/mandos/release : revision 237.16.1

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

26

* along with this program. If not, see

27

* <http://www.gnu.org/licenses/>.

28

*

29

* Contact the authors at <mandos@fukt.bsnet.se>.

29

* Contact the authors at <mandos@recompile.se>.

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

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() */

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

#include <sys/stat.h> /* open() */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

59

#include <fcntl.h> /* open() */

62

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

63

strtoimax() */

64

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

65

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

66

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

65

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

66

program_invocation_short_name */

67

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

67

68

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

68

69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

71

72

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

73

*/

73

74

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

74

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

75

setgid() */

76

#include <arpa/inet.h> /* inet_pton(), htons */

75

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

76

setgid(), pause() */

77

#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

77

78

#include <iso646.h> /* not, or, and */

78

79

#include <argp.h> /* struct argp_option, error_t, struct

79

80

argp_state, struct argp,

82

83

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

83

84

sigaction(), SIGTERM, sig_atomic_t,

84

85

raise() */

86

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

85

88

86

89

#ifdef __linux__

87

90

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

120

123

#define PATHDIR "/conf/conf.d/mandos"

121

124

#define SECKEY "seckey.txt"

122

125

#define PUBKEY "pubkey.txt"

126

#define HOOKDIR "/lib/mandos/network-hooks.d"

123

127

124

128

bool debug = false;

125

129

static const char mandos_protocol_version[] = "1";

126

130

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

127

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

131

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

132

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

133

char *connect_to = NULL;

134

135

/* Doubly linked list that need to be circularly linked when used */

136

typedef struct server{

137

const char *ip;

138

uint16_t port;

139

AvahiIfIndex if_index;

140

int af;

141

struct timespec last_seen;

142

struct server *next;

143

struct server *prev;

144

} server;

128

145

129

146

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

130

147

typedef struct {

135

152

gnutls_dh_params_t dh_params;

136

153

const char *priority;

137

154

gpgme_ctx_t ctx;

155

server *current_server;

138

156

} mandos_context;

139

157

140

158

/* global context so signal handler can reach it*/

141

159

mandos_context mc = { .simple_poll = NULL, .server = NULL,

142

160

.dh_bits = 1024, .priority = "SECURE256"

143

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

161

":!CTYPE-X.509:+CTYPE-OPENPGP",

162

.current_server = NULL };

163

164

sig_atomic_t quit_now = 0;

165

int signal_received = 0;

166

167

/* Function to use when printing errors */

168

void perror_plus(const char *print_text){

169

fprintf(stderr, "Mandos plugin %s: ",

170

program_invocation_short_name);

171

perror(print_text);

172

}

144

173

145

174

/*

146

175

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

159

188

return buffer_capacity;

160

189

}

161

190

191

/* Add server to set of servers to retry periodically */

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

195

int ret;

196

server *new_server = malloc(sizeof(server));

197

if(new_server == NULL){

198

perror_plus("malloc");

199

return -1;

200

}

201

*new_server = (server){ .ip = strdup(ip),

202

.port = port,

203

.if_index = if_index,

204

.af = af };

205

if(new_server->ip == NULL){

206

perror_plus("strdup");

207

return -1;

208

}

209

/* Special case of first server */

210

if (mc.current_server == NULL){

211

new_server->next = new_server;

212

new_server->prev = new_server;

213

mc.current_server = new_server;

214

/* Place the new server last in the list */

215

} else {

216

new_server->next = mc.current_server;

217

new_server->prev = mc.current_server->prev;

218

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

227

}

228

162

229

/*

163

230

* Initialize GPGME.

164

231

*/

165

232

static bool init_gpgme(const char *seckey,

166

233

const char *pubkey, const char *tempdir){

167

int ret;

168

234

gpgme_error_t rc;

169

235

gpgme_engine_info_t engine_info;

170

236

173

239

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

174

240

*/

175

241

bool import_key(const char *filename){

242

int ret;

176

243

int fd;

177

244

gpgme_data_t pgp_data;

178

245

179

246

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

180

247

if(fd == -1){

181

perror("open");

248

perror_plus("open");

182

249

return false;

183

250

}

184

251

198

265

199

266

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

200

267

if(ret == -1){

201

perror("close");

268

perror_plus("close");

202

269

}

203

270

gpgme_data_release(pgp_data);

204

271

return true;

217

284

return false;

218

285

}

219

286

220

/* Set GPGME home directory for the OpenPGP engine only */

287

/* Set GPGME home directory for the OpenPGP engine only */

221

288

rc = gpgme_get_engine_info(&engine_info);

222

289

if(rc != GPG_ERR_NO_ERROR){

223

290

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

329

396

330

397

/* Seek back to the beginning of the GPGME plaintext data buffer */

331

398

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

332

perror("gpgme_data_seek");

399

perror_plus("gpgme_data_seek");

333

400

plaintext_length = -1;

334

401

goto decrypt_end;

335

402

}

340

407

(size_t)plaintext_length,

341

408

plaintext_capacity);

342

409

if(plaintext_capacity == 0){

343

perror("incbuffer");

410

perror_plus("incbuffer");

344

411

plaintext_length = -1;

345

412

goto decrypt_end;

346

413

}

353

420

break;

354

421

}

355

422

if(ret < 0){

356

perror("gpgme_data_read");

423

perror_plus("gpgme_data_read");

357

424

plaintext_length = -1;

358

425

goto decrypt_end;

359

426

}

416

483

}

417

484

418

485

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

487

if(ret != GNUTLS_E_SUCCESS){

421

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

422

from

423

-Wunreachable-code

424

*/

488

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

425

489

safer_gnutls_strerror(ret));

