/mandos/trunk : revision 477

9

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

10

*

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* Everything else is

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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

30

*/

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32

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

33

#ifndef _LARGEFILE_SOURCE

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34

#define _LARGEFILE_SOURCE

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#endif

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#ifndef _FILE_OFFSET_BITS

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37

#define _FILE_OFFSET_BITS 64

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#endif

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40

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

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

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stdout, ferror(), sscanf(),

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remove() */

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stdout, ferror(), remove() */

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

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

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

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srand() */

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

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strtof(), abort() */

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#include <stdbool.h> /* bool, false, true */

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#include <string.h> /* memset(), strcmp(), strlen(),

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strerror(), asprintf(), strcpy() */

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

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60

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

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*/

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

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

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strtoimax() */

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

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

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

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

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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

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SIOCSIFFLAGS, if_indextoname(),

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if_nametoindex(), IF_NAMESIZE */

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INET_ADDRSTRLEN, INET6_ADDRSTRLEN

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72

*/

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

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getuid(), getgid(), setuid(),

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setgid() */

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

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setgid(), pause() */

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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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argp_parse(), ARGP_KEY_ARG,

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ARGP_KEY_END, ARGP_ERR_UNKNOWN */

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#include <signal.h> /* sigemptyset(), sigaddset(),

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sigaction(), SIGTERM, sig_atomic_t,

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raise() */

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#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

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EX_NOHOST, EX_IOERR, EX_PROTOCOL */

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88

#ifdef __linux__

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89

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

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#endif

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#endif /* __linux__ */

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91

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/* Avahi */

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/* All Avahi types, constants and functions

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127

static const char mandos_protocol_version[] = "1";

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128

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

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129

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

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

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char *connect_to = NULL;

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132

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

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typedef struct {

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141

gpgme_ctx_t ctx;

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} mandos_context;

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143

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

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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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149

sig_atomic_t quit_now = 0;

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int signal_received = 0;

151

132

152

/*

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* Make room in "buffer" for at least BUFFER_SIZE additional bytes.

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* "buffer_capacity" is how much is currently allocated,

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* Make additional room in "buffer" for at least BUFFER_SIZE more

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

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* "buffer_length" is how much is already used.

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*/

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size_t adjustbuffer(char **buffer, size_t buffer_length,

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size_t incbuffer(char **buffer, size_t buffer_length,

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size_t buffer_capacity){

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if(buffer_length + BUFFER_SIZE > buffer_capacity){

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

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169

/*

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* Initialize GPGME.

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*/

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static bool init_gpgme(mandos_context *mc, const char *seckey,

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static bool init_gpgme(const char *seckey,

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const char *pubkey, const char *tempdir){

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int ret;

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174

gpgme_error_t rc;

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175

gpgme_engine_info_t engine_info;

157

176

160

179

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

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*/

162

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bool import_key(const char *filename){

182

int ret;

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int fd;

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184

gpgme_data_t pgp_data;

165

185

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196

return false;

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197

}

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

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rc = gpgme_op_import(mc.ctx, pgp_data);

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if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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}

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if(debug){

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fprintf(stderr, "Initialize gpgme\n");

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fprintf(stderr, "Initializing GPGME\n");

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}

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/* Init GPGME */

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245

}

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246

227

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/* Create new GPGME "context" */

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

248

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

229

249

if(rc != GPG_ERR_NO_ERROR){

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fprintf(stderr, "bad gpgme_new: %s: %s\n",

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gpgme_strsource(rc), gpgme_strerror(rc));

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256

return false;

237

257

}

238

258

239

return true;

259

return true;

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260

}

241

261

242

262

/*

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263

* Decrypt OpenPGP data.

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* Returns -1 on error

245

265

*/

246

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

247

const char *cryptotext,

266

static ssize_t pgp_packet_decrypt(const char *cryptotext,

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267

size_t crypto_size,

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268

char **plaintext){

250

269

gpgme_data_t dh_crypto, dh_plain;

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296

278

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

279

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data buffer */

280

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

299

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

281

300

if(rc != GPG_ERR_NO_ERROR){

282

301

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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plaintext_length = -1;

285

304

if(debug){

286

305

gpgme_decrypt_result_t result;

287

result = gpgme_op_decrypt_result(mc->ctx);

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result = gpgme_op_decrypt_result(mc.ctx);

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if(result == NULL){

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

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} else {

297

316

}

298

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gpgme_recipient_t recipient;

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recipient = result->recipients;

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if(recipient){

301

while(recipient != NULL){

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fprintf(stderr, "Public key algorithm: %s\n",

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gpgme_pubkey_algo_name(recipient->pubkey_algo));

