/mandos/release : revision 237.7.33

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, 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() */

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,

80

81

argp_parse(), ARGP_KEY_ARG,

81

82

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

83

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

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

84

sigaction(), SIGTERM, sig_atomic_t,

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() */

125

128

static const char mandos_protocol_version[] = "1";

126

129

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

127

130

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;

128

144

129

145

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

130

146

typedef struct {

135

151

gnutls_dh_params_t dh_params;

136

152

const char *priority;

137

153

gpgme_ctx_t ctx;

154

server *current_server;

138

155

} mandos_context;

139

156

140

157

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

141

158

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

142

159

.dh_bits = 1024, .priority = "SECURE256"

143

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

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

}

144

172

145

173

/*

146

174

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

159

187

return buffer_capacity;

160

188

}

161

189

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

162

227

/*

163

228

* Initialize GPGME.

164

229

*/

165

230

static bool init_gpgme(const char *seckey,

166

231

const char *pubkey, const char *tempdir){

167

int ret;

168

232

gpgme_error_t rc;

169

233

gpgme_engine_info_t engine_info;

170

234

173

237

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

174

238

*/

175

239

bool import_key(const char *filename){

240

int ret;

176

241

int fd;

177

242

gpgme_data_t pgp_data;

178

243

179

244

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

180

245

if(fd == -1){

181

perror("open");

246

perror_plus("open");

182

247

return false;

183

248

}

184

249

198

263

199

264

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

200

265

if(ret == -1){

201

perror("close");

266

perror_plus("close");

202

267

}

203

268

gpgme_data_release(pgp_data);

204

269

return true;

249

314

return false;

250

315

}

251

316

252

return true;

317

return true;

253

318

}

254

319

255

320

/*

329

394

330

395

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

331

396

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

332

perror("gpgme_data_seek");

397

perror_plus("gpgme_data_seek");

333

398

plaintext_length = -1;

334

399

goto decrypt_end;

335

400

}

340

405

(size_t)plaintext_length,

341

406

plaintext_capacity);

342

407

if(plaintext_capacity == 0){

343

perror("incbuffer");

408

perror_plus("incbuffer");

344

409

plaintext_length = -1;

345

410

goto decrypt_end;

346

411

}

353

418

break;

354

419

}

355

420

if(ret < 0){

356

perror("gpgme_data_read");

421

perror_plus("gpgme_data_read");

357

422

plaintext_length = -1;

358

423

goto decrypt_end;

359

424

}

416

481

}

417

482

418

483

/* OpenPGP credentials */

419

gnutls_certificate_allocate_credentials(&mc.cred);

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

420

485

if(ret != GNUTLS_E_SUCCESS){

421

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

422

from

423

-Wunreachable-code

424

*/

486

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

425

487

safer_gnutls_strerror(ret));

426

488

gnutls_global_deinit();

427

489

return -1;

474

536

static int init_gnutls_session(gnutls_session_t *session){

475

537

int ret;

476

538

/* GnuTLS session creation */

477

ret = gnutls_init(session, GNUTLS_SERVER);

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);

478

545

if(ret != GNUTLS_E_SUCCESS){

479

546

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

480

547

safer_gnutls_strerror(ret));

482

549

483

550

{

484

551

const char *err;

485

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

486

559

if(ret != GNUTLS_E_SUCCESS){

487

560

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

488

561

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

492

565

}

493

566

}

494

567

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

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);

497

576

if(ret != GNUTLS_E_SUCCESS){

498

577

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

499

578

safer_gnutls_strerror(ret));

502

581

}

503

582

504

583

/* ignore client certificate if any. */

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

584

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

585

508

586

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

509

587

518

596

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

519

597

AvahiIfIndex if_index,

520

598

int af){

521

int ret, tcp_sd;

599

int ret, tcp_sd = -1;

522

600

ssize_t sret;

523

601

union {

524

602

struct sockaddr_in in;

