/mandos/trunk : revision 276

1

/* -*- coding: utf-8 -*- */

2

/*

3

* Mandos client - get and decrypt data from a Mandos server

3

* Mandos-client - get and decrypt data from a Mandos server

4

*

5

* This program is partly derived from an example program for an Avahi

6

* service browser, downloaded from

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

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*

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* Everything else is

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13

14

*

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15

* This program is free software: you can redistribute it and/or

15

16

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

35

36

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

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37

38

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

38

stdout, ferror() */

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stdout, ferror(), sscanf */

39

40

#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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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

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sockaddr_in6, PF_INET6,

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SOCK_STREAM, INET6_ADDRSTRLEN,

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uid_t, gid_t, open(), opendir(), DIR */

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uid_t, gid_t, open(), opendir(),

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DIR */

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

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

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struct in6_addr, inet_pton(),

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connect() */

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

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

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#include <inttypes.h> /* PRIu16 */

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#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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61

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

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62

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

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63

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

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

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setgid() */

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

69

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

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

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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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75

argp_parse(), ARGP_KEY_ARG,

89

92

gnutls_*

90

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init_gnutls_session(),

91

94

GNUTLS_* */

92

#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),

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#include <gnutls/openpgp.h>

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/* gnutls_certificate_set_openpgp_key_file(),

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GNUTLS_OPENPGP_FMT_BASE64 */

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98

95

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/* GPGME */

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105

102

106

#define BUFFER_SIZE 256

103

107

104

/*

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#define PATHDIR "/conf/conf.d/mandos"

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*/

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108

#define PATHDIR "/conf/conf.d/mandos"

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#define SECKEY "seckey.txt"

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#define PUBKEY "pupkey.txt"

110

#define PUBKEY "pubkey.txt"

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112

bool debug = false;

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static const char mandos_protocol_version[] = "1";

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const char *argp_program_version = "password-request 1.0";

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

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

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117

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

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*/

133

size_t adjustbuffer(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){

135

if(buffer_length + BUFFER_SIZE > buffer_capacity){

136

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

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if (buffer == NULL){

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if(buffer == NULL){

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return 0;

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}

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buffer_capacity += BUFFER_SIZE;

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int ret;

151

gpgme_error_t rc;

152

gpgme_engine_info_t engine_info;

153

154

155

/*

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

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int fd;

160

gpgme_data_t pgp_data;

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162

fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

162

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

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if(fd == -1){

164

perror("open");

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return false;

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}

167

168

rc = gpgme_data_new_from_fd(&pgp_data, fd);

169

if (rc != GPG_ERR_NO_ERROR){

169

if(rc != GPG_ERR_NO_ERROR){

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

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gpgme_strsource(rc), gpgme_strerror(rc));

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return false;

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}

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

176

if (rc != GPG_ERR_NO_ERROR){

176

if(rc != GPG_ERR_NO_ERROR){

177

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

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gpgme_strsource(rc), gpgme_strerror(rc));

179

return false;

180

}

181

182

ret = TEMP_FAILURE_RETRY(close(fd));

181

182

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

183

if(ret == -1){

184

perror("close");

185

}

187

return true;

188

}

189

190

if (debug){

190

if(debug){

191

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

192

}

193

194

/* Init GPGME */

195

gpgme_check_version(NULL);

196

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

197

if (rc != GPG_ERR_NO_ERROR){

197

if(rc != GPG_ERR_NO_ERROR){

198

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

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gpgme_strsource(rc), gpgme_strerror(rc));

200

return false;

201

}

202

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/* Set GPGME home directory for the OpenPGP engine only */

204

rc = gpgme_get_engine_info (&engine_info);

205

if (rc != GPG_ERR_NO_ERROR){

204

rc = gpgme_get_engine_info(&engine_info);

205

if(rc != GPG_ERR_NO_ERROR){

206

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

207

gpgme_strsource(rc), gpgme_strerror(rc));

208

return false;

219

fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

220

return false;

221

}

222

223

/* Create new GPGME "context" */

224

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

225

if (rc != GPG_ERR_NO_ERROR){

225

if(rc != GPG_ERR_NO_ERROR){

226

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

227

gpgme_strsource(rc), gpgme_strerror(rc));

228

return false;

229

}

230

231

if (not import_key(pubkey) or not import_key(seckey)){

231

if(not import_key(pubkey) or not import_key(seckey)){

232

return false;

233

}

234

239

* Decrypt OpenPGP data.

