/mandos/trunk : revision 355

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, 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() */

63

strtoimax() */

64

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

65

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

66

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

66

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

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(), seteuid(),

75

setgid(), pause() */

74

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

75

setgid() */

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 */

87

85

88

86

#ifdef __linux__

89

87

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

127

125

static const char mandos_protocol_version[] = "1";

128

126

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

129

127

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

130

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

131

char *connect_to = NULL;

132

128

133

129

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

134

130

typedef struct {

146

142

.dh_bits = 1024, .priority = "SECURE256"

147

143

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

148

144

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

152

145

/*

153

146

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

154

147

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

171

164

*/

172

165

static bool init_gpgme(const char *seckey,

173

166

const char *pubkey, const char *tempdir){

167

int ret;

174

168

gpgme_error_t rc;

175

169

gpgme_engine_info_t engine_info;

176

170

179

173

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

180

174

*/

181

175

bool import_key(const char *filename){

182

int ret;

183

176

int fd;

184

177

gpgme_data_t pgp_data;

185

178

481

474

static int init_gnutls_session(gnutls_session_t *session){

482

475

int ret;

483

476

/* GnuTLS session creation */

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);

477

ret = gnutls_init(session, GNUTLS_SERVER);

490

478

if(ret != GNUTLS_E_SUCCESS){

491

479

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

492

480

safer_gnutls_strerror(ret));

494

482

495

483

{

496

484

const char *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);

485

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

504

486

if(ret != GNUTLS_E_SUCCESS){

505

487

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

506

488

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

510

492

}

511

493

}

512

494

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);

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

521

497

if(ret != GNUTLS_E_SUCCESS){

522

498

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

523

499

safer_gnutls_strerror(ret));

526

502

}

527

503

528

504

/* ignore client certificate if any. */

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

530

507

531

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

532

509

537

514

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

538

515

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

539

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

540

520

/* Called when a Mandos server is found */

541

521

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

542

522

AvahiIfIndex if_index,

543

523

int af){

544

int ret, tcp_sd = -1;

524

int ret, tcp_sd;

545

525

ssize_t sret;

546

526

union {

547

527

struct sockaddr_in in;

548

528

struct sockaddr_in6 in6;

549

529

} to;

550

530

char *buffer = NULL;

551

char *decrypted_buffer = NULL;

531

char *decrypted_buffer;

552

532

size_t buffer_length = 0;

553

533

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

554

535

size_t written;

555

int retval = -1;

536

int retval = 0;

556

537

gnutls_session_t session;

557

538

int pf; /* Protocol family */

558

539

559

errno = 0;

560

561

if(quit_now){

562

errno = EINTR;

563

return -1;

564

}

565

566

540

switch(af){

567

541

case AF_INET6:

568

542

pf = PF_INET6;

572

546

break;

573

547

default:

574

548

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

575

errno = EINVAL;

576

549

return -1;

577

550

}

578

551

588

561

589

562

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

563

if(tcp_sd < 0){

591

int e = errno;

592

564

perror("socket");

593

errno = e;

594

goto mandos_end;

595

}

596

597

if(quit_now){

598

errno = EINTR;

599

goto mandos_end;

565

return -1;

600

566

}

601

567

602

568

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

608

574

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

609

575

}

610

576

if(ret < 0 ){

611

int e = errno;

612

577

perror("inet_pton");

613

errno = e;

614

goto mandos_end;

578

return -1;

615

579

}

616

580

if(ret == 0){

617

int e = errno;

618

581

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

619

errno = e;

620

goto mandos_end;

582

return -1;

621

583

}

622

584

if(af == AF_INET6){

623

585

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

630

592

if(if_index == AVAHI_IF_UNSPEC){

631

593

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

632

594

" without a network interface\n");

633

errno = EINVAL;

634

goto mandos_end;

595

return -1;

635

596

}

636

597

/* Set the network interface number as scope */

637

598

to.in6.sin6_scope_id = (uint32_t)if_index;

642

603

-Wunreachable-code */

643

604

}

644

605

645

if(quit_now){

646

errno = EINTR;

647

goto mandos_end;

648

}

649

650

606

if(debug){

651

607

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

652

608

char interface[IF_NAMESIZE];

679

635

}

680

636

}

681

637

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

687

638

if(af == AF_INET6){

688

639

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

689

640

} else {

690

641

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

691

642

}

692

643

if(ret < 0){

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

698

goto mandos_end;

