/mandos/release : 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 */

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

73

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

74

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

75

setgid() */

74

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

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,

164

171

*/

165

172

static bool init_gpgme(const char *seckey,

166

173

const char *pubkey, const char *tempdir){

167

int ret;

168

174

gpgme_error_t rc;

169

175

gpgme_engine_info_t engine_info;

170

176

173

179

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

174

180

*/

175

181

bool import_key(const char *filename){

182

int ret;

176

183

int fd;

177

184

gpgme_data_t pgp_data;

178

185

474

481

static int init_gnutls_session(gnutls_session_t *session){

475

482

int ret;

476

483

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

484

do {

485

ret = gnutls_init(session, GNUTLS_SERVER);

486

if(quit_now){

487

return -1;

488

}

489

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

478

490

if(ret != GNUTLS_E_SUCCESS){

479

491

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

480

492

safer_gnutls_strerror(ret));

482

494

483

495

{

484

496

const char *err;

485

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

497

do {

498

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

499

if(quit_now){

500

gnutls_deinit(*session);

501

return -1;

502

}

503

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

486

504

if(ret != GNUTLS_E_SUCCESS){

487

505

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

488

506

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

492

510

}

493

511

}

494

512

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

513

do {

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

516

if(quit_now){

517

gnutls_deinit(*session);

518

return -1;

519

}

520

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

497

521

if(ret != GNUTLS_E_SUCCESS){

498

522

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

499

523

safer_gnutls_strerror(ret));

502

526

}

503

527

504

528

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

530

508

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

532

514

537

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

515

538

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

516

539

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

540

/* Called when a Mandos server is found */

521

541

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

522

542

AvahiIfIndex if_index,

528

548

struct sockaddr_in6 in6;

529

549

} to;

530

550

char *buffer = NULL;

531

char *decrypted_buffer;

551

char *decrypted_buffer = NULL;

532

552

size_t buffer_length = 0;

533

553

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

535

554

size_t written;

536

int retval = 0;

555

int retval = -1;

537

556

gnutls_session_t session;

538

557

int pf; /* Protocol family */

539

558

559

errno = 0;

560

540

561

if(quit_now){

562

errno = EINTR;

541

563

return -1;

542

564

}

543

565

550

572

break;

551

573

default:

552

574

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

575

errno = EINVAL;

553

576

return -1;

554

577

}

555

578

565

588

566

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

567

590

if(tcp_sd < 0){

591

int e = errno;

568

592

perror("socket");

569

retval = -1;

593

errno = e;

570

594

goto mandos_end;

571

595

}

572

596

573

597

if(quit_now){

598

errno = EINTR;

574

599

goto mandos_end;

575

600

}

576

601

583

608

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

584

609

}

585

610

if(ret < 0 ){

611

int e = errno;

586

612

perror("inet_pton");

587

retval = -1;

613

errno = e;

588

614

goto mandos_end;

589

615

}

590

616

if(ret == 0){

617

int e = errno;

591

618

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

592

retval = -1;

619

errno = e;

593

620

goto mandos_end;

594

621

}

595

622

if(af == AF_INET6){

603

630

if(if_index == AVAHI_IF_UNSPEC){

604

631

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

605

632

" without a network interface\n");

606

retval = -1;

633

errno = EINVAL;

607

634

goto mandos_end;

608

635

}

609

636

/* Set the network interface number as scope */

616

643

}

617

644

618

645

if(quit_now){

646

errno = EINTR;

619

647

goto mandos_end;

620

648

}

621

649

652

680

}

653

681

654

682

if(quit_now){

683

errno = EINTR;

655

684

goto mandos_end;

656

685

}

657

686

661

690

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

662

691

}

663

692

if(ret < 0){

664

perror("connect");

665

retval = -1;

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

666

698

goto mandos_end;

667

699

}

668

700

669

701

if(quit_now){

702

errno = EINTR;

670

703

goto mandos_end;

671

704

}

672

705

677

710

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

678

711

out_size - written));

679

712

if(ret == -1){

713

int e = errno;

680

714

perror("write");