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fprintf(stderr, "Key ID: %s\n", recipient->keyid);

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fprintf(stderr, "Secret key available: %s\n",

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recipient->status == GPG_ERR_NO_SECKEY

307

? "No" : "Yes");

308

recipient = recipient->next;

309

}

319

while(recipient != NULL){

320

fprintf(stderr, "Public key algorithm: %s\n",

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

323

fprintf(stderr, "Secret key available: %s\n",

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

326

recipient = recipient->next;

310

327

}

311

328

}

312

329

}

326

343

327

344

*plaintext = NULL;

328

345

while(true){

329

plaintext_capacity = adjustbuffer(plaintext,

346

plaintext_capacity = incbuffer(plaintext,

330

347

(size_t)plaintext_length,

331

348

plaintext_capacity);

332

349

if(plaintext_capacity == 0){

333

perror("adjustbuffer");

350

perror("incbuffer");

334

351

plaintext_length = -1;

335

352

goto decrypt_end;

336

353

}

382

399

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

383

400

}

384

401

385

static int init_gnutls_global(mandos_context *mc,

386

const char *pubkeyfilename,

402

static int init_gnutls_global(const char *pubkeyfilename,

387

403

const char *seckeyfilename){

388

404

int ret;

389

405

407

423

}

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424

409

425

/* OpenPGP credentials */

410

gnutls_certificate_allocate_credentials(&mc->cred);

426

gnutls_certificate_allocate_credentials(&mc.cred);

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427

if(ret != GNUTLS_E_SUCCESS){

412

428

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

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from

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441

}

426

442

427

443

ret = gnutls_certificate_set_openpgp_key_file

428

(mc->cred, pubkeyfilename, seckeyfilename,

444

(mc.cred, pubkeyfilename, seckeyfilename,

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445

GNUTLS_OPENPGP_FMT_BASE64);

430

446

if(ret != GNUTLS_E_SUCCESS){

431

447

fprintf(stderr,

437

453

}

438

454

439

455

/* GnuTLS server initialization */

440

ret = gnutls_dh_params_init(&mc->dh_params);

456

ret = gnutls_dh_params_init(&mc.dh_params);

441

457

if(ret != GNUTLS_E_SUCCESS){

442

458

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

443

459

" %s\n", safer_gnutls_strerror(ret));

444

460

goto globalfail;

445

461

}

446

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

462

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

447

463

if(ret != GNUTLS_E_SUCCESS){

448

464

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

449

465

safer_gnutls_strerror(ret));

450

466

goto globalfail;

451

467

}

452

468

453

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

469

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

454

470

455

471

return 0;

456

472

457

473

globalfail:

458

474

459

gnutls_certificate_free_credentials(mc->cred);

475

gnutls_certificate_free_credentials(mc.cred);

460

476

gnutls_global_deinit();

461

gnutls_dh_params_deinit(mc->dh_params);

477

gnutls_dh_params_deinit(mc.dh_params);

462

478

return -1;

463

479

}

464

480

465

static int init_gnutls_session(mandos_context *mc,

466

gnutls_session_t *session){

481

static int init_gnutls_session(gnutls_session_t *session){

467

482

int ret;

468

483

/* GnuTLS session creation */

469

ret = gnutls_init(session, GNUTLS_SERVER);

484

do {

485

ret = gnutls_init(session, GNUTLS_SERVER);

486

if(quit_now){

487

return -1;

488

}

489

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

470

490

if(ret != GNUTLS_E_SUCCESS){

471

491

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

472

492

safer_gnutls_strerror(ret));

474

494

475

495

{

476

496

const char *err;

477

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

497

do {

498

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

499

if(quit_now){

500

gnutls_deinit(*session);

501

return -1;

502

}

503

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

478

504

if(ret != GNUTLS_E_SUCCESS){

479

505

fprintf(stderr, "Syntax error at: %s\n", err);

480

506

fprintf(stderr, "GnuTLS error: %s\n",

484

510

}

485

511

}

486

512

487

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

488

mc->cred);

513

do {

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

516

if(quit_now){

517

gnutls_deinit(*session);

518

return -1;

519

}

520

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

489

521

if(ret != GNUTLS_E_SUCCESS){

490

522

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

491

523

safer_gnutls_strerror(ret));

494

526

}

495

527

496

528

/* ignore client certificate if any. */

497

gnutls_certificate_server_set_request(*session,

498

GNUTLS_CERT_IGNORE);

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

499

530

500

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

501

532

502

533

return 0;

503

534

}

509

540

/* Called when a Mandos server is found */

510

541

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

511

542

AvahiIfIndex if_index,

512

mandos_context *mc, int af){

513

int ret, tcp_sd;

