/mandos/release : revision 237.2.127

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@recompile.se>.

29

* Contact the authors at <mandos@fukt.bsnet.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, srand(),

47

strtof(), abort() */

46

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

47

srand(), strtof() */

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

program_invocation_short_name */

67

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

65

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

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

70

69

if_nametoindex(), IF_NAMESIZE */

72

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

73

72

*/

74

73

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

75

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

76

setgid(), pause() */

77

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

74

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

75

setgid() */

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

83

82

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

84

83

sigaction(), SIGTERM, sig_atomic_t,

85

84

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

85

89

86

#ifdef __linux__

90

87

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

127

124

bool debug = false;

128

125

static const char mandos_protocol_version[] = "1";

129

126

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

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;

127

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

144

128

145

129

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

146

130

typedef struct {

151

135

gnutls_dh_params_t dh_params;

152

136

const char *priority;

153

137

gpgme_ctx_t ctx;

154

server *current_server;

155

138

} mandos_context;

156

139

157

140

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

158

141

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

159

142

.dh_bits = 1024, .priority = "SECURE256"

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

}

143

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

172

144

173

145

/*

174

146

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

187

159

return buffer_capacity;

188

160

}

189

161

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

228

162

/*

229

163

* Initialize GPGME.

230

164

*/

244

178

245

179

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

246

180

if(fd == -1){

247

perror_plus("open");

181

perror("open");

248

182

return false;

249

183

}

250

184

264

198

265

199

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

266

200

if(ret == -1){

267

perror_plus("close");

201

perror("close");

268

202

}

269

203

gpgme_data_release(pgp_data);

270

204

return true;

283

217

return false;

284

218

}

285

219

286

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

220

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

287

221

rc = gpgme_get_engine_info(&engine_info);

288

222

if(rc != GPG_ERR_NO_ERROR){

289

223

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

395

329

396

330

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

397

331

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

398

perror_plus("gpgme_data_seek");

332

perror("gpgme_data_seek");

399

333

plaintext_length = -1;

400

334

goto decrypt_end;

401

335

}

406

340

(size_t)plaintext_length,

407

341

plaintext_capacity);

408

342

if(plaintext_capacity == 0){

409

perror_plus("incbuffer");

343

perror("incbuffer");

410

344

plaintext_length = -1;

411

345

goto decrypt_end;

412

346

}

419

353

break;

420

354

}

421

355

if(ret < 0){

422

perror_plus("gpgme_data_read");

356

perror("gpgme_data_read");

423

357

plaintext_length = -1;

424

358

goto decrypt_end;

425

359

}

482

416

}

483

417

484

418

/* OpenPGP credentials */

485

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

486

420

if(ret != GNUTLS_E_SUCCESS){

487

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

421

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

422

from

423

-Wunreachable-code

424

*/

488

425

safer_gnutls_strerror(ret));

489

426

gnutls_global_deinit();

490

427

return -1;

537

474

static int init_gnutls_session(gnutls_session_t *session){

538

475

int ret;

539

476

/* GnuTLS session creation */

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);

477

ret = gnutls_init(session, GNUTLS_SERVER);

546

478

if(ret != GNUTLS_E_SUCCESS){

547

479

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

548

480

safer_gnutls_strerror(ret));

550

482

551

483

{

552

484

const char *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);

485

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

560

486

if(ret != GNUTLS_E_SUCCESS){

561

487

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

562

488

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

566

492

}

567

493

}

568

494

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);

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

577

497

if(ret != GNUTLS_E_SUCCESS){

578

498

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

579

499

safer_gnutls_strerror(ret));

582

502

}

583

503

584

504

/* ignore client certificate if any. */

585

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

586

507

587

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

588

509

593

514

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

594

515

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

595

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

596

520

/* Called when a Mandos server is found */

597

521

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

598

522

AvahiIfIndex if_index,

604

528

struct sockaddr_in6 in6;

605

529

} to;

606

530

char *buffer = NULL;

607

char *decrypted_buffer = NULL;

531

char *decrypted_buffer;

608

532

size_t buffer_length = 0;

609

533

size_t buffer_capacity = 0;

610

534

size_t written;

611

int retval = -1;

535

int retval = 0;

612

536

gnutls_session_t session;

613

537

int pf; /* Protocol family */

614

538

615

errno = 0;

616

617

539

if(quit_now){

618

errno = EINTR;

619

540

return -1;

620

541

}

621

542

628

549

break;

629

550

default:

630

551

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

631

errno = EINVAL;

632

552

return -1;

633

553

}

634

554

644

564

645

565

tcp_sd = socket(pf, SOCK_STREAM, 0);

646

566

if(tcp_sd < 0){

647

int e = errno;

648

perror_plus("socket");

649

errno = e;

567

perror("socket");

568

retval = -1;

650

569

goto mandos_end;

