753

}

666

754

goto mandos_end;

667

755

}

668

756

669

757

if(quit_now){

758

errno = EINTR;

670

759

goto mandos_end;

671

760

}

672

761

677

766

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

678

767

out_size - written));

679

768

if(ret == -1){

680

perror("write");

681

retval = -1;

769

int e = errno;

770

perror_plus("write");

771

errno = e;

682

772

goto mandos_end;

683

773

}

684

774

written += (size_t)ret;

694

784

}

695

785

696

786

if(quit_now){

787

errno = EINTR;

697

788

goto mandos_end;

698

789

}

699

790

}

703

794

}

704

795

705

796

if(quit_now){

797

errno = EINTR;

706

798

goto mandos_end;

707

799

}

708

800

801

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

709

802

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

710

803

711

804

if(quit_now){

805

errno = EINTR;

712

806

goto mandos_end;

713

807

}

714

808

715

do{

809

do {

716

810

ret = gnutls_handshake(session);

717

811

if(quit_now){

812

errno = EINTR;

718

813

goto mandos_end;

719

814

}

720

815

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

724

819

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

725

820

gnutls_perror(ret);

726

821

}

727

retval = -1;

822

errno = EPROTO;

728

823

goto mandos_end;

729

824

}

730

825

738

833

while(true){

739

834

740

835

if(quit_now){

836

errno = EINTR;

741

837

goto mandos_end;

742

838

}

743

839

744

840

buffer_capacity = incbuffer(&buffer, buffer_length,

745

841

buffer_capacity);

746

842

if(buffer_capacity == 0){

747

perror("incbuffer");

748

retval = -1;

843

int e = errno;

844

perror_plus("incbuffer");

845

errno = e;

749

846

goto mandos_end;

750

847

}

751

848

752

849

if(quit_now){

850

errno = EINTR;

753

851

goto mandos_end;

754

852

}

755

853

764

862

case GNUTLS_E_AGAIN:

765

863

break;

766

864

case GNUTLS_E_REHANDSHAKE:

767

do{

865

do {

768

866

ret = gnutls_handshake(session);

769

867

770

868

if(quit_now){

869

errno = EINTR;

771

870

goto mandos_end;

772

871

}

773

872

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

774

873

if(ret < 0){

775

874

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

776

875

gnutls_perror(ret);

777

retval = -1;

876

errno = EPROTO;

778

877

goto mandos_end;

779

878

}

780

879

break;

781

880

default:

782

881

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

783

882

" encrypted session with Mandos server\n");

784

retval = -1;

785

883

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

errno = EIO;

786

885

goto mandos_end;

787

886

}

788

887

} else {

795

894

}

796

895

797

896

if(quit_now){

798

goto mandos_end;

799

}

800

801

gnutls_bye(session, GNUTLS_SHUT_RDWR);

802

803

if(quit_now){

804

goto mandos_end;

805

}

897

errno = EINTR;

898

goto mandos_end;

899

}

900

901

do {

902

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

903

if(quit_now){

904

errno = EINTR;

905

goto mandos_end;

906

}

907

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

806

908

807

909

if(buffer_length > 0){

910

ssize_t decrypted_buffer_size;

808

911

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

912

buffer_length,

810

913

&decrypted_buffer);

811

914

if(decrypted_buffer_size >= 0){

915

812

916

written = 0;

813

917

while(written < (size_t) decrypted_buffer_size){

814

918

if(quit_now){

919

errno = EINTR;

815

920

goto mandos_end;

816

921

}

817

922

819

924

(size_t)decrypted_buffer_size - written,

820

925

stdout);

821

926

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

927

int e = errno;

822

928

if(debug){

823

929

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

824

930

strerror(errno));

825

931

}

826

retval = -1;

827

break;

932

errno = e;

933

goto mandos_end;

828

934

}

829

935

written += (size_t)ret;

830

936

}

831

free(decrypted_buffer);

832

} else {

833

retval = -1;

937

retval = 0;

