/mandos/trunk : revision 744

9

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

10

*

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* 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

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#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

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#define _FILE_OFFSET_BITS 64

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#endif

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#endif /* not _FILE_OFFSET_BITS */

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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(), remove() */

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stdout, ferror() */

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

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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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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() */

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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() */

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*/

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

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

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unlinkat() */

78

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

78

79

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

79

80

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

80

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argp_state, struct argp,

92

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argz_delete(), argz_append(),

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94

argz_stringify(), argz_add(),

94

95

argz_count() */

96

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

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EAI_SYSTEM, gai_strerror() */

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98

96

99

#ifdef __linux__

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100

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

139

142

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

140

143

char *connect_to = NULL;

141

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

142

146

uid_t uid = 65534;

143

147

gid_t gid = 65534;

144

148

145

149

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

146

150

typedef struct server{

147

151

const char *ip;

148

uint16_t port;

152

in_port_t port;

149

153

AvahiIfIndex if_index;

150

154

int af;

151

155

struct timespec last_seen;

155

159

156

160

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

157

161

typedef struct {

158

AvahiSimplePoll *simple_poll;

159

162

AvahiServer *server;

160

163

gnutls_certificate_credentials_t cred;

161

164

unsigned int dh_bits;

163

166

const char *priority;

164

167

gpgme_ctx_t ctx;

165

168

server *current_server;

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char *interfaces;

170

size_t interfaces_size;

166

171

} mandos_context;

167

172

168

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

169

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

170

.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

173

175

174

176

sig_atomic_t quit_now = 0;

175

177

int signal_received = 0;

183

185

perror(print_text);

184

186

}

185

187

186

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

188

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

187

189

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

188

190

va_list ap;

189

191

va_start (ap, format);

190

192

191

193

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

192

194

program_invocation_short_name));

193

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

195

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

194

196

}

195

197

196

198

/*

198

200

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

199

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* "buffer_length" is how much is already used.

200

202

*/

203

__attribute__((nonnull, warn_unused_result))

201

204

size_t incbuffer(char **buffer, size_t buffer_length,

202

205

size_t buffer_capacity){

203

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

204

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

205

if(buffer == NULL){

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;

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213

return 0;

207

214

}

215

*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

209

217

}

210

218

return buffer_capacity;

211

219

}

212

220

213

221

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

214

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

215

int af){

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){

216

225

int ret;

217

226

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

218

227

if(new_server == NULL){

225

234

.af = af };

226

235

if(new_server->ip == NULL){

227

236

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);

228

252

return false;

229

253

}

230

254

/* Special case of first server */

231

if (mc.current_server == NULL){

255

if(*current_server == NULL){

232

256

new_server->next = new_server;

233

257

new_server->prev = new_server;

234

mc.current_server = new_server;

235

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

258

*current_server = new_server;

236

259

} else {

237

new_server->next = mc.current_server;

238

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

260

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

261

new_server->next = *current_server;

262

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

239

263

new_server->prev->next = new_server;

240

mc.current_server->prev = new_server;

241

}

242

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

243

if(ret == -1){

244

perror_plus("clock_gettime");

245

return false;

264

(*current_server)->prev = new_server;

246

265

}

247

266

return true;

248

267

}

250

269

/*

251

270

* Initialize GPGME.

252

271

*/

253

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

254

const char *tempdir){

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){

255

277

gpgme_error_t rc;

256

278

gpgme_engine_info_t engine_info;

257

279

258

259

280

/*

260

281

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

261

282

*/

262

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

263

284

int ret;

264

285

int fd;

265

286

gpgme_data_t pgp_data;

277

298

return false;

278

299

}

279

300

280

rc = gpgme_op_import(mc.ctx, pgp_data);

301

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

281

302

if(rc != GPG_ERR_NO_ERROR){

282

303

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

283

304

gpgme_strsource(rc), gpgme_strerror(rc));

327

348

}

328

349

329

350

/* Create new GPGME "context" */

330

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

351

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

331

352

if(rc != GPG_ERR_NO_ERROR){

332

353

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

333

354

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

346

367

* Decrypt OpenPGP data.

347

368

* Returns -1 on error

348

369

*/

370

__attribute__((nonnull, warn_unused_result))

349

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

350

372

size_t crypto_size,

351

char **plaintext){

373

char **plaintext,

374

mandos_context *mc){

352

375

gpgme_data_t dh_crypto, dh_plain;

353

376

gpgme_error_t rc;

354

377

ssize_t ret;

380

403

381

404

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

382

405

data buffer */

383

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

406

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

384

407

if(rc != GPG_ERR_NO_ERROR){

385

408

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

386

409

gpgme_strsource(rc), gpgme_strerror(rc));

387

410

plaintext_length = -1;

388

411

if(debug){

389

412

gpgme_decrypt_result_t result;

390

result = gpgme_op_decrypt_result(mc.ctx);

413

result = gpgme_op_decrypt_result(mc->ctx);

391

414

if(result == NULL){

392

415

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

393

416

} else {

470

493

return plaintext_length;

471

494

}

472

495

473

static const char * safer_gnutls_strerror(int value){

474

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

475

-Wunreachable-code */

476

if(ret == NULL)

477

ret = "(unknown)";

478

return ret;

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);

479

507

}

480

508

481

509

/* GnuTLS log function callback */

510

__attribute__((nonnull))

482

511

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

483

512

const char* string){

484

513

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

485

514

}

486

515

516

__attribute__((nonnull, warn_unused_result))

487

517

static int init_gnutls_global(const char *pubkeyfilename,

488

const char *seckeyfilename){

518

const char *seckeyfilename,

519

mandos_context *mc){

489

520

int ret;

521

unsigned int uret;

