/mandos/release : revision 237.2.99

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, program_invocation_short_name */

66

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

65

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

66

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

67

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

68

SIOCSIFFLAGS, if_indextoname(),

69

if_nametoindex(), IF_NAMESIZE */

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

73

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

74

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

75

setgid(), pause() */

74

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

75

setgid() */

76

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

77

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

78

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

80

argp_parse(), ARGP_KEY_ARG,

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

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

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

87

85

88

86

#ifdef __linux__

89

87

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

127

125

static const char mandos_protocol_version[] = "1";

128

126

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

129

127

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

130

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

131

char *connect_to = NULL;

132

133

/* Doubly linked list that need to be circular linked when ever used */

134

typedef struct server{

135

const char *ip;

136

uint16_t port;

137

AvahiIfIndex if_index;

138

int af;

139

struct timespec last_seen;

140

struct server *next;

141

struct server *prev;

142

} server;

143

128

144

129

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

145

130

typedef struct {

150

135

gnutls_dh_params_t dh_params;

151

136

const char *priority;

152

137

gpgme_ctx_t ctx;

153

server *current_server;

154

138

} mandos_context;

155

139

156

140

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

157

141

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

158

142

.dh_bits = 1024, .priority = "SECURE256"

159

":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };

160

161

sig_atomic_t quit_now = 0;

162

int signal_received = 0;

163

164

/* Function to use when printing errors */

165

void perror_plus(const char *print_text){

166

fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);

167

perror(print_text);

168

}

143

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

169

144

170

145

/*

171

146

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

184

159

return buffer_capacity;

185

160

}

186

161

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

190

int ret;

191

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

192

if(new_server == NULL){

193

perror_plus("malloc");

194

return -1;

195

}

196

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

197

.port = port,

198

.if_index = if_index,

199

.af = af };

200

if(new_server->ip == NULL){

201

perror_plus("strdup");

202

return -1;

203

}

204

/* uniqe case of first server */

205

if (mc.current_server == NULL){

206

new_server->next = new_server;

207

new_server->prev = new_server;

208

mc.current_server = new_server;

209

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

210

} else {

211

new_server->next = mc.current_server;

212

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

213

new_server->prev->next = new_server;

214

mc.current_server->prev = new_server;

215

}

216

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

217

if(ret == -1){

218

perror_plus("clock_gettime");

219

return -1;

220

}

221

return 0;

222

}

223

224

162

/*

225

163

* Initialize GPGME.

226

164

*/

227

165

static bool init_gpgme(const char *seckey,

228

166

const char *pubkey, const char *tempdir){

167

int ret;

229

168

gpgme_error_t rc;

230

169

gpgme_engine_info_t engine_info;

231

170

234

173

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

235

174

*/

236

175

bool import_key(const char *filename){

237

int ret;

238

176

int fd;

239

177

gpgme_data_t pgp_data;

240

178

241

179

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

242

180

if(fd == -1){

243

perror_plus("open");

181

perror("open");

244

182

return false;

245

183

}

246

184

260

198

261

199

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

262

200

if(ret == -1){

263

perror_plus("close");

201

perror("close");

264

202

}

265

203

gpgme_data_release(pgp_data);

266

204

return true;

311

249

return false;

312

250

}

313

251

314

return true;

252

return true;

315

253

}

316

254

317

255

/*

371

309

}

372

310

gpgme_recipient_t recipient;

373

311

recipient = result->recipients;

374

while(recipient != NULL){

375

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

376

gpgme_pubkey_algo_name(recipient->pubkey_algo));

377

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

378

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

379

recipient->status == GPG_ERR_NO_SECKEY

380

? "No" : "Yes");

381

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

}

382

322

}

383

323

}

384

324

}

391

331

392

332

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

393

333

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

394

perror_plus("gpgme_data_seek");

334

perror("gpgme_data_seek");

395

335

plaintext_length = -1;

396

336

goto decrypt_end;