426

490

gnutls_global_deinit();

427

491

return -1;

474

538

static int init_gnutls_session(gnutls_session_t *session){

475

539

int ret;

476

540

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

541

do {

542

ret = gnutls_init(session, GNUTLS_SERVER);

543

if(quit_now){

544

return -1;

545

}

546

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

478

547

if(ret != GNUTLS_E_SUCCESS){

479

548

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

480

549

safer_gnutls_strerror(ret));

482

551

483

552

{

484

553

const char *err;

485

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

554

do {

555

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

556

if(quit_now){

557

gnutls_deinit(*session);

558

return -1;

559

}

560

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

486

561

if(ret != GNUTLS_E_SUCCESS){

487

562

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

488

563

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

492

567

}

493

568

}

494

569

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

570

do {

571

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

572

mc.cred);

573

if(quit_now){

574

gnutls_deinit(*session);

575

return -1;

576

}

577

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

497

578

if(ret != GNUTLS_E_SUCCESS){

498

579

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

499

580

safer_gnutls_strerror(ret));

502

583

}

503

584

504

585

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

586

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

587

508

588

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

589

514

594

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

515

595

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

516

596

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

520

597

/* Called when a Mandos server is found */

521

598

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

522

599

AvahiIfIndex if_index,

528

605

struct sockaddr_in6 in6;

529

606

} to;

530

607

char *buffer = NULL;

531

char *decrypted_buffer;

608

char *decrypted_buffer = NULL;

532

609

size_t buffer_length = 0;

533

610

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

535

611

size_t written;

536

int retval = 0;

612

int retval = -1;

537

613

gnutls_session_t session;

538

614

int pf; /* Protocol family */

539

615

616

errno = 0;

617

540

618

if(quit_now){

619

errno = EINTR;

541

620

return -1;

542

621

}

543

622

550

629

break;

551

630

default:

552

631

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

632

errno = EINVAL;

553

633

return -1;

554

634

}

555

635

565

645

566

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

567

647

if(tcp_sd < 0){

568

perror("socket");

569

retval = -1;

648

int e = errno;

649

perror_plus("socket");

650

errno = e;

570

651

goto mandos_end;

571

652

}

572

653

573

654

if(quit_now){

655

errno = EINTR;

574

656

goto mandos_end;

575

657

}

576

658

583

665

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

584

666

}

585

667

if(ret < 0 ){

586

perror("inet_pton");

587

retval = -1;

668

int e = errno;

669

perror_plus("inet_pton");

670

errno = e;

588

671

goto mandos_end;

589

672

}

590

673

if(ret == 0){

674

int e = errno;

591

675

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

592

retval = -1;

676

errno = e;

593

677

goto mandos_end;

594

678

}

595

679

if(af == AF_INET6){

603

687

if(if_index == AVAHI_IF_UNSPEC){

604

688

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

605

689

" without a network interface\n");

606

retval = -1;

690

errno = EINVAL;

607

691

goto mandos_end;

608

692

}

609

693

/* Set the network interface number as scope */

616

700

}

617

701

618

702

if(quit_now){

703

errno = EINTR;

619

704

goto mandos_end;

620

705

}

621

706

623

708

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

624

709

char interface[IF_NAMESIZE];

625

710

if(if_indextoname((unsigned int)if_index, interface) == NULL){

626

perror("if_indextoname");

711

perror_plus("if_indextoname");

627

712

} else {

628

713

fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",

629

714

ip, interface, port);

643

728

sizeof(addrstr));

644

729

}

645

730

if(pcret == NULL){

646

perror("inet_ntop");

731

perror_plus("inet_ntop");

647

732

} else {

648

733

if(strcmp(addrstr, ip) != 0){

649

734

fprintf(stderr, "Canonical address form: %s\n", addrstr);

652

737

}

653

738

654

739

if(quit_now){

740

errno = EINTR;

655

741

goto mandos_end;

656

742

}

657

743

661

747

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

662

748

}

663

749

if(ret < 0){

664

perror("connect");

665

retval = -1;

750

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

751

int e = errno;

752

perror_plus("connect");

753

errno = e;

754

}

666

755

goto mandos_end;

667

756

}

668

757

669

758

if(quit_now){

759

errno = EINTR;

670

760

goto mandos_end;

671

761

}

672

762

677

767

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

678

768

out_size - written));

679

769

if(ret == -1){

680

perror("write");

681

retval = -1;

770

int e = errno;

771

perror_plus("write");

772

errno = e;

682

773

goto mandos_end;

683

774

}

684

775

written += (size_t)ret;

694

785

}

695

786

696

787

if(quit_now){

788

errno = EINTR;

697

789

goto mandos_end;

698

790

}

699

791

}

703

795

}

704

796

705

797

if(quit_now){

798

errno = EINTR;

706

799

goto mandos_end;

707

800

}

708

801

802

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

709

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

710

804

711

805

if(quit_now){

806

errno = EINTR;

712

807

goto mandos_end;

713

808

}

714

809

715

do{

810

do {

716

811

ret = gnutls_handshake(session);

717

812

if(quit_now){

813

errno = EINTR;

718

814

goto mandos_end;

719

815

}

720

816

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

724

820

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

725

821

gnutls_perror(ret);

726

822

}

727

retval = -1;

823

errno = EPROTO;

728

824

goto mandos_end;

729

825

}

730

826

738

834

while(true){

739

835

740

836

if(quit_now){

837

errno = EINTR;