490

522

491

523

if(debug){

492

524

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

508

540

}

509

541

510

542

/* OpenPGP credentials */

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

543

ret = gnutls_certificate_allocate_credentials(&mc->cred);

512

544

if(ret != GNUTLS_E_SUCCESS){

513

545

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

514

546

safer_gnutls_strerror(ret));

524

556

}

525

557

526

558

ret = gnutls_certificate_set_openpgp_key_file

527

(mc.cred, pubkeyfilename, seckeyfilename,

559

(mc->cred, pubkeyfilename, seckeyfilename,

528

560

GNUTLS_OPENPGP_FMT_BASE64);

529

561

if(ret != GNUTLS_E_SUCCESS){

530

562

fprintf_plus(stderr,

536

568

}

537

569

538

570

/* GnuTLS server initialization */

539

ret = gnutls_dh_params_init(&mc.dh_params);

571

ret = gnutls_dh_params_init(&mc->dh_params);

540

572

if(ret != GNUTLS_E_SUCCESS){

541

573

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

542

574

" initialization: %s\n",

543

575

safer_gnutls_strerror(ret));

544

576

goto globalfail;

545

577

}

546

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

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);

547

680

if(ret != GNUTLS_E_SUCCESS){

548

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

549

safer_gnutls_strerror(ret));

681

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

682

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

550

683

goto globalfail;

551

684

}

552

685

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

686

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

554

687

555

688

return 0;

556

689

557

690

globalfail:

558

691

559

gnutls_certificate_free_credentials(mc.cred);

692

gnutls_certificate_free_credentials(mc->cred);

560

693

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

694

gnutls_dh_params_deinit(mc->dh_params);

562

695

return -1;

563

696

}

564

697

565

static int init_gnutls_session(gnutls_session_t *session){

698

__attribute__((nonnull, warn_unused_result))

699

static int init_gnutls_session(gnutls_session_t *session,

700

mandos_context *mc){

566

701

int ret;

567

702

/* GnuTLS session creation */

568

703

do {

580

715

{

581

716

const char *err;

582

717

do {

583

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

718

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

584

719

if(quit_now){

585

720

gnutls_deinit(*session);

586

721

return -1;

597

732

598

733

do {

599

734

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

600

mc.cred);

735

mc->cred);

601

736

if(quit_now){

602

737

gnutls_deinit(*session);

603

738

return -1;

613

748

/* ignore client certificate if any. */

614

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

615

750

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

617

752

618

753

return 0;

619

754

}

623

758

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

624

759

625

760

/* Called when a Mandos server is found */

626

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

761

__attribute__((nonnull, warn_unused_result))

762

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

627

763

AvahiIfIndex if_index,

628

int af){

764

int af, mandos_context *mc){

629

765

int ret, tcp_sd = -1;

630

766

ssize_t sret;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

767

struct sockaddr_storage to;

635

768

char *buffer = NULL;

636

769

char *decrypted_buffer = NULL;

637

770

size_t buffer_length = 0;

661

794

return -1;

662

795

}

663

796

664

ret = init_gnutls_session(&session);

797

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

798

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

799

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

800

bool match = false;

801

{

802

char *interface = NULL;

803

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

804

interface))){

805

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

806

match = true;

807

break;

808

}

809

}

810

}

811

if(not match){

812

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

813

connect to the server */

814

if(debug){

815

char interface[IF_NAMESIZE];

816

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

817

perror_plus("if_indextoname");

818

} else {

819

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

820

" \"%s\"\n",

821

if_indextoname((unsigned int)if_index,

822

interface));

823

}

824

}

825

return -1;

826

}

827

}

828

829

ret = init_gnutls_session(&session, mc);

665

830

if(ret != 0){

666

831

return -1;

667

832

}

668

833

669

834

if(debug){

670

835

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

671

PRIu16 "\n", ip, port);

836

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

672

837

}

673

838

674

839

tcp_sd = socket(pf, SOCK_STREAM, 0);

686

851

687

852

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

688

853

if(af == AF_INET6){

689

to.in6.sin6_family = (sa_family_t)af;

690

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

854

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

855

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

691

856

} else { /* IPv4 */

692

to.in.sin_family = (sa_family_t)af;

693

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

857

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

858

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

694

859

}

695

860

if(ret < 0 ){

696

861

int e = errno;

705

870

goto mandos_end;

706

871

}

707

872

if(af == AF_INET6){

708

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

709

-Wconversion and

710

-Wunreachable-code */

711

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

713

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

714

-Wunreachable-code*/

873

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

874

if(IN6_IS_ADDR_LINKLOCAL

875

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

715

876

if(if_index == AVAHI_IF_UNSPEC){

716

877

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

717

878

" incomplete without a network interface\n");

719

880

goto mandos_end;

720

881

}

721

882

/* Set the network interface number as scope */

722

to.in6.sin6_scope_id = (uint32_t)if_index;

883

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

723

884

}

724

885

} else {

725

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

726

-Wconversion and

727

-Wunreachable-code */

886

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

728

887

}

729

888

730

889

if(quit_now){

738

897

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

739

898

perror_plus("if_indextoname");

740

899

} else {

741

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

742

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

900

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

901

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

743

902

}

744

903

} else {

745

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

746

ip, port);

904

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

905

ip, (uintmax_t)port);

747

906

}

748

907

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

749

908

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

const char *pcret;

751

909

if(af == AF_INET6){

752

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

753

sizeof(addrstr));

910

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

911

sizeof(struct sockaddr_in6),

912

addrstr, sizeof(addrstr), NULL, 0,

913

NI_NUMERICHOST);

754

914

} else {

755

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

756

sizeof(addrstr));

915

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

916

sizeof(struct sockaddr_in),

917

addrstr, sizeof(addrstr), NULL, 0,

918

NI_NUMERICHOST);

