/mandos/release : revision 237.11.27

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

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* modify it under the terms of the GNU General Public License as

32

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

33

#ifndef _LARGEFILE_SOURCE

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#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

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#endif

36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif /* not _FILE_OFFSET_BITS */

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#endif

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40

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

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

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stdout, ferror() */

44

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

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stdout, ferror(), remove() */

44

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

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#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 */

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

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

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inet_pton(), connect(),

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getnameinfo() */

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

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inet_pton(), connect() */

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

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

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61

*/

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

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strtoimax() */

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

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

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program_invocation_short_name */

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

73

*/

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

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

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setgid(), pause(), _exit(),

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unlinkat() */

78

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

76

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

77

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

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78

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

80

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

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argp_state, struct argp,

89

88

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

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89

WEXITSTATUS(), WTERMSIG() */

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

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

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argz_delete(), argz_append(),

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argz_stringify(), argz_add(),

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argz_count() */

96

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

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EAI_SYSTEM, gai_strerror() */

98

91

99

92

#ifdef __linux__

100

93

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

142

135

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

143

136

char *connect_to = NULL;

144

137

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

uid_t uid = 65534;

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gid_t gid = 65534;

148

138

149

139

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

150

140

typedef struct server{

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141

const char *ip;

152

in_port_t port;

142

uint16_t port;

153

143

AvahiIfIndex if_index;

154

144

int af;

155

145

struct timespec last_seen;

159

149

160

150

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

161

151

typedef struct {

152

AvahiSimplePoll *simple_poll;

162

153

AvahiServer *server;

163

154

gnutls_certificate_credentials_t cred;

164

155

unsigned int dh_bits;

166

157

const char *priority;

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158

gpgme_ctx_t ctx;

168

159

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

160

} mandos_context;

172

161

173

/* global so signal handler can reach it*/

174

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 };

175

167

176

168

sig_atomic_t quit_now = 0;

177

169

int signal_received = 0;

178

170

179

171

/* Function to use when printing errors */

180

172

void perror_plus(const char *print_text){

181

int e = errno;

182

173

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

183

174

program_invocation_short_name);

184

errno = e;

185

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perror(print_text);

186

176

}

187

177

188

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

189

178

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

190

179

va_list ap;

191

180

va_start (ap, format);

192

181

193

182

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

194

183

program_invocation_short_name));

195

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

184

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

196

185

}

197

186

198

187

/*

200

189

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

201

190

* "buffer_length" is how much is already used.

202

191

*/

203

__attribute__((nonnull, warn_unused_result))

204

192

size_t incbuffer(char **buffer, size_t buffer_length,

205

193

size_t buffer_capacity){

206

194

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

195

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

196

if(buffer == NULL){

213

197

return 0;

214

198

}

215

*buffer = new_buf;

216

199

buffer_capacity += BUFFER_SIZE;

217

200

}

218

201

return buffer_capacity;

219

202

}

220

203

221

204

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

205

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

206

int af){

225

207

int ret;

226

208

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

227

209

if(new_server == NULL){

234

216

.af = af };

235

217

if(new_server->ip == NULL){

236

218

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

219

return false;

253

220

}

254

221

/* Special case of first server */

255

if(*current_server == NULL){

222

if (mc.current_server == NULL){

256

223

new_server->next = new_server;

257

224

new_server->prev = new_server;

258

*current_server = new_server;

225

mc.current_server = new_server;

226

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

259

227

} else {

260

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

261

new_server->next = *current_server;

262

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

228

new_server->next = mc.current_server;

229

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

263

230

new_server->prev->next = new_server;

264

(*current_server)->prev = new_server;

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 false;

265

237

}

266

238

return true;

267

239

}

269

241

/*

270

242

* Initialize GPGME.

271

243

*/

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

244

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

245

const char *tempdir){

277

246

gpgme_error_t rc;

278

247

gpgme_engine_info_t engine_info;

279

248

249

280

250

/*

281

251

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

282

252

*/

283

bool import_key(const char * const filename){

253

bool import_key(const char *filename){

284

254

int ret;

285

255

int fd;

286

256

gpgme_data_t pgp_data;

298

268

return false;

299

269

}

300

270

301

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

271

rc = gpgme_op_import(mc.ctx, pgp_data);

302

272

if(rc != GPG_ERR_NO_ERROR){

303

273

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

304

274

gpgme_strsource(rc), gpgme_strerror(rc));

348

318

}

349

319

350

320

/* Create new GPGME "context" */

351

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

321

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

352

322

if(rc != GPG_ERR_NO_ERROR){

353

323

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

354

324

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

367

337

* Decrypt OpenPGP data.

368

338

* Returns -1 on error

369

339

*/

370

__attribute__((nonnull, warn_unused_result))

371

340

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

341

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

342

char **plaintext){

375

343

gpgme_data_t dh_crypto, dh_plain;

376

344

gpgme_error_t rc;

377

345

ssize_t ret;

403

371

404

372

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

405

373

data buffer */

406

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

374

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

407

375

if(rc != GPG_ERR_NO_ERROR){

408

376

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

409

377

gpgme_strsource(rc), gpgme_strerror(rc));

410

378

plaintext_length = -1;

411

379

if(debug){

412

380

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

381

result = gpgme_op_decrypt_result(mc.ctx);

414

382

if(result == NULL){

415

383

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

416

384

} else {

493

461

return plaintext_length;

494

462

}

495

463

496

__attribute__((warn_unused_result, const))

497

static const char *safe_string(const char *str){

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

503

__attribute__((warn_unused_result))

504

static const char *safer_gnutls_strerror(int value){

505

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

464

static const char * safer_gnutls_strerror(int value){

465

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

466

-Wunreachable-code */

467

if(ret == NULL)

468

ret = "(unknown)";

469

return ret;

507

470

}

508

471

509

472

/* GnuTLS log function callback */

510

__attribute__((nonnull))

511

473

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

512

474

const char* string){

513

475

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

514

476

}

515

477

516

__attribute__((nonnull, warn_unused_result))

517

478

static int init_gnutls_global(const char *pubkeyfilename,

518

const char *seckeyfilename,

519

mandos_context *mc){

479

const char *seckeyfilename){

520

480

int ret;

521

unsigned int uret;

522

481

523

482

if(debug){

524

483

fprintf_plus(stderr, "Initializing GnuTLS\n");

540

499

}

541

500

542

501

/* OpenPGP credentials */

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

502

ret = gnutls_certificate_allocate_credentials(&mc.cred);

544

503

if(ret != GNUTLS_E_SUCCESS){

545

504

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

546

505

safer_gnutls_strerror(ret));

556

515

}

557

516

558

517

ret = gnutls_certificate_set_openpgp_key_file

559

(mc->cred, pubkeyfilename, seckeyfilename,

518

(mc.cred, pubkeyfilename, seckeyfilename,

560

519

GNUTLS_OPENPGP_FMT_BASE64);

561

520

if(ret != GNUTLS_E_SUCCESS){

562

521

fprintf_plus(stderr,

568

527

}

569

528

570

529

/* GnuTLS server initialization */

571

ret = gnutls_dh_params_init(&mc->dh_params);

530

ret = gnutls_dh_params_init(&mc.dh_params);

572

531

if(ret != GNUTLS_E_SUCCESS){

573

532

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

574

533

" initialization: %s\n",

575

534

safer_gnutls_strerror(ret));

576

535

goto globalfail;

577

536

}

578

if(mc->dh_bits == 0){

579

/* Find out the optimal number of DH bits */

580

/* Try to read the private key file */

581

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

585

while(true){

586

buffer_capacity = incbuffer((char **)&buffer.data,

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

/* If successful, use buffer to parse private key */

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

627

if(ret != GNUTLS_E_SUCCESS){

628

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

" GnuTLS security parameter \"%s\".\n",

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

663

" implies %u DH bits; using that.\n",

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

668

} else {

669

fprintf_plus(stderr, "Failed to get implied number of DH"

670

" bits for security parameter \"%s\"): %s\n",

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

677

mc->dh_bits);

678

}

679

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

537

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

680

538

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

539

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

540

safer_gnutls_strerror(ret));

683

541

goto globalfail;

684

542

}

685

543

686

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

544

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

687

545

688

546

return 0;

