/mandos/trunk : revision 354

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

47

strtof(), abort() */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,

47

srand(), strtof() */

48

#include <stdbool.h> /* bool, false, true */

49

#include <string.h> /* memset(), strcmp(), strlen(),

50

strerror(), asprintf(), strcpy() */

62

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

63

strtoimax() */

64

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

65

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

66

program_invocation_short_name */

67

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

65

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

66

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

68

67

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

69

68

SIOCSIFFLAGS, if_indextoname(),

70

69

if_nametoindex(), IF_NAMESIZE */

72

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

73

72

*/

74

73

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

75

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

76

setgid(), pause() */

77

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

74

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

75

setgid() */

76

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

78

77

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

79

78

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

80

79

argp_state, struct argp,

83

82

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

84

83

sigaction(), SIGTERM, sig_atomic_t,

85

84

raise() */

86

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

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

85

89

86

#ifdef __linux__

90

87

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

128

125

static const char mandos_protocol_version[] = "1";

129

126

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

130

127

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

131

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

132

char *connect_to = NULL;

133

134

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

135

typedef struct server{

136

const char *ip;

137

uint16_t port;

138

AvahiIfIndex if_index;

139

int af;

140

struct timespec last_seen;

141

struct server *next;

142

struct server *prev;

143

} server;

144

128

145

129

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

146

130

typedef struct {

151

135

gnutls_dh_params_t dh_params;

152

136

const char *priority;

153

137

gpgme_ctx_t ctx;

154

server *current_server;

155

138

} mandos_context;

156

139

157

140

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

158

141

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

159

142

.dh_bits = 1024, .priority = "SECURE256"

160

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

161

.current_server = NULL };

162

163

sig_atomic_t quit_now = 0;

164

int signal_received = 0;

165

166

/* Function to use when printing errors */

167

void perror_plus(const char *print_text){

168

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

169

program_invocation_short_name);

170

perror(print_text);

171

}

143

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

172

144

173

145

/*

174

146

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

187

159

return buffer_capacity;

188

160

}

189

161

190

int add_server(const char *ip, uint16_t port,

191

AvahiIfIndex if_index,

192

int af){

193

int ret;

194

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

195

if(new_server == NULL){

196

perror_plus("malloc");

197

return -1;

198

}

199

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

200

.port = port,

201

.if_index = if_index,

202

.af = af };

203

if(new_server->ip == NULL){

204

perror_plus("strdup");

205

return -1;

206

}

207

/* unique case of first server */

208

if (mc.current_server == NULL){

209

new_server->next = new_server;

210

new_server->prev = new_server;

211

mc.current_server = new_server;

212

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

213

} else {

214

new_server->next = mc.current_server;

215

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

216

new_server->prev->next = new_server;

217

mc.current_server->prev = new_server;

218

}

219

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

220

if(ret == -1){

221

perror_plus("clock_gettime");

222

return -1;

223

}

224

return 0;

225

}

226

227

162

/*

228

163

* Initialize GPGME.

229

164

*/

230

165

static bool init_gpgme(const char *seckey,

231

166

const char *pubkey, const char *tempdir){

167

int ret;

232

168

gpgme_error_t rc;

233

169

gpgme_engine_info_t engine_info;

234

170

237

173

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

238

174

*/

239

175

bool import_key(const char *filename){

240

int ret;

241

176

int fd;

242

177

gpgme_data_t pgp_data;

243

178

244

179

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

245

180

if(fd == -1){

246

perror_plus("open");

181

perror("open");

247

182

return false;

248

183

}

249

184

263

198

264

199

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

265

200

if(ret == -1){

266

perror_plus("close");

201

perror("close");

267

202

}

268

203

gpgme_data_release(pgp_data);

269

204

return true;

314

249

return false;

315

250

}

316

251

317

return true;

252

return true;

318

253

}

319

254

320

255

/*

394

329

395

330

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

396

331

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

397

perror_plus("gpgme_data_seek");

332

perror("gpgme_data_seek");

398

333

plaintext_length = -1;

399

334

goto decrypt_end;

400

335

}

405

340

(size_t)plaintext_length,

406

341

plaintext_capacity);

407

342

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

343

perror("incbuffer");

409

344

plaintext_length = -1;

410

345

goto decrypt_end;

411

346

}

418

353

break;

419

354

}

420

355

if(ret < 0){

421

perror_plus("gpgme_data_read");

356

perror("gpgme_data_read");

422

357

plaintext_length = -1;

423

358

goto decrypt_end;

424

359

}

481

416

}

482

417

483

418

/* OpenPGP credentials */

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

485

420

if(ret != GNUTLS_E_SUCCESS){

486

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

421

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

422

from

423

-Wunreachable-code

424

*/

487

425

safer_gnutls_strerror(ret));

488

426

gnutls_global_deinit();

489

427

return -1;

536

474

static int init_gnutls_session(gnutls_session_t *session){

537

475

int ret;

538

476

/* GnuTLS session creation */

539

do {

540

ret = gnutls_init(session, GNUTLS_SERVER);