757

919

}

758

if(pcret == NULL){

759

perror_plus("inet_ntop");

760

} else {

761

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

762

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

763

}

920

if(ret == EAI_SYSTEM){

921

perror_plus("getnameinfo");

922

} else if(ret != 0) {

923

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

924

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

925

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

764

926

}

765

927

}

766

928

770

932

}

771

933

772

934

if(af == AF_INET6){

773

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

935

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

936

sizeof(struct sockaddr_in6));

774

937

} else {

775

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

938

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

939

sizeof(struct sockaddr_in));

776

940

}

777

941

if(ret < 0){

778

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

942

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

779

943

int e = errno;

780

944

perror_plus("connect");

781

945

errno = e;

942

1106

if(buffer_length > 0){

943

1107

ssize_t decrypted_buffer_size;

944

1108

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

945

&decrypted_buffer);

1109

&decrypted_buffer, mc);

946

1110

if(decrypted_buffer_size >= 0){

947

1111

948

1112

written = 0;

996

1160

return retval;

997

1161

}

998

1162

1163

__attribute__((nonnull))

999

1164

static void resolve_callback(AvahiSServiceResolver *r,

1000

1165

AvahiIfIndex interface,

1001

1166

AvahiProtocol proto,

1009

1174

AVAHI_GCC_UNUSED AvahiStringList *txt,

1010

1175

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1011

1176

flags,

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1177

void *mc){

1178

if(r == NULL){

1179

return;

1180

}

1014

1181

1015

1182

/* Called whenever a service has been resolved successfully or

1016

1183

timed out */

1017

1184

1018

1185

if(quit_now){

1186

avahi_s_service_resolver_free(r);

1019

1187

return;

1020

1188

}

1021

1189

1025

1193

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

1026

1194

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

1027

1195

domain,

1028

avahi_strerror(avahi_server_errno(mc.server)));

1196

avahi_strerror(avahi_server_errno

1197

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

1029

1198

break;

1030

1199

1031

1200

case AVAHI_RESOLVER_FOUND:

1037

1206

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

1038

1207

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

1039

1208

}

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1209

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

1210

interface,

1211

avahi_proto_to_af(proto),

1212

mc);

1042

1213

if(ret == 0){

1043

avahi_simple_poll_quit(mc.simple_poll);

1214

avahi_simple_poll_quit(simple_poll);

1044

1215

} else {

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1216

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

1217

avahi_proto_to_af(proto),

1218

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

1047

1219

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

1048

1220

" list\n", name);

1049

1221

}

1062

1234

const char *domain,

1063

1235

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1064

1236

flags,

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1237

void *mc){

1238

if(b == NULL){

1239

return;

1240

}

1067

1241

1068

1242

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

1069

1243

is removed from the LAN */

1077

1251

case AVAHI_BROWSER_FAILURE:

1078

1252

1079

1253

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1254

avahi_strerror(avahi_server_errno

1255

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

1256

avahi_simple_poll_quit(simple_poll);

1082

1257

return;

1083

1258

1084

1259

case AVAHI_BROWSER_NEW:

1087

1262

the callback function is called the Avahi server will free the

1088

1263

resolver for us. */

1089

1264

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1265

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

1266

interface, protocol, name, type,

1267

domain, protocol, 0,

1268

resolve_callback, mc) == NULL)

1093

1269

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

1094

1270

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1271

avahi_strerror(avahi_server_errno

1272

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

1096

1273

break;

1097

1274

1098

1275

case AVAHI_BROWSER_REMOVE:

1117

1294

signal_received = sig;

1118

1295

int old_errno = errno;

1119

1296

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1297

if(simple_poll != NULL){

1298

avahi_simple_poll_quit(simple_poll);

1122

1299

}

1123

1300

errno = old_errno;

1124

1301

}

1125

1302

1303

__attribute__((nonnull, warn_unused_result))

1126

1304

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

1127

1305

int ret;

1128

1306

error_t ret_errno;

1147

1325

return true;

1148

1326

}

1149

1327

1328

__attribute__((nonnull, warn_unused_result))

1150

1329

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

1151

1330

1152

1331

/* Reject the loopback device */

1194

1373

* corresponds to an acceptable network device.

1195

1374

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

1196

1375

*/

1376

__attribute__((nonnull, warn_unused_result))

1197

1377

int good_interface(const struct dirent *if_entry){

1198

1378

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

1199

1379

return 0;

1217

1397

/*

1218

1398

* This function determines if a network interface is up.

1219

1399

*/

1400

__attribute__((nonnull, warn_unused_result))

1220

1401

bool interface_is_up(const char *interface){

1221

1402

struct ifreq ifr;

1222

1403

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

1233

1414

/*

1234

1415

* This function determines if a network interface is running

1235

1416

*/

1417

__attribute__((nonnull, warn_unused_result))

1236

1418

bool interface_is_running(const char *interface){

1237

1419

struct ifreq ifr;

1238

1420

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

1246

1428

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

1247

1429

}

1248

1430

1431

__attribute__((nonnull, pure, warn_unused_result))

1249

1432

int notdotentries(const struct dirent *direntry){

1250

1433

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

1251

1434

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

1258

1441

}

1259

1442

1260

1443

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

1444

__attribute__((nonnull, warn_unused_result))

1261

1445

int runnable_hook(const struct dirent *direntry){

1262

1446

int ret;

1263

1447

size_t sret;

1271

1455

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

1272

1456

"abcdefghijklmnopqrstuvwxyz"

1273

1457

"0123456789"

1274

"_-");

1458

"_.-");

1275

1459

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

1276

1460

/* Contains non-allowed characters */

1277

1461

if(debug){

1281

1465

return 0;

1282

1466

}

1283

1467

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1468

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

1292

1469

if(ret == -1){

1293

1470

if(debug){

1294

1471

perror_plus("Could not stat hook");

