/mandos/release : revision 237.2.188

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() */

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

80

argp_parse(), ARGP_KEY_ARG,

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

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

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

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

249

256

return false;

250

257

}

251

258

252

return true;

259

return true;

253

260

}

254

261

255

262

/*

309

316

}

310

317

gpgme_recipient_t recipient;

311

318

recipient = result->recipients;

312

if(recipient){

313

while(recipient != NULL){

314

fprintf(stderr, "Public key algorithm: %s\n",

315

gpgme_pubkey_algo_name(recipient->pubkey_algo));

316

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

317

fprintf(stderr, "Secret key available: %s\n",

318

recipient->status == GPG_ERR_NO_SECKEY

319

? "No" : "Yes");

320

recipient = recipient->next;

321

}

319

while(recipient != NULL){

320

fprintf(stderr, "Public key algorithm: %s\n",

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

323

fprintf(stderr, "Secret key available: %s\n",

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

326

recipient = recipient->next;

322

327

}

323

328

}

324

329

}

476

481

static int init_gnutls_session(gnutls_session_t *session){

477

482

int ret;

478

483

/* GnuTLS session creation */

479

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);

480

490

if(ret != GNUTLS_E_SUCCESS){

481

491

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

482

492

safer_gnutls_strerror(ret));

484

494

485

495

{

486

496

const char *err;

487

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);

488

504

if(ret != GNUTLS_E_SUCCESS){

489

505

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

490

506

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

494

510

}

495

511

}

496

512

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

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);

499

521

if(ret != GNUTLS_E_SUCCESS){

500

522

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

501

523

safer_gnutls_strerror(ret));

504

526

}

505

527

506

528

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

530

510

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

532

520

541

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

521

542

AvahiIfIndex if_index,

522

543

int af){

523

int ret, tcp_sd;

544

int ret, tcp_sd = -1;

524

545

ssize_t sret;

525

546

union {

526

547

struct sockaddr_in in;

527

548

struct sockaddr_in6 in6;

528

549

} to;

529

550

char *buffer = NULL;

530

char *decrypted_buffer;

551

char *decrypted_buffer = NULL;

531

552

size_t buffer_length = 0;

532

553

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

554

size_t written;

535

int retval = 0;

555

int retval = -1;

536

556

gnutls_session_t session;

537

557

int pf; /* Protocol family */

538

558

559

errno = 0;

560

561

if(quit_now){

562

errno = EINTR;

563

return -1;

564

}

565

539

566

switch(af){

540

567

case AF_INET6:

541

568

pf = PF_INET6;

545

572

break;

546

573

default:

547

574

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

575

errno = EINVAL;

548

576

return -1;

549

577

}

550

578

560

588

561

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

590

if(tcp_sd < 0){

591

int e = errno;

563

592

perror("socket");

564

return -1;

593

errno = e;

594

goto mandos_end;

595

}

596

597

if(quit_now){

598

errno = EINTR;

599

goto mandos_end;

565

600

}

566

601

567

602

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

573

608

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

574

609

}

575

610

if(ret < 0 ){

611

int e = errno;

576

612

perror("inet_pton");

577

return -1;

613

errno = e;

614

goto mandos_end;

578

615

}

579

616

if(ret == 0){

617

int e = errno;

580

618

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

581

return -1;

619

errno = e;

620

goto mandos_end;

582

621

}

583

622

if(af == AF_INET6){

584

623

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

591

630

if(if_index == AVAHI_IF_UNSPEC){

592

631

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

593

632

" without a network interface\n");

594

return -1;

633

errno = EINVAL;

634

goto mandos_end;

595

635

}

596

636

/* Set the network interface number as scope */

597

637

to.in6.sin6_scope_id = (uint32_t)if_index;

602

642

-Wunreachable-code */

603

643

}

604

644

645

if(quit_now){

646

errno = EINTR;

647

goto mandos_end;

648

}

649

605

650

if(debug){

606

651

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

607

652

char interface[IF_NAMESIZE];

634

679

}

635

680

}

636

681

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

637

687

if(af == AF_INET6){

638

688

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

639

689

} else {

640

690

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

641

691

}

642

692

if(ret < 0){

693

int e = errno;

643

694

perror("connect");

644

return -1;

695

errno = e;

696

goto mandos_end;

697

}

698

699

if(quit_now){

700

errno = EINTR;

701

goto mandos_end;

