/mandos/trunk : revision 24.1.173

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

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() */

63

strtoimax() */

64

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

65

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

66

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

66

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

67

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

68

SIOCSIFFLAGS, if_indextoname(),

69

if_nametoindex(), IF_NAMESIZE */

72

*/

73

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

74

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

75

setgid() */

75

setgid(), pause() */

76

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

77

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

78

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

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

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

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

85

87

86

88

#ifdef __linux__

87

89

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

125

127

static const char mandos_protocol_version[] = "1";

126

128

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

127

129

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

130

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

131

char *connect_to = NULL;

128

132

129

133

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

130

134

typedef struct {

142

146

.dh_bits = 1024, .priority = "SECURE256"

143

147

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

144

148

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

145

152

/*

146

153

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

147

154

* bytes. "buffer_capacity" is how much is currently allocated,

476

483

/* GnuTLS session creation */

477

484

do {

478

485

ret = gnutls_init(session, GNUTLS_SERVER);

486

if(quit_now){

487

return -1;

488

}

479

489

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

480

490

if(ret != GNUTLS_E_SUCCESS){

481

491

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

486

496

const char *err;

487

497

do {

488

498

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

499

if(quit_now){

500

gnutls_deinit(*session);

501

return -1;

502

}

489

503

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

490

504

if(ret != GNUTLS_E_SUCCESS){

491

505

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

499

513

do {

500

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

501

515

mc.cred);

516

if(quit_now){

517

gnutls_deinit(*session);

518

return -1;

519

}

502

520

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

503

521

if(ret != GNUTLS_E_SUCCESS){

504

522

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

519

537

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

520

538

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

521

539

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

525

540

/* Called when a Mandos server is found */

526

541

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

527

542

AvahiIfIndex if_index,

533

548

struct sockaddr_in6 in6;

534

549

} to;

535

550

char *buffer = NULL;

536

char *decrypted_buffer;

551

char *decrypted_buffer = NULL;

537

552

size_t buffer_length = 0;

538

553

size_t buffer_capacity = 0;

539

554

size_t written;

540

int retval = 0;

555

int retval = -1;

541

556

gnutls_session_t session;

542

557

int pf; /* Protocol family */

543

558

559

errno = 0;

560

544

561

if(quit_now){

562

errno = EINTR;

545

563

return -1;

546

564

}

547

565

554

572

break;

555

573

default:

556

574

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

575

errno = EINVAL;

557

576

return -1;

558

577

}

559

578

569

588

570

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

571

590

if(tcp_sd < 0){

591

int e = errno;

572

592

perror("socket");

573

retval = -1;

593

errno = e;

574

594

goto mandos_end;

575

595

}

576

596

577

597

if(quit_now){

598

errno = EINTR;

578

599

goto mandos_end;

579

600

}

580

601

587

608

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

588

609

}

589

610

if(ret < 0 ){

611

int e = errno;

590

612

perror("inet_pton");

591

retval = -1;

613

errno = e;

592

614

goto mandos_end;

593

615

}

594

616

if(ret == 0){

617

int e = errno;

595

618

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

596

retval = -1;

619

errno = e;

597

620

goto mandos_end;

598

621

}

599

622

if(af == AF_INET6){

607

630

if(if_index == AVAHI_IF_UNSPEC){

608

631

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

609

632

" without a network interface\n");

610

retval = -1;

633

errno = EINVAL;

611

634

goto mandos_end;

612

635

}

613

636

/* Set the network interface number as scope */

620

643

}

621

644

622

645

if(quit_now){

646

errno = EINTR;

623

647

goto mandos_end;

624

648

}

625

649

656

680

}

657

681

658

682

if(quit_now){

683

errno = EINTR;

659

684

goto mandos_end;

660

685

}

661

686

665

690

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

666

691

}

667

692

if(ret < 0){

668

perror("connect");

669

retval = -1;

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

670

698

goto mandos_end;

671

699

}

672

700

673

701

if(quit_now){

702

errno = EINTR;

674

703

goto mandos_end;

675

704

}

676

705

681

710

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

682

711

out_size - written));

683

712

if(ret == -1){

713

int e = errno;

684

714

perror("write");

685

retval = -1;

715

errno = e;

686

716

goto mandos_end;

687

717

}

688

718

written += (size_t)ret;

698

728

}

699

729

700

730

if(quit_now){

731

errno = EINTR;

701

732

goto mandos_end;

702

733

}

703

734

}

707

738

}

708

739

709

740

if(quit_now){

741

errno = EINTR;

710

742

goto mandos_end;

711

743

}

712

744

745

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

713

746

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

714

747

715

748

if(quit_now){

749

errno = EINTR;