651

570

}

652

571

653

572

if(quit_now){

654

errno = EINTR;

655

573

goto mandos_end;

656

574

}

657

575

664

582

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

665

583

}

666

584

if(ret < 0 ){

667

int e = errno;

668

perror_plus("inet_pton");

669

errno = e;

585

perror("inet_pton");

586

retval = -1;

670

587

goto mandos_end;

671

588

}

672

589

if(ret == 0){

673

int e = errno;

674

590

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

675

errno = e;

591

retval = -1;

676

592

goto mandos_end;

677

593

}

678

594

if(af == AF_INET6){

686

602

if(if_index == AVAHI_IF_UNSPEC){

687

603

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

688

604

" without a network interface\n");

689

errno = EINVAL;

605

retval = -1;

690

606

goto mandos_end;

691

607

}

692

608

/* Set the network interface number as scope */

699

615

}

700

616

701

617

if(quit_now){

702

errno = EINTR;

703

618

goto mandos_end;

704

619

}

705

620

707

622

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

708

623

char interface[IF_NAMESIZE];

709

624

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

710

perror_plus("if_indextoname");

625

perror("if_indextoname");

711

626

} else {

712

627

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

713

628

ip, interface, port);

727

642

sizeof(addrstr));

728

643

}

729

644

if(pcret == NULL){

730

perror_plus("inet_ntop");

645

perror("inet_ntop");

731

646

} else {

732

647

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

733

648

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

736

651

}

737

652

738

653

if(quit_now){

739

errno = EINTR;

740

654

goto mandos_end;

741

655

}

742

656

746

660

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

747

661

}

748

662

if(ret < 0){

749

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

750

int e = errno;

751

perror_plus("connect");

752

errno = e;

753

}

663

perror("connect");

664

retval = -1;

754

665

goto mandos_end;

755

666

}

756

667

757

668

if(quit_now){

758

errno = EINTR;

759

669

goto mandos_end;

760

670

}

761

671

766

676

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

767

677

out_size - written));

768

678

if(ret == -1){

769

int e = errno;

770

perror_plus("write");

771

errno = e;

679

perror("write");

680

retval = -1;

772

681

goto mandos_end;

773

682

}

774

683

written += (size_t)ret;

784

693

}

785

694

786

695

if(quit_now){

787

errno = EINTR;

788

696

goto mandos_end;

789

697

}

790

698

}

794

702

}

795

703

796

704

if(quit_now){

797

errno = EINTR;

798

705

goto mandos_end;

799

706

}

800

707

801

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

802

708

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

803

709

804

710

if(quit_now){

805

errno = EINTR;

806

711

goto mandos_end;

807

712

}

808

713

809

714

do {

810

715

ret = gnutls_handshake(session);

811

716

if(quit_now){

812

errno = EINTR;

813

717

goto mandos_end;

814

718

}

815

719

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

819

723

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

820

724

gnutls_perror(ret);

821

725

}

822

errno = EPROTO;

726

retval = -1;

823

727

goto mandos_end;

824

728

}

825

729

833

737

while(true){

834

738

835

739

if(quit_now){

836

errno = EINTR;

837

740

goto mandos_end;

838

741

}

839

742

840

743

buffer_capacity = incbuffer(&buffer, buffer_length,

841

744

buffer_capacity);

842

745

if(buffer_capacity == 0){

843

int e = errno;

844

perror_plus("incbuffer");

845

errno = e;

746

perror("incbuffer");

747

retval = -1;

846

748

goto mandos_end;

847

749

}

848

750

849

751

if(quit_now){

850

errno = EINTR;

851

752

goto mandos_end;

852

753

}

853

754

866

767

ret = gnutls_handshake(session);

867

768

868

769

if(quit_now){

869

errno = EINTR;

870

770

goto mandos_end;

871

771

}

872

772

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

873

773

if(ret < 0){

874

774

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

875

775

gnutls_perror(ret);

876

errno = EPROTO;

776

retval = -1;

877

777

goto mandos_end;

878

778

}

879

779

break;

880

780

default:

881

781

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

882

782

" encrypted session with Mandos server\n");

783

retval = -1;

883

784

gnutls_bye(session, GNUTLS_SHUT_RDWR);

884

errno = EIO;

885

785

goto mandos_end;

886

786

}

887

787

} else {

894

794

}

895

795

896

796

if(quit_now){

897

errno = EINTR;

898

goto mandos_end;

899

}

900

901

do {

902

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

903

if(quit_now){

904

errno = EINTR;

905

goto mandos_end;

906

}

907

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

797

goto mandos_end;

798

}

799

800

gnutls_bye(session, GNUTLS_SHUT_RDWR);

801

802

if(quit_now){

803

goto mandos_end;

804

}

908

805

909

806

if(buffer_length > 0){

910

807

ssize_t decrypted_buffer_size;

916

813

written = 0;