525

603

struct sockaddr_in6 in6;

526

604

} to;

527

605

char *buffer = NULL;

528

char *decrypted_buffer;

606

char *decrypted_buffer = NULL;

529

607

size_t buffer_length = 0;

530

608

size_t buffer_capacity = 0;

531

ssize_t decrypted_buffer_size;

532

609

size_t written;

533

int retval = 0;

610

int retval = -1;

534

611

gnutls_session_t session;

535

612

int pf; /* Protocol family */

536

613

614

errno = 0;

615

616

if(quit_now){

617

errno = EINTR;

618

return -1;

619

}

620

537

621

switch(af){

538

622

case AF_INET6:

539

623

pf = PF_INET6;

543

627

break;

544

628

default:

545

629

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

630

errno = EINVAL;

546

631

return -1;

547

632

}

548

633

558

643

559

644

tcp_sd = socket(pf, SOCK_STREAM, 0);

560

645

if(tcp_sd < 0){

561

perror("socket");

562

return -1;

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;

563

655

}

564

656

565

657

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

571

663

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

572

664

}

573

665

if(ret < 0 ){

574

perror("inet_pton");

575

return -1;

666

int e = errno;

667

perror_plus("inet_pton");

668

errno = e;

669

goto mandos_end;

576

670

}

577

671

if(ret == 0){

672

int e = errno;

578

673

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

579

return -1;

674

errno = e;

675

goto mandos_end;

580

676

}

581

677

if(af == AF_INET6){

582

678

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

589

685

if(if_index == AVAHI_IF_UNSPEC){

590

686

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

591

687

" without a network interface\n");

592

return -1;

688

errno = EINVAL;

689

goto mandos_end;

593

690

}

594

691

/* Set the network interface number as scope */

595

692

to.in6.sin6_scope_id = (uint32_t)if_index;

600

697

-Wunreachable-code */

601

698

}

602

699

700

if(quit_now){

701

errno = EINTR;

702

goto mandos_end;

703

}

704

603

705

if(debug){

604

706

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

605

707

char interface[IF_NAMESIZE];

606

708

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

607

perror("if_indextoname");

709

perror_plus("if_indextoname");

608

710

} else {

609

711

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

610

712

ip, interface, port);

624

726

sizeof(addrstr));

625

727

}

626

728

if(pcret == NULL){

627

perror("inet_ntop");

729

perror_plus("inet_ntop");

628

730

} else {

629

731

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

630

732

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

632

734

}

633

735

}

634

736

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

635

742

if(af == AF_INET6){

636

743

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

637

744

} else {

638

745

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

639

746

}

640

747

if(ret < 0){

641

perror("connect");

642

return -1;

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;

643

759

}

644

760

645

761

const char *out = mandos_protocol_version;

649

765

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

650

766

out_size - written));

651

767

if(ret == -1){

652

perror("write");

653

retval = -1;

768

int e = errno;

769

perror_plus("write");

770

errno = e;

654

771

goto mandos_end;

655

772

}

656

773

written += (size_t)ret;

664

781

break;

665

782

}

666

783

}

784

785

if(quit_now){

786

errno = EINTR;

787

goto mandos_end;

788

}

667

789

}

668

790

669

791

if(debug){

670

792

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

671

793

}

672

794

795

if(quit_now){

796

errno = EINTR;

797

goto mandos_end;

798

}

799

800

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

673

801

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

674

802

675

do{

803

if(quit_now){

804

errno = EINTR;

805

goto mandos_end;

806

}

807

808

do {

676

809

ret = gnutls_handshake(session);

810

if(quit_now){

811

errno = EINTR;

812

goto mandos_end;

813

}

677

814

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

678

815

679

816

if(ret != GNUTLS_E_SUCCESS){

681

818

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

682

819

gnutls_perror(ret);

683

820

}

684

retval = -1;

821

errno = EPROTO;

685

822

goto mandos_end;