699

}

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

644

perror("connect");

645

return -1;

704

646

}

705

647

706

648

const char *out = mandos_protocol_version;

710

652

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

711

653

out_size - written));

712

654

if(ret == -1){

713

int e = errno;

714

655

perror("write");

715

errno = e;

656

retval = -1;

716

657

goto mandos_end;

717

658

}

718

659

written += (size_t)ret;

726

667

break;

727

668

}

728

669

}

729

730

if(quit_now){

731

errno = EINTR;

732

goto mandos_end;

733

}

734

670

}

735

671

736

672

if(debug){

737

673

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

738

674

}

739

675

740

if(quit_now){

741

errno = EINTR;

742

goto mandos_end;

743

}

744

745

676

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

677

747

if(quit_now){

748

errno = EINTR;

749

goto mandos_end;

750

}

751

752

do {

678

do{

753

679

ret = gnutls_handshake(session);

754

if(quit_now){

755

errno = EINTR;

756

goto mandos_end;

757

}

758

680

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

759

681

760

682

if(ret != GNUTLS_E_SUCCESS){

762

684

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

763

685

gnutls_perror(ret);

764

686

}

765

errno = EPROTO;

687

retval = -1;

766

688

goto mandos_end;

767

689

}

768

690

774

696

}

775

697

776

698

while(true){

777

778

if(quit_now){

779

errno = EINTR;

780

goto mandos_end;

781

}

782

783

699

buffer_capacity = incbuffer(&buffer, buffer_length,

784

700

buffer_capacity);

785

701

if(buffer_capacity == 0){

786

int e = errno;

787

702

perror("incbuffer");

788

errno = e;

789

goto mandos_end;

790

}

791

792

if(quit_now){

793

errno = EINTR;

703

retval = -1;

794

704

goto mandos_end;

795

705

}

796

706

805

715

case GNUTLS_E_AGAIN:

806

716

break;

807

717

case GNUTLS_E_REHANDSHAKE:

808

do {

718

do{

809

719

ret = gnutls_handshake(session);

810

811

if(quit_now){

812

errno = EINTR;

813

goto mandos_end;

814

}

815

720

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

816

721

if(ret < 0){

817

722

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

818

723

gnutls_perror(ret);

819

errno = EPROTO;

724

retval = -1;

820

725

goto mandos_end;

821

726

}

822

727

break;

823

728

default:

824

729

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

825

730

" encrypted session with Mandos server\n");

731

retval = -1;

826

732

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

errno = EIO;

828

733

goto mandos_end;

829

734

}

830

735

} else {

836

741

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

837

742

}

838

743

839

if(quit_now){

840

errno = EINTR;

841

goto mandos_end;

842

}

843

844

do {

845

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

846

if(quit_now){

847

errno = EINTR;

848

goto mandos_end;

849

}

850

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

744

gnutls_bye(session, GNUTLS_SHUT_RDWR);

851

745

852

746

if(buffer_length > 0){

853

ssize_t decrypted_buffer_size;

854

747

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

748

buffer_length,

856

749

&decrypted_buffer);

857

750

if(decrypted_buffer_size >= 0){

858

859

751

written = 0;

860

752

while(written < (size_t) decrypted_buffer_size){

861

if(quit_now){

862

errno = EINTR;

863

goto mandos_end;

864

}

865

866

753

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

867

754

(size_t)decrypted_buffer_size - written,

868

755

stdout);

869

756

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

870

int e = errno;

871

757

if(debug){

872

758

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

873

759

strerror(errno));

874

760

}

875

errno = e;

876

goto mandos_end;

761

retval = -1;

762

break;

877

763

}

878

764

written += (size_t)ret;

879

765

}

880

retval = 0;

766

free(decrypted_buffer);

767

} else {

768

retval = -1;

881

769

}

770

} else {

771

retval = -1;

882

772

}

883

773

884

774

/* Shutdown procedure */

885

775

886

776

mandos_end:

887

{

888

int e = errno;

889

free(decrypted_buffer);

890

free(buffer);

891

if(tcp_sd >= 0){

892

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

893

}

894

if(ret == -1){

895

if(e == 0){

896

e = errno;

897

}

898

perror("close");

899

}

900

gnutls_deinit(session);

901

if(quit_now){

902

e = EINTR;

903

retval = -1;

904

}

905

errno = e;

