/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

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

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

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

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

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

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

1099

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

1100

if(debug){

1101

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

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1120

}

1121

1122

899

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

1123

900

AvahiSServiceBrowser *sb = NULL;

1124

901

int error;

1126

903

intmax_t tmpmax;

1127

904

char *tmp;

1128

905

int exitcode = EXIT_SUCCESS;

1129

const char *interface = "";

906

const char *interface = "eth0";

1130

907

struct ifreq network;

1131

908

int sd = -1;

1132

909

bool take_down_interface = false;

1133

910

uid_t uid;

1134

911

gid_t gid;

912

char *connect_to = NULL;

1135

913

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

1136

914

bool tempdir_created = false;

1137

915

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1142

920

bool gpgme_initialized = false;

1143

921

float delay = 2.5f;

1144

922

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

923

struct sigaction old_sigterm_action;

1146

924

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1147

925

1148

uid = getuid();

1149

gid = getgid();

1150

1151

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

1152

errno = 0;

1153

ret = setgid(gid);

1154

if(ret == -1){

1155

perror("setgid");

1156

}

1157

1158

/* Lower user privileges (temporarily) */

1159

errno = 0;

1160

ret = seteuid(uid);

1161

if(ret == -1){

1162

perror("seteuid");

1163

}

1164

1165

if(quit_now){

1166

goto end;

1167

}

1168

1169

926

{

1170

927

struct argp_option options[] = {

1171

928

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

1200

957

.arg = "SECONDS",

1201

958

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

1202

959

.group = 2 },

1203

/*

1204

* These reproduce what we would get without ARGP_NO_HELP

1205

*/

1206

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

1207

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

1208

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

1209

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

1210

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

1211

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

1212

960

{ .name = NULL }

1213

961

};

1214

962

1215

963

error_t parse_opt(int key, char *arg,

1216

964

struct argp_state *state){

1217

errno = 0;

1218

965

switch(key){

1219

966

case 128: /* --debug */

1220

967

debug = true;

1236

983

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

1237

984

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

1238

985

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

1239

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

986

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

987

exit(EXIT_FAILURE);

1240

988

}

1241

989

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

1242

990

break;

1247

995

errno = 0;

1248

996

delay = strtof(arg, &tmp);

1249

997

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

1250

argp_error(state, "Bad delay");

998

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

999

exit(EXIT_FAILURE);

1251

1000

}

1252

1001

break;

1253

/*

1254

* These reproduce what we would get without ARGP_NO_HELP

1255

*/

1256

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

1257

argp_state_help(state, state->out_stream,

1258

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1259

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1260

case -3: /* --usage */

1261

argp_state_help(state, state->out_stream,

1262

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

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

1264

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

1265

exit(argp_err_exit_status);

1002

case ARGP_KEY_ARG:

1003

argp_usage(state);

1004

case ARGP_KEY_END:

1266

1005

break;

1267

1006

default:

1268

1007

return ARGP_ERR_UNKNOWN;

1269

1008

}

1270

return errno;

1009

return 0;

1271

1010

}

1272

1011

1273

1012

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

1274

1013

.args_doc = "",

1275

1014

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

1276

1015

" passwords from a Mandos server" };

1277

ret = argp_parse(&argp, argc, argv,

1278

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1279

switch(ret){

1280

case 0:

1281

break;

1282

case ENOMEM:

1283

default:

1284

errno = ret;

1285

perror("argp_parse");

1286

exitcode = EX_OSERR;

1287

goto end;

1288

case EINVAL:

1289

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;

1290

1020

goto end;

1291

1021

}

1292

1022

}

1294

1024

if(not debug){

1295

1025

avahi_set_log_function(empty_log);

1296

1026

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

}

1322

1027

1323

1028

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

1324

1029

from the signal handler */

1327

1032

mc.simple_poll = avahi_simple_poll_new();

1328

1033

if(mc.simple_poll == NULL){

1329

1034

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

1330

exitcode = EX_UNAVAILABLE;

1035

exitcode = EXIT_FAILURE;

1331

1036

goto end;

1332

1037

}

1333

1038

1335

1040

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

1336

1041

if(ret == -1){

1337

1042

perror("sigaddset");

1338

exitcode = EX_OSERR;

1043

exitcode = EXIT_FAILURE;

1339

1044

goto end;

1340

1045

}

1341

1046

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

1342

1047

if(ret == -1){

1343

1048

perror("sigaddset");

1344

exitcode = EX_OSERR;

1049

exitcode = EXIT_FAILURE;

1345

1050

goto end;

1346

1051

}

1347

1052

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

1348

1053

if(ret == -1){

1349

1054

perror("sigaddset");

1350

exitcode = EX_OSERR;

1351

goto end;

1352

}

1353

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

1354

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

1355

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

1356

*/

1357

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

1358

if(ret == -1){

1359

perror("sigaction");

1360

return EX_OSERR;

1361

}

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

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

1364

if(ret == -1){

1365

perror("sigaction");

1366

exitcode = EX_OSERR;

1367

goto end;

1368

}

1369

}

1370

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

1371

if(ret == -1){

1372

perror("sigaction");

1373

return EX_OSERR;

1374

}

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

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

1377

if(ret == -1){

1378

perror("sigaction");

1379

exitcode = EX_OSERR;

1380

goto end;