716

750

goto mandos_end;

717

751

}

718

752

719

753

do {

720

754

ret = gnutls_handshake(session);

721

755

if(quit_now){

756

errno = EINTR;

722

757

goto mandos_end;

723

758

}

724

759

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

728

763

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

729

764

gnutls_perror(ret);

730

765

}

731

retval = -1;

766

errno = EPROTO;

732

767

goto mandos_end;

733

768

}

734

769

742

777

while(true){

743

778

744

779

if(quit_now){

780

errno = EINTR;

745

781

goto mandos_end;

746

782

}

747

783

748

784

buffer_capacity = incbuffer(&buffer, buffer_length,

749

785

buffer_capacity);

750

786

if(buffer_capacity == 0){

787

int e = errno;

751

788

perror("incbuffer");

752

retval = -1;

789

errno = e;

753

790

goto mandos_end;

754

791

}

755

792

756

793

if(quit_now){

794

errno = EINTR;

757

795

goto mandos_end;

758

796

}

759

797

772

810

ret = gnutls_handshake(session);

773

811

774

812

if(quit_now){

813

errno = EINTR;

775

814

goto mandos_end;

776

815

}

777

816

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

778

817

if(ret < 0){

779

818

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

780

819

gnutls_perror(ret);

781

retval = -1;

820

errno = EPROTO;

782

821

goto mandos_end;

783

822

}

784

823

break;

785

824

default:

786

825

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

787

826

" encrypted session with Mandos server\n");

788

retval = -1;

789

827

gnutls_bye(session, GNUTLS_SHUT_RDWR);

828

errno = EIO;

790

829

goto mandos_end;

791

830

}

792

831

} else {

799

838

}

800

839

801

840

if(quit_now){

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

841

errno = EINTR;

842

goto mandos_end;

843

}

844

845

do {

846

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

847

if(quit_now){

848

errno = EINTR;

849

goto mandos_end;

850

}

851

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

810

852

811

853

if(buffer_length > 0){

812

854

ssize_t decrypted_buffer_size;

818

860

written = 0;

819

861

while(written < (size_t) decrypted_buffer_size){

820

862

if(quit_now){

863

errno = EINTR;

821

864

goto mandos_end;

822

865

}

823

866

825

868

(size_t)decrypted_buffer_size - written,

826

869

stdout);

827

870

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

871

int e = errno;

828

872

if(debug){

829

873

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

830

874

strerror(errno));

831

875

}

832

retval = -1;

833

break;

876

errno = e;

877

goto mandos_end;

834

878

}

835

879

written += (size_t)ret;

836

880

}

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

881

retval = 0;

840

882

}

841

} else {

842

retval = -1;

843

883

}

844

884

845

885

/* Shutdown procedure */

846

886

847

887

mandos_end:

848

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

852

if(ret == -1){

853

perror("close");

854

}

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

888

{

889

int e = errno;

890

free(decrypted_buffer);

891

free(buffer);

892

if(tcp_sd >= 0){

893

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

894

}

895

if(ret == -1){

896

if(e == 0){

897

e = errno;

898

}

899

perror("close");

900

}

901

gnutls_deinit(session);

902

if(quit_now){

903

e = EINTR;

904

retval = -1;

905

}

906

errno = e;

858

907

}

859

908

return retval;

860

909

}

976

1025

errno = old_errno;

977

1026

}

978

1027

1028

/*

1029

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

1030

* corresponds to an acceptable network device.

1031

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

1032

*/

1033

int good_interface(const struct dirent *if_entry){

1034

ssize_t ssret;

1035

char *flagname = NULL;

1036

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

1037

return 0;

1038

}

1039

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

1040

if_entry->d_name);

1041

if(ret < 0){

1042

perror("asprintf");

1043

return 0;

1044

}

1045

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

1046

if(flags_fd == -1){

1047

perror("open");

1048

free(flagname);

1049

return 0;

1050

}

1051

free(flagname);

1052

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

1053

/* read line from flags_fd */

1054

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

1055

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

1056

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

1057

if(flagstring == NULL){

1058

perror("malloc");

1059

close(flags_fd);

1060

return 0;

1061

}

1062

while(to_read > 0){

1063

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

1064

(size_t)to_read));

1065

if(ssret == -1){

1066

perror("read");

1067

free(flagstring);

1068

close(flags_fd);

1069

return 0;

1070

}

1071

to_read -= ssret;

1072

if(ssret == 0){

1073

break;

1074

}

1075

}

1076

close(flags_fd);

1077

intmax_t tmpmax;

1078

char *tmp;

1079

errno = 0;