777

free(buffer);

778

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

779

if(ret == -1){

780

perror("close");

906

781

}

782

gnutls_deinit(session);

907

783

return retval;

908

784

}

909

785

972

848

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

973

849

is removed from the LAN */

974

850

975

if(quit_now){

976

return;

977

}

978

979

851

switch(event){

980

852

default:

981

853

case AVAHI_BROWSER_FAILURE:

1024

896

errno = old_errno;

1025

897

}

1026

898

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

return 0;

1037

}

1038

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

1039

if_entry->d_name);

1040

if(ret < 0){

1041

perror("asprintf");

1042

return 0;

1043

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

free(flagname);

1048

return 0;

1049

}

1050

free(flagname);

1051

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

1052

/* read line from flags_fd */

1053

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

1054

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

1055

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

1056

if(flagstring == NULL){

1057

perror("malloc");

1058

close(flags_fd);

1059

return 0;

1060

}

1061

while(to_read > 0){

1062

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

1063

(size_t)to_read));

1064

if(ssret == -1){

1065

perror("read");

1066

free(flagstring);

1067

close(flags_fd);

1068

return 0;

1069

}

1070

to_read -= ssret;

1071

if(ssret == 0){

1072

break;

1073

}

1074

}

1075

close(flags_fd);

1076

intmax_t tmpmax;

1077

char *tmp;

1078

errno = 0;

1079

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

1080

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

1081

and not (isspace(*tmp)))

1082

or tmpmax != (ifreq_flags)tmpmax){

1083

if(debug){

1084

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

1085

flagstring, if_entry->d_name);

1086

}

1087

free(flagstring);

1088

return 0;

1089

}

1090

free(flagstring);

1091

ifreq_flags flags = (ifreq_flags)tmpmax;

1092

/* Reject the loopback device */

1093

if(flags & IFF_LOOPBACK){

1094

if(debug){

1095

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

1096

if_entry->d_name);

1097

}

1098

return 0;

1099

}

1100

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

1101

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

1102

if(debug){

1103

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

1104

if_entry->d_name);

1105

}

1106

return 1;

1107

}

1108

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

1109

if(not (flags & IFF_BROADCAST)){

1110

if(debug){

1111

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

1112

if_entry->d_name);

1113

}

1114

return 0;

1115

}

1116

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

1117

if(flags & IFF_NOARP){

1118

if(debug){

1119

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

1120

if_entry->d_name);

1121

}

1122

return 0;

1123

}

1124

/* Accept this device */

1125

if(debug){

1126

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

1127

if_entry->d_name);

1128

}

1129

return 1;

1130

}

1131

1132

899

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

1133

900

AvahiSServiceBrowser *sb = NULL;

1134

901

int error;

1136

903

intmax_t tmpmax;

1137

904

char *tmp;

1138

905

int exitcode = EXIT_SUCCESS;

1139

const char *interface = "";

906

const char *interface = "eth0";

1140

907

struct ifreq network;

1141

908

int sd = -1;

1142

909

bool take_down_interface = false;

1143

910

uid_t uid;

1144

911

gid_t gid;

912

char *connect_to = NULL;

1145

913

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

1146

914

bool tempdir_created = false;

1147

915

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1152

920

bool gpgme_initialized = false;

1153

921

float delay = 2.5f;

1154

922

1155

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

923

struct sigaction old_sigterm_action;

1156

924

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1157

925

1158

uid = getuid();

1159

gid = getgid();

1160

1161

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

1162

errno = 0;

1163

ret = setgid(gid);

1164

if(ret == -1){

1165

perror("setgid");

1166

}

1167

1168

/* Lower user privileges (temporarily) */

1169

errno = 0;

1170

ret = seteuid(uid);

1171

if(ret == -1){

1172

perror("seteuid");

1173

}

1174

1175

if(quit_now){

1176

goto end;

1177

}

1178

1179

926

{

1180

927

struct argp_option options[] = {

1181

928

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

1210

957

.arg = "SECONDS",

1211

958

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

1212

959

.group = 2 },

1213

/*

1214

* These reproduce what we would get without ARGP_NO_HELP

1215

*/

1216

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

1217

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

1218

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

1219

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

1220

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

1221

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

1222

960

{ .name = NULL }

1223

961

};

1224

962

1225

963

error_t parse_opt(int key, char *arg,

1226

964

struct argp_state *state){

1227

errno = 0;

