/mandos/trunk : revision 330

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,

81

80

argp_parse(), ARGP_KEY_ARG,

82

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

83

82

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

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 */

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

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

/*

374

309

}

375

310

gpgme_recipient_t recipient;

376

311

recipient = result->recipients;

377

while(recipient != NULL){

378

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

379

gpgme_pubkey_algo_name(recipient->pubkey_algo));

380

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

381

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

382

recipient->status == GPG_ERR_NO_SECKEY

383

? "No" : "Yes");

384

recipient = recipient->next;

312

if(recipient){

313

while(recipient != NULL){

314

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

315

gpgme_pubkey_algo_name(recipient->pubkey_algo));

316

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

317

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

318

recipient->status == GPG_ERR_NO_SECKEY

319

? "No" : "Yes");

320

recipient = recipient->next;

321

}

385

322

}

386

323

}

387

324

}

394

331

395

332

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

396

333

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

397

perror_plus("gpgme_data_seek");

334

perror("gpgme_data_seek");

398

335

plaintext_length = -1;

399

336

goto decrypt_end;

400

337

}

405

342

(size_t)plaintext_length,

406

343

plaintext_capacity);

407

344

if(plaintext_capacity == 0){

408

perror_plus("incbuffer");

345

perror("incbuffer");

409

346

plaintext_length = -1;

410

347

goto decrypt_end;

411

348

}

418

355

break;

419

356

}

420

357

if(ret < 0){

421

perror_plus("gpgme_data_read");

358

perror("gpgme_data_read");

422

359

plaintext_length = -1;

423

360

goto decrypt_end;

424

361

}

481

418

}

482

419

483

420

/* OpenPGP credentials */

484

ret = gnutls_certificate_allocate_credentials(&mc.cred);

421

gnutls_certificate_allocate_credentials(&mc.cred);

485

422

if(ret != GNUTLS_E_SUCCESS){

486

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

423

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

424

from

425

-Wunreachable-code

426

*/

487

427

safer_gnutls_strerror(ret));

488

428

gnutls_global_deinit();

489

429

return -1;

536

476

static int init_gnutls_session(gnutls_session_t *session){

537

477

int ret;

538

478

/* 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);

479

ret = gnutls_init(session, GNUTLS_SERVER);

545

480

if(ret != GNUTLS_E_SUCCESS){

546

481

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

547

482

safer_gnutls_strerror(ret));

549

484

550

485

{

551

486

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);

487

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

559

488

if(ret != GNUTLS_E_SUCCESS){

560

489

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

561

490

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

565

494

}

566

495

}

567

496

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

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

576

499

if(ret != GNUTLS_E_SUCCESS){

577

500

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

578

501

safer_gnutls_strerror(ret));

581

504

}

582

505

583

506

/* ignore client certificate if any. */

584

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

585

509

586

510

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

587

511

596

520

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

597

521

AvahiIfIndex if_index,

598

522

int af){

599

int ret, tcp_sd = -1;

523

int ret, tcp_sd;

600

524

ssize_t sret;

601

525

union {

602

526

struct sockaddr_in in;

603

527

struct sockaddr_in6 in6;

604

528

} to;

605

529

char *buffer = NULL;

606

char *decrypted_buffer = NULL;

530

char *decrypted_buffer;

607

531

size_t buffer_length = 0;

608

532

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

609

534

size_t written;

610

int retval = -1;

535

int retval = 0;

611

536

gnutls_session_t session;

612

537

int pf; /* Protocol family */

613

538

614

errno = 0;

615

616

if(quit_now){

617

errno = EINTR;

618

return -1;

619

}

620

621

539

switch(af){

622

540

case AF_INET6:

623

541

pf = PF_INET6;

627

545

break;

628

546

default:

629

547

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

630

errno = EINVAL;

631

548

return -1;

632

549

}

633

550

643

560

644

561

tcp_sd = socket(pf, SOCK_STREAM, 0);

645

562

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;

563

perror("socket");

564

return -1;

655

565

}

656

566

657

567

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

663

573

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

664

574

}

665

575

if(ret < 0 ){

666

int e = errno;

667

perror_plus("inet_pton");

668

errno = e;

669

goto mandos_end;

576

perror("inet_pton");

577

return -1;

670

578

}

671

579

if(ret == 0){

672

int e = errno;

673

580

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

674

errno = e;

675

goto mandos_end;

581

return -1;

676

582

}

677

583

if(af == AF_INET6){

678

584

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

685

591

if(if_index == AVAHI_IF_UNSPEC){

686

592

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

687

593

" without a network interface\n");

688

errno = EINVAL;

