/mandos/release : revision 237.7.239

9

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

10

*

11

* Everything else is

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13

12

13

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*

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* 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

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

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#endif /* not _FILE_OFFSET_BITS */

39

40

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

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42

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

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stdout, ferror(), remove() */

44

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

44

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

45

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

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

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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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inet_pton(), connect(),

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getnameinfo() */

59

60

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

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61

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

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62

*/

62

63

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

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64

strtoimax() */

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

65

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

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program_invocation_short_name */

67

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

74

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

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

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

77

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

77

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

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(),

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WEXITSTATUS(), WTERMSIG() */

90

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

91

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

92

argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

94

argz_count() */

95

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

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EAI_SYSTEM, gai_strerror() */

91

97

92

98

#ifdef __linux__

93

99

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

135

141

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

136

142

char *connect_to = NULL;

137

143

const char *hookdir = HOOKDIR;

144

int hookdir_fd = -1;

145

uid_t uid = 65534;

146

gid_t gid = 65534;

138

147

139

148

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

140

149

typedef struct server{

141

150

const char *ip;

142

uint16_t port;

151

in_port_t port;

143

152

AvahiIfIndex if_index;

144

153

int af;

145

154

struct timespec last_seen;

149

158

150

159

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

151

160

typedef struct {

152

AvahiSimplePoll *simple_poll;

153

161

AvahiServer *server;

154

162

gnutls_certificate_credentials_t cred;

155

163

unsigned int dh_bits;

157

165

const char *priority;

158

166

gpgme_ctx_t ctx;

159

167

server *current_server;

168

char *interfaces;

169

size_t interfaces_size;

160

170

} mandos_context;

161

171

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 };

172

/* global so signal handler can reach it*/

173

AvahiSimplePoll *simple_poll;

167

174

168

175

sig_atomic_t quit_now = 0;

169

176

int signal_received = 0;

170

177

171

178

/* Function to use when printing errors */

172

179

void perror_plus(const char *print_text){

180

int e = errno;

173

181

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

174

182

program_invocation_short_name);

183

errno = e;

175

184

perror(print_text);

176

185

}

177

186

178

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

187

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

179

188

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

180

189

va_list ap;

181

190

va_start (ap, format);

182

191

183

192

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

184

193

program_invocation_short_name));

185

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

194

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

186

195

}

187

196

188

197

/*

190

199

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

191

200

* "buffer_length" is how much is already used.

192

201

*/

202

__attribute__((nonnull, warn_unused_result))

193

203

size_t incbuffer(char **buffer, size_t buffer_length,

194

204

size_t buffer_capacity){

195

205

if(buffer_length + BUFFER_SIZE > buffer_capacity){

196

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

197

if(buffer == NULL){

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;

198

212

return 0;

199

213

}

214

*buffer = new_buf;

200

215

buffer_capacity += BUFFER_SIZE;

201

216

}

202

217

return buffer_capacity;

203

218

}

204

219

205

220

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

206

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

207

int af){

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){

208

224

int ret;

209

225

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

210

226

if(new_server == NULL){

219

235

perror_plus("strdup");

220

236

return false;

221

237

}

238

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

239

if(ret == -1){

240

perror_plus("clock_gettime");

241

return false;

242

}

222

243

/* Special case of first server */

223

if (mc.current_server == NULL){

244

if(*current_server == NULL){

224

245

new_server->next = new_server;

225

246

new_server->prev = new_server;

226

mc.current_server = new_server;

227

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

247

*current_server = new_server;

228

248

} else {

229

new_server->next = mc.current_server;

230

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

249

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

250

new_server->next = *current_server;

251

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

231

252

new_server->prev->next = new_server;

232

mc.current_server->prev = new_server;

233

}

234

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

235

if(ret == -1){

236

perror_plus("clock_gettime");

237

return false;

253

(*current_server)->prev = new_server;

238

254

}

239

255

return true;

240

256

}

242

258

/*

243

259

* Initialize GPGME.

244

260

*/

245

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

246

const char *tempdir){

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){

247

266

gpgme_error_t rc;

248

267

gpgme_engine_info_t engine_info;

249

268

250

251

269

/*

252

270

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

253

271

*/

254

bool import_key(const char *filename){

272

bool import_key(const char * const filename){

255

273

int ret;

256

274

int fd;

257

275

gpgme_data_t pgp_data;

269

287

return false;

270

288

}

271

289

272

rc = gpgme_op_import(mc.ctx, pgp_data);

290

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

273

291

if(rc != GPG_ERR_NO_ERROR){

274

292

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

275

293

gpgme_strsource(rc), gpgme_strerror(rc));

319

337

}

320

338

321

339

/* Create new GPGME "context" */

322

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

340

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

323

341

if(rc != GPG_ERR_NO_ERROR){

324

342

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

325

343

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

338

356

* Decrypt OpenPGP data.