689

547

690

548

globalfail:

691

549

692

gnutls_certificate_free_credentials(mc->cred);

550

gnutls_certificate_free_credentials(mc.cred);

693

551

gnutls_global_deinit();

694

gnutls_dh_params_deinit(mc->dh_params);

552

gnutls_dh_params_deinit(mc.dh_params);

695

553

return -1;

696

554

}

697

555

698

__attribute__((nonnull, warn_unused_result))

699

static int init_gnutls_session(gnutls_session_t *session,

700

mandos_context *mc){

556

static int init_gnutls_session(gnutls_session_t *session){

701

557

int ret;

702

558

/* GnuTLS session creation */

703

559

do {

715

571

{

716

572

const char *err;

717

573

do {

718

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

574

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

719

575

if(quit_now){

720

576

gnutls_deinit(*session);

721

577

return -1;

732

588

733

589

do {

734

590

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

735

mc->cred);

591

mc.cred);

736

592

if(quit_now){

737

593

gnutls_deinit(*session);

738

594

return -1;

748

604

/* ignore client certificate if any. */

749

605

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

750

606

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

607

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

752

608

753

609

return 0;

754

610

}

757

613

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

758

614

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

759

615

760

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

761

__attribute__((warn_unused_result))

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

765

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

766

ret_errno = errno;

767

}

768

errno = old_errno;

769

return ret_errno;

770

}

771

772

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

773

__attribute__((warn_unused_result))

774

error_t raise_privileges_permanently(void){

775

error_t old_errno = errno;

776

error_t ret_errno = raise_privileges();

777

if(ret_errno != 0){

778

errno = old_errno;

779

return ret_errno;

780

}

781

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

782

ret_errno = errno;

783

}

784

errno = old_errno;

785

return ret_errno;

786

}

787

788

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

789

__attribute__((warn_unused_result))

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

793

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

794

ret_errno = errno;

795

}

796

errno = old_errno;

797

return ret_errno;

798

}

799

800

/* Lower privileges permanently */

801

__attribute__((warn_unused_result))

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

805

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

806

ret_errno = errno;

807

}

808

errno = old_errno;

809

return ret_errno;

810

}

811

812

/* Helper function to add_local_route() and delete_local_route() */

813

__attribute__((nonnull, warn_unused_result))

814

static bool add_delete_local_route(const bool add,

815

const char *address,

816

AvahiIfIndex if_index){

817

int ret;

818

char helper[] = "mandos-client-iprouteadddel";

819

char add_arg[] = "add";

820

char delete_arg[] = "delete";

821

char debug_flag[] = "--debug";

822

char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");

823

if(pluginhelperdir == NULL){

824

if(debug){

825

fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"

826

" variable not set; cannot run helper\n");

827

}

828

return false;

829

}

830

831

char interface[IF_NAMESIZE];

832

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

833

perror_plus("if_indextoname");

834

return false;

835

}

836

837

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

838

if(devnull == -1){

839

perror_plus("open(\"/dev/null\", O_RDONLY)");

840

return false;

841

}

842

pid_t pid = fork();

843

if(pid == 0){

844

/* Child */

845

/* Raise privileges */

846

errno = raise_privileges_permanently();

847

if(errno != 0){

848

perror_plus("Failed to raise privileges");

849

/* _exit(EX_NOPERM); */

850

} else {

851

/* Set group */

852

errno = 0;

853

ret = setgid(0);

854

if(ret == -1){

855

perror_plus("setgid");

856

_exit(EX_NOPERM);

857

}

858

/* Reset supplementary groups */

859

errno = 0;

860

ret = setgroups(0, NULL);

861

if(ret == -1){

862

perror_plus("setgroups");

863

_exit(EX_NOPERM);

864

}

865

}

866

ret = dup2(devnull, STDIN_FILENO);

867

if(ret == -1){

868

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

869

_exit(EX_OSERR);

870

}

871

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

872

if(ret == -1){

873

perror_plus("close");

874

_exit(EX_OSERR);

875

}

876

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

877

if(ret == -1){

878

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

879

_exit(EX_OSERR);

880

}

881

int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,

882

O_RDONLY

883

| O_DIRECTORY

884

| O_PATH

885

| O_CLOEXEC));

886

if(helperdir_fd == -1){

887

perror_plus("open");

888

_exit(EX_UNAVAILABLE);

889

}

890

int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,

891

helper, O_RDONLY));

892

if(helper_fd == -1){

893

perror_plus("openat");

894

_exit(EX_UNAVAILABLE);

895

}

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

897

#ifdef __GNUC__

898

#pragma GCC diagnostic push

899

#pragma GCC diagnostic ignored "-Wcast-qual"

900

#endif

901

if(fexecve(helper_fd, (char *const [])

902

{ helper, add ? add_arg : delete_arg, (char *)address,

903

interface, debug ? debug_flag : NULL, NULL },

904

environ) == -1){

905

#ifdef __GNUC__

906

#pragma GCC diagnostic pop

907

#endif

908

perror_plus("fexecve");

909

_exit(EXIT_FAILURE);

910

}

911

}

912

if(pid == -1){

913

perror_plus("fork");

914

return false;

915

}

916

int status;

917

pid_t pret = -1;

918

errno = 0;

919

do {

920

pret = waitpid(pid, &status, 0);

921

if(pret == -1 and errno == EINTR and quit_now){

922

int errno_raising = 0;

923

if((errno = raise_privileges()) != 0){

924

errno_raising = errno;

925

perror_plus("Failed to raise privileges in order to"

926

" kill helper program");

927

}

928

if(kill(pid, SIGTERM) == -1){

929

perror_plus("kill");

930

}

931

if((errno_raising == 0) and (errno = lower_privileges()) != 0){

932

perror_plus("Failed to lower privileges after killing"

933

" helper program");

934

}

935

return false;

936

}

937

} while(pret == -1 and errno == EINTR);

938

if(pret == -1){

939

perror_plus("waitpid");

940

return false;

941

}

942

if(WIFEXITED(status)){

943

if(WEXITSTATUS(status) != 0){

944

fprintf_plus(stderr, "Error: iprouteadddel exited"

945

" with status %d\n", WEXITSTATUS(status));

946

return false;

947

}

948

return true;

949

}

950

if(WIFSIGNALED(status)){

951

fprintf_plus(stderr, "Error: iprouteadddel died by"

952

" signal %d\n", WTERMSIG(status));

953

return false;

954

}

955

fprintf_plus(stderr, "Error: iprouteadddel crashed\n");

956

return false;

957

}

958

959

__attribute__((nonnull, warn_unused_result))

960

static bool add_local_route(const char *address,

961

AvahiIfIndex if_index){

962

if(debug){

963

fprintf_plus(stderr, "Adding route to %s\n", address);

964

}

965

return add_delete_local_route(true, address, if_index);

966

}

967

968

__attribute__((nonnull, warn_unused_result))

969

static bool delete_local_route(const char *address,

970

AvahiIfIndex if_index){

971

if(debug){

972

fprintf_plus(stderr, "Removing route to %s\n", address);

973

}

974

return add_delete_local_route(false, address, if_index);

975

}

976

977

616

/* Called when a Mandos server is found */

978

__attribute__((nonnull, warn_unused_result))

979

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

617

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

980

618

AvahiIfIndex if_index,

981

int af, mandos_context *mc){

619

int af){

982

620

int ret, tcp_sd = -1;

983

621

ssize_t sret;

984

struct sockaddr_storage to;

622

union {

623

struct sockaddr_in in;

624

struct sockaddr_in6 in6;

625

} to;

985

626

char *buffer = NULL;

986

627

char *decrypted_buffer = NULL;

987

628

size_t buffer_length = 0;

990

631

int retval = -1;

991

632

gnutls_session_t session;

992

633

int pf; /* Protocol family */

993

bool route_added = false;

994

634

995

635

errno = 0;

996

636

1012

652

return -1;

1013

653

}

1014

654

1015

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

1016

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

1017

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

1018

bool match = false;

1019

{

1020

char *interface = NULL;

1021

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

1022

interface))){

1023

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

1024

match = true;

1025

break;

1026

}

1027

}

1028

}

1029

if(not match){

1030

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

1031

connect to the server */

1032

if(debug){

1033

char interface[IF_NAMESIZE];

