/mandos/release : revision 237.16.23

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

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42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

44

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

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() */

55

opendir(), DIR */

56

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

57

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

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inet_pton(), connect(),

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getnameinfo() */

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inet_pton(), connect() */

60

59

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

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60

#include <dirent.h> /* opendir(), struct dirent, readdir()

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61

*/

63

62

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

64

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() */

74

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

75

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

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setgid(), pause(), _exit() */

77

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

77

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

78

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

79

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

80

argp_state, struct argp,

88

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

89

WEXITSTATUS(), WTERMSIG() */

90

#include <grp.h> /* setgroups() */

91

#include <argz.h> /* argz_add_sep(), argz_next(),

92

argz_delete(), argz_append(),

93

argz_stringify(), argz_add(),

94

argz_count() */

95

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

96

EAI_SYSTEM, gai_strerror() */

97

91

98

92

#ifdef __linux__

99

93

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

141

135

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

142

136

char *connect_to = NULL;

143

137

const char *hookdir = HOOKDIR;

144

int hookdir_fd = -1;

145

uid_t uid = 65534;

146

gid_t gid = 65534;

147

138

148

139

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

149

140

typedef struct server{

150

141

const char *ip;

151

in_port_t port;

142

uint16_t port;

152

143

AvahiIfIndex if_index;

153

144

int af;

154

145

struct timespec last_seen;

158

149

159

150

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

160

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

161

153

AvahiServer *server;

162

154

gnutls_certificate_credentials_t cred;

163

155

unsigned int dh_bits;

165

157

const char *priority;

166

158

gpgme_ctx_t ctx;

167

159

server *current_server;

168

char *interfaces;

169

size_t interfaces_size;

170

160

} mandos_context;

171

161

172

/* global so signal handler can reach it*/

173

AvahiSimplePoll *simple_poll;

162

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

163

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

164

.dh_bits = 1024, .priority = "SECURE256"

165

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

166

.current_server = NULL };

174

167

175

168

sig_atomic_t quit_now = 0;

176

169

int signal_received = 0;

177

170

178

171

/* Function to use when printing errors */

179

172

void perror_plus(const char *print_text){

180

int e = errno;

181

173

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

182

174

program_invocation_short_name);

183

errno = e;

184

175

perror(print_text);

185

176

}

186

177

187

__attribute__((format (gnu_printf, 2, 3), nonnull))

188

178

int fprintf_plus(FILE *stream, const char *format, ...){

189

179

va_list ap;

190

180

va_start (ap, format);

191

181

192

182

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

193

183

program_invocation_short_name));

194

return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

184

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

195

185

}

196

186

197

187

/*

199

189

* bytes. "buffer_capacity" is how much is currently allocated,

200

190

* "buffer_length" is how much is already used.

201

191

*/

202

__attribute__((nonnull, warn_unused_result))

203

192

size_t incbuffer(char **buffer, size_t buffer_length,

204

193

size_t buffer_capacity){

205

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

206

char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

207

if(new_buf == NULL){

208

int old_errno = errno;

209

free(*buffer);

210

errno = old_errno;

211

*buffer = NULL;

195

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

196

if(buffer == NULL){

212

197

return 0;

213

198

}

214

*buffer = new_buf;

215

199

buffer_capacity += BUFFER_SIZE;

216

200

}

217

201

return buffer_capacity;

218

202

}

219

203

220

204

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

221

__attribute__((nonnull, warn_unused_result))

222

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

223

int af, server **current_server){

205

int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

206

int af){

224

207

int ret;

225

208

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

226

209

if(new_server == NULL){

227

210

perror_plus("malloc");

228

return false;

211

return -1;

229

212

}

230

213

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

231

214

.port = port,

233

216

.af = af };

234

217

if(new_server->ip == NULL){

235

218

perror_plus("strdup");

236

return false;

237

}

238

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

219

return -1;

242

220

}

243

221

/* Special case of first server */

244

if(*current_server == NULL){

222

if (mc.current_server == NULL){

245

223

new_server->next = new_server;

246

224

new_server->prev = new_server;

247

*current_server = new_server;

225

mc.current_server = new_server;

226

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

248

227

} else {

249

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

250

new_server->next = *current_server;

251

new_server->prev = (*current_server)->prev;

228

new_server->next = mc.current_server;

229

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

252

230

new_server->prev->next = new_server;

253

(*current_server)->prev = new_server;

254

}

255

return true;

231

mc.current_server->prev = new_server;

232

}

233

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

234

if(ret == -1){

235

perror_plus("clock_gettime");

236

return -1;

237

}

238

return 0;

256

239

}

257

240

258

241

/*

259

242

* Initialize GPGME.

260

243

*/

261

__attribute__((nonnull, warn_unused_result))

262

static bool init_gpgme(const char * const seckey,

263

const char * const pubkey,

264

const char * const tempdir,

265

mandos_context *mc){

244

static bool init_gpgme(const char *seckey, const char *pubkey,

245

const char *tempdir){

266

246

gpgme_error_t rc;

267

247

gpgme_engine_info_t engine_info;

268

248

249

269

250

/*

270

251

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

271

252

*/

272

bool import_key(const char * const filename){

253

bool import_key(const char *filename){

273

254

int ret;

274

255

int fd;

275

256

gpgme_data_t pgp_data;

287

268

return false;

288

269

}

289

270

290

rc = gpgme_op_import(mc->ctx, pgp_data);

271

rc = gpgme_op_import(mc.ctx, pgp_data);

291

272

if(rc != GPG_ERR_NO_ERROR){

292

273

fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",

293

274

gpgme_strsource(rc), gpgme_strerror(rc));

337

318

}

338

319

339

320

/* Create new GPGME "context" */

340

rc = gpgme_new(&(mc->ctx));

321

rc = gpgme_new(&(mc.ctx));

341

322

if(rc != GPG_ERR_NO_ERROR){

342

323

fprintf_plus(stderr, "Mandos plugin mandos-client: "

343

324

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

356

337

* Decrypt OpenPGP data.

357

338

* Returns -1 on error

358

339

*/

359

__attribute__((nonnull, warn_unused_result))

360

340

static ssize_t pgp_packet_decrypt(const char *cryptotext,

361

341

size_t crypto_size,

362

char **plaintext,

363

mandos_context *mc){

342

char **plaintext){

364

343

gpgme_data_t dh_crypto, dh_plain;

365

344

gpgme_error_t rc;

366

345

ssize_t ret;

392

371

393

372

/* Decrypt data from the cryptotext data buffer to the plaintext

394

373

data buffer */

395

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

374

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

396

375

if(rc != GPG_ERR_NO_ERROR){

397

376

fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",

398

377

gpgme_strsource(rc), gpgme_strerror(rc));

399

378

plaintext_length = -1;

400

379

if(debug){

401

380

gpgme_decrypt_result_t result;

402

result = gpgme_op_decrypt_result(mc->ctx);

381

result = gpgme_op_decrypt_result(mc.ctx);

403

382

if(result == NULL){

404

383

fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");

405

384

} else {

482

461

return plaintext_length;

483

462

}

484

463

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

487

const char *ret = gnutls_strerror(value);

464

static const char * safer_gnutls_strerror(int value){

465

const char *ret = gnutls_strerror(value); /* Spurious warning from

466

-Wunreachable-code */

488

467

if(ret == NULL)

489

468

ret = "(unknown)";

490

469

return ret;

491

470

}

492

471

493

472

/* GnuTLS log function callback */

494

__attribute__((nonnull))

495

473

static void debuggnutls(__attribute__((unused)) int level,

496

474

const char* string){

497

475

fprintf_plus(stderr, "GnuTLS: %s", string);