339

357

* Returns -1 on error

340

358

*/

359

__attribute__((nonnull, warn_unused_result))

341

360

static ssize_t pgp_packet_decrypt(const char *cryptotext,

342

361

size_t crypto_size,

343

char **plaintext){

362

char **plaintext,

363

mandos_context *mc){

344

364

gpgme_data_t dh_crypto, dh_plain;

345

365

gpgme_error_t rc;

346

366

ssize_t ret;

372

392

373

393

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

374

394

data buffer */

375

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

395

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

376

396

if(rc != GPG_ERR_NO_ERROR){

377

397

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

378

398

gpgme_strsource(rc), gpgme_strerror(rc));

379

399

plaintext_length = -1;

380

400

if(debug){

381

401

gpgme_decrypt_result_t result;

382

result = gpgme_op_decrypt_result(mc.ctx);

402

result = gpgme_op_decrypt_result(mc->ctx);

383

403

if(result == NULL){

384

404

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

385

405

} else {

462

482

return plaintext_length;

463

483

}

464

484

465

static const char * safer_gnutls_strerror(int value){

466

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

467

-Wunreachable-code */

485

__attribute__((warn_unused_result))

486

static const char *safer_gnutls_strerror(int value){

487

const char *ret = gnutls_strerror(value);

468

488

if(ret == NULL)

469

489

ret = "(unknown)";

470

490

return ret;

471

491

}

472

492

473

493

/* GnuTLS log function callback */

494

__attribute__((nonnull))

474

495

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

475

496

const char* string){

476

497

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

477

498

}

478

499

500

__attribute__((nonnull, warn_unused_result))

479

501

static int init_gnutls_global(const char *pubkeyfilename,

480

const char *seckeyfilename){

502

const char *seckeyfilename,

503

mandos_context *mc){

481

504

int ret;

482

505

483

506

if(debug){

500

523

}

501

524

502

525

/* OpenPGP credentials */

503

ret = gnutls_certificate_allocate_credentials(&mc.cred);

526

ret = gnutls_certificate_allocate_credentials(&mc->cred);

504

527

if(ret != GNUTLS_E_SUCCESS){

505

528

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

506

529

safer_gnutls_strerror(ret));

516

539

}

517

540

518

541

ret = gnutls_certificate_set_openpgp_key_file

519

(mc.cred, pubkeyfilename, seckeyfilename,

542

(mc->cred, pubkeyfilename, seckeyfilename,

520

543

GNUTLS_OPENPGP_FMT_BASE64);

521

544

if(ret != GNUTLS_E_SUCCESS){

522

545

fprintf_plus(stderr,

528

551

}

529

552

530

553

/* GnuTLS server initialization */

531

ret = gnutls_dh_params_init(&mc.dh_params);

554

ret = gnutls_dh_params_init(&mc->dh_params);

532

555

if(ret != GNUTLS_E_SUCCESS){

533

556

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

534

557

" initialization: %s\n",

535

558

safer_gnutls_strerror(ret));

536

559

goto globalfail;

537

560

}

538

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

561

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

539

562

if(ret != GNUTLS_E_SUCCESS){

540

563

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

541

564

safer_gnutls_strerror(ret));

542

565

goto globalfail;

543

566

}

544

567

545

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

568

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

546

569

547

570

return 0;

548

571

549

572

globalfail:

550

573

551

gnutls_certificate_free_credentials(mc.cred);

574

gnutls_certificate_free_credentials(mc->cred);

552

575

gnutls_global_deinit();

553

gnutls_dh_params_deinit(mc.dh_params);

576

gnutls_dh_params_deinit(mc->dh_params);

554

577

return -1;

555

578

}

556

579

557

static int init_gnutls_session(gnutls_session_t *session){

580

__attribute__((nonnull, warn_unused_result))

581

static int init_gnutls_session(gnutls_session_t *session,

582

mandos_context *mc){

558

583

int ret;

559

584

/* GnuTLS session creation */

560

585

do {

572

597

{

573

598

const char *err;

574

599

do {

575

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

600

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

576

601

if(quit_now){

577

602

gnutls_deinit(*session);

578

603

return -1;

589

614

590

615

do {

591

616

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

592

mc.cred);

617

mc->cred);

593

618

if(quit_now){

594

619

gnutls_deinit(*session);

595

620

return -1;

605

630

/* ignore client certificate if any. */

606

631

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

607

632

608

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

633

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

609

634

610

635

return 0;

611

636

}

615

640

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

616

641

617

642

/* Called when a Mandos server is found */

618

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

643

__attribute__((nonnull, warn_unused_result))

644

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

619

645

AvahiIfIndex if_index,

620

int af){

646

int af, mandos_context *mc){

621

647

int ret, tcp_sd = -1;

622

648

ssize_t sret;

623

union {

624

struct sockaddr_in in;

625

struct sockaddr_in6 in6;

626

} to;

649

struct sockaddr_storage to;