1034

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

1035

perror_plus("if_indextoname");

1036

} else {

1037

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

1038

" \"%s\"\n",

1039

if_indextoname((unsigned int)if_index,

1040

interface));

1041

}

1042

}

1043

return -1;

1044

}

1045

}

1046

1047

ret = init_gnutls_session(&session, mc);

655

ret = init_gnutls_session(&session);

1048

656

if(ret != 0){

1049

657

return -1;

1050

658

}

1051

659

1052

660

if(debug){

1053

661

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

1054

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

662

PRIu16 "\n", ip, port);

1055

663

}

1056

664

1057

tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);

665

tcp_sd = socket(pf, SOCK_STREAM, 0);

1058

666

if(tcp_sd < 0){

1059

667

int e = errno;

1060

668

perror_plus("socket");

1069

677

1070

678

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

1071

679

if(af == AF_INET6){

1072

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

1073

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);

1074

682

} else { /* IPv4 */

1075

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

1076

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);

1077

685

}

1078

686

if(ret < 0 ){

1079

687

int e = errno;

1088

696

goto mandos_end;

1089

697

}

1090

698

if(af == AF_INET6){

1091

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

1092

if(IN6_IS_ADDR_LINKLOCAL

1093

(&((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*/

1094

706

if(if_index == AVAHI_IF_UNSPEC){

1095

707

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

1096

708

" incomplete without a network interface\n");

1098

710

goto mandos_end;

1099

711

}

1100

712

/* Set the network interface number as scope */

1101

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

713

to.in6.sin6_scope_id = (uint32_t)if_index;

1102

714

}

1103

715

} else {

1104

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

716

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

717

-Wconversion and

718

-Wunreachable-code */

1105

719

}

1106

720

1107

721

if(quit_now){

1115

729

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

1116

730

perror_plus("if_indextoname");

1117

731

} else {

1118

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

1119

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

732

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

733

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

1120

734

}

1121

735

} else {

1122

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

1123

ip, (uintmax_t)port);

736

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

737

ip, port);

1124

738

}

1125

739

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

1126

740

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1127

if(af == AF_INET6){

1128

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

1129

sizeof(struct sockaddr_in6),

1130

addrstr, sizeof(addrstr), NULL, 0,

1131

NI_NUMERICHOST);

1132

} else {

1133

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

1134

sizeof(struct sockaddr_in),

1135

addrstr, sizeof(addrstr), NULL, 0,

1136

NI_NUMERICHOST);

1137

}

1138

if(ret == EAI_SYSTEM){

1139

perror_plus("getnameinfo");

1140

} else if(ret != 0) {

1141

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

1142

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

1143

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

1144

}

1145

}

1146

1147

if(quit_now){

1148

errno = EINTR;

1149

goto mandos_end;

1150

}

1151

1152

while(true){

1153

if(af == AF_INET6){

1154

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

1155

sizeof(struct sockaddr_in6));

1156

} else {

1157

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

1158

sizeof(struct sockaddr_in));

1159

}

1160

if(ret < 0){

1161

if(errno == ENETUNREACH

1162

and if_index != AVAHI_IF_UNSPEC

1163

and connect_to == NULL

1164

and not route_added and

1165

((af == AF_INET6 and not

1166

IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)

1167

&to)->sin6_addr)))

1168

or (af == AF_INET and

1169

/* Not a a IPv4LL address */

1170

(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)

1171

& 0xFFFF0000L) != 0xA9FE0000L))){

1172

/* Work around Avahi bug - Avahi does not announce link-local

1173

addresses if it has a global address, so local hosts with

1174

*only* a link-local address (e.g. Mandos clients) cannot

1175

connect to a Mandos server announced by Avahi on a server

1176

host with a global address. Work around this by retrying

1177

with an explicit route added with the server's address.

1178

1179

Avahi bug reference:

1180

http://lists.freedesktop.org/archives/avahi/2010-February/001833.html

1181

https://bugs.debian.org/587961

1182

*/

1183

if(debug){

1184

fprintf_plus(stderr, "Mandos server unreachable, trying"

1185

" direct route\n");

1186

}

1187

int e = errno;

1188

route_added = add_local_route(ip, if_index);

1189

if(route_added){

1190

continue;

1191

}

1192

errno = e;

1193

}

1194

if(errno != ECONNREFUSED or debug){

1195

int e = errno;

1196

perror_plus("connect");

1197

errno = e;

1198

}

1199

goto mandos_end;

1200

}

1201

1202

if(quit_now){

1203

errno = EINTR;

1204

goto mandos_end;

1205

}

1206

break;

741

const char *pcret;

742

if(af == AF_INET6){

743

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

744

sizeof(addrstr));

745

} else {

746

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

747

sizeof(addrstr));

748

}

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

}

755

}

756

}

757

758

if(quit_now){

759

errno = EINTR;

760

goto mandos_end;

761

}

762

763

if(af == AF_INET6){

764

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

765

} else {

766

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

767

}

768

if(ret < 0){

769

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

770

int e = errno;

771

perror_plus("connect");

772

errno = e;

773

}

774

goto mandos_end;

775

}

776

777

if(quit_now){

778

errno = EINTR;

779

goto mandos_end;

1207

780

}

1208

781

1209

782

const char *out = mandos_protocol_version;

1245

818

goto mandos_end;

1246

819

}

1247

820

1248

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

1249

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

1250

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

1251

gnutls_transport_set_ptr(session,

1252

(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);

1253

823

1254

824

if(quit_now){

1255

825

errno = EINTR;

1360

930

if(buffer_length > 0){

1361

931

ssize_t decrypted_buffer_size;

1362

932

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1363

&decrypted_buffer, mc);

933

&decrypted_buffer);

1364

934

if(decrypted_buffer_size >= 0){

1365

935

1366

936

written = 0;

1392

962

1393

963

mandos_end:

1394

964

{

1395

if(route_added){

1396

if(not delete_local_route(ip, if_index)){

1397

fprintf_plus(stderr, "Failed to delete local route to %s on"

1398

" interface %d", ip, if_index);

1399

}

1400

}

1401

965

int e = errno;

1402

966

free(decrypted_buffer);

1403

967

free(buffer);

1420

984

return retval;

1421

985

}

1422

986

1423

__attribute__((nonnull))

1424

987

static void resolve_callback(AvahiSServiceResolver *r,

1425

988

AvahiIfIndex interface,

1426

989

AvahiProtocol proto,

1434

997

AVAHI_GCC_UNUSED AvahiStringList *txt,

1435

998

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1436

999

flags,

1437

void *mc){

1438

if(r == NULL){

1439

return;

1440

}

1000

AVAHI_GCC_UNUSED void* userdata){

1001

assert(r);

1441

1002

1442

1003

/* Called whenever a service has been resolved successfully or

1443

1004

timed out */

1444

1005

1445

1006

if(quit_now){

1446

avahi_s_service_resolver_free(r);

1447

1007

return;

1448

1008

}

1449

1009

1453

1013

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

1454

1014

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

1455

1015

domain,

1456

avahi_strerror(avahi_server_errno

1457

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

1016

avahi_strerror(avahi_server_errno(mc.server)));

1458

1017

break;

1459

1018

1460

1019

case AVAHI_RESOLVER_FOUND:

1466

1025

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

1467

1026

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

1468

1027

}

1469

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

1470

interface,

1471

avahi_proto_to_af(proto),

1472

mc);

1028

int ret = start_mandos_communication(ip, port, interface,

1029

avahi_proto_to_af(proto));

1473

1030

if(ret == 0){

1474

avahi_simple_poll_quit(simple_poll);

1031

avahi_simple_poll_quit(mc.simple_poll);

1475

1032

} else {

1476

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

1477

avahi_proto_to_af(proto),

1478

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

1033

if(not add_server(ip, port, interface,

1034

avahi_proto_to_af(proto))){

1479

1035

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

1480

1036

" list\n", name);

1481

1037

}

1494

1050

const char *domain,

1495

1051

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1496

1052

flags,

1497

void *mc){

1498

if(b == NULL){

1499

return;

1500

}

1053

AVAHI_GCC_UNUSED void* userdata){

1054

assert(b);