397

337

}

402

342

(size_t)plaintext_length,

403

343

plaintext_capacity);

404

344

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

345

perror("incbuffer");

406

346

plaintext_length = -1;

407

347

goto decrypt_end;

408

348

}

415

355

break;

416

356

}

417

357

if(ret < 0){

418

perror_plus("gpgme_data_read");

358

perror("gpgme_data_read");

419

359

plaintext_length = -1;

420

360

goto decrypt_end;

421

361

}

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 warnings 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 has been called */

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 = (sizeof(ifreq_flags)*2)+3; /* "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, "Wait until first server is found. No timeout!\n");

1213

}

1214

ret = avahi_simple_poll_iterate(s, -1);

1215

} else {

1216

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1218

}

1219

/* the current time */

1220

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1221

if(ret == -1){

1222

perror_plus("clock_gettime");

1223

return -1;

1224

}

1225

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

1226

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

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1232

if (debug){

1233

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

1234

}

1235

1236

if(block_time <= 0){

1237

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1241

if(ret == 0){

1242

avahi_simple_poll_quit(mc.simple_poll);

1243

return 0;

1244

}

1245

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

1246

if(ret == -1){

1247

perror_plus("clock_gettime");

1248

return -1;

1249

}

1250

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1252

}

1253

1254

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

1255

}

1256

if(ret != 0){

1257

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

1258

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

1259

}

1260

}

1261

}

1262

}

1263

1264

895

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

1265

896

AvahiSServiceBrowser *sb = NULL;

1266

897

int error;

1268

899

intmax_t tmpmax;

1269

900

char *tmp;

1270

901

int exitcode = EXIT_SUCCESS;

1271

const char *interface = "";

902

const char *interface = "eth0";

1272

903

struct ifreq network;

1273

int sd = -1;

1274

bool take_down_interface = false;

904

int sd;

1275

905

uid_t uid;

1276

906

gid_t gid;

907

char *connect_to = NULL;

1277

908

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

1278

909

bool tempdir_created = false;

1279

910

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1283

914

bool gnutls_initialized = false;

1284

915

bool gpgme_initialized = false;

1285

916

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

1287

917

1288

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

struct sigaction old_sigterm_action;

1289

919

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1290

920

1291

uid = getuid();

1292

gid = getgid();

1293

1294

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

1295

errno = 0;

1296

ret = setgid(gid);

1297

if(ret == -1){

1298

perror_plus("setgid");

1299

}

1300

1301

/* Lower user privileges (temporarily) */

1302

errno = 0;

1303

ret = seteuid(uid);

1304

if(ret == -1){

1305

perror_plus("seteuid");

1306

}

1307

1308

if(quit_now){

1309

goto end;

1310

}

1311

1312

921

{

1313

922

struct argp_option options[] = {

1314

923

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

1343

952

.arg = "SECONDS",

1344

953

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

1345

954

.group = 2 },

1346

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

1347

.arg = "SECONDS",

1348

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

1349

.group = 2 },

1350

/*

1351

* These reproduce what we would get without ARGP_NO_HELP

1352

*/

1353

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

1354

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

1355

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

1356

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

1357

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

1358

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

1359

955

{ .name = NULL }

1360

956

};

1361

957

1362

958

error_t parse_opt(int key, char *arg,

1363

959

struct argp_state *state){

1364

errno = 0;

1365

960

switch(key){

1366

961

case 128: /* --debug */

1367

962

debug = true;

1383

978

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

1384

979

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

1385

980

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

1386

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

981

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

982

exit(EXIT_FAILURE);

1387

983

}

1388

984

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

1389

985

break;

1394

990

errno = 0;

1395

991

delay = strtof(arg, &tmp);

1396

992

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

1397

argp_error(state, "Bad delay");

1398

}

1399

case 132: /* --retry */

1400

errno = 0;

1401

retry_interval = strtod(arg, &tmp);

1402

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

1403

or (retry_interval * 1000) > INT_MAX){

1404

argp_error(state, "Bad retry interval");