1318

1495

return 1;

1319

1496

}

1320

1497

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1498

__attribute__((nonnull, warn_unused_result))

1499

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1500

mandos_context *mc){

1322

1501

int ret;

1323

1502

struct timespec now;

1324

1503

struct timespec waited_time;

1325

1504

intmax_t block_time;

1326

1505

1327

1506

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1507

if(mc->current_server == NULL){

1508

if(debug){

1330

1509

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

1331

1510

" No timeout!\n");

1332

1511

}

1333

1512

ret = avahi_simple_poll_iterate(s, -1);

1334

1513

} else {

1335

if (debug){

1514

if(debug){

1336

1515

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

1337

1516

" it, or wait\n");

1338

1517

}

1345

1524

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

1346

1525

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

1347

1526

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1527

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

1349

1528

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1529

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

1351

1530

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

1352

1531

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

1353

1532

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

1355

1534

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

1356

1535

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

1357

1536

1358

if (debug){

1537

if(debug){

1359

1538

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

1360

1539

block_time);

1361

1540

}

1362

1541

1363

1542

if(block_time <= 0){

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1543

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

1544

mc->current_server->port,

1545

mc->current_server->if_index,

1546

mc->current_server->af, mc);

1368

1547

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1548

avahi_simple_poll_quit(s);

1370

1549

return 0;

1371

1550

}

1372

1551

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1552

&mc->current_server->last_seen);

1374

1553

if(ret == -1){

1375

1554

perror_plus("clock_gettime");

1376

1555

return -1;

1377

1556

}

1378

mc.current_server = mc.current_server->next;

1557

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

1379

1558

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

1380

1559

servers, but don't block */

1381

1560

}

1383

1562

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

1384

1563

}

1385

1564

if(ret != 0){

1386

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

1565

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

1387

1566

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

1388

1567

}

1389

1568

}

1391

1570

}

1392

1571

1393

1572

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

1573

__attribute__((warn_unused_result))

1394

1574

error_t raise_privileges(void){

1395

1575

error_t old_errno = errno;

1396

1576

error_t ret_errno = 0;

1397

1577

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

1398

1578

ret_errno = errno;

1399

perror_plus("seteuid");

1400

1579

}

1401

1580

errno = old_errno;

1402

1581

return ret_errno;

1403

1582

}

1404

1583

1405

1584

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

1585

__attribute__((warn_unused_result))

1406

1586

error_t raise_privileges_permanently(void){

1407

1587

error_t old_errno = errno;

1408

1588

error_t ret_errno = raise_privileges();

1412

1592

}

1413

1593

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

1414

1594

ret_errno = errno;

1415

perror_plus("seteuid");

1416

1595

}

1417

1596

errno = old_errno;

1418

1597

return ret_errno;

1419

1598

}

1420

1599

1421

1600

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

1601

__attribute__((warn_unused_result))

1422

1602

error_t lower_privileges(void){

1423

1603

error_t old_errno = errno;

1424

1604

error_t ret_errno = 0;

1425

1605

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

1426

1606

ret_errno = errno;

1427

perror_plus("seteuid");

1428

1607

}

1429

1608

errno = old_errno;

1430

1609

return ret_errno;

1431

1610

}

1432

1611

1433

1612

/* Lower privileges permanently */

1613

__attribute__((warn_unused_result))

1434

1614

error_t lower_privileges_permanently(void){

1435

1615

error_t old_errno = errno;

1436

1616

error_t ret_errno = 0;

1437

1617

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

1438

1618

ret_errno = errno;

1439

perror_plus("setuid");

1440

1619

}

1441

1620

errno = old_errno;

1442

1621

return ret_errno;

1443

1622

}

1444

1623

1445

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

1624

__attribute__((nonnull))

1625

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

1446

1626

const float delay){

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1627

struct dirent **direntries = NULL;

1628

if(hookdir_fd == -1){

1629

hookdir_fd = open(hookdir, O_RDONLY);

1630

if(hookdir_fd == -1){

1631

if(errno == ENOENT){

1632

if(debug){

1633

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

1634

" found\n", hookdir);

1635

}

1636

} else {

1637

perror_plus("open");

1638

}

1639

return;

1640

}

1641

}

1642

#ifdef __GLIBC__

1643

#if __GLIBC_PREREQ(2, 15)

1644

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

1645

runnable_hook, alphasort);

1646

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

1647

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

1648

alphasort);

1649

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

1650

#else /* not __GLIBC__ */

1651

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

1652

alphasort);

1653

#endif /* not __GLIBC__ */

1452

1654

if(numhooks == -1){

1453

1655

perror_plus("scandir");

1454

} else {

1455

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

1456

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

1457

direntry = direntries[i];

1458

char *fullname = NULL;

1459

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

1460

if(ret < 0){

1656

return;

1657

}

1658

struct dirent *direntry;

1659

int ret;

1660

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

1661

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

1662

direntry = direntries[i];

1663

if(debug){

1664

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

1665

direntry->d_name);

1666

}

1667

pid_t hook_pid = fork();

1668

if(hook_pid == 0){

1669

/* Child */

1670

/* Raise privileges */

1671

errno = raise_privileges_permanently();

1672

if(errno != 0){

1673

perror_plus("Failed to raise privileges");

1674

_exit(EX_NOPERM);

1675

}

1676

/* Set group */

1677

errno = 0;

1678

ret = setgid(0);

1679

if(ret == -1){

1680

perror_plus("setgid");

1681

_exit(EX_NOPERM);

1682

}

1683

/* Reset supplementary groups */

1684

errno = 0;

1685

ret = setgroups(0, NULL);

1686

if(ret == -1){

1687

perror_plus("setgroups");

1688

_exit(EX_NOPERM);