645

702

}

646

703

647

704

const char *out = mandos_protocol_version;

651

708

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

652

709

out_size - written));

653

710

if(ret == -1){

711

int e = errno;

654

712

perror("write");

655

retval = -1;

713

errno = e;

656

714

goto mandos_end;

657

715

}

658

716

written += (size_t)ret;

666

724

break;

667

725

}

668

726

}

727

728

if(quit_now){

729

errno = EINTR;

730

goto mandos_end;

731

}

669

732

}

670

733

671

734

if(debug){

672

735

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

673

736

}

674

737

738

if(quit_now){

739

errno = EINTR;

740

goto mandos_end;

741

}

742

675

743

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

744

677

do{

745

if(quit_now){

746

errno = EINTR;

747

goto mandos_end;

748

}

749

750

do {

678

751

ret = gnutls_handshake(session);

752

if(quit_now){

753

errno = EINTR;

754

goto mandos_end;

755

}

679

756

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

680

757

681

758

if(ret != GNUTLS_E_SUCCESS){

683

760

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

684

761

gnutls_perror(ret);

685

762

}

686

retval = -1;

763

errno = EPROTO;

687

764

goto mandos_end;

688

765

}

689

766

695

772

}

696

773

697

774

while(true){

775

776

if(quit_now){

777

errno = EINTR;

778

goto mandos_end;

779

}

780

698

781

buffer_capacity = incbuffer(&buffer, buffer_length,

699

782

buffer_capacity);

700

783

if(buffer_capacity == 0){

784

int e = errno;

701

785

perror("incbuffer");

702

retval = -1;

786

errno = e;

787

goto mandos_end;

788

}

789

790

if(quit_now){

791

errno = EINTR;

703

792

goto mandos_end;

704

793

}

705

794

714

803

case GNUTLS_E_AGAIN:

715

804

break;

716

805

case GNUTLS_E_REHANDSHAKE:

717

do{

806

do {

718

807

ret = gnutls_handshake(session);

808

809

if(quit_now){

810

errno = EINTR;

811

goto mandos_end;

812

}

719

813

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

720

814

if(ret < 0){

721

815

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

722

816

gnutls_perror(ret);

723

retval = -1;

817

errno = EPROTO;

724

818

goto mandos_end;

725

819

}

726

820

break;

727

821

default:

728

822

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

729

823

" encrypted session with Mandos server\n");

730

retval = -1;

731

824

gnutls_bye(session, GNUTLS_SHUT_RDWR);

825

errno = EIO;

732

826

goto mandos_end;

733

827

}

734

828

} else {

740

834

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

741

835

}

742

836

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

837

if(quit_now){

838

errno = EINTR;

839

goto mandos_end;

840

}

841

842

do {

843

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

844

if(quit_now){

845

errno = EINTR;

846

goto mandos_end;

847

}

848

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

744

849

745

850

if(buffer_length > 0){

851

ssize_t decrypted_buffer_size;

746

852

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

853

buffer_length,

748

854

&decrypted_buffer);

749

855

if(decrypted_buffer_size >= 0){

856

750

857

written = 0;

751

858

while(written < (size_t) decrypted_buffer_size){

859

if(quit_now){

860

errno = EINTR;

861

goto mandos_end;

862

}

863

752

864

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

753

865

(size_t)decrypted_buffer_size - written,

754

866

stdout);

755

867

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

868

int e = errno;

756

869

if(debug){

757

870

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

758

871

strerror(errno));

759

872

}

760

retval = -1;

761

break;

873

errno = e;

874

goto mandos_end;

762

875

}

763

876

written += (size_t)ret;

764

877

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

878

retval = 0;

768

879

}

769

} else {

770

retval = -1;

771

880

}

772

881

773

882

/* Shutdown procedure */

774

883

775

884

mandos_end:

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

885

{

886

int e = errno;

887

free(decrypted_buffer);

888

free(buffer);

889

if(tcp_sd >= 0){

890

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

891

}

892

if(ret == -1){

893

if(e == 0){

894

e = errno;

895

}

896

perror("close");

897

}

898

gnutls_deinit(session);

899

if(quit_now){

900

e = EINTR;

901

retval = -1;

902

}

903

errno = e;

780

904

}

781

gnutls_deinit(session);

782

905

return retval;