1228

965

switch(key){

1229

966

case 128: /* --debug */

1230

967

debug = true;

1246

983

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

1247

984

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

1248

985

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

1249

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

986

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

987

exit(EXIT_FAILURE);

1250

988

}

1251

989

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

1252

990

break;

1257

995

errno = 0;

1258

996

delay = strtof(arg, &tmp);

1259

997

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

1260

argp_error(state, "Bad delay");

998

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

999

exit(EXIT_FAILURE);

1261

1000

}

1262

1001

break;

1263

/*

1264

* These reproduce what we would get without ARGP_NO_HELP

1265

*/

1266

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

1267

argp_state_help(state, state->out_stream,

1268

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1269

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1270

case -3: /* --usage */

1271

argp_state_help(state, state->out_stream,

1272

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1273

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

1274

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

1275

exit(argp_err_exit_status);

1002

case ARGP_KEY_ARG:

1003

argp_usage(state);

1004

case ARGP_KEY_END:

1276

1005

break;

1277

1006

default:

1278

1007

return ARGP_ERR_UNKNOWN;

1279

1008

}

1280

return errno;

1009

return 0;

1281

1010

}

1282

1011

1283

1012

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

1284

1013

.args_doc = "",

1285

1014

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

1286

1015

" passwords from a Mandos server" };

1287

ret = argp_parse(&argp, argc, argv,

1288

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1289

switch(ret){

1290

case 0:

1291

break;

1292

case ENOMEM:

1293

default:

1294

errno = ret;

1295

perror("argp_parse");

1296

exitcode = EX_OSERR;

1297

goto end;

1298

case EINVAL:

1299

exitcode = EX_USAGE;

1016

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

1017

if(ret == ARGP_ERR_UNKNOWN){

1018

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

1019

exitcode = EXIT_FAILURE;

1300

1020

goto end;

1301

1021

}

1302

1022

}

1304

1024

if(not debug){

1305

1025

avahi_set_log_function(empty_log);

1306

1026

}

1307

1308

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

1309

struct dirent **direntries;

1310

ret = scandir(sys_class_net, &direntries, good_interface,

1311

alphasort);

1312

if(ret >= 1){

1313

/* Pick the first good interface */

1314

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

1315

if(debug){

1316

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

1317

}

1318

if(interface == NULL){

1319

perror("malloc");

1320

free(direntries);

1321

exitcode = EXIT_FAILURE;

1322

goto end;

1323

}

1324

free(direntries);

1325

} else {

1326

free(direntries);

1327

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

1328

exitcode = EXIT_FAILURE;

1329

goto end;

1330

}

1331

}

1332

1027

1333

1028

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

1334

1029

from the signal handler */

1337

1032

mc.simple_poll = avahi_simple_poll_new();

1338

1033

if(mc.simple_poll == NULL){

1339

1034

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

1340

exitcode = EX_UNAVAILABLE;

1035

exitcode = EXIT_FAILURE;

1341

1036

goto end;

1342

1037

}

1343

1038

1345

1040

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

1346

1041

if(ret == -1){

1347

1042

perror("sigaddset");

1348

exitcode = EX_OSERR;

1043

exitcode = EXIT_FAILURE;

1349

1044

goto end;

1350

1045

}

1351

1046

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

1352

1047

if(ret == -1){

1353

1048

perror("sigaddset");

1354

exitcode = EX_OSERR;

1049

exitcode = EXIT_FAILURE;

1355

1050

goto end;

1356

1051

}

1357

1052

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

1358

1053

if(ret == -1){

1359

1054

perror("sigaddset");

1360

exitcode = EX_OSERR;

1361

goto end;

1362

}

1363

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

1364

| [[info:libc:Initial Signal Actions]] |

1365

| [[info:libc:Basic Signal Handling]] |

1366

*/

1367

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

1368

if(ret == -1){

1369

perror("sigaction");

1370

return EX_OSERR;

1371

}

1372

if(old_sigterm_action.sa_handler != SIG_IGN){

1373

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

1374

if(ret == -1){

1375

perror("sigaction");

1376

exitcode = EX_OSERR;

1377

goto end;

1378

}

1379

}

1380

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

1381

if(ret == -1){

1382

perror("sigaction");

1383

return EX_OSERR;

1384

}

1385

if(old_sigterm_action.sa_handler != SIG_IGN){

1386

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

1387

if(ret == -1){

1388

perror("sigaction");