681

retval = -1;

715

errno = e;

682

716

goto mandos_end;

683

717

}

684

718

written += (size_t)ret;

694

728

}

695

729

696

730

if(quit_now){

731

errno = EINTR;

697

732

goto mandos_end;

698

733

}

699

734

}

703

738

}

704

739

705

740

if(quit_now){

741

errno = EINTR;

706

742

goto mandos_end;

707

743

}

708

744

745

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

709

746

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

710

747

711

748

if(quit_now){

749

errno = EINTR;

712

750

goto mandos_end;

713

751

}

714

752

715

do{

753

do {

716

754

ret = gnutls_handshake(session);

717

755

if(quit_now){

756

errno = EINTR;

718

757

goto mandos_end;

719

758

}

720

759

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

724

763

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

725

764

gnutls_perror(ret);

726

765

}

727

retval = -1;

766

errno = EPROTO;

728

767

goto mandos_end;

729

768

}

730

769

738

777

while(true){

739

778

740

779

if(quit_now){

780

errno = EINTR;

741

781

goto mandos_end;

742

782

}

743

783

744

784

buffer_capacity = incbuffer(&buffer, buffer_length,

745

785

buffer_capacity);

746

786

if(buffer_capacity == 0){

787

int e = errno;

747

788

perror("incbuffer");

748

retval = -1;

789

errno = e;

749

790

goto mandos_end;

750

791

}

751

792

752

793

if(quit_now){

794

errno = EINTR;

753

795

goto mandos_end;

754

796

}

755

797

764

806

case GNUTLS_E_AGAIN:

765

807

break;

766

808

case GNUTLS_E_REHANDSHAKE:

767

do{

809

do {

768

810

ret = gnutls_handshake(session);

769

811

770

812

if(quit_now){

813

errno = EINTR;

771

814

goto mandos_end;

772

815

}

773

816

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

774

817

if(ret < 0){

775

818

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

776

819

gnutls_perror(ret);

777

retval = -1;

820

errno = EPROTO;

778

821

goto mandos_end;

779

822

}

780

823

break;

781

824

default:

782

825

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

783

826

" encrypted session with Mandos server\n");

784

retval = -1;

785

827

gnutls_bye(session, GNUTLS_SHUT_RDWR);

828

errno = EIO;

786

829

goto mandos_end;

787

830

}

788

831

} else {

795

838

}

796

839

797

840

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

}

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);

806

852

807

853

if(buffer_length > 0){

854

ssize_t decrypted_buffer_size;

808

855

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

856

buffer_length,

810

857

&decrypted_buffer);

811

858

if(decrypted_buffer_size >= 0){

859

812

860

written = 0;

813

861

while(written < (size_t) decrypted_buffer_size){

814

862

if(quit_now){

863

errno = EINTR;

815

864

goto mandos_end;

816

865

}

817

866

819

868

(size_t)decrypted_buffer_size - written,

820

869

stdout);

821

870

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

871

int e = errno;

822

872

if(debug){

823

873

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

824

874

strerror(errno));

825

875

}

826

retval = -1;

827

break;

876

errno = e;

877

goto mandos_end;

828

878

}

829

879

written += (size_t)ret;

830

880

}

831

free(decrypted_buffer);

832

} else {

833

retval = -1;

881

retval = 0;

834

882

}

835

} else {

836

retval = -1;

837

883

}

838

884

839

885

/* Shutdown procedure */

840

886

841

887

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;

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;

852

907

}

853

908

return retval;

854

909

}

970

1025

errno = old_errno;

971

1026

}

972

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

973

1144

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

974

1145

AvahiSServiceBrowser *sb = NULL;

975

1146

int error;

977

1148

intmax_t tmpmax;

978

1149

char *tmp;

979

1150

int exitcode = EXIT_SUCCESS;

980

const char *interface = "eth0";

1151

const char *interface = "";

981

1152

struct ifreq network;

982

1153

int sd = -1;

983

1154

bool take_down_interface = false;

984

1155

uid_t uid;

985

1156

gid_t gid;

986

char *connect_to = NULL;