993

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

994

exit(EXIT_FAILURE);

1405

995

}

1406

996

break;

1407

/*

1408

* These reproduce what we would get without ARGP_NO_HELP

1409

*/

1410

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

1411

argp_state_help(state, state->out_stream,

1412

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1413

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1414

case -3: /* --usage */

1415

argp_state_help(state, state->out_stream,

1416

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1417

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

1418

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

1419

exit(argp_err_exit_status);

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1420

1000

break;

1421

1001

default:

1422

1002

return ARGP_ERR_UNKNOWN;

1423

1003

}

1424

return errno;

1004

return 0;

1425

1005

}

1426

1006

1427

1007

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

1428

1008

.args_doc = "",

1429

1009

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

1430

1010

" passwords from a Mandos server" };

1431

ret = argp_parse(&argp, argc, argv,

1432

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1433

switch(ret){

1434

case 0:

1435

break;

1436

case ENOMEM:

1437

default:

1438

errno = ret;

1439

perror_plus("argp_parse");

1440

exitcode = EX_OSERR;

1441

goto end;

1442

case EINVAL:

1443

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;

1444

1015

goto end;

1445

1016

}

1446

1017

}

1448

1019

if(not debug){

1449

1020

avahi_set_log_function(empty_log);

1450

1021

}

1451

1452

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

1453

struct dirent **direntries;

1454

ret = scandir(sys_class_net, &direntries, good_interface,

1455

alphasort);

1456

if(ret >= 1){

1457

/* Pick the first good interface */

1458

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

1459

if(debug){

1460

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

1461

}

1462

if(interface == NULL){

1463

perror_plus("malloc");

1464

free(direntries);

1465

exitcode = EXIT_FAILURE;

1466

goto end;

1467

}

1468

free(direntries);

1469

} else {

1470

free(direntries);

1471

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

1472

exitcode = EXIT_FAILURE;

1473

goto end;

1474

}

1475

}

1476

1022

1477

1023

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

1478

1024

from the signal handler */

1481

1027

mc.simple_poll = avahi_simple_poll_new();

1482

1028

if(mc.simple_poll == NULL){

1483

1029

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

1484

exitcode = EX_UNAVAILABLE;

1030

exitcode = EXIT_FAILURE;

1485

1031

goto end;

1486

1032

}

1487

1033

1488

1034

sigemptyset(&sigterm_action.sa_mask);

1489

1035

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

1490

1036

if(ret == -1){

1491

perror_plus("sigaddset");

1492

exitcode = EX_OSERR;

1037

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1493

1039

goto end;

1494

1040

}

1495

1041

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

1496

1042

if(ret == -1){

1497

perror_plus("sigaddset");

1498

exitcode = EX_OSERR;

1043

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1499

1045

goto end;

1500

1046

}

1501

1047

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

1502

1048

if(ret == -1){

1503

perror_plus("sigaddset");

1504

exitcode = EX_OSERR;

1505

goto end;

1506

}

1507

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

1508

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

1509

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

1510

*/

1511

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

1512

if(ret == -1){

1513

perror_plus("sigaction");

1514

return EX_OSERR;

1515

}

1516

if(old_sigterm_action.sa_handler != SIG_IGN){

1517

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

1518

if(ret == -1){

1519

perror_plus("sigaction");

1520

exitcode = EX_OSERR;

1521

goto end;

1522

}

1523

}

1524

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

1525

if(ret == -1){

1526

perror_plus("sigaction");

1527

return EX_OSERR;

1528

}

1529

if(old_sigterm_action.sa_handler != SIG_IGN){

1530

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

1531

if(ret == -1){

1532

perror_plus("sigaction");

1533

exitcode = EX_OSERR;

1534

goto end;

1535

}

1536

}

1537

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

1538

if(ret == -1){

1539

perror_plus("sigaction");

1540

return EX_OSERR;

