/mandos/release : revision 237.2.84

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() */

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

80

argp_parse(), ARGP_KEY_ARG,

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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 */

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

87

85

88

86

#ifdef __linux__

89

87

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

144

142

.dh_bits = 1024, .priority = "SECURE256"

145

143

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

146

144

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

150

145

/*

151

146

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

152

147

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

169

164

*/

170

165

static bool init_gpgme(const char *seckey,

171

166

const char *pubkey, const char *tempdir){

167

int ret;

172

168

gpgme_error_t rc;

173

169

gpgme_engine_info_t engine_info;

174

170

177

173

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

178

174

*/

179

175

bool import_key(const char *filename){

180

int ret;

181

176

int fd;

182

177

gpgme_data_t pgp_data;

183

178

254

249

return false;

255

250

}

256

251

257

return true;

252

return true;

258

253

}

259

254

260

255

/*

314

309

}

315

310

gpgme_recipient_t recipient;

316

311

recipient = result->recipients;

317

while(recipient != NULL){

318

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

319

gpgme_pubkey_algo_name(recipient->pubkey_algo));

320

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

321

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

322

recipient->status == GPG_ERR_NO_SECKEY

323

? "No" : "Yes");

324

recipient = recipient->next;

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

}

325

322

}

326

323

}

327

324

}

479

476

static int init_gnutls_session(gnutls_session_t *session){

480

477

int ret;

481

478

/* GnuTLS session creation */

482

do {

483

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

487

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

479

ret = gnutls_init(session, GNUTLS_SERVER);

488

480

if(ret != GNUTLS_E_SUCCESS){

489

481

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

490

482

safer_gnutls_strerror(ret));

492

484

493

485

{

494

486

const char *err;

495

do {

496

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

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

501

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

487

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

502

488

if(ret != GNUTLS_E_SUCCESS){

503

489

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

504

490

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

508

494

}

509

495

}

510

496

511

do {

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

514

if(quit_now){

515

gnutls_deinit(*session);

516

return -1;

517

}

518

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

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

519

499

if(ret != GNUTLS_E_SUCCESS){

520

500

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

521

501

safer_gnutls_strerror(ret));

524

504

}

525

505

526

506

/* ignore client certificate if any. */

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

528

509

529

510

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

511

539

520

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

540

521

AvahiIfIndex if_index,

541

522

int af){

542

int ret, tcp_sd = -1;

523

int ret, tcp_sd;

543

524

ssize_t sret;

544

525

union {

545

526

struct sockaddr_in in;

546

527

struct sockaddr_in6 in6;

547

528

} to;

548

529

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

530

char *decrypted_buffer;

550

531

size_t buffer_length = 0;

551

532

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

552

534

size_t written;

553

int retval = -1;

535

int retval = 0;

554

536

gnutls_session_t session;

555

537

int pf; /* Protocol family */

556

538

557

errno = 0;

558

559

if(quit_now){

560

errno = EINTR;

561

return -1;

562

}

563

564

539

switch(af){

565

540

case AF_INET6:

566

541

pf = PF_INET6;

570

545

break;

571

546

default:

572

547

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

573

errno = EINVAL;

574

548

return -1;

575

549

}

576

550

586

560

587

561

tcp_sd = socket(pf, SOCK_STREAM, 0);

588

562

if(tcp_sd < 0){

589

int e = errno;

590

563

perror("socket");

591

errno = e;

592

goto mandos_end;

593

}

594

595

if(quit_now){

596

errno = EINTR;

597

goto mandos_end;

564

return -1;

598

565

}

599

566

600

567

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

601

568

if(af == AF_INET6){

602

to.in6.sin6_family = (sa_family_t)af;

569

to.in6.sin6_family = (uint16_t)af;

603

570

ret = inet_pton(af, ip, &to.in6.sin6_addr);

604

571

} else { /* IPv4 */

605

572

to.in.sin_family = (sa_family_t)af;

606

573

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

607

574

}

608

575

if(ret < 0 ){

609

int e = errno;

610

576

perror("inet_pton");

611

errno = e;

612

goto mandos_end;

577

return -1;

613

578

}

614

579

if(ret == 0){

615

int e = errno;