689

goto mandos_end;

594

return -1;

690

595

}

691

596

/* Set the network interface number as scope */

692

597

to.in6.sin6_scope_id = (uint32_t)if_index;

697

602

-Wunreachable-code */

698

603

}

699

604

700

if(quit_now){

701

errno = EINTR;

702

goto mandos_end;

703

}

704

705

605

if(debug){

706

606

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

707

607

char interface[IF_NAMESIZE];

708

608

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

709

perror_plus("if_indextoname");

609

perror("if_indextoname");

710

610

} else {

711

611

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

712

612

ip, interface, port);

726

626

sizeof(addrstr));

727

627

}

728

628

if(pcret == NULL){

729

perror_plus("inet_ntop");

629

perror("inet_ntop");

730

630

} else {

731

631

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

732

632

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

734

634

}

735

635

}

736

636

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

742

637

if(af == AF_INET6){

743

638

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

744

639

} else {

745

640

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

746

641

}

747

642

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;

643

perror("connect");

644

return -1;

759

645

}

760

646

761

647

const char *out = mandos_protocol_version;

765

651

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

766

652

out_size - written));

767

653

if(ret == -1){

768

int e = errno;

769

perror_plus("write");

770

errno = e;

654

perror("write");

655

retval = -1;

771

656

goto mandos_end;

772

657

}

773

658

written += (size_t)ret;

781

666

break;

782

667

}

783

668

}

784

785

if(quit_now){

786

errno = EINTR;

787

goto mandos_end;

788

}

789

669

}

790

670

791

671

if(debug){

792

672

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

793

673

}

794

674

795

if(quit_now){

796

errno = EINTR;

797

goto mandos_end;

798

}

799

800

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

801

675

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

676

803

if(quit_now){

804

errno = EINTR;

805

goto mandos_end;

806

}

807

808

do {

677

do{

809

678

ret = gnutls_handshake(session);

810

if(quit_now){

811

errno = EINTR;

812

goto mandos_end;

813

}

814

679

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

815

680

816

681

if(ret != GNUTLS_E_SUCCESS){

818

683

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

819

684

gnutls_perror(ret);

820

685

}

821

errno = EPROTO;

686

retval = -1;

822

687

goto mandos_end;

823

688

}

824

689

830

695

}

831

696

832

697

while(true){

833

834

if(quit_now){

835

errno = EINTR;

836

goto mandos_end;

837

}

838

839

698

buffer_capacity = incbuffer(&buffer, buffer_length,

840

699

buffer_capacity);

841

700

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;

701

perror("incbuffer");

702

retval = -1;

850

703

goto mandos_end;

851

704

}

852

705

861

714

case GNUTLS_E_AGAIN:

862

715

break;

863

716

case GNUTLS_E_REHANDSHAKE:

864

do {

717

do{

865

718

ret = gnutls_handshake(session);

866

867

if(quit_now){

868

errno = EINTR;

869

goto mandos_end;

870

}

871

719

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

872

720

if(ret < 0){

873

721

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

874

722

gnutls_perror(ret);

875

errno = EPROTO;

723

retval = -1;

876

724

goto mandos_end;

877

725

}

878

726

break;

879

727

default:

880

728

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

881

729

" encrypted session with Mandos server\n");

730

retval = -1;

882

731

gnutls_bye(session, GNUTLS_SHUT_RDWR);

883

errno = EIO;

884

732

goto mandos_end;

885

733

}

886

734

} else {

892

740

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

893

741

}

894

742

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);

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

907

744

908

745

if(buffer_length > 0){

909

ssize_t decrypted_buffer_size;

910

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

911

747

buffer_length,

912

748

&decrypted_buffer);

913

749

if(decrypted_buffer_size >= 0){

914

915

750

written = 0;

916

751

while(written < (size_t) decrypted_buffer_size){

917

if(quit_now){

918

errno = EINTR;

919

goto mandos_end;

920

}

921

922

752

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

923

753

(size_t)decrypted_buffer_size - written,

924

754

stdout);

925

755

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

926

int e = errno;

927

756

if(debug){

928

757

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

929

758

strerror(errno));

930

759

}

931

errno = e;

932

goto mandos_end;

760

retval = -1;

761

break;

933

762

}

934

763

written += (size_t)ret;

935

764

}

936

retval = 0;

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

937

768

}

769

} else {

770

retval = -1;

938

771

}

939

772

940

773

/* Shutdown procedure */

941

774

942

775

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

}

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

962

780

}

781

gnutls_deinit(session);

963

782

return retval;