686

823

}

687

824

693

830

}

694

831

695

832

while(true){

833

834

if(quit_now){

835

errno = EINTR;

836

goto mandos_end;

837

}

838

696

839

buffer_capacity = incbuffer(&buffer, buffer_length,

697

840

buffer_capacity);

698

841

if(buffer_capacity == 0){

699

perror("incbuffer");

700

retval = -1;

842

int e = errno;

843

perror_plus("incbuffer");

844

errno = e;

845

goto mandos_end;

846

}

847

848

if(quit_now){

849

errno = EINTR;

701

850

goto mandos_end;

702

851

}

703

852

712

861

case GNUTLS_E_AGAIN:

713

862

break;

714

863

case GNUTLS_E_REHANDSHAKE:

715

do{

864

do {

716

865

ret = gnutls_handshake(session);

866

867

if(quit_now){

868

errno = EINTR;

869

goto mandos_end;

870

}

717

871

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

718

872

if(ret < 0){

719

873

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

720

874

gnutls_perror(ret);

721

retval = -1;

875

errno = EPROTO;

722

876

goto mandos_end;

723

877

}

724

878

break;

725

879

default:

726

880

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

727

881

" encrypted session with Mandos server\n");

728

retval = -1;

729

882

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

errno = EIO;

730

884

goto mandos_end;

731

885

}

732

886

} else {

738

892

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

739

893

}

740

894

741

gnutls_bye(session, GNUTLS_SHUT_RDWR);

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);

742

907

743

908

if(buffer_length > 0){

909

ssize_t decrypted_buffer_size;

744

910

decrypted_buffer_size = pgp_packet_decrypt(buffer,

745

911

buffer_length,

746

912

&decrypted_buffer);

747

913

if(decrypted_buffer_size >= 0){

914

748

915

written = 0;

749

916

while(written < (size_t) decrypted_buffer_size){

917

if(quit_now){

918

errno = EINTR;

919

goto mandos_end;

920

}

921

750

922

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

751

923

(size_t)decrypted_buffer_size - written,

752

924

stdout);

753

925

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

926

int e = errno;

754

927

if(debug){

755

928

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

756

929

strerror(errno));

757

930

}

758

retval = -1;

759

break;

931

errno = e;

932

goto mandos_end;

760

933

}

761

934

written += (size_t)ret;

762

935

}

763

free(decrypted_buffer);

764

} else {

765

retval = -1;

936

retval = 0;

766

937

}

767

} else {

768

retval = -1;

769

938

}

770

939

771

940

/* Shutdown procedure */

772

941

773

942

mandos_end:

774

free(buffer);

775

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

776

if(ret == -1){

777

perror("close");

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

}

778

962

}

779

gnutls_deinit(session);

780

963

return retval;

781

964

}

782

965

799

982

/* Called whenever a service has been resolved successfully or

800

983

timed out */

801

984

985

if(quit_now){

986

return;

987

}

988

802

989

switch(event){

803

990

default:

804

991

case AVAHI_RESOLVER_FAILURE:

820

1007

avahi_proto_to_af(proto));

821

1008

if(ret == 0){

822

1009

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

823

1013

}

824

1014

}

825

1015

}

841

1031

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

842

1032

is removed from the LAN */

843

1033

1034

if(quit_now){

1035

return;

1036

}

1037

844

1038

switch(event){

845

1039

default:

846

1040

case AVAHI_BROWSER_FAILURE:

875

1069

}

876

1070

}

877

1071

878

sig_atomic_t quit_now = 0;

879

880

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

881

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

1072

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

1073

static void handle_sigterm(int sig){

882

1074

if(quit_now){

883

1075

return;

884

1076

}

885

1077

quit_now = 1;

1078

signal_received = sig;

886

1079

int old_errno = errno;

1080

/* set main loop to exit */

887

1081

if(mc.simple_poll != NULL){

888

1082

avahi_simple_poll_quit(mc.simple_poll);