240

* Returns -1 on error

241

*/

242

static ssize_t pgp_packet_decrypt (const mandos_context *mc,

243

const char *cryptotext,

244

size_t crypto_size,

245

char **plaintext){

242

static ssize_t pgp_packet_decrypt(const mandos_context *mc,

243

const char *cryptotext,

244

size_t crypto_size,

245

char **plaintext){

246

gpgme_data_t dh_crypto, dh_plain;

247

gpgme_error_t rc;

248

ssize_t ret;

249

size_t plaintext_capacity = 0;

250

ssize_t plaintext_length = 0;

251

252

if (debug){

252

if(debug){

253

fprintf(stderr, "Trying to decrypt OpenPGP data\n");

254

}

255

256

/* Create new GPGME data buffer from memory cryptotext */

257

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

258

0);

259

if (rc != GPG_ERR_NO_ERROR){

259

if(rc != GPG_ERR_NO_ERROR){

260

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

261

gpgme_strsource(rc), gpgme_strerror(rc));

262

return -1;

264

265

/* Create new empty GPGME data buffer for the plaintext */

266

rc = gpgme_data_new(&dh_plain);

267

if (rc != GPG_ERR_NO_ERROR){

267

if(rc != GPG_ERR_NO_ERROR){

268

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

269

gpgme_strsource(rc), gpgme_strerror(rc));

270

gpgme_data_release(dh_crypto);

274

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

275

data buffer */

276

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

277

if (rc != GPG_ERR_NO_ERROR){

277

if(rc != GPG_ERR_NO_ERROR){

278

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

279

gpgme_strsource(rc), gpgme_strerror(rc));

280

plaintext_length = -1;

281

if (debug){

281

if(debug){

282

gpgme_decrypt_result_t result;

283

result = gpgme_op_decrypt_result(mc->ctx);

284

if (result == NULL){

284

if(result == NULL){

285

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

286

} else {

287

fprintf(stderr, "Unsupported algorithm: %s\n",

314

}

315

316

/* Seek back to the beginning of the GPGME plaintext data buffer */

317

if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){

318

perror("pgpme_data_seek");

317

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

318

perror("gpgme_data_seek");

319

plaintext_length = -1;

320

goto decrypt_end;

321

}

325

plaintext_capacity = adjustbuffer(plaintext,

326

(size_t)plaintext_length,

327

plaintext_capacity);

328

if (plaintext_capacity == 0){

328

if(plaintext_capacity == 0){

329

perror("adjustbuffer");

330

plaintext_length = -1;

331

goto decrypt_end;

334

ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,

335

BUFFER_SIZE);

336

/* Print the data, if any */

337

if (ret == 0){

337

if(ret == 0){

338

/* EOF */

339

break;

340

}

364

return plaintext_length;

365

}

366

367

static const char * safer_gnutls_strerror (int value) {

368

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

369

if (ret == NULL)

367

static const char * safer_gnutls_strerror(int value) {

368

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

369

-Wunreachable-code */

370

if(ret == NULL)

370

371

ret = "(unknown)";

371

372

return ret;

372

373

}

387

388

}

388

389

390

ret = gnutls_global_init();

390

if (ret != GNUTLS_E_SUCCESS) {

391

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

392

safer_gnutls_strerror(ret));

391

if(ret != GNUTLS_E_SUCCESS) {

392

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

393

safer_gnutls_strerror(ret));

393

394

return -1;

394

395

}

395

396

if (debug){

397

if(debug){

397

398

/* "Use a log level over 10 to enable all debugging options."