498

476

}

499

477

500

__attribute__((nonnull, warn_unused_result))

501

478

static int init_gnutls_global(const char *pubkeyfilename,

502

const char *seckeyfilename,

503

mandos_context *mc){

479

const char *seckeyfilename){

504

480

int ret;

505

481

506

482

if(debug){

523

499

}

524

500

525

501

/* OpenPGP credentials */

526

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

527

503

if(ret != GNUTLS_E_SUCCESS){

528

504

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

529

505

safer_gnutls_strerror(ret));

539

515

}

540

516

541

517

ret = gnutls_certificate_set_openpgp_key_file

542

(mc->cred, pubkeyfilename, seckeyfilename,

518

(mc.cred, pubkeyfilename, seckeyfilename,

543

519

GNUTLS_OPENPGP_FMT_BASE64);

544

520

if(ret != GNUTLS_E_SUCCESS){

545

521

fprintf_plus(stderr,

551

527

}

552

528

553

529

/* GnuTLS server initialization */

554

ret = gnutls_dh_params_init(&mc->dh_params);

530

ret = gnutls_dh_params_init(&mc.dh_params);

555

531

if(ret != GNUTLS_E_SUCCESS){

556

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

557

533

" initialization: %s\n",

558

534

safer_gnutls_strerror(ret));

559

535

goto globalfail;

560

536

}

561

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

537

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

562

538

if(ret != GNUTLS_E_SUCCESS){

563

539

fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",

564

540

safer_gnutls_strerror(ret));

565

541

goto globalfail;

566

542

}

567

543

568

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

569

545

570

546

return 0;

571

547

572

548

globalfail:

573

549

574

gnutls_certificate_free_credentials(mc->cred);

550

gnutls_certificate_free_credentials(mc.cred);

575

551

gnutls_global_deinit();

576

gnutls_dh_params_deinit(mc->dh_params);

552

gnutls_dh_params_deinit(mc.dh_params);

577

553

return -1;

578

554

}

579

555

580

__attribute__((nonnull, warn_unused_result))

581

static int init_gnutls_session(gnutls_session_t *session,

582

mandos_context *mc){

556

static int init_gnutls_session(gnutls_session_t *session){

583

557

int ret;

584

558

/* GnuTLS session creation */

585

559

do {

597

571

{

598

572

const char *err;

599

573

do {

600

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

574

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

601

575

if(quit_now){

602

576

gnutls_deinit(*session);

603

577

return -1;

614

588

615

589

do {

616

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

617

mc->cred);

591

mc.cred);

618

592

if(quit_now){

619

593

gnutls_deinit(*session);

620

594

return -1;

630

604

/* ignore client certificate if any. */

631

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

632

606

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

634

608

635

609

return 0;

636

610

}

640

614

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

641

615

642

616

/* Called when a Mandos server is found */

643

__attribute__((nonnull, warn_unused_result))

644

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

617

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

645

618

AvahiIfIndex if_index,

646

int af, mandos_context *mc){

619

int af){

647

620

int ret, tcp_sd = -1;

648

621

ssize_t sret;

649

struct sockaddr_storage to;

622

union {

623

struct sockaddr_in in;

624

struct sockaddr_in6 in6;

625

} to;

650

626

char *buffer = NULL;

651

627

char *decrypted_buffer = NULL;

652

628

size_t buffer_length = 0;

676

652

return -1;

677

653

}

678

654

679

/* If the interface is specified and we have a list of interfaces */

680

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

681

/* Check if the interface is one of the interfaces we are using */

682

bool match = false;

683

{

684

char *interface = NULL;

685

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

686

interface))){

687

if(if_nametoindex(interface) == (unsigned int)if_index){

688

match = true;

689

break;

690

}

691

}

692

}

693

if(not match){

694

/* This interface does not match any in the list, so we don't

695

connect to the server */

696

if(debug){

697

char interface[IF_NAMESIZE];

698

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

699

perror_plus("if_indextoname");

700

} else {

701

fprintf_plus(stderr, "Skipping server on non-used interface"

702

" \"%s\"\n",

703

if_indextoname((unsigned int)if_index,

704

interface));

705

}

706

}

707

return -1;

708

}

709

}

710

711

ret = init_gnutls_session(&session, mc);

655

ret = init_gnutls_session(&session);

712

656

if(ret != 0){

713

657

return -1;

714

658

}

715

659

716

660

if(debug){

717

661

fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"

718

PRIuMAX "\n", ip, (uintmax_t)port);

662

PRIu16 "\n", ip, port);

719

663

}

720

664

721

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

733

677

734

678

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

735

679

if(af == AF_INET6){

736

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

737

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

680

to.in6.sin6_family = (sa_family_t)af;

681

ret = inet_pton(af, ip, &to.in6.sin6_addr);

738

682

} else { /* IPv4 */

739

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

740

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

683

to.in.sin_family = (sa_family_t)af;

684

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

741

685

}

742

686

if(ret < 0 ){

743

687

int e = errno;

752

696

goto mandos_end;

753

697

}

754

698

if(af == AF_INET6){

755

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

756

if(IN6_IS_ADDR_LINKLOCAL

757

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

699

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

700

-Wconversion and

701

-Wunreachable-code */

702

703

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

704

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

705

-Wunreachable-code*/

758

706

if(if_index == AVAHI_IF_UNSPEC){

759

707

fprintf_plus(stderr, "An IPv6 link-local address is"

760

708

" incomplete without a network interface\n");

762

710

goto mandos_end;

763

711

}

764

712

/* Set the network interface number as scope */

765

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

713

to.in6.sin6_scope_id = (uint32_t)if_index;

766

714

}

767

715

} else {

768

((struct sockaddr_in *)&to)->sin_port = htons(port);

716

to.in.sin_port = htons(port); /* Spurious warnings from

717

-Wconversion and

718

-Wunreachable-code */

769

719

}

770

720

771

721

if(quit_now){

779

729

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

780

730

perror_plus("if_indextoname");

781

731

} else {

782

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

783

"\n", ip, interface, (uintmax_t)port);

732

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

733

"\n", ip, interface, port);

784

734

}

785

735

} else {

786

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

787

ip, (uintmax_t)port);

736

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

737

ip, port);

788

738

}

789

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

790

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

741

const char *pcret;

791

742

if(af == AF_INET6){

792

ret = getnameinfo((struct sockaddr *)&to,

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

743

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

744

sizeof(addrstr));

796

745

} else {

797

ret = getnameinfo((struct sockaddr *)&to,

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

746

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

747

sizeof(addrstr));

801

748

}

802

if(ret == EAI_SYSTEM){

803

perror_plus("getnameinfo");

804

} else if(ret != 0) {

805

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

806

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

807

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

749

if(pcret == NULL){

750

perror_plus("inet_ntop");

751

} else {

752

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

753

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

754

}

808

755

}

809

756

}

810

757

814

761

}

815

762

816

763

if(af == AF_INET6){

817

ret = connect(tcp_sd, (struct sockaddr *)&to,

818

sizeof(struct sockaddr_in6));

764

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

819

765

} else {

820

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

821

sizeof(struct sockaddr_in));

766

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

822

767

}

823

768

if(ret < 0){

824

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

769

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

825

770

int e = errno;

826

771

perror_plus("connect");

827

772

errno = e;

873

818

goto mandos_end;

874

819

}

875

820

876

/* This casting via intptr_t is to eliminate warning about casting

877

an int to a pointer type. This is exactly how the GnuTLS Guile

878

function "set-session-transport-fd!" does it. */

879

gnutls_transport_set_ptr(session,

880

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

821

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

822

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

881

823

882

824

if(quit_now){

883

825

errno = EINTR;

988

930

if(buffer_length > 0){

989

931

ssize_t decrypted_buffer_size;

990

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

991

&decrypted_buffer, mc);

933

&decrypted_buffer);