987

1157

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

988

1158

bool tempdir_created = false;

989

1159

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

994

1164

bool gpgme_initialized = false;

995

1165

float delay = 2.5f;

996

1166

997

struct sigaction old_sigterm_action;

1167

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

1168

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

999

1169

1170

uid = getuid();

1171

gid = getgid();

1172

1173

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

1174

errno = 0;

1175

ret = setgid(gid);

1176

if(ret == -1){

1177

perror("setgid");

1178

}

1179

1180

/* Lower user privileges (temporarily) */

1181

errno = 0;

1182

ret = seteuid(uid);

1183

if(ret == -1){

1184

perror("seteuid");

1185

}

1186

1187

if(quit_now){

1188

goto end;

1189

}

1190

1000

1191

{

1001

1192

struct argp_option options[] = {

1002

1193

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

1031

1222

.arg = "SECONDS",

1032

1223

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

1033

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 },

1034

1234

{ .name = NULL }

1035

1235

};

1036

1236

1037

1237

error_t parse_opt(int key, char *arg,

1038

1238

struct argp_state *state){

1239

errno = 0;

1039

1240

switch(key){

1040

1241

case 128: /* --debug */

1041

1242

debug = true;

1057

1258

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

1058

1259

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

1059

1260

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

1060

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

1061

exit(EXIT_FAILURE);

1261

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

1062

1262

}

1063

1263

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

1064

1264

break;

1069

1269

errno = 0;

1070

1270

delay = strtof(arg, &tmp);

1071

1271

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

1072

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

1073

exit(EXIT_FAILURE);

1272

argp_error(state, "Bad delay");

1074

1273

}

1075

1274

break;

1076

case ARGP_KEY_ARG:

1077

argp_usage(state);

1078

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);

1079

1288

break;

1080

1289

default:

1081

1290

return ARGP_ERR_UNKNOWN;

1082

1291

}

1083

return 0;

1292

return errno;

1084

1293

}

1085

1294

1086

1295

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

1087

1296

.args_doc = "",

1088

1297

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

1089

1298

" 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;

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;

1094

1312

goto end;

1095

1313

}

1096

1314

}

1098

1316

if(not debug){

1099

1317

avahi_set_log_function(empty_log);

1100

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

}

1101

1344

1102

1345

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

1103

1346

from the signal handler */

1106

1349

mc.simple_poll = avahi_simple_poll_new();

1107

1350

if(mc.simple_poll == NULL){

1108

1351

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

1109

exitcode = EXIT_FAILURE;

1352

exitcode = EX_UNAVAILABLE;

1110

1353

goto end;

1111

1354

}

1112

1355

1114

1357

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

1115

1358

if(ret == -1){

1116

1359

perror("sigaddset");

1117

exitcode = EXIT_FAILURE;

1360

exitcode = EX_OSERR;

1118

1361

goto end;

1119

1362

}

1120

1363

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

1121

1364

if(ret == -1){

1122

1365

perror("sigaddset");

1123

exitcode = EXIT_FAILURE;

1366

exitcode = EX_OSERR;

1124

1367

goto end;

1125

1368

}

1126

1369

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

1127

1370

if(ret == -1){

1128

1371

perror("sigaddset");

1129

exitcode = EXIT_FAILURE;

1372

exitcode = EX_OSERR;

1130

1373

goto end;

1131

1374

}

1132

1375

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

1136

1379

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

1137

1380

if(ret == -1){

1138

1381

perror("sigaction");

1139

return EXIT_FAILURE;

1382

return EX_OSERR;

1140

1383

}

1141

1384

if(old_sigterm_action.sa_handler != SIG_IGN){

1142

1385

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

1143

1386

if(ret == -1){

1144

1387

perror("sigaction");

1145

exitcode = EXIT_FAILURE;

1388

exitcode = EX_OSERR;

1146

1389

goto end;

1147

1390

}

1148

1391

}

1149

1392

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

1150

1393

if(ret == -1){

1151

1394

perror("sigaction");

1152

return EXIT_FAILURE;

1395

return EX_OSERR;