1689

}

1690

ret = dup2(devnull, STDIN_FILENO);

1691

if(ret == -1){

1692

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

1693

_exit(EX_OSERR);

1694

}

1695

ret = close(devnull);

1696

if(ret == -1){

1697

perror_plus("close");

1698

_exit(EX_OSERR);

1699

}

1700

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1701

if(ret == -1){

1702

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

1703

_exit(EX_OSERR);

1704

}

1705

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

1706

if(ret == -1){

1707

perror_plus("setenv");

1708

_exit(EX_OSERR);

1709

}

1710

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

1711

if(ret == -1){

1712

perror_plus("setenv");

1713

_exit(EX_OSERR);

1714

}

1715

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

1716

if(ret == -1){

1717

perror_plus("setenv");

1718

_exit(EX_OSERR);

1719

}

1720

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

1721

if(ret == -1){

1722

perror_plus("setenv");

1723

_exit(EX_OSERR);

1724

}

1725

char *delaystring;

1726

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

1727

if(ret == -1){

1461

1728

perror_plus("asprintf");

1462

continue;

1463

}

1464

if(debug){

1465

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

1466

direntry->d_name);

1467

}

1468

pid_t hook_pid = fork();

1469

if(hook_pid == 0){

1470

/* Child */

1471

/* Raise privileges */

1472

raise_privileges_permanently();

1473

/* Set group */

1474

errno = 0;

1475

ret = setgid(0);

1476

if(ret == -1){

1477

perror_plus("setgid");

1478

}

1479

/* Reset supplementary groups */

1480

errno = 0;

1481

ret = setgroups(0, NULL);

1482

if(ret == -1){

1483

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

char *delaystring;

1509

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

1510

if(ret == -1){

1511

perror_plus("asprintf");

1512

_exit(EX_OSERR);

1513

}

1514

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

1515

if(ret == -1){

1516

free(delaystring);

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1729

_exit(EX_OSERR);

1730

}

1731

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

1732

if(ret == -1){

1520

1733

free(delaystring);

1521

if(connect_to != NULL){

1522

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

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

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

1529

perror_plus("execl");

1530

_exit(EXIT_FAILURE);

1531

}

1734

perror_plus("setenv");

1735

_exit(EX_OSERR);

1736

}

1737

free(delaystring);

1738

if(connect_to != NULL){

1739

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

1740

if(ret == -1){

1741

perror_plus("setenv");

1742

_exit(EX_OSERR);

1743

}

1744

}

1745

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1746

if(hook_fd == -1){

1747

perror_plus("openat");

1748

_exit(EXIT_FAILURE);

1749

}

1750

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

1751

perror_plus("close");

1752

_exit(EXIT_FAILURE);

1753

}

1754

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

1755

environ) == -1){

1756

perror_plus("fexecve");

1757

_exit(EXIT_FAILURE);

1758

}

1759

} else {

1760

if(hook_pid == -1){

1761

perror_plus("fork");

1762

free(direntry);

1763

continue;

1764

}

1765

int status;

1766

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

1767

perror_plus("waitpid");

1768

free(direntry);

1769

continue;

1770

}

1771

if(WIFEXITED(status)){

1772

if(WEXITSTATUS(status) != 0){

1773

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

1774

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

1775

WEXITSTATUS(status));

1776

free(direntry);

1777

continue;

1778

}

1779

} else if(WIFSIGNALED(status)){

1780

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

1781

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

1782

WTERMSIG(status));

1783

free(direntry);

1784

continue;

1532

1785

} else {

1533

int status;

1534

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

1535

perror_plus("waitpid");

1536

free(fullname);

1537

continue;

1538

}

1539

if(WIFEXITED(status)){

1540

if(WEXITSTATUS(status) != 0){

1541

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

1542

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

1543

WEXITSTATUS(status));

1544

free(fullname);

1545

continue;

1546

}

1547

} else if(WIFSIGNALED(status)){

1548

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

1549

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

1550

WTERMSIG(status));

1551

free(fullname);

1552

continue;

1553

} else {

1554

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

1555

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

1556

free(fullname);

1557

continue;

1558

}

1559

}

1560

free(fullname);

1561

if(debug){

1562

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

1563

direntry->d_name);

1564

}

1565

}

1566

close(devnull);

1567

}

1568

return true;

1786

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

1787

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

1788

free(direntry);

1789

continue;

1790

}

1791

}

1792

if(debug){

1793

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

1794

direntry->d_name);

1795

}

1796

free(direntry);

1797

}

1798

free(direntries);

1799

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

1800

perror_plus("close");

1801

} else {

1802

hookdir_fd = -1;

1803

}

1804

close(devnull);

1569

1805

}

1570

1806

1807

__attribute__((nonnull, warn_unused_result))

1571

1808

error_t bring_up_interface(const char *const interface,

1572

1809

const float delay){

1573

int sd = -1;

1574

1810

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1811

int ret;

1577

1812

struct ifreq network;

1578

1813

unsigned int if_index = if_nametoindex(interface);

1579

1814

if(if_index == 0){

1588

1823

}

1589

1824

1590

1825

if(not interface_is_up(interface)){

1591

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

1826

error_t ret_errno = 0, ioctl_errno = 0;

1827

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

1592

1828

ret_errno = errno;

1593

1829

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

1594

1830

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

1831

errno = old_errno;

1595

1832

return ret_errno;

1596

1833

}

1597

network.ifr_flags |= IFF_UP;

1834

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

1598

1835

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1836

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

1837

if(sd == -1){

1601

1838

ret_errno = errno;

1602

1839

perror_plus("socket");

1603

1840

errno = old_errno;

1604

1841

return ret_errno;

1605

1842

}

1606

1843

1607

1844

if(quit_now){

1608

close(sd);