616

580

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

617

errno = e;

618

goto mandos_end;

581

return -1;

619

582

}

620

583

if(af == AF_INET6){

621

584

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

628

591

if(if_index == AVAHI_IF_UNSPEC){

629

592

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

630

593

" without a network interface\n");

631

errno = EINVAL;

632

goto mandos_end;

594

return -1;

633

595

}

634

596

/* Set the network interface number as scope */

635

597

to.in6.sin6_scope_id = (uint32_t)if_index;

640

602

-Wunreachable-code */

641

603

}

642

604

643

if(quit_now){

644

errno = EINTR;

645

goto mandos_end;

646

}

647

648

605

if(debug){

649

606

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

650

607

char interface[IF_NAMESIZE];

677

634

}

678

635

}

679

636

680

if(quit_now){

681

errno = EINTR;

682

goto mandos_end;

683

}

684

685

637

if(af == AF_INET6){

686

638

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

687

639

} else {

688

640

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

689

641

}

690

642

if(ret < 0){

691

int e = errno;

692

643

perror("connect");

693

errno = e;

694

goto mandos_end;

695

}

696

697

if(quit_now){

698

errno = EINTR;

699

goto mandos_end;

644

return -1;

700

645

}

701

646

702

647

const char *out = mandos_protocol_version;

706

651

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

707

652

out_size - written));

708

653

if(ret == -1){

709

int e = errno;

710

654

perror("write");

711

errno = e;

655

retval = -1;

712

656

goto mandos_end;

713

657

}

714

658

written += (size_t)ret;

722

666

break;

723

667

}

724

668

}

725

726

if(quit_now){

727

errno = EINTR;

728

goto mandos_end;

729

}

730

669

}

731

670

732

671

if(debug){

733

672

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

734

673

}

735

674

736

if(quit_now){

737

errno = EINTR;

738

goto mandos_end;

739

}

740

741

675

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

742

676

743

if(quit_now){

744

errno = EINTR;

745

goto mandos_end;

746

}

747

748

do {

677

do{

749

678

ret = gnutls_handshake(session);

750

if(quit_now){

751

errno = EINTR;

752

goto mandos_end;

753

}

754

679

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

755

680

756

681

if(ret != GNUTLS_E_SUCCESS){

758

683

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

759

684

gnutls_perror(ret);

760

685

}

761

errno = EPROTO;

686

retval = -1;

762

687

goto mandos_end;

763

688

}

764

689

770

695

}

771

696

772

697

while(true){

773

774

if(quit_now){

775

errno = EINTR;

776

goto mandos_end;

777

}

778

779

698

buffer_capacity = incbuffer(&buffer, buffer_length,

780

699

buffer_capacity);

781

700

if(buffer_capacity == 0){

782

int e = errno;

783

701

perror("incbuffer");

784

errno = e;

785

goto mandos_end;

786

}

787

788

if(quit_now){

789

errno = EINTR;

702

retval = -1;

790

703

goto mandos_end;

791

704

}

792

705

801

714

case GNUTLS_E_AGAIN:

802

715

break;

803

716

case GNUTLS_E_REHANDSHAKE:

804

do {

717

do{

805

718

ret = gnutls_handshake(session);

806

807

if(quit_now){

808

errno = EINTR;

809

goto mandos_end;

810

}

811

719

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

812

720

if(ret < 0){

813

721

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

814

722

gnutls_perror(ret);

815

errno = EPROTO;

723

retval = -1;

816

724

goto mandos_end;

817

725

}

818

726

break;

819

727

default:

820

728

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

821

729

" encrypted session with Mandos server\n");

730

retval = -1;

822

731

gnutls_bye(session, GNUTLS_SHUT_RDWR);

823

errno = EIO;

824

732

goto mandos_end;

825

733

}

826

734

} else {

832

740

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

833

741

}

834

742

835

if(quit_now){

836

errno = EINTR;

837

goto mandos_end;

838

}

839

840

do {

841

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

842

if(quit_now){

843

errno = EINTR;

844

goto mandos_end;

845

}

846

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

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

847

744

848

745

if(buffer_length > 0){

849

ssize_t decrypted_buffer_size;