1153

1396

}

1154

1397

if(old_sigterm_action.sa_handler != SIG_IGN){

1155

1398

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

1156

1399

if(ret == -1){

1157

1400

perror("sigaction");

1158

exitcode = EXIT_FAILURE;

1401

exitcode = EX_OSERR;

1159

1402

goto end;

1160

1403

}

1161

1404

}

1162

1405

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

1163

1406

if(ret == -1){

1164

1407

perror("sigaction");

1165

return EXIT_FAILURE;

1408

return EX_OSERR;

1166

1409

}

1167

1410

if(old_sigterm_action.sa_handler != SIG_IGN){

1168

1411

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

1169

1412

if(ret == -1){

1170

1413

perror("sigaction");

1171

exitcode = EXIT_FAILURE;

1414

exitcode = EX_OSERR;

1172

1415

goto end;

1173

1416

}

1174

1417

}

1175

1418

1176

1419

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

1177

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

1420

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

1178

1421

if_index = (AvahiIfIndex) if_nametoindex(interface);

1179

1422

if(if_index == 0){

1180

1423

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

1181

exitcode = EXIT_FAILURE;

1424

exitcode = EX_UNAVAILABLE;

1182

1425

goto end;

1183

1426

}

1184

1427

1186

1429

goto end;

1187

1430

}

1188

1431

1432

/* Re-raise priviliges */

1433

errno = 0;

1434

ret = seteuid(0);

1435

if(ret == -1){

1436

perror("seteuid");

1437

}

1438

1189

1439

#ifdef __linux__

1190

1440

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1191

messages to mess up the prompt */

1441

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

1192

1442

ret = klogctl(8, NULL, 5);

1193

1443

bool restore_loglevel = true;

1194

1444

if(ret == -1){

1200

1450

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1201

1451

if(sd < 0){

1202

1452

perror("socket");

1203

exitcode = EXIT_FAILURE;

1453

exitcode = EX_OSERR;

1204

1454

#ifdef __linux__

1205

1455

if(restore_loglevel){

1206

1456

ret = klogctl(7, NULL, 0);

1209

1459

}

1210

1460

}

1211

1461

#endif /* __linux__ */

1462

/* Lower privileges */

1463

errno = 0;

1464

ret = seteuid(uid);

1465

if(ret == -1){

1466

perror("seteuid");

1467

}

1212

1468

goto end;

1213

1469

}

1214

1470

strcpy(network.ifr_name, interface);

1223

1479

}

1224

1480

}

1225

1481

#endif /* __linux__ */

1226

exitcode = EXIT_FAILURE;

1482

exitcode = EX_OSERR;

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

1486

if(ret == -1){

1487

perror("seteuid");

1488

}

1227

1489

goto end;

1228

1490

}

1229

1491

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

1232

1494

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

1233

1495

if(ret == -1){

1234

1496

take_down_interface = false;

1235

perror("ioctl SIOCSIFFLAGS");

1236

exitcode = EXIT_FAILURE;

1497

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1498

exitcode = EX_OSERR;

1237

1499

#ifdef __linux__

1238

1500

if(restore_loglevel){

1239

1501

ret = klogctl(7, NULL, 0);

1242

1504

}

1243

1505

}

1244

1506

#endif /* __linux__ */

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror("seteuid");

1512

}

1245

1513

goto end;

1246

1514

}

1247

1515

}

1275

1543

}

1276

1544

}

1277

1545

#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");

1546

/* Lower privileges */

1547

errno = 0;

1548

if(take_down_interface){

1549

/* Lower privileges */

1550

ret = seteuid(uid);

1551

if(ret == -1){

1552

perror("seteuid");

1553

}

1554

} else {

1555

/* Lower privileges permanently */

1556

ret = setuid(uid);

1557

if(ret == -1){

1558

perror("setuid");

1559

}

1560

}

1296

1561

}

1297

1562

1298

1563

if(quit_now){

1302

1567

ret = init_gnutls_global(pubkey, seckey);

1303

1568

if(ret == -1){

1304

1569

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

1305

exitcode = EXIT_FAILURE;