398

399

* - GnuTLS manual

399

400

*/

403

404

405

/* OpenPGP credentials */

405

406

gnutls_certificate_allocate_credentials(&mc->cred);

406

if (ret != GNUTLS_E_SUCCESS){

407

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

408

warning */

409

safer_gnutls_strerror(ret));

410

gnutls_global_deinit ();

407

if(ret != GNUTLS_E_SUCCESS){

408

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

409

* from

410

* -Wunreachable-code

411

*/

412

safer_gnutls_strerror(ret));

413

gnutls_global_deinit();

411

414

return -1;

412

415

}

413

416

420

423

ret = gnutls_certificate_set_openpgp_key_file

421

424

(mc->cred, pubkeyfilename, seckeyfilename,

422

425

GNUTLS_OPENPGP_FMT_BASE64);

423

if (ret != GNUTLS_E_SUCCESS) {

426

if(ret != GNUTLS_E_SUCCESS) {

424

427

fprintf(stderr,

425

428

"Error[%d] while reading the OpenPGP key pair ('%s',"

426

429

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

431

434

432

435

/* GnuTLS server initialization */

433

436

ret = gnutls_dh_params_init(&mc->dh_params);

434

if (ret != GNUTLS_E_SUCCESS) {

435

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

436

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

437

if(ret != GNUTLS_E_SUCCESS) {

438

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

439

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

437

440

goto globalfail;

438

441

}

439

442

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

440

if (ret != GNUTLS_E_SUCCESS) {

441

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

442

safer_gnutls_strerror(ret));

443

if(ret != GNUTLS_E_SUCCESS) {

444

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

445

safer_gnutls_strerror(ret));

443

446

goto globalfail;

444

447

}

445

448

451

454

452

455

gnutls_certificate_free_credentials(mc->cred);

453

456

gnutls_global_deinit();

457

gnutls_dh_params_deinit(mc->dh_params);

454

458

return -1;

455

459

}

456

460

459

463

int ret;

460

464

/* GnuTLS session creation */

461

465

ret = gnutls_init(session, GNUTLS_SERVER);

462

if (ret != GNUTLS_E_SUCCESS){

466

if(ret != GNUTLS_E_SUCCESS){

463

467

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

464

468

safer_gnutls_strerror(ret));

465

469

}

467

471

{

468

472

const char *err;

469

473

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

470

if (ret != GNUTLS_E_SUCCESS) {

474

if(ret != GNUTLS_E_SUCCESS) {

471

475

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

472

476

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

473

477

safer_gnutls_strerror(ret));

474

gnutls_deinit (*session);

478

gnutls_deinit(*session);

475

479

return -1;

476

480

}

477

481

}

478

482

479

483

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

480

484

mc->cred);

481

if (ret != GNUTLS_E_SUCCESS) {

485

if(ret != GNUTLS_E_SUCCESS) {

482

486

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

483

487

safer_gnutls_strerror(ret));

484

gnutls_deinit (*session);

488

gnutls_deinit(*session);

485

489

return -1;

486

490

}

487

491

488

492

/* ignore client certificate if any. */

489

gnutls_certificate_server_set_request (*session,

490

GNUTLS_CERT_IGNORE);

493

gnutls_certificate_server_set_request(*session,

494

GNUTLS_CERT_IGNORE);

491

495

492

gnutls_dh_set_prime_bits (*session, mc->dh_bits);

496

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

493

497

494

498

return 0;

495

499

}

503

507

AvahiIfIndex if_index,

504

508

mandos_context *mc){

505

509

int ret, tcp_sd;

510

ssize_t sret;

506

511

union { struct sockaddr in; struct sockaddr_in6 in6; } to;

507

512

char *buffer = NULL;

508

513

char *decrypted_buffer;

514

519

char interface[IF_NAMESIZE];

515

520

gnutls_session_t session;

516

521

517

ret = init_gnutls_session (mc, &session);

518

if (ret != 0){

522

ret = init_gnutls_session(mc, &session);

523

if(ret != 0){

519

524

return -1;

520

525

}

521

526

543

548

/* It would be nice to have a way to detect if we were passed an

544

549

IPv4 address here. Now we assume an IPv6 address. */

545

550

ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);

546

if (ret < 0 ){

551

if(ret < 0 ){

547

552

perror("inet_pton");

548

553

return -1;

549

554

}

551

556

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

552

557

return -1;

553

558

}

554

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

559

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

560

-Wconversion and

561

-Wunreachable-code */

555

562

556

563

to.in6.sin6_scope_id = (uint32_t)if_index;

557

564

570

577

}

571

578

572

579

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

573

if (ret < 0){

580

if(ret < 0){

574

581

perror("connect");

575

582

return -1;

576

583

}

577

584

578

585

const char *out = mandos_protocol_version;

579

586

written = 0;