964

783

}

965

784

982

801

/* Called whenever a service has been resolved successfully or

983

802

timed out */

984

803

985

if(quit_now){

986

return;

987

}

988

989

804

switch(event){

990

805

default:

991

806

case AVAHI_RESOLVER_FAILURE:

1007

822

avahi_proto_to_af(proto));

1008

823

if(ret == 0){

1009

824

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1013

825

}

1014

826

}

1015

827

}

1031

843

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

1032

844

is removed from the LAN */

1033

845

1034

if(quit_now){

1035

return;

1036

}

1037

1038

846

switch(event){

1039

847

default:

1040

848

case AVAHI_BROWSER_FAILURE:

1069

877

}

1070

878

}

1071

879

1072

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

1073

static void handle_sigterm(int sig){

880

sig_atomic_t quit_now = 0;

881

882

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

883

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

1074

884

if(quit_now){

1075

885

return;

1076

886

}

1077

887

quit_now = 1;

1078

signal_received = sig;

1079

888

int old_errno = errno;

1080

/* set main loop to exit */

1081

889

if(mc.simple_poll != NULL){

1082

890

avahi_simple_poll_quit(mc.simple_poll);

1083

891

}

1084

892

errno = old_errno;

1085

893

}

1086

894

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

895

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

1275

896

AvahiSServiceBrowser *sb = NULL;

1276

897

int error;

1278

899

intmax_t tmpmax;

1279

900

char *tmp;

1280

901

int exitcode = EXIT_SUCCESS;

1281

const char *interface = "";

902

const char *interface = "eth0";

1282

903

struct ifreq network;

1283

int sd = -1;

1284

bool take_down_interface = false;

904

int sd;

1285

905

uid_t uid;

1286

906

gid_t gid;

907

char *connect_to = NULL;

1287

908

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

1288

909

bool tempdir_created = false;

1289

910

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1293

914

bool gnutls_initialized = false;

1294

915

bool gpgme_initialized = false;

1295

916

float delay = 2.5f;

1296

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

1297

retrying the same server again */

1298

917

1299

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

struct sigaction old_sigterm_action;

1300

919

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1301

920

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

921

{

1324

922

struct argp_option options[] = {

1325

923

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

1354

952

.arg = "SECONDS",

1355

953

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

1356

954

.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

955

{ .name = NULL }

1371

956

};

1372

957

1373

958

error_t parse_opt(int key, char *arg,

1374

959

struct argp_state *state){

1375

errno = 0;

1376

960

switch(key){

1377

961

case 128: /* --debug */

1378

962

debug = true;

1394

978

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

1395

979

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

1396

980

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

1397

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

981

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

982

exit(EXIT_FAILURE);

1398

983

}

1399

984

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

1400

985

break;

1405

990

errno = 0;

1406

991

delay = strtof(arg, &tmp);

1407

992

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");

993

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

994

exit(EXIT_FAILURE);

1416

995

}

1417

996

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);

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1431

1000

break;

1432

1001

default:

1433

1002

return ARGP_ERR_UNKNOWN;

1434

1003

}

1435

return errno;

1004

return 0;

1436

1005

}

1437

1006

1438

1007

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

1439

1008

.args_doc = "",

1440

1009

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

1441

1010

" 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;

1011

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

1012

if(ret == ARGP_ERR_UNKNOWN){

1013

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

1014

exitcode = EXIT_FAILURE;

1455

1015

goto end;

1456

1016

}

1457

1017

}

1459

1019

if(not debug){

1460

1020

avahi_set_log_function(empty_log);

1461

1021

}

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

}

1487

1022

1488

1023

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

1489

1024

from the signal handler */

1492

1027

mc.simple_poll = avahi_simple_poll_new();

1493

1028

if(mc.simple_poll == NULL){

1494

1029

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

1495

exitcode = EX_UNAVAILABLE;

1030

exitcode = EXIT_FAILURE;

1496

1031

goto end;

1497

1032

}

1498

1033

1499

1034

sigemptyset(&sigterm_action.sa_mask);

1500

1035

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

1501

1036

if(ret == -1){

1502

perror_plus("sigaddset");

1503

exitcode = EX_OSERR;

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1504

1039

goto end;

1505

1040

}

1506

1041

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

1507

1042

if(ret == -1){

1508

perror_plus("sigaddset");

1509

exitcode = EX_OSERR;

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1510

1045

goto end;

1511

1046

}

1512

1047

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

1513

1048

if(ret == -1){

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

}

1049

perror("sigaddset");

1050

exitcode = EXIT_FAILURE;

1051

goto end;

