/mandos/trunk : revision 678

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

55

opendir(), DIR */

56

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

57

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

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inet_pton(), connect() */

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inet_pton(), connect(),

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getnameinfo() */

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60

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

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61

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

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62

*/

62

63

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

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strtoimax() */

64

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

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

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program_invocation_short_name */

67

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

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

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

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

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argp_state, struct argp,

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argz_delete(), argz_append(),

93

argz_stringify(), argz_add(),

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argz_count() */

95

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

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EAI_SYSTEM, gai_strerror() */

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#ifdef __linux__

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99

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

134

136

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bool debug = false;

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138

static const char mandos_protocol_version[] = "1";

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

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

139

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

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

139

141

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

140

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char *connect_to = NULL;

141

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const char *hookdir = HOOKDIR;

145

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

146

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typedef struct server{

147

149

const char *ip;

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uint16_t port;

150

in_port_t port;

149

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AvahiIfIndex if_index;

150

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int af;

151

153

struct timespec last_seen;

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157

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

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typedef struct {

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AvahiSimplePoll *simple_poll;

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AvahiServer *server;

160

161

gnutls_certificate_credentials_t cred;

161

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unsigned int dh_bits;

163

164

const char *priority;

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gpgme_ctx_t ctx;

165

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server *current_server;

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char *interfaces;

168

size_t interfaces_size;

166

169

} mandos_context;

167

170

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

169

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

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.dh_bits = 1024, .priority = "SECURE256"

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

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.current_server = NULL };

171

/* global so signal handler can reach it*/

172

AvahiSimplePoll *simple_poll;

173

174

sig_atomic_t quit_now = 0;

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int signal_received = 0;

183

perror(print_text);

184

}

185

186

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

186

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

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

188

va_list ap;

189

va_start (ap, format);

190

191

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

192

program_invocation_short_name));

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

193

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

194

}

195

196

/*

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

199

* "buffer_length" is how much is already used.

200

*/

201

__attribute__((nonnull, warn_unused_result))

201

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

203

204

if(buffer_length + BUFFER_SIZE > buffer_capacity){

204

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

205

if(buffer == NULL){

205

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

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if(new_buf == NULL){

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int old_errno = errno;

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free(*buffer);

209

errno = old_errno;

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*buffer = NULL;

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211

return 0;

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}

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*buffer = new_buf;

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buffer_capacity += BUFFER_SIZE;

209

215

}

210

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return buffer_capacity;

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}

212

218

213

219

/* 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){

220

__attribute__((nonnull, warn_unused_result))

221

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

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int af, server **current_server){

216

223

int ret;

217

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

218

225

if(new_server == NULL){

227

234

perror_plus("strdup");

228

235

return false;

229

236

}

237

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

238

if(ret == -1){

239

perror_plus("clock_gettime");

240

return false;

241

}

230

242

/* Special case of first server */

231

if (mc.current_server == NULL){

243

if(*current_server == NULL){

232

244

new_server->next = new_server;

233

245

new_server->prev = new_server;

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mc.current_server = new_server;

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

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*current_server = new_server;

236

247

} else {

237

new_server->next = mc.current_server;

238

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

248

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

249

new_server->next = *current_server;

250

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

239

251

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;

252

(*current_server)->prev = new_server;

246

253

}

247

254

return true;

248

255

}

250

257

/*

251

258

* Initialize GPGME.

252

259

*/

253

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

254

const char *tempdir){

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

255

265

gpgme_error_t rc;

256

266

gpgme_engine_info_t engine_info;

257

267

258

259

268

/*

260

269

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

261

270

*/

262

bool import_key(const char *filename){

271

bool import_key(const char * const filename){

263

272

int ret;

264

273

int fd;

265

274

gpgme_data_t pgp_data;

277

286

return false;

278

287

}

279

288

280

rc = gpgme_op_import(mc.ctx, pgp_data);

289

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

281

290

if(rc != GPG_ERR_NO_ERROR){

282

291

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

283

292

gpgme_strsource(rc), gpgme_strerror(rc));

327

336

}

328

337

329

338

/* Create new GPGME "context" */

330

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

339

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

331

340

if(rc != GPG_ERR_NO_ERROR){

332

341

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

333

342

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

346

355

* Decrypt OpenPGP data.