783

906

}

784

907

801

924

/* Called whenever a service has been resolved successfully or

802

925

timed out */

803

926

927

if(quit_now){

928

return;

929

}

930

804

931

switch(event){

805

932

default:

806

933

case AVAHI_RESOLVER_FAILURE:

843

970

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

844

971

is removed from the LAN */

845

972

973

if(quit_now){

974

return;

975

}

976

846

977

switch(event){

847

978

default:

848

979

case AVAHI_BROWSER_FAILURE:

877

1008

}

878

1009

}

879

1010

880

sig_atomic_t quit_now = 0;

881

882

1011

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

883

static void handle_sigterm(__attribute__((unused)) int sig){

1012

static void handle_sigterm(int sig){

884

1013

if(quit_now){

885

1014

return;

886

1015

}

887

1016

quit_now = 1;

1017

signal_received = sig;

888

1018

int old_errno = errno;

889

1019

if(mc.simple_poll != NULL){

890

1020

avahi_simple_poll_quit(mc.simple_poll);

892

1022

errno = old_errno;

893

1023

}

894

1024

1025

/*

1026

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

1027

* corresponds to an acceptable network device.

1028

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

1029

*/

1030

int good_interface(const struct dirent *if_entry){

1031

ssize_t ssret;

1032

char *flagname = NULL;

1033

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

1034

if_entry->d_name);

1035

if(ret < 0){

1036

perror("asprintf");

1037

return 0;

1038

}

1039

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

1040

return 0;

1041

}

1042

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

1043

if(flags_fd == -1){

1044

perror("open");

1045

return 0;

1046

}

1047

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

1048

/* read line from flags_fd */

1049

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

1050

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

1051

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

1052

if(flagstring == NULL){

1053

perror("malloc");

1054

close(flags_fd);

1055

return 0;

1056

}

1057

while(to_read > 0){

1058

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

1059

(size_t)to_read));

1060

if(ssret == -1){

1061

perror("read");

1062

free(flagstring);

1063

close(flags_fd);

1064

return 0;

1065

}

1066

to_read -= ssret;

1067

if(ssret == 0){

1068

break;

1069

}

1070

}

1071

close(flags_fd);

1072

intmax_t tmpmax;

1073

char *tmp;

1074

errno = 0;

1075

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

1076

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

1077

and not (isspace(*tmp)))

1078

or tmpmax != (ifreq_flags)tmpmax){

1079

if(debug){

1080

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

1081

flagstring, if_entry->d_name);

1082

}

1083

free(flagstring);

1084

return 0;

1085

}

1086

free(flagstring);

1087

ifreq_flags flags = (ifreq_flags)tmpmax;

1088

/* Reject the loopback device */

1089

if(flags & IFF_LOOPBACK){

1090

if(debug){

1091

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

1092

if_entry->d_name);

1093

}

1094

return 0;

1095

}

1096

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

1097

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

1098

if(debug){

1099

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

1100

if_entry->d_name);

1101

}

1102

return 1;

1103

}

1104

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

1105

if(not (flags & IFF_BROADCAST)){

1106

if(debug){

1107

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

1108

if_entry->d_name);

1109

}

1110

return 0;

1111

}

1112

/* Accept this device */

1113

if(debug){

1114

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

1115

if_entry->d_name);

1116

}

1117

return 1;

1118

}

1119

895

1120

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

896

1121

AvahiSServiceBrowser *sb = NULL;

897

1122

int error;

899

1124

intmax_t tmpmax;

900

1125

char *tmp;

901

1126

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1127

const char *interface = "";

903

1128

struct ifreq network;

904

int sd;

1129

int sd = -1;

1130

bool take_down_interface = false;

905

1131

uid_t uid;

906

1132

gid_t gid;

907

char *connect_to = NULL;

908

1133

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

909

1134

bool tempdir_created = false;

910

1135

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

915

1140

bool gpgme_initialized = false;

916

1141

float delay = 2.5f;

917

1142

918

struct sigaction old_sigterm_action;

1143

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1144

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1145

1146

uid = getuid();

1147

gid = getgid();

1148

1149

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

1150

errno = 0;

1151

ret = setgid(gid);

1152

if(ret == -1){

1153

perror("setgid");

1154

}

1155

1156

/* Lower user privileges (temporarily) */

1157

errno = 0;

1158

ret = seteuid(uid);

1159

if(ret == -1){

1160

perror("seteuid");