992

934

if(decrypted_buffer_size >= 0){

993

935

994

936

written = 0;

1042

984

return retval;

1043

985

}

1044

986

1045

__attribute__((nonnull))

1046

987

static void resolve_callback(AvahiSServiceResolver *r,

1047

988

AvahiIfIndex interface,

1048

989

AvahiProtocol proto,

1056

997

AVAHI_GCC_UNUSED AvahiStringList *txt,

1057

998

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1058

999

flags,

1059

void *mc){

1060

if(r == NULL){

1061

return;

1062

}

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1063

1002

1064

1003

/* Called whenever a service has been resolved successfully or

1065

1004

timed out */

1074

1013

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1075

1014

"'%s' of type '%s' in domain '%s': %s\n", name, type,

1076

1015

domain,

1077

avahi_strerror(avahi_server_errno

1078

(((mandos_context*)mc)->server)));

1016

avahi_strerror(avahi_server_errno(mc.server)));

1079

1017

break;

1080

1018

1081

1019

case AVAHI_RESOLVER_FOUND:

1087

1025

PRIdMAX ") on port %" PRIu16 "\n", name,

1088

1026

host_name, ip, (intmax_t)interface, port);

1089

1027

}

1090

int ret = start_mandos_communication(ip, (in_port_t)port,

1091

interface,

1092

avahi_proto_to_af(proto),

1093

mc);

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1094

1030

if(ret == 0){

1095

avahi_simple_poll_quit(simple_poll);

1031

avahi_simple_poll_quit(mc.simple_poll);

1096

1032

} else {

1097

if(not add_server(ip, (in_port_t)port, interface,

1098

avahi_proto_to_af(proto),

1099

&((mandos_context*)mc)->current_server)){

1100

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1101

" list\n", name);

1102

}

1033

ret = add_server(ip, port, interface,

1034

avahi_proto_to_af(proto));

1103

1035

}

1104

1036

}

1105

1037

}

1115

1047

const char *domain,

1116

1048

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1117

1049

flags,

1118

void *mc){

1119

if(b == NULL){

1120

return;

1121

}

1050

AVAHI_GCC_UNUSED void* userdata){

1051

assert(b);

1122

1052

1123

1053

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

1124

1054

is removed from the LAN */

1132

1062

case AVAHI_BROWSER_FAILURE:

1133

1063

1134

1064

fprintf_plus(stderr, "(Avahi browser) %s\n",

1135

avahi_strerror(avahi_server_errno

1136

(((mandos_context*)mc)->server)));

1137

avahi_simple_poll_quit(simple_poll);

1065

avahi_strerror(avahi_server_errno(mc.server)));

1066

avahi_simple_poll_quit(mc.simple_poll);

1138

1067

return;

1139

1068

1140

1069

case AVAHI_BROWSER_NEW:

1143

1072

the callback function is called the Avahi server will free the

1144

1073

resolver for us. */

1145

1074

1146

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1147

interface, protocol, name, type,

1148

domain, protocol, 0,

1149

resolve_callback, mc) == NULL)

1075

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

1076

name, type, domain, protocol, 0,

1077

resolve_callback, NULL) == NULL)

1150

1078

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1151

1079

" %s\n", name,

1152

avahi_strerror(avahi_server_errno

1153

(((mandos_context*)mc)->server)));

1080

avahi_strerror(avahi_server_errno(mc.server)));

1154

1081

break;

1155

1082

1156

1083

case AVAHI_BROWSER_REMOVE:

1175

1102

signal_received = sig;

1176

1103

int old_errno = errno;

1177

1104

/* set main loop to exit */

1178

if(simple_poll != NULL){

1179

avahi_simple_poll_quit(simple_poll);

1105

if(mc.simple_poll != NULL){

1106

avahi_simple_poll_quit(mc.simple_poll);

1180

1107

}

1181

1108

errno = old_errno;

1182

1109

}

1183

1110

1184

__attribute__((nonnull, warn_unused_result))

1185

1111

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

1186

1112

int ret;

1187

error_t ret_errno;

1188

1113

1189

1114

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

1190

1115

if(s < 0){

1191

ret_errno = errno;

1192

1116

perror_plus("socket");

1193

errno = ret_errno;

1194

1117

return false;

1195

1118

}

1196

1119

strcpy(ifr->ifr_name, ifname);

1197

1120

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1198

1121

if(ret == -1){

1199

1122

if(debug){

1200

ret_errno = errno;

1201

1123

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1203

1124

}

1204

1125

return false;

1205

1126

}

1206

1127

return true;

1207

1128

}

1208

1129

1209

__attribute__((nonnull, warn_unused_result))

1210

1130

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

1211

1131

1212

1132

/* Reject the loopback device */

1254

1174

* corresponds to an acceptable network device.

1255

1175

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

1256

1176

*/

1257

__attribute__((nonnull, warn_unused_result))

1258

1177

int good_interface(const struct dirent *if_entry){

1259

1178

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

1260

1179

return 0;

1276

1195

}

1277

1196

1278

1197

/*

1279

* This function determines if a network interface is up.

1280

*/

1281

__attribute__((nonnull, warn_unused_result))

1282

bool interface_is_up(const char *interface){

1283

struct ifreq ifr;

1284

if(not get_flags(interface, &ifr)){

1285

if(debug){

1286

fprintf_plus(stderr, "Failed to get flags for interface "

1287

"\"%s\"\n", interface);

1288

}

1289

return false;

1290

}

1291

1292

return (bool)(ifr.ifr_flags & IFF_UP);

1293

}

1294

1295

/*

1296

* This function determines if a network interface is running

1297

*/

1298

__attribute__((nonnull, warn_unused_result))

1299

bool interface_is_running(const char *interface){

1300

struct ifreq ifr;

1301

if(not get_flags(interface, &ifr)){

1302

if(debug){

1303

fprintf_plus(stderr, "Failed to get flags for interface "

1304

"\"%s\"\n", interface);

1305

}

1306

return false;

1307

}

1308

1309

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1310

}

1311

1312

__attribute__((nonnull, pure, warn_unused_result))

1198

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

1199

* corresponds to an acceptable network device which is up.

1200

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

1201

*/

1202

int up_interface(const struct dirent *if_entry){

1203

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

1204

return 0;

1205

}

1206

1207

struct ifreq ifr;

1208

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

1209

if(debug){

1210

fprintf_plus(stderr, "Failed to get flags for interface "

1211

"\"%s\"\n", if_entry->d_name);

1212

}

1213

return 0;

1214

}

1215

1216

/* Reject down interfaces */

1217

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

1218

if(debug){

1219

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

1220

if_entry->d_name);

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject non-running interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

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

1235

return 0;

1236

}

1237

return 1;

1238

}

1239

1313

1240

int notdotentries(const struct dirent *direntry){

1314

1241

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

1315

1242

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

1322

1249

}

1323

1250

1324

1251

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

1325

__attribute__((nonnull, warn_unused_result))

1326

1252

int runnable_hook(const struct dirent *direntry){

1327

1253

int ret;

1328

1254

size_t sret;

1336

1262

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1337

1263

"abcdefghijklmnopqrstuvwxyz"

1338

1264

"0123456789"

1339

"_.-");

1265

"_-");

1340

1266

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

1341

1267

/* Contains non-allowed characters */

1342

1268

if(debug){

1360

1286

}

1361

1287

return 0;

1362

1288

}

1363

free(fullname);

1364

1289

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

1365

1290

/* Not a regular file */

1366

1291

if(debug){

1384

1309

return 1;

1385

1310

}

1386

1311

1387

__attribute__((nonnull, warn_unused_result))

1388

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1389

mandos_context *mc){

1312

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1390

1313

int ret;

1391

1314

struct timespec now;

1392

1315

struct timespec waited_time;

1393

1316

intmax_t block_time;

1394

1317

1395

1318

while(true){

1396

if(mc->current_server == NULL){

1397

if(debug){

1319

if(mc.current_server == NULL){

1320

if (debug){

1398

1321

fprintf_plus(stderr, "Wait until first server is found."