850

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

851

747

buffer_length,

852

748

&decrypted_buffer);

853

749

if(decrypted_buffer_size >= 0){

854

855

750

written = 0;

856

751

while(written < (size_t) decrypted_buffer_size){

857

if(quit_now){

858

errno = EINTR;

859

goto mandos_end;

860

}

861

862

752

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

863

753

(size_t)decrypted_buffer_size - written,

864

754

stdout);

865

755

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

866

int e = errno;

867

756

if(debug){

868

757

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

869

758

strerror(errno));

870

759

}

871

errno = e;

872

goto mandos_end;

760

retval = -1;

761

break;

873

762

}

874

763

written += (size_t)ret;

875

764

}

876

retval = 0;

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

877

768

}

769

} else {

770

retval = -1;

878

771

}

879

772

880

773

/* Shutdown procedure */

881

774

882

775

mandos_end:

883

{

884

int e = errno;

885

free(decrypted_buffer);

886

free(buffer);

887

if(tcp_sd >= 0){

888

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

889

}

890

if(ret == -1){

891

if(e == 0){

892

e = errno;

893

}

894

perror("close");

895

}

896

gnutls_deinit(session);

897

if(quit_now){

898

e = EINTR;

899

retval = -1;

900

}

901

errno = e;

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

902

780

}

781

gnutls_deinit(session);

903

782

return retval;

904

783

}

905

784

922

801

/* Called whenever a service has been resolved successfully or

923

802

timed out */

924

803

925

if(quit_now){

926

return;

927

}

928

929

804

switch(event){

930

805

default:

931

806

case AVAHI_RESOLVER_FAILURE:

968

843

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

969

844

is removed from the LAN */

970

845

971

if(quit_now){

972

return;

973

}

974

975

846

switch(event){

976

847

default:

977

848

case AVAHI_BROWSER_FAILURE:

1006

877

}

1007

878

}

1008

879

880

sig_atomic_t quit_now = 0;

881

1009

882

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

1010

static void handle_sigterm(int sig){

883

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

1011

884

if(quit_now){

1012

885

return;

1013

886

}

1014

887

quit_now = 1;

1015

signal_received = sig;

1016

888

int old_errno = errno;

1017

889

if(mc.simple_poll != NULL){

1018

890

avahi_simple_poll_quit(mc.simple_poll);

1029

901

int exitcode = EXIT_SUCCESS;

1030

902

const char *interface = "eth0";

1031

903

struct ifreq network;

1032

int sd = -1;

1033

bool take_down_interface = false;

904

int sd;

1034

905

uid_t uid;

1035

906

gid_t gid;

1036

907

char *connect_to = NULL;

1044

915

bool gpgme_initialized = false;

1045

916

float delay = 2.5f;

1046

917

1047

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

struct sigaction old_sigterm_action;

1048

919

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1049

920

1050

uid = getuid();

1051

gid = getgid();

1052

1053

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

1054

errno = 0;

1055

ret = setgid(gid);

1056

if(ret == -1){

1057

perror("setgid");

1058

}

1059

1060

/* Lower user privileges (temporarily) */

1061

errno = 0;

1062

ret = seteuid(uid);

1063

if(ret == -1){

1064

perror("seteuid");

1065

}

1066

1067

if(quit_now){

1068

goto end;

1069

}

1070

1071

921

{

1072

922

struct argp_option options[] = {

1073

923

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

1102

952

.arg = "SECONDS",

1103

953

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

1104

954

.group = 2 },

1105

/*

1106

* These reproduce what we would get without ARGP_NO_HELP

1107

*/

1108

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

1109

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

1110

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

1111

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

1112

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

1113

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

1114

955

{ .name = NULL }

1115

956

};

1116

957

1117

958

error_t parse_opt(int key, char *arg,

1118

959

struct argp_state *state){

1119

errno = 0;

1120

960

switch(key){

1121

961

case 128: /* --debug */

1122

962

debug = true;

1138

978

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

1139

979

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

1140

980

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

1141

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

981

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

982

exit(EXIT_FAILURE);

1142

983

}

1143

984

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

1144

985

break;

1149

990

errno = 0;

1150

991

delay = strtof(arg, &tmp);