1541

}

1542

if(old_sigterm_action.sa_handler != SIG_IGN){

1543

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

1544

if(ret == -1){

1545

perror_plus("sigaction");

1546

exitcode = EX_OSERR;

1547

goto end;

1548

}

1549

}

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

}

1550

1059

1551

1060

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

1552

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

1553

if_index = (AvahiIfIndex) if_nametoindex(interface);

1554

if(if_index == 0){

1555

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

1556

exitcode = EX_UNAVAILABLE;

1557

goto end;

1558

}

1559

1560

if(quit_now){

1561

goto end;

1562

}

1563

1564

/* Re-raise priviliges */

1565

errno = 0;

1566

ret = seteuid(0);

1567

if(ret == -1){

1568

perror_plus("seteuid");

1569

}

1570

1061

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

1571

1062

#ifdef __linux__

1572

1063

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1573

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

1064

messages to mess up the prompt */

1574

1065

ret = klogctl(8, NULL, 5);

1575

1066

bool restore_loglevel = true;

1576

1067

if(ret == -1){

1577

1068

restore_loglevel = false;

1578

perror_plus("klogctl");

1069

perror("klogctl");

1579

1070

}

1580

1071

#endif /* __linux__ */

1581

1072

1582

1073

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1583

1074

if(sd < 0){

1584

perror_plus("socket");

1585

exitcode = EX_OSERR;

1075

perror("socket");

1076

exitcode = EXIT_FAILURE;

1586

1077

#ifdef __linux__

1587

1078

if(restore_loglevel){

1588

1079

ret = klogctl(7, NULL, 0);

1589

1080

if(ret == -1){

1590

perror_plus("klogctl");

1081

perror("klogctl");

1591

1082

}

1592

1083

}

1593

1084

#endif /* __linux__ */

1594

/* Lower privileges */

1595

errno = 0;

1596

ret = seteuid(uid);

1597

if(ret == -1){

1598

perror_plus("seteuid");

1599

}

1600

1085

goto end;

1601

1086

}

1602

1087

strcpy(network.ifr_name, interface);

1603

1088

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

1604

1089

if(ret == -1){

1605

perror_plus("ioctl SIOCGIFFLAGS");

1090

perror("ioctl SIOCGIFFLAGS");

1606

1091

#ifdef __linux__

1607

1092

if(restore_loglevel){

1608

1093

ret = klogctl(7, NULL, 0);

1609

1094

if(ret == -1){

1610

perror_plus("klogctl");

1095

perror("klogctl");

1611

1096

}

1612

1097

}

1613

1098

#endif /* __linux__ */

1614

exitcode = EX_OSERR;

1615

/* Lower privileges */

1616

errno = 0;

1617

ret = seteuid(uid);

1618

if(ret == -1){

1619

perror_plus("seteuid");

1620

}

1099

exitcode = EXIT_FAILURE;

1621

1100

goto end;

1622

1101

}

1623

1102

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

1624

1103

network.ifr_flags |= IFF_UP;

1625

take_down_interface = true;

1626

1104

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

1627

1105

if(ret == -1){

1628

take_down_interface = false;

1629

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1630

exitcode = EX_OSERR;

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1631

1108

#ifdef __linux__

1632

1109

if(restore_loglevel){

1633

1110

ret = klogctl(7, NULL, 0);

1634

1111

if(ret == -1){

1635

perror_plus("klogctl");

1112

perror("klogctl");

1636

1113

}

1637

1114

}

1638

1115

#endif /* __linux__ */

1639

/* Lower privileges */

1640

errno = 0;

1641

ret = seteuid(uid);

1642

if(ret == -1){

1643

perror_plus("seteuid");

1644

}

1645

1116

goto end;

1646

1117

}

1647

1118

}

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1119

/* sleep checking until interface is running */

1649

1120

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

1650

1121

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

1651

1122

if(ret == -1){

1652

perror_plus("ioctl SIOCGIFFLAGS");

1123

perror("ioctl SIOCGIFFLAGS");