834

938

}

835

} else {

836

retval = -1;

837

939

}

838

940

839

941

/* Shutdown procedure */

840

942

841

943

mandos_end:

842

free(buffer);

843

if(tcp_sd >= 0){

844

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

845

}

846

if(ret == -1){

847

perror("close");

848

}

849

gnutls_deinit(session);

850

if(quit_now){

851

retval = -1;

944

{

945

int e = errno;

946

free(decrypted_buffer);

947

free(buffer);

948

if(tcp_sd >= 0){

949

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

950

}

951

if(ret == -1){

952

if(e == 0){

953

e = errno;

954

}

955

perror_plus("close");

956

}

957

gnutls_deinit(session);

958

errno = e;

959

if(quit_now){

960

errno = EINTR;

961

retval = -1;

962

}

852

963

}

853

964

return retval;

854

965

}

897

1008

avahi_proto_to_af(proto));

898

1009

if(ret == 0){

899

1010

avahi_simple_poll_quit(mc.simple_poll);

1011

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

900

1014

}

901

1015

}

902

1016

}

956

1070

}

957

1071

}

958

1072

959

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

1073

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

960

1074

static void handle_sigterm(int sig){

961

1075

if(quit_now){

962

1076

return;

964

1078

quit_now = 1;

965

1079

signal_received = sig;

966

1080

int old_errno = errno;

1081

/* set main loop to exit */

967

1082

if(mc.simple_poll != NULL){

968

1083

avahi_simple_poll_quit(mc.simple_poll);

969

1084

}

970

1085

errno = old_errno;

971

1086

}

972

1087

1088

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

1089

int ret;

1090

1091

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

1092

if(s < 0){

1093

perror_plus("socket");

1094

return false;

1095

}

1096

strcpy(ifr->ifr_name, ifname);

1097

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1098

if(ret == -1){

1099

if(debug){

1100

perror_plus("ioctl SIOCGIFFLAGS");

1101

}

1102

return false;

1103

}

1104

return true;

1105

}

1106

1107

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

1108

1109

/* Reject the loopback device */

1110

if(ifr->ifr_flags & IFF_LOOPBACK){

1111

if(debug){

1112

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

1113

ifname);

1114

}

1115

return false;

1116

}

1117

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

1118

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

1119

if(debug){

1120

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

1121

ifname);

1122

}

1123

return true;

1124

}

1125

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

1126

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

1127

if(debug){

1128

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

1129

ifname);

1130

}

1131

return false;

1132

}

1133

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

1134

if(ifr->ifr_flags & IFF_NOARP){

1135

if(debug){

1136

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

1137

}

1138

return false;

1139

}

1140

1141

/* Accept this device */

1142

if(debug){

1143

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

1144

}

1145

return true;

1146

}

1147

1148

/*

1149

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

1150

* corresponds to an acceptable network device.

1151

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

1152

*/

1153

int good_interface(const struct dirent *if_entry){

1154

int ret;

1155

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

1156

return 0;

1157

}

1158

struct ifreq ifr;

1159

1160

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

1161

return 0;

1162

}

1163

1164

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

1165

return 0;

1166

}

1167

return 1;

1168

}

1169

1170

int notdotentries(const struct dirent *direntry){

1171

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

1172

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

1173

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

1174

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

1175

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

1176

return 0;

1177

}

1178

return 1;

1179

}

1180

1181

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1182

int ret;

1183

struct timespec now;

1184

struct timespec waited_time;

1185

intmax_t block_time;

1186

1187

while(true){

1188

if(mc.current_server == NULL){

1189

if (debug){

1190

fprintf(stderr,

1191

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

1192

}

1193

ret = avahi_simple_poll_iterate(s, -1);

1194

} else {

1195

if (debug){

1196

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

1197

" or wait\n");

1198

}

1199

/* the current time */

1200

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1201

if(ret == -1){

1202

perror_plus("clock_gettime");

1203

return -1;