541

if(quit_now){

542

return -1;

543

}

544

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

477

ret = gnutls_init(session, GNUTLS_SERVER);

545

478

if(ret != GNUTLS_E_SUCCESS){

546

479

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

547

480

safer_gnutls_strerror(ret));

549

482

550

483

{

551

484

const char *err;

552

do {

553

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

554

if(quit_now){

555

gnutls_deinit(*session);

556

return -1;

557

}

558

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

485

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

559

486

if(ret != GNUTLS_E_SUCCESS){

560

487

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

561

488

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

565

492

}

566

493

}

567

494

568

do {

569

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

570

mc.cred);

571

if(quit_now){

572

gnutls_deinit(*session);

573

return -1;

574

}

575

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

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

576

497

if(ret != GNUTLS_E_SUCCESS){

577

498

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

578

499

safer_gnutls_strerror(ret));

581

502

}

582

503

583

504

/* ignore client certificate if any. */

584

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

585

507

586

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

587

509

592

514

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

593

515

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

594

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

595

520

/* Called when a Mandos server is found */

596

521

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

597

522

AvahiIfIndex if_index,

598

523

int af){

599

int ret, tcp_sd = -1;

524

int ret, tcp_sd;

600

525

ssize_t sret;

601

526

union {

602

527

struct sockaddr_in in;

603

528

struct sockaddr_in6 in6;

604

529

} to;

605

530

char *buffer = NULL;

606

char *decrypted_buffer = NULL;

531

char *decrypted_buffer;

607

532

size_t buffer_length = 0;

608

533

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

609

535

size_t written;

610

int retval = -1;

536

int retval = 0;

611

537

gnutls_session_t session;

612

538

int pf; /* Protocol family */

613

539

614

errno = 0;

615

616

if(quit_now){

617

errno = EINTR;

618

return -1;

619

}

620

621

540

switch(af){

622

541

case AF_INET6:

623

542

pf = PF_INET6;

627

546

break;

628

547

default:

629

548

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

630

errno = EINVAL;

631

549

return -1;

632

550

}

633

551

643

561

644

562

tcp_sd = socket(pf, SOCK_STREAM, 0);

645

563

if(tcp_sd < 0){

646

int e = errno;

647

perror_plus("socket");

648

errno = e;

649

goto mandos_end;

650

}

651

652

if(quit_now){

653

errno = EINTR;

654

goto mandos_end;

564

perror("socket");

565

return -1;

655

566

}

656

567

657

568

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

663

574

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

664

575

}

665

576

if(ret < 0 ){

666

int e = errno;

667

perror_plus("inet_pton");

668

errno = e;

669

goto mandos_end;

577

perror("inet_pton");

578

return -1;

670

579

}

671

580

if(ret == 0){

672

int e = errno;

673

581

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

674

errno = e;

675

goto mandos_end;

582

return -1;

676

583

}

677

584

if(af == AF_INET6){

678

585

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

685

592

if(if_index == AVAHI_IF_UNSPEC){

686

593

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

687

594

" without a network interface\n");

688

errno = EINVAL;

689

goto mandos_end;

595

return -1;

690

596

}

691

597

/* Set the network interface number as scope */

692

598

to.in6.sin6_scope_id = (uint32_t)if_index;

697

603

-Wunreachable-code */

698

604

}

699

605

700

if(quit_now){

701

errno = EINTR;

702

goto mandos_end;

703

}

704

705

606

if(debug){

706

607

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

707

608

char interface[IF_NAMESIZE];

708

609

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

709

perror_plus("if_indextoname");

610

perror("if_indextoname");

710

611

} else {

711

612

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

712

613

ip, interface, port);

726

627

sizeof(addrstr));

727

628

}

728

629

if(pcret == NULL){

729

perror_plus("inet_ntop");

630

perror("inet_ntop");

730

631

} else {

731

632

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

732

633

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

734

635

}

735

636

}

736

637

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

742

638

if(af == AF_INET6){

743

639

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

744

640

} else {

745

641

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

746

642

}

747

643

if(ret < 0){

748

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

749

int e = errno;

750

perror_plus("connect");

751

errno = e;

752

}

753

goto mandos_end;

754

}

755

756

if(quit_now){

757

errno = EINTR;

758

goto mandos_end;

644

perror("connect");

645

return -1;

759

646

}

760

647

761

648

const char *out = mandos_protocol_version;

765

652

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

766

653

out_size - written));

767

654

if(ret == -1){

768

int e = errno;

769

perror_plus("write");

770

errno = e;

655

perror("write");

656

retval = -1;

771

657

goto mandos_end;

772

658

}

773

659

written += (size_t)ret;

781

667

break;

782

668

}

783

669

}

784

785

if(quit_now){

786

errno = EINTR;

787

goto mandos_end;

788

}

789

670

}

790

671

791

672

if(debug){

792

673

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

793

674

}

794

675

795

if(quit_now){

796

errno = EINTR;

797

goto mandos_end;

798

}

799

800

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

801

676

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

677

803

if(quit_now){

804

errno = EINTR;