1381

}

1382

}

1383

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

1384

if(ret == -1){

1385

perror("sigaction");

1386

return EX_OSERR;

1387

}

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

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

1390

if(ret == -1){

1391

perror("sigaction");

1392

exitcode = EX_OSERR;

1393

goto end;

1394

}

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;

1395

1075

}

1396

1076

1397

1077

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

1398

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

1078

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

1399

1079

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

1080

if(if_index == 0){

1401

1081

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

1402

exitcode = EX_UNAVAILABLE;

1082

exitcode = EXIT_FAILURE;

1403

1083

goto end;

1404

1084

}

1405

1085

1407

1087

goto end;

1408

1088

}

1409

1089

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1417

1090

#ifdef __linux__

1418

1091

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

1092

messages to mess up the prompt */

1420

1093

ret = klogctl(8, NULL, 5);

1421

1094

bool restore_loglevel = true;

1422

1095

if(ret == -1){

1428

1101

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1102

if(sd < 0){

1430

1103

perror("socket");

1431

exitcode = EX_OSERR;

1104

exitcode = EXIT_FAILURE;

1432

1105

#ifdef __linux__

1433

1106

if(restore_loglevel){

1434

1107

ret = klogctl(7, NULL, 0);

1437

1110

}

1438

1111

}

1439

1112

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1446

1113

goto end;

1447

1114

}

1448

1115

strcpy(network.ifr_name, interface);

1457

1124

}

1458

1125

}

1459

1126

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1127

exitcode = EXIT_FAILURE;

1467

1128

goto end;

1468

1129

}

1469

1130

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

1472

1133

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

1473

1134

if(ret == -1){

1474

1135

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1136

perror("ioctl SIOCSIFFLAGS");

1137

exitcode = EXIT_FAILURE;

1477

1138

#ifdef __linux__

1478

1139

if(restore_loglevel){

1479

1140

ret = klogctl(7, NULL, 0);

1482

1143

}

1483

1144

}

1484

1145

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1491

1146

goto end;

1492

1147

}

1493

1148

}

1521

1176

}

1522

1177

}

1523

1178

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

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");

1539

1197

}

1540

1198

1541

1199

if(quit_now){

1545

1203

ret = init_gnutls_global(pubkey, seckey);

1546

1204

if(ret == -1){

1547

1205

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

1548

exitcode = EX_UNAVAILABLE;

1206

exitcode = EXIT_FAILURE;

1549

1207

goto end;

1550

1208

} else {

1551

1209

gnutls_initialized = true;

1568

1226

1569

1227

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

1570

1228

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

1571

exitcode = EX_UNAVAILABLE;

1229

exitcode = EXIT_FAILURE;

1572

1230

goto end;

1573

1231

} else {

1574

1232

gpgme_initialized = true;

1584

1242

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

1585

1243

if(address == NULL){

1586

1244

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

1587

exitcode = EX_USAGE;

1245

exitcode = EXIT_FAILURE;

1588

1246

goto end;

1589

1247

}

1590

1248

1598

1256

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

1599

1257

or tmpmax != (uint16_t)tmpmax){

1600

1258

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

1601

exitcode = EX_USAGE;

1259

exitcode = EXIT_FAILURE;

1602

1260

goto end;

1603

1261

}

1604

1262

1620

1278

if(quit_now){

1621

1279

goto end;

1622

1280

}

1623

1624

while(not quit_now){

1625

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

1626

if(quit_now or ret == 0){

1627

break;

1628

}

1629

sleep(15);

1630

};

1631

1632

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 {

1633

1286

exitcode = EXIT_SUCCESS;

1634

1287

}

1635

1636

1288

goto end;

1637

1289

}

1638

1290

1662

1314

if(mc.server == NULL){

1663

1315

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

1664

1316

avahi_strerror(error));

1665

exitcode = EX_UNAVAILABLE;

1317

exitcode = EXIT_FAILURE;

1666

1318

goto end;

1667

1319

}

1668

1320

1677

1329

if(sb == NULL){

1678

1330

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

1679

1331

avahi_strerror(avahi_server_errno(mc.server)));

1680

exitcode = EX_UNAVAILABLE;

1332

exitcode = EXIT_FAILURE;

1681

1333

goto end;

1682

1334

}

1683

1335

1721

1373

1722

1374

/* Take down the network interface */

1723

1375

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1376

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

1727

1377

if(ret == -1){

1728

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

}

1729

1385

}

1730

if(geteuid() == 0){

1731

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

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

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

1736

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

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1739

}

1740

}

1741

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

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

1750

}

1386

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

1387

if(ret == -1){

1388

perror("close");

1751

1389

}

1752

1390

}

1753

1391

1796

1434

}

1797

1435

1798

1436

if(quit_now){

1799

sigemptyset(&old_sigterm_action.sa_mask);

1800

old_sigterm_action.sa_handler = SIG_DFL;

1801

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1802

&old_sigterm_action,

1803

NULL));

1437

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

1804

1438

if(ret == -1){

1805

1439

perror("sigaction");

1806

1440

}

1807

do {

1808

ret = raise(signal_received);

1809

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

1810

if(ret != 0){

1811

perror("raise");

1812

abort();

1813

}

1814

TEMP_FAILURE_RETRY(pause());

1441

raise(signal_received);

1815

1442

}

1816

1443

1817

1444

return exitcode;