1204

}

1205

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

1206

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

1207

waited_time.tv_sec = (now.tv_sec

1208

- mc.current_server->last_seen.tv_sec);

1209

waited_time.tv_nsec = (now.tv_nsec

1210

- mc.current_server->last_seen.tv_nsec);

1211

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

1212

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

1213

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

1214

block_time = ((retry_interval

1215

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

1216

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

1217

1218

if (debug){

1219

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

1220

}

1221

1222

if(block_time <= 0){

1223

ret = start_mandos_communication(mc.current_server->ip,

1224

mc.current_server->port,

1225

mc.current_server->if_index,

1226

mc.current_server->af);

1227

if(ret == 0){

1228

avahi_simple_poll_quit(mc.simple_poll);

1229

return 0;

1230

}

1231

ret = clock_gettime(CLOCK_MONOTONIC,

1232

&mc.current_server->last_seen);

1233

if(ret == -1){

1234

perror_plus("clock_gettime");

1235

return -1;

1236

}

1237

mc.current_server = mc.current_server->next;

1238

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

1239

servers, but don't block */

1240

}

1241

1242

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

1243

}

1244

if(ret != 0){

1245

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

1246

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

1247

}

1248

}

1249

}

1250

}

1251

973

1252

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

974

1253

AvahiSServiceBrowser *sb = NULL;

975

1254

int error;

977

1256

intmax_t tmpmax;

978

1257

char *tmp;

979

1258

int exitcode = EXIT_SUCCESS;

980

const char *interface = "eth0";

1259

const char *interface = "";

981

1260

struct ifreq network;

982

1261

int sd = -1;

983

1262

bool take_down_interface = false;

984

1263

uid_t uid;

985

1264

gid_t gid;

986

char *connect_to = NULL;

987

1265

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

988

1266

bool tempdir_created = false;

989

1267

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

993

1271

bool gnutls_initialized = false;

994

1272

bool gpgme_initialized = false;

995

1273

float delay = 2.5f;

1274

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

1275

retrying the same server again */

996

1276

997

struct sigaction old_sigterm_action;

1277

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

1278

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

999

1279

1280

uid = getuid();

1281

gid = getgid();

1282

1283

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

1284

errno = 0;

1285

ret = setgid(gid);

1286

if(ret == -1){

1287

perror_plus("setgid");

1288

}

1289

1290

/* Lower user privileges (temporarily) */

1291

errno = 0;

1292

ret = seteuid(uid);

1293

if(ret == -1){

1294

perror_plus("seteuid");

1295

}

1296

1297

if(quit_now){

1298

goto end;

1299

}

1300

1000

1301

{

1001

1302

struct argp_option options[] = {

1002

1303

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

1031

1332

.arg = "SECONDS",

1032

1333

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

1033

1334

.group = 2 },

1335

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

1336

.arg = "SECONDS",

1337

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

1338

.group = 2 },

1339

/*

1340

* These reproduce what we would get without ARGP_NO_HELP

1341

*/

1342

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

1343

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

1344

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

1345

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

1346

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

1347

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

1034

1348

{ .name = NULL }

1035

1349

};

1036

1350

1037

1351

error_t parse_opt(int key, char *arg,

1038

1352

struct argp_state *state){

1353

errno = 0;

1039

1354

switch(key){

1040

1355

case 128: /* --debug */

1041

1356

debug = true;

1057

1372

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

1058

1373

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

1059

1374

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

1060

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

1061

exit(EXIT_FAILURE);

1375

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

1062

1376

}

1063

1377

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

1064

1378

break;

1069

1383

errno = 0;

1070

1384

delay = strtof(arg, &tmp);

1071

1385

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

1072

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

1073

exit(EXIT_FAILURE);

1386

argp_error(state, "Bad delay");

1387

}

1388

case 132: /* --retry */

1389

errno = 0;

1390

retry_interval = strtod(arg, &tmp);

1391

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

1392

or (retry_interval * 1000) > INT_MAX

1393

or retry_interval < 0){

1394

argp_error(state, "Bad retry interval");