805

goto mandos_end;

806

}

807

808

do {

678

do{

809

679

ret = gnutls_handshake(session);

810

if(quit_now){

811

errno = EINTR;

812

goto mandos_end;

813

}

814

680

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

815

681

816

682

if(ret != GNUTLS_E_SUCCESS){

818

684

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

819

685

gnutls_perror(ret);

820

686

}

821

errno = EPROTO;

687

retval = -1;

822

688

goto mandos_end;

823

689

}

824

690

830

696

}

831

697

832

698

while(true){

833

834

if(quit_now){

835

errno = EINTR;

836

goto mandos_end;

837

}

838

839

699

buffer_capacity = incbuffer(&buffer, buffer_length,

840

700

buffer_capacity);

841

701

if(buffer_capacity == 0){

842

int e = errno;

843

perror_plus("incbuffer");

844

errno = e;

845

goto mandos_end;

846

}

847

848

if(quit_now){

849

errno = EINTR;

702

perror("incbuffer");

703

retval = -1;

850

704

goto mandos_end;

851

705

}

852

706

861

715

case GNUTLS_E_AGAIN:

862

716

break;

863

717

case GNUTLS_E_REHANDSHAKE:

864

do {

718

do{

865

719

ret = gnutls_handshake(session);

866

867

if(quit_now){

868

errno = EINTR;

869

goto mandos_end;

870

}

871

720

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

872

721

if(ret < 0){

873

722

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

874

723

gnutls_perror(ret);

875

errno = EPROTO;

724

retval = -1;

876

725

goto mandos_end;

877

726

}

878

727

break;

879

728

default:

880

729

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

881

730

" encrypted session with Mandos server\n");

731

retval = -1;

882

732

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

errno = EIO;

884

733

goto mandos_end;

885

734

}

886

735

} else {

892

741

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

893

742

}

894

743

895

if(quit_now){

896

errno = EINTR;

897

goto mandos_end;

898

}

899

900

do {

901

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

902

if(quit_now){

903

errno = EINTR;

904

goto mandos_end;

905

}

906

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

744

gnutls_bye(session, GNUTLS_SHUT_RDWR);

907

745

908

746

if(buffer_length > 0){

909

ssize_t decrypted_buffer_size;

910

747

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

748

buffer_length,

912

749

&decrypted_buffer);

913

750

if(decrypted_buffer_size >= 0){

914

915

751

written = 0;

916

752

while(written < (size_t) decrypted_buffer_size){

917

if(quit_now){

918

errno = EINTR;

919

goto mandos_end;

920

}

921

922

753

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

923

754

(size_t)decrypted_buffer_size - written,

924

755

stdout);

925

756

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

926

int e = errno;

927

757

if(debug){

928

758

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

929

759

strerror(errno));

930

760

}

931

errno = e;

932

goto mandos_end;

761

retval = -1;

762

break;

933

763

}

934

764

written += (size_t)ret;

935

765

}

936

retval = 0;

766

free(decrypted_buffer);

767

} else {

768

retval = -1;

937

769

}

770

} else {

771

retval = -1;

938

772

}

939

773

940

774

/* Shutdown procedure */

941

775

942

776

mandos_end:

943

{

944

int e = errno;

945

free(decrypted_buffer);

946

free(buffer);

947

if(tcp_sd >= 0){

948

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

949

}

950

if(ret == -1){

951

if(e == 0){

952

e = errno;

953

}

954

perror_plus("close");

955

}

956

gnutls_deinit(session);

957

errno = e;

958

if(quit_now){

959

errno = EINTR;

960

retval = -1;

961

}

777

free(buffer);

778

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

779

if(ret == -1){

780

perror("close");

962

781

}

782

gnutls_deinit(session);

963

783

return retval;

964

784

}

965

785

1007

827

avahi_proto_to_af(proto));

1008

828

if(ret == 0){

1009

829

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1013

830

}

1014

831

}

1015

832

}

1031

848

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

1032

849

is removed from the LAN */

1033

850

1034

if(quit_now){

1035

return;

1036

}

1037

1038

851

switch(event){

1039

852

default:

1040

853

case AVAHI_BROWSER_FAILURE:

1069

882

}

1070

883

}

1071

884

1072

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

885

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

1073

886

static void handle_sigterm(int sig){

1074

887

if(quit_now){

1075

888

return;

1077

890

quit_now = 1;

1078

891

signal_received = sig;

1079

892

int old_errno = errno;

1080

/* set main loop to exit */

1081

893

if(mc.simple_poll != NULL){

1082

894

avahi_simple_poll_quit(mc.simple_poll);

1083

895

}

1084

896

errno = old_errno;

1085

897

}

1086

898

1087

/*

1088

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

1089

* corresponds to an acceptable network device.