1845

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

1846

if(ret == -1){

1847

perror_plus("close");

1848

}

1609

1849

errno = old_errno;

1610

1850

return EINTR;

1611

1851

}

1615

1855

interface);

1616

1856

}

1617

1857

1618

/* Raise priviliges */

1619

raise_privileges();

1858

/* Raise privileges */

1859

ret_errno = raise_privileges();

1860

if(ret_errno != 0){

1861

errno = ret_errno;

1862

perror_plus("Failed to raise privileges");

1863

}

1620

1864

1621

1865

#ifdef __linux__

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

int ret_linux = klogctl(8, NULL, 5);

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1866

int ret_linux;

1867

bool restore_loglevel = false;

1868

if(ret_errno == 0){

1869

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1870

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

1871

ret_linux = klogctl(8, NULL, 5);

1872

if(ret_linux == -1){

1873

perror_plus("klogctl");

1874

} else {

1875

restore_loglevel = true;

1876

}

1629

1877

}

1630

1878

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

1879

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

1880

ioctl_errno = errno;

1633

1881

#ifdef __linux__

1634

1882

if(restore_loglevel){

1635

1883

ret_linux = klogctl(7, NULL, 0);

1639

1887

}

1640

1888

#endif /* __linux__ */

1641

1889

1642

/* Lower privileges */

1643

lower_privileges();

1890

/* If raise_privileges() succeeded above */

1891

if(ret_errno == 0){

1892

/* Lower privileges */

1893

ret_errno = lower_privileges();

1894

if(ret_errno != 0){

1895

errno = ret_errno;

1896

perror_plus("Failed to lower privileges");

1897

}

1898

}

1644

1899

1645

1900

/* Close the socket */

1646

1901

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

1649

1904

}

1650

1905

1651

1906

if(ret_setflags == -1){

1652

errno = ret_errno;

1907

errno = ioctl_errno;

1653

1908

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

1909

errno = old_errno;

1655

return ret_errno;

1910

return ioctl_errno;

1656

1911

}

1657

1912

} else if(debug){

1658

1913

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

1676

1931

return 0;

1677

1932

}

1678

1933

1934

__attribute__((nonnull, warn_unused_result))

1679

1935

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

1936

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1684

1937

struct ifreq network;

1685

1938

unsigned int if_index = if_nametoindex(interface);

1686

1939

if(if_index == 0){

1689

1942

return ENXIO;

1690

1943

}

1691

1944

if(interface_is_up(interface)){

1945

error_t ret_errno = 0, ioctl_errno = 0;

1692

1946

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

1693

1947

ret_errno = errno;

1694

1948

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

1695

1949

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

1950

errno = old_errno;

1696

1951

return ret_errno;

1697

1952

}

1698

1953

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

1699

1954

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1955

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

1956

if(sd == -1){

1702

1957

ret_errno = errno;

1703

1958

perror_plus("socket");

1704

1959

errno = old_errno;

1710

1965

interface);

1711

1966

}

1712

1967

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

1968

/* Raise privileges */

1969

ret_errno = raise_privileges();

1970

if(ret_errno != 0){

1971

errno = ret_errno;

1972

perror_plus("Failed to raise privileges");

1973

}

1974

1975

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

1976

ioctl_errno = errno;

1977

1978

/* If raise_privileges() succeeded above */

1979

if(ret_errno == 0){

1980

/* Lower privileges */

1981

ret_errno = lower_privileges();

1982

if(ret_errno != 0){

1983

errno = ret_errno;

1984

perror_plus("Failed to lower privileges");

1985

}

1986

}

1721

1987

1722

1988

/* Close the socket */

1723

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

1989

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

1724

1990

if(ret == -1){

1725

1991

perror_plus("close");

1726

1992

}

1727

1993

1728

1994

if(ret_setflags == -1){

1729

errno = ret_errno;

1995

errno = ioctl_errno;

1730

1996

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

1997

errno = old_errno;

1732

return ret_errno;

1998

return ioctl_errno;

1733

1999

}

1734

2000

} else if(debug){

1735

2001

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

1741

2007

}

1742

2008

1743

2009

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

2010

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

2011

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

2012

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

2013

.interfaces = NULL, .interfaces_size = 0 };

1744

2014

AvahiSServiceBrowser *sb = NULL;

1745

2015

error_t ret_errno;

1746

2016

int ret;

1747

2017

intmax_t tmpmax;

1748

2018

char *tmp;

1749

2019

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

2020

char *interfaces_to_take_down = NULL;

1753

2021

size_t interfaces_to_take_down_size = 0;

1754

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

1755

bool tempdir_created = false;

2022

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

2023

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

2024

char *tempdir = NULL;

1756

2025

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1757

2026

const char *seckey = PATHDIR "/" SECKEY;

1758

2027

const char *pubkey = PATHDIR "/" PUBKEY;

1759

2028

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1761

2029

1762

2030

bool gnutls_initialized = false;

1763

2031

bool gpgme_initialized = false;

1854

2122

connect_to = arg;

1855

2123

break;

1856

2124

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

1857

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1858

(int)',');

2125

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

2126

arg, (int)',');

1859

2127

if(ret_errno != 0){

1860

2128

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

1861

2129

}

1941

2209

/* Work around Debian bug #633582:

1942

2210

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

1943

2211

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2212

/* Re-raise privileges */

2213

ret_errno = raise_privileges();

2214

if(ret_errno != 0){

2215

errno = ret_errno;

2216

perror_plus("Failed to raise privileges");

2217

} else {

1946

2218

struct stat st;

1947

2219

1948

2220

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1988

2260

}

1989

2261

1990

2262

/* Lower privileges */

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2263

ret_errno = lower_privileges();

2264

if(ret_errno != 0){

2265

errno = ret_errno;