889

1083

}

890

1084

errno = old_errno;

891

1085

}

892

1086

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

893

1274

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

894

1275

AvahiSServiceBrowser *sb = NULL;

895

1276

int error;

897

1278

intmax_t tmpmax;

898

1279

char *tmp;

899

1280

int exitcode = EXIT_SUCCESS;

900

const char *interface = "eth0";

1281

const char *interface = "";

901

1282

struct ifreq network;

902

1283

int sd = -1;

903

bool interface_taken_up = false;

1284

bool take_down_interface = false;

904

1285

uid_t uid;

905

1286

gid_t gid;

906

char *connect_to = NULL;

907

1287

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

908

1288

bool tempdir_created = false;

909

1289

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

913

1293

bool gnutls_initialized = false;

914

1294

bool gpgme_initialized = false;

915

1295

float delay = 2.5f;

1296

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

1297

retrying the same server again */

916

1298

917

struct sigaction old_sigterm_action;

1299

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

1300

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

919

1301

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

920

1323

{

921

1324

struct argp_option options[] = {

922

1325

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

951

1354

.arg = "SECONDS",

952

1355

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

953

1356

.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 },

954

1370

{ .name = NULL }

955

1371

};

956

1372

957

1373

error_t parse_opt(int key, char *arg,

958

1374

struct argp_state *state){

1375

errno = 0;

959

1376

switch(key){

960

1377

case 128: /* --debug */

961

1378

debug = true;

977

1394

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

978

1395

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

979

1396

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

980

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

981

exit(EXIT_FAILURE);

1397

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

982

1398

}

983

1399

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

984

1400

break;

989

1405

errno = 0;

990

1406

delay = strtof(arg, &tmp);

991

1407

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

992

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

993

exit(EXIT_FAILURE);

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");

994

1416

}

995

1417

break;

996

case ARGP_KEY_ARG:

997

argp_usage(state);

998

case ARGP_KEY_END:

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);

999

1431

break;

1000

1432

default:

1001

1433

return ARGP_ERR_UNKNOWN;

1002

1434

}

1003

return 0;

1435

return errno;

1004

1436

}

1005

1437

1006

1438

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

1007

1439

.args_doc = "",

1008

1440

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

1009

1441

" passwords from a Mandos server" };

1010

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

1011

if(ret == ARGP_ERR_UNKNOWN){

1012

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

1013

exitcode = EXIT_FAILURE;

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;

1014

1455

goto end;

1015

1456

}

1016

1457

}

1018

1459

if(not debug){

1019

1460

avahi_set_log_function(empty_log);

1020

1461

}

1462

1463

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

1464

struct dirent **direntries;

1465

ret = scandir(sys_class_net, &direntries, good_interface,

1466

alphasort);

1467

if(ret >= 1){

1468

/* Pick the first good interface */

1469

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

1470

if(debug){

1471

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

1472

}

1473

if(interface == NULL){

1474

perror_plus("malloc");

1475

free(direntries);

1476

exitcode = EXIT_FAILURE;

1477

goto end;

1478

}

1479

free(direntries);

1480

} else {

1481

free(direntries);

1482

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

1483

exitcode = EXIT_FAILURE;

1484

goto end;

1485

}

1486

}

1021

1487

1022

1488

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

1023

1489

from the signal handler */

1026

1492

mc.simple_poll = avahi_simple_poll_new();

1027

1493

if(mc.simple_poll == NULL){

1028

1494

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

1029

exitcode = EXIT_FAILURE;

1495

exitcode = EX_UNAVAILABLE;

1030

1496

goto end;

1031

1497

}

1032

1498

1033

1499

sigemptyset(&sigterm_action.sa_mask);

1034

1500

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

1035

1501

if(ret == -1){

1036

perror("sigaddset");

1037

exitcode = EXIT_FAILURE;

1502

perror_plus("sigaddset");