741

838

goto mandos_end;

742

839

}

743

840

744

841

buffer_capacity = incbuffer(&buffer, buffer_length,

745

842

buffer_capacity);

746

843

if(buffer_capacity == 0){

747

perror("incbuffer");

748

retval = -1;

844

int e = errno;

845

perror_plus("incbuffer");

846

errno = e;

749

847

goto mandos_end;

750

848

}

751

849

752

850

if(quit_now){

851

errno = EINTR;

753

852

goto mandos_end;

754

853

}

755

854

764

863

case GNUTLS_E_AGAIN:

765

864

break;

766

865

case GNUTLS_E_REHANDSHAKE:

767

do{

866

do {

768

867

ret = gnutls_handshake(session);

769

868

770

869

if(quit_now){

870

errno = EINTR;

771

871

goto mandos_end;

772

872

}

773

873

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

774

874

if(ret < 0){

775

875

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

776

876

gnutls_perror(ret);

777

retval = -1;

877

errno = EPROTO;

778

878

goto mandos_end;

779

879

}

780

880

break;

781

881

default:

782

882

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

783

883

" encrypted session with Mandos server\n");

784

retval = -1;

785

884

gnutls_bye(session, GNUTLS_SHUT_RDWR);

885

errno = EIO;

786

886

goto mandos_end;

787

887

}

788

888

} else {

795

895

}

796

896

797

897

if(quit_now){

798

goto mandos_end;

799

}

800

801

gnutls_bye(session, GNUTLS_SHUT_RDWR);

802

803

if(quit_now){

804

goto mandos_end;

805

}

898

errno = EINTR;

899

goto mandos_end;

900

}

901

902

do {

903

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

904

if(quit_now){

905

errno = EINTR;

906

goto mandos_end;

907

}

908

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

806

909

807

910

if(buffer_length > 0){

911

ssize_t decrypted_buffer_size;

808

912

decrypted_buffer_size = pgp_packet_decrypt(buffer,

809

913

buffer_length,

810

914

&decrypted_buffer);

811

915

if(decrypted_buffer_size >= 0){

916

812

917

written = 0;

813

918

while(written < (size_t) decrypted_buffer_size){

814

919

if(quit_now){

920

errno = EINTR;

815

921

goto mandos_end;

816

922

}

817

923

819

925

(size_t)decrypted_buffer_size - written,

820

926

stdout);

821

927

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

928

int e = errno;

822

929

if(debug){

823

930

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

824

931

strerror(errno));

825

932

}

826

retval = -1;

827

break;

933

errno = e;

934

goto mandos_end;

828

935

}

829

936

written += (size_t)ret;

830

937

}

831

free(decrypted_buffer);

832

} else {

833

retval = -1;

938

retval = 0;

834

939

}

835

} else {

836

retval = -1;

837

940

}

838

941

839

942

/* Shutdown procedure */

840

943

841

944

mandos_end:

842

free(buffer);

843

if(tcp_sd >= 0){

844

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

845

}

846

if(ret == -1){

847

perror("close");

848

}

849

gnutls_deinit(session);

850

if(quit_now){

851

retval = -1;

945

{

946

int e = errno;

947

free(decrypted_buffer);

948

free(buffer);

949

if(tcp_sd >= 0){

950

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

951

}

952

if(ret == -1){

953

if(e == 0){

954

e = errno;

955

}

956

perror_plus("close");

957

}

958

gnutls_deinit(session);

959

errno = e;

960

if(quit_now){

961

errno = EINTR;

962

retval = -1;

963

}

852

964

}

853

965

return retval;

854

966

}

897

1009

avahi_proto_to_af(proto));

898

1010

if(ret == 0){

899

1011

avahi_simple_poll_quit(mc.simple_poll);

1012

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

900

1015

}

901

1016

}

902

1017

}

956

1071

}

957

1072

}

958

1073

959

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

1074

/* Signal handler that stops main loop after SIGTERM */

960

1075

static void handle_sigterm(int sig){

961

1076

if(quit_now){

962

1077

return;

964

1079

quit_now = 1;

965

1080

signal_received = sig;

966

1081

int old_errno = errno;

1082

/* set main loop to exit */

967

1083

if(mc.simple_poll != NULL){

968

1084

avahi_simple_poll_quit(mc.simple_poll);

969

1085

}

970

1086

errno = old_errno;

971

1087

}

972

1088

1089

bool get_flags(const char *ifname, struct ifreq *ifr){

1090

int ret;

1091

1092

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1093

if(s < 0){

1094

perror_plus("socket");

1095

return false;

1096

}

1097

strcpy(ifr->ifr_name, ifname);

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

if(ret == -1){

1100

if(debug){

1101

perror_plus("ioctl SIOCGIFFLAGS");

1102

}

1103

return false;

1104

}

1105

return true;

1106

}

1107

1108

bool good_flags(const char *ifname, const struct ifreq *ifr){

1109

1110

/* Reject the loopback device */

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1112

if(debug){

1113

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

1114

ifname);

1115

}

1116

return false;

1117

}

1118

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

1119

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1120

if(debug){

1121

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

1122

ifname);

1123

}

1124

return true;

1125

}

1126

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

1127

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1128

if(debug){

1129

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

1130

ifname);

1131

}

1132

return false;

1133

}

1134

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

1135

if(ifr->ifr_flags & IFF_NOARP){

1136

if(debug){

1137

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

1138

}

1139

return false;

1140

}

1141

1142

/* Accept this device */

1143

if(debug){

1144

fprintf(stderr, "Interface \"%s\" is good\n", ifname);

1145

}

1146

return true;

1147

}

1148

1149

/*

1150

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

1151

* corresponds to an acceptable network device.