580

while (true){

587

while(true){

581

588

size_t out_size = strlen(out);

582

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

589

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

583

590

out_size - written));

584

if (ret == -1){

591

if(ret == -1){

585

592

perror("write");

586

593

retval = -1;

587

594

goto mandos_end;

590

597

if(written < out_size){

591

598

continue;

592

599

} else {

593

if (out == mandos_protocol_version){

600

if(out == mandos_protocol_version){

594

601

written = 0;

595

602

out = "\r\n";

596

603

} else {

603

610

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

604

611

}

605

612

606

gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);

613

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

607

614

608

615

do{

609

ret = gnutls_handshake (session);

616

ret = gnutls_handshake(session);

610

617

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

611

618

612

if (ret != GNUTLS_E_SUCCESS){

619

if(ret != GNUTLS_E_SUCCESS){

613

620

if(debug){

614

621

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

615

gnutls_perror (ret);

622

gnutls_perror(ret);

616

623

}

617

624

retval = -1;

618

625

goto mandos_end;

628

635

while(true){

629

636

buffer_capacity = adjustbuffer(&buffer, buffer_length,

630

637

buffer_capacity);

631

if (buffer_capacity == 0){

638

if(buffer_capacity == 0){

632

639

perror("adjustbuffer");

633

640

retval = -1;

634

641

goto mandos_end;

635

642

}

636

643

637

ret = gnutls_record_recv(session, buffer+buffer_length,

638

BUFFER_SIZE);

639

if (ret == 0){

644

sret = gnutls_record_recv(session, buffer+buffer_length,

645

BUFFER_SIZE);

646

if(sret == 0){

640

647

break;

641

648

}

642

if (ret < 0){

643

switch(ret){

649

if(sret < 0){

650

switch(sret){

644

651

case GNUTLS_E_INTERRUPTED:

645

652

case GNUTLS_E_AGAIN:

646

653

break;

647

654

case GNUTLS_E_REHANDSHAKE:

648

655

do{

649

ret = gnutls_handshake (session);

656

ret = gnutls_handshake(session);

650

657

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

651

if (ret < 0){

658

if(ret < 0){

652

659

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

653

gnutls_perror (ret);

660

gnutls_perror(ret);

654

661

retval = -1;

655

662

goto mandos_end;

656

663

}

659

666

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

660

667

" encrypted session with Mandos server\n");

661

668

retval = -1;

662

gnutls_bye (session, GNUTLS_SHUT_RDWR);

669

gnutls_bye(session, GNUTLS_SHUT_RDWR);

663

670

goto mandos_end;

664

671

}

665

672

} else {

666

buffer_length += (size_t) ret;

673

buffer_length += (size_t) sret;

667

674

}

668

675

}

669

676

671

678

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

672

679

}

673

680

674

gnutls_bye (session, GNUTLS_SHUT_RDWR);

681

gnutls_bye(session, GNUTLS_SHUT_RDWR);

675

682

676

if (buffer_length > 0){

683

if(buffer_length > 0){

677

684

decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,

678

685

buffer_length,

679

686

&decrypted_buffer);

680

if (decrypted_buffer_size >= 0){

687

if(decrypted_buffer_size >= 0){

681

688

written = 0;

682

689

while(written < (size_t) decrypted_buffer_size){

683

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

684

(size_t)decrypted_buffer_size - written,

685

stdout);

690

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

691

(size_t)decrypted_buffer_size - written,

692

stdout);

686

693

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

687

694

if(debug){

688

695

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

705

712

706

713

mandos_end:

707

714

free(buffer);

708

ret = TEMP_FAILURE_RETRY(close(tcp_sd));

715

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

709

716

if(ret == -1){

710

717

perror("close");

711

718

}

712

gnutls_deinit (session);

719

gnutls_deinit(session);

713

720

return retval;

714

721

}

715

722

733

740

/* Called whenever a service has been resolved successfully or

734

741

timed out */

735

742

736

switch (event) {

743

switch(event) {

737

744

default:

738

745

case AVAHI_RESOLVER_FAILURE:

739

746

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

747

754

avahi_address_snprint(ip, sizeof(ip), address);

748

755

if(debug){

749

756

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

750

PRIu16 ") on port %d\n", name, host_name, ip,

751

interface, port);