627

650

char *buffer = NULL;

628

651

char *decrypted_buffer = NULL;

629

652

size_t buffer_length = 0;

653

676

return -1;

654

677

}

655

678

656

ret = init_gnutls_session(&session);

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);

657

712

if(ret != 0){

658

713

return -1;

659

714

}

660

715

661

716

if(debug){

662

717

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

663

PRIu16 "\n", ip, port);

718

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

664

719

}

665

720

666

721

tcp_sd = socket(pf, SOCK_STREAM, 0);

678

733

679

734

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

680

735

if(af == AF_INET6){

681

to.in6.sin6_family = (sa_family_t)af;

682

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

736

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

737

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

683

738

} else { /* IPv4 */

684

to.in.sin_family = (sa_family_t)af;

685

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

739

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

740

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

686

741

}

687

742

if(ret < 0 ){

688

743

int e = errno;

697

752

goto mandos_end;

698

753

}

699

754

if(af == AF_INET6){

700

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

701

-Wconversion and

702

-Wunreachable-code */

703

704

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

705

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

706

-Wunreachable-code*/

755

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

756

if(IN6_IS_ADDR_LINKLOCAL

757

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

707

758

if(if_index == AVAHI_IF_UNSPEC){

708

759

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

709

760

" incomplete without a network interface\n");

711

762

goto mandos_end;

712

763

}

713

764

/* Set the network interface number as scope */

714

to.in6.sin6_scope_id = (uint32_t)if_index;

765

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

715

766

}

716

767

} else {

717

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

718

-Wconversion and

719

-Wunreachable-code */

768

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

720

769

}

721

770

722

771

if(quit_now){

730

779

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

731

780

perror_plus("if_indextoname");

732

781

} else {

733

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

734

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

782

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

783

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

735

784

}

736

785

} else {

737

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

738

ip, port);

786

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

787

ip, (uintmax_t)port);

739

788

}

740

789

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

741

790

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

742

const char *pcret;

743

791

if(af == AF_INET6){

744

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

745

sizeof(addrstr));

792

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

793

sizeof(struct sockaddr_in6),

794

addrstr, sizeof(addrstr), NULL, 0,

795

NI_NUMERICHOST);

746

796

} else {

747

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

748

sizeof(addrstr));

797

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

798

sizeof(struct sockaddr_in),

799

addrstr, sizeof(addrstr), NULL, 0,

800

NI_NUMERICHOST);

749

801

}

750

if(pcret == NULL){

751

perror_plus("inet_ntop");

752

} else {

753

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

754

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

755

}

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);

756

808

}

757

809

}

758

810

762

814

}

763

815

764

816

if(af == AF_INET6){

765

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

817

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

818

sizeof(struct sockaddr_in6));

766

819

} else {

767

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

820

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

821

sizeof(struct sockaddr_in));

768

822

}

769

823

if(ret < 0){

770

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

824

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

771

825

int e = errno;

772

826

perror_plus("connect");

773

827

errno = e;

819

873

goto mandos_end;

820

874

}

821

875

822

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

823

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

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);

824

881

825

882

if(quit_now){

826

883

errno = EINTR;

931

988

if(buffer_length > 0){

932

989

ssize_t decrypted_buffer_size;

933

990

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

934

&decrypted_buffer);

991

&decrypted_buffer, mc);

935

992

if(decrypted_buffer_size >= 0){

936

993

937

994

written = 0;

985

1042

return retval;

986

1043

}

987

1044

1045

__attribute__((nonnull))

988

1046

static void resolve_callback(AvahiSServiceResolver *r,

989

1047

AvahiIfIndex interface,

990

1048

AvahiProtocol proto,

998

1056

AVAHI_GCC_UNUSED AvahiStringList *txt,

999

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1000

1058

flags,

1001

AVAHI_GCC_UNUSED void* userdata){

1002

assert(r);

1059

void *mc){

1060

if(r == NULL){

1061

return;

1062

}

1003

1063

1004

1064

/* Called whenever a service has been resolved successfully or

1005

1065

timed out */

1014

1074

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

1015

1075

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

1016

1076

domain,

1017

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_strerror(avahi_server_errno

1078

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

1018

1079

break;

1019

1080

1020

1081

case AVAHI_RESOLVER_FOUND:

1026

1087

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

1027

1088

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

1028

1089

}

1029

int ret = start_mandos_communication(ip, port, interface,

1030

avahi_proto_to_af(proto));

1090

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

1091

interface,

1092

avahi_proto_to_af(proto),

1093

mc);

1031

1094

if(ret == 0){

1032

avahi_simple_poll_quit(mc.simple_poll);

1095

avahi_simple_poll_quit(simple_poll);

1033

1096

} else {

1034

if(not add_server(ip, port, interface,

1035

avahi_proto_to_af(proto))){

1097

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

1098

avahi_proto_to_af(proto),

1099

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

1036

1100

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

1037

1101

" list\n", name);