1074

1395

}

1075

1396

break;

1076

case ARGP_KEY_ARG:

1077

argp_usage(state);

1078

case ARGP_KEY_END:

1397

/*

1398

* These reproduce what we would get without ARGP_NO_HELP

1399

*/

1400

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

1401

argp_state_help(state, state->out_stream,

1402

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1403

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1404

case -3: /* --usage */

1405

argp_state_help(state, state->out_stream,

1406

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1407

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

1408

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

1409

exit(argp_err_exit_status);

1079

1410

break;

1080

1411

default:

1081

1412

return ARGP_ERR_UNKNOWN;

1082

1413

}

1083

return 0;

1414

return errno;

1084

1415

}

1085

1416

1086

1417

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

1087

1418

.args_doc = "",

1088

1419

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

1089

1420

" passwords from a Mandos server" };

1090

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

1091

if(ret == ARGP_ERR_UNKNOWN){

1092

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

1093

exitcode = EXIT_FAILURE;

1094

goto end;

1421

ret = argp_parse(&argp, argc, argv,

1422

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1423

switch(ret){

1424

case 0:

1425

break;

1426

case ENOMEM:

1427

default:

1428

errno = ret;

1429

perror_plus("argp_parse");

1430

exitcode = EX_OSERR;

1431

goto end;

1432

case EINVAL:

1433

exitcode = EX_USAGE;

1434

goto end;

1435

}

1436

}

1437

1438

{

1439

/* Work around Debian bug #633582:

1440

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

1441

struct stat st;

1442

1443

/* Re-raise priviliges */

1444

errno = 0;

1445

ret = seteuid(0);

1446

if(ret == -1){

1447

perror_plus("seteuid");

1448

}

1449

1450

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

1451

int seckey_fd = open(seckey, O_RDONLY);

1452

if(seckey_fd == -1){

1453

perror_plus("open");

1454

} else {

1455

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

1456

if(ret == -1){

1457

perror_plus("fstat");

1458

} else {

1459

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

1460

ret = fchown(seckey_fd, uid, gid);

1461

if(ret == -1){

1462

perror_plus("fchown");

1463

}

1464

}

1465

}

1466

TEMP_FAILURE_RETRY(close(seckey_fd));

1467

}

1468

}

1469

1470

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

1471

int pubkey_fd = open(pubkey, O_RDONLY);

1472

if(pubkey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

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

1480

ret = fchown(pubkey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(pubkey_fd));

1487

}

1488

}

1489

1490

/* Lower privileges */

1491

errno = 0;

1492

ret = seteuid(uid);

1493

if(ret == -1){

1494

perror_plus("seteuid");

1095

1495

}

1096

1496

}

1097

1497

1098

1498

if(not debug){

1099

1499

avahi_set_log_function(empty_log);

1100

1500

}

1501

1502

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

1503

struct dirent **direntries;

1504

ret = scandir(sys_class_net, &direntries, good_interface,

1505

alphasort);

1506

if(ret >= 1){

1507

/* Pick the first good interface */

1508

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

1509

if(debug){

1510

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

1511

}

1512

if(interface == NULL){

1513

perror_plus("malloc");

1514

free(direntries);

1515

exitcode = EXIT_FAILURE;

1516

goto end;

1517

}

1518

free(direntries);

1519

} else {

1520

free(direntries);

1521

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

1522

exitcode = EXIT_FAILURE;

1523

goto end;

1524

}

1525

}

1101

1526

1102

1527

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

1103

1528

from the signal handler */

1106

1531

mc.simple_poll = avahi_simple_poll_new();

1107

1532

if(mc.simple_poll == NULL){

1108

1533

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

1109

exitcode = EXIT_FAILURE;

1534

exitcode = EX_UNAVAILABLE;

1110

1535

goto end;

1111

1536

}

1112

1537

1113

1538

sigemptyset(&sigterm_action.sa_mask);