1080

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

1081

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

1082

and not (isspace(*tmp)))

1083

or tmpmax != (ifreq_flags)tmpmax){

1084

if(debug){

1085

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

1086

flagstring, if_entry->d_name);

1087

}

1088

free(flagstring);

1089

return 0;

1090

}

1091

free(flagstring);

1092

ifreq_flags flags = (ifreq_flags)tmpmax;

1093

/* Reject the loopback device */

1094

if(flags & IFF_LOOPBACK){

1095

if(debug){

1096

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

1097

if_entry->d_name);

1098

}

1099

return 0;

1100

}

1101

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

1102

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

1103

if(debug){

1104

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

1105

if_entry->d_name);

1106

}

1107

return 1;

1108

}

1109

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

1110

if(not (flags & IFF_BROADCAST)){

1111

if(debug){

1112

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

1113

if_entry->d_name);

1114

}

1115

return 0;

1116

}

1117

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

1118

if(flags & IFF_NOARP){

1119

if(debug){

1120

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

1121

if_entry->d_name);

1122

}

1123

return 0;

1124

}

1125

/* Accept this device */

1126

if(debug){

1127

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

1128

if_entry->d_name);

1129

}

1130

return 1;

1131

}

1132

1133

int notdotentries(const struct dirent *direntry){

1134

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

1135

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

1136

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

1137

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

1138

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

1139

return 0;

1140

}

1141

return 1;

1142

}

1143

979

1144

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

980

1145

AvahiSServiceBrowser *sb = NULL;

981

1146

int error;

983

1148

intmax_t tmpmax;

984

1149

char *tmp;

985

1150

int exitcode = EXIT_SUCCESS;

986

const char *interface = "eth0";

1151

const char *interface = "";

987

1152

struct ifreq network;

988

1153

int sd = -1;

989

1154

bool take_down_interface = false;

990

1155

uid_t uid;

991

1156

gid_t gid;

992

char *connect_to = NULL;

993

1157

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

994

1158

bool tempdir_created = false;

995

1159

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1000

1164

bool gpgme_initialized = false;

1001

1165

float delay = 2.5f;

1002

1166

1003

struct sigaction old_sigterm_action;

1167

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1004

1168

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1005

1169

1006

1170

uid = getuid();

1058

1222

.arg = "SECONDS",

1059

1223

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

1060

1224

.group = 2 },

1225

/*

1226

* These reproduce what we would get without ARGP_NO_HELP

1227

*/

1228

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

1229

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

1230

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

1231

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

1232

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

1233

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

1061

1234

{ .name = NULL }

1062

1235

};

1063

1236

1064

1237

error_t parse_opt(int key, char *arg,

1065

1238

struct argp_state *state){

1239

errno = 0;

1066

1240

switch(key){

1067

1241

case 128: /* --debug */

1068

1242

debug = true;

1084

1258

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

1085

1259

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

1086

1260

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

1087

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

1088

exit(EXIT_FAILURE);

1261

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

1089

1262

}

1090

1263

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

1091

1264

break;

1096

1269

errno = 0;

1097

1270

delay = strtof(arg, &tmp);

1098

1271

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

1099

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

1100

exit(EXIT_FAILURE);

1272

argp_error(state, "Bad delay");

1101

1273

}

1102

1274

break;

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1275

/*

1276

* These reproduce what we would get without ARGP_NO_HELP

1277

*/

1278

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

1279

argp_state_help(state, state->out_stream,

1280

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1281

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1282

case -3: /* --usage */

1283

argp_state_help(state, state->out_stream,

1284

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1285

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

1286

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

1287

exit(argp_err_exit_status);

1106

1288

break;

1107

1289

default:

1108

1290

return ARGP_ERR_UNKNOWN;

1109

1291

}

1110

return 0;

1292

return errno;

1111

1293

}

1112

1294

1113

1295

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

1114

1296

.args_doc = "",

1115

1297

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

1116

1298

" passwords from a Mandos server" };

1117

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

1118

if(ret == ARGP_ERR_UNKNOWN){

1119

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

1120

exitcode = EXIT_FAILURE;

1299

ret = argp_parse(&argp, argc, argv,

1300

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1301

switch(ret){

1302

case 0:

1303

break;

1304

case ENOMEM:

1305

default:

1306

errno = ret;

1307

perror("argp_parse");

1308

exitcode = EX_OSERR;

1309

goto end;

1310

case EINVAL:

1311

exitcode = EX_USAGE;

1121

1312

goto end;

1122

1313

}

1123

1314

}

1125

1316

if(not debug){

1126

1317

avahi_set_log_function(empty_log);