1090

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

1091

*/

1092

int good_interface(const struct dirent *if_entry){

1093

ssize_t ssret;

1094

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

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

1099

if_entry->d_name);

1100

if(ret < 0){

1101

perror_plus("asprintf");

1102

return 0;

1103

}

1104

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

1105

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1108

return 0;

1109

}

1110

free(flagname);

1111

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

1112

/* read line from flags_fd */

1113

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1114

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

1115

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

1116

if(flagstring == NULL){

1117

perror_plus("malloc");

1118

close(flags_fd);

1119

return 0;

1120

}

1121

while(to_read > 0){

1122

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

1123

(size_t)to_read));

1124

if(ssret == -1){

1125

perror_plus("read");

1126

free(flagstring);

1127

close(flags_fd);

1128

return 0;

1129

}

1130

to_read -= ssret;

1131

if(ssret == 0){

1132

break;

1133

}

1134

}

1135

close(flags_fd);

1136

intmax_t tmpmax;

1137

char *tmp;

1138

errno = 0;

1139

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

1140

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

1141

and not (isspace(*tmp)))

1142

or tmpmax != (ifreq_flags)tmpmax){

1143

if(debug){

1144

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

1145

flagstring, if_entry->d_name);

1146

}

1147

free(flagstring);

1148

return 0;

1149

}

1150

free(flagstring);

1151

ifreq_flags flags = (ifreq_flags)tmpmax;

1152

/* Reject the loopback device */

1153

if(flags & IFF_LOOPBACK){

1154

if(debug){

1155

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

1156

if_entry->d_name);

1157

}

1158

return 0;

1159

}

1160

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

1161

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

1162

if(debug){

1163

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

1164

if_entry->d_name);

1165

}

1166

return 1;

1167

}

1168

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

1169

if(not (flags & IFF_BROADCAST)){

1170

if(debug){

1171

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

1172

if_entry->d_name);

1173

}

1174

return 0;

1175

}

1176

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

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

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

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

/* Accept this device */

1185

if(debug){

1186

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

1187

if_entry->d_name);

1188

}

1189

return 1;

1190

}

1191

1192

int notdotentries(const struct dirent *direntry){

1193

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

1194

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

1195

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

1196

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

1197

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

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

int ret;

1205

struct timespec now;

1206

struct timespec waited_time;

1207

intmax_t block_time;

1208

1209

while(true){

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr,

1213

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

1214

}

1215

ret = avahi_simple_poll_iterate(s, -1);

1216

} else {

1217

if (debug){

1218

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

1219

" or wait\n");

1220

}

1221

/* the current time */

1222

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1223

if(ret == -1){

1224

perror_plus("clock_gettime");

1225

return -1;

1226

}

1227

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

1228

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

1229

waited_time.tv_sec = (now.tv_sec

1230

- mc.current_server->last_seen.tv_sec);

1231

waited_time.tv_nsec = (now.tv_nsec

1232

- mc.current_server->last_seen.tv_nsec);

1233

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

1234

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

1235

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

1236

block_time = ((retry_interval

1237

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

1238

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

1239

1240

if (debug){

1241

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

1242

}

1243

1244

if(block_time <= 0){

1245

ret = start_mandos_communication(mc.current_server->ip,

1246

mc.current_server->port,

1247

mc.current_server->if_index,

1248

mc.current_server->af);

1249

if(ret == 0){

1250

avahi_simple_poll_quit(mc.simple_poll);

1251

return 0;

1252

}

1253

ret = clock_gettime(CLOCK_MONOTONIC,

1254

&mc.current_server->last_seen);

1255

if(ret == -1){

1256

perror_plus("clock_gettime");

1257

return -1;

1258

}

1259

mc.current_server = mc.current_server->next;

1260

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

1261

servers, but don't block */

1262

}

1263

1264

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

1265

}

1266

if(ret != 0){

1267

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

1268

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

1269

}

1270

}

1271

}

1272

}

1273

1274

899

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

1275

900

AvahiSServiceBrowser *sb = NULL;

1276

901

int error;

1278

903

intmax_t tmpmax;

1279

904

char *tmp;

1280

905

int exitcode = EXIT_SUCCESS;

1281

const char *interface = "";

906

const char *interface = "eth0";

1282

907

struct ifreq network;

1283

908

int sd = -1;

1284

909

bool take_down_interface = false;

1285

910

uid_t uid;

1286

911

gid_t gid;

912

char *connect_to = NULL;

1287

913

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

1288

914

bool tempdir_created = false;

1289

915

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1293

919

bool gnutls_initialized = false;

1294

920

bool gpgme_initialized = false;

1295

921

float delay = 2.5f;

1296

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

1297

retrying the same server again */

1298

922

1299

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

923

struct sigaction old_sigterm_action;

1300

924

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1301

925

1302

uid = getuid();

1303

gid = getgid();

1304

1305

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

1306

errno = 0;

1307

ret = setgid(gid);

1308

if(ret == -1){

1309

perror_plus("setgid");

1310

}

1311

1312

/* Lower user privileges (temporarily) */

1313

errno = 0;

1314

ret = seteuid(uid);

1315

if(ret == -1){

1316

perror_plus("seteuid");

1317

}

1318

1319

if(quit_now){

1320

goto end;