917

814

while(written < (size_t) decrypted_buffer_size){

918

815

if(quit_now){

919

errno = EINTR;

920

816

goto mandos_end;

921

817

}

922

818

924

820

(size_t)decrypted_buffer_size - written,

925

821

stdout);

926

822

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

927

int e = errno;

928

823

if(debug){

929

824

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

930

825

strerror(errno));

931

826

}

932

errno = e;

933

goto mandos_end;

827

retval = -1;

828

break;

934

829

}

935

830

written += (size_t)ret;

936

831

}

937

retval = 0;

832

free(decrypted_buffer);

833

} else {

834

retval = -1;

938

835

}

836

} else {

837

retval = -1;

939

838

}

940

839

941

840

/* Shutdown procedure */

942

841

943

842

mandos_end:

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

}

843

free(buffer);

844

if(tcp_sd >= 0){

845

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

846

}

847

if(ret == -1){

848

perror("close");

849

}

850

gnutls_deinit(session);

851

if(quit_now){

852

retval = -1;

963

853

}

964

854

return retval;

965

855

}

1008

898

avahi_proto_to_af(proto));

1009

899

if(ret == 0){

1010

900

avahi_simple_poll_quit(mc.simple_poll);

1011

} else {

1012

ret = add_server(ip, port, interface,

1013

avahi_proto_to_af(proto));

1014

901

}

1015

902

}

1016

903

}

1070

957

}

1071

958

}

1072

959

1073

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

960

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

1074

961

static void handle_sigterm(int sig){

1075

962

if(quit_now){

1076

963

return;

1078

965

quit_now = 1;

1079

966

signal_received = sig;

1080

967

int old_errno = errno;

1081

/* set main loop to exit */

1082

968

if(mc.simple_poll != NULL){

1083

969

avahi_simple_poll_quit(mc.simple_poll);

1084

970

}

1085

971

errno = old_errno;

1086

972

}

1087

973

1088

/*

1089

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

1090

* corresponds to an acceptable network device.

1091

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

1092

*/

1093

int good_interface(const struct dirent *if_entry){

1094

ssize_t ssret;

1095

char *flagname = NULL;

1096

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

1097

return 0;

1098

}

1099

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

1100

if_entry->d_name);

1101

if(ret < 0){

1102

perror_plus("asprintf");

1103

return 0;

1104

}

1105

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

1106

if(flags_fd == -1){

1107

perror_plus("open");

1108

free(flagname);

1109

return 0;

1110

}

1111

free(flagname);

1112

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

1113

/* read line from flags_fd */

1114

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

1115

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

1116

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

1117

if(flagstring == NULL){

1118

perror_plus("malloc");

1119

close(flags_fd);

1120

return 0;

1121

}

1122

while(to_read > 0){

1123

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

1124

(size_t)to_read));

1125

if(ssret == -1){

1126

perror_plus("read");

1127

free(flagstring);

1128

close(flags_fd);

1129

return 0;

1130

}

1131

to_read -= ssret;

1132

if(ssret == 0){

1133

break;

1134

}

1135

}

1136

close(flags_fd);

1137

intmax_t tmpmax;

1138

char *tmp;

1139

errno = 0;

1140

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

1141

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

1142

and not (isspace(*tmp)))

1143

or tmpmax != (ifreq_flags)tmpmax){

1144

if(debug){

1145

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

1146

flagstring, if_entry->d_name);

1147

}

1148

free(flagstring);

1149

return 0;

1150

}

1151

free(flagstring);

1152

ifreq_flags flags = (ifreq_flags)tmpmax;

1153

/* Reject the loopback device */

1154

if(flags & IFF_LOOPBACK){

1155

if(debug){

1156

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

1157

if_entry->d_name);

1158

}

1159

return 0;

1160

}

1161

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

1162

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

1163

if(debug){

1164

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

1165

if_entry->d_name);

1166

}

1167

return 1;

1168

}

1169

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

1170

if(not (flags & IFF_BROADCAST)){

1171

if(debug){

1172

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

1173

if_entry->d_name);

1174

}

1175

return 0;

1176

}

1177

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

1178

if(flags & IFF_NOARP){

1179

if(debug){

1180

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

1181

if_entry->d_name);

1182

}

1183

return 0;

1184

}

1185

/* Accept this device */

1186

if(debug){

1187

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

1188

if_entry->d_name);

1189

}

1190

return 1;

1191

}

1192

1193

int notdotentries(const struct dirent *direntry){

1194

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

1195

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

1196

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

1197

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

1198

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

1199

return 0;

1200

}

1201

return 1;

1202

}

1203

1204

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1205

int ret;

1206

struct timespec now;

1207

struct timespec waited_time;

1208

intmax_t block_time;

1209

1210

while(true){

1211

if(mc.current_server == NULL){

1212

if (debug){

1213

fprintf(stderr,

1214

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

1215

}

1216

ret = avahi_simple_poll_iterate(s, -1);