1503

exitcode = EX_OSERR;

1038

1504

goto end;

1039

1505

}

1040

1506

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

1041

1507

if(ret == -1){

1042

perror("sigaddset");

1043

exitcode = EXIT_FAILURE;

1508

perror_plus("sigaddset");

1509

exitcode = EX_OSERR;

1044

1510

goto end;

1045

1511

}

1046

1512

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

1047

1513

if(ret == -1){

1048

perror("sigaddset");

1049

exitcode = EXIT_FAILURE;

1050

goto end;

1051

}

1052

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

1053

if(ret == -1){

1054

perror("sigaction");

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1514

perror_plus("sigaddset");

1515

exitcode = EX_OSERR;

1516

goto end;

1517

}

1518

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

1519

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

1520

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

1521

*/

1522

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

1523

if(ret == -1){

1524

perror_plus("sigaction");

1525

return EX_OSERR;

1526

}

1527

if(old_sigterm_action.sa_handler != SIG_IGN){

1528

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

1529

if(ret == -1){

1530

perror_plus("sigaction");

1531

exitcode = EX_OSERR;

1532

goto end;

1533

}

1534

}

1535

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

1536

if(ret == -1){

1537

perror_plus("sigaction");

1538

return EX_OSERR;

1539

}

1540

if(old_sigterm_action.sa_handler != SIG_IGN){

1541

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

1542

if(ret == -1){

1543

perror_plus("sigaction");

1544

exitcode = EX_OSERR;

1545

goto end;

1546

}

1547

}

1548

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

1549

if(ret == -1){

1550

perror_plus("sigaction");

1551

return EX_OSERR;

1552

}

1553

if(old_sigterm_action.sa_handler != SIG_IGN){

1554

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

1555

if(ret == -1){

1556

perror_plus("sigaction");

1557

exitcode = EX_OSERR;

1558

goto end;

1559

}

1560

}

1058

1561

1059

1562

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

1060

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

1563

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

1564

if_index = (AvahiIfIndex) if_nametoindex(interface);

1565

if(if_index == 0){

1566

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

1567

exitcode = EX_UNAVAILABLE;

1568

goto end;

1569

}

1570

1571

if(quit_now){

1572

goto end;

1573

}

1574

1575

/* Re-raise priviliges */

1576

errno = 0;

1577

ret = seteuid(0);

1578

if(ret == -1){

1579

perror_plus("seteuid");

1580

}

1581

1061

1582

#ifdef __linux__

1062

1583

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1063

messages to mess up the prompt */

1584

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

1064

1585

ret = klogctl(8, NULL, 5);

1065

1586

bool restore_loglevel = true;

1066

1587

if(ret == -1){

1067

1588

restore_loglevel = false;

1068

perror("klogctl");

1589

perror_plus("klogctl");

1069

1590

}

1070

1591

#endif /* __linux__ */

1071

1592

1072

1593

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1073

1594

if(sd < 0){

1074

perror("socket");

1075

exitcode = EXIT_FAILURE;

1595

perror_plus("socket");

1596

exitcode = EX_OSERR;

1076

1597

#ifdef __linux__

1077

1598

if(restore_loglevel){

1078

1599

ret = klogctl(7, NULL, 0);

1079

1600

if(ret == -1){

1080

perror("klogctl");

1601

perror_plus("klogctl");

1081

1602

}

1082

1603

}

1083

1604

#endif /* __linux__ */

1605

/* Lower privileges */

1606

errno = 0;

1607

ret = seteuid(uid);

1608

if(ret == -1){

1609

perror_plus("seteuid");

1610

}

1084

1611

goto end;

1085

1612

}

1086

1613

strcpy(network.ifr_name, interface);

1087

1614

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

1088

1615

if(ret == -1){

1089

perror("ioctl SIOCGIFFLAGS");

1616

perror_plus("ioctl SIOCGIFFLAGS");