2266

perror_plus("Failed to lower privileges");

1995

2267

}

1996

2268

}

1997

2269

}

1998

2270

1999

/* Remove empty interface names */

2271

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

2000

2272

{

2001

2273

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2274

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

2003

2275

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2276

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

2277

and if_nametoindex(interface) == 0){

2278

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

2006

2279

fprintf_plus(stderr, "Not using nonexisting interface"

2007

2280

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

2008

2281

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2282

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

2010

2283

interface = NULL;

2011

2284

}

2012

2285

}

2014

2287

2015

2288

/* Run network hooks */

2016

2289

{

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

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

2026

goto end;

2027

}

2290

if(mc.interfaces != NULL){

2291

interfaces_hooks = malloc(mc.interfaces_size);

2292

if(interfaces_hooks == NULL){

2293

perror_plus("malloc");

2294

goto end;

2295

}

2296

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

2297

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

2298

}

2299

run_network_hooks("start", interfaces_hooks != NULL ?

2300

interfaces_hooks : "", delay);

2028

2301

}

2029

2302

2030

2303

if(not debug){

2035

2308

from the signal handler */

2036

2309

/* Initialize the pseudo-RNG for Avahi */

2037

2310

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

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2311

simple_poll = avahi_simple_poll_new();

2312

if(simple_poll == NULL){

2040

2313

fprintf_plus(stderr,

2041

2314

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

2042

2315

exitcode = EX_UNAVAILABLE;

2107

2380

}

2108

2381

2109

2382

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

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2383

if(mc.interfaces == NULL){

2384

struct dirent **direntries = NULL;

2112

2385

/* Look for any good interfaces */

2113

2386

ret = scandir(sys_class_net, &direntries, good_interface,

2114

2387

alphasort);

2115

2388

if(ret >= 1){

2116

2389

/* Add all found interfaces to interfaces list */

2117

2390

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2391

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

2119

2392

direntries[i]->d_name);

2120

2393

if(ret_errno != 0){

2394

errno = ret_errno;

2121

2395

perror_plus("argz_add");

2396

free(direntries[i]);

2122

2397

continue;

2123

2398

}

2124

2399

if(debug){

2125

2400

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

2126

2401

direntries[i]->d_name);

2127

2402

}

2403

free(direntries[i]);

2128

2404

}

2129

2405

free(direntries);

2130

2406

} else {

2131

free(direntries);

2407

if(ret == 0){

2408

free(direntries);

2409

}

2132

2410

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

2133

2411

exitcode = EXIT_FAILURE;

2134

2412

goto end;

2135

2413

}

2136

2414

}

2137

2415

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

if(not (argz_count(interfaces, interfaces_size) == 1

2149

and strcmp(interfaces, "none") == 0)){

2416

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

2417

{

2150

2418

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2419

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

2152

2420

interface))){

2421

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

2422

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

2423

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

2424

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

2425

interface);

2426

interface = NULL;

2427

while((interface = argz_next(mc.interfaces,

2428

mc.interfaces_size, interface))){

2429

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

2430

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

2431

interface);

2432

interface = NULL;

2433

}

2434

}

2435

break;

2436

}

2153

2437

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2438

errno = bring_up_interface(interface, delay);

2155

2439

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2440

if(errno != 0){

2158

2441

perror_plus("Failed to bring up interface");

2159

2442

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2443

errno = argz_add(&interfaces_to_take_down,

2444

&interfaces_to_take_down_size,

2445

interface);

2446

if(errno != 0){

2447

perror_plus("argz_add");

2448

}

2163

2449

}

2164

2450

}

2165

2451

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

2452

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

2170

2453

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

2171

2454

}

2172

2455

}

2173

2456

2457

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

2458

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

2459

if(debug){

2460

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

2461

mc.interfaces);

2462

}

2463

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

2464

}

2465

2174

2466

if(quit_now){

2175

2467

goto end;

2176

2468

}

2177

2469

2178

ret = init_gnutls_global(pubkey, seckey);

2470

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

2179

2471

if(ret == -1){

2180

2472

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

2181

2473

exitcode = EX_UNAVAILABLE;

2188

2480

goto end;

2189

2481

}

2190

2482

2191

if(mkdtemp(tempdir) == NULL){

2483

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

2484

tempdir = mkdtemp(run_tempdir);

2485

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

2486

if(debug){

2487

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

2488

run_tempdir, old_tempdir);

2489

}

2490

tempdir = mkdtemp(old_tempdir);

2491

}

2492

if(tempdir == NULL){

2192

2493

perror_plus("mkdtemp");

2193

2494

goto end;

2194

2495

}

2195

tempdir_created = true;

2196

2496

2197

2497

if(quit_now){

2198

2498

goto end;

2199

2499

}

2200

2500

2201

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

2501

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

2202

2502

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

2203

2503

exitcode = EX_UNAVAILABLE;

2204

2504

goto end;

2225

2525

goto end;

2226

2526

}

2227

2527

2228

uint16_t port;

2528

in_port_t port;

2229

2529

errno = 0;

2230

2530

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

2231

2531

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

2232

or tmpmax != (uint16_t)tmpmax){

2532

or tmpmax != (in_port_t)tmpmax){

2233

2533

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

2234

2534

exitcode = EX_USAGE;

2235

2535

goto end;

2236

2536

}

2237

2537

2238

2538

if(quit_now){

2239

2539

goto end;

2240

2540

}

2241

2541

2242

port = (uint16_t)tmpmax;

2542

port = (in_port_t)tmpmax;

2243

2543

*address = '\0';

2244

2544

/* Colon in address indicates IPv6 */

2245

2545

int af;

2261

2561

}

2262

2562

2263

2563

while(not quit_now){

2264

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

2564

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

2565

&mc);