1114

1539

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

1115

1540

if(ret == -1){

1116

perror("sigaddset");

1117

exitcode = EXIT_FAILURE;

1541

perror_plus("sigaddset");

1542

exitcode = EX_OSERR;

1118

1543

goto end;

1119

1544

}

1120

1545

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

1121

1546

if(ret == -1){

1122

perror("sigaddset");

1123

exitcode = EXIT_FAILURE;

1547

perror_plus("sigaddset");

1548

exitcode = EX_OSERR;

1124

1549

goto end;

1125

1550

}

1126

1551

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

1127

1552

if(ret == -1){

1128

perror("sigaddset");

1129

exitcode = EXIT_FAILURE;

1553

perror_plus("sigaddset");

1554

exitcode = EX_OSERR;

1130

1555

goto end;

1131

1556

}

1132

1557

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

1135

1560

*/

1136

1561

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

1137

1562

if(ret == -1){

1138

perror("sigaction");

1139

return EXIT_FAILURE;

1563

perror_plus("sigaction");

1564

return EX_OSERR;

1140

1565

}

1141

1566

if(old_sigterm_action.sa_handler != SIG_IGN){

1142

1567

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

1143

1568

if(ret == -1){

1144

perror("sigaction");

1145

exitcode = EXIT_FAILURE;

1569

perror_plus("sigaction");

1570

exitcode = EX_OSERR;

1146

1571

goto end;

1147

1572

}

1148

1573

}

1149

1574

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

1150

1575

if(ret == -1){

1151

perror("sigaction");

1152

return EXIT_FAILURE;

1576

perror_plus("sigaction");

1577

return EX_OSERR;

1153

1578

}

1154

1579

if(old_sigterm_action.sa_handler != SIG_IGN){

1155

1580

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

1156

1581

if(ret == -1){

1157

perror("sigaction");

1158

exitcode = EXIT_FAILURE;

1582

perror_plus("sigaction");

1583

exitcode = EX_OSERR;

1159

1584

goto end;

1160

1585

}

1161

1586

}

1162

1587

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

1163

1588

if(ret == -1){

1164

perror("sigaction");

1165

return EXIT_FAILURE;

1589

perror_plus("sigaction");

1590

return EX_OSERR;

1166

1591

}

1167

1592

if(old_sigterm_action.sa_handler != SIG_IGN){

1168

1593

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

1169

1594

if(ret == -1){

1170

perror("sigaction");

1171

exitcode = EXIT_FAILURE;

1595

perror_plus("sigaction");

1596

exitcode = EX_OSERR;

1172

1597

goto end;

1173

1598

}

1174

1599

}

1175

1600

1176

1601

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

1177

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

1602

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

1178

1603

if_index = (AvahiIfIndex) if_nametoindex(interface);

1179

1604

if(if_index == 0){

1180

1605

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

1181

exitcode = EXIT_FAILURE;

1606

exitcode = EX_UNAVAILABLE;

1182

1607

goto end;

1183

1608

}

1184

1609

1186

1611

goto end;

1187

1612

}

1188

1613

1614

/* Re-raise priviliges */

1615

errno = 0;

1616

ret = seteuid(0);

1617

if(ret == -1){

1618

perror_plus("seteuid");

1619

}

1620

1189

1621

#ifdef __linux__

1190

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1191

messages to mess up the prompt */

1623

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

1192

1624

ret = klogctl(8, NULL, 5);

1193

1625

bool restore_loglevel = true;

1194

1626

if(ret == -1){

1195

1627

restore_loglevel = false;

1196

perror("klogctl");

1628

perror_plus("klogctl");

1197

1629

}

1198

1630

#endif /* __linux__ */

1199

1631

1200

1632

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1201

1633

if(sd < 0){

1202

perror("socket");

1203

exitcode = EXIT_FAILURE;

1634

perror_plus("socket");

1635

exitcode = EX_OSERR;

1204

1636

#ifdef __linux__

1205

1637

if(restore_loglevel){

1206

1638

ret = klogctl(7, NULL, 0);