347

356

* Returns -1 on error

348

357

*/

358

__attribute__((nonnull, warn_unused_result))

349

359

static ssize_t pgp_packet_decrypt(const char *cryptotext,

350

360

size_t crypto_size,

351

char **plaintext){

361

char **plaintext,

362

mandos_context *mc){

352

363

gpgme_data_t dh_crypto, dh_plain;

353

364

gpgme_error_t rc;

354

365

ssize_t ret;

380

391

381

392

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

382

393

data buffer */

383

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

394

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

384

395

if(rc != GPG_ERR_NO_ERROR){

385

396

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

386

397

gpgme_strsource(rc), gpgme_strerror(rc));

387

398

plaintext_length = -1;

388

399

if(debug){

389

400

gpgme_decrypt_result_t result;

390

result = gpgme_op_decrypt_result(mc.ctx);

401

result = gpgme_op_decrypt_result(mc->ctx);

391

402

if(result == NULL){

392

403

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

393

404

} else {

470

481

return plaintext_length;

471

482

}

472

483

473

static const char * safer_gnutls_strerror(int value){

474

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

475

-Wunreachable-code */

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

486

const char *ret = gnutls_strerror(value);

476

487

if(ret == NULL)

477

488

ret = "(unknown)";

478

489

return ret;

479

490

}

480

491

481

492

/* GnuTLS log function callback */

493

__attribute__((nonnull))

482

494

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

483

495

const char* string){

484

496

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

485

497

}

486

498

499

__attribute__((nonnull, warn_unused_result))

487

500

static int init_gnutls_global(const char *pubkeyfilename,

488

const char *seckeyfilename){

501

const char *seckeyfilename,

502

mandos_context *mc){

489

503

int ret;

490

504

491

505

if(debug){

508

522

}

509

523

510

524

/* OpenPGP credentials */

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

525

ret = gnutls_certificate_allocate_credentials(&mc->cred);

512

526

if(ret != GNUTLS_E_SUCCESS){

513

527

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

514

528

safer_gnutls_strerror(ret));

524

538

}

525

539

526

540

ret = gnutls_certificate_set_openpgp_key_file

527

(mc.cred, pubkeyfilename, seckeyfilename,

541

(mc->cred, pubkeyfilename, seckeyfilename,

528

542

GNUTLS_OPENPGP_FMT_BASE64);

529

543

if(ret != GNUTLS_E_SUCCESS){

530

544

fprintf_plus(stderr,

536

550

}

537

551

538

552

/* GnuTLS server initialization */

539

ret = gnutls_dh_params_init(&mc.dh_params);

553

ret = gnutls_dh_params_init(&mc->dh_params);

540

554

if(ret != GNUTLS_E_SUCCESS){

541

555

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

542

556

" initialization: %s\n",

543

557

safer_gnutls_strerror(ret));

544

558

goto globalfail;

545

559

}

546

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

560

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

547

561

if(ret != GNUTLS_E_SUCCESS){

548

562

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

549

563

safer_gnutls_strerror(ret));

550

564

goto globalfail;

551

565

}

552

566

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

567

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

554

568

555

569

return 0;

556

570

557

571

globalfail:

558

572

559

gnutls_certificate_free_credentials(mc.cred);

573

gnutls_certificate_free_credentials(mc->cred);

560

574

gnutls_global_deinit();

561

gnutls_dh_params_deinit(mc.dh_params);

575

gnutls_dh_params_deinit(mc->dh_params);

562

576

return -1;

563

577

}

564

578

565

static int init_gnutls_session(gnutls_session_t *session){

579

__attribute__((nonnull, warn_unused_result))

580

static int init_gnutls_session(gnutls_session_t *session,

581

mandos_context *mc){

566

582

int ret;

567

583

/* GnuTLS session creation */

568

584

do {

580

596

{

581

597

const char *err;

582

598

do {

583

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

599

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

584

600

if(quit_now){

585

601

gnutls_deinit(*session);

586

602

return -1;

597

613

598

614

do {

599

615

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

600

mc.cred);

616

mc->cred);

601

617

if(quit_now){

602

618

gnutls_deinit(*session);

603

619

return -1;

613

629

/* ignore client certificate if any. */

614

630

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

615

631

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

632

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

617

633

618

634

return 0;

619

635

}

623

639

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

624

640

625

641

/* Called when a Mandos server is found */

626

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

642

__attribute__((nonnull, warn_unused_result))

643

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

627

644

AvahiIfIndex if_index,

628

int af){

645

int af, mandos_context *mc){

629

646

int ret, tcp_sd = -1;

630

647

ssize_t sret;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

648

struct sockaddr_storage to;

635

649

char *buffer = NULL;

636

650

char *decrypted_buffer = NULL;

637

651

size_t buffer_length = 0;

661

675

return -1;

662

676

}

663

677

664

ret = init_gnutls_session(&session);

678

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

679

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

680

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

681

bool match = false;

682

{

683

char *interface = NULL;

684

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

685

interface))){

686

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

687

match = true;

688

break;

689

}

690

}

691

}

692

if(not match){

693

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

694

connect to the server */

695

if(debug){

696

char interface[IF_NAMESIZE];

697

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

698

perror_plus("if_indextoname");

699

} else {

700

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

701

" \"%s\"\n",

702

if_indextoname((unsigned int)if_index,

703

interface));