2265

2566

if(quit_now or ret == 0){

2266

2567

break;

2267

2568

}

2269

2570

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

2270

2571

(int)retry_interval);

2271

2572

}

2272

sleep((int)retry_interval);

2573

sleep((unsigned int)retry_interval);

2273

2574

}

2274

2575

2275

if (not quit_now){

2576

if(not quit_now){

2276

2577

exitcode = EXIT_SUCCESS;

2277

2578

}

2278

2579

2293

2594

config.publish_domain = 0;

2294

2595

2295

2596

/* Allocate a new server */

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2597

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2598

&config, NULL, NULL, &ret_errno);

2299

2599

2300

2600

/* Free the Avahi configuration data */

2301

2601

avahi_server_config_free(&config);

2316

2616

/* Create the Avahi service browser */

2317

2617

sb = avahi_s_service_browser_new(mc.server, if_index,

2318

2618

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2319

NULL, 0, browse_callback, NULL);

2619

NULL, 0, browse_callback,

2620

(void *)&mc);

2320

2621

if(sb == NULL){

2321

2622

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

2322

2623

avahi_strerror(avahi_server_errno(mc.server)));

2333

2634

if(debug){

2334

2635

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

2335

2636

}

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2637

2638

ret = avahi_loop_with_timeout(simple_poll,

2639

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

2339

2640

if(debug){

2340

2641

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

2341

2642

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

2348

2649

}

2349

2650

2350

2651

/* Cleanup things */

2652

free(mc.interfaces);

2653

2351

2654

if(sb != NULL)

2352

2655

avahi_s_service_browser_free(sb);

2353

2656

2354

2657

if(mc.server != NULL)

2355

2658

avahi_server_free(mc.server);

2356

2659

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2660

if(simple_poll != NULL)

2661

avahi_simple_poll_free(simple_poll);

2359

2662

2360

2663

if(gnutls_initialized){

2361

2664

gnutls_certificate_free_credentials(mc.cred);

2373

2676

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

2374

2677

while(mc.current_server != NULL){

2375

2678

server *next = mc.current_server->next;

2679

#ifdef __GNUC__

2680

#pragma GCC diagnostic push

2681

#pragma GCC diagnostic ignored "-Wcast-qual"

2682

#endif

2683

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

2684

#ifdef __GNUC__

2685

#pragma GCC diagnostic pop

2686

#endif

2376

2687

free(mc.current_server);

2377

2688

mc.current_server = next;

2378

2689

}

2379

2690

}

2380

2691

2381

/* Re-raise priviliges */

2692

/* Re-raise privileges */

2382

2693

{

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

2398

}

2399

}

2400

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

2401

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

2402

" down\n");

2403

}

2404

}

2405

2406

lower_privileges_permanently();

2694

ret_errno = raise_privileges();

2695

if(ret_errno != 0){

2696

errno = ret_errno;

2697

perror_plus("Failed to raise privileges");

2698

} else {

2699

2700

/* Run network hooks */

2701

run_network_hooks("stop", interfaces_hooks != NULL ?

2702

interfaces_hooks : "", delay);

2703

2704

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

2705

{

2706

char *interface = NULL;

2707

while((interface=argz_next(interfaces_to_take_down,

2708

interfaces_to_take_down_size,

2709

interface))){

2710

ret_errno = take_down_interface(interface);

2711

if(ret_errno != 0){

2712

errno = ret_errno;

2713

perror_plus("Failed to take down interface");

2714

}

2715

}

2716

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

2717

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

2718

" down\n");

2719

}

2720

}

2721

}

2722

2723

ret_errno = lower_privileges_permanently();

2724

if(ret_errno != 0){

2725

errno = ret_errno;

2726

perror_plus("Failed to lower privileges permanently");

2727

}

2407

2728

}

2408

2729

2409

2730

free(interfaces_to_take_down);

2410

2731

free(interfaces_hooks);

2411

2732

2412

2733

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

2413

if(tempdir_created){

2734

if(tempdir != NULL){

2414

2735

struct dirent **direntries = NULL;

2415

struct dirent *direntry = NULL;

2416

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

2417

alphasort);

2418

if (numentries > 0){

2419

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

2420

direntry = direntries[i];

2421

char *fullname = NULL;

2422

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

2423

direntry->d_name);

2424

if(ret < 0){

2425

perror_plus("asprintf");

2426

continue;

2427

}

2428

ret = remove(fullname);

2429

if(ret == -1){

2430

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

2431

strerror(errno));

2432

}

2433

free(fullname);

2736

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

2737

O_NOFOLLOW));

2738

if(tempdir_fd == -1){

2739

perror_plus("open");

2740

} else {

2741

#ifdef __GLIBC__

2742

#if __GLIBC_PREREQ(2, 15)

2743

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

2744

notdotentries, alphasort);

2745

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

2746

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

2747

alphasort);

2748

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

2749

#else /* not __GLIBC__ */

2750

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

2751

alphasort);

2752

#endif /* not __GLIBC__ */

2753

if(numentries >= 0){

2754

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

2755

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

2756

if(ret == -1){

2757

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

2758

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

2759

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

2760

}

2761

free(direntries[i]);

2762

}

2763

2764

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

2765

free(direntries);

2766

if(numentries == -1){

2767

perror_plus("scandir");

2768

}

2769

ret = rmdir(tempdir);

2770

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

2771

perror_plus("rmdir");

2772

}

2434

2773

}

2435

}

2436

2437

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

2438

free(direntries);

2439

if (numentries == -1){

2440

perror_plus("scandir");

2441

}

2442

ret = rmdir(tempdir);

2443

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

2444

perror_plus("rmdir");

2774

TEMP_FAILURE_RETRY(close(tempdir_fd));

2445

2775

}

2446

2776

}

2447

2777