1207

1639

if(ret == -1){

1208

perror("klogctl");

1640

perror_plus("klogctl");

1209

1641

}

1210

1642

}

1211

1643

#endif /* __linux__ */

1644

/* Lower privileges */

1645

errno = 0;

1646

ret = seteuid(uid);

1647

if(ret == -1){

1648

perror_plus("seteuid");

1649

}

1212

1650

goto end;

1213

1651

}

1214

1652

strcpy(network.ifr_name, interface);

1215

1653

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

1216

1654

if(ret == -1){

1217

perror("ioctl SIOCGIFFLAGS");

1655

perror_plus("ioctl SIOCGIFFLAGS");

1218

1656

#ifdef __linux__

1219

1657

if(restore_loglevel){

1220

1658

ret = klogctl(7, NULL, 0);

1221

1659

if(ret == -1){

1222

perror("klogctl");

1660

perror_plus("klogctl");

1223

1661

}

1224

1662

}

1225

1663

#endif /* __linux__ */

1226

exitcode = EXIT_FAILURE;

1664

exitcode = EX_OSERR;

1665

/* Lower privileges */

1666

errno = 0;

1667

ret = seteuid(uid);

1668

if(ret == -1){

1669

perror_plus("seteuid");

1670

}

1227

1671

goto end;

1228

1672

}

1229

1673

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

1232

1676

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

1233

1677

if(ret == -1){

1234

1678

take_down_interface = false;

1235

perror("ioctl SIOCSIFFLAGS");

1236

exitcode = EXIT_FAILURE;

1679

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1680

exitcode = EX_OSERR;

1237

1681

#ifdef __linux__

1238

1682

if(restore_loglevel){

1239

1683

ret = klogctl(7, NULL, 0);

1240

1684

if(ret == -1){

1241

perror("klogctl");

1685

perror_plus("klogctl");

1242

1686

}

1243

1687

}

1244

1688

#endif /* __linux__ */

1689

/* Lower privileges */

1690

errno = 0;

1691

ret = seteuid(uid);

1692

if(ret == -1){

1693

perror_plus("seteuid");

1694

}

1245

1695

goto end;

1246

1696

}

1247

1697

}

1248

/* sleep checking until interface is running */

1698

/* Sleep checking until interface is running.

1699

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

1249

1700

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

1250

1701

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

1251

1702

if(ret == -1){

1252

perror("ioctl SIOCGIFFLAGS");

1703

perror_plus("ioctl SIOCGIFFLAGS");

1253

1704

} else if(network.ifr_flags & IFF_RUNNING){

1254

1705

break;

1255

1706

}

1256

1707

struct timespec sleeptime = { .tv_nsec = 250000000 };

1257

1708

ret = nanosleep(&sleeptime, NULL);

1258

1709

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

1259

perror("nanosleep");

1710

perror_plus("nanosleep");

1260

1711

}

1261

1712

}

1262

1713

if(not take_down_interface){

1263

1714

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

1264

1715

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

1265

1716

if(ret == -1){

1266

perror("close");

1717

perror_plus("close");

1267

1718

}

1268

1719

}

1269

1720

#ifdef __linux__

1271

1722

/* Restores kernel loglevel to default */

1272

1723

ret = klogctl(7, NULL, 0);

1273

1724

if(ret == -1){

1274

perror("klogctl");

1725

perror_plus("klogctl");

1275

1726

}

1276

1727

}

1277

1728

#endif /* __linux__ */

1278

}

1279

1280

if(quit_now){

1281

goto end;

1282

}

1283

1284

uid = getuid();

1285

gid = getgid();

1286

1287

errno = 0;

1288

setgid(gid);

1289

if(ret == -1){

1290

perror("setgid");

1291

}

1292

1293

ret = setuid(uid);

1294

if(ret == -1){

1295

perror("setuid");

1729

/* Lower privileges */

1730

errno = 0;