1152

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

1153

*/

1154

int good_interface(const struct dirent *if_entry){

1155

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

1156

return 0;

1157

}

1158

1159

struct ifreq ifr;

1160

if(not get_flags(if_entry->d_name, &ifr)){

1161

if(debug){

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

if(not good_flags(if_entry->d_name, &ifr)){

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

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

1176

* corresponds to an acceptable network device which is up.

1177

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

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

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

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

if(not get_flags(if_entry->d_name, &ifr)){

1186

if(debug){

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

if(not (ifr.ifr_flags & IFF_UP)){

1195

if(debug){

1196

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

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

if(not (ifr.ifr_flags & IFF_RUNNING)){

1204

if(debug){

1205

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

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

if(not good_flags(if_entry->d_name, &ifr)){

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

1217

int notdotentries(const struct dirent *direntry){

1218

/* Skip "." and ".." */

1219

if(direntry->d_name[0] == '.'

1220

and (direntry->d_name[1] == '\0'

1221

or (direntry->d_name[1] == '.'

1222

and direntry->d_name[2] == '\0'))){

1223

return 0;

1224

}

1225

return 1;

1226

}

1227

1228

/* Is this directory entry a runnable program? */

1229

int runnable_hook(const struct dirent *direntry){

1230

int ret;

1231

struct stat st;

1232

1233

if((direntry->d_name)[0] == '\0'){

1234

/* Empty name? */

1235

return 0;

1236

}

1237

1238

/* Save pointer to last character */

1239

char *end = strchr(direntry->d_name, '\0')-1;

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

if(((direntry->d_name)[0] == '#')

1247

and (*end == '#')){

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

1255

if(ret == -1){

1256

if(debug){

1257

perror_plus("Could not stat plugin");

1258

}

1259

return 0;

1260

}

1261

if(not (S_ISREG(st.st_mode))){

1262

/* Not a regular file */

1263

return 0;

1264

}

1265

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1266

/* Not executable */

1267

return 0;

1268

}

1269

return 1;

1270

}

1271

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1273

int ret;

1274

struct timespec now;

1275

struct timespec waited_time;

1276

intmax_t block_time;

1277

1278

while(true){

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

"Wait until first server is found. No timeout!\n");

1283

}

1284

ret = avahi_simple_poll_iterate(s, -1);

1285

} else {

1286

if (debug){

1287

fprintf(stderr, "Check current_server if we should run it,"

1288

" or wait\n");

1289

}

1290

/* the current time */

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1292

if(ret == -1){

1293

perror_plus("clock_gettime");

1294

return -1;

1295

}

1296

/* Calculating in ms how long time between now and server

1297

who we visted longest time ago. Now - last seen. */

1298

waited_time.tv_sec = (now.tv_sec

1299

- mc.current_server->last_seen.tv_sec);

1300

waited_time.tv_nsec = (now.tv_nsec

1301

- mc.current_server->last_seen.tv_nsec);

1302

/* total time is 10s/10,000ms.

1303

Converting to s from ms by dividing by 1,000,

1304

and ns to ms by dividing by 1,000,000. */

1305

block_time = ((retry_interval

1306

- ((intmax_t)waited_time.tv_sec * 1000))

1307

- ((intmax_t)waited_time.tv_nsec / 1000000));

1308

1309

if (debug){

1310

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1311

}

1312

1313

if(block_time <= 0){

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1318

if(ret == 0){

1319

avahi_simple_poll_quit(mc.simple_poll);

1320

return 0;

1321

}

1322

ret = clock_gettime(CLOCK_MONOTONIC,

1323

&mc.current_server->last_seen);

1324

if(ret == -1){

1325

perror_plus("clock_gettime");

1326

return -1;

1327

}

1328

mc.current_server = mc.current_server->next;

1329

block_time = 0; /* Call avahi to find new Mandos

1330

servers, but don't block */

1331

}

1332

1333

ret = avahi_simple_poll_iterate(s, (int)block_time);

1334

}

1335

if(ret != 0){

1336

if (ret > 0 or errno != EINTR) {

1337

return (ret != 1) ? ret : 0;

1338

}

1339

}

1340

}

1341

}

1342

973

1343

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

974

1344

AvahiSServiceBrowser *sb = NULL;

975

1345

int error;

977

1347

intmax_t tmpmax;

978

1348

char *tmp;

979

1349

int exitcode = EXIT_SUCCESS;

980

const char *interface = "eth0";

1350

const char *interface = "";

981

1351

struct ifreq network;

982

1352

int sd = -1;

983

1353

bool take_down_interface = false;

984

1354

uid_t uid;

985

1355

gid_t gid;

986

char *connect_to = NULL;

987

1356

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

988

1357

bool tempdir_created = false;

989

1358

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

993

1362

bool gnutls_initialized = false;

994

1363

bool gpgme_initialized = false;

995

1364

float delay = 2.5f;

1365

double retry_interval = 10; /* 10s between trying a server and

1366

retrying the same server again */

996

1367

997

struct sigaction old_sigterm_action;

1368

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

998

1369

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

999

1370

1371

uid = getuid();

1372

gid = getgid();

1373

1374

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

1375

errno = 0;

1376

ret = setgid(gid);

1377

if(ret == -1){

1378

perror_plus("setgid");

1379

}

1380

1381

/* Lower user privileges (temporarily) */

1382

errno = 0;