1653

1124

} else if(network.ifr_flags & IFF_RUNNING){

1654

1125

break;

1655

1126

}

1656

1127

struct timespec sleeptime = { .tv_nsec = 250000000 };

1657

1128

ret = nanosleep(&sleeptime, NULL);

1658

1129

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

1659

perror_plus("nanosleep");

1130

perror("nanosleep");

1660

1131

}

1661

1132

}

1662

if(not take_down_interface){

1663

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

1664

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

1665

if(ret == -1){

1666

perror_plus("close");

1667

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1668

1136

}

1669

1137

#ifdef __linux__

1670

1138

if(restore_loglevel){

1671

1139

/* Restores kernel loglevel to default */

1672

1140

ret = klogctl(7, NULL, 0);

1673

1141

if(ret == -1){

1674

perror_plus("klogctl");

1142

perror("klogctl");

1675

1143

}

1676

1144

}

1677

1145

#endif /* __linux__ */

1678

/* Lower privileges */

1679

errno = 0;

1680

if(take_down_interface){

1681

/* Lower privileges */

1682

ret = seteuid(uid);

1683

if(ret == -1){

1684

perror_plus("seteuid");

1685

}

1686

} else {

1687

/* Lower privileges permanently */

1688

ret = setuid(uid);

1689

if(ret == -1){

1690

perror_plus("setuid");

1691

}

1692

}

1693

}

1694

1695

if(quit_now){

1696

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");

1697

1160

}

1698

1161

1699

1162

ret = init_gnutls_global(pubkey, seckey);

1700

1163

if(ret == -1){

1701

1164

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

1702

exitcode = EX_UNAVAILABLE;

1165

exitcode = EXIT_FAILURE;

1703

1166

goto end;

1704

1167

} else {

1705

1168

gnutls_initialized = true;

1706

1169

}

1707

1170

1708

if(quit_now){

1709

goto end;

1710

}

1711

1712

1171

if(mkdtemp(tempdir) == NULL){

1713

perror_plus("mkdtemp");

1172

perror("mkdtemp");

1714

1173

goto end;

1715

1174

}

1716

1175

tempdir_created = true;

1717

1176

1718

if(quit_now){

1719

goto end;

1720

}

1721

1722

1177

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

1723

1178

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

1724

exitcode = EX_UNAVAILABLE;

1179

exitcode = EXIT_FAILURE;

1725

1180

goto end;

1726

1181

} else {

1727

1182

gpgme_initialized = true;

1728

1183

}

1729

1184

1730

if(quit_now){

1731

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

}

1732

1192

}

1733

1193

1734

1194

if(connect_to != NULL){

1737

1197

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

1738

1198

if(address == NULL){

1739

1199

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

1740

exitcode = EX_USAGE;

1741

goto end;

1742

}

1743

1744

if(quit_now){

1745

goto end;

1746

}

1747

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1748

1203

uint16_t port;

1749

1204

errno = 0;

1750

1205

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

1751

1206

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

1752

1207

or tmpmax != (uint16_t)tmpmax){

1753

1208

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

1754

exitcode = EX_USAGE;

1755

goto end;

1756

}

1757

1758

if(quit_now){

1759

goto end;

1760

}

1761

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1762

1212

port = (uint16_t)tmpmax;

1763

1213

*address = '\0';

1764

1214

address = connect_to;

1769

1219

} else {

1770

1220

af = AF_INET;

1771

1221

}

1772

1773

if(quit_now){

1774

goto end;

1775

}

1776

1777

while(not quit_now){

1778

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

1779

if(quit_now or ret == 0){

1780

break;

1781

}

1782

sleep((int)retry_interval or 1);

1783

};

1784

1785

if (not quit_now){

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

1786

1226

exitcode = EXIT_SUCCESS;

1787

1227

}

1788

1789

goto end;

1790

}

1791

1792

if(quit_now){

1793

goto end;

1794

}

1795

1228

goto end;

1229

}

1230

1796

1231

{

1797

1232

AvahiServerConfig config;