1570

exitcode = EX_UNAVAILABLE;

1306

1571

goto end;

1307

1572

} else {

1308

1573

gnutls_initialized = true;

1312

1577

goto end;

1313

1578

}

1314

1579

1315

tempdir_created = true;

1316

1580

if(mkdtemp(tempdir) == NULL){

1317

tempdir_created = false;

1318

1581

perror("mkdtemp");

1319

1582

goto end;

1320

1583

}

1584

tempdir_created = true;

1321

1585

1322

1586

if(quit_now){

1323

1587

goto end;

1325

1589

1326

1590

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

1327

1591

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

1328

exitcode = EXIT_FAILURE;

1592

exitcode = EX_UNAVAILABLE;

1329

1593

goto end;

1330

1594

} else {

1331

1595

gpgme_initialized = true;

1341

1605

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

1342

1606

if(address == NULL){

1343

1607

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

1344

exitcode = EXIT_FAILURE;

1608

exitcode = EX_USAGE;

1345

1609

goto end;

1346

1610

}

1347

1611

1355

1619

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

1356

1620

or tmpmax != (uint16_t)tmpmax){

1357

1621

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

1358

exitcode = EXIT_FAILURE;

1622

exitcode = EX_USAGE;

1359

1623

goto end;

1360

1624

}

1361

1625

1377

1641

if(quit_now){

1378

1642

goto end;

1379

1643

}

1380

1381

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

1382

if(ret < 0){

1383

exitcode = EXIT_FAILURE;

1384

} 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){

1385

1654

exitcode = EXIT_SUCCESS;

1386

1655

}

1656

1387

1657

goto end;

1388

1658

}

1389

1659

1413

1683

if(mc.server == NULL){

1414

1684

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

1415

1685

avahi_strerror(error));

1416

exitcode = EXIT_FAILURE;

1686

exitcode = EX_UNAVAILABLE;

1417

1687

goto end;

1418

1688

}

1419

1689

1428

1698

if(sb == NULL){

1429

1699

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

1430

1700

avahi_strerror(avahi_server_errno(mc.server)));

1431

exitcode = EXIT_FAILURE;

1701

exitcode = EX_UNAVAILABLE;

1432

1702

goto end;

1433

1703

}

1434

1704

1472

1742

1473

1743

/* Take down the network interface */

1474

1744

if(take_down_interface){

1475

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

1745

/* Re-raise priviliges */

1746

errno = 0;

1747

ret = seteuid(0);

1476

1748

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

}

1749

perror("seteuid");

1484

1750

}

1485

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

1486

if(ret == -1){

1487

perror("close");

1751

if(geteuid() == 0){

1752

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

1753

if(ret == -1){

1754

perror("ioctl SIOCGIFFLAGS");

1755

} else if(network.ifr_flags & IFF_UP) {

1756

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

1757

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

1758

if(ret == -1){

1759

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1760

}

1761

}

1762

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

1763

if(ret == -1){

1764

perror("close");

1765

}

1766

/* Lower privileges permanently */

1767

errno = 0;

1768

ret = setuid(uid);

1769

if(ret == -1){

1770

perror("setuid");

1771

}

1488

1772

}

1489

1773

}

1490

1774

1491

/* Removes the temp directory used by GPGME */

1775

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

1492

1776

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

}

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];

1513

1783

char *fullname = NULL;

1514

1784

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

1515

1785

direntry->d_name);

1524

1794

}

1525

1795

free(fullname);

1526

1796

}

1527

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");

1528

1803

}

1529

1804

ret = rmdir(tempdir);

1530

1805

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

1535

1810

if(quit_now){

1536

1811

sigemptyset(&old_sigterm_action.sa_mask);

1537

1812

old_sigterm_action.sa_handler = SIG_DFL;

1538

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

1813

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1814

&old_sigterm_action,

1815

NULL));

1539

1816

if(ret == -1){

1540

1817

perror("sigaction");

1541

1818

}

1542

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());

1543

1827

}

1544

1828

1545

1829

return exitcode;