543

int af){

544

int ret, tcp_sd = -1;

514

545

ssize_t sret;

515

546

union {

516

547

struct sockaddr_in in;

517

548

struct sockaddr_in6 in6;

518

549

} to;

519

550

char *buffer = NULL;

520

char *decrypted_buffer;

551

char *decrypted_buffer = NULL;

521

552

size_t buffer_length = 0;

522

553

size_t buffer_capacity = 0;

523

ssize_t decrypted_buffer_size;

524

554

size_t written;

525

int retval = 0;

555

int retval = -1;

526

556

gnutls_session_t session;

527

557

int pf; /* Protocol family */

528

558

559

errno = 0;

560

561

if(quit_now){

562

errno = EINTR;

563

return -1;

564

}

565

529

566

switch(af){

530

567

case AF_INET6:

531

568

pf = PF_INET6;

535

572

break;

536

573

default:

537

574

fprintf(stderr, "Bad address family: %d\n", af);

575

errno = EINVAL;

538

576

return -1;

539

577

}

540

578

541

ret = init_gnutls_session(mc, &session);

579

ret = init_gnutls_session(&session);

542

580

if(ret != 0){

543

581

return -1;

544

582

}

550

588

551

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

552

590

if(tcp_sd < 0){

591

int e = errno;

553

592

perror("socket");

554

return -1;

593

errno = e;

594

goto mandos_end;

595

}

596

597

if(quit_now){

598

errno = EINTR;

599

goto mandos_end;

555

600

}

556

601

557

602

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

558

603

if(af == AF_INET6){

559

to.in6.sin6_family = (uint16_t)af;

604

to.in6.sin6_family = (sa_family_t)af;

560

605

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

561

606

} else { /* IPv4 */

562

607

to.in.sin_family = (sa_family_t)af;

563

608

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

564

609

}

565

610

if(ret < 0 ){

611

int e = errno;

566

612

perror("inet_pton");

567

return -1;

613

errno = e;

614

goto mandos_end;

568

615

}

569

616

if(ret == 0){

617

int e = errno;

570

618

fprintf(stderr, "Bad address: %s\n", ip);

571

return -1;

619

errno = e;

620

goto mandos_end;

572

621

}

573

622

if(af == AF_INET6){

574

623

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

581

630

if(if_index == AVAHI_IF_UNSPEC){

582

631

fprintf(stderr, "An IPv6 link-local address is incomplete"

583

632

" without a network interface\n");

584

return -1;

633

errno = EINVAL;

634

goto mandos_end;

585

635

}

586

636

/* Set the network interface number as scope */

587

637

to.in6.sin6_scope_id = (uint32_t)if_index;

592

642

-Wunreachable-code */

593

643

}

594

644

645

if(quit_now){

646

errno = EINTR;

647

goto mandos_end;

648

}

649

595

650

if(debug){

596

651

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

597

652

char interface[IF_NAMESIZE];

624

679

}

625

680

}

626

681

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

627

687

if(af == AF_INET6){

628

688

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

629

689

} else {

630

690

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

631

691

}

632

692

if(ret < 0){

633

perror("connect");

634

return -1;

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

698

goto mandos_end;

699

}

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

635

704

}

636

705

637

706

const char *out = mandos_protocol_version;

641

710

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

642

711

out_size - written));

643

712

if(ret == -1){

713

int e = errno;

644

714

perror("write");

645

retval = -1;

715

errno = e;

646

716

goto mandos_end;

647

717

}

648

718

written += (size_t)ret;

656

726

break;

657

727

}

658

728

}

729

730

if(quit_now){

731

errno = EINTR;

732

goto mandos_end;

733

}

659

734

}

660

735

661

736

if(debug){

662

737

fprintf(stderr, "Establishing TLS session with %s\n", ip);

663

738

}

664

739

740

if(quit_now){

741

errno = EINTR;

742

goto mandos_end;

743

}

744

665

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

666

746

667

do{

747

if(quit_now){

748

errno = EINTR;

749

goto mandos_end;

750

}

751

752

do {

668

753

ret = gnutls_handshake(session);

754

if(quit_now){

755

errno = EINTR;

756

goto mandos_end;

757

}

669

758

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

670

759

671

760

if(ret != GNUTLS_E_SUCCESS){

673

762

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

674

763

gnutls_perror(ret);

675

764

}

676

retval = -1;

765

errno = EPROTO;

677

766

goto mandos_end;

678

767

}

679

768

685

774

}

686

775

687

776

while(true){

688

buffer_capacity = adjustbuffer(&buffer, buffer_length,

777

778

if(quit_now){

779

errno = EINTR;