1052

}

1053

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

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

1561

1059

1562

1060

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

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

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

1582

1062

#ifdef __linux__

1583

1063

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1584

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

1064

messages to mess up the prompt */

1585

1065

ret = klogctl(8, NULL, 5);

1586

1066

bool restore_loglevel = true;

1587

1067

if(ret == -1){

1588

1068

restore_loglevel = false;

1589

perror_plus("klogctl");

1069

perror("klogctl");

1590

1070

}

1591

1071

#endif /* __linux__ */

1592

1072

1593

1073

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1594

1074

if(sd < 0){

1595

perror_plus("socket");

1596

exitcode = EX_OSERR;

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1597

1077

#ifdef __linux__

1598

1078

if(restore_loglevel){

1599

1079

ret = klogctl(7, NULL, 0);

1600

1080

if(ret == -1){

1601

perror_plus("klogctl");

1081

perror("klogctl");

1602

1082

}

1603

1083

}

1604

1084

#endif /* __linux__ */

1605

/* Lower privileges */

1606

errno = 0;

1607

ret = seteuid(uid);

1608

if(ret == -1){

1609

perror_plus("seteuid");

1610

}

1611

1085

goto end;

1612

1086

}

1613

1087

strcpy(network.ifr_name, interface);

1614

1088

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

1615

1089

if(ret == -1){

1616

perror_plus("ioctl SIOCGIFFLAGS");

1090

perror("ioctl SIOCGIFFLAGS");

1617

1091

#ifdef __linux__

1618

1092

if(restore_loglevel){

1619

1093

ret = klogctl(7, NULL, 0);

1620

1094

if(ret == -1){

1621

perror_plus("klogctl");

1095

perror("klogctl");

1622

1096

}

1623

1097

}

1624

1098

#endif /* __linux__ */

1625

exitcode = EX_OSERR;

1626

/* Lower privileges */

1627

errno = 0;

1628

ret = seteuid(uid);

1629

if(ret == -1){

1630

perror_plus("seteuid");

1631

}

1099

exitcode = EXIT_FAILURE;

1632

1100

goto end;

1633

1101

}

1634

1102

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

1635

1103

network.ifr_flags |= IFF_UP;

1636

take_down_interface = true;

1637

1104

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

1638

1105

if(ret == -1){

1639

take_down_interface = false;

1640

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1641

exitcode = EX_OSERR;

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1642

1108

#ifdef __linux__

1643

1109

if(restore_loglevel){

1644

1110

ret = klogctl(7, NULL, 0);

1645

1111

if(ret == -1){

1646

perror_plus("klogctl");

1112

perror("klogctl");

1647

1113

}

1648

1114

}

1649

1115

#endif /* __linux__ */

1650

/* Lower privileges */

1651

errno = 0;

1652

ret = seteuid(uid);

1653

if(ret == -1){

1654

perror_plus("seteuid");

1655

}

1656

1116

goto end;

1657

1117

}

1658

1118

}

1659

/* Sleep checking until interface is running.

1660

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

1119

/* sleep checking until interface is running */

1661

1120

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

1662

1121

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

1663

1122

if(ret == -1){

1664

perror_plus("ioctl SIOCGIFFLAGS");

1123

perror("ioctl SIOCGIFFLAGS");

1665

1124

} else if(network.ifr_flags & IFF_RUNNING){

1666

1125

break;

1667

1126

}

1668

1127

struct timespec sleeptime = { .tv_nsec = 250000000 };

1669

1128

ret = nanosleep(&sleeptime, NULL);

1670

1129

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

1671

perror_plus("nanosleep");

1130

perror("nanosleep");

1672

1131

}

1673

1132

}

1674

if(not take_down_interface){

1675

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

1676

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

1677

if(ret == -1){

1678

perror_plus("close");

1679

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1680

1136

}

1681

1137

#ifdef __linux__

1682

1138

if(restore_loglevel){

1683

1139

/* Restores kernel loglevel to default */

1684

1140

ret = klogctl(7, NULL, 0);

1685

1141

if(ret == -1){

1686

perror_plus("klogctl");

1142

perror("klogctl");

1687

1143

}

1688

1144

}

1689

1145

#endif /* __linux__ */

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;

1146

}

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

errno = 0;

1152

setgid(gid);

1153

if(ret == -1){

1154

perror("setgid");

1155

}

1156

1157

ret = setuid(uid);

1158

if(ret == -1){

1159

perror("setuid");

1709

1160

}

1710

1161

1711

1162

ret = init_gnutls_global(pubkey, seckey);

1712

1163

if(ret == -1){

1713

1164

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

1714

exitcode = EX_UNAVAILABLE;