704

}

705

}

706

return -1;

707

}

708

}

709

710

ret = init_gnutls_session(&session, mc);

665

711

if(ret != 0){

666

712

return -1;

667

713

}

668

714

669

715

if(debug){

670

716

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

671

PRIu16 "\n", ip, port);

717

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

672

718

}

673

719

674

720

tcp_sd = socket(pf, SOCK_STREAM, 0);

686

732

687

733

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

688

734

if(af == AF_INET6){

689

to.in6.sin6_family = (sa_family_t)af;

690

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

735

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

736

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

691

737

} else { /* IPv4 */

692

to.in.sin_family = (sa_family_t)af;

693

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

738

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

739

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

694

740

}

695

741

if(ret < 0 ){

696

742

int e = errno;

705

751

goto mandos_end;

706

752

}

707

753

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*/

754

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

755

if(IN6_IS_ADDR_LINKLOCAL

756

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

715

757

if(if_index == AVAHI_IF_UNSPEC){

716

758

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

717

759

" incomplete without a network interface\n");

719

761

goto mandos_end;

720

762

}

721

763

/* Set the network interface number as scope */

722

to.in6.sin6_scope_id = (uint32_t)if_index;

764

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

723

765

}

724

766

} else {

725

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

726

-Wconversion and

727

-Wunreachable-code */

767

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

728

768

}

729

769

730

770

if(quit_now){

738

778

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

739

779

perror_plus("if_indextoname");

740

780

} else {

741

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

742

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

781

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

782

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

743

783

}

744

784

} else {

745

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

746

ip, port);

785

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

786

ip, (uintmax_t)port);

747

787

}

748

788

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

749

789

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

const char *pcret;

751

790

if(af == AF_INET6){

752

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

753

sizeof(addrstr));

791

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

792

sizeof(struct sockaddr_in6),

793

addrstr, sizeof(addrstr), NULL, 0,

794

NI_NUMERICHOST);

754

795

} else {

755

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

756

sizeof(addrstr));

796

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

797

sizeof(struct sockaddr_in),

798

addrstr, sizeof(addrstr), NULL, 0,

799

NI_NUMERICHOST);

757

800

}

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

}

801

if(ret == EAI_SYSTEM){

802

perror_plus("getnameinfo");

803

} else if(ret != 0) {

804

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

805

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

806

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

764

807

}

765

808

}

766

809

770

813

}

771

814

772

815

if(af == AF_INET6){

773

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

816

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

817

sizeof(struct sockaddr_in6));

774

818

} else {

775

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

819

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

820

sizeof(struct sockaddr_in));

776

821

}

777

822

if(ret < 0){

778

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

823

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

779

824

int e = errno;

780

825

perror_plus("connect");

781

826

errno = e;

942

987

if(buffer_length > 0){

943

988

ssize_t decrypted_buffer_size;

944

989

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

945

&decrypted_buffer);

990

&decrypted_buffer, mc);

946

991

if(decrypted_buffer_size >= 0){

947

992

948

993

written = 0;

996

1041

return retval;

997

1042

}

998

1043

1044

__attribute__((nonnull))

999

1045

static void resolve_callback(AvahiSServiceResolver *r,

1000

1046

AvahiIfIndex interface,

1001

1047

AvahiProtocol proto,

1009

1055

AVAHI_GCC_UNUSED AvahiStringList *txt,

1010

1056

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1011

1057

flags,

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1058

void *mc){

1059

if(r == NULL){

1060

return;

1061

}

1014

1062

1015

1063

/* Called whenever a service has been resolved successfully or

1016

1064

timed out */

1025

1073

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

1026

1074

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

1027

1075

domain,

1028

avahi_strerror(avahi_server_errno(mc.server)));

1076

avahi_strerror(avahi_server_errno

1077

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

1029

1078

break;

1030

1079

1031

1080

case AVAHI_RESOLVER_FOUND:

1037

1086

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

1038

1087

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

1039

1088

}

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1089

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

1090

interface,

1091

avahi_proto_to_af(proto),

1092

mc);

1042

1093

if(ret == 0){

1043

avahi_simple_poll_quit(mc.simple_poll);

1094

avahi_simple_poll_quit(simple_poll);

1044

1095

} else {

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1096

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

1097

avahi_proto_to_af(proto),

1098

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

1047

1099

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

1048

1100

" list\n", name);

1049

1101

}

1062

1114

const char *domain,

1063

1115

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1064

1116

flags,

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1117

void *mc){

1118

if(b == NULL){

1119

return;

1120

}

1067

1121

1068

1122

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

1069

1123

is removed from the LAN */

1077

1131

case AVAHI_BROWSER_FAILURE:

1078

1132

1079

1133

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

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1134

avahi_strerror(avahi_server_errno

1135

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

1136

avahi_simple_poll_quit(simple_poll);