780

goto mandos_end;

781

}

782

783

buffer_capacity = incbuffer(&buffer, buffer_length,

689

784

buffer_capacity);

690

785

if(buffer_capacity == 0){

691

perror("adjustbuffer");

692

retval = -1;

786

int e = errno;

787

perror("incbuffer");

788

errno = e;

789

goto mandos_end;

790

}

791

792

if(quit_now){

793

errno = EINTR;

693

794

goto mandos_end;

694

795

}

695

796

704

805

case GNUTLS_E_AGAIN:

705

806

break;

706

807

case GNUTLS_E_REHANDSHAKE:

707

do{

808

do {

708

809

ret = gnutls_handshake(session);

810

811

if(quit_now){

812

errno = EINTR;

813

goto mandos_end;

814

}

709

815

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

710

816

if(ret < 0){

711

817

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

712

818

gnutls_perror(ret);

713

retval = -1;

819

errno = EPROTO;

714

820

goto mandos_end;

715

821

}

716

822

break;

717

823

default:

718

824

fprintf(stderr, "Unknown error while reading data from"

719

825

" encrypted session with Mandos server\n");

720

retval = -1;

721

826

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

errno = EIO;

722

828

goto mandos_end;

723

829

}

724

830

} else {

730

836

fprintf(stderr, "Closing TLS session\n");

731

837

}

732

838

733

gnutls_bye(session, GNUTLS_SHUT_RDWR);

839

if(quit_now){

840

errno = EINTR;

841

goto mandos_end;

842

}

843

844

do {

845

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

846

if(quit_now){

847

errno = EINTR;

848

goto mandos_end;

849

}

850

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

734

851

735

852

if(buffer_length > 0){

736

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

853

ssize_t decrypted_buffer_size;

854

decrypted_buffer_size = pgp_packet_decrypt(buffer,

737

855

buffer_length,

738

856

&decrypted_buffer);

739

857

if(decrypted_buffer_size >= 0){

858

740

859

written = 0;

741

860

while(written < (size_t) decrypted_buffer_size){

861

if(quit_now){

862

errno = EINTR;

863

goto mandos_end;

864

}

865

742

866

ret = (int)fwrite(decrypted_buffer + written, 1,

743

867

(size_t)decrypted_buffer_size - written,

744

868

stdout);

745

869

if(ret == 0 and ferror(stdout)){

870

int e = errno;

746

871

if(debug){

747

872

fprintf(stderr, "Error writing encrypted data: %s\n",

748

873

strerror(errno));

749

874

}

750

retval = -1;

751

break;

875

errno = e;

876

goto mandos_end;

752

877

}

753

878

written += (size_t)ret;

754

879

}

755

free(decrypted_buffer);

756

} else {

757

retval = -1;

880

retval = 0;

758

881

}

759

} else {

760

retval = -1;

761

882

}

762

883

763

884

/* Shutdown procedure */

764

885

765

886

mandos_end:

766

free(buffer);

767

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

768

if(ret == -1){

769

perror("close");

887

{

888

int e = errno;

889

free(decrypted_buffer);

890

free(buffer);

891

if(tcp_sd >= 0){

892

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

893

}

894

if(ret == -1){

895

if(e == 0){

896

e = errno;

897

}

898

perror("close");

899

}

900

gnutls_deinit(session);

901

if(quit_now){

902

e = EINTR;

903

retval = -1;

904

}

905

errno = e;

770

906

}

771

gnutls_deinit(session);

772

907

return retval;

773

908

}

774

909

785

920

AVAHI_GCC_UNUSED AvahiStringList *txt,

786

921

AVAHI_GCC_UNUSED AvahiLookupResultFlags

787

922

flags,

788

void* userdata){

789

mandos_context *mc = userdata;

923

AVAHI_GCC_UNUSED void* userdata){

790

924

assert(r);

791

925

792

926

/* Called whenever a service has been resolved successfully or

793

927

timed out */

794

928

929

if(quit_now){

930

return;

931

}

932

795

933

switch(event){

796

934

default:

797

935

case AVAHI_RESOLVER_FAILURE:

798

936

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

799

937

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

800

avahi_strerror(avahi_server_errno(mc->server)));

938

avahi_strerror(avahi_server_errno(mc.server)));

801

939

break;

802

940

803

941

case AVAHI_RESOLVER_FOUND:

809

947

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

810

948

ip, (intmax_t)interface, port);

811

949

}

812

int ret = start_mandos_communication(ip, port, interface, mc,

950

int ret = start_mandos_communication(ip, port, interface,

813

951

avahi_proto_to_af(proto));