1389

exitcode = EX_OSERR;

1390

goto end;

1391

}

1392

}

1393

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

1394

if(ret == -1){

1395

perror("sigaction");

1396

return EX_OSERR;

1397

}

1398

if(old_sigterm_action.sa_handler != SIG_IGN){

1399

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

1400

if(ret == -1){

1401

perror("sigaction");

1402

exitcode = EX_OSERR;

1403

goto end;

1404

}

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1058

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

1059

if(ret == -1){

1060

perror("sigaction");

1061

exitcode = EXIT_FAILURE;

1062

goto end;

1063

}

1064

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

1065

if(ret == -1){

1066

perror("sigaction");

1067

exitcode = EXIT_FAILURE;

1068

goto end;

1069

}

1070

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

1071

if(ret == -1){

1072

perror("sigaction");

1073

exitcode = EXIT_FAILURE;

1074

goto end;

1405

1075

}

1406

1076

1407

1077

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

1408

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

1078

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

1409

1079

if_index = (AvahiIfIndex) if_nametoindex(interface);

1410

1080

if(if_index == 0){

1411

1081

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

1412

exitcode = EX_UNAVAILABLE;

1082

exitcode = EXIT_FAILURE;

1413

1083

goto end;

1414

1084

}

1415

1085

1417

1087

goto end;

1418

1088

}

1419

1089

1420

/* Re-raise priviliges */

1421

errno = 0;

1422

ret = seteuid(0);

1423

if(ret == -1){

1424

perror("seteuid");

1425

}

1426

1427

1090

#ifdef __linux__

1428

1091

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1429

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

1092

messages to mess up the prompt */

1430

1093

ret = klogctl(8, NULL, 5);

1431

1094

bool restore_loglevel = true;

1432

1095

if(ret == -1){

1438

1101

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1439

1102

if(sd < 0){

1440

1103

perror("socket");

1441

exitcode = EX_OSERR;

1104

exitcode = EXIT_FAILURE;

1442

1105

#ifdef __linux__

1443

1106

if(restore_loglevel){

1444

1107

ret = klogctl(7, NULL, 0);

1447

1110

}

1448

1111

}

1449

1112

#endif /* __linux__ */

1450

/* Lower privileges */

1451

errno = 0;

1452

ret = seteuid(uid);

1453

if(ret == -1){

1454

perror("seteuid");

1455

}

1456

1113

goto end;

1457

1114

}

1458

1115

strcpy(network.ifr_name, interface);

1467

1124

}

1468

1125

}

1469

1126

#endif /* __linux__ */

1470

exitcode = EX_OSERR;

1471

/* Lower privileges */

1472

errno = 0;

1473

ret = seteuid(uid);

1474

if(ret == -1){

1475

perror("seteuid");

1476

}

1127

exitcode = EXIT_FAILURE;

1477

1128

goto end;

1478

1129

}

1479

1130

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

1482

1133

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

1483

1134

if(ret == -1){

1484

1135

take_down_interface = false;

1485

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1486

exitcode = EX_OSERR;

1136

perror("ioctl SIOCSIFFLAGS");

1137

exitcode = EXIT_FAILURE;

1487

1138

#ifdef __linux__

1488

1139

if(restore_loglevel){

1489

1140

ret = klogctl(7, NULL, 0);

1492

1143

}

1493

1144

}

1494

1145

#endif /* __linux__ */

1495

/* Lower privileges */

1496

errno = 0;

1497

ret = seteuid(uid);

1498

if(ret == -1){

1499

perror("seteuid");

1500

}

1501

1146

goto end;

1502

1147

}

1503

1148

}

1531

1176

}

1532

1177

}

1533

1178

#endif /* __linux__ */

1534

/* Lower privileges */

1535

errno = 0;

1536

if(take_down_interface){

1537

/* Lower privileges */

1538

ret = seteuid(uid);

1539

if(ret == -1){

1540

perror("seteuid");

1541

}

1542

} else {

1543

/* Lower privileges permanently */

1544

ret = setuid(uid);

1545

if(ret == -1){

1546

perror("setuid");

1547

}

1548

}

1179

}

1180

1181

if(quit_now){

1182

goto end;

1183

}

1184

1185

uid = getuid();

1186

gid = getgid();

1187

1188

errno = 0;

1189

setgid(gid);