1217

} else {

1218

if (debug){

1219

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

1220

" or wait\n");

1221

}

1222

/* the current time */

1223

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1224

if(ret == -1){

1225

perror_plus("clock_gettime");

1226

return -1;

1227

}

1228

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

1229

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

1230

waited_time.tv_sec = (now.tv_sec

1231

- mc.current_server->last_seen.tv_sec);

1232

waited_time.tv_nsec = (now.tv_nsec

1233

- mc.current_server->last_seen.tv_nsec);

1234

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

1235

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

1236

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

1237

block_time = ((retry_interval

1238

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

1239

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

1240

1241

if (debug){

1242

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

1243

}

1244

1245

if(block_time <= 0){

1246

ret = start_mandos_communication(mc.current_server->ip,

1247

mc.current_server->port,

1248

mc.current_server->if_index,

1249

mc.current_server->af);

1250

if(ret == 0){

1251

avahi_simple_poll_quit(mc.simple_poll);

1252

return 0;

1253

}

1254

ret = clock_gettime(CLOCK_MONOTONIC,

1255

&mc.current_server->last_seen);

1256

if(ret == -1){

1257

perror_plus("clock_gettime");

1258

return -1;

1259

}

1260

mc.current_server = mc.current_server->next;

1261

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

1262

servers, but don't block */

1263

}

1264

1265

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

1266

}

1267

if(ret != 0){

1268

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

1269

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

1270

}

1271

}

1272

}

1273

}

1274

1275

974

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

1276

975

AvahiSServiceBrowser *sb = NULL;

1277

976

int error;

1279

978

intmax_t tmpmax;

1280

979

char *tmp;

1281

980

int exitcode = EXIT_SUCCESS;

1282

const char *interface = "";

981

const char *interface = "eth0";

1283

982

struct ifreq network;

1284

983

int sd = -1;

1285

984

bool take_down_interface = false;

1286

985

uid_t uid;

1287

986

gid_t gid;

987

char *connect_to = NULL;

1288

988

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

1289

989

bool tempdir_created = false;

1290

990

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1294

994

bool gnutls_initialized = false;

1295

995

bool gpgme_initialized = false;

1296

996

float delay = 2.5f;

1297

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

1298

retrying the same server again */

1299

997

1300

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

struct sigaction old_sigterm_action;

1301

999

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1302

1000

1303

uid = getuid();

1304

gid = getgid();

1305

1306

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

1307

errno = 0;

1308

ret = setgid(gid);

1309

if(ret == -1){

1310

perror_plus("setgid");

1311

}

1312

1313

/* Lower user privileges (temporarily) */

1314

errno = 0;

1315

ret = seteuid(uid);

1316

if(ret == -1){

1317

perror_plus("seteuid");

1318

}

1319

1320

if(quit_now){

1321

goto end;

1322

}

1323

1324

1001

{

1325

1002

struct argp_option options[] = {

1326

1003

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

1355

1032

.arg = "SECONDS",

1356

1033

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

1357

1034

.group = 2 },

1358

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

1359

.arg = "SECONDS",

1360

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

1361

.group = 2 },

1362

/*

1363

* These reproduce what we would get without ARGP_NO_HELP

1364

*/

1365

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

1366

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

1367

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

1368

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

1369

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

1370

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

1371

1035

{ .name = NULL }

1372

1036

};

1373

1037

1374

1038

error_t parse_opt(int key, char *arg,

1375

1039

struct argp_state *state){

1376

errno = 0;

1377

1040

switch(key){

1378

1041

case 128: /* --debug */

1379

1042

debug = true;

1395

1058

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

1396

1059

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

1397

1060

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

1398

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

1061

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

1062

exit(EXIT_FAILURE);

1399

1063

}

1400

1064

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

1401

1065

break;

1406

1070

errno = 0;

1407

1071

delay = strtof(arg, &tmp);

1408

1072

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

1409

argp_error(state, "Bad delay");

1410

}

1411

case 132: /* --retry */

1412

errno = 0;

1413

retry_interval = strtod(arg, &tmp);

1414

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

1415

or (retry_interval * 1000) > INT_MAX

1416

or retry_interval < 0){

1417

argp_error(state, "Bad retry interval");

1073

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

1074

exit(EXIT_FAILURE);

1418

1075

}

1419

1076

break;

1420

/*

1421

* These reproduce what we would get without ARGP_NO_HELP

1422

*/

1423

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

1424

argp_state_help(state, state->out_stream,

1425

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1426

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1427

case -3: /* --usage */

1428

argp_state_help(state, state->out_stream,

1429

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1430

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

1431

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

1432

exit(argp_err_exit_status);

1077

case ARGP_KEY_ARG:

1078

argp_usage(state);