1151

992

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

1152

argp_error(state, "Bad delay");

993

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

994

exit(EXIT_FAILURE);

1153

995

}

1154

996

break;

1155

/*

1156

* These reproduce what we would get without ARGP_NO_HELP

1157

*/

1158

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

1159

argp_state_help(state, state->out_stream,

1160

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1161

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1162

case -3: /* --usage */

1163

argp_state_help(state, state->out_stream,

1164

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1165

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

1166

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

1167

exit(argp_err_exit_status);

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1168

1000

break;

1169

1001

default:

1170

1002

return ARGP_ERR_UNKNOWN;

1171

1003

}

1172

return errno;

1004

return 0;

1173

1005

}

1174

1006

1175

1007

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

1176

1008

.args_doc = "",

1177

1009

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

1178

1010

" passwords from a Mandos server" };

1179

ret = argp_parse(&argp, argc, argv,

1180

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1181

switch(ret){

1182

case 0:

1183

break;

1184

case ENOMEM:

1185

default:

1186

errno = ret;

1187

perror("argp_parse");

1188

exitcode = EX_OSERR;

1189

goto end;

1190

case EINVAL:

1191

exitcode = EX_USAGE;

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;

1192

1015

goto end;

1193

1016

}

1194

1017

}

1204

1027

mc.simple_poll = avahi_simple_poll_new();

1205

1028

if(mc.simple_poll == NULL){

1206

1029

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

1207

exitcode = EX_UNAVAILABLE;

1030

exitcode = EXIT_FAILURE;

1208

1031

goto end;

1209

1032

}

1210

1033

1212

1035

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

1213

1036

if(ret == -1){

1214

1037

perror("sigaddset");

1215

exitcode = EX_OSERR;

1038

exitcode = EXIT_FAILURE;

1216

1039

goto end;

1217

1040

}

1218

1041

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

1219

1042

if(ret == -1){

1220

1043

perror("sigaddset");

1221

exitcode = EX_OSERR;

1044

exitcode = EXIT_FAILURE;

1222

1045

goto end;

1223

1046

}

1224

1047

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

1225

1048

if(ret == -1){

1226

1049

perror("sigaddset");

1227

exitcode = EX_OSERR;

1228

goto end;

1229

}

1230

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

1231

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

1232

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

1233

*/

1234

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

1235

if(ret == -1){

1236

perror("sigaction");

1237

return EX_OSERR;

1238

}

1239

if(old_sigterm_action.sa_handler != SIG_IGN){

1240

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

1241

if(ret == -1){

1242

perror("sigaction");

1243

exitcode = EX_OSERR;

1244

goto end;

1245

}

1246

}

1247

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

1248

if(ret == -1){

1249

perror("sigaction");

1250

return EX_OSERR;

1251

}

1252

if(old_sigterm_action.sa_handler != SIG_IGN){

1253

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

1254

if(ret == -1){

1255

perror("sigaction");

1256

exitcode = EX_OSERR;

1257

goto end;

1258

}

1259

}

1260

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

1261

if(ret == -1){

1262

perror("sigaction");

1263

return EX_OSERR;

1264

}

1265

if(old_sigterm_action.sa_handler != SIG_IGN){

1266

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

1267

if(ret == -1){

1268

perror("sigaction");

1269

exitcode = EX_OSERR;

1270

goto end;

1271

}

1272

}

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

}

1273

1059

1274

1060

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

1275

1061

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

1276

if_index = (AvahiIfIndex) if_nametoindex(interface);

1277

if(if_index == 0){

1278

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

1279

exitcode = EX_UNAVAILABLE;

1280

goto end;

1281

}

1282

1283

if(quit_now){

1284

goto end;

1285

}

1286

1287

/* Re-raise priviliges */

1288

errno = 0;

1289

ret = seteuid(0);

1290

if(ret == -1){

1291

perror("seteuid");

1292

}

1293

1294

1062

#ifdef __linux__

1295

1063

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1296

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

1064

messages to mess up the prompt */

1297

1065

ret = klogctl(8, NULL, 5);

1298

1066

bool restore_loglevel = true;