1127

1318

}

1319

1320

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

1321

struct dirent **direntries;

1322

ret = scandir(sys_class_net, &direntries, good_interface,

1323

alphasort);

1324

if(ret >= 1){

1325

/* Pick the first good interface */

1326

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

1327

if(debug){

1328

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

1329

}

1330

if(interface == NULL){

1331

perror("malloc");

1332

free(direntries);

1333

exitcode = EXIT_FAILURE;

1334

goto end;

1335

}

1336

free(direntries);

1337

} else {

1338

free(direntries);

1339

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

1340

exitcode = EXIT_FAILURE;

1341

goto end;

1342

}

1343

}

1128

1344

1129

1345

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

1130

1346

from the signal handler */

1133

1349

mc.simple_poll = avahi_simple_poll_new();

1134

1350

if(mc.simple_poll == NULL){

1135

1351

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

1136

exitcode = EXIT_FAILURE;

1352

exitcode = EX_UNAVAILABLE;

1137

1353

goto end;

1138

1354

}

1139

1355

1141

1357

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

1142

1358

if(ret == -1){

1143

1359

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1360

exitcode = EX_OSERR;

1145

1361

goto end;

1146

1362

}

1147

1363

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

1148

1364

if(ret == -1){

1149

1365

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1366

exitcode = EX_OSERR;

1151

1367

goto end;

1152

1368

}

1153

1369

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

1154

1370

if(ret == -1){

1155

1371

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1372

exitcode = EX_OSERR;

1157

1373

goto end;

1158

1374

}

1159

1375

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

1163

1379

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

1164

1380

if(ret == -1){

1165

1381

perror("sigaction");

1166

return EXIT_FAILURE;

1382

return EX_OSERR;

1167

1383

}

1168

1384

if(old_sigterm_action.sa_handler != SIG_IGN){

1169

1385

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

1170

1386

if(ret == -1){

1171

1387

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1388

exitcode = EX_OSERR;

1173

1389

goto end;

1174

1390

}

1175

1391

}

1176

1392

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

1177

1393

if(ret == -1){

1178

1394

perror("sigaction");

1179

return EXIT_FAILURE;

1395

return EX_OSERR;

1180

1396

}

1181

1397

if(old_sigterm_action.sa_handler != SIG_IGN){

1182

1398

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

1183

1399

if(ret == -1){

1184

1400

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1401

exitcode = EX_OSERR;

1186

1402

goto end;

1187

1403

}

1188

1404

}

1189

1405

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

1190

1406

if(ret == -1){

1191

1407

perror("sigaction");

1192

return EXIT_FAILURE;

1408

return EX_OSERR;

1193

1409

}

1194

1410

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

1411

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

1196

1412

if(ret == -1){

1197

1413

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1414

exitcode = EX_OSERR;

1199

1415

goto end;

1200

1416

}

1201

1417

}

1202

1418

1203

1419

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

1204

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

1420

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

1205

1421

if_index = (AvahiIfIndex) if_nametoindex(interface);

1206

1422

if(if_index == 0){

1207

1423

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

1208

exitcode = EXIT_FAILURE;

1424

exitcode = EX_UNAVAILABLE;

1209

1425

goto end;

1210

1426

}

1211

1427

1222

1438

1223

1439

#ifdef __linux__

1224

1440

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1225

messages to mess up the prompt */

1441

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

1226

1442

ret = klogctl(8, NULL, 5);

1227

1443

bool restore_loglevel = true;

1228

1444

if(ret == -1){

1234

1450

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1235

1451

if(sd < 0){

1236

1452

perror("socket");

1237

exitcode = EXIT_FAILURE;

1453

exitcode = EX_OSERR;

1238

1454

#ifdef __linux__

1239

1455

if(restore_loglevel){

1240

1456

ret = klogctl(7, NULL, 0);

1263

1479

}

1264

1480

}

1265

1481

#endif /* __linux__ */

1266

exitcode = EXIT_FAILURE;

1482

exitcode = EX_OSERR;

1267

1483

/* Lower privileges */

1268

1484

errno = 0;

1269

1485

ret = seteuid(uid);

1278

1494

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

1279

1495

if(ret == -1){

1280

1496

take_down_interface = false;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1497

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1498

exitcode = EX_OSERR;

1283

1499

#ifdef __linux__

1284

1500

if(restore_loglevel){

1285

1501

ret = klogctl(7, NULL, 0);

1351

1567

ret = init_gnutls_global(pubkey, seckey);

1352

1568

if(ret == -1){

1353

1569

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

1354

exitcode = EXIT_FAILURE;

1570

exitcode = EX_UNAVAILABLE;