1079

case ARGP_KEY_END:

1433

1080

break;

1434

1081

default:

1435

1082

return ARGP_ERR_UNKNOWN;

1436

1083

}

1437

return errno;

1084

return 0;

1438

1085

}

1439

1086

1440

1087

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

1441

1088

.args_doc = "",

1442

1089

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

1443

1090

" passwords from a Mandos server" };

1444

ret = argp_parse(&argp, argc, argv,

1445

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1446

switch(ret){

1447

case 0:

1448

break;

1449

case ENOMEM:

1450

default:

1451

errno = ret;

1452

perror_plus("argp_parse");

1453

exitcode = EX_OSERR;

1454

goto end;

1455

case EINVAL:

1456

exitcode = EX_USAGE;

1457

goto end;

1458

}

1459

}

1460

1461

{

1462

/* Work around Debian bug #633582:

1463

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

1464

struct stat st;

1465

1466

/* Re-raise priviliges */

1467

errno = 0;

1468

ret = seteuid(0);

1469

if(ret == -1){

1470

perror_plus("seteuid");

1471

}

1472

1473

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

1474

int seckey_fd = open(seckey, O_RDONLY);

1475

if(seckey_fd == -1){

1476

perror_plus("open");

1477

} else {

1478

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

1479

if(ret == -1){

1480

perror_plus("fstat");

1481

} else {

1482

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

1483

ret = fchown(seckey_fd, uid, gid);

1484

if(ret == -1){

1485

perror_plus("fchown");

1486

}

1487

}

1488

}

1489

TEMP_FAILURE_RETRY(close(seckey_fd));

1490

}

1491

}

1492

1493

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

1494

int pubkey_fd = open(pubkey, O_RDONLY);

1495

if(pubkey_fd == -1){

1496

perror_plus("open");

1497

} else {

1498

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

1499

if(ret == -1){

1500

perror_plus("fstat");

1501

} else {

1502

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

1503

ret = fchown(pubkey_fd, uid, gid);

1504

if(ret == -1){

1505

perror_plus("fchown");

1506

}

1507

}

1508

}

1509

TEMP_FAILURE_RETRY(close(pubkey_fd));

1510

}

1511

}

1512

1513

/* Lower privileges */

1514

errno = 0;

1515

ret = seteuid(uid);

1516

if(ret == -1){

1517

perror_plus("seteuid");

1091

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

1092

if(ret == ARGP_ERR_UNKNOWN){

1093

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

1094

exitcode = EXIT_FAILURE;

1095

goto end;

1518

1096

}

1519

1097

}

1520

1098

1521

1099

if(not debug){

1522

1100

avahi_set_log_function(empty_log);

1523

1101

}

1524

1525

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

1526

struct dirent **direntries;

1527

ret = scandir(sys_class_net, &direntries, good_interface,

1528

alphasort);

1529

if(ret >= 1){

1530

/* Pick the first good interface */

1531

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

1532

if(debug){

1533

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

1534

}

1535

if(interface == NULL){

1536

perror_plus("malloc");

1537

free(direntries);

1538

exitcode = EXIT_FAILURE;

1539

goto end;

1540

}

1541

free(direntries);

1542

} else {

1543

free(direntries);

1544

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

1545

exitcode = EXIT_FAILURE;

1546

goto end;

1547

}

1548

}

1549

1102

1550

1103

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

1551

1104

from the signal handler */

1554

1107

mc.simple_poll = avahi_simple_poll_new();

1555

1108

if(mc.simple_poll == NULL){

1556

1109

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

1557

exitcode = EX_UNAVAILABLE;

1110

exitcode = EXIT_FAILURE;

1558

1111

goto end;

1559

1112

}

1560

1113

1561

1114

sigemptyset(&sigterm_action.sa_mask);

1562

1115

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

1563

1116

if(ret == -1){

1564

perror_plus("sigaddset");

1565

exitcode = EX_OSERR;

1117

perror("sigaddset");

1118

exitcode = EXIT_FAILURE;

1566

1119

goto end;

1567

1120

}

1568

1121

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

1569

1122

if(ret == -1){

1570

perror_plus("sigaddset");

1571

exitcode = EX_OSERR;

1123

perror("sigaddset");

1124

exitcode = EXIT_FAILURE;

1572

1125

goto end;

1573

1126

}

1574

1127

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

1575

1128

if(ret == -1){

1576

perror_plus("sigaddset");

1577

exitcode = EX_OSERR;

1129

perror("sigaddset");

1130

exitcode = EXIT_FAILURE;

1578

1131

goto end;

1579

1132

}

1580

1133

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

1583

1136

*/

1584

1137

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

1585

1138

if(ret == -1){

1586

perror_plus("sigaction");

1587

return EX_OSERR;

1139

perror("sigaction");

1140

return EXIT_FAILURE;