1399

1322

" No timeout!\n");

1400

1323

}

1401

1324

ret = avahi_simple_poll_iterate(s, -1);

1402

1325

} else {

1403

if(debug){

1326

if (debug){

1404

1327

fprintf_plus(stderr, "Check current_server if we should run"

1405

1328

" it, or wait\n");

1406

1329

}

1413

1336

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

1414

1337

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

1415

1338

waited_time.tv_sec = (now.tv_sec

1416

- mc->current_server->last_seen.tv_sec);

1339

- mc.current_server->last_seen.tv_sec);

1417

1340

waited_time.tv_nsec = (now.tv_nsec

1418

- mc->current_server->last_seen.tv_nsec);

1341

- mc.current_server->last_seen.tv_nsec);

1419

1342

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

1420

1343

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

1421

1344

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

1423

1346

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

1424

1347

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

1425

1348

1426

if(debug){

1349

if (debug){

1427

1350

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1428

1351

block_time);

1429

1352

}

1430

1353

1431

1354

if(block_time <= 0){

1432

ret = start_mandos_communication(mc->current_server->ip,

1433

mc->current_server->port,

1434

mc->current_server->if_index,

1435

mc->current_server->af, mc);

1355

ret = start_mandos_communication(mc.current_server->ip,

1356

mc.current_server->port,

1357

mc.current_server->if_index,

1358

mc.current_server->af);

1436

1359

if(ret == 0){

1437

avahi_simple_poll_quit(s);

1360

avahi_simple_poll_quit(mc.simple_poll);

1438

1361

return 0;

1439

1362

}

1440

1363

ret = clock_gettime(CLOCK_MONOTONIC,

1441

&mc->current_server->last_seen);

1364

&mc.current_server->last_seen);

1442

1365

if(ret == -1){

1443

1366

perror_plus("clock_gettime");

1444

1367

return -1;

1445

1368

}

1446

mc->current_server = mc->current_server->next;

1369

mc.current_server = mc.current_server->next;

1447

1370

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

1448

1371

servers, but don't block */

1449

1372

}

1451

1374

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

1452

1375

}

1453

1376

if(ret != 0){

1454

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

1377

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

1455

1378

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

1456

1379

}

1457

1380

}

1458

1381

}

1459

1382

}

1460

1383

1461

/* Set effective uid to 0, return errno */

1462

__attribute__((warn_unused_result))

1463

error_t raise_privileges(void){

1464

error_t old_errno = errno;

1465

error_t ret_errno = 0;

1466

if(seteuid(0) == -1){

1467

ret_errno = errno;

1468

perror_plus("seteuid");

1469

}

1470

errno = old_errno;

1471

return ret_errno;

1472

}

1473

1474

/* Set effective and real user ID to 0. Return errno. */

1475

__attribute__((warn_unused_result))

1476

error_t raise_privileges_permanently(void){

1477

error_t old_errno = errno;

1478

error_t ret_errno = raise_privileges();

1479

if(ret_errno != 0){

1480

errno = old_errno;

1481

return ret_errno;

1482

}

1483

if(setuid(0) == -1){

1484

ret_errno = errno;

1485

perror_plus("seteuid");

1486

}

1487

errno = old_errno;

1488

return ret_errno;

1489

}

1490

1491

/* Set effective user ID to unprivileged saved user ID */

1492

__attribute__((warn_unused_result))

1493

error_t lower_privileges(void){

1494

error_t old_errno = errno;

1495

error_t ret_errno = 0;

1496

if(seteuid(uid) == -1){

1497

ret_errno = errno;

1498

perror_plus("seteuid");

1499

}

1500

errno = old_errno;

1501

return ret_errno;

1502

}

1503

1504

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1506

error_t lower_privileges_permanently(void){

1507

error_t old_errno = errno;

1508

error_t ret_errno = 0;

1509

if(setuid(uid) == -1){

1510

ret_errno = errno;

1511

perror_plus("setuid");

1512

}

1513

errno = old_errno;

1514

return ret_errno;

1515

}

1516

1517

#ifndef O_CLOEXEC

1518

/*

1519

* Based on the example in the GNU LibC manual chapter 13.13 "File

1520

* Descriptor Flags".

1521

| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

1522

*/

1523

__attribute__((warn_unused_result))

1524

static int set_cloexec_flag(int fd){

1525

int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));

1526

/* If reading the flags failed, return error indication now. */

1527

if(ret < 0){

1528

return ret;

1529

}

1530

/* Store modified flag word in the descriptor. */

1531

return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

1532

ret | FD_CLOEXEC));

1533

}

1534

#endif /* not O_CLOEXEC */

1535

1536

__attribute__((nonnull))

1537

void run_network_hooks(const char *mode, const char *interface,

1384

bool run_network_hooks(const char *mode, const char *interface,

1538

1385

const float delay){

1539

1386

struct dirent **direntries;

1540

if(hookdir_fd == -1){

1541

hookdir_fd = open(hookdir, O_RDONLY |

1542

#ifdef O_CLOEXEC

1543

O_CLOEXEC

1544

#else /* not O_CLOEXEC */

1545

0

1546

#endif /* not O_CLOEXEC */

1547

);

1548

if(hookdir_fd == -1){

1549

if(errno == ENOENT){

1550

if(debug){

1551

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1552

" found\n", hookdir);

1553

}

1554

} else {

1555

perror_plus("open");

1556

}

1557

return;

1558

}

1559

#ifndef O_CLOEXEC

1560

if(set_cloexec_flag(hookdir_fd) < 0){

1561

perror_plus("set_cloexec_flag");

1562

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1563

perror_plus("close");

1564

} else {

1565

hookdir_fd = -1;

1566

}

1567

return;

1568

}

1569

#endif /* not O_CLOEXEC */

1570

}

1571

#ifdef __GLIBC__

1572

#if __GLIBC_PREREQ(2, 15)

1573

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1574

runnable_hook, alphasort);

1575

#else /* not __GLIBC_PREREQ(2, 15) */

1576

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

1577

alphasort);

1578

#endif /* not __GLIBC_PREREQ(2, 15) */

1579

#else /* not __GLIBC__ */

1580

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

1581

alphasort);

1582

#endif /* not __GLIBC__ */

1387

struct dirent *direntry;

1388

int ret;

1389

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

1390

alphasort);

1583

1391

if(numhooks == -1){

1584

1392

perror_plus("scandir");

1585

return;

1586

}

1587

struct dirent *direntry;

1588

int ret;

1589

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

1590

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

1591

direntry = direntries[i];

1592

char *fullname = NULL;

1593

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1594

if(ret < 0){

1595

perror_plus("asprintf");

1596

continue;

1597

}

1598

if(debug){

1599

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1600

direntry->d_name);

1601

}

1602

pid_t hook_pid = fork();

1603

if(hook_pid == 0){

1604

/* Child */

1605

/* Raise privileges */

1606

if(raise_privileges_permanently() != 0){

1607

perror_plus("Failed to raise privileges");

1608

_exit(EX_NOPERM);

1609

}

1610

/* Set group */

1611

errno = 0;

1612

ret = setgid(0);

1613

if(ret == -1){

1614

perror_plus("setgid");

1615

_exit(EX_NOPERM);

1616

}

1617

/* Reset supplementary groups */

1618

errno = 0;

1619

ret = setgroups(0, NULL);

1620

if(ret == -1){

1621

perror_plus("setgroups");

1622

_exit(EX_NOPERM);

1623

}

1624

ret = dup2(devnull, STDIN_FILENO);