1355

1571

goto end;

1356

1572

} else {

1357

1573

gnutls_initialized = true;

1361

1577

goto end;

1362

1578

}

1363

1579

1364

tempdir_created = true;

1365

1580

if(mkdtemp(tempdir) == NULL){

1366

tempdir_created = false;

1367

1581

perror("mkdtemp");

1368

1582

goto end;

1369

1583

}

1584

tempdir_created = true;

1370

1585

1371

1586

if(quit_now){

1372

1587

goto end;

1374

1589

1375

1590

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

1376

1591

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

1377

exitcode = EXIT_FAILURE;

1592

exitcode = EX_UNAVAILABLE;

1378

1593

goto end;

1379

1594

} else {

1380

1595

gpgme_initialized = true;

1390

1605

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

1391

1606

if(address == NULL){

1392

1607

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

1393

exitcode = EXIT_FAILURE;

1608

exitcode = EX_USAGE;

1394

1609

goto end;

1395

1610

}

1396

1611

1404

1619

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

1405

1620

or tmpmax != (uint16_t)tmpmax){

1406

1621

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

1407

exitcode = EXIT_FAILURE;

1622

exitcode = EX_USAGE;

1408

1623

goto end;

1409

1624

}

1410

1625

1426

1641

if(quit_now){

1427

1642

goto end;

1428

1643

}

1429

1430

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

1431

if(ret < 0){

1432

exitcode = EXIT_FAILURE;

1433

} else {

1644

1645

while(not quit_now){

1646

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

1647

if(quit_now or ret == 0){

1648

break;

1649

}

1650

sleep(15);

1651

};

1652

1653

if (not quit_now){

1434

1654

exitcode = EXIT_SUCCESS;

1435

1655

}

1656

1436

1657

goto end;

1437

1658

}

1438

1659

1462

1683

if(mc.server == NULL){

1463

1684

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

1464

1685

avahi_strerror(error));

1465

exitcode = EXIT_FAILURE;

1686

exitcode = EX_UNAVAILABLE;

1466

1687

goto end;

1467

1688

}

1468

1689

1477

1698

if(sb == NULL){

1478

1699

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

1479

1700

avahi_strerror(avahi_server_errno(mc.server)));

1480

exitcode = EXIT_FAILURE;

1701

exitcode = EX_UNAVAILABLE;

1481

1702

goto end;

1482

1703

}

1483

1704

1532

1753

if(ret == -1){

1533

1754

perror("ioctl SIOCGIFFLAGS");

1534

1755

} else if(network.ifr_flags & IFF_UP) {

1535

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

1756

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

1536

1757

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

1537

1758

if(ret == -1){

1538

perror("ioctl SIOCSIFFLAGS");

1759

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1539

1760

}

1540

1761

}

1541

1762

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

1551

1772

}

1552

1773

}

1553

1774

1554

/* Removes the temp directory used by GPGME */

1775

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

1555

1776

if(tempdir_created){

1556

DIR *d;

1557

struct dirent *direntry;

1558

d = opendir(tempdir);

1559

if(d == NULL){

1560

if(errno != ENOENT){

1561

perror("opendir");

1562

}

1563

} else {

1564

while(true){

1565

direntry = readdir(d);

1566

if(direntry == NULL){

1567

break;

1568

}

1569

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

1570

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

1571

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

1572

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

1573

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

1574

continue;

1575

}

1777

struct dirent **direntries = NULL;

1778

struct dirent *direntry = NULL;

1779

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

1780

if (ret > 0){

1781

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

1782

direntry = direntries[i];

1576

1783

char *fullname = NULL;

1577

1784

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

1578

1785

direntry->d_name);

1587

1794

}

1588

1795

free(fullname);

1589

1796

}

1590

closedir(d);

1797

}

1798

1799

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

1800

free(direntries);

1801

if (ret == -1){

1802

perror("scandir");

1591

1803

}

1592

1804

ret = rmdir(tempdir);

1593

1805

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

1598

1810

if(quit_now){

1599

1811

sigemptyset(&old_sigterm_action.sa_mask);

1600

1812

old_sigterm_action.sa_handler = SIG_DFL;

1601

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

1813

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1814

&old_sigterm_action,

1815

NULL));

1602

1816

if(ret == -1){

1603

1817

perror("sigaction");

1604

1818

}

1605

raise(signal_received);

1819

do {

1820

ret = raise(signal_received);

1821

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

1822

if(ret != 0){

1823

perror("raise");

1824

abort();

1825

}

1826

TEMP_FAILURE_RETRY(pause());

1606

1827

}

1607

1828

1608

1829

return exitcode;