1321

}

1322

1323

926

{

1324

927

struct argp_option options[] = {

1325

928

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

1354

957

.arg = "SECONDS",

1355

958

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

1356

959

.group = 2 },

1357

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

1358

.arg = "SECONDS",

1359

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

1360

.group = 2 },

1361

/*

1362

* These reproduce what we would get without ARGP_NO_HELP

1363

*/

1364

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

1365

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

1366

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

1367

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

1368

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

1369

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

1370

960

{ .name = NULL }

1371

961

};

1372

962

1373

963

error_t parse_opt(int key, char *arg,

1374

964

struct argp_state *state){

1375

errno = 0;

1376

965

switch(key){

1377

966

case 128: /* --debug */

1378

967

debug = true;

1394

983

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

1395

984

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

1396

985

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

1397

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

986

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

987

exit(EXIT_FAILURE);

1398

988

}

1399

989

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

1400

990

break;

1405

995

errno = 0;

1406

996

delay = strtof(arg, &tmp);

1407

997

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

1408

argp_error(state, "Bad delay");

1409

}

1410

case 132: /* --retry */

1411

errno = 0;

1412

retry_interval = strtod(arg, &tmp);

1413

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

1414

or (retry_interval * 1000) > INT_MAX){

1415

argp_error(state, "Bad retry interval");

998

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

999

exit(EXIT_FAILURE);

1416

1000

}

1417

1001

break;

1418

/*

1419

* These reproduce what we would get without ARGP_NO_HELP

1420

*/

1421

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

1422

argp_state_help(state, state->out_stream,

1423

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1424

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1425

case -3: /* --usage */

1426

argp_state_help(state, state->out_stream,

1427

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1428

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

1429

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

1430

exit(argp_err_exit_status);

1002

case ARGP_KEY_ARG:

1003

argp_usage(state);

1004

case ARGP_KEY_END:

1431

1005

break;

1432

1006

default:

1433

1007

return ARGP_ERR_UNKNOWN;

1434

1008

}

1435

return errno;

1009

return 0;

1436

1010

}

1437

1011

1438

1012

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

1439

1013

.args_doc = "",

1440

1014

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

1441

1015

" passwords from a Mandos server" };

1442

ret = argp_parse(&argp, argc, argv,

1443

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1444

switch(ret){

1445

case 0:

1446

break;

1447

case ENOMEM:

1448

default:

1449

errno = ret;

1450

perror_plus("argp_parse");

1451

exitcode = EX_OSERR;

1452

goto end;

1453

case EINVAL:

1454

exitcode = EX_USAGE;

1455

goto end;

1456

}

1457

}

1458

1459

{

1460

/* Work around Debian bug #633582:

1461

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

1462

struct stat st;

1463

1464

/* Re-raise priviliges */

1465

errno = 0;

1466

ret = seteuid(0);

1467

if(ret == -1){

1468

perror_plus("seteuid");

1469

}

1470

1471

int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);

1472

if(seckey_fd == -1){

1473

perror_plus("open");

1474

} else {

1475

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

1476

if(ret == -1){

1477

perror_plus("fstat");

1478

} else {

1479

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

1480

ret = fchown(seckey_fd, uid, gid);

1481

if(ret == -1){

1482

perror_plus("fchown");

1483

}

1484

}

1485

}

1486

TEMP_FAILURE_RETRY(close(seckey_fd));

1487

}

1488

1489

int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);

1490

if(pubkey_fd == -1){

1491

perror_plus("open");

1492

} else {

1493

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

1494

if(ret == -1){

1495

perror_plus("fstat");

1496

} else {

1497

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

1498

ret = fchown(pubkey_fd, uid, gid);

1499

if(ret == -1){

1500

perror_plus("fchown");

1501

}

1502

}

1503

}

1504

TEMP_FAILURE_RETRY(close(pubkey_fd));

1505

}

1506

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror_plus("seteuid");

1016

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

1017

if(ret == ARGP_ERR_UNKNOWN){

1018

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

1019

exitcode = EXIT_FAILURE;

1020

goto end;

1512

1021

}

1513

1022

}

1514

1023

1515

1024

if(not debug){

1516

1025

avahi_set_log_function(empty_log);

1517

1026

}

1518

1519

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

1520

struct dirent **direntries;

1521

ret = scandir(sys_class_net, &direntries, good_interface,

1522

alphasort);

1523

if(ret >= 1){

1524

/* Pick the first good interface */

1525

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

1526

if(debug){

1527

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

1528

}

1529

if(interface == NULL){

1530

perror_plus("malloc");

1531

free(direntries);

1532

exitcode = EXIT_FAILURE;

1533

goto end;

1534

}

1535

free(direntries);

1536

} else {

1537

free(direntries);

1538

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

1539

exitcode = EXIT_FAILURE;

1540

goto end;

1541

}

1542

}

1543

1027

1544

1028

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

1545

1029

from the signal handler */

1548

1032

mc.simple_poll = avahi_simple_poll_new();

1549

1033

if(mc.simple_poll == NULL){

1550

1034

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

1551

exitcode = EX_UNAVAILABLE;