1082

1137

return;

1083

1138

1084

1139

case AVAHI_BROWSER_NEW:

1087

1142

the callback function is called the Avahi server will free the

1088

1143

resolver for us. */

1089

1144

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1145

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

1146

interface, protocol, name, type,

1147

domain, protocol, 0,

1148

resolve_callback, mc) == NULL)

1093

1149

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

1094

1150

" %s\n", name,

1095

avahi_strerror(avahi_server_errno(mc.server)));

1151

avahi_strerror(avahi_server_errno

1152

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

1096

1153

break;

1097

1154

1098

1155

case AVAHI_BROWSER_REMOVE:

1117

1174

signal_received = sig;

1118

1175

int old_errno = errno;

1119

1176

/* set main loop to exit */

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1177

if(simple_poll != NULL){

1178

avahi_simple_poll_quit(simple_poll);

1122

1179

}

1123

1180

errno = old_errno;

1124

1181

}

1125

1182

1183

__attribute__((nonnull, warn_unused_result))

1126

1184

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

1127

1185

int ret;

1128

1186

error_t ret_errno;

1147

1205

return true;

1148

1206

}

1149

1207

1208

__attribute__((nonnull, warn_unused_result))

1150

1209

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

1151

1210

1152

1211

/* Reject the loopback device */

1194

1253

* corresponds to an acceptable network device.

1195

1254

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

1196

1255

*/

1256

__attribute__((nonnull, warn_unused_result))

1197

1257

int good_interface(const struct dirent *if_entry){

1198

1258

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

1199

1259

return 0;

1217

1277

/*

1218

1278

* This function determines if a network interface is up.

1219

1279

*/

1280

__attribute__((nonnull, warn_unused_result))

1220

1281

bool interface_is_up(const char *interface){

1221

1282

struct ifreq ifr;

1222

1283

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

1233

1294

/*

1234

1295

* This function determines if a network interface is running

1235

1296

*/

1297

__attribute__((nonnull, warn_unused_result))

1236

1298

bool interface_is_running(const char *interface){

1237

1299

struct ifreq ifr;

1238

1300

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

1246

1308

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

1247

1309

}

1248

1310

1311

__attribute__((nonnull, pure, warn_unused_result))

1249

1312

int notdotentries(const struct dirent *direntry){

1250

1313

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

1251

1314

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

1258

1321

}

1259

1322

1260

1323

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

1324

__attribute__((nonnull, warn_unused_result))

1261

1325

int runnable_hook(const struct dirent *direntry){

1262

1326

int ret;

1263

1327

size_t sret;

1318

1382

return 1;

1319

1383

}

1320

1384

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1385

__attribute__((nonnull, warn_unused_result))

1386

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1387

mandos_context *mc){

1322

1388

int ret;

1323

1389

struct timespec now;

1324

1390

struct timespec waited_time;

1325

1391

intmax_t block_time;

1326

1392

1327

1393

while(true){

1328

if(mc.current_server == NULL){

1329

if (debug){

1394

if(mc->current_server == NULL){

1395

if(debug){

1330

1396

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

1331

1397

" No timeout!\n");

1332

1398

}

1333

1399

ret = avahi_simple_poll_iterate(s, -1);

1334

1400

} else {

1335

if (debug){

1401

if(debug){

1336

1402

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

1337

1403

" it, or wait\n");

1338

1404

}

1345

1411

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

1346

1412

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

1347

1413

waited_time.tv_sec = (now.tv_sec

1348

- mc.current_server->last_seen.tv_sec);

1414

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

1349

1415

waited_time.tv_nsec = (now.tv_nsec

1350

- mc.current_server->last_seen.tv_nsec);

1416

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

1351

1417

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

1352

1418

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

1353

1419

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

1355

1421

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

1356

1422

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

1357

1423

1358

if (debug){

1424

if(debug){

1359

1425

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

1360

1426

block_time);

1361

1427

}

1362

1428

1363

1429

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);

1430

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

1431

mc->current_server->port,

1432

mc->current_server->if_index,

1433

mc->current_server->af, mc);

1368

1434

if(ret == 0){

1369

avahi_simple_poll_quit(mc.simple_poll);

1435

avahi_simple_poll_quit(s);

1370

1436

return 0;

1371

1437

}

1372

1438

ret = clock_gettime(CLOCK_MONOTONIC,

1373

&mc.current_server->last_seen);

1439

&mc->current_server->last_seen);

1374

1440

if(ret == -1){

1375

1441

perror_plus("clock_gettime");

1376

1442

return -1;

1377

1443

}

1378

mc.current_server = mc.current_server->next;