1038

1102

}

1051

1115

const char *domain,

1052

1116

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1053

1117

flags,

1054

AVAHI_GCC_UNUSED void* userdata){

1055

assert(b);

1118

void *mc){

1119

if(b == NULL){

1120

return;

1121

}

1056

1122

1057

1123

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

1058

1124

is removed from the LAN */

1066

1132

case AVAHI_BROWSER_FAILURE:

1067

1133

1068

1134

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

1069

avahi_strerror(avahi_server_errno(mc.server)));

1070

avahi_simple_poll_quit(mc.simple_poll);

1135

avahi_strerror(avahi_server_errno

1136

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

1137

avahi_simple_poll_quit(simple_poll);

1071

1138

return;

1072

1139

1073

1140

case AVAHI_BROWSER_NEW:

1076

1143

the callback function is called the Avahi server will free the

1077

1144

resolver for us. */

1078

1145

1079

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

1080

name, type, domain, protocol, 0,

1081

resolve_callback, NULL) == NULL)

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)

1082

1150

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

1083

1151

" %s\n", name,

1084

avahi_strerror(avahi_server_errno(mc.server)));

1152

avahi_strerror(avahi_server_errno

1153

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

1085

1154

break;

1086

1155

1087

1156

case AVAHI_BROWSER_REMOVE:

1106

1175

signal_received = sig;

1107

1176

int old_errno = errno;

1108

1177

/* set main loop to exit */

1109

if(mc.simple_poll != NULL){

1110

avahi_simple_poll_quit(mc.simple_poll);

1178

if(simple_poll != NULL){

1179

avahi_simple_poll_quit(simple_poll);

1111

1180

}

1112

1181

errno = old_errno;

1113

1182

}

1114

1183

1184

__attribute__((nonnull, warn_unused_result))

1115

1185

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

1116

1186

int ret;

1187

error_t ret_errno;

1117

1188

1118

1189

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

1119

1190

if(s < 0){

1191

ret_errno = errno;

1120

1192

perror_plus("socket");

1193

errno = ret_errno;

1121

1194

return false;

1122

1195

}

1123

1196

strcpy(ifr->ifr_name, ifname);

1124

1197

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1125

1198

if(ret == -1){

1126

1199

if(debug){

1200

ret_errno = errno;

1127

1201

perror_plus("ioctl SIOCGIFFLAGS");

1202

errno = ret_errno;

1128

1203

}

1129

1204

return false;

1130

1205

}

1131

1206

return true;

1132

1207

}

1133

1208

1209

__attribute__((nonnull, warn_unused_result))

1134

1210

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

1135

1211

1136

1212

/* Reject the loopback device */

1178

1254

* corresponds to an acceptable network device.

1179

1255

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

1180

1256

*/

1257

__attribute__((nonnull, warn_unused_result))

1181

1258

int good_interface(const struct dirent *if_entry){

1182

1259

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

1183

1260

return 0;

1199

1276

}

1200

1277

1201

1278

/*

1202

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

1203

* corresponds to an acceptable network device which is up.

1204

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

1205

*/

1206

int up_interface(const struct dirent *if_entry){

1207

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

1208

return 0;

1209

}

1210

1211

struct ifreq ifr;

1212

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

1213

if(debug){

1214

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

1215

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

1216

}

1217

return 0;

1218

}

1219

1220

/* Reject down interfaces */

1221

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

1222

if(debug){

1223

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

1224

if_entry->d_name);

1225

}

1226

return 0;

1227

}

1228

1229

/* Reject non-running interfaces */

1230

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

1231

if(debug){

1232

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

1233

if_entry->d_name);

1234

}

1235

return 0;

1236

}

1237

1238

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

1239

return 0;

1240

}

1241

return 1;

1242

}

1243

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))

1244

1313

int notdotentries(const struct dirent *direntry){

1245

1314

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

1246

1315

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

1253

1322

}

1254

1323

1255

1324

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

1325

__attribute__((nonnull, warn_unused_result))

1256

1326

int runnable_hook(const struct dirent *direntry){

1257

1327

int ret;

1258

1328

size_t sret;

1266

1336

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

1267

1337

"abcdefghijklmnopqrstuvwxyz"

1268

1338

"0123456789"

1269

"_-");

1339

"_.-");

1270

1340

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

1271

1341

/* Contains non-allowed characters */

1272

1342

if(debug){

1290

1360

}

1291

1361

return 0;

1292

1362

}

1363

free(fullname);

1293

1364

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

1294

1365

/* Not a regular file */

1295

1366

if(debug){

1313

1384

return 1;

1314

1385

}

1315

1386

1316

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1387

__attribute__((nonnull, warn_unused_result))

1388

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1389

mandos_context *mc){

1317

1390

int ret;

1318

1391

struct timespec now;

1319

1392

struct timespec waited_time;

1320

1393

intmax_t block_time;