1731

if(take_down_interface){

1732

/* Lower privileges */

1733

ret = seteuid(uid);

1734

if(ret == -1){

1735

perror_plus("seteuid");

1736

}

1737

} else {

1738

/* Lower privileges permanently */

1739

ret = setuid(uid);

1740

if(ret == -1){

1741

perror_plus("setuid");

1742

}

1743

}

1296

1744

}

1297

1745

1298

1746

if(quit_now){

1302

1750

ret = init_gnutls_global(pubkey, seckey);

1303

1751

if(ret == -1){

1304

1752

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

1305

exitcode = EXIT_FAILURE;

1753

exitcode = EX_UNAVAILABLE;

1306

1754

goto end;

1307

1755

} else {

1308

1756

gnutls_initialized = true;

1312

1760

goto end;

1313

1761

}

1314

1762

1763

if(mkdtemp(tempdir) == NULL){

1764

perror_plus("mkdtemp");

1765

goto end;

1766

}

1315

1767

tempdir_created = true;

1316

if(mkdtemp(tempdir) == NULL){

1317

tempdir_created = false;

1318

perror("mkdtemp");

1319

goto end;

1320

}

1321

1768

1322

1769

if(quit_now){

1323

1770

goto end;

1325

1772

1326

1773

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

1327

1774

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

1328

exitcode = EXIT_FAILURE;

1775

exitcode = EX_UNAVAILABLE;

1329

1776

goto end;

1330

1777

} else {

1331

1778

gpgme_initialized = true;

1341

1788

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

1342

1789

if(address == NULL){

1343

1790

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

1344

exitcode = EXIT_FAILURE;

1791

exitcode = EX_USAGE;

1345

1792

goto end;

1346

1793

}

1347

1794

1355

1802

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

1356

1803

or tmpmax != (uint16_t)tmpmax){

1357

1804

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

1358

exitcode = EXIT_FAILURE;

1805

exitcode = EX_USAGE;

1359

1806

goto end;

1360

1807

}

1361

1808

1365

1812

1366

1813

port = (uint16_t)tmpmax;

1367

1814

*address = '\0';

1368

address = connect_to;

1369

1815

/* Colon in address indicates IPv6 */

1370

1816

int af;

1371

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

1817

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

1372

1818

af = AF_INET6;

1819

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

1820

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

1821

{

1822

connect_to++;

1823

address[-1] = '\0';

1824

}

1373

1825

} else {

1374

1826

af = AF_INET;

1375

1827

}

1828

address = connect_to;

1376

1829

1377

1830

if(quit_now){

1378

1831

goto end;

1379

1832

}

1380

1833

1381

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

1382

if(ret < 0){

1383

exitcode = EXIT_FAILURE;

1384

} else {

1834

while(not quit_now){

1835

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

1836

if(quit_now or ret == 0){

1837

break;

1838

}

1839

if(debug){

1840

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

1841

(int)retry_interval);

1842

}

1843

sleep((int)retry_interval);

1844

}

1845

1846

if (not quit_now){

1385

1847

exitcode = EXIT_SUCCESS;

1386

1848

}

1849

1387

1850

goto end;

1388

1851

}

1389

1852

1413

1876

if(mc.server == NULL){

1414

1877

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

1415

1878

avahi_strerror(error));

1416

exitcode = EXIT_FAILURE;

1879

exitcode = EX_UNAVAILABLE;

1417

1880

goto end;

1418

1881

}

1419

1882

1428

1891

if(sb == NULL){

1429

1892

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

1430

1893

avahi_strerror(avahi_server_errno(mc.server)));

1431

exitcode = EXIT_FAILURE;

1894

exitcode = EX_UNAVAILABLE;

1432

1895

goto end;

1433

1896

}

1434

1897

1441

1904

if(debug){

1442

1905

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

1443

1906

}

1444

1445

avahi_simple_poll_loop(mc.simple_poll);

1907

1908

ret = avahi_loop_with_timeout(mc.simple_poll,

1909

(int)(retry_interval * 1000));