814

952

if(ret == 0){

815

avahi_simple_poll_quit(mc->simple_poll);

953

avahi_simple_poll_quit(mc.simple_poll);

816

954

}

817

955

}

818

956

}

828

966

const char *domain,

829

967

AVAHI_GCC_UNUSED AvahiLookupResultFlags

830

968

flags,

831

void* userdata){

832

mandos_context *mc = userdata;

969

AVAHI_GCC_UNUSED void* userdata){

833

970

assert(b);

834

971

835

972

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

836

973

is removed from the LAN */

837

974

975

if(quit_now){

976

return;

977

}

978

838

979

switch(event){

839

980

default:

840

981

case AVAHI_BROWSER_FAILURE:

841

982

842

983

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

843

avahi_strerror(avahi_server_errno(mc->server)));

844

avahi_simple_poll_quit(mc->simple_poll);

984

avahi_strerror(avahi_server_errno(mc.server)));

985

avahi_simple_poll_quit(mc.simple_poll);

845

986

return;

846

987

847

988

case AVAHI_BROWSER_NEW:

850

991

the callback function is called the Avahi server will free the

851

992

resolver for us. */

852

993

853

if(!(avahi_s_service_resolver_new(mc->server, interface,

854

protocol, name, type, domain,

855

AVAHI_PROTO_INET6, 0,

856

resolve_callback, mc)))

994

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

995

name, type, domain, protocol, 0,

996

resolve_callback, NULL) == NULL)

857

997

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

858

name, avahi_strerror(avahi_server_errno(mc->server)));

998

name, avahi_strerror(avahi_server_errno(mc.server)));

859

999

break;

860

1000

861

1001

case AVAHI_BROWSER_REMOVE:

870

1010

}

871

1011

}

872

1012

1013

/* stop main loop after sigterm has been called */

1014

static void handle_sigterm(int sig){

1015

if(quit_now){

1016

return;

1017

}

1018

quit_now = 1;

1019

signal_received = sig;

1020

int old_errno = errno;

1021

if(mc.simple_poll != NULL){

1022

avahi_simple_poll_quit(mc.simple_poll);

1023

}

1024

errno = old_errno;

1025

}

1026

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1042

return 0;

1043

}

1044

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1050

/* read line from flags_fd */

1051

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1052

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1053

flagstring[(size_t)to_read] = '\0';

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

tmpmax = strtoimax(flagstring, &tmp, 0);

1078

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

/* Accept point-to-point devices only if connect_to is specified */

1099

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1100

if(debug){

1101

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

/* Otherwise, reject non-broadcast-capable devices */

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1115

if(debug){

1116

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1117

if_entry->d_name);

1118

}

1119

return 1;

1120

}

1121

873

1122

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

874

1123

AvahiSServiceBrowser *sb = NULL;

875

1124

int error;

876

1125

int ret;

877

1126

intmax_t tmpmax;

878

int numchars;

1127

char *tmp;

879

1128

int exitcode = EXIT_SUCCESS;

880

const char *interface = "eth0";

1129

const char *interface = "";

881

1130

struct ifreq network;

882

int sd;

1131

int sd = -1;

1132

bool take_down_interface = false;

883

1133

uid_t uid;

884

1134

gid_t gid;

885

char *connect_to = NULL;

886

1135

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

887

1136

bool tempdir_created = false;

888

1137

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

889

1138

const char *seckey = PATHDIR "/" SECKEY;

890

1139

const char *pubkey = PATHDIR "/" PUBKEY;

891

1140

892

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

893

.dh_bits = 1024, .priority = "SECURE256"

894

":!CTYPE-X.509:+CTYPE-OPENPGP" };

895

1141

bool gnutls_initialized = false;

896

1142

bool gpgme_initialized = false;

897

double delay = 2.5;

1143

float delay = 2.5f;

1144

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

/* Lower any group privileges we might have, just to be safe */

1152

errno = 0;

1153

ret = setgid(gid);

1154

if(ret == -1){

1155

perror("setgid");

1156

}

1157

1158

/* Lower user privileges (temporarily) */

1159

errno = 0;

1160

ret = seteuid(uid);

1161

if(ret == -1){

1162

perror("seteuid");

1163

}

1164

1165

if(quit_now){

1166

goto end;