757

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

758

ip, (intmax_t)interface, port);

752

759

}

753

760

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

754

if (ret == 0){

761

if(ret == 0){

755

762

avahi_simple_poll_quit(mc->simple_poll);

756

763

}

757

764

}

775

782

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

776

783

is removed from the LAN */

777

784

778

switch (event) {

785

switch(event) {

779

786

default:

780

787

case AVAHI_BROWSER_FAILURE:

781

788

790

797

the callback function is called the Avahi server will free the

791

798

resolver for us. */

792

799

793

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

800

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

794

801

protocol, name, type, domain,

795

802

AVAHI_PROTO_INET6, 0,

796

803

resolve_callback, mc)))

814

821

AvahiSServiceBrowser *sb = NULL;

815

822

int error;

816

823

int ret;

824

intmax_t tmpmax;

825

int numchars;

817

826

int exitcode = EXIT_SUCCESS;

818

827

const char *interface = "eth0";

819

828

struct ifreq network;

830

839

.dh_bits = 1024, .priority = "SECURE256"

831

840

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

832

841

bool gnutls_initalized = false;

833

bool pgpme_initalized = false;

842

bool gpgme_initalized = false;

834

843

835

844

{

836

845

struct argp_option options[] = {

865

874

{ .name = NULL }

866

875

};

867

876

868

error_t parse_opt (int key, char *arg,

869

struct argp_state *state) {

870

/* Get the INPUT argument from `argp_parse', which we know is

871

a pointer to our plugin list pointer. */

872

switch (key) {

877

error_t parse_opt(int key, char *arg,

878

struct argp_state *state) {

879

switch(key) {

873

880

case 128: /* --debug */

874

881

debug = true;

875

882

break;

886

893

pubkey = arg;

887

894

break;

888

895

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

889

errno = 0;

890

mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);

891

if (errno){

892

perror("strtol");

896

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

897

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

898

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

899

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

893

900

exit(EXIT_FAILURE);

894

901

}

902

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

895

903

break;

896

904

case 130: /* --priority */

897

905

mc.priority = arg;

898

906

break;

899

907

case ARGP_KEY_ARG:

900

argp_usage (state);

908

argp_usage(state);

901

909

case ARGP_KEY_END:

902

910

break;

903

911

default:

910

918

.args_doc = "",

911

919

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

912

920

" passwords from a Mandos server" };

913

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

914

if (ret == ARGP_ERR_UNKNOWN){

921

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

922

if(ret == ARGP_ERR_UNKNOWN){

915

923

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

916

924

exitcode = EXIT_FAILURE;

917

925

goto end;

918

926

}

919

927

}

920

928

921

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

922

if (ret == -1){

923

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

924

exitcode = EXIT_FAILURE;

925

goto end;

926

} else {

927

gnutls_initalized = true;

928

}

929

930

if(mkdtemp(tempdir) == NULL){

931

perror("mkdtemp");

932

tempdir[0] = '\0';

933

goto end;

934

}

935

936

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

937

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

938

exitcode = EXIT_FAILURE;

939

goto end;

940

} else {

941

pgpme_initalized = true;

942

}

943

944

929

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

945

930

{

946

931

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

965

950

goto end;

966

951

}

967

952

}

968

ret = TEMP_FAILURE_RETRY(close(sd));

953

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

969

954

if(ret == -1){

970

955

perror("close");

971

956

}

975

960

gid = getgid();

976

961

977

962

ret = setuid(uid);

978

if (ret == -1){

963

if(ret == -1){

979

964

perror("setuid");

980

965

}

981

966

982

967

setgid(gid);

983

if (ret == -1){

968

if(ret == -1){

984

969

perror("setgid");

985

970

}

986

971

972

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

973

if(ret == -1){

974

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

975

exitcode = EXIT_FAILURE;

976

goto end;

977

} else {

978

gnutls_initalized = true;

979

}

980

981

if(mkdtemp(tempdir) == NULL){

982

perror("mkdtemp");

983

tempdir[0] = '\0';

984

goto end;

985

}

986

987

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

988

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

989

exitcode = EXIT_FAILURE;

990

goto end;

991

} else {

992

gpgme_initalized = true;

993

}

994

987

995

if_index = (AvahiIfIndex) if_nametoindex(interface);