1910

if(debug){

1911

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

1912

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

1913

}

1446

1914

1447

1915

end:

1448

1916

1469

1937

if(gpgme_initialized){

1470

1938

gpgme_release(mc.ctx);

1471

1939

}

1940

1941

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

1942

has seen */

1943

if(mc.current_server != NULL){

1944

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

1945

while(mc.current_server != NULL){

1946

server *next = mc.current_server->next;

1947

free(mc.current_server);

1948

mc.current_server = next;

1949

}

1950

}

1472

1951

1473

1952

/* Take down the network interface */

1474

1953

if(take_down_interface){

1475

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

1954

/* Re-raise priviliges */

1955

errno = 0;

1956

ret = seteuid(0);

1476

1957

if(ret == -1){

1477

perror("ioctl SIOCGIFFLAGS");

1478

} else if(network.ifr_flags & IFF_UP) {

1479

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

1480

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

1481

if(ret == -1){

1482

perror("ioctl SIOCSIFFLAGS");

1483

}

1958

perror_plus("seteuid");

1484

1959

}

1485

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

1486

if(ret == -1){

1487

perror("close");

1960

if(geteuid() == 0){

1961

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

1962

if(ret == -1){

1963

perror_plus("ioctl SIOCGIFFLAGS");

1964

} else if(network.ifr_flags & IFF_UP) {

1965

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

1966

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

1967

if(ret == -1){

1968

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1969

}

1970

}

1971

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

1972

if(ret == -1){

1973

perror_plus("close");

1974

}

1975

/* Lower privileges permanently */

1976

errno = 0;

1977

ret = setuid(uid);

1978

if(ret == -1){

1979

perror_plus("setuid");

1980

}

1488

1981

}

1489

1982

}

1490

1983

1491

/* Removes the temp directory used by GPGME */

1984

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

1492

1985

if(tempdir_created){

1493

DIR *d;

1494

struct dirent *direntry;

1495

d = opendir(tempdir);

1496

if(d == NULL){

1497

if(errno != ENOENT){

1498

perror("opendir");

1499

}

1500

} else {

1501

while(true){

1502

direntry = readdir(d);

1503

if(direntry == NULL){

1504

break;

1505

}

1506

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

1507

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

1508

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

1509

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

1510

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

1511

continue;

1512

}

1986

struct dirent **direntries = NULL;

1987

struct dirent *direntry = NULL;

1988

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

1989

alphasort);

1990

if (numentries > 0){

1991

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

1992

direntry = direntries[i];

1513

1993

char *fullname = NULL;

1514

1994

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

1515

1995

direntry->d_name);

1516

1996

if(ret < 0){

1517

perror("asprintf");

1997

perror_plus("asprintf");

1518

1998

continue;

1519

1999

}

1520

2000

ret = remove(fullname);

1524

2004

}

1525

2005

free(fullname);

1526

2006

}

1527

closedir(d);

2007

}

2008

2009

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

2010

free(direntries);

2011

if (numentries == -1){

2012

perror_plus("scandir");

1528

2013

}

1529

2014

ret = rmdir(tempdir);

1530

2015

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

1531

perror("rmdir");

2016

perror_plus("rmdir");

1532

2017

}

1533

2018

}

1534

2019

1535

2020

if(quit_now){

1536

2021

sigemptyset(&old_sigterm_action.sa_mask);

1537

2022

old_sigterm_action.sa_handler = SIG_DFL;

1538

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

2023

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2024

&old_sigterm_action,

2025

NULL));

1539

2026

if(ret == -1){

1540

perror("sigaction");

1541

}

1542

raise(signal_received);

2027

perror_plus("sigaction");

2028

}

2029

do {

2030

ret = raise(signal_received);

2031

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

2032

if(ret != 0){

2033

perror_plus("raise");

2034

abort();

2035

}

2036

TEMP_FAILURE_RETRY(pause());

1543

2037

}

1544

2038

1545

2039

return exitcode;