1035

exitcode = EXIT_FAILURE;

1552

1036

goto end;

1553

1037

}

1554

1038

1555

1039

sigemptyset(&sigterm_action.sa_mask);

1556

1040

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

1557

1041

if(ret == -1){

1558

perror_plus("sigaddset");

1559

exitcode = EX_OSERR;

1042

perror("sigaddset");

1043

exitcode = EXIT_FAILURE;

1560

1044

goto end;

1561

1045

}

1562

1046

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

1563

1047

if(ret == -1){

1564

perror_plus("sigaddset");

1565

exitcode = EX_OSERR;

1048

perror("sigaddset");

1049

exitcode = EXIT_FAILURE;

1566

1050

goto end;

1567

1051

}

1568

1052

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

1569

1053

if(ret == -1){

1570

perror_plus("sigaddset");

1571

exitcode = EX_OSERR;

1572

goto end;

1573

}

1574

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

1575

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

1576

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

1577

*/

1578

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

1579

if(ret == -1){

1580

perror_plus("sigaction");

1581

return EX_OSERR;

1582

}

1583

if(old_sigterm_action.sa_handler != SIG_IGN){

1584

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

1585

if(ret == -1){

1586

perror_plus("sigaction");

1587

exitcode = EX_OSERR;

1588

goto end;

1589

}

1590

}

1591

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

1592

if(ret == -1){

1593

perror_plus("sigaction");

1594

return EX_OSERR;

1595

}

1596

if(old_sigterm_action.sa_handler != SIG_IGN){

1597

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

1598

if(ret == -1){

1599

perror_plus("sigaction");

1600

exitcode = EX_OSERR;

1601

goto end;

1602

}

1603

}

1604

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

1605

if(ret == -1){

1606

perror_plus("sigaction");

1607

return EX_OSERR;

1608

}

1609

if(old_sigterm_action.sa_handler != SIG_IGN){

1610

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

1611

if(ret == -1){

1612

perror_plus("sigaction");

1613

exitcode = EX_OSERR;

1614

goto end;

1615

}

1054

perror("sigaddset");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1058

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

1059

if(ret == -1){

1060

perror("sigaction");

1061

exitcode = EXIT_FAILURE;

1062

goto end;

1063

}

1064

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

1065

if(ret == -1){

1066

perror("sigaction");

1067

exitcode = EXIT_FAILURE;

1068

goto end;

1069

}

1070

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

1071

if(ret == -1){

1072

perror("sigaction");

1073

exitcode = EXIT_FAILURE;

1074

goto end;

1616

1075

}

1617

1076

1618

1077

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

1619

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

1078

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

1620

1079

if_index = (AvahiIfIndex) if_nametoindex(interface);

1621

1080

if(if_index == 0){

1622

1081

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

1623

exitcode = EX_UNAVAILABLE;

1082

exitcode = EXIT_FAILURE;

1624

1083

goto end;

1625

1084

}

1626

1085

1628

1087

goto end;

1629

1088

}

1630

1089

1631

/* Re-raise priviliges */

1632

errno = 0;

1633

ret = seteuid(0);

1634

if(ret == -1){

1635

perror_plus("seteuid");

1636

}

1637

1638

1090

#ifdef __linux__

1639

1091

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1640

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

1092

messages to mess up the prompt */

1641

1093

ret = klogctl(8, NULL, 5);

1642

1094

bool restore_loglevel = true;

1643

1095

if(ret == -1){

1644

1096

restore_loglevel = false;

1645

perror_plus("klogctl");

1097

perror("klogctl");

1646

1098

}

1647

1099

#endif /* __linux__ */

1648

1100

1649

1101

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

1102

if(sd < 0){

1651

perror_plus("socket");

1652

exitcode = EX_OSERR;

1103

perror("socket");

1104

exitcode = EXIT_FAILURE;

1653

1105

#ifdef __linux__

1654

1106

if(restore_loglevel){

1655

1107

ret = klogctl(7, NULL, 0);

1656

1108

if(ret == -1){

1657

perror_plus("klogctl");

1109

perror("klogctl");

1658

1110

}

1659

1111

}

1660

1112

#endif /* __linux__ */

1661

/* Lower privileges */

1662

errno = 0;

1663

ret = seteuid(uid);

1664

if(ret == -1){

1665

perror_plus("seteuid");

1666

}

1667

1113

goto end;

1668

1114

}

1669

1115

strcpy(network.ifr_name, interface);

1670

1116

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

1671

1117

if(ret == -1){

1672

perror_plus("ioctl SIOCGIFFLAGS");

1118

perror("ioctl SIOCGIFFLAGS");

1673

1119

#ifdef __linux__

1674

1120

if(restore_loglevel){

1675

1121

ret = klogctl(7, NULL, 0);

1676

1122

if(ret == -1){

1677

perror_plus("klogctl");

1123

perror("klogctl");

1678

1124

}

1679

1125

}

1680

1126

#endif /* __linux__ */

1681

exitcode = EX_OSERR;

1682

/* Lower privileges */

1683

errno = 0;