1090

1617

#ifdef __linux__

1091

1618

if(restore_loglevel){

1092

1619

ret = klogctl(7, NULL, 0);

1093

1620

if(ret == -1){

1094

perror("klogctl");

1621

perror_plus("klogctl");

1095

1622

}

1096

1623

}

1097

1624

#endif /* __linux__ */

1098

exitcode = EXIT_FAILURE;

1625

exitcode = EX_OSERR;

1626

/* Lower privileges */

1627

errno = 0;

1628

ret = seteuid(uid);

1629

if(ret == -1){

1630

perror_plus("seteuid");

1631

}

1099

1632

goto end;

1100

1633

}

1101

1634

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

1102

1635

network.ifr_flags |= IFF_UP;

1636

take_down_interface = true;

1103

1637

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

1104

1638

if(ret == -1){

1105

perror("ioctl SIOCSIFFLAGS");

1106

exitcode = EXIT_FAILURE;

1639

take_down_interface = false;

1640

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1641

exitcode = EX_OSERR;

1107

1642

#ifdef __linux__

1108

1643

if(restore_loglevel){

1109

1644

ret = klogctl(7, NULL, 0);

1110

1645

if(ret == -1){

1111

perror("klogctl");

1646

perror_plus("klogctl");

1112

1647

}

1113

1648

}

1114

1649

#endif /* __linux__ */

1650

/* Lower privileges */

1651

errno = 0;

1652

ret = seteuid(uid);

1653

if(ret == -1){

1654

perror_plus("seteuid");

1655

}

1115

1656

goto end;

1116

1657

}

1117

interface_taken_up = true;

1118

1658

}

1119

/* sleep checking until interface is running */

1659

/* Sleep checking until interface is running.

1660

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

1120

1661

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

1121

1662

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

1122

1663

if(ret == -1){

1123

perror("ioctl SIOCGIFFLAGS");

1664

perror_plus("ioctl SIOCGIFFLAGS");

1124

1665

} else if(network.ifr_flags & IFF_RUNNING){

1125

1666

break;

1126

1667

}

1127

1668

struct timespec sleeptime = { .tv_nsec = 250000000 };

1128

1669

ret = nanosleep(&sleeptime, NULL);

1129

1670

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

1130

perror("nanosleep");

1671

perror_plus("nanosleep");

1131

1672

}

1132

1673

}

1133

if(not interface_taken_up){

1674

if(not take_down_interface){

1675

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

1134

1676

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

1135

1677

if(ret == -1){

1136

perror("close");

1678

perror_plus("close");

1137

1679

}

1138

1680

}

1139

1681

#ifdef __linux__

1141

1683

/* Restores kernel loglevel to default */

1142

1684

ret = klogctl(7, NULL, 0);

1143

1685

if(ret == -1){

1144

perror("klogctl");

1686

perror_plus("klogctl");

1145

1687

}

1146

1688

}

1147

1689

#endif /* __linux__ */

1148

}

1149

1150

uid = getuid();

1151

gid = getgid();

1152

1153

errno = 0;

1154

setgid(gid);

1155

if(ret == -1){

1156

perror("setgid");

1157

}

1158

1159

ret = setuid(uid);

1160

if(ret == -1){

1161

perror("setuid");

1690

/* Lower privileges */

1691

errno = 0;

1692

if(take_down_interface){

1693

/* Lower privileges */

1694

ret = seteuid(uid);

1695

if(ret == -1){

1696

perror_plus("seteuid");

1697

}

1698

} else {

1699

/* Lower privileges permanently */

1700

ret = setuid(uid);

1701

if(ret == -1){

1702

perror_plus("setuid");

1703

}

1704

}

1705

}

1706

1707

if(quit_now){

1708

goto end;

1162

1709

}

1163

1710

1164

1711

ret = init_gnutls_global(pubkey, seckey);

1165

1712

if(ret == -1){

1166

1713

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

1167

exitcode = EXIT_FAILURE;