1321

1394

1322

1395

while(true){

1323

if(mc.current_server == NULL){

1324

if (debug){

1396

if(mc->current_server == NULL){

1397

if(debug){

1325

1398

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

1326

1399

" No timeout!\n");

1327

1400

}

1328

1401

ret = avahi_simple_poll_iterate(s, -1);

1329

1402

} else {

1330

if (debug){

1403

if(debug){

1331

1404

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

1332

1405

" it, or wait\n");

1333

1406

}

1340

1413

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

1341

1414

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

1342

1415

waited_time.tv_sec = (now.tv_sec

1343

- mc.current_server->last_seen.tv_sec);

1416

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

1344

1417

waited_time.tv_nsec = (now.tv_nsec

1345

- mc.current_server->last_seen.tv_nsec);

1418

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

1346

1419

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

1347

1420

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

1348

1421

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

1350

1423

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

1351

1424

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

1352

1425

1353

if (debug){

1426

if(debug){

1354

1427

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

1355

1428

block_time);

1356

1429

}

1357

1430

1358

1431

if(block_time <= 0){

1359

ret = start_mandos_communication(mc.current_server->ip,

1360

mc.current_server->port,

1361

mc.current_server->if_index,

1362

mc.current_server->af);

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);

1363

1436

if(ret == 0){

1364

avahi_simple_poll_quit(mc.simple_poll);

1437

avahi_simple_poll_quit(s);

1365

1438

return 0;

1366

1439

}

1367

1440

ret = clock_gettime(CLOCK_MONOTONIC,

1368

&mc.current_server->last_seen);

1441

&mc->current_server->last_seen);

1369

1442

if(ret == -1){

1370

1443

perror_plus("clock_gettime");

1371

1444

return -1;

1372

1445

}

1373

mc.current_server = mc.current_server->next;

1446

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

1374

1447

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

1375

1448

servers, but don't block */

1376

1449

}

1378

1451

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

1379

1452

}

1380

1453

if(ret != 0){

1381

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

1454

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

1382

1455

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

1383

1456

}

1384

1457

}

1385

1458

}

1386

1459

}

1387

1460

1388

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

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,

1389

1538

const float delay){

1390

1539

struct dirent **direntries;

1391

struct dirent *direntry;

1392

int ret;

1393

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

1394

alphasort);

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__ */

1395

1583

if(numhooks == -1){

1396

1584

perror_plus("scandir");

1397

} else {

1398

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

1399

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

1400

direntry = direntries[i];

1401

char *fullname = NULL;

1402

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

1403

if(ret < 0){

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){

1404

1662

perror_plus("asprintf");

1405

continue;

1406

}

1407

if(debug){

1408

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

1409

direntry->d_name);

1410

}

1411

pid_t hook_pid = fork();

1412

if(hook_pid == 0){

1413

/* Child */

1414

/* Raise privileges */

1415

errno = 0;

1416

ret = seteuid(0);

1417

if(ret == -1){

1418

perror_plus("seteuid");

1419

}

1420

/* Raise privileges even more */

1421

errno = 0;

1422

ret = setuid(0);

1423

if(ret == -1){

1424

perror_plus("setuid");

1425

}

1426

/* Set group */

1427

errno = 0;

1428

ret = setgid(0);

1429

if(ret == -1){

1430

perror_plus("setgid");

1431

}

1432

/* Reset supplementary groups */

1433

errno = 0;

1434

ret = setgroups(0, NULL);

1435

if(ret == -1){

1436

perror_plus("setgroups");

1437

}

1438

dup2(devnull, STDIN_FILENO);

1439

close(devnull);

1440

dup2(STDERR_FILENO, STDOUT_FILENO);

1441

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

1442

if(ret == -1){

1443

perror_plus("setenv");

1444

_exit(EX_OSERR);

1445

}

1446

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

1447

if(ret == -1){

1448

perror_plus("setenv");

1449

_exit(EX_OSERR);

1450

}

1451

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

1452

if(ret == -1){

1453

perror_plus("setenv");

1454

_exit(EX_OSERR);

1455

}

1456

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

1457

if(ret == -1){

1458

perror_plus("setenv");

1459

_exit(EX_OSERR);

1460

}

1461

char *delaystring;

1462

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

1463

if(ret == -1){

1464

perror_plus("asprintf");

1465

_exit(EX_OSERR);

1466

}

1467

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

1468

if(ret == -1){

1469

free(delaystring);

1470

perror_plus("setenv");

1471

_exit(EX_OSERR);

1472

}

1663

_exit(EX_OSERR);

1664

}

1665

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

1666

if(ret == -1){

1473

1667

free(delaystring);

1474

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

1475

perror_plus("execl");

1476

_exit(EXIT_FAILURE);

1477

}

1478

} else {

1479

int status;

1480

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

1481

perror_plus("waitpid");

1482

free(fullname);

1483

continue;