1167

}

898

1168

899

1169

{

900

1170

struct argp_option options[] = {

930

1200

.arg = "SECONDS",

931

1201

.doc = "Maximum delay to wait for interface startup",

932

1202

.group = 2 },

1203

/*

1204

* These reproduce what we would get without ARGP_NO_HELP

1205

*/

1206

{ .name = "help", .key = '?',

1207

.doc = "Give this help list", .group = -1 },

1208

{ .name = "usage", .key = -3,

1209

.doc = "Give a short usage message", .group = -1 },

1210

{ .name = "version", .key = 'V',

1211

.doc = "Print program version", .group = -1 },

933

1212

{ .name = NULL }

934

1213

};

935

1214

936

1215

error_t parse_opt(int key, char *arg,

937

1216

struct argp_state *state){

1217

errno = 0;

938

1218

switch(key){

939

1219

case 128: /* --debug */

940

1220

debug = true;

952

1232

pubkey = arg;

953

1233

break;

954

1234

case 129: /* --dh-bits */

955

ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);

956

if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax

957

or arg[numchars] != '\0'){

958

fprintf(stderr, "Bad number of DH bits\n");

959

exit(EXIT_FAILURE);

1235

errno = 0;

1236

tmpmax = strtoimax(arg, &tmp, 10);

1237

if(errno != 0 or tmp == arg or *tmp != '\0'

1238

or tmpmax != (typeof(mc.dh_bits))tmpmax){

1239

argp_error(state, "Bad number of DH bits");

960

1240

}

961

1241

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

962

1242

break;

964

1244

mc.priority = arg;

965

1245

break;

966

1246

case 131: /* --delay */

967

ret = sscanf(arg, "%lf%n", &delay, &numchars);

968

if(ret < 1 or arg[numchars] != '\0'){

969

fprintf(stderr, "Bad delay\n");

970

exit(EXIT_FAILURE);

1247

errno = 0;

1248

delay = strtof(arg, &tmp);

1249

if(errno != 0 or tmp == arg or *tmp != '\0'){

1250

argp_error(state, "Bad delay");

971

1251

}

972

1252

break;

973

case ARGP_KEY_ARG:

974

argp_usage(state);

975

case ARGP_KEY_END:

1253

/*

1254

* These reproduce what we would get without ARGP_NO_HELP

1255

*/

1256

case '?': /* --help */

1257

argp_state_help(state, state->out_stream,

1258

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1259

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1260

case -3: /* --usage */

1261

argp_state_help(state, state->out_stream,

1262

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

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

1264

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

1265

exit(argp_err_exit_status);

976

1266

break;

977

1267

default:

978

1268

return ARGP_ERR_UNKNOWN;

979

1269

}

980

return 0;

1270

return errno;

981

1271

}

982

1272

983

1273

struct argp argp = { .options = options, .parser = parse_opt,

984

1274

.args_doc = "",

985

1275

.doc = "Mandos client -- Get and decrypt"

986

1276

" passwords from a Mandos server" };

987

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

988

if(ret == ARGP_ERR_UNKNOWN){

989

fprintf(stderr, "Unknown error while parsing arguments\n");

1277

ret = argp_parse(&argp, argc, argv,

1278

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1279

switch(ret){

1280

case 0:

1281

break;

1282

case ENOMEM:

1283

default:

1284

errno = ret;

1285

perror("argp_parse");

1286

exitcode = EX_OSERR;

1287

goto end;

1288

case EINVAL:

1289

exitcode = EX_USAGE;

1290

goto end;

1291

}

1292

}

1293

1294

if(not debug){

1295

avahi_set_log_function(empty_log);

1296

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

990

1318

exitcode = EXIT_FAILURE;

991

1319

goto end;

992

1320

}

993

1321

}

994

1322

1323

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

1324

from the signal handler */

1325

/* Initialize the pseudo-RNG for Avahi */

1326

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

1327

mc.simple_poll = avahi_simple_poll_new();

1328

if(mc.simple_poll == NULL){

1329

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1330

exitcode = EX_UNAVAILABLE;

1331

goto end;

1332

}

1333

1334

sigemptyset(&sigterm_action.sa_mask);

1335

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1336

if(ret == -1){

1337

perror("sigaddset");

1338

exitcode = EX_OSERR;

1339

goto end;

1340

}

1341

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1342

if(ret == -1){

1343

perror("sigaddset");

1344

exitcode = EX_OSERR;

1345

goto end;

1346

}

1347

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1348

if(ret == -1){

1349

perror("sigaddset");

1350

exitcode = EX_OSERR;

1351

goto end;

1352

}

1353

/* Need to check if the handler is SIG_IGN before handling:

1354

| [[info:libc:Initial Signal Actions]] |

1355

| [[info:libc:Basic Signal Handling]] |

1356

*/

1357

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1358

if(ret == -1){

1359

perror("sigaction");

1360

return EX_OSERR;