1444

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

1379

1445

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

1380

1446

servers, but don't block */

1381

1447

}

1383

1449

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

1384

1450

}

1385

1451

if(ret != 0){

1386

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

1452

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

1387

1453

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

1388

1454

}

1389

1455

}

1391

1457

}

1392

1458

1393

1459

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

1460

__attribute__((warn_unused_result))

1394

1461

error_t raise_privileges(void){

1395

1462

error_t old_errno = errno;

1396

1463

error_t ret_errno = 0;

1403

1470

}

1404

1471

1405

1472

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

1473

__attribute__((warn_unused_result))

1406

1474

error_t raise_privileges_permanently(void){

1407

1475

error_t old_errno = errno;

1408

1476

error_t ret_errno = raise_privileges();

1419

1487

}

1420

1488

1421

1489

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

1490

__attribute__((warn_unused_result))

1422

1491

error_t lower_privileges(void){

1423

1492

error_t old_errno = errno;

1424

1493

error_t ret_errno = 0;

1431

1500

}

1432

1501

1433

1502

/* Lower privileges permanently */

1503

__attribute__((warn_unused_result))

1434

1504

error_t lower_privileges_permanently(void){

1435

1505

error_t old_errno = errno;

1436

1506

error_t ret_errno = 0;

1442

1512

return ret_errno;

1443

1513

}

1444

1514

1445

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

1515

__attribute__((nonnull))

1516

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

1446

1517

const float delay){

1447

1518

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

1519

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

1451

1520

alphasort);

1452

1521

if(numhooks == -1){

1453

perror_plus("scandir");

1522

if(errno == ENOENT){

1523

if(debug){

1524

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

1525

" found\n", hookdir);

1526

}

1527

} else {

1528

perror_plus("scandir");

1529

}

1454

1530

} else {

1531

struct dirent *direntry;

1532

int ret;

1455

1533

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

1456

1534

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

1457

1535

direntry = direntries[i];

1469

1547

if(hook_pid == 0){

1470

1548

/* Child */

1471

1549

/* Raise privileges */

1472

raise_privileges_permanently();

1550

if(raise_privileges_permanently() != 0){

1551

perror_plus("Failed to raise privileges");

1552

_exit(EX_NOPERM);

1553

}

1473

1554

/* Set group */

1474

1555

errno = 0;

1475

1556

ret = setgid(0);

1476

1557

if(ret == -1){

1477

1558

perror_plus("setgid");

1559

_exit(EX_NOPERM);

1478

1560

}

1479

1561

/* Reset supplementary groups */

1480

1562

errno = 0;

1481

1563

ret = setgroups(0, NULL);

1482

1564

if(ret == -1){

1483

1565

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1566

_exit(EX_NOPERM);

1567

}

1568

ret = dup2(devnull, STDIN_FILENO);

1569

if(ret == -1){

1570

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

1571

_exit(EX_OSERR);

1572

}

1573

ret = close(devnull);

1574

if(ret == -1){

1575

perror_plus("close");

1576

_exit(EX_OSERR);

1577

}

1578

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1579

if(ret == -1){

1580

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

1581

_exit(EX_OSERR);

1582

}

1488

1583

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

1489

1584

if(ret == -1){

1490

1585

perror_plus("setenv");

1506

1601

_exit(EX_OSERR);

1507

1602

}

1508

1603

char *delaystring;

1509

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

1604

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

1510

1605

if(ret == -1){

1511

1606

perror_plus("asprintf");

1512

1607

_exit(EX_OSERR);

1565

1660

}

1566

1661

close(devnull);

1567

1662

}

1568

return true;

1569

1663

}

1570

1664

1665

__attribute__((nonnull, warn_unused_result))

1571

1666

error_t bring_up_interface(const char *const interface,

1572

1667

const float delay){

1573

int sd = -1;

1574

1668

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1669

int ret;

1577

1670

struct ifreq network;

1578

1671

unsigned int if_index = if_nametoindex(interface);

1579

1672

if(if_index == 0){

1588

1681

}

1589

1682

1590

1683

if(not interface_is_up(interface)){

1591

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

1684

error_t ret_errno = 0, ioctl_errno = 0;

1685

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

1592

1686

ret_errno = errno;

1593

1687

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

1594

1688

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

1689

errno = old_errno;

1595

1690

return ret_errno;

1596

1691

}

1597

network.ifr_flags |= IFF_UP;

1692

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

1598

1693

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1694

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

1695

if(sd == -1){

1601

1696

ret_errno = errno;

1602

1697

perror_plus("socket");

1603

1698

errno = old_errno;

1604

1699

return ret_errno;

1605

1700

}

1606

1701

1607

1702

if(quit_now){

1608

close(sd);

1703

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

1704

if(ret == -1){

1705

perror_plus("close");

1706

}

1609

1707

errno = old_errno;

1610

1708

return EINTR;

1611

1709

}

1615

1713

interface);