1484

}

1485

if(WIFEXITED(status)){

1486

if(WEXITSTATUS(status) != 0){

1487

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

1488

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

1489

WEXITSTATUS(status));

1490

free(fullname);

1491

continue;

1492

}

1493

} else if(WIFSIGNALED(status)){

1494

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

1495

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

1496

WTERMSIG(status));

1497

free(fullname);

1498

continue;

1499

} else {

1500

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

1501

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

1502

free(fullname);

1503

continue;

1504

}

1505

}

1506

free(fullname);

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

}

1512

close(devnull);

1513

}

1514

return true;

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){

1680

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;

1515

1923

}

1516

1924

1517

1925

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 };

1518

1930

AvahiSServiceBrowser *sb = NULL;

1519

int error;

1931

error_t ret_errno;

1520

1932

int ret;

1521

1933

intmax_t tmpmax;

1522

1934

char *tmp;

1523

1935

int exitcode = EXIT_SUCCESS;

1524

const char *interface = "";

1525

struct ifreq network;

1526

int sd = -1;

1527

bool take_down_interface = false;

1528

uid_t uid;

1529

gid_t gid;

1530

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

1531

bool tempdir_created = false;

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;

1532

1941

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1533

1942

const char *seckey = PATHDIR "/" SECKEY;

1534

1943

const char *pubkey = PATHDIR "/" PUBKEY;

1944

char *interfaces_hooks = NULL;

1535

1945

1536

1946

bool gnutls_initialized = false;

1537

1947

bool gpgme_initialized = false;

1599

2009

.group = 2 },

1600

2010

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

1601

2011

.arg = "SECONDS",

1602

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

2012

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

1603

2013

.group = 2 },

1604

2014

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

1605

2015

.arg = "DIR",

1628

2038

connect_to = arg;

1629

2039

break;

1630

2040

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

1631

interface = arg;

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

}

1632

2046

break;

1633

2047

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

1634

2048

seckey = arg;

1711

2125

/* Work around Debian bug #633582:

1712

2126

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

1713

2127

1714

/* Re-raise priviliges */

1715

errno = 0;

1716

ret = seteuid(0);

1717

if(ret == -1){

1718

perror_plus("seteuid");

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");

1719

2133

} else {

1720

2134

struct stat st;

1721

2135

1762

2176

}

1763

2177

1764

2178

/* Lower privileges */

1765

errno = 0;

1766

ret = seteuid(uid);

1767

if(ret == -1){

1768

perror_plus("seteuid");

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;

1769

2200

}

1770

2201

}

1771

2202

}

1772

2203

1773

2204

/* Run network hooks */

1774

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

1775

goto end;

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);

1776

2217

}

1777

2218

1778

2219

if(not debug){

1779

2220

avahi_set_log_function(empty_log);

1780

2221

}

1781

2222

1782

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

1783

struct dirent **direntries;

1784

/* First look for interfaces that are up */

1785

ret = scandir(sys_class_net, &direntries, up_interface,

1786

alphasort);

1787

if(ret == 0){

1788

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

1789

free(direntries);

1790

ret = scandir(sys_class_net, &direntries, good_interface,

1791

alphasort);

1792

}

1793

if(ret >= 1){

1794

/* Pick the first interface returned */

1795

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

1796

if(debug){

1797

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

1798

}

1799

if(interface == NULL){

1800

perror_plus("malloc");

1801

free(direntries);

1802

exitcode = EXIT_FAILURE;

1803

goto end;

1804

}

1805

free(direntries);

1806

} else {

1807

free(direntries);

1808

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

1809

exitcode = EXIT_FAILURE;

1810

goto end;

1811

}

1812

}

1813

1814

2223

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

1815

2224

from the signal handler */

1816

2225

/* Initialize the pseudo-RNG for Avahi */

1817

2226

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

1818

mc.simple_poll = avahi_simple_poll_new();

1819

if(mc.simple_poll == NULL){

2227

simple_poll = avahi_simple_poll_new();

2228

if(simple_poll == NULL){

1820

2229

fprintf_plus(stderr,

1821

2230

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

1822

2231

exitcode = EX_UNAVAILABLE;

1886

2295

}

1887

2296

}

1888

2297

1889

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

1890

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

1891

if_index = (AvahiIfIndex) if_nametoindex(interface);

1892

if(if_index == 0){

1893

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

1894

exitcode = EX_UNAVAILABLE;

1895

goto end;

1896

}

1897

1898

if(quit_now){

1899

goto end;

1900

}

1901

1902

/* Re-raise priviliges */

1903

errno = 0;

1904

ret = seteuid(0);

1905

if(ret == -1){

1906

perror_plus("seteuid");

1907

}

1908

1909

#ifdef __linux__

1910

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1911

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

1912

ret = klogctl(8, NULL, 5);

1913

bool restore_loglevel = true;

1914

if(ret == -1){

1915

restore_loglevel = false;

1916

perror_plus("klogctl");