1299

1067

if(ret == -1){

1305

1073

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1306

1074

if(sd < 0){

1307

1075

perror("socket");

1308

exitcode = EX_OSERR;

1076

exitcode = EXIT_FAILURE;

1309

1077

#ifdef __linux__

1310

1078

if(restore_loglevel){

1311

1079

ret = klogctl(7, NULL, 0);

1314

1082

}

1315

1083

}

1316

1084

#endif /* __linux__ */

1317

/* Lower privileges */

1318

errno = 0;

1319

ret = seteuid(uid);

1320

if(ret == -1){

1321

perror("seteuid");

1322

}

1323

1085

goto end;

1324

1086

}

1325

1087

strcpy(network.ifr_name, interface);

1334

1096

}

1335

1097

}

1336

1098

#endif /* __linux__ */

1337

exitcode = EX_OSERR;

1338

/* Lower privileges */

1339

errno = 0;

1340

ret = seteuid(uid);

1341

if(ret == -1){

1342

perror("seteuid");

1343

}

1099

exitcode = EXIT_FAILURE;

1344

1100

goto end;

1345

1101

}

1346

1102

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

1347

1103

network.ifr_flags |= IFF_UP;

1348

take_down_interface = true;

1349

1104

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

1350

1105

if(ret == -1){

1351

take_down_interface = false;

1352

1106

perror("ioctl SIOCSIFFLAGS");

1353

exitcode = EX_OSERR;

1107

exitcode = EXIT_FAILURE;

1354

1108

#ifdef __linux__

1355

1109

if(restore_loglevel){

1356

1110

ret = klogctl(7, NULL, 0);

1359

1113

}

1360

1114

}

1361

1115

#endif /* __linux__ */

1362

/* Lower privileges */

1363

errno = 0;

1364

ret = seteuid(uid);

1365

if(ret == -1){

1366

perror("seteuid");

1367

}

1368

1116

goto end;

1369

1117

}

1370

1118

}

1382

1130

perror("nanosleep");

1383

1131

}

1384

1132

}

1385

if(not take_down_interface){

1386

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

1387

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

1388

if(ret == -1){

1389

perror("close");

1390

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1391

1136

}

1392

1137

#ifdef __linux__

1393

1138

if(restore_loglevel){

1398

1143

}

1399

1144

}

1400

1145

#endif /* __linux__ */

1401

/* Lower privileges */

1402

errno = 0;

1403

if(take_down_interface){

1404

/* Lower privileges */

1405

ret = seteuid(uid);

1406

if(ret == -1){

1407

perror("seteuid");

1408

}

1409

} else {

1410

/* Lower privileges permanently */

1411

ret = setuid(uid);

1412

if(ret == -1){

1413

perror("setuid");

1414

}

1415

}

1416

}

1417

1418

if(quit_now){

1419

goto end;

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");

1420

1160

}

1421

1161

1422

1162

ret = init_gnutls_global(pubkey, seckey);

1423

1163

if(ret == -1){

1424

1164

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

1425

exitcode = EX_UNAVAILABLE;

1165

exitcode = EXIT_FAILURE;

1426

1166

goto end;

1427

1167

} else {

1428

1168

gnutls_initialized = true;

1429

1169

}

1430

1170

1431

if(quit_now){

1432

goto end;

1433

}

1434

1435

tempdir_created = true;

1436

1171

if(mkdtemp(tempdir) == NULL){

1437

tempdir_created = false;

1438

1172

perror("mkdtemp");

1439

1173

goto end;

1440

1174

}

1441

1442

if(quit_now){

1443

goto end;

1444

}

1175

tempdir_created = true;

1445

1176

1446

1177

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

1447

1178

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

1448

exitcode = EX_UNAVAILABLE;

1179

exitcode = EXIT_FAILURE;

1449

1180

goto end;

1450

1181

} else {

1451

1182

gpgme_initialized = true;

1452

1183

}

1453

1184

1454

if(quit_now){

1455

goto end;

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

}

1456

1192

}

1457

1193

1458

1194

if(connect_to != NULL){

1461

1197

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

1462

1198

if(address == NULL){

1463

1199

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

1464

exitcode = EX_USAGE;

1465

goto end;