988

996

if(if_index == 0){

989

997

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

999

1007

exitcode = EXIT_FAILURE;

1000

1008

goto end;

1001

1009

}

1002

errno = 0;

1003

uint16_t port = (uint16_t) strtol(address+1, NULL, 10);

1004

if(errno){

1005

perror("Bad port number");

1010

uint16_t port;

1011

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

1012

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

1013

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

1014

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

1006

1015

exitcode = EXIT_FAILURE;

1007

1016

goto end;

1008

1017

}

1018

port = (uint16_t)tmpmax;

1009

1019

*address = '\0';

1010

1020

address = connect_to;

1011

1021

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

1017

1027

goto end;

1018

1028

}

1019

1029

1020

if (not debug){

1030

if(not debug){

1021

1031

avahi_set_log_function(empty_log);

1022

1032

}

1023

1033

1026

1036

1027

1037

/* Allocate main Avahi loop object */

1028

1038

mc.simple_poll = avahi_simple_poll_new();

1029

if (mc.simple_poll == NULL) {

1039

if(mc.simple_poll == NULL) {

1030

1040

fprintf(stderr, "Avahi: Failed to create simple poll"

1031

1041

" object.\n");

1032

1042

exitcode = EXIT_FAILURE;

1052

1062

}

1053

1063

1054

1064

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

1055

if (mc.server == NULL) {

1065

if(mc.server == NULL) {

1056

1066

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

1057

1067

avahi_strerror(error));

1058

1068

exitcode = EXIT_FAILURE;

1064

1074

AVAHI_PROTO_INET6,

1065

1075

"_mandos._tcp", NULL, 0,

1066

1076

browse_callback, &mc);

1067

if (sb == NULL) {

1077

if(sb == NULL) {

1068

1078

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

1069

1079

avahi_strerror(avahi_server_errno(mc.server)));

1070

1080

exitcode = EXIT_FAILURE;

1073

1083

1074

1084

/* Run the main loop */

1075

1085

1076

if (debug){

1086

if(debug){

1077

1087

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

1078

1088

}

1079

1089

1081

1091

1082

1092

end:

1083

1093

1084

if (debug){

1094

if(debug){

1085

1095

fprintf(stderr, "%s exiting\n", argv[0]);

1086

1096

}

1087

1097

1088

1098

/* Cleanup things */

1089

if (sb != NULL)

1099

if(sb != NULL)

1090

1100

avahi_s_service_browser_free(sb);

1091

1101

1092

if (mc.server != NULL)

1102

if(mc.server != NULL)

1093

1103

avahi_server_free(mc.server);

1094

1104

1095

if (mc.simple_poll != NULL)

1105

if(mc.simple_poll != NULL)

1096

1106

avahi_simple_poll_free(mc.simple_poll);

1097

1107

1098

if (gnutls_initalized){

1108

if(gnutls_initalized){

1099

1109

gnutls_certificate_free_credentials(mc.cred);

1100

gnutls_global_deinit ();

1110

gnutls_global_deinit();

1111

gnutls_dh_params_deinit(mc.dh_params);

1101

1112

}

1102

1103

if(pgpme_initalized){

1113

1114

if(gpgme_initalized){

1104

1115

gpgme_release(mc.ctx);

1105

1116

}

1106

1117

1107

1118

/* Removes the temp directory used by GPGME */

1108

1119

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

1109

1120

DIR *d;

1110

1121

struct dirent *direntry;

1111

1122

d = opendir(tempdir);

1112

1123

if(d == NULL){

1113

perror("opendir");

1124

if(errno != ENOENT){

1125

perror("opendir");

1126

}

1114

1127

} else {

1115

1128

while(true){

1116

1129

direntry = readdir(d);

1117

1130

if(direntry == NULL){

1118

1131

break;

1119

1132

}

1120

if (direntry->d_type == DT_REG){

1133

if(direntry->d_type == DT_REG){

1121

1134

char *fullname = NULL;

1122

1135

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

1123

1136

direntry->d_name);

1133

1146

free(fullname);

1134

1147

}

1135

1148

}

1149

closedir(d);

1136

1150

}

1137

1151

ret = rmdir(tempdir);

1138

if(ret == -1){

1152

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

1139

1153

perror("rmdir");

1140

1154

}

1141

1155

}