1616

1714

}

1617

1715

1618

/* Raise priviliges */

1619

raise_privileges();

1620

1716

/* Raise privileges */

1717

ret_errno = raise_privileges();

1718

bool restore_loglevel = false;

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1621

1722

#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");

1723

int ret_linux;

1724

if(ret_errno == 0){

1725

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1726

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

1727

ret_linux = klogctl(8, NULL, 5);

1728

if(ret_linux == -1){

1729

perror_plus("klogctl");

1730

} else {

1731

restore_loglevel = true;

1732

}

1629

1733

}

1630

1734

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

1735

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

1736

ioctl_errno = errno;

1633

1737

#ifdef __linux__

1634

1738

if(restore_loglevel){

1635

1739

ret_linux = klogctl(7, NULL, 0);

1639

1743

}

1640

1744

#endif /* __linux__ */

1641

1745

1642

/* Lower privileges */

1643

lower_privileges();

1746

/* If raise_privileges() succeeded above */

1747

if(ret_errno == 0){

1748

/* Lower privileges */

1749

ret_errno = lower_privileges();

1750

if(ret_errno != 0){

1751

errno = ret_errno;

1752

perror_plus("Failed to lower privileges");

1753

}

1754

}

1644

1755

1645

1756

/* Close the socket */

1646

1757

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

1649

1760

}

1650

1761

1651

1762

if(ret_setflags == -1){

1652

errno = ret_errno;

1763

errno = ioctl_errno;

1653

1764

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

1765

errno = old_errno;

1655

return ret_errno;

1766

return ioctl_errno;

1656

1767

}

1657

1768

} else if(debug){

1658

1769

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

1676

1787

return 0;

1677

1788

}

1678

1789

1790

__attribute__((nonnull, warn_unused_result))

1679

1791

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

1792

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1684

1793

struct ifreq network;

1685

1794

unsigned int if_index = if_nametoindex(interface);

1686

1795

if(if_index == 0){

1689

1798

return ENXIO;

1690

1799

}

1691

1800

if(interface_is_up(interface)){

1801

error_t ret_errno = 0, ioctl_errno = 0;

1692

1802

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

1693

1803

ret_errno = errno;

1694

1804

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

1695

1805

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

1806

errno = old_errno;

1696

1807

return ret_errno;

1697

1808

}

1698

1809

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

1699

1810

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1811

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

1812

if(sd == -1){

1702

1813

ret_errno = errno;

1703

1814

perror_plus("socket");

1704

1815

errno = old_errno;

1710

1821

interface);

1711

1822

}

1712

1823

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();

1824

/* Raise privileges */

1825

ret_errno = raise_privileges();

1826

if(ret_errno != 0){

1827

perror_plus("Failed to raise privileges");

1828

}

1829

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

1830

ioctl_errno = errno;

1831

1832

/* If raise_privileges() succeeded above */

1833

if(ret_errno == 0){

1834

/* Lower privileges */

1835

ret_errno = lower_privileges();

1836

if(ret_errno != 0){

1837

errno = ret_errno;

1838

perror_plus("Failed to lower privileges");

1839

}

1840

}

1721

1841

1722

1842

/* Close the socket */

1723

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

1843

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

1724

1844

if(ret == -1){

1725

1845

perror_plus("close");

1726

1846

}

1727

1847

1728

1848

if(ret_setflags == -1){

1729

errno = ret_errno;

1849

errno = ioctl_errno;

1730

1850

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

1851

errno = old_errno;

1732

return ret_errno;

1852

return ioctl_errno;

1733

1853

}

1734

1854

} else if(debug){

1735

1855

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

1741

1861

}

1742

1862

1743

1863

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

1864

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

1865

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

1866

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

1867

.interfaces = NULL, .interfaces_size = 0 };

1744

1868

AvahiSServiceBrowser *sb = NULL;

1745

1869

error_t ret_errno;

1746

1870

int ret;

1747

1871

intmax_t tmpmax;

1748

1872

char *tmp;

1749

1873

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

1874

char *interfaces_to_take_down = NULL;

1753

1875

size_t interfaces_to_take_down_size = 0;

1754

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

1755

bool tempdir_created = false;

1876

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

1877

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

1878

char *tempdir = NULL;

1756

1879

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1757

1880

const char *seckey = PATHDIR "/" SECKEY;

1758

1881

const char *pubkey = PATHDIR "/" PUBKEY;

1759

1882

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1761

1883

1762

1884

bool gnutls_initialized = false;

1763

1885

bool gpgme_initialized = false;

1854

1976

connect_to = arg;

1855

1977

break;

1856

1978

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

1857

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

1858

(int)',');

1979

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

1980

arg, (int)',');

1859

1981

if(ret_errno != 0){

1860

1982

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

1861

1983

}

1941

2063

/* Work around Debian bug #633582:

1942

2064

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

1943

2065

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2066

/* Re-raise privileges */

2067

ret_errno = raise_privileges();

2068

if(ret_errno != 0){

2069

errno = ret_errno;

2070

perror_plus("Failed to raise privileges");

2071

} else {

1946

2072

struct stat st;

1947

2073

1948

2074

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

1988

2114

}

1989

2115

1990

2116

/* Lower privileges */

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2117

ret_errno = lower_privileges();

2118

if(ret_errno != 0){

2119

errno = ret_errno;

2120

perror_plus("Failed to lower privileges");

1995

2121

}

1996

2122

}

1997

2123

}

1998

2124

1999

/* Remove empty interface names */

2125

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

2000

2126

{

2001

2127

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2128

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

2003

2129

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

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

2130

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

2131

and if_nametoindex(interface) == 0){

2132

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

2006

2133

fprintf_plus(stderr, "Not using nonexisting interface"

2007

2134

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

2008

2135

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2136

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

2010

2137

interface = NULL;

2011

2138

}

2012

2139

}

2014

2141

2015

2142

/* Run network hooks */

2016

2143

{

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

}

2144

if(mc.interfaces != NULL){

2145

interfaces_hooks = malloc(mc.interfaces_size);

2146

if(interfaces_hooks == NULL){

2147

perror_plus("malloc");

2148

goto end;

2149

}

2150

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

2151

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

2152

}

2153

run_network_hooks("start", interfaces_hooks != NULL ?

2154

interfaces_hooks : "", delay);

2028

2155

}

2029

2156

2030

2157

if(not debug){

2035

2162

from the signal handler */

2036

2163

/* Initialize the pseudo-RNG for Avahi */

2037

2164

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

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2165

simple_poll = avahi_simple_poll_new();

2166

if(simple_poll == NULL){

2040

2167

fprintf_plus(stderr,

2041

2168

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

2042

2169

exitcode = EX_UNAVAILABLE;

2107

2234

}

2108

2235

2109

2236

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

2110

if(interfaces == NULL){

2237

if(mc.interfaces == NULL){

2111

2238

struct dirent **direntries;

2112

2239

/* Look for any good interfaces */

2113

2240

ret = scandir(sys_class_net, &direntries, good_interface,

2115

2242

if(ret >= 1){

2116

2243

/* Add all found interfaces to interfaces list */

2117

2244

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2245

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

2119

2246

direntries[i]->d_name);

2120

2247

if(ret_errno != 0){

2248

errno = ret_errno;

2121

2249

perror_plus("argz_add");

2122

2250

continue;

2123

2251

}

2135

2263

}

2136

2264

}

2137

2265

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)){

2266

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

2267

{

2150

2268

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2269

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

2152

2270

interface))){

2271

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

2272

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

2273

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

2274

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

2275

interface);

2276

interface = NULL;

2277

while((interface = argz_next(mc.interfaces,

2278

mc.interfaces_size, interface))){

2279

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

2280

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

2281

interface);

2282

interface = NULL;

2283

}

2284

}

2285

break;

2286

}

2153

2287

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2288

errno = bring_up_interface(interface, delay);

2155

2289

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2290

if(errno != 0){

2158

2291

perror_plus("Failed to bring up interface");

2159

2292

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2293

errno = argz_add(&interfaces_to_take_down,

2294

&interfaces_to_take_down_size,

2295

interface);

2296

if(errno != 0){

2297

perror_plus("argz_add");

2298

}

2163

2299

}

2164

2300

}

2165

2301

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

2302

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

2170

2303

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

2171

2304

}

2172

2305

}

2173

2306

2307

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

2308

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

2309

if(debug){

2310

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

2311

mc.interfaces);

2312

}

2313

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

2314

}

2315

2174

2316

if(quit_now){

2175

2317

goto end;

2176

2318

}

2177

2319

2178

ret = init_gnutls_global(pubkey, seckey);

2320

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

2179

2321

if(ret == -1){

2180

2322

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

2181

2323

exitcode = EX_UNAVAILABLE;

2188

2330

goto end;

2189

2331

}

2190

2332

2191

if(mkdtemp(tempdir) == NULL){

2333

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

2334

tempdir = mkdtemp(run_tempdir);

2335

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

2336

if(debug){

2337

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

2338

run_tempdir, old_tempdir);

2339

}

2340

tempdir = mkdtemp(old_tempdir);

2341

}

2342

if(tempdir == NULL){

2192

2343

perror_plus("mkdtemp");

2193

2344

goto end;

2194

2345

}

2195

tempdir_created = true;

2196

2346

2197

2347

if(quit_now){

2198

2348

goto end;

2199

2349

}

2200

2350

2201

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

2351

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

2202

2352

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

2203

2353

exitcode = EX_UNAVAILABLE;