1714

exitcode = EX_UNAVAILABLE;

1168

1715

goto end;

1169

1716

} else {

1170

1717

gnutls_initialized = true;

1171

1718

}

1172

1719

1720

if(quit_now){

1721

goto end;

1722

}

1723

1173

1724

if(mkdtemp(tempdir) == NULL){

1174

perror("mkdtemp");

1725

perror_plus("mkdtemp");

1175

1726

goto end;

1176

1727

}

1177

1728

tempdir_created = true;

1178

1729

1730

if(quit_now){

1731

goto end;

1732

}

1733

1179

1734

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

1180

1735

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

1181

exitcode = EXIT_FAILURE;

1736

exitcode = EX_UNAVAILABLE;

1182

1737

goto end;

1183

1738

} else {

1184

1739

gpgme_initialized = true;

1185

1740

}

1186

1741

1187

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

1188

if_index = (AvahiIfIndex) if_nametoindex(interface);

1189

if(if_index == 0){

1190

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

1191

exitcode = EXIT_FAILURE;

1192

goto end;

1193

}

1742

if(quit_now){

1743

goto end;

1194

1744

}

1195

1745

1196

1746

if(connect_to != NULL){

1199

1749

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

1200

1750

if(address == NULL){

1201

1751

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

1202

exitcode = EXIT_FAILURE;

1203

goto end;

1204

}

1752

exitcode = EX_USAGE;

1753

goto end;

1754

}

1755

1756

if(quit_now){

1757

goto end;

1758

}

1759

1205

1760

uint16_t port;

1206

1761

errno = 0;

1207

1762

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

1208

1763

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

1209

1764

or tmpmax != (uint16_t)tmpmax){

1210

1765

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

1211

exitcode = EXIT_FAILURE;

1212

goto end;

1213

}

1766

exitcode = EX_USAGE;

1767

goto end;

1768

}

1769

1770

if(quit_now){

1771

goto end;

1772

}

1773

1214

1774

port = (uint16_t)tmpmax;

1215

1775

*address = '\0';

1216

1776

address = connect_to;

1221

1781

} else {

1222

1782

af = AF_INET;

1223

1783

}

1224

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

1225

if(ret < 0){

1226

exitcode = EXIT_FAILURE;

1227

} else {

1784

1785

if(quit_now){

1786

goto end;

1787

}

1788

1789

while(not quit_now){

1790

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

1791

if(quit_now or ret == 0){

1792

break;

1793

}

1794

sleep((int)retry_interval or 1);

1795

};

1796

1797

if (not quit_now){

1228

1798

exitcode = EXIT_SUCCESS;

1229

1799

}

1230

goto end;

1231

}

1232

1800

1801

goto end;

1802

}

1803

1804

if(quit_now){

1805

goto end;

1806

}

1807

1233

1808

{

1234

1809

AvahiServerConfig config;

1235

1810

/* Do not publish any local Zeroconf records */

1252

1827

if(mc.server == NULL){

1253

1828

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

1254

1829

avahi_strerror(error));

1255

exitcode = EXIT_FAILURE;

1830

exitcode = EX_UNAVAILABLE;

1831

goto end;

1832

}

1833

1834

if(quit_now){

1256

1835

goto end;

1257

1836

}

1258

1837

1263

1842

if(sb == NULL){

1264

1843

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

1265

1844

avahi_strerror(avahi_server_errno(mc.server)));

1266

exitcode = EXIT_FAILURE;

1845

exitcode = EX_UNAVAILABLE;

1846

goto end;

1847

}

1848

1849

if(quit_now){

1267

1850

goto end;

1268

1851

}

1269

1852

1272

1855

if(debug){

1273

1856

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

1274

1857

}

1275

1276

avahi_simple_poll_loop(mc.simple_poll);

1858

1859

ret = avahi_loop_with_timeout(mc.simple_poll,

1860

(int)(retry_interval * 1000));