1625

if(ret == -1){

1626

perror_plus("dup2(devnull, STDIN_FILENO)");

1627

_exit(EX_OSERR);

1628

}

1629

ret = close(devnull);

1630

if(ret == -1){

1631

perror_plus("close");

1632

_exit(EX_OSERR);

1633

}

1634

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1635

if(ret == -1){

1636

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1637

_exit(EX_OSERR);

1638

}

1639

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1640

if(ret == -1){

1641

perror_plus("setenv");

1642

_exit(EX_OSERR);

1643

}

1644

ret = setenv("DEVICE", interface, 1);

1645

if(ret == -1){

1646

perror_plus("setenv");

1647

_exit(EX_OSERR);

1648

}

1649

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1650

if(ret == -1){

1651

perror_plus("setenv");

1652

_exit(EX_OSERR);

1653

}

1654

ret = setenv("MODE", mode, 1);

1655

if(ret == -1){

1656

perror_plus("setenv");

1657

_exit(EX_OSERR);

1658

}

1659

char *delaystring;

1660

ret = asprintf(&delaystring, "%f", (double)delay);

1661

if(ret == -1){

1393

} else {

1394

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

1395

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

1396

direntry = direntries[i];

1397

char *fullname = NULL;

1398

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1399

if(ret < 0){

1662

1400

perror_plus("asprintf");

1663

_exit(EX_OSERR);

1664

}

1665

ret = setenv("DELAY", delaystring, 1);

1666

if(ret == -1){

1401

continue;

1402

}

1403

if(debug){

1404

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1405

direntry->d_name);

1406

}

1407

pid_t hook_pid = fork();

1408

if(hook_pid == 0){

1409

/* Child */

1410

/* Raise privileges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror_plus("seteuid");

1415

}

1416

/* Raise privileges even more */

1417

errno = 0;

1418

ret = setuid(0);

1419

if(ret == -1){

1420

perror_plus("setuid");

1421

}

1422

/* Set group */

1423

errno = 0;

1424

ret = setgid(0);

1425

if(ret == -1){

1426

perror_plus("setgid");

1427

}

1428

/* Reset supplementary groups */

1429

errno = 0;

1430

ret = setgroups(0, NULL);

1431

if(ret == -1){

1432

perror_plus("setgroups");

1433

}

1434

dup2(devnull, STDIN_FILENO);

1435

close(devnull);

1436

dup2(STDERR_FILENO, STDOUT_FILENO);

1437

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1438

if(ret == -1){

1439

perror_plus("setenv");

1440

_exit(EX_OSERR);

1441

}

1442

ret = setenv("DEVICE", interface, 1);

1443

if(ret == -1){

1444

perror_plus("setenv");

1445

_exit(EX_OSERR);

1446

}

1447

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

1448

if(ret == -1){

1449

perror_plus("setenv");

1450

_exit(EX_OSERR);

1451

}

1452

ret = setenv("MODE", mode, 1);

1453

if(ret == -1){

1454

perror_plus("setenv");

1455

_exit(EX_OSERR);

1456

}

1457

char *delaystring;

1458

ret = asprintf(&delaystring, "%f", delay);

1459

if(ret == -1){

1460

perror_plus("asprintf");

1461

_exit(EX_OSERR);

1462

}

1463

ret = setenv("DELAY", delaystring, 1);

1464

if(ret == -1){

1465

free(delaystring);

1466

perror_plus("setenv");

1467

_exit(EX_OSERR);

1468

}

1667

1469

free(delaystring);

1668

perror_plus("setenv");

1669

_exit(EX_OSERR);

1670

}

1671

free(delaystring);

1672

if(connect_to != NULL){

1673

ret = setenv("CONNECT", connect_to, 1);

1674

if(ret == -1){

1675

perror_plus("setenv");

1676

_exit(EX_OSERR);

1677

}

1678

}

1679

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1470

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

1680

1471

perror_plus("execl");

1681

_exit(EXIT_FAILURE);

1682

}

1683

} else {

1684

int status;

1685

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1686

perror_plus("waitpid");

1687

free(fullname);

1688

continue;

1689

}

1690

if(WIFEXITED(status)){

1691

if(WEXITSTATUS(status) != 0){

1692

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1693

" with status %d\n", direntry->d_name,

1694

WEXITSTATUS(status));

1695

free(fullname);

1696

continue;

1697

}

1698

} else if(WIFSIGNALED(status)){

1699

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1700

" signal %d\n", direntry->d_name,

1701

WTERMSIG(status));

1702

free(fullname);

1703

continue;

1704

} else {

1705

fprintf_plus(stderr, "Warning: network hook \"%s\""

1706

" crashed\n", direntry->d_name);

1707

free(fullname);

1708

continue;

1709

}

1710

}

1711

free(fullname);

1712

if(debug){

1713

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1714

direntry->d_name);

1715

}

1716

}

1717

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1718

perror_plus("close");

1719

} else {

1720

hookdir_fd = -1;

1721

}

1722

close(devnull);

1723

}

1724

1725

__attribute__((nonnull, warn_unused_result))

1726

error_t bring_up_interface(const char *const interface,

1727

const float delay){

1728

error_t old_errno = errno;

1729

int ret;

1730

struct ifreq network;

1731

unsigned int if_index = if_nametoindex(interface);

1732

if(if_index == 0){

1733

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

1734

errno = old_errno;

1735

return ENXIO;

1736

}

1737

1738

if(quit_now){

1739

errno = old_errno;

1740

return EINTR;

1741

}

1742

1743

if(not interface_is_up(interface)){

1744

error_t ret_errno = 0, ioctl_errno = 0;

1745

if(not get_flags(interface, &network)){

1746

ret_errno = errno;

1747

fprintf_plus(stderr, "Failed to get flags for interface "

1748

"\"%s\"\n", interface);

1749

errno = old_errno;

1750

return ret_errno;

1751

}

1752

network.ifr_flags |= IFF_UP; /* set flag */

1753

1754

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

1755

if(sd == -1){

1756

ret_errno = errno;

1757

perror_plus("socket");

1758

errno = old_errno;

1759

return ret_errno;

1760

}

1761

1762

if(quit_now){

1763

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

1764

if(ret == -1){

1765

perror_plus("close");

1766

}

1767

errno = old_errno;

1768

return EINTR;

1769

}

1770

1771

if(debug){

1772

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1773

interface);

1774

}

1775

1776

/* Raise privileges */

1777

ret_errno = raise_privileges();

1778

if(ret_errno != 0){

1779

perror_plus("Failed to raise privileges");

1780

}

1781

1782

#ifdef __linux__

1783

int ret_linux;

1784

bool restore_loglevel = false;

1785

if(ret_errno == 0){

1786

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1787

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

1788

ret_linux = klogctl(8, NULL, 5);

1789

if(ret_linux == -1){

1790

perror_plus("klogctl");

1791

} else {

1792

restore_loglevel = true;

1793

}

1794

}

1795

#endif /* __linux__ */

1796

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1797

ioctl_errno = errno;

1798

#ifdef __linux__

1799

if(restore_loglevel){

1800

ret_linux = klogctl(7, NULL, 0);

1801

if(ret_linux == -1){

1802

perror_plus("klogctl");

1803

}

1804

}

1805

#endif /* __linux__ */

1806

1807

/* If raise_privileges() succeeded above */

1808

if(ret_errno == 0){

1809

/* Lower privileges */

1810

ret_errno = lower_privileges();

1811

if(ret_errno != 0){

1812

errno = ret_errno;

1813

perror_plus("Failed to lower privileges");

1814

}

1815

}

1816

1817

/* Close the socket */

1818

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

1819

if(ret == -1){

1820

perror_plus("close");

1821

}

1822

1823

if(ret_setflags == -1){

1824

errno = ioctl_errno;

1825

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1826

errno = old_errno;

1827

return ioctl_errno;

1828

}

1829

} else if(debug){

1830

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1831

interface);

1832

}

1833

1834

/* Sleep checking until interface is running.