1501

1055

1502

1056

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

1503

1057

is removed from the LAN */

1511

1065

case AVAHI_BROWSER_FAILURE:

1512

1066

1513

1067

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

1514

avahi_strerror(avahi_server_errno

1515

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

1516

avahi_simple_poll_quit(simple_poll);

1068

avahi_strerror(avahi_server_errno(mc.server)));

1069

avahi_simple_poll_quit(mc.simple_poll);

1517

1070

return;

1518

1071

1519

1072

case AVAHI_BROWSER_NEW:

1522

1075

the callback function is called the Avahi server will free the

1523

1076

resolver for us. */

1524

1077

1525

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

1526

interface, protocol, name, type,

1527

domain, protocol, 0,

1528

resolve_callback, mc) == NULL)

1078

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

1079

name, type, domain, protocol, 0,

1080

resolve_callback, NULL) == NULL)

1529

1081

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

1530

1082

" %s\n", name,

1531

avahi_strerror(avahi_server_errno

1532

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

1083

avahi_strerror(avahi_server_errno(mc.server)));

1533

1084

break;

1534

1085

1535

1086

case AVAHI_BROWSER_REMOVE:

1554

1105

signal_received = sig;

1555

1106

int old_errno = errno;

1556

1107

/* set main loop to exit */

1557

if(simple_poll != NULL){

1558

avahi_simple_poll_quit(simple_poll);

1108

if(mc.simple_poll != NULL){

1109

avahi_simple_poll_quit(mc.simple_poll);

1559

1110

}

1560

1111

errno = old_errno;

1561

1112

}

1562

1113

1563

__attribute__((nonnull, warn_unused_result))

1564

1114

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

1565

1115

int ret;

1566

error_t ret_errno;

1567

1116

1568

1117

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

1569

1118

if(s < 0){

1570

ret_errno = errno;

1571

1119

perror_plus("socket");

1572

errno = ret_errno;

1573

1120

return false;

1574

1121

}

1575

1122

strcpy(ifr->ifr_name, ifname);

1576

1123

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1577

1124

if(ret == -1){

1578

1125

if(debug){

1579

ret_errno = errno;

1580

1126

perror_plus("ioctl SIOCGIFFLAGS");

1581

errno = ret_errno;

1582

1127

}

1583

1128

return false;

1584

1129

}

1585

1130

return true;

1586

1131

}

1587

1132

1588

__attribute__((nonnull, warn_unused_result))

1589

1133

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

1590

1134

1591

1135

/* Reject the loopback device */

1633

1177

* corresponds to an acceptable network device.

1634

1178

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

1635

1179

*/

1636

__attribute__((nonnull, warn_unused_result))

1637

1180

int good_interface(const struct dirent *if_entry){

1638

1181

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

1639

1182

return 0;

1655

1198

}

1656

1199

1657

1200

/*

1658

* This function determines if a network interface is up.

1659

*/

1660

__attribute__((nonnull, warn_unused_result))

1661

bool interface_is_up(const char *interface){

1662

struct ifreq ifr;

1663

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

1664

if(debug){

1665

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

1666

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

1667

}

1668

return false;

1669

}

1670

1671

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

1672

}

1673

1674

/*

1675

* This function determines if a network interface is running

1676

*/

1677

__attribute__((nonnull, warn_unused_result))

1678

bool interface_is_running(const char *interface){

1679

struct ifreq ifr;

1680

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

1681

if(debug){

1682

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

1683

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

1684

}

1685

return false;

1686

}

1687

1688

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

1689

}

1690

1691

__attribute__((nonnull, pure, warn_unused_result))

1201

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

1202

* corresponds to an acceptable network device which is up.

1203

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

1204

*/

1205

int up_interface(const struct dirent *if_entry){

1206

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

1207

return 0;

1208

}

1209

1210

struct ifreq ifr;

1211

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

1212

if(debug){

1213

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

1214

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

1215

}

1216

return 0;

1217

}

1218

1219

/* Reject down interfaces */

1220

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

1221

if(debug){

1222

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

1223

if_entry->d_name);

1224

}

1225

return 0;

1226

}

1227

1228

/* Reject non-running interfaces */

1229

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

1230

if(debug){

1231

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

1232

if_entry->d_name);

1233

}

1234

return 0;

1235

}

1236

1237

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

1238

return 0;

1239

}

1240

return 1;

1241

}

1242

1692

1243

int notdotentries(const struct dirent *direntry){

1693

1244

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

1694

1245

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

1701

1252

}

1702

1253

1703

1254

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

1704

__attribute__((nonnull, warn_unused_result))

1705

1255

int runnable_hook(const struct dirent *direntry){

1706

1256

int ret;

1707

1257

size_t sret;

1715

1265

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

1716

1266

"abcdefghijklmnopqrstuvwxyz"

1717

1267

"0123456789"

1718

"_.-");

1268

"_-");

1719

1269

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

1720

1270

/* Contains non-allowed characters */

1721

1271

if(debug){

1725

1275

return 0;

1726

1276

}

1727

1277

1728

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1278

char *fullname = NULL;

1279

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

1280

if(ret < 0){

1281

perror_plus("asprintf");

1282

return 0;

1283

}

1284

1285

ret = stat(fullname, &st);

1729

1286

if(ret == -1){

1730

1287

if(debug){

1731

1288

perror_plus("Could not stat hook");

1755

1312

return 1;

1756

1313

}

1757

1314

1758

__attribute__((nonnull, warn_unused_result))

1759

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1760

mandos_context *mc){

1315

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1761

1316

int ret;

1762

1317

struct timespec now;

1763

1318

struct timespec waited_time;

1764

1319

intmax_t block_time;

1765

1320

1766

1321

while(true){

1767

if(mc->current_server == NULL){

1768

if(debug){

1322

if(mc.current_server == NULL){

1323

if (debug){

1769

1324

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

1770

1325

" No timeout!\n");

1771

1326

}

1772

1327

ret = avahi_simple_poll_iterate(s, -1);

1773

1328

} else {

1774

if(debug){

1329

if (debug){

1775

1330

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

1776

1331

" it, or wait\n");

1777

1332

}

1784

1339

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

1785

1340

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

1786

1341

waited_time.tv_sec = (now.tv_sec

1787

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

1342

- mc.current_server->last_seen.tv_sec);

1788

1343

waited_time.tv_nsec = (now.tv_nsec

1789

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

1344

- mc.current_server->last_seen.tv_nsec);

1790

1345

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

1791

1346

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

1792

1347

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

1794

1349

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

1795

1350

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

1796

1351

1797

if(debug){

1352

if (debug){

1798

1353

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

1799

1354

block_time);

1800

1355

}

1801

1356

1802

1357

if(block_time <= 0){

1803

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

1804

mc->current_server->port,

1805

mc->current_server->if_index,

1806

mc->current_server->af, mc);

1358

ret = start_mandos_communication(mc.current_server->ip,

1359

mc.current_server->port,

1360

mc.current_server->if_index,

1361

mc.current_server->af);

1807

1362

if(ret == 0){

1808

avahi_simple_poll_quit(s);

1363

avahi_simple_poll_quit(mc.simple_poll);

1809

1364

return 0;

1810

1365

}

1811

1366

ret = clock_gettime(CLOCK_MONOTONIC,

1812

&mc->current_server->last_seen);

1367

&mc.current_server->last_seen);

1813

1368

if(ret == -1){

1814

1369

perror_plus("clock_gettime");

1815

1370

return -1;

1816

1371

}

1817

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

1372

mc.current_server = mc.current_server->next;

1818

1373

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

1819

1374

servers, but don't block */

1820

1375

}

1822

1377

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

1823

1378

}

1824

1379

if(ret != 0){

1825

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

1380

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

1826

1381

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

1827

1382

}

1828

1383

}

1829

1384

}

1830

1385

}

1831

1386

1832

__attribute__((nonnull))

1833

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

1387

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

1834

1388

const float delay){

1835

struct dirent **direntries = NULL;

1836

if(hookdir_fd == -1){

1837

hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH

1838

| O_CLOEXEC);

1839

if(hookdir_fd == -1){

1840

if(errno == ENOENT){

1841

if(debug){

1842

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

1843

" found\n", hookdir);