1798

1233

/* Do not publish any local Zeroconf records */

1815

1250

if(mc.server == NULL){

1816

1251

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

1817

1252

avahi_strerror(error));

1818

exitcode = EX_UNAVAILABLE;

1819

goto end;

1820

}

1821

1822

if(quit_now){

1253

exitcode = EXIT_FAILURE;

1823

1254

goto end;

1824

1255

}

1825

1256

1830

1261

if(sb == NULL){

1831

1262

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

1832

1263

avahi_strerror(avahi_server_errno(mc.server)));

1833

exitcode = EX_UNAVAILABLE;

1834

goto end;

1835

}

1836

1837

if(quit_now){

1264

exitcode = EXIT_FAILURE;

1838

1265

goto end;

1839

1266

}

1840

1267

1843

1270

if(debug){

1844

1271

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

1845

1272

}

1846

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

1848

if(debug){

1849

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

1850

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

1851

}

1273

1274

avahi_simple_poll_loop(mc.simple_poll);

1852

1275

1853

1276

end:

1854

1277

1875

1298

if(gpgme_initialized){

1876

1299

gpgme_release(mc.ctx);

1877

1300

}

1878

1879

/* cleans up the circular linked list of mandos servers the client has seen */

1880

if(mc.current_server != NULL){

1881

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

1882

while(mc.current_server != NULL){

1883

server *next = mc.current_server->next;

1884

free(mc.current_server);

1885

mc.current_server = next;

1886

}

1887

}

1888

1889

/* Take down the network interface */

1890

if(take_down_interface){

1891

/* Re-raise priviliges */

1892

errno = 0;

1893

ret = seteuid(0);

1894

if(ret == -1){

1895

perror_plus("seteuid");

1896

}

1897

if(geteuid() == 0){

1898

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

1899

if(ret == -1){

1900

perror_plus("ioctl SIOCGIFFLAGS");

1901

} else if(network.ifr_flags & IFF_UP) {

1902

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

1903

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

1904

if(ret == -1){

1905

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1906

}

1907

}

1908

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

1909

if(ret == -1){

1910

perror_plus("close");

1911

}

1912

/* Lower privileges permanently */

1913

errno = 0;

1914

ret = setuid(uid);

1915

if(ret == -1){

1916

perror_plus("setuid");

1917

}

1918

}

1919

}

1920

1921

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

1301

1302

/* Removes the temp directory used by GPGME */

1922

1303

if(tempdir_created){

1923

struct dirent **direntries = NULL;

1924

struct dirent *direntry = NULL;

1925

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

1926

if (ret > 0){

1927

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

1928

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

}

1929

1324

char *fullname = NULL;

1930

1325

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

1931

1326

direntry->d_name);

1932

1327

if(ret < 0){

1933

perror_plus("asprintf");

1328

perror("asprintf");

1934

1329

continue;

1935

1330

}

1936

1331

ret = remove(fullname);

1940

1335

}

1941

1336

free(fullname);

1942

1337

}

1943

}

1944

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

1946

free(direntries);

1947

if (ret == -1){

1948

perror_plus("scandir");

1338

closedir(d);

1949

1339

}

1950

1340

ret = rmdir(tempdir);

1951

1341

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

1952

perror_plus("rmdir");

1953

}

1954

}

1955

1956

if(quit_now){

1957

sigemptyset(&old_sigterm_action.sa_mask);

1958

old_sigterm_action.sa_handler = SIG_DFL;

1959

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1960

&old_sigterm_action,

1961

NULL));

1962

if(ret == -1){

1963

perror_plus("sigaction");

1964

}

1965

do {

1966

ret = raise(signal_received);

1967

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

1968

if(ret != 0){

1969

perror_plus("raise");

1970

abort();

1971

}

1972

TEMP_FAILURE_RETRY(pause());

1342

perror("rmdir");

1343

}

1973

1344

}

1974

1345

1975

1346

return exitcode;