1383

ret = seteuid(uid);

1384

if(ret == -1){

1385

perror_plus("seteuid");

1386

}

1387

1388

if(quit_now){

1389

goto end;

1390

}

1391

1000

1392

{

1001

1393

struct argp_option options[] = {

1002

1394

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

1031

1423

.arg = "SECONDS",

1032

1424

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

1033

1425

.group = 2 },

1426

{ .name = "retry", .key = 132,

1427

.arg = "SECONDS",

1428

.doc = "Retry interval used when denied by the mandos server",

1429

.group = 2 },

1430

/*

1431

* These reproduce what we would get without ARGP_NO_HELP

1432

*/

1433

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

1434

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

1435

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

1436

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

1437

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

1438

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

1034

1439

{ .name = NULL }

1035

1440

};

1036

1441

1037

1442

error_t parse_opt(int key, char *arg,

1038

1443

struct argp_state *state){

1444

errno = 0;

1039

1445

switch(key){

1040

1446

case 128: /* --debug */

1041

1447

debug = true;

1057

1463

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

1058

1464

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

1059

1465

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

1060

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

1061

exit(EXIT_FAILURE);

1466

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

1062

1467

}

1063

1468

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

1064

1469

break;

1069

1474

errno = 0;

1070

1475

delay = strtof(arg, &tmp);

1071

1476

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

1072

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

1073

exit(EXIT_FAILURE);

1477

argp_error(state, "Bad delay");

1478

}

1479

case 132: /* --retry */

1480

errno = 0;

1481

retry_interval = strtod(arg, &tmp);

1482

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

1483

or (retry_interval * 1000) > INT_MAX

1484

or retry_interval < 0){

1485

argp_error(state, "Bad retry interval");

1074

1486

}

1075

1487

break;

1076

case ARGP_KEY_ARG:

1077

argp_usage(state);

1078

case ARGP_KEY_END:

1488

/*

1489

* These reproduce what we would get without ARGP_NO_HELP

1490

*/

1491

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

1492

argp_state_help(state, state->out_stream,

1493

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1494

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1495

case -3: /* --usage */

1496

argp_state_help(state, state->out_stream,

1497

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1498

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

1499

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

1500

exit(argp_err_exit_status);

1079

1501

break;

1080

1502

default:

1081

1503

return ARGP_ERR_UNKNOWN;

1082

1504

}

1083

return 0;

1505

return errno;

1084

1506

}

1085

1507

1086

1508

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

1087

1509

.args_doc = "",

1088

1510

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

1089

1511

" passwords from a Mandos server" };

1090

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

1091

if(ret == ARGP_ERR_UNKNOWN){

1092

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

1093

exitcode = EXIT_FAILURE;

1094

goto end;

1095

}

1512

ret = argp_parse(&argp, argc, argv,

1513

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1514

switch(ret){

1515

case 0:

1516

break;

1517

case ENOMEM:

1518

default:

1519

errno = ret;

1520

perror_plus("argp_parse");

1521

exitcode = EX_OSERR;

1522

goto end;

1523

case EINVAL:

1524

exitcode = EX_USAGE;

1525

goto end;

1526

}

1527

}

1528

1529

{

1530

/* Work around Debian bug #633582:

1531

<http://bugs.debian.org/633582> */

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,

1594

alphasort);

1595

int devnull = open("/dev/null", O_RDONLY);

1596

for(int i = 0; i < numhooks; i++){

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

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

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

setenv("DEVICE", interface, 1);

1612

setenv("VERBOSE", debug ? "1" : "0", 1);

1613

setenv("MODE", "start", 1);

1614

/* setenv( XXX more here */

1615

ret = execl(fullname, direntry->d_name, "start", NULL);

1616

perror_plus("execl");

1617

}

1618

free(fullname);

1619

if(quit_now){

1620

goto end;

1621

}

1622

}

1623

close(devnull);

1096

1624

}

1097

1625

1098

1626

if(not debug){

1099

1627

avahi_set_log_function(empty_log);

1100

1628

}

1101

1629

1630

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

1631

struct dirent **direntries;

1632

/* First look for interfaces that are up */

1633

ret = scandir(sys_class_net, &direntries, up_interface,

1634

alphasort);

1635

if(ret == 0){

1636

/* No up interfaces, look for any good interfaces */

1637

free(direntries);

1638

ret = scandir(sys_class_net, &direntries, good_interface,

1639

alphasort);

1640

}

1641

if(ret >= 1){

1642

/* Pick the first interface returned */

1643

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

1644

if(debug){

1645

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

1646

}

1647

if(interface == NULL){

1648

perror_plus("malloc");

1649

free(direntries);

1650

exitcode = EXIT_FAILURE;

1651

goto end;

1652

}

1653

free(direntries);

1654

} else {

1655

free(direntries);

1656

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

1657

exitcode = EXIT_FAILURE;

1658

goto end;

1659

}

1660

}

1661

1102

1662

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

1103

1663

from the signal handler */

1104

1664

/* Initialize the pseudo-RNG for Avahi */

1106

1666

mc.simple_poll = avahi_simple_poll_new();

1107

1667

if(mc.simple_poll == NULL){

1108

1668

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

1109

exitcode = EXIT_FAILURE;

1669

exitcode = EX_UNAVAILABLE;

1110

1670

goto end;

1111

1671

}

1112

1672

1113

1673

sigemptyset(&sigterm_action.sa_mask);

1114

1674

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

1115

1675

if(ret == -1){

1116

perror("sigaddset");