1190

if(ret == -1){

1191

perror("setgid");

1192

}

1193

1194

ret = setuid(uid);

1195

if(ret == -1){

1196

perror("setuid");

1549

1197

}

1550

1198

1551

1199

if(quit_now){

1555

1203

ret = init_gnutls_global(pubkey, seckey);

1556

1204

if(ret == -1){

1557

1205

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

1558

exitcode = EX_UNAVAILABLE;

1206

exitcode = EXIT_FAILURE;

1559

1207

goto end;

1560

1208

} else {

1561

1209

gnutls_initialized = true;

1578

1226

1579

1227

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

1580

1228

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

1581

exitcode = EX_UNAVAILABLE;

1229

exitcode = EXIT_FAILURE;

1582

1230

goto end;

1583

1231

} else {

1584

1232

gpgme_initialized = true;

1594

1242

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

1595

1243

if(address == NULL){

1596

1244

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

1597

exitcode = EX_USAGE;

1245

exitcode = EXIT_FAILURE;

1598

1246

goto end;

1599

1247

}

1600

1248

1608

1256

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

1609

1257

or tmpmax != (uint16_t)tmpmax){

1610

1258

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

1611

exitcode = EX_USAGE;

1259

exitcode = EXIT_FAILURE;

1612

1260

goto end;

1613

1261

}

1614

1262

1630

1278

if(quit_now){

1631

1279

goto end;

1632

1280

}

1633

1634

while(not quit_now){

1635

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

1636

if(quit_now or ret == 0){

1637

break;

1638

}

1639

sleep(15);

1640

};

1641

1642

if (not quit_now){

1281

1282

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

1283

if(ret < 0){

1284

exitcode = EXIT_FAILURE;

1285

} else {

1643

1286

exitcode = EXIT_SUCCESS;

1644

1287

}

1645

1646

1288

goto end;

1647

1289

}

1648

1290

1672

1314

if(mc.server == NULL){

1673

1315

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

1674

1316

avahi_strerror(error));

1675

exitcode = EX_UNAVAILABLE;

1317

exitcode = EXIT_FAILURE;

1676

1318

goto end;

1677

1319

}

1678

1320

1687

1329

if(sb == NULL){

1688

1330

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

1689

1331

avahi_strerror(avahi_server_errno(mc.server)));

1690

exitcode = EX_UNAVAILABLE;

1332

exitcode = EXIT_FAILURE;

1691

1333

goto end;

1692

1334

}

1693

1335

1731

1373

1732

1374

/* Take down the network interface */

1733

1375

if(take_down_interface){

1734

/* Re-raise priviliges */

1735

errno = 0;

1736

ret = seteuid(0);

1376

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

1737

1377

if(ret == -1){

1738

perror("seteuid");

1378

perror("ioctl SIOCGIFFLAGS");

1379

} else if(network.ifr_flags & IFF_UP) {

1380

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

1381

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

1382

if(ret == -1){

1383

perror("ioctl SIOCSIFFLAGS");

1384

}

1739

1385

}

1740

if(geteuid() == 0){

1741

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

1742

if(ret == -1){

1743

perror("ioctl SIOCGIFFLAGS");

1744

} else if(network.ifr_flags & IFF_UP) {

1745

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

1746

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

1747

if(ret == -1){

1748

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1749

}

1750

}

1751

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

1752

if(ret == -1){

1753

perror("close");

1754

}

1755

/* Lower privileges permanently */

1756

errno = 0;

1757

ret = setuid(uid);

1758

if(ret == -1){

1759

perror("setuid");

1760

}

1386

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

1387

if(ret == -1){

1388

perror("close");

1761

1389

}

1762

1390

}

1763

1391

1806

1434

}

1807

1435

1808

1436

if(quit_now){

1809

sigemptyset(&old_sigterm_action.sa_mask);

1810

old_sigterm_action.sa_handler = SIG_DFL;

1811

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1812

&old_sigterm_action,

1813

NULL));

1437

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

1814

1438

if(ret == -1){

1815

1439

perror("sigaction");

1816

1440

}

1817

do {

1818

ret = raise(signal_received);

1819

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

1820

if(ret != 0){

1821

perror("raise");

1822

abort();

1823

}

1824

TEMP_FAILURE_RETRY(pause());

1441

raise(signal_received);

1825

1442

}

1826

1443

1827

1444

return exitcode;