1684

ret = seteuid(uid);

1685

if(ret == -1){

1686

perror_plus("seteuid");

1687

}

1127

exitcode = EXIT_FAILURE;

1688

1128

goto end;

1689

1129

}

1690

1130

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

1693

1133

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

1694

1134

if(ret == -1){

1695

1135

take_down_interface = false;

1696

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

exitcode = EX_OSERR;

1136

perror("ioctl SIOCSIFFLAGS");

1137

exitcode = EXIT_FAILURE;

1698

1138

#ifdef __linux__

1699

1139

if(restore_loglevel){

1700

1140

ret = klogctl(7, NULL, 0);

1701

1141

if(ret == -1){

1702

perror_plus("klogctl");

1142

perror("klogctl");

1703

1143

}

1704

1144

}

1705

1145

#endif /* __linux__ */

1706

/* Lower privileges */

1707

errno = 0;

1708

ret = seteuid(uid);

1709

if(ret == -1){

1710

perror_plus("seteuid");

1711

}

1712

1146

goto end;

1713

1147

}

1714

1148

}

1715

/* Sleep checking until interface is running.

1716

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

1149

/* sleep checking until interface is running */

1717

1150

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

1718

1151

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

1719

1152

if(ret == -1){

1720

perror_plus("ioctl SIOCGIFFLAGS");

1153

perror("ioctl SIOCGIFFLAGS");

1721

1154

} else if(network.ifr_flags & IFF_RUNNING){

1722

1155

break;

1723

1156

}

1724

1157

struct timespec sleeptime = { .tv_nsec = 250000000 };

1725

1158

ret = nanosleep(&sleeptime, NULL);

1726

1159

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

1727

perror_plus("nanosleep");

1160

perror("nanosleep");

1728

1161

}

1729

1162

}

1730

1163

if(not take_down_interface){

1731

1164

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

1732

1165

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

1733

1166

if(ret == -1){

1734

perror_plus("close");

1167

perror("close");

1735

1168

}

1736

1169

}

1737

1170

#ifdef __linux__

1739

1172

/* Restores kernel loglevel to default */

1740

1173

ret = klogctl(7, NULL, 0);

1741

1174

if(ret == -1){

1742

perror_plus("klogctl");

1175

perror("klogctl");

1743

1176

}

1744

1177

}

1745

1178

#endif /* __linux__ */

1746

/* Lower privileges */

1747

errno = 0;

1748

if(take_down_interface){

1749

/* Lower privileges */

1750

ret = seteuid(uid);

1751

if(ret == -1){

1752

perror_plus("seteuid");

1753

}

1754

} else {

1755

/* Lower privileges permanently */

1756

ret = setuid(uid);

1757

if(ret == -1){

1758

perror_plus("setuid");

1759

}

1760

}

1179

}

1180

1181

if(quit_now){

1182

goto end;

1183

}

1184

1185

uid = getuid();

1186

gid = getgid();

1187

1188

errno = 0;

1189

setgid(gid);

1190

if(ret == -1){

1191

perror("setgid");

1192

}

1193

1194

ret = setuid(uid);

1195

if(ret == -1){

1196

perror("setuid");

1761

1197

}

1762

1198

1763

1199

if(quit_now){

1767

1203

ret = init_gnutls_global(pubkey, seckey);

1768

1204

if(ret == -1){

1769

1205

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

1770

exitcode = EX_UNAVAILABLE;

1206

exitcode = EXIT_FAILURE;

1771

1207

goto end;

1772

1208

} else {

1773

1209

gnutls_initialized = true;

1777

1213

goto end;

1778

1214

}

1779

1215

1216

tempdir_created = true;

1780

1217

if(mkdtemp(tempdir) == NULL){

1781

perror_plus("mkdtemp");

1218

tempdir_created = false;

1219

perror("mkdtemp");

1782

1220

goto end;

1783

1221

}

1784

tempdir_created = true;

1785

1222

1786

1223

if(quit_now){

1787

1224

goto end;

1789

1226

1790

1227

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

1791

1228

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

1792

exitcode = EX_UNAVAILABLE;

1229

exitcode = EXIT_FAILURE;

1793

1230

goto end;

1794

1231

} else {

1795

1232

gpgme_initialized = true;

1805

1242

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

1806

1243

if(address == NULL){

1807

1244

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

1808

exitcode = EX_USAGE;

1245

exitcode = EXIT_FAILURE;

1809

1246

goto end;

1810

1247

}

1811

1248

1819

1256

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

1820

1257

or tmpmax != (uint16_t)tmpmax){

1821

1258

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

1822

exitcode = EX_USAGE;

1259

exitcode = EXIT_FAILURE;

1823

1260

goto end;

1824

1261

}

1825

1262

1841

1278

if(quit_now){

1842

1279

goto end;

1843

1280

}

1844

1845

while(not quit_now){

1846

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

1847

if(quit_now or ret == 0){

1848

break;

1849

}

1850

sleep((int)retry_interval or 1);

1851

};

1852

1853

if (not quit_now){

1281

1282

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

1283

if(ret < 0){

1284

exitcode = EXIT_FAILURE;