1117

exitcode = EXIT_FAILURE;

1676

perror_plus("sigaddset");

1677

exitcode = EX_OSERR;

1118

1678

goto end;

1119

1679

}

1120

1680

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

1121

1681

if(ret == -1){

1122

perror("sigaddset");

1123

exitcode = EXIT_FAILURE;

1682

perror_plus("sigaddset");

1683

exitcode = EX_OSERR;

1124

1684

goto end;

1125

1685

}

1126

1686

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

1127

1687

if(ret == -1){

1128

perror("sigaddset");

1129

exitcode = EXIT_FAILURE;

1688

perror_plus("sigaddset");

1689

exitcode = EX_OSERR;

1130

1690

goto end;

1131

1691

}

1132

1692

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

1135

1695

*/

1136

1696

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

1137

1697

if(ret == -1){

1138

perror("sigaction");

1139

return EXIT_FAILURE;

1698

perror_plus("sigaction");

1699

return EX_OSERR;

1140

1700

}

1141

1701

if(old_sigterm_action.sa_handler != SIG_IGN){

1142

1702

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

1143

1703

if(ret == -1){

1144

perror("sigaction");

1145

exitcode = EXIT_FAILURE;

1704

perror_plus("sigaction");

1705

exitcode = EX_OSERR;

1146

1706

goto end;

1147

1707

}

1148

1708

}

1149

1709

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

1150

1710

if(ret == -1){

1151

perror("sigaction");

1152

return EXIT_FAILURE;

1711

perror_plus("sigaction");

1712

return EX_OSERR;

1153

1713

}

1154

1714

if(old_sigterm_action.sa_handler != SIG_IGN){

1155

1715

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

1156

1716

if(ret == -1){

1157

perror("sigaction");

1158

exitcode = EXIT_FAILURE;

1717

perror_plus("sigaction");

1718

exitcode = EX_OSERR;

1159

1719

goto end;

1160

1720

}

1161

1721

}

1162

1722

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

1163

1723

if(ret == -1){

1164

perror("sigaction");

1165

return EXIT_FAILURE;

1724

perror_plus("sigaction");

1725

return EX_OSERR;

1166

1726

}

1167

1727

if(old_sigterm_action.sa_handler != SIG_IGN){

1168

1728

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

1169

1729

if(ret == -1){

1170

perror("sigaction");

1171

exitcode = EXIT_FAILURE;

1730

perror_plus("sigaction");

1731

exitcode = EX_OSERR;

1172

1732

goto end;

1173

1733

}

1174

1734

}

1175

1735

1176

1736

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

1177

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

1737

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

1178

1738

if_index = (AvahiIfIndex) if_nametoindex(interface);

1179

1739

if(if_index == 0){

1180

1740

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

1181

exitcode = EXIT_FAILURE;

1741

exitcode = EX_UNAVAILABLE;

1182

1742

goto end;

1183

1743

}

1184

1744

1186

1746

goto end;

1187

1747

}

1188

1748

1749

/* Re-raise priviliges */

1750

errno = 0;

1751

ret = seteuid(0);

1752

if(ret == -1){

1753

perror_plus("seteuid");

1754

}

1755

1189

1756

#ifdef __linux__

1190

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1191

messages to mess up the prompt */

1758

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

1192

1759

ret = klogctl(8, NULL, 5);

1193

1760

bool restore_loglevel = true;

1194

1761

if(ret == -1){

1195

1762

restore_loglevel = false;

1196

perror("klogctl");

1763

perror_plus("klogctl");

1197

1764

}

1198

1765

#endif /* __linux__ */

1199

1766

1200

1767

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1201

1768

if(sd < 0){

1202

perror("socket");

1203

exitcode = EXIT_FAILURE;

1769

perror_plus("socket");

1770

exitcode = EX_OSERR;

1204

1771

#ifdef __linux__

1205

1772

if(restore_loglevel){

1206

1773

ret = klogctl(7, NULL, 0);

1207

1774

if(ret == -1){

1208

perror("klogctl");

1775

perror_plus("klogctl");

1209

1776

}

1210

1777

}

1211

1778

#endif /* __linux__ */

1779

/* Lower privileges */

1780

errno = 0;

1781

ret = seteuid(uid);

1782

if(ret == -1){

1783

perror_plus("seteuid");

1784

}

1212

1785

goto end;

1213

1786

}

1214

1787

strcpy(network.ifr_name, interface);

1215

1788

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

1216

1789

if(ret == -1){

1217

perror("ioctl SIOCGIFFLAGS");

1790

perror_plus("ioctl SIOCGIFFLAGS");

1218

1791

#ifdef __linux__

1219

1792

if(restore_loglevel){

1220

1793

ret = klogctl(7, NULL, 0);

1221

1794

if(ret == -1){

1222

perror("klogctl");

1795

perror_plus("klogctl");

1223

1796

}

1224

1797

}

1225

1798

#endif /* __linux__ */

1226

exitcode = EXIT_FAILURE;

1799

exitcode = EX_OSERR;

1800

/* Lower privileges */

1801

errno = 0;

1802

ret = seteuid(uid);

1803

if(ret == -1){

1804

perror_plus("seteuid");

1805

}

1227

1806

goto end;

1228

1807

}

1229

1808

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

1232

1811

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

1233

1812

if(ret == -1){

1234

1813

take_down_interface = false;

1235

perror("ioctl SIOCSIFFLAGS");

1236

exitcode = EXIT_FAILURE;

1814

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1815

exitcode = EX_OSERR;

1237

1816

#ifdef __linux__

1238

1817

if(restore_loglevel){

1239

1818

ret = klogctl(7, NULL, 0);

1240

1819

if(ret == -1){

1241

perror("klogctl");

1820

perror_plus("klogctl");

1242

1821

}

1243

1822

}

1244

1823

#endif /* __linux__ */

1824

/* Lower privileges */

1825

errno = 0;

1826

ret = seteuid(uid);

1827

if(ret == -1){

1828

perror_plus("seteuid");

1829

}

1245

1830

goto end;

1246

1831

}

1247

1832

}

1248

/* sleep checking until interface is running */

1833

/* Sleep checking until interface is running.