1861

if(debug){

1862

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

1863

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

1864

}

1277

1865

1278

1866

end:

1279

1867

1300

1888

if(gpgme_initialized){

1301

1889

gpgme_release(mc.ctx);

1302

1890

}

1891

1892

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

1893

has seen */

1894

if(mc.current_server != NULL){

1895

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

1896

while(mc.current_server != NULL){

1897

server *next = mc.current_server->next;

1898

free(mc.current_server);

1899

mc.current_server = next;

1900

}

1901

}

1303

1902

1304

1903

/* Take down the network interface */

1305

if(interface_taken_up){

1306

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

1904

if(take_down_interface){

1905

/* Re-raise priviliges */

1906

errno = 0;

1907

ret = seteuid(0);

1307

1908

if(ret == -1){

1308

perror("ioctl SIOCGIFFLAGS");

1309

} else if(network.ifr_flags & IFF_UP) {

1310

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

1311

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

1312

if(ret == -1){

1313

perror("ioctl SIOCSIFFLAGS");

1314

}

1909

perror_plus("seteuid");

1315

1910

}

1316

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

1317

if(ret == -1){

1318

perror("close");

1911

if(geteuid() == 0){

1912

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

1913

if(ret == -1){

1914

perror_plus("ioctl SIOCGIFFLAGS");

1915

} else if(network.ifr_flags & IFF_UP) {

1916

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

1917

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

1918

if(ret == -1){

1919

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1920

}

1921

}

1922

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

1923

if(ret == -1){

1924

perror_plus("close");

1925

}

1926

/* Lower privileges permanently */

1927

errno = 0;

1928

ret = setuid(uid);

1929

if(ret == -1){

1930

perror_plus("setuid");

1931

}

1319

1932

}

1320

1933

}

1321

1934

1322

/* Removes the temp directory used by GPGME */

1935

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

1323

1936

if(tempdir_created){

1324

DIR *d;

1325

struct dirent *direntry;

1326

d = opendir(tempdir);

1327

if(d == NULL){

1328

if(errno != ENOENT){

1329

perror("opendir");

1330

}

1331

} else {

1332

while(true){

1333

direntry = readdir(d);

1334

if(direntry == NULL){

1335

break;

1336

}

1337

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

1338

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

1339

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

1340

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

1341

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

1342

continue;

1343

}

1937

struct dirent **direntries = NULL;

1938

struct dirent *direntry = NULL;

1939

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

1940

if (ret > 0){

1941

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

1942

direntry = direntries[i];

1344

1943

char *fullname = NULL;

1345

1944

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

1346

1945

direntry->d_name);

1347

1946

if(ret < 0){

1348

perror("asprintf");

1947

perror_plus("asprintf");

1349

1948

continue;

1350

1949

}

1351

1950

ret = remove(fullname);

1355

1954

}

1356

1955

free(fullname);

1357

1956

}

1358

closedir(d);

1957

}

1958

1959

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

1960

specify */

1961

free(direntries);

1962

if (ret == -1){

1963

perror_plus("scandir");

1359

1964

}

1360

1965

ret = rmdir(tempdir);

1361

1966

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

1362

perror("rmdir");

1363

}

1967

perror_plus("rmdir");

1968

}

1969

}

1970

1971

if(quit_now){

1972

sigemptyset(&old_sigterm_action.sa_mask);

1973

old_sigterm_action.sa_handler = SIG_DFL;

1974

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1975

&old_sigterm_action,

1976

NULL));

1977

if(ret == -1){

1978

perror_plus("sigaction");

1979

}

1980

do {

1981

ret = raise(signal_received);

1982

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

1983

if(ret != 0){

1984

perror_plus("raise");

1985

abort();

1986

}

1987

TEMP_FAILURE_RETRY(pause());

1364

1988

}

1365

1989

1366

1990

return exitcode;