2204

2354

goto end;

2225

2375

goto end;

2226

2376

}

2227

2377

2228

uint16_t port;

2378

in_port_t port;

2229

2379

errno = 0;

2230

2380

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

2231

2381

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

2232

or tmpmax != (uint16_t)tmpmax){

2382

or tmpmax != (in_port_t)tmpmax){

2233

2383

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

2234

2384

exitcode = EX_USAGE;

2235

2385

goto end;

2236

2386

}

2237

2387

2238

2388

if(quit_now){

2239

2389

goto end;

2240

2390

}

2241

2391

2242

port = (uint16_t)tmpmax;

2392

port = (in_port_t)tmpmax;

2243

2393

*address = '\0';

2244

2394

/* Colon in address indicates IPv6 */

2245

2395

int af;

2261

2411

}

2262

2412

2263

2413

while(not quit_now){

2264

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

2414

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

2415

&mc);

2265

2416

if(quit_now or ret == 0){

2266

2417

break;

2267

2418

}

2269

2420

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

2270

2421

(int)retry_interval);

2271

2422

}

2272

sleep((int)retry_interval);

2423

sleep((unsigned int)retry_interval);

2273

2424

}

2274

2425

2275

if (not quit_now){

2426

if(not quit_now){

2276

2427

exitcode = EXIT_SUCCESS;

2277

2428

}

2278

2429

2293

2444

config.publish_domain = 0;

2294

2445

2295

2446

/* Allocate a new server */

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2447

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2448

&config, NULL, NULL, &ret_errno);

2299

2449

2300

2450

/* Free the Avahi configuration data */

2301

2451

avahi_server_config_free(&config);

2316

2466

/* Create the Avahi service browser */

2317

2467

sb = avahi_s_service_browser_new(mc.server, if_index,

2318

2468

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2319

NULL, 0, browse_callback, NULL);

2469

NULL, 0, browse_callback,

2470

(void *)&mc);

2320

2471

if(sb == NULL){

2321

2472

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

2322

2473

avahi_strerror(avahi_server_errno(mc.server)));

2334

2485

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

2335

2486

}

2336

2487

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2488

ret = avahi_loop_with_timeout(simple_poll,

2489

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

2339

2490

if(debug){

2340

2491

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

2341

2492

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

2348

2499

}

2349

2500

2350

2501

/* Cleanup things */

2502

free(mc.interfaces);

2503

2351

2504

if(sb != NULL)

2352

2505

avahi_s_service_browser_free(sb);

2353

2506

2354

2507

if(mc.server != NULL)

2355

2508

avahi_server_free(mc.server);

2356

2509

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2510

if(simple_poll != NULL)

2511

avahi_simple_poll_free(simple_poll);

2359

2512

2360

2513

if(gnutls_initialized){

2361

2514

gnutls_certificate_free_credentials(mc.cred);

2378

2531

}

2379

2532

}

2380

2533

2381

/* Re-raise priviliges */

2534

/* Re-raise privileges */

2382

2535

{

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();

2536

ret_errno = raise_privileges();

2537

if(ret_errno != 0){

2538

perror_plus("Failed to raise privileges");

2539

} else {

2540

2541

/* Run network hooks */

2542

run_network_hooks("stop", interfaces_hooks != NULL ?

2543

interfaces_hooks : "", delay);

2544

2545

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

2546

{

2547

char *interface = NULL;

2548

while((interface=argz_next(interfaces_to_take_down,

2549

interfaces_to_take_down_size,

2550

interface))){

2551

ret_errno = take_down_interface(interface);

2552

if(ret_errno != 0){

2553

errno = ret_errno;

2554

perror_plus("Failed to take down interface");

2555

}

2556

}

2557

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

2558

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

2559

" down\n");

2560

}

2561

}

2562

}

2563

ret_errno = lower_privileges_permanently();

2564

if(ret_errno != 0){

2565

perror_plus("Failed to lower privileges permanently");

2566

}

2407

2567

}

2408

2568

2409

2569

free(interfaces_to_take_down);

2410

2570

free(interfaces_hooks);

2411

2571

2412

2572

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

2413

if(tempdir_created){

2573

if(tempdir != NULL){

2414

2574

struct dirent **direntries = NULL;

2415

2575

struct dirent *direntry = NULL;

2416

2576

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

2417

2577

alphasort);

2418

if (numentries > 0){

2578

if(numentries > 0){

2419

2579

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

2420

2580

direntry = direntries[i];

2421

2581

char *fullname = NULL;

2436

2596

2437

2597

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

2438

2598

free(direntries);

2439

if (numentries == -1){

2599

if(numentries == -1){

2440

2600

perror_plus("scandir");

2441

2601

}

2442

2602

ret = rmdir(tempdir);