1834

Check every 0.25s, up to total time of delay */

1249

1835

for(int i=0; i < delay * 4; i++){

1250

1836

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

1251

1837

if(ret == -1){

1252

perror("ioctl SIOCGIFFLAGS");

1838

perror_plus("ioctl SIOCGIFFLAGS");

1253

1839

} else if(network.ifr_flags & IFF_RUNNING){

1254

1840

break;

1255

1841

}

1256

1842

struct timespec sleeptime = { .tv_nsec = 250000000 };

1257

1843

ret = nanosleep(&sleeptime, NULL);

1258

1844

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

1259

perror("nanosleep");

1845

perror_plus("nanosleep");

1260

1846

}

1261

1847

}

1262

1848

if(not take_down_interface){

1263

1849

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

1264

1850

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

1265

1851

if(ret == -1){

1266

perror("close");

1852

perror_plus("close");

1267

1853

}

1268

1854

}

1269

1855

#ifdef __linux__

1271

1857

/* Restores kernel loglevel to default */

1272

1858

ret = klogctl(7, NULL, 0);

1273

1859

if(ret == -1){

1274

perror("klogctl");

1860

perror_plus("klogctl");

1275

1861

}

1276

1862

}

1277

1863

#endif /* __linux__ */

1278

}

1279

1280

if(quit_now){

1281

goto end;

1282

}

1283

1284

uid = getuid();

1285

gid = getgid();

1286

1287

errno = 0;

1288

setgid(gid);

1289

if(ret == -1){

1290

perror("setgid");

1291

}

1292

1293

ret = setuid(uid);

1294

if(ret == -1){

1295

perror("setuid");

1864

/* Lower privileges */

1865

errno = 0;

1866

if(take_down_interface){

1867

/* Lower privileges */

1868

ret = seteuid(uid);

1869

if(ret == -1){

1870

perror_plus("seteuid");

1871

}

1872

} else {

1873

/* Lower privileges permanently */

1874

ret = setuid(uid);

1875

if(ret == -1){

1876

perror_plus("setuid");

1877

}

1878

}

1296

1879

}

1297

1880

1298

1881

if(quit_now){

1302

1885

ret = init_gnutls_global(pubkey, seckey);

1303

1886

if(ret == -1){

1304

1887

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

1305

exitcode = EXIT_FAILURE;

1888

exitcode = EX_UNAVAILABLE;

1306

1889

goto end;

1307

1890

} else {

1308

1891

gnutls_initialized = true;

1312

1895

goto end;

1313

1896

}

1314

1897

1898

if(mkdtemp(tempdir) == NULL){

1899

perror_plus("mkdtemp");

1900

goto end;

1901

}

1315

1902

tempdir_created = true;

1316

if(mkdtemp(tempdir) == NULL){

1317

tempdir_created = false;

1318

perror("mkdtemp");

1319

goto end;

1320

}

1321

1903

1322

1904

if(quit_now){

1323

1905

goto end;

1325

1907

1326

1908

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

1327

1909

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

1328

exitcode = EXIT_FAILURE;

1910

exitcode = EX_UNAVAILABLE;

1329

1911

goto end;

1330

1912

} else {

1331

1913

gpgme_initialized = true;

1341

1923

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

1342

1924

if(address == NULL){

1343

1925

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

1344

exitcode = EXIT_FAILURE;

1926

exitcode = EX_USAGE;

1345

1927

goto end;

1346

1928

}

1347

1929

1355

1937

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

1356

1938

or tmpmax != (uint16_t)tmpmax){

1357

1939

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

1358

exitcode = EXIT_FAILURE;

1940

exitcode = EX_USAGE;

1359

1941

goto end;

1360

1942

}

1361

1943

1365

1947

1366

1948

port = (uint16_t)tmpmax;

1367

1949

*address = '\0';

1368

address = connect_to;

1369

1950

/* Colon in address indicates IPv6 */

1370

1951

int af;

1371

if(strchr(address, ':') != NULL){

1952

if(strchr(connect_to, ':') != NULL){

1372

1953

af = AF_INET6;

1954

/* Accept [] around IPv6 address - see RFC 5952 */

1955

if(connect_to[0] == '[' and address[-1] == ']')

1956

{

1957

connect_to++;

1958

address[-1] = '\0';

1959

}

1373

1960

} else {

1374

1961

af = AF_INET;

1375

1962

}

1963

address = connect_to;

1376

1964

1377

1965

if(quit_now){

1378

1966

goto end;

1379

1967

}

1380

1968

1381

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

1382

if(ret < 0){

1383

exitcode = EXIT_FAILURE;

1384

} else {

1969

while(not quit_now){

1970

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

1971

if(quit_now or ret == 0){

1972

break;

1973

}

1974

if(debug){

1975

fprintf(stderr, "Retrying in %d seconds\n",

1976

(int)retry_interval);

1977

}

1978

sleep((int)retry_interval);