1165

exitcode = EXIT_FAILURE;

1715

1166

goto end;

1716

1167

} else {

1717

1168

gnutls_initialized = true;

1718

1169

}

1719

1170

1720

if(quit_now){

1721

goto end;

1722

}

1723

1724

1171

if(mkdtemp(tempdir) == NULL){

1725

perror_plus("mkdtemp");

1172

perror("mkdtemp");

1726

1173

goto end;

1727

1174

}

1728

1175

tempdir_created = true;

1729

1176

1730

if(quit_now){

1731

goto end;

1732

}

1733

1734

1177

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

1735

1178

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

1736

exitcode = EX_UNAVAILABLE;

1179

exitcode = EXIT_FAILURE;

1737

1180

goto end;

1738

1181

} else {

1739

1182

gpgme_initialized = true;

1740

1183

}

1741

1184

1742

if(quit_now){

1743

goto end;

1185

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

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

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

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

1744

1192

}

1745

1193

1746

1194

if(connect_to != NULL){

1749

1197

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

1750

1198

if(address == NULL){

1751

1199

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

1752

exitcode = EX_USAGE;

1753

goto end;

1754

}

1755

1756

if(quit_now){

1757

goto end;

1758

}

1759

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1760

1203

uint16_t port;

1761

1204

errno = 0;

1762

1205

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

1763

1206

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

1764

1207

or tmpmax != (uint16_t)tmpmax){

1765

1208

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

1766

exitcode = EX_USAGE;

1767

goto end;

1768

}

1769

1770

if(quit_now){

1771

goto end;

1772

}

1773

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1774

1212

port = (uint16_t)tmpmax;

1775

1213

*address = '\0';

1776

1214

address = connect_to;

1781

1219

} else {

1782

1220

af = AF_INET;

1783

1221

}

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){

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

1798

1226

exitcode = EXIT_SUCCESS;

1799

1227

}

1800

1801

goto end;

1802

}

1803

1804

if(quit_now){

1805

goto end;

1806

}

1807

1228

goto end;

1229

}

1230

1808

1231

{

1809

1232

AvahiServerConfig config;

1810

1233

/* Do not publish any local Zeroconf records */

1827

1250

if(mc.server == NULL){

1828

1251

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

1829

1252

avahi_strerror(error));

1830

exitcode = EX_UNAVAILABLE;

1831

goto end;

1832

}

1833

1834

if(quit_now){

1253

exitcode = EXIT_FAILURE;

1835

1254

goto end;

1836

1255

}

1837

1256

1842

1261

if(sb == NULL){

1843

1262

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

1844

1263

avahi_strerror(avahi_server_errno(mc.server)));

1845

exitcode = EX_UNAVAILABLE;

1846

goto end;

1847

}

1848

1849

if(quit_now){

1264

exitcode = EXIT_FAILURE;

1850

1265

goto end;

1851

1266

}

1852

1267

1855

1270

if(debug){

1856

1271

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

1857

1272

}

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

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

1865

1275

1866

1276

end:

1867

1277

1888

1298

if(gpgme_initialized){

1889

1299

gpgme_release(mc.ctx);

1890

1300

}

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

}

1902

1903

/* Take down the network interface */

1904

if(take_down_interface){

1905

/* Re-raise priviliges */

1906

errno = 0;

1907

ret = seteuid(0);

1908

if(ret == -1){

1909

perror_plus("seteuid");

1910

}

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

}

1932

}

1933

}

1934

1935

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

1301

1302

/* Removes the temp directory used by GPGME */

1936

1303

if(tempdir_created){

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];

1304

DIR *d;

1305

struct dirent *direntry;

1306

d = opendir(tempdir);

1307

if(d == NULL){

1308

if(errno != ENOENT){

1309

perror("opendir");

1310

}

1311

} else {

1312

while(true){

1313

direntry = readdir(d);

1314

if(direntry == NULL){

1315

break;

1316

}

1317

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

1318

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

1319

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

1320

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

1321

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

1322

continue;

1323

}

1943

1324

char *fullname = NULL;

1944

1325

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

1945

1326

direntry->d_name);

1946

1327

if(ret < 0){

1947

perror_plus("asprintf");

1328

perror("asprintf");

1948

1329

continue;

1949

1330

}

1950

1331

ret = remove(fullname);

1954

1335

}

1955

1336

free(fullname);

1956

1337

}

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");

1338

closedir(d);

1964

1339

}

1965

1340

ret = rmdir(tempdir);

1966

1341

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

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());

1342

perror("rmdir");

1343

}

1988

1344

}

1989

1345

1990

1346

return exitcode;