1844

}

1845

} else {

1846

perror_plus("open");

1847

}

1848

return;

1849

}

1850

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

1853

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

1854

runnable_hook, alphasort);

1855

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

1856

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

1857

alphasort);

1858

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

1859

#else /* not __GLIBC__ */

1860

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

1861

alphasort);

1862

#endif /* not __GLIBC__ */

1389

struct dirent **direntries;

1390

struct dirent *direntry;

1391

int ret;

1392

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

1393

alphasort);

1863

1394

if(numhooks == -1){

1864

1395

perror_plus("scandir");

1865

return;

1866

}

1867

struct dirent *direntry;

1868

int ret;

1869

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

1870

if(devnull == -1){

1871

perror_plus("open(\"/dev/null\", O_RDONLY)");

1872

return;

1873

}

1874

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

1875

direntry = direntries[i];

1876

if(debug){

1877

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

1878

direntry->d_name);

1879

}

1880

pid_t hook_pid = fork();

1881

if(hook_pid == 0){

1882

/* Child */

1883

/* Raise privileges */

1884

errno = raise_privileges_permanently();

1885

if(errno != 0){

1886

perror_plus("Failed to raise privileges");

1887

_exit(EX_NOPERM);

1888

}

1889

/* Set group */

1890

errno = 0;

1891

ret = setgid(0);

1892

if(ret == -1){

1893

perror_plus("setgid");

1894

_exit(EX_NOPERM);

1895

}

1896

/* Reset supplementary groups */

1897

errno = 0;

1898

ret = setgroups(0, NULL);

1899

if(ret == -1){

1900

perror_plus("setgroups");

1901

_exit(EX_NOPERM);

1902

}

1903

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

1904

if(ret == -1){

1905

perror_plus("setenv");

1906

_exit(EX_OSERR);

1907

}

1908

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

1909

if(ret == -1){

1910

perror_plus("setenv");

1911

_exit(EX_OSERR);

1912

}

1913

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

1914

if(ret == -1){

1915

perror_plus("setenv");

1916

_exit(EX_OSERR);

1917

}

1918

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

1919

if(ret == -1){

1920

perror_plus("setenv");

1921

_exit(EX_OSERR);

1922

}

1923

char *delaystring;

1924

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

1925

if(ret == -1){

1396

} else {

1397

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

1398

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

1399

direntry = direntries[i];

1400

char *fullname = NULL;

1401

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

1402

if(ret < 0){

1926

1403

perror_plus("asprintf");

1927

_exit(EX_OSERR);

1928

}

1929

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

1930

if(ret == -1){

1404

continue;

1405

}

1406

if(debug){

1407

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

1408

direntry->d_name);

1409

}

1410

pid_t hook_pid = fork();

1411

if(hook_pid == 0){

1412

/* Child */

1413

/* Raise privileges */

1414

errno = 0;

1415

ret = seteuid(0);

1416

if(ret == -1){

1417

perror_plus("seteuid");

1418

}

1419

/* Raise privileges even more */

1420

errno = 0;

1421

ret = setuid(0);

1422

if(ret == -1){

1423

perror_plus("setuid");

1424

}

1425

/* Set group */

1426

errno = 0;

1427

ret = setgid(0);

1428

if(ret == -1){

1429

perror_plus("setgid");

1430

}

1431

/* Reset supplementary groups */

1432

errno = 0;

1433

ret = setgroups(0, NULL);

1434

if(ret == -1){

1435

perror_plus("setgroups");

1436

}

1437

dup2(devnull, STDIN_FILENO);

1438

close(devnull);

1439

dup2(STDERR_FILENO, STDOUT_FILENO);

1440

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

1441

if(ret == -1){

1442

perror_plus("setenv");

1443

_exit(EX_OSERR);

1444

}

1445

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

1446

if(ret == -1){

1447

perror_plus("setenv");

1448

_exit(EX_OSERR);

1449

}

1450

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

1451

if(ret == -1){

1452

perror_plus("setenv");

1453

_exit(EX_OSERR);

1454

}

1455

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

1456

if(ret == -1){

1457

perror_plus("setenv");

1458

_exit(EX_OSERR);

1459

}

1460

char *delaystring;

1461

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

1462

if(ret == -1){

1463

perror_plus("asprintf");

1464

_exit(EX_OSERR);

1465

}

1466

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

1467

if(ret == -1){

1468

free(delaystring);

1469

perror_plus("setenv");

1470

_exit(EX_OSERR);

1471

}

1931

1472

free(delaystring);

1932

perror_plus("setenv");

1933

_exit(EX_OSERR);

1934

}

1935

free(delaystring);

1936

if(connect_to != NULL){

1937

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

1938

if(ret == -1){

1939

perror_plus("setenv");

1940

_exit(EX_OSERR);

1941

}

1942

}

1943

int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,

1944

direntry->d_name,

1945

O_RDONLY));

1946

if(hook_fd == -1){

1947

perror_plus("openat");

1948

_exit(EXIT_FAILURE);

1949

}

1950

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

1951

perror_plus("close");

1952

_exit(EXIT_FAILURE);

1953

}

1954

ret = dup2(devnull, STDIN_FILENO);

1955

if(ret == -1){

1956

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

1957

_exit(EX_OSERR);

1958

}

1959

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

1960

if(ret == -1){

1961

perror_plus("close");

1962

_exit(EX_OSERR);

1963

}

1964

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1965

if(ret == -1){

1966

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

1967

_exit(EX_OSERR);

1968

}

1969

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1970

environ) == -1){

1971

perror_plus("fexecve");

1972

_exit(EXIT_FAILURE);

1973

}

1974

} else {

1975

if(hook_pid == -1){

1976

perror_plus("fork");

1977

free(direntry);

1978

continue;

1979

}

1980

int status;

1981

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

1982

perror_plus("waitpid");

1983

free(direntry);

1984

continue;

1985

}

1986

if(WIFEXITED(status)){

1987

if(WEXITSTATUS(status) != 0){

1988

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

1989

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

1990

WEXITSTATUS(status));

1991

free(direntry);

1992

continue;

1993

}

1994

} else if(WIFSIGNALED(status)){

1995

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

1996

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

1997

WTERMSIG(status));

1998

free(direntry);

1999

continue;

2000

} else {

2001

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

2002

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

2003

free(direntry);

2004

continue;

2005

}

2006

}

2007

if(debug){

2008

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

2009

direntry->d_name);

2010

}

2011

free(direntry);

2012

}

2013

free(direntries);

2014

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

2015

perror_plus("close");

2016

} else {

2017

hookdir_fd = -1;

2018

}

2019

close(devnull);

2020

}

2021

2022

__attribute__((nonnull, warn_unused_result))

2023

error_t bring_up_interface(const char *const interface,

2024

const float delay){

2025

error_t old_errno = errno;

2026

int ret;

2027

struct ifreq network;

2028

unsigned int if_index = if_nametoindex(interface);

2029

if(if_index == 0){

2030

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

2031

errno = old_errno;

2032

return ENXIO;

2033

}

2034

2035

if(quit_now){

2036

errno = old_errno;

2037

return EINTR;

2038

}

2039

2040

if(not interface_is_up(interface)){

2041

error_t ret_errno = 0, ioctl_errno = 0;

2042

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

2043

ret_errno = errno;

2044

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

2045

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

2046

errno = old_errno;

2047

return ret_errno;

2048

}

2049

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

2050

2051

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

2052

if(sd == -1){

2053

ret_errno = errno;

2054

perror_plus("socket");

2055

errno = old_errno;

2056

return ret_errno;

2057

}

2058

2059

if(quit_now){

2060

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

2061

if(ret == -1){

2062

perror_plus("close");

2063

}

2064

errno = old_errno;

2065

return EINTR;

2066

}

2067

2068

if(debug){

2069

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

2070

interface);

2071

}

2072

2073

/* Raise privileges */

2074

ret_errno = raise_privileges();

2075

if(ret_errno != 0){

2076

errno = ret_errno;

2077

perror_plus("Failed to raise privileges");

2078

}

2079

2080

#ifdef __linux__

2081

int ret_linux;

2082

bool restore_loglevel = false;