1588

1141

}

1589

1142

if(old_sigterm_action.sa_handler != SIG_IGN){

1590

1143

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

1591

1144

if(ret == -1){

1592

perror_plus("sigaction");

1593

exitcode = EX_OSERR;

1145

perror("sigaction");

1146

exitcode = EXIT_FAILURE;

1594

1147

goto end;

1595

1148

}

1596

1149

}

1597

1150

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

1598

1151

if(ret == -1){

1599

perror_plus("sigaction");

1600

return EX_OSERR;

1152

perror("sigaction");

1153

return EXIT_FAILURE;

1601

1154

}

1602

1155

if(old_sigterm_action.sa_handler != SIG_IGN){

1603

1156

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

1604

1157

if(ret == -1){

1605

perror_plus("sigaction");

1606

exitcode = EX_OSERR;

1158

perror("sigaction");

1159

exitcode = EXIT_FAILURE;

1607

1160

goto end;

1608

1161

}

1609

1162

}

1610

1163

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

1611

1164

if(ret == -1){

1612

perror_plus("sigaction");

1613

return EX_OSERR;

1165

perror("sigaction");

1166

return EXIT_FAILURE;

1614

1167

}

1615

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1616

1169

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

1617

1170

if(ret == -1){

1618

perror_plus("sigaction");

1619

exitcode = EX_OSERR;

1171

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1620

1173

goto end;

1621

1174

}

1622

1175

}

1623

1176

1624

1177

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

1625

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

1178

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

1626

1179

if_index = (AvahiIfIndex) if_nametoindex(interface);

1627

1180

if(if_index == 0){

1628

1181

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

1629

exitcode = EX_UNAVAILABLE;

1182

exitcode = EXIT_FAILURE;

1630

1183

goto end;

1631

1184

}

1632

1185

1634

1187

goto end;

1635

1188

}

1636

1189

1637

/* Re-raise priviliges */

1638

errno = 0;

1639

ret = seteuid(0);

1640

if(ret == -1){

1641

perror_plus("seteuid");

1642

}

1643

1644

1190

#ifdef __linux__

1645

1191

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1646

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

1192

messages to mess up the prompt */

1647

1193

ret = klogctl(8, NULL, 5);

1648

1194

bool restore_loglevel = true;

1649

1195

if(ret == -1){

1650

1196

restore_loglevel = false;

1651

perror_plus("klogctl");

1197

perror("klogctl");

1652

1198

}

1653

1199

#endif /* __linux__ */

1654

1200

1655

1201

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1656

1202

if(sd < 0){

1657

perror_plus("socket");

1658

exitcode = EX_OSERR;

1203

perror("socket");

1204

exitcode = EXIT_FAILURE;

1659

1205

#ifdef __linux__

1660

1206

if(restore_loglevel){

1661

1207

ret = klogctl(7, NULL, 0);

1662

1208

if(ret == -1){

1663

perror_plus("klogctl");

1209

perror("klogctl");

1664

1210

}

1665

1211

}

1666

1212

#endif /* __linux__ */

1667

/* Lower privileges */

1668

errno = 0;

1669

ret = seteuid(uid);

1670

if(ret == -1){

1671

perror_plus("seteuid");

1672

}

1673

1213

goto end;

1674

1214

}

1675

1215

strcpy(network.ifr_name, interface);

1676

1216

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

1677

1217

if(ret == -1){

1678

perror_plus("ioctl SIOCGIFFLAGS");

1218

perror("ioctl SIOCGIFFLAGS");

1679

1219

#ifdef __linux__

1680

1220

if(restore_loglevel){

1681

1221

ret = klogctl(7, NULL, 0);

1682

1222

if(ret == -1){

1683

perror_plus("klogctl");

1223

perror("klogctl");

1684

1224

}

1685

1225

}

1686

1226

#endif /* __linux__ */

1687

exitcode = EX_OSERR;

1688

/* Lower privileges */

1689

errno = 0;

1690

ret = seteuid(uid);

1691

if(ret == -1){

1692

perror_plus("seteuid");

1693

}

1227

exitcode = EXIT_FAILURE;

1694

1228

goto end;

1695

1229

}

1696

1230

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

1699

1233

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

1700

1234

if(ret == -1){

1701

1235

take_down_interface = false;

1702

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1703

exitcode = EX_OSERR;

1236

perror("ioctl SIOCSIFFLAGS");

1237

exitcode = EXIT_FAILURE;

1704

1238

#ifdef __linux__

1705

1239

if(restore_loglevel){

1706

1240

ret = klogctl(7, NULL, 0);

1707

1241

if(ret == -1){

1708

perror_plus("klogctl");

1242

perror("klogctl");

1709

1243

}

1710

1244

}

1711

1245

#endif /* __linux__ */

1712

/* Lower privileges */

1713

errno = 0;

1714

ret = seteuid(uid);

1715

if(ret == -1){

1716

perror_plus("seteuid");

1717

}

1718

1246

goto end;

1719

1247

}

1720

1248

}

1721

/* Sleep checking until interface is running.