1835

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

1836

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

1837

if(interface_is_running(interface)){

1838

break;

1839

}

1840

struct timespec sleeptime = { .tv_nsec = 250000000 };

1841

ret = nanosleep(&sleeptime, NULL);

1842

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

1843

perror_plus("nanosleep");

1844

}

1845

}

1846

1847

errno = old_errno;

1848

return 0;

1849

}

1850

1851

__attribute__((nonnull, warn_unused_result))

1852

error_t take_down_interface(const char *const interface){

1853

error_t old_errno = errno;

1854

struct ifreq network;

1855

unsigned int if_index = if_nametoindex(interface);

1856

if(if_index == 0){

1857

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

1858

errno = old_errno;

1859

return ENXIO;

1860

}

1861

if(interface_is_up(interface)){

1862

error_t ret_errno = 0, ioctl_errno = 0;

1863

if(not get_flags(interface, &network) and debug){

1864

ret_errno = errno;

1865

fprintf_plus(stderr, "Failed to get flags for interface "

1866

"\"%s\"\n", interface);

1867

errno = old_errno;

1868

return ret_errno;

1869

}

1870

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

1871

1872

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

1873

if(sd == -1){

1874

ret_errno = errno;

1875

perror_plus("socket");

1876

errno = old_errno;

1877

return ret_errno;

1878

}

1879

1880

if(debug){

1881

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

1882

interface);

1883

}

1884

1885

/* Raise privileges */

1886

ret_errno = raise_privileges();

1887

if(ret_errno != 0){

1888

perror_plus("Failed to raise privileges");

1889

}

1890

1891

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1892

ioctl_errno = errno;

1893

1894

/* If raise_privileges() succeeded above */

1895

if(ret_errno == 0){

1896

/* Lower privileges */

1897

ret_errno = lower_privileges();

1898

if(ret_errno != 0){

1899

errno = ret_errno;

1900

perror_plus("Failed to lower privileges");

1901

}

1902

}

1903

1904

/* Close the socket */

1905

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

1906

if(ret == -1){

1907

perror_plus("close");

1908

}

1909

1910

if(ret_setflags == -1){

1911

errno = ioctl_errno;

1912

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1913

errno = old_errno;

1914

return ioctl_errno;

1915

}

1916

} else if(debug){

1917

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1918

interface);

1919

}

1920

1921

errno = old_errno;

1922

return 0;

1472

} else {

1473

int status;

1474

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1475

perror_plus("waitpid");

1476

free(fullname);

1477

continue;

1478

}

1479

if(WIFEXITED(status)){

1480

if(WEXITSTATUS(status) != 0){

1481

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1482

" with status %d\n", direntry->d_name,

1483

WEXITSTATUS(status));

1484

free(fullname);

1485

continue;

1486

}

1487

} else if(WIFSIGNALED(status)){

1488

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1489

" signal %d\n", direntry->d_name,

1490

WTERMSIG(status));

1491

free(fullname);

1492

continue;

1493

} else {

1494

fprintf_plus(stderr, "Warning: network hook \"%s\""

1495

" crashed\n", direntry->d_name);

1496

free(fullname);

1497

continue;

1498

}

1499

}

1500

free(fullname);

1501

if(debug){

1502

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1503

direntry->d_name);

1504

}

1505

}

1506

close(devnull);

1507

}

1508

return true;

1923

1509

}

1924

1510

1925

1511

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

1926

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1927

.priority = "SECURE256:!CTYPE-X.509:"

1928

"+CTYPE-OPENPGP", .current_server = NULL,

1929

.interfaces = NULL, .interfaces_size = 0 };

1930

1512

AvahiSServiceBrowser *sb = NULL;

1931

error_t ret_errno;

1513

int error;

1932

1514

int ret;

1933

1515

intmax_t tmpmax;

1934

1516

char *tmp;

1935

1517

int exitcode = EXIT_SUCCESS;

1936

char *interfaces_to_take_down = NULL;

1937

size_t interfaces_to_take_down_size = 0;

1938

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1939

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

1940

char *tempdir = NULL;

1518

const char *interface = "";

1519

struct ifreq network;

1520

int sd = -1;

1521

bool take_down_interface = false;

1522

uid_t uid;

1523

gid_t gid;

1524

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

1525

bool tempdir_created = false;

1941

1526

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1942

1527

const char *seckey = PATHDIR "/" SECKEY;

1943

1528

const char *pubkey = PATHDIR "/" PUBKEY;

1944

char *interfaces_hooks = NULL;

1945

1529

1946

1530

bool gnutls_initialized = false;

1947

1531

bool gpgme_initialized = false;

2009

1593

.group = 2 },

2010

1594

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

2011

1595

.arg = "SECONDS",

2012

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

1596

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

2013

1597

.group = 2 },

2014

1598

{ .name = "network-hook-dir", .key = 133,

2015

1599

.arg = "DIR",

2038

1622

connect_to = arg;

2039

1623

break;

2040

1624

case 'i': /* --interface */

2041

ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,

2042

arg, (int)',');

2043

if(ret_errno != 0){

2044

argp_error(state, "%s", strerror(ret_errno));

2045

}

1625

interface = arg;

2046

1626

break;

2047

1627

case 's': /* --seckey */

2048

1628

seckey = arg;

2091

1671

argp_state_help(state, state->out_stream,

2092

1672

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

2093

1673

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

1674

fprintf_plus(state->out_stream,

1675

"Mandos plugin mandos-client: ");

2094

1676

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

2095

1677

exit(argp_err_exit_status);

2096

1678

break;

2125

1707

/* Work around Debian bug #633582:

2126

1708

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

2127

1709

2128

/* Re-raise privileges */

2129

ret_errno = raise_privileges();

2130

if(ret_errno != 0){

2131

errno = ret_errno;

2132

perror_plus("Failed to raise privileges");

1710

/* Re-raise priviliges */

1711

errno = 0;

1712

ret = seteuid(0);

1713

if(ret == -1){

1714

perror_plus("seteuid");

2133

1715

} else {

2134

1716

struct stat st;

2135

1717

2176

1758

}

2177

1759

2178

1760

/* Lower privileges */

2179

ret_errno = lower_privileges();

2180

if(ret_errno != 0){

2181

errno = ret_errno;

2182

perror_plus("Failed to lower privileges");

2183

}

2184

}

2185

}

2186

2187

/* Remove invalid interface names (except "none") */

2188

{

2189

char *interface = NULL;

2190

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2191

interface))){

2192

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

2193

and if_nametoindex(interface) == 0){

2194

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

2195

fprintf_plus(stderr, "Not using nonexisting interface"

2196

" \"%s\"\n", interface);

2197

}

2198

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2199

interface = NULL;

1761

errno = 0;

1762

ret = seteuid(uid);

1763

if(ret == -1){

1764

perror_plus("seteuid");

2200

1765

}

2201

1766

}

2202

1767

}

2203

1768

2204

1769

/* Run network hooks */

2205

{

2206

if(mc.interfaces != NULL){

2207

interfaces_hooks = malloc(mc.interfaces_size);

2208

if(interfaces_hooks == NULL){

2209

perror_plus("malloc");

2210

goto end;

2211

}

2212

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2213

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2214

}

2215

run_network_hooks("start", interfaces_hooks != NULL ?