2083

if(ret_errno == 0){

2084

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

2085

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

2086

ret_linux = klogctl(8, NULL, 5);

2087

if(ret_linux == -1){

2088

perror_plus("klogctl");

2089

} else {

2090

restore_loglevel = true;

2091

}

2092

}

2093

#endif /* __linux__ */

2094

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

2095

ioctl_errno = errno;

2096

#ifdef __linux__

2097

if(restore_loglevel){

2098

ret_linux = klogctl(7, NULL, 0);

2099

if(ret_linux == -1){

2100

perror_plus("klogctl");

2101

}

2102

}

2103

#endif /* __linux__ */

2104

2105

/* If raise_privileges() succeeded above */

2106

if(ret_errno == 0){

2107

/* Lower privileges */

2108

ret_errno = lower_privileges();

2109

if(ret_errno != 0){

2110

errno = ret_errno;

2111

perror_plus("Failed to lower privileges");

2112

}

2113

}

2114

2115

/* Close the socket */

2116

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

2117

if(ret == -1){

2118

perror_plus("close");

2119

}

2120

2121

if(ret_setflags == -1){

2122

errno = ioctl_errno;

2123

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

2124

errno = old_errno;

2125

return ioctl_errno;

2126

}

2127

} else if(debug){

2128

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

2129

interface);

2130

}

2131

2132

/* Sleep checking until interface is running.

2133

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

2134

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

2135

if(interface_is_running(interface)){

2136

break;

2137

}

2138

struct timespec sleeptime = { .tv_nsec = 250000000 };

2139

ret = nanosleep(&sleeptime, NULL);

2140

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

2141

perror_plus("nanosleep");

2142

}

2143

}

2144

2145

errno = old_errno;

2146

return 0;

2147

}

2148

2149

__attribute__((nonnull, warn_unused_result))

2150

error_t take_down_interface(const char *const interface){

2151

error_t old_errno = errno;

2152

struct ifreq network;

2153

unsigned int if_index = if_nametoindex(interface);

2154

if(if_index == 0){

2155

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

2156

errno = old_errno;

2157

return ENXIO;

2158

}

2159

if(interface_is_up(interface)){

2160

error_t ret_errno = 0, ioctl_errno = 0;

2161

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

2162

ret_errno = errno;

2163

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

2164

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

2165

errno = old_errno;

2166

return ret_errno;

2167

}

2168

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

2169

2170

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

2171

if(sd == -1){

2172

ret_errno = errno;

2173

perror_plus("socket");

2174

errno = old_errno;

2175

return ret_errno;

2176

}

2177

2178

if(debug){

2179

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

2180

interface);

2181

}

2182

2183

/* Raise privileges */

2184

ret_errno = raise_privileges();

2185

if(ret_errno != 0){

2186

errno = ret_errno;

2187

perror_plus("Failed to raise privileges");

2188

}

2189

2190

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

2191

ioctl_errno = errno;

2192

2193

/* If raise_privileges() succeeded above */

2194

if(ret_errno == 0){

2195

/* Lower privileges */

2196

ret_errno = lower_privileges();

2197

if(ret_errno != 0){

2198

errno = ret_errno;

2199

perror_plus("Failed to lower privileges");

2200

}

2201

}

2202

2203

/* Close the socket */

2204

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

2205

if(ret == -1){

2206

perror_plus("close");

2207

}

2208

2209

if(ret_setflags == -1){

2210

errno = ioctl_errno;

2211

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2212

errno = old_errno;

2213

return ioctl_errno;

2214

}

2215

} else if(debug){

2216

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

2217

interface);

2218

}

2219

2220

errno = old_errno;

2221

return 0;

1473

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

1474

perror_plus("execl");

1475

} else {

1476

int status;

1477

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

1478

perror_plus("waitpid");

1479

free(fullname);

1480

continue;

1481

}

1482

if(WIFEXITED(status)){

1483

if(WEXITSTATUS(status) != 0){

1484

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

1485

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

1486

WEXITSTATUS(status));

1487

free(fullname);

1488

continue;

1489

}

1490

} else if(WIFSIGNALED(status)){

1491

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

1492

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

1493

WTERMSIG(status));

1494

free(fullname);

1495

continue;

1496

} else {

1497

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

1498

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

1499

free(fullname);

1500

continue;

1501

}

1502

}

1503

free(fullname);

1504

if(debug){

1505

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

1506

direntry->d_name);

1507

}

1508

}

1509

close(devnull);

1510

}

1511

return true;

2222

1512

}

2223

1513

2224

1514

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

2225

mandos_context mc = { .server = NULL, .dh_bits = 0,

2226

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

2227

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

2228

.interfaces = NULL, .interfaces_size = 0 };

2229

1515

AvahiSServiceBrowser *sb = NULL;

2230

error_t ret_errno;

1516

int error;

2231

1517

int ret;

2232

1518

intmax_t tmpmax;

2233

1519

char *tmp;

2234

1520

int exitcode = EXIT_SUCCESS;

2235

char *interfaces_to_take_down = NULL;

2236

size_t interfaces_to_take_down_size = 0;

2237

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

2238

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

2239

char *tempdir = NULL;

1521

const char *interface = "";

1522

struct ifreq network;

1523

int sd = -1;

1524

bool take_down_interface = false;

1525

uid_t uid;

1526

gid_t gid;

1527

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

1528

bool tempdir_created = false;

2240

1529

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2241

1530

const char *seckey = PATHDIR "/" SECKEY;

2242

1531

const char *pubkey = PATHDIR "/" PUBKEY;

2243

char *interfaces_hooks = NULL;

2244

1532

2245

1533

bool gnutls_initialized = false;

2246

1534

bool gpgme_initialized = false;

2308

1596

.group = 2 },

2309

1597

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

2310

1598

.arg = "SECONDS",

2311

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

1599

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

2312

1600

.group = 2 },

2313

1601

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

2314

1602

.arg = "DIR",

2337

1625

connect_to = arg;

2338

1626

break;

2339

1627

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

2340

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

2341

arg, (int)',');

2342

if(ret_errno != 0){

2343

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

2344

}

1628

interface = arg;

2345

1629

break;

2346

1630

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

2347

1631

seckey = arg;

2419

1703

goto end;

2420

1704

}

2421

1705

}

2422

1706

2423

1707

{

2424

1708

/* Work around Debian bug #633582:

2425

1709

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

2426

1710

2427

/* Re-raise privileges */

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2431

perror_plus("Failed to raise privileges");

1711

/* Re-raise priviliges */

1712

errno = 0;

1713

ret = seteuid(0);

1714

if(ret == -1){

1715

perror_plus("seteuid");

2432

1716

} else {

2433

1717

struct stat st;

2434

1718

2452

1736

TEMP_FAILURE_RETRY(close(seckey_fd));

2453

1737

}

2454

1738

}

2455

1739

2456

1740

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

2457

1741

int pubkey_fd = open(pubkey, O_RDONLY);

2458

1742

if(pubkey_fd == -1){

2473

1757

TEMP_FAILURE_RETRY(close(pubkey_fd));

2474

1758

}

2475

1759

}

2476

1760

2477

1761

/* Lower privileges */

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2481

perror_plus("Failed to lower privileges");

2482

}

2483

}

2484

}

2485

2486

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

2487

{

2488

char *interface = NULL;

2489

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

2490

interface))){

2491

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

2492

and if_nametoindex(interface) == 0){

2493

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

2494

fprintf_plus(stderr, "Not using nonexisting interface"

2495

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

2496

}

2497

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

2498

interface = NULL;

1762

errno = 0;

1763

ret = seteuid(uid);

1764

if(ret == -1){

1765

perror_plus("seteuid");

2499

1766

}

2500

1767

}

2501

1768

}

2502

1769

2503

1770

/* Run network hooks */

2504

{

2505

if(mc.interfaces != NULL){

2506

interfaces_hooks = malloc(mc.interfaces_size);

2507

if(interfaces_hooks == NULL){

2508

perror_plus("malloc");

2509

goto end;

2510

}

2511

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

2512

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

2513

}

2514

run_network_hooks("start", interfaces_hooks != NULL ?