1722

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

1249

/* sleep checking until interface is running */

1723

1250

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

1724

1251

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

1725

1252

if(ret == -1){

1726

perror_plus("ioctl SIOCGIFFLAGS");

1253

perror("ioctl SIOCGIFFLAGS");

1727

1254

} else if(network.ifr_flags & IFF_RUNNING){

1728

1255

break;

1729

1256

}

1730

1257

struct timespec sleeptime = { .tv_nsec = 250000000 };

1731

1258

ret = nanosleep(&sleeptime, NULL);

1732

1259

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

1733

perror_plus("nanosleep");

1260

perror("nanosleep");

1734

1261

}

1735

1262

}

1736

1263

if(not take_down_interface){

1737

1264

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

1738

1265

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

1739

1266

if(ret == -1){

1740

perror_plus("close");

1267

perror("close");

1741

1268

}

1742

1269

}

1743

1270

#ifdef __linux__

1745

1272

/* Restores kernel loglevel to default */

1746

1273

ret = klogctl(7, NULL, 0);

1747

1274

if(ret == -1){

1748

perror_plus("klogctl");

1275

perror("klogctl");

1749

1276

}

1750

1277

}

1751

1278

#endif /* __linux__ */

1752

/* Lower privileges */

1753

errno = 0;

1754

if(take_down_interface){

1755

/* Lower privileges */

1756

ret = seteuid(uid);

1757

if(ret == -1){

1758

perror_plus("seteuid");

1759

}

1760

} else {

1761

/* Lower privileges permanently */

1762

ret = setuid(uid);

1763

if(ret == -1){

1764

perror_plus("setuid");

1765

}

1766

}

1279

}

1280

1281

if(quit_now){

1282

goto end;

1283

}

1284

1285

uid = getuid();

1286

gid = getgid();

1287

1288

errno = 0;

1289

setgid(gid);

1290

if(ret == -1){

1291

perror("setgid");

1292

}

1293

1294

ret = setuid(uid);

1295

if(ret == -1){

1296

perror("setuid");

1767

1297

}

1768

1298

1769

1299

if(quit_now){

1773

1303

ret = init_gnutls_global(pubkey, seckey);

1774

1304

if(ret == -1){

1775

1305

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

1776

exitcode = EX_UNAVAILABLE;

1306

exitcode = EXIT_FAILURE;

1777

1307

goto end;

1778

1308

} else {

1779

1309

gnutls_initialized = true;

1783

1313

goto end;

1784

1314

}

1785

1315

1316

tempdir_created = true;

1786

1317

if(mkdtemp(tempdir) == NULL){

1787

perror_plus("mkdtemp");

1318

tempdir_created = false;

1319

perror("mkdtemp");

1788

1320

goto end;

1789

1321

}

1790

tempdir_created = true;

1791

1322

1792

1323

if(quit_now){

1793

1324

goto end;

1795

1326

1796

1327

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

1797

1328

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

1798

exitcode = EX_UNAVAILABLE;

1329

exitcode = EXIT_FAILURE;

1799

1330

goto end;

1800

1331

} else {

1801

1332

gpgme_initialized = true;

1811

1342

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

1812

1343

if(address == NULL){

1813

1344

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

1814

exitcode = EX_USAGE;

1345

exitcode = EXIT_FAILURE;

1815

1346

goto end;

1816

1347

}

1817

1348

1825

1356

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

1826

1357

or tmpmax != (uint16_t)tmpmax){

1827

1358

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

1828

exitcode = EX_USAGE;

1359

exitcode = EXIT_FAILURE;

1829

1360

goto end;

1830

1361

}

1831

1362

1835

1366

1836

1367

port = (uint16_t)tmpmax;

1837

1368

*address = '\0';

1369

address = connect_to;

1838

1370

/* Colon in address indicates IPv6 */

1839

1371

int af;

1840

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

1372

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

1841

1373

af = AF_INET6;

1842

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

1843

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

1844

{

1845

connect_to++;

1846

address[-1] = '\0';

1847

}

1848

1374

} else {

1849

1375

af = AF_INET;

1850

1376

}

1851

address = connect_to;

1852

1377

1853

1378

if(quit_now){

1854

1379

goto end;

1855

1380

}

1856

1381

1857

while(not quit_now){

1858

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

1859

if(quit_now or ret == 0){

1860

break;

1861

}

1862

if(debug){

1863

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

1864

(int)retry_interval);

1865

}

1866

sleep((int)retry_interval);

1867

}

1868

1869

if (not quit_now){

1382

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

1383

if(ret < 0){

1384

exitcode = EXIT_FAILURE;

1385

} else {

1870

1386

exitcode = EXIT_SUCCESS;