1917

}

1918

#endif /* __linux__ */

1919

1920

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1921

if(sd < 0){

1922

perror_plus("socket");

1923

exitcode = EX_OSERR;

1924

#ifdef __linux__

1925

if(restore_loglevel){

1926

ret = klogctl(7, NULL, 0);

1927

if(ret == -1){

1928

perror_plus("klogctl");

1929

}

1930

}

1931

#endif /* __linux__ */

1932

/* Lower privileges */

1933

errno = 0;

1934

ret = seteuid(uid);

1935

if(ret == -1){

1936

perror_plus("seteuid");

1937

}

1938

goto end;

1939

}

1940

strcpy(network.ifr_name, interface);

1941

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

1942

if(ret == -1){

1943

perror_plus("ioctl SIOCGIFFLAGS");

1944

#ifdef __linux__

1945

if(restore_loglevel){

1946

ret = klogctl(7, NULL, 0);

1947

if(ret == -1){

1948

perror_plus("klogctl");

1949

}

1950

}

1951

#endif /* __linux__ */

1952

exitcode = EX_OSERR;

1953

/* Lower privileges */

1954

errno = 0;

1955

ret = seteuid(uid);

1956

if(ret == -1){

1957

perror_plus("seteuid");

1958

}

1959

goto end;

1960

}

1961

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

1962

network.ifr_flags |= IFF_UP;

1963

take_down_interface = true;

1964

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

1965

if(ret == -1){

1966

take_down_interface = false;

1967

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1968

exitcode = EX_OSERR;

1969

#ifdef __linux__

1970

if(restore_loglevel){

1971

ret = klogctl(7, NULL, 0);

1972

if(ret == -1){

1973

perror_plus("klogctl");

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;

1974

2345

}

1975

2346

}

1976

#endif /* __linux__ */

1977

/* Lower privileges */

1978

errno = 0;

1979

ret = seteuid(uid);

1980

if(ret == -1){

1981

perror_plus("seteuid");

1982

}

1983

goto end;

1984

}

1985

}

1986

/* Sleep checking until interface is running.

1987

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

1988

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

1989

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

1990

if(ret == -1){

1991

perror_plus("ioctl SIOCGIFFLAGS");

1992

} else if(network.ifr_flags & IFF_RUNNING){

1993

2347

break;

1994

2348

}

1995

struct timespec sleeptime = { .tv_nsec = 250000000 };

1996

ret = nanosleep(&sleeptime, NULL);

1997

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

1998

perror_plus("nanosleep");

1999

}

2000

}

2001

if(not take_down_interface){

2002

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

2003

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

2004

if(ret == -1){

2005

perror_plus("close");

2006

}

2007

}

2008

#ifdef __linux__

2009

if(restore_loglevel){

2010

/* Restores kernel loglevel to default */

2011

ret = klogctl(7, NULL, 0);

2012

if(ret == -1){

2013

perror_plus("klogctl");

2014

}

2015

}

2016

#endif /* __linux__ */

2017

/* Lower privileges */

2018

errno = 0;

2019

/* Lower privileges */

2020

ret = seteuid(uid);

2021

if(ret == -1){

2022

perror_plus("seteuid");

2023

}

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);

2024

2376

}

2025

2377

2026

2378

if(quit_now){

2027

2379

goto end;

2028

2380

}

2029

2381

2030

ret = init_gnutls_global(pubkey, seckey);

2382

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

2031

2383

if(ret == -1){

2032

2384

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

2033

2385

exitcode = EX_UNAVAILABLE;

2040

2392

goto end;

2041

2393

}

2042

2394

2043

if(mkdtemp(tempdir) == NULL){

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){

2044

2405

perror_plus("mkdtemp");

2045

2406

goto end;

2046

2407

}

2047

tempdir_created = true;

2048

2408

2049

2409

if(quit_now){

2050

2410

goto end;

2051

2411

}

2052

2412

2053

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

2413

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

2054

2414

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

2055

2415

exitcode = EX_UNAVAILABLE;

2056

2416

goto end;

2066

2426

/* Connect directly, do not use Zeroconf */

2067

2427

/* (Mainly meant for debugging) */

2068

2428

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

2429

2069

2430

if(address == NULL){

2070

2431

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

2071

2432

exitcode = EX_USAGE;

2076

2437

goto end;

2077

2438

}

2078

2439

2079

uint16_t port;

2440

in_port_t port;

2080

2441

errno = 0;

2081

2442

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

2082

2443

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

2083

or tmpmax != (uint16_t)tmpmax){

2444

or tmpmax != (in_port_t)tmpmax){

2084

2445

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

2085

2446

exitcode = EX_USAGE;

2086

2447

goto end;

2087

2448

}

2088

2449

2089

2450

if(quit_now){

2090

2451

goto end;

2091

2452

}

2092

2453

2093

port = (uint16_t)tmpmax;