1161

}

1162

1163

if(quit_now){

1164

goto end;

1165

}

1166

921

1167

{

922

1168

struct argp_option options[] = {

923

1169

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

952

1198

.arg = "SECONDS",

953

1199

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

954

1200

.group = 2 },

1201

/*

1202

* These reproduce what we would get without ARGP_NO_HELP

1203

*/

1204

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

1205

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

1206

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

1207

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

1208

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

1209

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

955

1210

{ .name = NULL }

956

1211

};

957

1212

958

1213

error_t parse_opt(int key, char *arg,

959

1214

struct argp_state *state){

1215

errno = 0;

960

1216

switch(key){

961

1217

case 128: /* --debug */

962

1218

debug = true;

978

1234

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

979

1235

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

980

1236

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

981

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

982

exit(EXIT_FAILURE);

1237

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

983

1238

}

984

1239

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

985

1240

break;

990

1245

errno = 0;

991

1246

delay = strtof(arg, &tmp);

992

1247

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

993

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

994

exit(EXIT_FAILURE);

1248

argp_error(state, "Bad delay");

995

1249

}

996

1250

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1251

/*

1252

* These reproduce what we would get without ARGP_NO_HELP

1253

*/

1254

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

1255

argp_state_help(state, state->out_stream,

1256

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1257

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1258

case -3: /* --usage */

1259

argp_state_help(state, state->out_stream,

1260

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1261

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

1262

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

1263

exit(argp_err_exit_status);

1000

1264

break;

1001

1265

default:

1002

1266

return ARGP_ERR_UNKNOWN;

1003

1267

}

1004

return 0;

1268

return errno;

1005

1269

}

1006

1270

1007

1271

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

1008

1272

.args_doc = "",

1009

1273

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

1010

1274

" passwords from a Mandos server" };

1011

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

1012

if(ret == ARGP_ERR_UNKNOWN){

1013

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

1014

exitcode = EXIT_FAILURE;

1275

ret = argp_parse(&argp, argc, argv,

1276

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1277

switch(ret){

1278

case 0:

1279

break;

1280

case ENOMEM:

1281

default:

1282

errno = ret;

1283

perror("argp_parse");

1284

exitcode = EX_OSERR;

1285

goto end;

1286

case EINVAL:

1287

exitcode = EX_USAGE;

1015

1288

goto end;

1016

1289

}

1017

1290

}

1019

1292

if(not debug){

1020

1293

avahi_set_log_function(empty_log);

1021

1294

}

1295

1296

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

1297

struct dirent **direntries;

1298

ret = scandir(sys_class_net, &direntries, good_interface,

1299

alphasort);

1300

if(ret >= 1){

1301

/* Pick the first good interface */

1302

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

1303

if(debug){

1304

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

1305

}

1306

if(interface == NULL){

1307

perror("malloc");

1308

free(direntries);

1309

exitcode = EXIT_FAILURE;

1310

goto end;

1311

}

1312

free(direntries);

1313

} else {

1314

free(direntries);

1315

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

1316

exitcode = EXIT_FAILURE;

1317

goto end;

1318

}

1319

}

1022

1320

1023

1321

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

1024

1322

from the signal handler */

1027

1325

mc.simple_poll = avahi_simple_poll_new();

1028

1326

if(mc.simple_poll == NULL){

1029

1327

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

1030

exitcode = EXIT_FAILURE;

1328

exitcode = EX_UNAVAILABLE;

1031

1329

goto end;

1032

1330

}

1033

1331

1035

1333

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

1036

1334

if(ret == -1){

1037

1335

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1336

exitcode = EX_OSERR;

1039

1337

goto end;

1040

1338

}

1041

1339

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

1042

1340

if(ret == -1){

1043

1341

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1342

exitcode = EX_OSERR;

1045

1343

goto end;

1046

1344

}

1047

1345

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

1048

1346

if(ret == -1){

1049

1347

perror("sigaddset");

1050

exitcode = EXIT_FAILURE;

1051

goto end;

1052

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

1348

exitcode = EX_OSERR;

1349

goto end;

1350

}

1351

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

1352

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

1353

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

1354

*/

1355

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

1356

if(ret == -1){

1357

perror("sigaction");

1358

return EX_OSERR;

1359

}

1360

if(old_sigterm_action.sa_handler != SIG_IGN){

1361

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

1362

if(ret == -1){

1363

perror("sigaction");