1979

}

1980

1981

if (not quit_now){

1385

1982

exitcode = EXIT_SUCCESS;

1386

1983

}

1984

1387

1985

goto end;

1388

1986

}

1389

1987

1413

2011

if(mc.server == NULL){

1414

2012

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

1415

2013

avahi_strerror(error));

1416

exitcode = EXIT_FAILURE;

2014

exitcode = EX_UNAVAILABLE;

1417

2015

goto end;

1418

2016

}

1419

2017

1428

2026

if(sb == NULL){

1429

2027

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

1430

2028

avahi_strerror(avahi_server_errno(mc.server)));

1431

exitcode = EXIT_FAILURE;

2029

exitcode = EX_UNAVAILABLE;

1432

2030

goto end;

1433

2031

}

1434

2032

1441

2039

if(debug){

1442

2040

fprintf(stderr, "Starting Avahi loop search\n");

1443

2041

}

1444

1445

avahi_simple_poll_loop(mc.simple_poll);

2042

2043

ret = avahi_loop_with_timeout(mc.simple_poll,

2044

(int)(retry_interval * 1000));

2045

if(debug){

2046

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

2047

(ret == 0) ? "successfully" : "with error");

2048

}

1446

2049

1447

2050

end:

1448

2051

1469

2072

if(gpgme_initialized){

1470

2073

gpgme_release(mc.ctx);

1471

2074

}

2075

2076

/* Cleans up the circular linked list of Mandos servers the client

2077

has seen */

2078

if(mc.current_server != NULL){

2079

mc.current_server->prev->next = NULL;

2080

while(mc.current_server != NULL){

2081

server *next = mc.current_server->next;

2082

free(mc.current_server);

2083

mc.current_server = next;

2084

}

2085

}

2086

2087

/* XXX run network hooks "stop" here */

1472

2088

1473

2089

/* Take down the network interface */

1474

2090

if(take_down_interface){

1475

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

2091

/* Re-raise priviliges */

2092

errno = 0;

2093

ret = seteuid(0);

1476

2094

if(ret == -1){

1477

perror("ioctl SIOCGIFFLAGS");

1478

} else if(network.ifr_flags & IFF_UP) {

1479

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

1480

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

1481

if(ret == -1){

1482

perror("ioctl SIOCSIFFLAGS");

1483

}

2095

perror_plus("seteuid");

1484

2096

}

1485

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

1486

if(ret == -1){

1487

perror("close");

2097

if(geteuid() == 0){

2098

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

2099

if(ret == -1){

2100

perror_plus("ioctl SIOCGIFFLAGS");

2101

} else if(network.ifr_flags & IFF_UP) {

2102

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

2103

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

2104

if(ret == -1){

2105

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2106

}

2107

}

2108

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

2109

if(ret == -1){

2110

perror_plus("close");

2111

}

2112

/* Lower privileges permanently */

2113

errno = 0;

2114

ret = setuid(uid);

2115

if(ret == -1){

2116

perror_plus("setuid");

2117

}

1488

2118

}

1489

2119

}

1490

2120

1491

/* Removes the temp directory used by GPGME */

2121

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

1492

2122

if(tempdir_created){

1493

DIR *d;

1494

struct dirent *direntry;

1495

d = opendir(tempdir);

1496

if(d == NULL){

1497

if(errno != ENOENT){

1498

perror("opendir");

1499

}

1500

} else {

1501

while(true){

1502

direntry = readdir(d);

1503

if(direntry == NULL){

1504

break;

1505

}

1506

/* Skip "." and ".." */

1507

if(direntry->d_name[0] == '.'

1508

and (direntry->d_name[1] == '\0'

1509

or (direntry->d_name[1] == '.'

1510

and direntry->d_name[2] == '\0'))){

1511

continue;

1512

}

2123

struct dirent **direntries = NULL;

2124

struct dirent *direntry = NULL;

2125

int numentries = scandir(tempdir, &direntries, notdotentries,

2126

alphasort);

2127

if (numentries > 0){

2128

for(int i = 0; i < numentries; i++){

2129

direntry = direntries[i];

1513

2130

char *fullname = NULL;

1514

2131

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

1515

2132

direntry->d_name);

1516

2133

if(ret < 0){

1517

perror("asprintf");

2134

perror_plus("asprintf");

1518

2135

continue;

1519

2136

}

1520

2137

ret = remove(fullname);

1524

2141

}

1525

2142

free(fullname);

1526

2143

}

1527

closedir(d);

2144

}

2145

2146

/* need to clean even if 0 because man page doesn't specify */

2147

free(direntries);

2148

if (numentries == -1){

2149

perror_plus("scandir");

1528

2150

}

1529

2151

ret = rmdir(tempdir);

1530

2152

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

1531

perror("rmdir");

2153

perror_plus("rmdir");

1532

2154

}

1533

2155

}

1534

2156

1535

2157

if(quit_now){

1536

2158

sigemptyset(&old_sigterm_action.sa_mask);

1537

2159

old_sigterm_action.sa_handler = SIG_DFL;

1538

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

2160

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2161

&old_sigterm_action,

2162

NULL));

1539

2163

if(ret == -1){

1540

perror("sigaction");

1541

}

1542

raise(signal_received);

2164

perror_plus("sigaction");

2165

}

2166

do {

2167

ret = raise(signal_received);

2168

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

2169

if(ret != 0){

2170

perror_plus("raise");

2171

abort();

2172

}

2173

TEMP_FAILURE_RETRY(pause());

1543

2174

}

1544

2175

1545

2176

return exitcode;