2454

port = (in_port_t)tmpmax;

2094

2455

*address = '\0';

2095

2456

/* Colon in address indicates IPv6 */

2096

2457

int af;

2112

2473

}

2113

2474

2114

2475

while(not quit_now){

2115

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

2476

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

2477

&mc);

2116

2478

if(quit_now or ret == 0){

2117

2479

break;

2118

2480

}

2120

2482

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

2121

2483

(int)retry_interval);

2122

2484

}

2123

sleep((int)retry_interval);

2485

sleep((unsigned int)retry_interval);

2124

2486

}

2125

2487

2126

if (not quit_now){

2488

if(not quit_now){

2127

2489

exitcode = EXIT_SUCCESS;

2128

2490

}

2129

2491

2144

2506

config.publish_domain = 0;

2145

2507

2146

2508

/* Allocate a new server */

2147

mc.server = avahi_server_new(avahi_simple_poll_get

2148

(mc.simple_poll), &config, NULL,

2149

NULL, &error);

2509

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2510

&config, NULL, NULL, &ret_errno);

2150

2511

2151

2512

/* Free the Avahi configuration data */

2152

2513

avahi_server_config_free(&config);

2155

2516

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

2156

2517

if(mc.server == NULL){

2157

2518

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

2158

avahi_strerror(error));

2519

avahi_strerror(ret_errno));

2159

2520

exitcode = EX_UNAVAILABLE;

2160

2521

goto end;

2161

2522

}

2167

2528

/* Create the Avahi service browser */

2168

2529

sb = avahi_s_service_browser_new(mc.server, if_index,

2169

2530

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2170

NULL, 0, browse_callback, NULL);

2531

NULL, 0, browse_callback,

2532

(void *)&mc);

2171

2533

if(sb == NULL){

2172

2534

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

2173

2535

avahi_strerror(avahi_server_errno(mc.server)));

2184

2546

if(debug){

2185

2547

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

2186

2548

}

2187

2188

ret = avahi_loop_with_timeout(mc.simple_poll,

2189

(int)(retry_interval * 1000));

2549

2550

ret = avahi_loop_with_timeout(simple_poll,

2551

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

2190

2552

if(debug){

2191

2553

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

2192

2554

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

2199

2561

}

2200

2562

2201

2563

/* Cleanup things */

2564

free(mc.interfaces);

2565

2202

2566

if(sb != NULL)

2203

2567

avahi_s_service_browser_free(sb);

2204

2568

2205

2569

if(mc.server != NULL)

2206

2570

avahi_server_free(mc.server);

2207

2571

2208

if(mc.simple_poll != NULL)

2209

avahi_simple_poll_free(mc.simple_poll);

2572

if(simple_poll != NULL)

2573

avahi_simple_poll_free(simple_poll);

2210

2574

2211

2575

if(gnutls_initialized){

2212

2576

gnutls_certificate_free_credentials(mc.cred);

2229

2593

}

2230

2594

}

2231

2595

2232

/* Run network hooks */

2233

run_network_hooks("stop", interface, delay);

2234

2235

/* Re-raise priviliges */

2596

/* Re-raise privileges */

2236

2597

{

2237

errno = 0;

2238

ret = seteuid(0);

2239

if(ret == -1){

2240

perror_plus("seteuid");

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

}

2241

2624

}

2242

2625

2243

/* Take down the network interface */

2244

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

2245

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

2246

if(ret == -1){

2247

perror_plus("ioctl SIOCGIFFLAGS");

2248

} else if(network.ifr_flags & IFF_UP){

2249

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

2250

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

2251

if(ret == -1){

2252

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2253

}

2254

}

2255

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

2256

if(ret == -1){

2257

perror_plus("close");

2258

}

2626

ret_errno = lower_privileges_permanently();

2627

if(ret_errno != 0){

2628

perror_plus("Failed to lower privileges permanently");

2259

2629

}

2260

2630

}

2261

/* Lower privileges permanently */

2262

errno = 0;

2263

ret = setuid(uid);

2264

if(ret == -1){

2265

perror_plus("setuid");

2266

}

2631

2632

free(interfaces_to_take_down);

2633

free(interfaces_hooks);

2267

2634

2268

2635

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

2269

if(tempdir_created){

2636

if(tempdir != NULL){

2270

2637

struct dirent **direntries = NULL;

2271

2638

struct dirent *direntry = NULL;

2272

2639

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

2273

2640

alphasort);

2274

if (numentries > 0){

2641

if(numentries > 0){

2275

2642

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

2276

2643

direntry = direntries[i];

2277

2644

char *fullname = NULL;

2289

2656

free(fullname);

2290

2657

}

2291

2658

}

2292

2659

2293

2660

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

2294

2661

free(direntries);

2295

if (numentries == -1){

2662

if(numentries == -1){

2296

2663

perror_plus("scandir");

2297

2664

}

2298

2665

ret = rmdir(tempdir);