1361

}

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

ret = sigaction(SIGINT, &sigterm_action, NULL);

1364

if(ret == -1){

1365

perror("sigaction");

1366

exitcode = EX_OSERR;

1367

goto end;

1368

}

1369

}

1370

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1371

if(ret == -1){

1372

perror("sigaction");

1373

return EX_OSERR;

1374

}

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1377

if(ret == -1){

1378

perror("sigaction");

1379

exitcode = EX_OSERR;

1380

goto end;

1381

}

1382

}

1383

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1384

if(ret == -1){

1385

perror("sigaction");

1386

return EX_OSERR;

1387

}

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1390

if(ret == -1){

1391

perror("sigaction");

1392

exitcode = EX_OSERR;

1393

goto end;

1394

}

1395

}

1396

995

1397

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

996

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

1398

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

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

if(if_index == 0){

1401

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

1402

exitcode = EX_UNAVAILABLE;

1403

goto end;

1404

}

1405

1406

if(quit_now){

1407

goto end;

1408

}

1409

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

997

1417

#ifdef __linux__

998

1418

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

999

messages to mess up the prompt */

1419

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

1000

1420

ret = klogctl(8, NULL, 5);

1001

1421

bool restore_loglevel = true;

1002

1422

if(ret == -1){

1003

1423

restore_loglevel = false;

1004

1424

perror("klogctl");

1005

1425

}

1006

#endif

1426

#endif /* __linux__ */

1007

1427

1008

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1009

1429

if(sd < 0){

1010

1430

perror("socket");

1011

exitcode = EXIT_FAILURE;

1431

exitcode = EX_OSERR;

1012

1432

#ifdef __linux__

1013

1433

if(restore_loglevel){

1014

1434

ret = klogctl(7, NULL, 0);

1016

1436

perror("klogctl");

1017

1437

}

1018

1438

}

1019

#endif

1439

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1020

1446

goto end;

1021

1447

}

1022

1448

strcpy(network.ifr_name, interface);

1030

1456

perror("klogctl");

1031

1457

}

1032

1458

}

1033

#endif

1034

exitcode = EXIT_FAILURE;

1459

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1035

1467

goto end;

1036

1468

}

1037

1469

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

1038

1470

network.ifr_flags |= IFF_UP;

1471

take_down_interface = true;

1039

1472

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

1040

1473

if(ret == -1){

1041

perror("ioctl SIOCSIFFLAGS");

1042

exitcode = EXIT_FAILURE;

1474

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1043

1477

#ifdef __linux__

1044

1478

if(restore_loglevel){

1045

1479

ret = klogctl(7, NULL, 0);

1047

1481

perror("klogctl");

1048

1482

}

1049

1483

}

1050

#endif

1484

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1051

1491

goto end;

1052

1492

}

1053

1493

}

1065

1505

perror("nanosleep");

1066

1506

}

1067

1507

}

1068

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

1069

if(ret == -1){

1070

perror("close");

1508

if(not take_down_interface){

1509

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

1510

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

1511

if(ret == -1){

1512

perror("close");

1513

}

1071

1514

}

1072

1515

#ifdef __linux__

1073

1516

if(restore_loglevel){

1077

1520

perror("klogctl");

1078

1521

}

1079

1522

}

1080

#endif

1081

}

1082

1083

uid = getuid();

1084

gid = getgid();

1085

1086

errno = 0;

1087

setgid(gid);

1088

if(ret == -1){

1089

perror("setgid");

1090

}

1091

1092

ret = setuid(uid);

1093

if(ret == -1){

1094

perror("setuid");

1095

}

1096

1097

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

1523

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

1539

}

1540

1541

if(quit_now){

1542

goto end;

1543

}

1544

1545

ret = init_gnutls_global(pubkey, seckey);

1098

1546

if(ret == -1){

1099

1547

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

1100

exitcode = EXIT_FAILURE;

1548

exitcode = EX_UNAVAILABLE;

1101

1549

goto end;

1102

1550

} else {

1103

1551

gnutls_initialized = true;

1104

1552

}

1105

1553

1554

if(quit_now){

1555

goto end;

1556

}

1557

1558

tempdir_created = true;

1106

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1107

1561

perror("mkdtemp");

1108

1562

goto end;

1109

1563

}

1110

tempdir_created = true;

1111

1112

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

1564

1565

if(quit_now){

1566

goto end;

1567

}

1568

1569

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

1113

1570

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

1114

exitcode = EXIT_FAILURE;

1571

exitcode = EX_UNAVAILABLE;

1115

1572

goto end;

1116

1573

} else {

1117

1574

gpgme_initialized = true;