1285

} else {

1854

1286

exitcode = EXIT_SUCCESS;

1855

1287

}

1856

1857

1288

goto end;

1858

1289

}

1859

1290

1883

1314

if(mc.server == NULL){

1884

1315

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

1885

1316

avahi_strerror(error));

1886

exitcode = EX_UNAVAILABLE;

1317

exitcode = EXIT_FAILURE;

1887

1318

goto end;

1888

1319

}

1889

1320

1898

1329

if(sb == NULL){

1899

1330

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

1900

1331

avahi_strerror(avahi_server_errno(mc.server)));

1901

exitcode = EX_UNAVAILABLE;

1332

exitcode = EXIT_FAILURE;

1902

1333

goto end;

1903

1334

}

1904

1335

1911

1342

if(debug){

1912

1343

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

1913

1344

}

1914

1915

ret = avahi_loop_with_timeout(mc.simple_poll,

1916

(int)(retry_interval * 1000));

1917

if(debug){

1918

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

1919

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

1920

}

1345

1346

avahi_simple_poll_loop(mc.simple_poll);

1921

1347

1922

1348

end:

1923

1349

1944

1370

if(gpgme_initialized){

1945

1371

gpgme_release(mc.ctx);

1946

1372

}

1947

1948

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

1949

has seen */

1950

if(mc.current_server != NULL){

1951

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

1952

while(mc.current_server != NULL){

1953

server *next = mc.current_server->next;

1954

free(mc.current_server);

1955

mc.current_server = next;

1956

}

1957

}

1958

1373

1959

1374

/* Take down the network interface */

1960

1375

if(take_down_interface){

1961

/* Re-raise priviliges */

1962

errno = 0;

1963

ret = seteuid(0);

1376

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

1964

1377

if(ret == -1){

1965

perror_plus("seteuid");

1378

perror("ioctl SIOCGIFFLAGS");

1379

} else if(network.ifr_flags & IFF_UP) {

1380

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

1381

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

1382

if(ret == -1){

1383

perror("ioctl SIOCSIFFLAGS");

1384

}

1966

1385

}

1967

if(geteuid() == 0){

1968

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

1969

if(ret == -1){

1970

perror_plus("ioctl SIOCGIFFLAGS");

1971

} else if(network.ifr_flags & IFF_UP) {

1972

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

1973

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

1974

if(ret == -1){

1975

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1976

}

1977

}

1978

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

1979

if(ret == -1){

1980

perror_plus("close");

1981

}

1982

/* Lower privileges permanently */

1983

errno = 0;

1984

ret = setuid(uid);

1985

if(ret == -1){

1986

perror_plus("setuid");

1987

}

1386

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

1387

if(ret == -1){

1388

perror("close");

1988

1389

}

1989

1390

}

1990

1391

1991

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

1392

/* Removes the temp directory used by GPGME */

1992

1393

if(tempdir_created){

1993

struct dirent **direntries = NULL;

1994

struct dirent *direntry = NULL;

1995

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1996

if (ret > 0){

1997

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

1998

direntry = direntries[i];

1394

DIR *d;

1395

struct dirent *direntry;

1396

d = opendir(tempdir);

1397

if(d == NULL){

1398

if(errno != ENOENT){

1399

perror("opendir");

1400

}

1401

} else {

1402

while(true){

1403

direntry = readdir(d);

1404

if(direntry == NULL){

1405

break;

1406

}

1407

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

1408

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

1409

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

1410

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

1411

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

1412

continue;

1413

}

1999

1414

char *fullname = NULL;

2000

1415

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

2001

1416

direntry->d_name);

2002

1417

if(ret < 0){

2003

perror_plus("asprintf");

1418

perror("asprintf");

2004

1419

continue;

2005

1420

}

2006

1421

ret = remove(fullname);

2010

1425

}

2011

1426

free(fullname);

2012

1427

}

2013

}

2014

2015

/* need to be cleaned even if ret == 0 because man page doesn't

2016

specify */

2017

free(direntries);

2018

if (ret == -1){

2019

perror_plus("scandir");

1428

closedir(d);

2020

1429

}

2021

1430

ret = rmdir(tempdir);

2022

1431

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

2023

perror_plus("rmdir");

1432

perror("rmdir");

2024

1433

}

2025

1434

}

2026

1435

2027

1436

if(quit_now){

2028

sigemptyset(&old_sigterm_action.sa_mask);

2029

old_sigterm_action.sa_handler = SIG_DFL;

2030

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

2031

&old_sigterm_action,

2032

NULL));

1437

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

2033

1438

if(ret == -1){

2034

perror_plus("sigaction");

2035

}

2036

do {

2037

ret = raise(signal_received);

2038

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

2039

if(ret != 0){

2040

perror_plus("raise");

2041

abort();

2042

}

2043

TEMP_FAILURE_RETRY(pause());

1439

perror("sigaction");

1440

}

1441

raise(signal_received);

2044

1442

}

2045

1443

2046

1444

return exitcode;