2216

interfaces_hooks : "", delay);

1770

if(not run_network_hooks("start", interface, delay)){

1771

goto end;

2217

1772

}

2218

1773

2219

1774

if(not debug){

2220

1775

avahi_set_log_function(empty_log);

2221

1776

}

2222

1777

1778

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

1779

struct dirent **direntries;

1780

/* First look for interfaces that are up */

1781

ret = scandir(sys_class_net, &direntries, up_interface,

1782

alphasort);

1783

if(ret == 0){

1784

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

1785

free(direntries);

1786

ret = scandir(sys_class_net, &direntries, good_interface,

1787

alphasort);

1788

}

1789

if(ret >= 1){

1790

/* Pick the first interface returned */

1791

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

1792

if(debug){

1793

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

1794

}

1795

if(interface == NULL){

1796

perror_plus("malloc");

1797

free(direntries);

1798

exitcode = EXIT_FAILURE;

1799

goto end;

1800

}

1801

free(direntries);

1802

} else {

1803

free(direntries);

1804

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

1805

exitcode = EXIT_FAILURE;

1806

goto end;

1807

}

1808

}

1809

2223

1810

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

2224

1811

from the signal handler */

2225

1812

/* Initialize the pseudo-RNG for Avahi */

2226

1813

srand((unsigned int) time(NULL));

2227

simple_poll = avahi_simple_poll_new();

2228

if(simple_poll == NULL){

1814

mc.simple_poll = avahi_simple_poll_new();

1815

if(mc.simple_poll == NULL){

2229

1816

fprintf_plus(stderr,

2230

1817

"Avahi: Failed to create simple poll object.\n");

2231

1818

exitcode = EX_UNAVAILABLE;

2295

1882

}

2296

1883

}

2297

1884

2298

/* If no interfaces were specified, make a list */

2299

if(mc.interfaces == NULL){

2300

struct dirent **direntries;

2301

/* Look for any good interfaces */

2302

ret = scandir(sys_class_net, &direntries, good_interface,

2303

alphasort);

2304

if(ret >= 1){

2305

/* Add all found interfaces to interfaces list */

2306

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

2307

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2308

direntries[i]->d_name);

2309

if(ret_errno != 0){

2310

errno = ret_errno;

2311

perror_plus("argz_add");

2312

continue;

2313

}

2314

if(debug){

2315

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2316

direntries[i]->d_name);

2317

}

2318

}

2319

free(direntries);

2320

} else {

2321

free(direntries);

2322

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

2323

exitcode = EXIT_FAILURE;

2324

goto end;

2325

}

2326

}

2327

2328

/* Bring up interfaces which are down, and remove any "none"s */

2329

{

2330

char *interface = NULL;

2331

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2332

interface))){

2333

/* If interface name is "none", stop bringing up interfaces.

2334

Also remove all instances of "none" from the list */

2335

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

2336

argz_delete(&mc.interfaces, &mc.interfaces_size,

2337

interface);

2338

interface = NULL;

2339

while((interface = argz_next(mc.interfaces,

2340

mc.interfaces_size, interface))){

2341

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

2342

argz_delete(&mc.interfaces, &mc.interfaces_size,

2343

interface);

2344

interface = NULL;

1885

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

1886

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

1887

if_index = (AvahiIfIndex) if_nametoindex(interface);

1888

if(if_index == 0){

1889

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

1890

exitcode = EX_UNAVAILABLE;

1891

goto end;

1892

}

1893

1894

if(quit_now){

1895

goto end;

1896

}

1897

1898

/* Re-raise priviliges */

1899

errno = 0;

1900

ret = seteuid(0);

1901

if(ret == -1){

1902

perror_plus("seteuid");

1903

}

1904

1905

#ifdef __linux__

1906

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1907

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

1908

ret = klogctl(8, NULL, 5);

1909

bool restore_loglevel = true;

1910

if(ret == -1){

1911

restore_loglevel = false;

1912

perror_plus("klogctl");

1913

}

1914

#endif /* __linux__ */

1915

1916

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1917

if(sd < 0){

1918

perror_plus("socket");

1919

exitcode = EX_OSERR;

1920

#ifdef __linux__

1921

if(restore_loglevel){

1922

ret = klogctl(7, NULL, 0);

1923

if(ret == -1){

1924

perror_plus("klogctl");

1925

}

1926

}

1927

#endif /* __linux__ */

1928

/* Lower privileges */

1929

errno = 0;

1930

ret = seteuid(uid);

1931

if(ret == -1){

1932

perror_plus("seteuid");

1933

}

1934

goto end;

1935

}

1936

strcpy(network.ifr_name, interface);

1937

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

1938

if(ret == -1){

1939

perror_plus("ioctl SIOCGIFFLAGS");

1940

#ifdef __linux__

1941

if(restore_loglevel){

1942

ret = klogctl(7, NULL, 0);

1943

if(ret == -1){

1944

perror_plus("klogctl");

1945

}

1946

}

1947

#endif /* __linux__ */

1948

exitcode = EX_OSERR;

1949

/* Lower privileges */

1950

errno = 0;

1951

ret = seteuid(uid);

1952

if(ret == -1){

1953

perror_plus("seteuid");

1954

}

1955

goto end;

1956

}

1957

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

1958

network.ifr_flags |= IFF_UP;

1959

take_down_interface = true;

1960

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

1961

if(ret == -1){

1962

take_down_interface = false;

1963

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1964

exitcode = EX_OSERR;

1965

#ifdef __linux__

1966

if(restore_loglevel){

1967

ret = klogctl(7, NULL, 0);

1968

if(ret == -1){

1969

perror_plus("klogctl");

2345

1970

}

2346

1971

}

1972

#endif /* __linux__ */

1973

/* Lower privileges */

1974

errno = 0;

1975

ret = seteuid(uid);

1976

if(ret == -1){

1977

perror_plus("seteuid");

1978

}

1979

goto end;

1980

}

1981

}

1982

/* Sleep checking until interface is running.

1983

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

1984

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

1985

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

1986

if(ret == -1){

1987

perror_plus("ioctl SIOCGIFFLAGS");

1988

} else if(network.ifr_flags & IFF_RUNNING){

2347

1989

break;

2348

1990

}

2349

bool interface_was_up = interface_is_up(interface);

2350

errno = bring_up_interface(interface, delay);

2351

if(not interface_was_up){

2352

if(errno != 0){

2353

perror_plus("Failed to bring up interface");

2354

} else {

2355

errno = argz_add(&interfaces_to_take_down,

2356

&interfaces_to_take_down_size,

2357

interface);

2358

if(errno != 0){

2359

perror_plus("argz_add");

2360

}

2361

}

2362

}

2363

}

2364

if(debug and (interfaces_to_take_down == NULL)){

2365

fprintf_plus(stderr, "No interfaces were brought up\n");

2366

}

2367

}

2368

2369

/* If we only got one interface, explicitly use only that one */

2370

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2371

if(debug){

2372

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2373

mc.interfaces);

2374

}

2375

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

1991

struct timespec sleeptime = { .tv_nsec = 250000000 };

1992

ret = nanosleep(&sleeptime, NULL);

1993

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

1994

perror_plus("nanosleep");

1995

}

1996

}

1997

if(not take_down_interface){

1998

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

1999

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

2000

if(ret == -1){

2001

perror_plus("close");

2002

}

2003

}

2004

#ifdef __linux__

2005

if(restore_loglevel){

2006

/* Restores kernel loglevel to default */

2007

ret = klogctl(7, NULL, 0);

2008

if(ret == -1){

2009

perror_plus("klogctl");

2010

}

2011

}

2012

#endif /* __linux__ */

2013

/* Lower privileges */

2014

errno = 0;

2015

/* Lower privileges */

2016

ret = seteuid(uid);

2017

if(ret == -1){

2018

perror_plus("seteuid");

2019

}

2376

2020

}

2377

2021

2378

2022

if(quit_now){

2379

2023

goto end;

2380

2024

}

2381

2025

2382

ret = init_gnutls_global(pubkey, seckey, &mc);