2515

interfaces_hooks : "", delay);

1771

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

1772

goto end;

2516

1773

}

2517

1774

2518

1775

if(not debug){

2519

1776

avahi_set_log_function(empty_log);

2520

1777

}

2521

1778

1779

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

1780

struct dirent **direntries;

1781

/* First look for interfaces that are up */

1782

ret = scandir(sys_class_net, &direntries, up_interface,

1783

alphasort);

1784

if(ret == 0){

1785

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

1786

free(direntries);

1787

ret = scandir(sys_class_net, &direntries, good_interface,

1788

alphasort);

1789

}

1790

if(ret >= 1){

1791

/* Pick the first interface returned */

1792

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

1793

if(debug){

1794

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

1795

}

1796

if(interface == NULL){

1797

perror_plus("malloc");

1798

free(direntries);

1799

exitcode = EXIT_FAILURE;

1800

goto end;

1801

}

1802

free(direntries);

1803

} else {

1804

free(direntries);

1805

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

1806

exitcode = EXIT_FAILURE;

1807

goto end;

1808

}

1809

}

1810

2522

1811

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

2523

1812

from the signal handler */

2524

1813

/* Initialize the pseudo-RNG for Avahi */

2525

1814

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

2526

simple_poll = avahi_simple_poll_new();

2527

if(simple_poll == NULL){

1815

mc.simple_poll = avahi_simple_poll_new();

1816

if(mc.simple_poll == NULL){

2528

1817

fprintf_plus(stderr,

2529

1818

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

2530

1819

exitcode = EX_UNAVAILABLE;

2594

1883

}

2595

1884

}

2596

1885

2597

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

2598

if(mc.interfaces == NULL){

2599

struct dirent **direntries = NULL;

2600

/* Look for any good interfaces */

2601

ret = scandir(sys_class_net, &direntries, good_interface,

2602

alphasort);

2603

if(ret >= 1){

2604

/* Add all found interfaces to interfaces list */

2605

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

2606

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

2607

direntries[i]->d_name);

2608

if(ret_errno != 0){

2609

errno = ret_errno;

2610

perror_plus("argz_add");

2611

free(direntries[i]);

2612

continue;

2613

}

2614

if(debug){

2615

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

2616

direntries[i]->d_name);

2617

}

2618

free(direntries[i]);

2619

}

2620

free(direntries);

2621

} else {

2622

if(ret == 0){

2623

free(direntries);

2624

}

2625

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

2626

exitcode = EXIT_FAILURE;

2627

goto end;

2628

}

2629

}

2630

2631

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

2632

{

2633

char *interface = NULL;

2634

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

2635

interface))){

2636

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

2637

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

2638

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

2639

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

2640

interface);

2641

interface = NULL;

2642

while((interface = argz_next(mc.interfaces,

2643

mc.interfaces_size, interface))){

2644

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

2645

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

2646

interface);

2647

interface = NULL;

1886

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

1887

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

1888

if_index = (AvahiIfIndex) if_nametoindex(interface);

1889

if(if_index == 0){

1890

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

1891

exitcode = EX_UNAVAILABLE;

1892

goto end;

1893

}

1894

1895

if(quit_now){

1896

goto end;

1897

}

1898

1899

/* Re-raise priviliges */

1900

errno = 0;

1901

ret = seteuid(0);

1902

if(ret == -1){

1903

perror_plus("seteuid");

1904

}

1905

1906

#ifdef __linux__

1907

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1908

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

1909

ret = klogctl(8, NULL, 5);

1910

bool restore_loglevel = true;

1911

if(ret == -1){

1912

restore_loglevel = false;

1913

perror_plus("klogctl");

1914

}

1915

#endif /* __linux__ */

1916

1917

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1918

if(sd < 0){

1919

perror_plus("socket");

1920

exitcode = EX_OSERR;

1921

#ifdef __linux__

1922

if(restore_loglevel){

1923

ret = klogctl(7, NULL, 0);

1924

if(ret == -1){

1925

perror_plus("klogctl");

1926

}

1927

}

1928

#endif /* __linux__ */

1929

/* Lower privileges */

1930

errno = 0;

1931

ret = seteuid(uid);

1932

if(ret == -1){

1933

perror_plus("seteuid");

1934

}

1935

goto end;

1936

}

1937

strcpy(network.ifr_name, interface);

1938

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

1939

if(ret == -1){

1940

perror_plus("ioctl SIOCGIFFLAGS");

1941

#ifdef __linux__

1942

if(restore_loglevel){

1943

ret = klogctl(7, NULL, 0);

1944

if(ret == -1){

1945

perror_plus("klogctl");

1946

}

1947

}

1948

#endif /* __linux__ */

1949

exitcode = EX_OSERR;

1950

/* Lower privileges */

1951

errno = 0;

1952

ret = seteuid(uid);

1953

if(ret == -1){

1954

perror_plus("seteuid");

1955

}

1956

goto end;

1957

}

1958

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

1959

network.ifr_flags |= IFF_UP;

1960

take_down_interface = true;

1961

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

1962

if(ret == -1){

1963

take_down_interface = false;

1964

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1965

exitcode = EX_OSERR;

1966

#ifdef __linux__

1967

if(restore_loglevel){

1968

ret = klogctl(7, NULL, 0);

1969

if(ret == -1){

1970

perror_plus("klogctl");

2648

1971

}

2649

1972

}

1973

#endif /* __linux__ */

1974

/* Lower privileges */

1975

errno = 0;

1976

ret = seteuid(uid);

1977

if(ret == -1){

1978

perror_plus("seteuid");

1979

}

1980

goto end;

1981

}

1982

}

1983

/* Sleep checking until interface is running.

1984

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

1985

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

1986

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

1987

if(ret == -1){

1988

perror_plus("ioctl SIOCGIFFLAGS");

1989

} else if(network.ifr_flags & IFF_RUNNING){

2650

1990

break;

2651

1991

}

2652

bool interface_was_up = interface_is_up(interface);

2653

errno = bring_up_interface(interface, delay);

2654

if(not interface_was_up){

2655

if(errno != 0){

2656

perror_plus("Failed to bring up interface");

2657

} else {

2658

errno = argz_add(&interfaces_to_take_down,

2659

&interfaces_to_take_down_size,

2660

interface);

2661

if(errno != 0){

2662

perror_plus("argz_add");

2663

}

2664

}

2665

}

2666

}

2667

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

2668

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

2669

}

2670

}

2671

2672

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

2673

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

2674

if(debug){

2675

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

2676

mc.interfaces);

2677

}

2678

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

1992

struct timespec sleeptime = { .tv_nsec = 250000000 };

1993

ret = nanosleep(&sleeptime, NULL);

1994

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

1995

perror_plus("nanosleep");

1996

}

1997

}

1998

if(not take_down_interface){

1999

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

2000

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

2001

if(ret == -1){

2002

perror_plus("close");

2003

}

2004

}

2005

#ifdef __linux__

2006

if(restore_loglevel){

2007

/* Restores kernel loglevel to default */

2008

ret = klogctl(7, NULL, 0);

2009

if(ret == -1){

2010

perror_plus("klogctl");

2011

}

2012

}

2013

#endif /* __linux__ */

2014

/* Lower privileges */

2015

errno = 0;

2016

/* Lower privileges */

2017

ret = seteuid(uid);

2018

if(ret == -1){

2019

perror_plus("seteuid");

2020

}

2679

2021

}

2680

2022

2681

2023

if(quit_now){

2682

2024

goto end;

2683

2025

}

2684

2026

2685

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

2027

ret = init_gnutls_global(pubkey, seckey);

2686

2028

if(ret == -1){

2687

2029

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

2688

2030

exitcode = EX_UNAVAILABLE;

2695

2037

goto end;

2696

2038

}

2697

2039

2698

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

2699

tempdir = mkdtemp(run_tempdir);

2700

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

2701

if(debug){

2702

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

2703

run_tempdir, old_tempdir);

2704

}

2705

tempdir = mkdtemp(old_tempdir);

2706

}

2707

if(tempdir == NULL){

2040

if(mkdtemp(tempdir) == NULL){

2708

2041

perror_plus("mkdtemp");

2709

2042

goto end;

2710

2043

}

2044

tempdir_created = true;

2711

2045

2712

2046

if(quit_now){

2713

2047

goto end;