1466

}

1467

1468

if(quit_now){

1469

goto end;

1470

}

1471

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1472

1203

uint16_t port;

1473

1204

errno = 0;

1474

1205

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

1475

1206

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

1476

1207

or tmpmax != (uint16_t)tmpmax){

1477

1208

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

1478

exitcode = EX_USAGE;

1479

goto end;

1480

}

1481

1482

if(quit_now){

1483

goto end;

1484

}

1485

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1486

1212

port = (uint16_t)tmpmax;

1487

1213

*address = '\0';

1488

1214

address = connect_to;

1493

1219

} else {

1494

1220

af = AF_INET;

1495

1221

}

1496

1497

if(quit_now){

1498

goto end;

1499

}

1500

1501

1222

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

1502

1223

if(ret < 0){

1503

switch(errno){

1504

case ENETUNREACH:

1505

case EHOSTDOWN:

1506

case EHOSTUNREACH:

1507

exitcode = EX_NOHOST;

1508

break;

1509

case EINVAL:

1510

exitcode = EX_USAGE;

1511

break;

1512

case EIO:

1513

exitcode = EX_IOERR;

1514

break;

1515

case EPROTO:

1516

exitcode = EX_PROTOCOL;

1517

break;

1518

default:

1519

exitcode = EX_OSERR;

1520

break;

1521

}

1224

exitcode = EXIT_FAILURE;

1522

1225

} else {

1523

1226

exitcode = EXIT_SUCCESS;

1524

1227

}

1525

1228

goto end;

1526

1229

}

1527

1528

if(quit_now){

1529

goto end;

1530

}

1531

1230

1532

1231

{

1533

1232

AvahiServerConfig config;

1534

1233

/* Do not publish any local Zeroconf records */

1551

1250

if(mc.server == NULL){

1552

1251

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

1553

1252

avahi_strerror(error));

1554

exitcode = EX_UNAVAILABLE;

1555

goto end;

1556

}

1557

1558

if(quit_now){

1253

exitcode = EXIT_FAILURE;

1559

1254

goto end;

1560

1255

}

1561

1256

1566

1261

if(sb == NULL){

1567

1262

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

1568

1263

avahi_strerror(avahi_server_errno(mc.server)));

1569

exitcode = EX_UNAVAILABLE;

1570

goto end;

1571

}

1572

1573

if(quit_now){

1264

exitcode = EXIT_FAILURE;

1574

1265

goto end;

1575

1266

}

1576

1267

1608

1299

gpgme_release(mc.ctx);

1609

1300

}

1610

1301

1611

/* Take down the network interface */

1612

if(take_down_interface){

1613

/* Re-raise priviliges */

1614

errno = 0;

1615

ret = seteuid(0);

1616

if(ret == -1){

1617

perror("seteuid");

1618

}

1619

if(geteuid() == 0){

1620

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

1621

if(ret == -1){

1622

perror("ioctl SIOCGIFFLAGS");

1623

} else if(network.ifr_flags & IFF_UP) {

1624

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

1625

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

1626

if(ret == -1){

1627

perror("ioctl SIOCSIFFLAGS");

1628

}

1629

}

1630

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

1631

if(ret == -1){

1632

perror("close");

1633

}

1634

/* Lower privileges permanently */

1635

errno = 0;

1636

ret = setuid(uid);

1637

if(ret == -1){

1638

perror("setuid");

1639

}

1640

}

1641

}

1642

1643

1302

/* Removes the temp directory used by GPGME */

1644

1303

if(tempdir_created){

1645

1304

DIR *d;

1684

1343

}

1685

1344

}

1686

1345

1687

if(quit_now){

1688

sigemptyset(&old_sigterm_action.sa_mask);

1689

old_sigterm_action.sa_handler = SIG_DFL;

1690

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1691

&old_sigterm_action,

1692

NULL));

1693

if(ret == -1){

1694

perror("sigaction");

1695

}

1696

do {

1697

ret = raise(signal_received);

1698

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

1699

if(ret != 0){

1700

perror("raise");

1701

abort();

1702

}

1703

TEMP_FAILURE_RETRY(pause());

1704

}

1705

1706

1346

return exitcode;

1707

1347

}