1364

exitcode = EX_OSERR;

1365

goto end;

1366

}

1367

}

1368

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

1369

if(ret == -1){

1370

perror("sigaction");

1371

return EX_OSERR;

1372

}

1373

if(old_sigterm_action.sa_handler != SIG_IGN){

1374

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

1375

if(ret == -1){

1376

perror("sigaction");

1377

exitcode = EX_OSERR;

1378

goto end;

1379

}

1380

}

1381

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

1382

if(ret == -1){

1383

perror("sigaction");

1384

return EX_OSERR;

1385

}

1386

if(old_sigterm_action.sa_handler != SIG_IGN){

1387

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

1388

if(ret == -1){

1389

perror("sigaction");

1390

exitcode = EX_OSERR;

1391

goto end;

1392

}

1393

}

1059

1394

1060

1395

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

1061

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

1396

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

1397

if_index = (AvahiIfIndex) if_nametoindex(interface);

1398

if(if_index == 0){

1399

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

1400

exitcode = EX_UNAVAILABLE;

1401

goto end;

1402

}

1403

1404

if(quit_now){

1405

goto end;

1406

}

1407

1408

/* Re-raise priviliges */

1409

errno = 0;

1410

ret = seteuid(0);

1411

if(ret == -1){

1412

perror("seteuid");

1413

}

1414

1062

1415

#ifdef __linux__

1063

1416

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1417

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

1065

1418

ret = klogctl(8, NULL, 5);

1066

1419

bool restore_loglevel = true;

1067

1420

if(ret == -1){

1073

1426

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

1427

if(sd < 0){

1075

1428

perror("socket");

1076

exitcode = EXIT_FAILURE;

1429

exitcode = EX_OSERR;

1077

1430

#ifdef __linux__

1078

1431

if(restore_loglevel){

1079

1432

ret = klogctl(7, NULL, 0);

1082

1435

}

1083

1436

}

1084

1437

#endif /* __linux__ */

1438

/* Lower privileges */

1439

errno = 0;

1440

ret = seteuid(uid);

1441

if(ret == -1){

1442

perror("seteuid");

1443

}

1085

1444

goto end;

1086

1445

}

1087

1446

strcpy(network.ifr_name, interface);

1096

1455

}

1097

1456

}

1098

1457

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1458

exitcode = EX_OSERR;

1459

/* Lower privileges */

1460

errno = 0;

1461

ret = seteuid(uid);

1462

if(ret == -1){

1463

perror("seteuid");

1464

}

1100

1465

goto end;

1101

1466

}

1102

1467

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

1103

1468

network.ifr_flags |= IFF_UP;

1469

take_down_interface = true;

1104

1470

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

1105

1471

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1472

take_down_interface = false;

1473

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1474

exitcode = EX_OSERR;

1108

1475

#ifdef __linux__

1109

1476

if(restore_loglevel){

1110

1477

ret = klogctl(7, NULL, 0);

1113

1480

}

1114

1481

}

1115

1482

#endif /* __linux__ */

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

1486

if(ret == -1){

1487

perror("seteuid");

1488

}

1116

1489

goto end;

1117

1490

}

1118

1491

}

1130

1503

perror("nanosleep");

1131

1504

}

1132

1505

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1506

if(not take_down_interface){

1507

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

1508

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

1509

if(ret == -1){

1510

perror("close");

1511

}

1136

1512

}

1137

1513

#ifdef __linux__

1138

1514

if(restore_loglevel){

1143

1519

}

1144

1520

}

1145

1521

#endif /* __linux__ */

1146

}

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

errno = 0;

1152

setgid(gid);

1153

if(ret == -1){

1154

perror("setgid");

1155

}

1156

1157

ret = setuid(uid);

1158

if(ret == -1){

1159

perror("setuid");

1522

/* Lower privileges */

1523

errno = 0;

1524

if(take_down_interface){

1525

/* Lower privileges */

1526

ret = seteuid(uid);

1527

if(ret == -1){

1528

perror("seteuid");

1529

}

1530

} else {

1531

/* Lower privileges permanently */

1532

ret = setuid(uid);

1533

if(ret == -1){

1534

perror("setuid");

1535

}

1536

}

1537

}

1538

1539

if(quit_now){

1540

goto end;

1160

1541

}

1161

1542

1162

1543

ret = init_gnutls_global(pubkey, seckey);