2714

2048

}

2715

2049

2716

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

2050

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

2717

2051

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

2718

2052

exitcode = EX_UNAVAILABLE;

2719

2053

goto end;

2729

2063

/* Connect directly, do not use Zeroconf */

2730

2064

/* (Mainly meant for debugging) */

2731

2065

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

2732

2733

2066

if(address == NULL){

2734

2067

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

2735

2068

exitcode = EX_USAGE;

2740

2073

goto end;

2741

2074

}

2742

2075

2743

in_port_t port;

2076

uint16_t port;

2744

2077

errno = 0;

2745

2078

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

2746

2079

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

2747

or tmpmax != (in_port_t)tmpmax){

2080

or tmpmax != (uint16_t)tmpmax){

2748

2081

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

2749

2082

exitcode = EX_USAGE;

2750

2083

goto end;

2751

2084

}

2752

2085

2753

2086

if(quit_now){

2754

2087

goto end;

2755

2088

}

2756

2089

2757

port = (in_port_t)tmpmax;

2090

port = (uint16_t)tmpmax;

2758

2091

*address = '\0';

2759

2092

/* Colon in address indicates IPv6 */

2760

2093

int af;

2776

2109

}

2777

2110

2778

2111

while(not quit_now){

2779

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

2780

&mc);

2112

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

2781

2113

if(quit_now or ret == 0){

2782

2114

break;

2783

2115

}

2785

2117

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

2786

2118

(int)retry_interval);

2787

2119

}

2788

sleep((unsigned int)retry_interval);

2120

sleep((int)retry_interval);

2789

2121

}

2790

2122

2791

if(not quit_now){

2123

if (not quit_now){

2792

2124

exitcode = EXIT_SUCCESS;

2793

2125

}

2794

2126

2809

2141

config.publish_domain = 0;

2810

2142

2811

2143

/* Allocate a new server */

2812

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2813

&config, NULL, NULL, &ret_errno);

2144

mc.server = avahi_server_new(avahi_simple_poll_get

2145

(mc.simple_poll), &config, NULL,

2146

NULL, &error);

2814

2147

2815

2148

/* Free the Avahi configuration data */

2816

2149

avahi_server_config_free(&config);

2819

2152

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

2820

2153

if(mc.server == NULL){

2821

2154

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

2822

avahi_strerror(ret_errno));

2155

avahi_strerror(error));

2823

2156

exitcode = EX_UNAVAILABLE;

2824

2157

goto end;

2825

2158

}

2831

2164

/* Create the Avahi service browser */

2832

2165

sb = avahi_s_service_browser_new(mc.server, if_index,

2833

2166

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2834

NULL, 0, browse_callback,

2835

(void *)&mc);

2167

NULL, 0, browse_callback, NULL);

2836

2168

if(sb == NULL){

2837

2169

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

2838

2170

avahi_strerror(avahi_server_errno(mc.server)));

2849

2181

if(debug){

2850

2182

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

2851

2183

}

2852

2853

ret = avahi_loop_with_timeout(simple_poll,

2854

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

2184

2185

ret = avahi_loop_with_timeout(mc.simple_poll,

2186

(int)(retry_interval * 1000));

2855

2187

if(debug){

2856

2188

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

2857

2189

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

2864

2196

}

2865

2197

2866

2198

/* Cleanup things */

2867

free(mc.interfaces);

2868

2869

2199

if(sb != NULL)

2870

2200

avahi_s_service_browser_free(sb);

2871

2201

2872

2202

if(mc.server != NULL)

2873

2203

avahi_server_free(mc.server);

2874

2204

2875

if(simple_poll != NULL)

2876

avahi_simple_poll_free(simple_poll);

2205

if(mc.simple_poll != NULL)

2206

avahi_simple_poll_free(mc.simple_poll);

2877

2207

2878

2208

if(gnutls_initialized){

2879

2209

gnutls_certificate_free_credentials(mc.cred);

2891

2221

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

2892

2222

while(mc.current_server != NULL){

2893

2223

server *next = mc.current_server->next;

2894

#ifdef __GNUC__

2895

#pragma GCC diagnostic push

2896

#pragma GCC diagnostic ignored "-Wcast-qual"

2897

#endif

2898

free((char *)(mc.current_server->ip));

2899

#ifdef __GNUC__

2900

#pragma GCC diagnostic pop

2901

#endif

2902

2224

free(mc.current_server);

2903

2225

mc.current_server = next;

2904

2226

}

2905

2227

}

2906

2228

2907

/* Re-raise privileges */

2229

/* Run network hooks */

2230

run_network_hooks("stop", interface, delay);

2231

2232

/* Re-raise priviliges */

2908

2233

{

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

2912

perror_plus("Failed to raise privileges");

2913

} else {

2914

2915

/* Run network hooks */

2916

run_network_hooks("stop", interfaces_hooks != NULL ?

2917

interfaces_hooks : "", delay);

2918

2919

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

2920

{

2921

char *interface = NULL;

2922

while((interface=argz_next(interfaces_to_take_down,

2923

interfaces_to_take_down_size,

2924

interface))){

2925

ret_errno = take_down_interface(interface);

2926

if(ret_errno != 0){

2927

errno = ret_errno;

2928

perror_plus("Failed to take down interface");

2929

}

2930

}

2931

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

2932

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

2933

" down\n");

2934

}

2935

}

2234

errno = 0;

2235

ret = seteuid(0);

2236

if(ret == -1){

2237

perror_plus("seteuid");

2936

2238

}

2937

2239

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

2941

perror_plus("Failed to lower privileges permanently");

2240

/* Take down the network interface */

2241

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

2242

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

2243

if(ret == -1){

2244

perror_plus("ioctl SIOCGIFFLAGS");

2245

} else if(network.ifr_flags & IFF_UP){

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2250

}

2251

}

2252

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

2253

if(ret == -1){

2254

perror_plus("close");

2255

}

2942

2256

}

2943

2257

}

2944

2945

free(interfaces_to_take_down);

2946

free(interfaces_hooks);

2258

/* Lower privileges permanently */

2259

errno = 0;

2260

ret = setuid(uid);

2261

if(ret == -1){

2262

perror_plus("setuid");

2263

}

2947

2264

2948

2265

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

2949

if(tempdir != NULL){

2266

if(tempdir_created){

2950

2267

struct dirent **direntries = NULL;

2951

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY

2952

| O_NOFOLLOW

2953

| O_DIRECTORY

2954

| O_PATH));

2955

if(tempdir_fd == -1){

2956

perror_plus("open");

2957

} else {

2958

#ifdef __GLIBC__

2959

#if __GLIBC_PREREQ(2, 15)

2960

int numentries = scandirat(tempdir_fd, ".", &direntries,

2961

notdotentries, alphasort);

2962

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

2963

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

2964

alphasort);

2965

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

2966

#else /* not __GLIBC__ */

2967

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

2968

alphasort);

2969

#endif /* not __GLIBC__ */

2970

if(numentries >= 0){

2971

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

2972

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2973

if(ret == -1){

2974

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2975

" \"%s\", 0): %s\n", tempdir,

2976

direntries[i]->d_name, strerror(errno));

2977

}

2978

free(direntries[i]);

2979

}

2980

2981

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

2982

free(direntries);

2983

if(numentries == -1){

2984

perror_plus("scandir");

2985

}

2986

ret = rmdir(tempdir);

2987

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

2988

perror_plus("rmdir");

2989

}

2268

struct dirent *direntry = NULL;

2269

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

2270

alphasort);

2271

if (numentries > 0){

2272

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

2273

direntry = direntries[i];

2274

char *fullname = NULL;

2275

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

2276

direntry->d_name);

2277

if(ret < 0){

2278

perror_plus("asprintf");

2279

continue;

2280

}

2281

ret = remove(fullname);

2282

if(ret == -1){

2283

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2284

strerror(errno));

2285

}

2286

free(fullname);

2990

2287

}

2991

TEMP_FAILURE_RETRY(close(tempdir_fd));

2288

}

2289

2290

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

2291

free(direntries);

2292

if (numentries == -1){

2293

perror_plus("scandir");

2294

}

2295

ret = rmdir(tempdir);

2296

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

2297

perror_plus("rmdir");

2992

2298

}

2993

2299

}

2994

2300