1118

1575

}

1119

1576

1120

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

1121

if_index = (AvahiIfIndex) if_nametoindex(interface);

1122

if(if_index == 0){

1123

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

1124

exitcode = EXIT_FAILURE;

1125

goto end;

1126

}

1577

if(quit_now){

1578

goto end;

1127

1579

}

1128

1580

1129

1581

if(connect_to != NULL){

1132

1584

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

1133

1585

if(address == NULL){

1134

1586

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

1135

exitcode = EXIT_FAILURE;

1136

goto end;

1137

}

1587

exitcode = EX_USAGE;

1588

goto end;

1589

}

1590

1591

if(quit_now){

1592

goto end;

1593

}

1594

1138

1595

uint16_t port;

1139

ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);

1140

if(ret < 1 or tmpmax != (uint16_t)tmpmax

1141

or address[numchars+1] != '\0'){

1596

errno = 0;

1597

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

1598

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

1599

or tmpmax != (uint16_t)tmpmax){

1142

1600

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

1143

exitcode = EXIT_FAILURE;

1144

goto end;

1145

}

1601

exitcode = EX_USAGE;

1602

goto end;

1603

}

1604

1605

if(quit_now){

1606

goto end;

1607

}

1608

1146

1609

port = (uint16_t)tmpmax;

1147

1610

*address = '\0';

1148

1611

address = connect_to;

1153

1616

} else {

1154

1617

af = AF_INET;

1155

1618

}

1156

ret = start_mandos_communication(address, port, if_index, &mc,

1157

af);

1158

if(ret < 0){

1159

exitcode = EXIT_FAILURE;

1160

} else {

1619

1620

if(quit_now){

1621

goto end;

1622

}

1623

1624

while(not quit_now){

1625

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

1626

if(quit_now or ret == 0){

1627

break;

1628

}

1629

sleep(15);

1630

};

1631

1632

if (not quit_now){

1161

1633

exitcode = EXIT_SUCCESS;

1162

1634

}

1635

1163

1636

goto end;

1164

1637

}

1165

1638

1166

if(not debug){

1167

avahi_set_log_function(empty_log);

1168

}

1169

1170

/* Initialize the pseudo-RNG for Avahi */

1171

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

1172

1173

/* Allocate main Avahi loop object */

1174

mc.simple_poll = avahi_simple_poll_new();

1175

if(mc.simple_poll == NULL){

1176

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1177

exitcode = EXIT_FAILURE;

1639

if(quit_now){

1178

1640

goto end;

1179

1641

}

1180

1642

1200

1662

if(mc.server == NULL){

1201

1663

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

1202

1664

avahi_strerror(error));

1203

exitcode = EXIT_FAILURE;

1665

exitcode = EX_UNAVAILABLE;

1666

goto end;

1667

}

1668

1669

if(quit_now){

1204

1670

goto end;

1205

1671

}

1206

1672

1207

1673

/* Create the Avahi service browser */

1208

1674

sb = avahi_s_service_browser_new(mc.server, if_index,

1209

AVAHI_PROTO_INET6, "_mandos._tcp",

1210

NULL, 0, browse_callback, &mc);

1675

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1676

NULL, 0, browse_callback, NULL);

1211

1677

if(sb == NULL){

1212

1678

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

1213

1679

avahi_strerror(avahi_server_errno(mc.server)));

1214

exitcode = EXIT_FAILURE;

1680

exitcode = EX_UNAVAILABLE;

1681

goto end;

1682

}

1683

1684

if(quit_now){

1215

1685

goto end;

1216

1686

}

1217

1687

1249

1719

gpgme_release(mc.ctx);

1250

1720

}

1251

1721

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

1729

}

1730

if(geteuid() == 0){

1731

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

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

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

1736

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

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1739

}

1740

}

1741

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

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

1750

}

1751

}

1752

}

1753

1252

1754

/* Removes the temp directory used by GPGME */

1253

1755

if(tempdir_created){

1254

1756

DIR *d;

1293

1795

}

1294

1796

}

1295

1797

1798

if(quit_now){

1799

sigemptyset(&old_sigterm_action.sa_mask);

1800

old_sigterm_action.sa_handler = SIG_DFL;

1801

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1802

&old_sigterm_action,

1803

NULL));

1804

if(ret == -1){

1805

perror("sigaction");

1806

}

1807

do {

1808

ret = raise(signal_received);

1809

} while(ret != 0 and errno == EINTR);

1810

if(ret != 0){

1811

perror("raise");

1812

abort();

1813

}

1814

TEMP_FAILURE_RETRY(pause());

1815

}

1816

1296

1817

return exitcode;

1297

1818

}