1163

1544

if(ret == -1){

1164

1545

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

1165

exitcode = EXIT_FAILURE;

1546

exitcode = EX_UNAVAILABLE;

1166

1547

goto end;

1167

1548

} else {

1168

1549

gnutls_initialized = true;

1169

1550

}

1170

1551

1552

if(quit_now){

1553

goto end;

1554

}

1555

1556

tempdir_created = true;

1171

1557

if(mkdtemp(tempdir) == NULL){

1558

tempdir_created = false;

1172

1559

perror("mkdtemp");

1173

1560

goto end;

1174

1561

}

1175

tempdir_created = true;

1562

1563

if(quit_now){

1564

goto end;

1565

}

1176

1566

1177

1567

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

1178

1568

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

1179

exitcode = EXIT_FAILURE;

1569

exitcode = EX_UNAVAILABLE;

1180

1570

goto end;

1181

1571

} else {

1182

1572

gpgme_initialized = true;

1183

1573

}

1184

1574

1185

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

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

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

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

1575

if(quit_now){

1576

goto end;

1192

1577

}

1193

1578

1194

1579

if(connect_to != NULL){

1197

1582

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

1198

1583

if(address == NULL){

1199

1584

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1585

exitcode = EX_USAGE;

1586

goto end;

1587

}

1588

1589

if(quit_now){

1590

goto end;

1591

}

1592

1203

1593

uint16_t port;

1204

1594

errno = 0;

1205

1595

tmpmax = strtoimax(address+1, &tmp, 10);

1206

1596

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

1207

1597

or tmpmax != (uint16_t)tmpmax){

1208

1598

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1599

exitcode = EX_USAGE;

1600

goto end;

1601

}

1602

1603

if(quit_now){

1604

goto end;

1605

}

1606

1212

1607

port = (uint16_t)tmpmax;

1213

1608

*address = '\0';

1214

1609

address = connect_to;

1219

1614

} else {

1220

1615

af = AF_INET;

1221

1616

}

1617

1618

if(quit_now){

1619

goto end;

1620

}

1621

1222

1622

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

1223

1623

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1624

switch(errno){

1625

case ENETUNREACH:

1626

case EHOSTDOWN:

1627

case EHOSTUNREACH:

1628

exitcode = EX_NOHOST;

1629

break;

1630

case EINVAL:

1631

exitcode = EX_USAGE;

1632

break;

1633

case EIO:

1634

exitcode = EX_IOERR;

1635

break;

1636

case EPROTO:

1637

exitcode = EX_PROTOCOL;

1638

break;

1639

default:

1640

exitcode = EX_OSERR;

1641

break;

1642

}

1225

1643

} else {

1226

1644

exitcode = EXIT_SUCCESS;

1227

1645

}

1228

1646

goto end;

1229

1647

}

1230

1648

1649

if(quit_now){

1650

goto end;

1651

}

1652

1231

1653

{

1232

1654

AvahiServerConfig config;

1233

1655

/* Do not publish any local Zeroconf records */

1250

1672

if(mc.server == NULL){

1251

1673

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

1252

1674

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

1675

exitcode = EX_UNAVAILABLE;

1676

goto end;

1677

}

1678

1679

if(quit_now){

1254

1680

goto end;

1255

1681

}

1256

1682

1261

1687

if(sb == NULL){

1262

1688

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

1263

1689

avahi_strerror(avahi_server_errno(mc.server)));

1264

exitcode = EXIT_FAILURE;

1690

exitcode = EX_UNAVAILABLE;

1691

goto end;

1692

}

1693

1694

if(quit_now){

1265

1695

goto end;

1266

1696

}

1267

1697

1299

1729

gpgme_release(mc.ctx);

1300

1730

}

1301

1731

1732

/* Take down the network interface */

1733

if(take_down_interface){

1734

/* Re-raise priviliges */

1735

errno = 0;

1736

ret = seteuid(0);

1737

if(ret == -1){

1738

perror("seteuid");

1739

}

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

}

1761

}

1762

}

1763

1302

1764

/* Removes the temp directory used by GPGME */

1303

1765

if(tempdir_created){

1304

1766

DIR *d;

1343

1805

}

1344

1806

}

1345

1807

1808

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));

1814

if(ret == -1){

1815

perror("sigaction");

1816

}

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());

1825

}

1826

1346

1827

return exitcode;

1347

1828

}