1871

1387

}

1872

1873

1388

goto end;

1874

1389

}

1875

1390

1899

1414

if(mc.server == NULL){

1900

1415

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

1901

1416

avahi_strerror(error));

1902

exitcode = EX_UNAVAILABLE;

1417

exitcode = EXIT_FAILURE;

1903

1418

goto end;

1904

1419

}

1905

1420

1914

1429

if(sb == NULL){

1915

1430

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

1916

1431

avahi_strerror(avahi_server_errno(mc.server)));

1917

exitcode = EX_UNAVAILABLE;

1432

exitcode = EXIT_FAILURE;

1918

1433

goto end;

1919

1434

}

1920

1435

1927

1442

if(debug){

1928

1443

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

1929

1444

}

1930

1931

ret = avahi_loop_with_timeout(mc.simple_poll,

1932

(int)(retry_interval * 1000));

1933

if(debug){

1934

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

1935

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

1936

}

1445

1446

avahi_simple_poll_loop(mc.simple_poll);

1937

1447

1938

1448

end:

1939

1449

1960

1470

if(gpgme_initialized){

1961

1471

gpgme_release(mc.ctx);

1962

1472

}

1963

1964

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

1965

has seen */

1966

if(mc.current_server != NULL){

1967

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

1968

while(mc.current_server != NULL){

1969

server *next = mc.current_server->next;

1970

free(mc.current_server);

1971

mc.current_server = next;

1972

}

1973

}

1974

1473

1975

1474

/* Take down the network interface */

1976

1475

if(take_down_interface){

1977

/* Re-raise priviliges */

1978

errno = 0;

1979

ret = seteuid(0);

1476

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

1980

1477

if(ret == -1){

1981

perror_plus("seteuid");

1478

perror("ioctl SIOCGIFFLAGS");

1479

} else if(network.ifr_flags & IFF_UP) {

1480

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

1481

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

1482

if(ret == -1){

1483

perror("ioctl SIOCSIFFLAGS");

1484

}

1982

1485

}

1983

if(geteuid() == 0){

1984

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

1985

if(ret == -1){

1986

perror_plus("ioctl SIOCGIFFLAGS");

1987

} else if(network.ifr_flags & IFF_UP) {

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1992

}

1993

}

1994

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

1995

if(ret == -1){

1996

perror_plus("close");

1997

}

1998

/* Lower privileges permanently */

1999

errno = 0;

2000

ret = setuid(uid);

2001

if(ret == -1){

2002

perror_plus("setuid");

2003

}

1486

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

1487

if(ret == -1){

1488

perror("close");

2004

1489

}

2005

1490

}

2006

1491

2007

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

1492

/* Removes the temp directory used by GPGME */

2008

1493

if(tempdir_created){

2009

struct dirent **direntries = NULL;

2010

struct dirent *direntry = NULL;

2011

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

2012

alphasort);

2013

if (numentries > 0){

2014

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

2015

direntry = direntries[i];

1494

DIR *d;

1495

struct dirent *direntry;

1496

d = opendir(tempdir);

1497

if(d == NULL){

1498

if(errno != ENOENT){

1499

perror("opendir");

1500

}

1501

} else {

1502

while(true){

1503

direntry = readdir(d);

1504

if(direntry == NULL){

1505

break;

1506

}

1507

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

1508

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

1509

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

1510

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

1511

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

1512

continue;

1513

}

2016

1514

char *fullname = NULL;

2017

1515

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

2018

1516

direntry->d_name);

2019

1517

if(ret < 0){

2020

perror_plus("asprintf");

1518

perror("asprintf");

2021

1519

continue;

2022

1520

}

2023

1521

ret = remove(fullname);

2027

1525

}

2028

1526

free(fullname);

2029

1527

}

2030

}

2031

2032

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

2033

free(direntries);

2034

if (numentries == -1){

2035

perror_plus("scandir");

1528

closedir(d);

2036

1529

}

2037

1530

ret = rmdir(tempdir);

2038

1531

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

2039

perror_plus("rmdir");

1532

perror("rmdir");

2040

1533

}

2041

1534

}

2042

1535

2043

1536

if(quit_now){

2044

1537

sigemptyset(&old_sigterm_action.sa_mask);

2045

1538

old_sigterm_action.sa_handler = SIG_DFL;

2046

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2047

&old_sigterm_action,

2048

NULL));

1539

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

2049

1540

if(ret == -1){

2050

perror_plus("sigaction");

2051

}

2052

do {

2053

ret = raise(signal_received);

2054

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

2055

if(ret != 0){

2056

perror_plus("raise");

2057

abort();

2058

}

2059

TEMP_FAILURE_RETRY(pause());

1541

perror("sigaction");

1542

}

1543

raise(signal_received);

2060

1544

}

2061

1545

2062

1546

return exitcode;