2026

ret = init_gnutls_global(pubkey, seckey);

2383

2027

if(ret == -1){

2384

2028

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

2385

2029

exitcode = EX_UNAVAILABLE;

2392

2036

goto end;

2393

2037

}

2394

2038

2395

/* Try /run/tmp before /tmp */

2396

tempdir = mkdtemp(run_tempdir);

2397

if(tempdir == NULL and errno == ENOENT){

2398

if(debug){

2399

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2400

run_tempdir, old_tempdir);

2401

}

2402

tempdir = mkdtemp(old_tempdir);

2403

}

2404

if(tempdir == NULL){

2039

if(mkdtemp(tempdir) == NULL){

2405

2040

perror_plus("mkdtemp");

2406

2041

goto end;

2407

2042

}

2043

tempdir_created = true;

2408

2044

2409

2045

if(quit_now){

2410

2046

goto end;

2411

2047

}

2412

2048

2413

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

2049

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

2414

2050

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

2415

2051

exitcode = EX_UNAVAILABLE;

2416

2052

goto end;

2426

2062

/* Connect directly, do not use Zeroconf */

2427

2063

/* (Mainly meant for debugging) */

2428

2064

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

2429

2430

2065

if(address == NULL){

2431

2066

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

2432

2067

exitcode = EX_USAGE;

2437

2072

goto end;

2438

2073

}

2439

2074

2440

in_port_t port;

2075

uint16_t port;

2441

2076

errno = 0;

2442

2077

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

2443

2078

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

2444

or tmpmax != (in_port_t)tmpmax){

2079

or tmpmax != (uint16_t)tmpmax){

2445

2080

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

2446

2081

exitcode = EX_USAGE;

2447

2082

goto end;

2448

2083

}

2449

2084

2450

2085

if(quit_now){

2451

2086

goto end;

2452

2087

}

2453

2088

2454

port = (in_port_t)tmpmax;

2089

port = (uint16_t)tmpmax;

2455

2090

*address = '\0';

2456

2091

/* Colon in address indicates IPv6 */

2457

2092

int af;

2473

2108

}

2474

2109

2475

2110

while(not quit_now){

2476

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

2477

&mc);

2111

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

2478

2112

if(quit_now or ret == 0){

2479

2113

break;

2480

2114

}

2482

2116

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

2483

2117

(int)retry_interval);

2484

2118

}

2485

sleep((unsigned int)retry_interval);

2119

sleep((int)retry_interval);

2486

2120

}

2487

2121

2488

if(not quit_now){

2122

if (not quit_now){

2489

2123

exitcode = EXIT_SUCCESS;

2490

2124

}

2491

2125

2506

2140

config.publish_domain = 0;

2507

2141

2508

2142

/* Allocate a new server */

2509

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2510

&config, NULL, NULL, &ret_errno);

2143

mc.server = avahi_server_new(avahi_simple_poll_get

2144

(mc.simple_poll), &config, NULL,

2145

NULL, &error);

2511

2146

2512

2147

/* Free the Avahi configuration data */

2513

2148

avahi_server_config_free(&config);

2516

2151

/* Check if creating the Avahi server object succeeded */

2517

2152

if(mc.server == NULL){

2518

2153

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

2519

avahi_strerror(ret_errno));

2154

avahi_strerror(error));

2520

2155

exitcode = EX_UNAVAILABLE;

2521

2156

goto end;

2522

2157

}

2528

2163

/* Create the Avahi service browser */

2529

2164

sb = avahi_s_service_browser_new(mc.server, if_index,

2530

2165

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2531

NULL, 0, browse_callback,

2532

(void *)&mc);

2166

NULL, 0, browse_callback, NULL);

2533

2167

if(sb == NULL){

2534

2168

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

2535

2169

avahi_strerror(avahi_server_errno(mc.server)));

2546

2180

if(debug){

2547

2181

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

2548

2182

}

2549

2550

ret = avahi_loop_with_timeout(simple_poll,

2551

(int)(retry_interval * 1000), &mc);

2183

2184

ret = avahi_loop_with_timeout(mc.simple_poll,

2185

(int)(retry_interval * 1000));

2552

2186

if(debug){

2553

2187

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

2554

2188

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

2561

2195

}

2562

2196

2563

2197

/* Cleanup things */

2564

free(mc.interfaces);

2565

2566

2198

if(sb != NULL)

2567

2199

avahi_s_service_browser_free(sb);

2568

2200

2569

2201

if(mc.server != NULL)

2570

2202

avahi_server_free(mc.server);

2571

2203

2572

if(simple_poll != NULL)

2573

avahi_simple_poll_free(simple_poll);

2204

if(mc.simple_poll != NULL)

2205

avahi_simple_poll_free(mc.simple_poll);

2574

2206

2575

2207

if(gnutls_initialized){

2576

2208

gnutls_certificate_free_credentials(mc.cred);

2593

2225

}

2594

2226

}

2595

2227

2596

/* Re-raise privileges */

2228

/* Run network hooks */

2229

run_network_hooks("stop", interface, delay);

2230

2231

/* Re-raise priviliges */

2597

2232

{

2598

ret_errno = raise_privileges();

2599

if(ret_errno != 0){

2600

perror_plus("Failed to raise privileges");

2601

} else {

2602

2603

/* Run network hooks */

2604

run_network_hooks("stop", interfaces_hooks != NULL ?

2605

interfaces_hooks : "", delay);

2606

2607

/* Take down the network interfaces which were brought up */

2608

{

2609

char *interface = NULL;

2610

while((interface=argz_next(interfaces_to_take_down,

2611

interfaces_to_take_down_size,

2612

interface))){

2613

ret_errno = take_down_interface(interface);

2614

if(ret_errno != 0){

2615

errno = ret_errno;

2616

perror_plus("Failed to take down interface");

2617

}

2618

}

2619

if(debug and (interfaces_to_take_down == NULL)){

2620

fprintf_plus(stderr, "No interfaces needed to be taken"

2621

" down\n");

2622

}

2623

}

2233

errno = 0;

2234

ret = seteuid(0);

2235

if(ret == -1){

2236

perror_plus("seteuid");

2624

2237

}

2625

2238

2626

ret_errno = lower_privileges_permanently();

2627

if(ret_errno != 0){

2628

perror_plus("Failed to lower privileges permanently");

2239

/* Take down the network interface */

2240

if(take_down_interface and geteuid() == 0){

2241

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

2242

if(ret == -1){

2243

perror_plus("ioctl SIOCGIFFLAGS");

2244

} else if(network.ifr_flags & IFF_UP){

2245

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

2246

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

2247

if(ret == -1){

2248

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2249

}

2250

}

2251

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

2252

if(ret == -1){

2253

perror_plus("close");

2254

}

2629

2255

}

2630

2256

}

2631

2632

free(interfaces_to_take_down);

2633

free(interfaces_hooks);

2257

/* Lower privileges permanently */

2258

errno = 0;

2259

ret = setuid(uid);

2260

if(ret == -1){

2261

perror_plus("setuid");

2262

}

2634

2263

2635

2264

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

2636

if(tempdir != NULL){

2265

if(tempdir_created){

2637

2266

struct dirent **direntries = NULL;

2638

2267

struct dirent *direntry = NULL;

2639

2268

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

2640

2269

alphasort);

2641

if(numentries > 0){

2270

if (numentries > 0){

2642

2271

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

2643

2272

direntry = direntries[i];

2644

2273

char *fullname = NULL;

2656

2285

free(fullname);

2657

2286

}

2658

2287

}

2659

2288

2660

2289

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

2661

2290

free(direntries);

2662

if(numentries == -1){

2291

if (numentries == -1){

2663

2292

perror_plus("scandir");

2664

2293

}

2665

2294

ret = rmdir(tempdir);